fix

book/node_modules/nunjucks/LICENSE

@@ -0,0 +1,26 @@
+Copyright (c) 2012-2015, James Long
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+
+    Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in
+    the documentation and/or other materials provided with the
+    distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

book/node_modules/nunjucks/README.md

@@ -0,0 +1,58 @@
+# Nunjucks
+
+[![NPM Version][npm-image]][npm-url]
+[![NPM Downloads][downloads-image]][downloads-url]
+[![Linux Build][github-actions-image]][github-actions-url]
+[![Windows Build][appveyor-image]][appveyor-url]
+[![Test Codecov][codecov-image]][codecov-url]
+
+[Nunjucks](https://mozilla.github.io/nunjucks/) is a full featured
+templating engine for javascript. It is heavily inspired by
+[jinja2](http://jinja.pocoo.org/). View the docs
+[here](https://mozilla.github.io/nunjucks/).
+
+## Installation
+
+`npm install nunjucks`
+
+To use the file watcher built-in to Nunjucks, Chokidar must be installed separately.
+
+`npm install nunjucks chokidar`
+
+(View the [CHANGELOG](https://github.com/mozilla/nunjucks/releases))
+
+## Documentation
+
+See [here](https://mozilla.github.io/nunjucks/).
+
+## Browser Support
+
+Supported in all modern browsers. For IE8 support, use [es5-shim](https://github.com/es-shims/es5-shim).
+
+## Tests
+
+Run the tests with `npm test`.
+
+Watch `master` branch's [tests running in the browser](https://mozilla.github.io/nunjucks/files/tests/browser/).
+
+## Mailing List
+
+Join our mailing list and get help with and issues you have:
+https://groups.google.com/forum/?fromgroups#!forum/nunjucks
+
+## Want to help?
+
+Contributions are always welcome! Before you submit an issue or pull request, please read our [contribution guidelines](CONTRIBUTING.md).
+
+[Contributors](https://github.com/mozilla/nunjucks/graphs/contributors)
+
+[npm-image]: https://img.shields.io/npm/v/nunjucks.svg
+[npm-url]: https://npmjs.org/package/nunjucks
+[downloads-image]: https://img.shields.io/npm/dm/nunjucks.svg
+[downloads-url]: https://npmjs.org/package/nunjucks
+[github-actions-image]: https://img.shields.io/github/workflow/status/mozilla/nunjucks/Tests/master.svg?label=linux
+[github-actions-url]: https://github.com/mozilla/nunjucks/actions
+[appveyor-image]: https://img.shields.io/appveyor/ci/fdintino/nunjucks/master.svg?label=windows
+[appveyor-url]: https://ci.appveyor.com/project/fdintino/nunjucks
+[codecov-image]: https://img.shields.io/codecov/c/gh/mozilla/nunjucks.svg
+[codecov-url]: https://codecov.io/gh/mozilla/nunjucks/branch/master

book/node_modules/nunjucks/bin/precompile

@@ -0,0 +1,58 @@
+#!/usr/bin/env node
+var {program} = require('commander');
+var precompile = require('../src/precompile').precompile;
+var Environment = require('../src/environment').Environment;
+var lib = require('../src/lib');
+
+var cmdpath = null;
+
+program
+  .storeOptionsAsProperties(false)
+  .passCommandToAction(false);
+
+program
+  .name('precompile')
+  .usage('[-f|--force] [-a|--filters <filters>] [-n|--name <name>] [-i|--include <regex>] [-x|--exclude <regex>] [-w|--wrapper <wrapper>] <path>')
+  .arguments('<path>')
+  .helpOption('-?, -h, --help', 'Display this help message')
+  .option('-f, --force', 'Force compilation to continue on error')
+  .option('-a, --filters <filters>', 'Give the compiler a comma-delimited list of asynchronous filters, required for correctly generating code')
+  .option('-n, --name <name>', 'Specify the template name when compiling a single file')
+  .option('-i, --include <regex>', 'Include a file or folder which match the regex but would otherwise be excluded. You can use this flag multiple times', concat, ['\\.html$', '\\.jinja$'])
+  .option('-x, --exclude <regex>', 'Exclude a file or folder which match the regex but would otherwise be included. You can use this flag multiple times', concat, [])
+  .option('-w, --wrapper <wrapper>', 'Load a external plugin to change the output format of the precompiled templates (for example, "-w custom" will load a module named "nunjucks-custom")')
+  .action(function (path) {
+    cmdpath = path;
+  })
+  .parse(process.argv);
+
+function concat(value, previous) {
+  return previous.concat(value);
+}
+
+if (cmdpath == null) {
+  program.outputHelp();
+  console.error('\nerror: no path given');
+  process.exit(1);
+}
+
+var env = new Environment([]);
+
+const opts = program.opts();
+
+lib.each([].concat(opts.filters).join(',').split(','), function (name) {
+  env.addFilter(name.trim(), function () {}, true);
+});
+
+if (opts.wrapper) {
+  opts.wrapper = require('nunjucks-' + opts.wrapper).wrapper;
+}
+
+console.log(precompile(cmdpath, {
+  env : env,
+  force : opts.force,
+  name : opts.name,
+  wrapper: opts.wrapper,
+  include : [].concat(opts.include),
+  exclude : [].concat(opts.exclude)
+}));

book/node_modules/nunjucks/bin/precompile.cmd

@@ -0,0 +1,5 @@
+@IF EXIST "%~dp0\node.exe" (
+  "%~dp0\node.exe"  "%~dp0\precompile" %*
+) ELSE (
+  node  "%~dp0\precompile" %*
+)

book/node_modules/nunjucks/index.js

@@ -0,0 +1,82 @@
+'use strict';
+
+var lib = require('./src/lib');
+var _require = require('./src/environment'),
+  Environment = _require.Environment,
+  Template = _require.Template;
+var Loader = require('./src/loader');
+var loaders = require('./src/loaders');
+var precompile = require('./src/precompile');
+var compiler = require('./src/compiler');
+var parser = require('./src/parser');
+var lexer = require('./src/lexer');
+var runtime = require('./src/runtime');
+var nodes = require('./src/nodes');
+var installJinjaCompat = require('./src/jinja-compat');
+
+// A single instance of an environment, since this is so commonly used
+var e;
+function configure(templatesPath, opts) {
+  opts = opts || {};
+  if (lib.isObject(templatesPath)) {
+    opts = templatesPath;
+    templatesPath = null;
+  }
+  var TemplateLoader;
+  if (loaders.FileSystemLoader) {
+    TemplateLoader = new loaders.FileSystemLoader(templatesPath, {
+      watch: opts.watch,
+      noCache: opts.noCache
+    });
+  } else if (loaders.WebLoader) {
+    TemplateLoader = new loaders.WebLoader(templatesPath, {
+      useCache: opts.web && opts.web.useCache,
+      async: opts.web && opts.web.async
+    });
+  }
+  e = new Environment(TemplateLoader, opts);
+  if (opts && opts.express) {
+    e.express(opts.express);
+  }
+  return e;
+}
+module.exports = {
+  Environment: Environment,
+  Template: Template,
+  Loader: Loader,
+  FileSystemLoader: loaders.FileSystemLoader,
+  NodeResolveLoader: loaders.NodeResolveLoader,
+  PrecompiledLoader: loaders.PrecompiledLoader,
+  WebLoader: loaders.WebLoader,
+  compiler: compiler,
+  parser: parser,
+  lexer: lexer,
+  runtime: runtime,
+  lib: lib,
+  nodes: nodes,
+  installJinjaCompat: installJinjaCompat,
+  configure: configure,
+  reset: function reset() {
+    e = undefined;
+  },
+  compile: function compile(src, env, path, eagerCompile) {
+    if (!e) {
+      configure();
+    }
+    return new Template(src, env, path, eagerCompile);
+  },
+  render: function render(name, ctx, cb) {
+    if (!e) {
+      configure();
+    }
+    return e.render(name, ctx, cb);
+  },
+  renderString: function renderString(src, ctx, cb) {
+    if (!e) {
+      configure();
+    }
+    return e.renderString(src, ctx, cb);
+  },
+  precompile: precompile ? precompile.precompile : undefined,
+  precompileString: precompile ? precompile.precompileString : undefined
+};

book/node_modules/nunjucks/package.json

@@ -0,0 +1,112 @@
+{
+  "name": "nunjucks",
+  "description": "A powerful templating engine with inheritance, asynchronous control, and more (jinja2 inspired)",
+  "version": "3.2.4",
+  "author": "James Long <longster@gmail.com>",
+  "dependencies": {
+    "a-sync-waterfall": "^1.0.0",
+    "asap": "^2.0.3",
+    "commander": "^5.1.0"
+  },
+  "browser": "./browser/nunjucks.js",
+  "devDependencies": {
+    "@babel/cli": "^7.0.0-beta.38",
+    "@babel/core": "^7.0.0-beta.38",
+    "@babel/preset-env": "^7.0.0-beta.38",
+    "@babel/register": "^7.0.0-beta.38",
+    "babel-loader": "^8.0.0-beta.0",
+    "babel-plugin-istanbul": "^4.1.5",
+    "babel-plugin-module-resolver": "3.0.0-beta.5",
+    "connect": "^3.6.5",
+    "core-js": "^2.5.3",
+    "cross-env": "^5.1.3",
+    "eslint": "^4.13.0",
+    "eslint-config-airbnb-base": "^12.1.0",
+    "eslint-plugin-import": "^2.8.0",
+    "expect.js": "*",
+    "express": "4.x",
+    "fs-extra": "^5.0.0",
+    "get-port": "^3.2.0",
+    "mocha": "< 8.x",
+    "mocha-phantomjs-core": "^2.1.2",
+    "mocha-phantomjs-istanbul": "0.0.2",
+    "module-alias": "^2.0.3",
+    "node-libs-browser": "^0.7.0",
+    "nyc": "^11.4.1",
+    "phantomjs-prebuilt": "^2.1.16",
+    "serve-static": "^1.13.1",
+    "supertest": "*",
+    "uglify-js": "^2.8.29",
+    "uglifyjs-webpack-plugin": "^1.1.6",
+    "webpack": "^3.10.0"
+  },
+  "buildDependencies": {
+    "@babel/cli": "^7.0.0-beta.38",
+    "@babel/core": "^7.0.0-beta.38",
+    "@babel/preset-env": "^7.0.0-beta.38",
+    "@babel/register": "^7.0.0-beta.38",
+    "babel-loader": "^8.0.0-beta.0",
+    "babel-plugin-istanbul": "^4.1.5",
+    "babel-plugin-module-resolver": "3.0.0-beta.5",
+    "core-js": "^2.5.3",
+    "module-alias": "^2.0.3",
+    "node-libs-browser": "^0.7.0",
+    "uglify-js": "^2.8.29",
+    "uglifyjs-webpack-plugin": "^1.1.6",
+    "webpack": "^3.10.0"
+  },
+  "peerDependencies": {
+    "chokidar": "^3.3.0"
+  },
+  "peerDependenciesMeta": {
+    "chokidar": {
+      "optional": true
+    }
+  },
+  "_moduleAliases": {
+    "babel-register": "@babel/register"
+  },
+  "engines": {
+    "node": ">= 6.9.0"
+  },
+  "scripts": {
+    "build:transpile": "babel nunjucks --out-dir .",
+    "build:bundle": "node scripts/bundle.js",
+    "build": "npm run build:transpile && npm run build:bundle",
+    "codecov": "codecov",
+    "mocha": "mocha -R spec tests",
+    "lint": "eslint nunjucks scripts tests",
+    "prepare": "npm run build",
+    "test:instrument": "cross-env NODE_ENV=test scripts/bundle.js",
+    "test:runner": "cross-env NODE_ENV=test NODE_PATH=tests/test-node-pkgs scripts/testrunner.js",
+    "test": "npm run lint && npm run test:instrument && npm run test:runner"
+  },
+  "bin": {
+    "nunjucks-precompile": "./bin/precompile"
+  },
+  "main": "index.js",
+  "files": [
+    "bin/**",
+    "browser/**",
+    "src/**"
+  ],
+  "nyc": {
+    "require": [
+      "babel-register"
+    ],
+    "sourceMap": false,
+    "instrument": false
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/mozilla/nunjucks.git"
+  },
+  "keywords": [
+    "template",
+    "templating"
+  ],
+  "license": "BSD-2-Clause",
+  "bugs": {
+    "url": "https://github.com/mozilla/nunjucks/issues"
+  }
+}

book/node_modules/nunjucks/src/environment.js

@@ -0,0 +1,548 @@
+'use strict';
+
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var asap = require('asap');
+var _waterfall = require('a-sync-waterfall');
+var lib = require('./lib');
+var compiler = require('./compiler');
+var filters = require('./filters');
+var _require = require('./loaders'),
+  FileSystemLoader = _require.FileSystemLoader,
+  WebLoader = _require.WebLoader,
+  PrecompiledLoader = _require.PrecompiledLoader;
+var tests = require('./tests');
+var globals = require('./globals');
+var _require2 = require('./object'),
+  Obj = _require2.Obj,
+  EmitterObj = _require2.EmitterObj;
+var globalRuntime = require('./runtime');
+var handleError = globalRuntime.handleError,
+  Frame = globalRuntime.Frame;
+var expressApp = require('./express-app');
+
+// If the user is using the async API, *always* call it
+// asynchronously even if the template was synchronous.
+function callbackAsap(cb, err, res) {
+  asap(function () {
+    cb(err, res);
+  });
+}
+
+/**
+ * A no-op template, for use with {% include ignore missing %}
+ */
+var noopTmplSrc = {
+  type: 'code',
+  obj: {
+    root: function root(env, context, frame, runtime, cb) {
+      try {
+        cb(null, '');
+      } catch (e) {
+        cb(handleError(e, null, null));
+      }
+    }
+  }
+};
+var Environment = /*#__PURE__*/function (_EmitterObj) {
+  _inheritsLoose(Environment, _EmitterObj);
+  function Environment() {
+    return _EmitterObj.apply(this, arguments) || this;
+  }
+  var _proto = Environment.prototype;
+  _proto.init = function init(loaders, opts) {
+    var _this = this;
+    // The dev flag determines the trace that'll be shown on errors.
+    // If set to true, returns the full trace from the error point,
+    // otherwise will return trace starting from Template.render
+    // (the full trace from within nunjucks may confuse developers using
+    //  the library)
+    // defaults to false
+    opts = this.opts = opts || {};
+    this.opts.dev = !!opts.dev;
+
+    // The autoescape flag sets global autoescaping. If true,
+    // every string variable will be escaped by default.
+    // If false, strings can be manually escaped using the `escape` filter.
+    // defaults to true
+    this.opts.autoescape = opts.autoescape != null ? opts.autoescape : true;
+
+    // If true, this will make the system throw errors if trying
+    // to output a null or undefined value
+    this.opts.throwOnUndefined = !!opts.throwOnUndefined;
+    this.opts.trimBlocks = !!opts.trimBlocks;
+    this.opts.lstripBlocks = !!opts.lstripBlocks;
+    this.loaders = [];
+    if (!loaders) {
+      // The filesystem loader is only available server-side
+      if (FileSystemLoader) {
+        this.loaders = [new FileSystemLoader('views')];
+      } else if (WebLoader) {
+        this.loaders = [new WebLoader('/views')];
+      }
+    } else {
+      this.loaders = lib.isArray(loaders) ? loaders : [loaders];
+    }
+
+    // It's easy to use precompiled templates: just include them
+    // before you configure nunjucks and this will automatically
+    // pick it up and use it
+    if (typeof window !== 'undefined' && window.nunjucksPrecompiled) {
+      this.loaders.unshift(new PrecompiledLoader(window.nunjucksPrecompiled));
+    }
+    this._initLoaders();
+    this.globals = globals();
+    this.filters = {};
+    this.tests = {};
+    this.asyncFilters = [];
+    this.extensions = {};
+    this.extensionsList = [];
+    lib._entries(filters).forEach(function (_ref) {
+      var name = _ref[0],
+        filter = _ref[1];
+      return _this.addFilter(name, filter);
+    });
+    lib._entries(tests).forEach(function (_ref2) {
+      var name = _ref2[0],
+        test = _ref2[1];
+      return _this.addTest(name, test);
+    });
+  };
+  _proto._initLoaders = function _initLoaders() {
+    var _this2 = this;
+    this.loaders.forEach(function (loader) {
+      // Caching and cache busting
+      loader.cache = {};
+      if (typeof loader.on === 'function') {
+        loader.on('update', function (name, fullname) {
+          loader.cache[name] = null;
+          _this2.emit('update', name, fullname, loader);
+        });
+        loader.on('load', function (name, source) {
+          _this2.emit('load', name, source, loader);
+        });
+      }
+    });
+  };
+  _proto.invalidateCache = function invalidateCache() {
+    this.loaders.forEach(function (loader) {
+      loader.cache = {};
+    });
+  };
+  _proto.addExtension = function addExtension(name, extension) {
+    extension.__name = name;
+    this.extensions[name] = extension;
+    this.extensionsList.push(extension);
+    return this;
+  };
+  _proto.removeExtension = function removeExtension(name) {
+    var extension = this.getExtension(name);
+    if (!extension) {
+      return;
+    }
+    this.extensionsList = lib.without(this.extensionsList, extension);
+    delete this.extensions[name];
+  };
+  _proto.getExtension = function getExtension(name) {
+    return this.extensions[name];
+  };
+  _proto.hasExtension = function hasExtension(name) {
+    return !!this.extensions[name];
+  };
+  _proto.addGlobal = function addGlobal(name, value) {
+    this.globals[name] = value;
+    return this;
+  };
+  _proto.getGlobal = function getGlobal(name) {
+    if (typeof this.globals[name] === 'undefined') {
+      throw new Error('global not found: ' + name);
+    }
+    return this.globals[name];
+  };
+  _proto.addFilter = function addFilter(name, func, async) {
+    var wrapped = func;
+    if (async) {
+      this.asyncFilters.push(name);
+    }
+    this.filters[name] = wrapped;
+    return this;
+  };
+  _proto.getFilter = function getFilter(name) {
+    if (!this.filters[name]) {
+      throw new Error('filter not found: ' + name);
+    }
+    return this.filters[name];
+  };
+  _proto.addTest = function addTest(name, func) {
+    this.tests[name] = func;
+    return this;
+  };
+  _proto.getTest = function getTest(name) {
+    if (!this.tests[name]) {
+      throw new Error('test not found: ' + name);
+    }
+    return this.tests[name];
+  };
+  _proto.resolveTemplate = function resolveTemplate(loader, parentName, filename) {
+    var isRelative = loader.isRelative && parentName ? loader.isRelative(filename) : false;
+    return isRelative && loader.resolve ? loader.resolve(parentName, filename) : filename;
+  };
+  _proto.getTemplate = function getTemplate(name, eagerCompile, parentName, ignoreMissing, cb) {
+    var _this3 = this;
+    var that = this;
+    var tmpl = null;
+    if (name && name.raw) {
+      // this fixes autoescape for templates referenced in symbols
+      name = name.raw;
+    }
+    if (lib.isFunction(parentName)) {
+      cb = parentName;
+      parentName = null;
+      eagerCompile = eagerCompile || false;
+    }
+    if (lib.isFunction(eagerCompile)) {
+      cb = eagerCompile;
+      eagerCompile = false;
+    }
+    if (name instanceof Template) {
+      tmpl = name;
+    } else if (typeof name !== 'string') {
+      throw new Error('template names must be a string: ' + name);
+    } else {
+      for (var i = 0; i < this.loaders.length; i++) {
+        var loader = this.loaders[i];
+        tmpl = loader.cache[this.resolveTemplate(loader, parentName, name)];
+        if (tmpl) {
+          break;
+        }
+      }
+    }
+    if (tmpl) {
+      if (eagerCompile) {
+        tmpl.compile();
+      }
+      if (cb) {
+        cb(null, tmpl);
+        return undefined;
+      } else {
+        return tmpl;
+      }
+    }
+    var syncResult;
+    var createTemplate = function createTemplate(err, info) {
+      if (!info && !err && !ignoreMissing) {
+        err = new Error('template not found: ' + name);
+      }
+      if (err) {
+        if (cb) {
+          cb(err);
+          return;
+        } else {
+          throw err;
+        }
+      }
+      var newTmpl;
+      if (!info) {
+        newTmpl = new Template(noopTmplSrc, _this3, '', eagerCompile);
+      } else {
+        newTmpl = new Template(info.src, _this3, info.path, eagerCompile);
+        if (!info.noCache) {
+          info.loader.cache[name] = newTmpl;
+        }
+      }
+      if (cb) {
+        cb(null, newTmpl);
+      } else {
+        syncResult = newTmpl;
+      }
+    };
+    lib.asyncIter(this.loaders, function (loader, i, next, done) {
+      function handle(err, src) {
+        if (err) {
+          done(err);
+        } else if (src) {
+          src.loader = loader;
+          done(null, src);
+        } else {
+          next();
+        }
+      }
+
+      // Resolve name relative to parentName
+      name = that.resolveTemplate(loader, parentName, name);
+      if (loader.async) {
+        loader.getSource(name, handle);
+      } else {
+        handle(null, loader.getSource(name));
+      }
+    }, createTemplate);
+    return syncResult;
+  };
+  _proto.express = function express(app) {
+    return expressApp(this, app);
+  };
+  _proto.render = function render(name, ctx, cb) {
+    if (lib.isFunction(ctx)) {
+      cb = ctx;
+      ctx = null;
+    }
+
+    // We support a synchronous API to make it easier to migrate
+    // existing code to async. This works because if you don't do
+    // anything async work, the whole thing is actually run
+    // synchronously.
+    var syncResult = null;
+    this.getTemplate(name, function (err, tmpl) {
+      if (err && cb) {
+        callbackAsap(cb, err);
+      } else if (err) {
+        throw err;
+      } else {
+        syncResult = tmpl.render(ctx, cb);
+      }
+    });
+    return syncResult;
+  };
+  _proto.renderString = function renderString(src, ctx, opts, cb) {
+    if (lib.isFunction(opts)) {
+      cb = opts;
+      opts = {};
+    }
+    opts = opts || {};
+    var tmpl = new Template(src, this, opts.path);
+    return tmpl.render(ctx, cb);
+  };
+  _proto.waterfall = function waterfall(tasks, callback, forceAsync) {
+    return _waterfall(tasks, callback, forceAsync);
+  };
+  return Environment;
+}(EmitterObj);
+var Context = /*#__PURE__*/function (_Obj) {
+  _inheritsLoose(Context, _Obj);
+  function Context() {
+    return _Obj.apply(this, arguments) || this;
+  }
+  var _proto2 = Context.prototype;
+  _proto2.init = function init(ctx, blocks, env) {
+    var _this4 = this;
+    // Has to be tied to an environment so we can tap into its globals.
+    this.env = env || new Environment();
+
+    // Make a duplicate of ctx
+    this.ctx = lib.extend({}, ctx);
+    this.blocks = {};
+    this.exported = [];
+    lib.keys(blocks).forEach(function (name) {
+      _this4.addBlock(name, blocks[name]);
+    });
+  };
+  _proto2.lookup = function lookup(name) {
+    // This is one of the most called functions, so optimize for
+    // the typical case where the name isn't in the globals
+    if (name in this.env.globals && !(name in this.ctx)) {
+      return this.env.globals[name];
+    } else {
+      return this.ctx[name];
+    }
+  };
+  _proto2.setVariable = function setVariable(name, val) {
+    this.ctx[name] = val;
+  };
+  _proto2.getVariables = function getVariables() {
+    return this.ctx;
+  };
+  _proto2.addBlock = function addBlock(name, block) {
+    this.blocks[name] = this.blocks[name] || [];
+    this.blocks[name].push(block);
+    return this;
+  };
+  _proto2.getBlock = function getBlock(name) {
+    if (!this.blocks[name]) {
+      throw new Error('unknown block "' + name + '"');
+    }
+    return this.blocks[name][0];
+  };
+  _proto2.getSuper = function getSuper(env, name, block, frame, runtime, cb) {
+    var idx = lib.indexOf(this.blocks[name] || [], block);
+    var blk = this.blocks[name][idx + 1];
+    var context = this;
+    if (idx === -1 || !blk) {
+      throw new Error('no super block available for "' + name + '"');
+    }
+    blk(env, context, frame, runtime, cb);
+  };
+  _proto2.addExport = function addExport(name) {
+    this.exported.push(name);
+  };
+  _proto2.getExported = function getExported() {
+    var _this5 = this;
+    var exported = {};
+    this.exported.forEach(function (name) {
+      exported[name] = _this5.ctx[name];
+    });
+    return exported;
+  };
+  return Context;
+}(Obj);
+var Template = /*#__PURE__*/function (_Obj2) {
+  _inheritsLoose(Template, _Obj2);
+  function Template() {
+    return _Obj2.apply(this, arguments) || this;
+  }
+  var _proto3 = Template.prototype;
+  _proto3.init = function init(src, env, path, eagerCompile) {
+    this.env = env || new Environment();
+    if (lib.isObject(src)) {
+      switch (src.type) {
+        case 'code':
+          this.tmplProps = src.obj;
+          break;
+        case 'string':
+          this.tmplStr = src.obj;
+          break;
+        default:
+          throw new Error("Unexpected template object type " + src.type + "; expected 'code', or 'string'");
+      }
+    } else if (lib.isString(src)) {
+      this.tmplStr = src;
+    } else {
+      throw new Error('src must be a string or an object describing the source');
+    }
+    this.path = path;
+    if (eagerCompile) {
+      try {
+        this._compile();
+      } catch (err) {
+        throw lib._prettifyError(this.path, this.env.opts.dev, err);
+      }
+    } else {
+      this.compiled = false;
+    }
+  };
+  _proto3.render = function render(ctx, parentFrame, cb) {
+    var _this6 = this;
+    if (typeof ctx === 'function') {
+      cb = ctx;
+      ctx = {};
+    } else if (typeof parentFrame === 'function') {
+      cb = parentFrame;
+      parentFrame = null;
+    }
+
+    // If there is a parent frame, we are being called from internal
+    // code of another template, and the internal system
+    // depends on the sync/async nature of the parent template
+    // to be inherited, so force an async callback
+    var forceAsync = !parentFrame;
+
+    // Catch compile errors for async rendering
+    try {
+      this.compile();
+    } catch (e) {
+      var err = lib._prettifyError(this.path, this.env.opts.dev, e);
+      if (cb) {
+        return callbackAsap(cb, err);
+      } else {
+        throw err;
+      }
+    }
+    var context = new Context(ctx || {}, this.blocks, this.env);
+    var frame = parentFrame ? parentFrame.push(true) : new Frame();
+    frame.topLevel = true;
+    var syncResult = null;
+    var didError = false;
+    this.rootRenderFunc(this.env, context, frame, globalRuntime, function (err, res) {
+      // TODO: this is actually a bug in the compiled template (because waterfall
+      // tasks are both not passing errors up the chain of callbacks AND are not
+      // causing a return from the top-most render function). But fixing that
+      // will require a more substantial change to the compiler.
+      if (didError && cb && typeof res !== 'undefined') {
+        // prevent multiple calls to cb
+        return;
+      }
+      if (err) {
+        err = lib._prettifyError(_this6.path, _this6.env.opts.dev, err);
+        didError = true;
+      }
+      if (cb) {
+        if (forceAsync) {
+          callbackAsap(cb, err, res);
+        } else {
+          cb(err, res);
+        }
+      } else {
+        if (err) {
+          throw err;
+        }
+        syncResult = res;
+      }
+    });
+    return syncResult;
+  };
+  _proto3.getExported = function getExported(ctx, parentFrame, cb) {
+    // eslint-disable-line consistent-return
+    if (typeof ctx === 'function') {
+      cb = ctx;
+      ctx = {};
+    }
+    if (typeof parentFrame === 'function') {
+      cb = parentFrame;
+      parentFrame = null;
+    }
+
+    // Catch compile errors for async rendering
+    try {
+      this.compile();
+    } catch (e) {
+      if (cb) {
+        return cb(e);
+      } else {
+        throw e;
+      }
+    }
+    var frame = parentFrame ? parentFrame.push() : new Frame();
+    frame.topLevel = true;
+
+    // Run the rootRenderFunc to populate the context with exported vars
+    var context = new Context(ctx || {}, this.blocks, this.env);
+    this.rootRenderFunc(this.env, context, frame, globalRuntime, function (err) {
+      if (err) {
+        cb(err, null);
+      } else {
+        cb(null, context.getExported());
+      }
+    });
+  };
+  _proto3.compile = function compile() {
+    if (!this.compiled) {
+      this._compile();
+    }
+  };
+  _proto3._compile = function _compile() {
+    var props;
+    if (this.tmplProps) {
+      props = this.tmplProps;
+    } else {
+      var source = compiler.compile(this.tmplStr, this.env.asyncFilters, this.env.extensionsList, this.path, this.env.opts);
+      var func = new Function(source); // eslint-disable-line no-new-func
+      props = func();
+    }
+    this.blocks = this._getBlocks(props);
+    this.rootRenderFunc = props.root;
+    this.compiled = true;
+  };
+  _proto3._getBlocks = function _getBlocks(props) {
+    var blocks = {};
+    lib.keys(props).forEach(function (k) {
+      if (k.slice(0, 2) === 'b_') {
+        blocks[k.slice(2)] = props[k];
+      }
+    });
+    return blocks;
+  };
+  return Template;
+}(Obj);
+module.exports = {
+  Environment: Environment,
+  Template: Template
+};

book/node_modules/nunjucks/src/express-app.js

@@ -0,0 +1,23 @@
+"use strict";
+
+var path = require('path');
+module.exports = function express(env, app) {
+  function NunjucksView(name, opts) {
+    this.name = name;
+    this.path = name;
+    this.defaultEngine = opts.defaultEngine;
+    this.ext = path.extname(name);
+    if (!this.ext && !this.defaultEngine) {
+      throw new Error('No default engine was specified and no extension was provided.');
+    }
+    if (!this.ext) {
+      this.name += this.ext = (this.defaultEngine[0] !== '.' ? '.' : '') + this.defaultEngine;
+    }
+  }
+  NunjucksView.prototype.render = function render(opts, cb) {
+    env.render(this.name, opts, cb);
+  };
+  app.set('view', NunjucksView);
+  app.set('nunjucksEnv', env);
+  return env;
+};

book/node_modules/nunjucks/src/filters.js

@@ -0,0 +1,546 @@
+'use strict';
+
+var lib = require('./lib');
+var r = require('./runtime');
+var _exports = module.exports = {};
+function normalize(value, defaultValue) {
+  if (value === null || value === undefined || value === false) {
+    return defaultValue;
+  }
+  return value;
+}
+_exports.abs = Math.abs;
+function isNaN(num) {
+  return num !== num; // eslint-disable-line no-self-compare
+}
+
+function batch(arr, linecount, fillWith) {
+  var i;
+  var res = [];
+  var tmp = [];
+  for (i = 0; i < arr.length; i++) {
+    if (i % linecount === 0 && tmp.length) {
+      res.push(tmp);
+      tmp = [];
+    }
+    tmp.push(arr[i]);
+  }
+  if (tmp.length) {
+    if (fillWith) {
+      for (i = tmp.length; i < linecount; i++) {
+        tmp.push(fillWith);
+      }
+    }
+    res.push(tmp);
+  }
+  return res;
+}
+_exports.batch = batch;
+function capitalize(str) {
+  str = normalize(str, '');
+  var ret = str.toLowerCase();
+  return r.copySafeness(str, ret.charAt(0).toUpperCase() + ret.slice(1));
+}
+_exports.capitalize = capitalize;
+function center(str, width) {
+  str = normalize(str, '');
+  width = width || 80;
+  if (str.length >= width) {
+    return str;
+  }
+  var spaces = width - str.length;
+  var pre = lib.repeat(' ', spaces / 2 - spaces % 2);
+  var post = lib.repeat(' ', spaces / 2);
+  return r.copySafeness(str, pre + str + post);
+}
+_exports.center = center;
+function default_(val, def, bool) {
+  if (bool) {
+    return val || def;
+  } else {
+    return val !== undefined ? val : def;
+  }
+}
+
+// TODO: it is confusing to export something called 'default'
+_exports['default'] = default_; // eslint-disable-line dot-notation
+
+function dictsort(val, caseSensitive, by) {
+  if (!lib.isObject(val)) {
+    throw new lib.TemplateError('dictsort filter: val must be an object');
+  }
+  var array = [];
+  // deliberately include properties from the object's prototype
+  for (var k in val) {
+    // eslint-disable-line guard-for-in, no-restricted-syntax
+    array.push([k, val[k]]);
+  }
+  var si;
+  if (by === undefined || by === 'key') {
+    si = 0;
+  } else if (by === 'value') {
+    si = 1;
+  } else {
+    throw new lib.TemplateError('dictsort filter: You can only sort by either key or value');
+  }
+  array.sort(function (t1, t2) {
+    var a = t1[si];
+    var b = t2[si];
+    if (!caseSensitive) {
+      if (lib.isString(a)) {
+        a = a.toUpperCase();
+      }
+      if (lib.isString(b)) {
+        b = b.toUpperCase();
+      }
+    }
+    return a > b ? 1 : a === b ? 0 : -1; // eslint-disable-line no-nested-ternary
+  });
+
+  return array;
+}
+_exports.dictsort = dictsort;
+function dump(obj, spaces) {
+  return JSON.stringify(obj, null, spaces);
+}
+_exports.dump = dump;
+function escape(str) {
+  if (str instanceof r.SafeString) {
+    return str;
+  }
+  str = str === null || str === undefined ? '' : str;
+  return r.markSafe(lib.escape(str.toString()));
+}
+_exports.escape = escape;
+function safe(str) {
+  if (str instanceof r.SafeString) {
+    return str;
+  }
+  str = str === null || str === undefined ? '' : str;
+  return r.markSafe(str.toString());
+}
+_exports.safe = safe;
+function first(arr) {
+  return arr[0];
+}
+_exports.first = first;
+function forceescape(str) {
+  str = str === null || str === undefined ? '' : str;
+  return r.markSafe(lib.escape(str.toString()));
+}
+_exports.forceescape = forceescape;
+function groupby(arr, attr) {
+  return lib.groupBy(arr, attr, this.env.opts.throwOnUndefined);
+}
+_exports.groupby = groupby;
+function indent(str, width, indentfirst) {
+  str = normalize(str, '');
+  if (str === '') {
+    return '';
+  }
+  width = width || 4;
+  // let res = '';
+  var lines = str.split('\n');
+  var sp = lib.repeat(' ', width);
+  var res = lines.map(function (l, i) {
+    return i === 0 && !indentfirst ? l : "" + sp + l;
+  }).join('\n');
+  return r.copySafeness(str, res);
+}
+_exports.indent = indent;
+function join(arr, del, attr) {
+  del = del || '';
+  if (attr) {
+    arr = lib.map(arr, function (v) {
+      return v[attr];
+    });
+  }
+  return arr.join(del);
+}
+_exports.join = join;
+function last(arr) {
+  return arr[arr.length - 1];
+}
+_exports.last = last;
+function lengthFilter(val) {
+  var value = normalize(val, '');
+  if (value !== undefined) {
+    if (typeof Map === 'function' && value instanceof Map || typeof Set === 'function' && value instanceof Set) {
+      // ECMAScript 2015 Maps and Sets
+      return value.size;
+    }
+    if (lib.isObject(value) && !(value instanceof r.SafeString)) {
+      // Objects (besides SafeStrings), non-primative Arrays
+      return lib.keys(value).length;
+    }
+    return value.length;
+  }
+  return 0;
+}
+_exports.length = lengthFilter;
+function list(val) {
+  if (lib.isString(val)) {
+    return val.split('');
+  } else if (lib.isObject(val)) {
+    return lib._entries(val || {}).map(function (_ref) {
+      var key = _ref[0],
+        value = _ref[1];
+      return {
+        key: key,
+        value: value
+      };
+    });
+  } else if (lib.isArray(val)) {
+    return val;
+  } else {
+    throw new lib.TemplateError('list filter: type not iterable');
+  }
+}
+_exports.list = list;
+function lower(str) {
+  str = normalize(str, '');
+  return str.toLowerCase();
+}
+_exports.lower = lower;
+function nl2br(str) {
+  if (str === null || str === undefined) {
+    return '';
+  }
+  return r.copySafeness(str, str.replace(/\r\n|\n/g, '<br />\n'));
+}
+_exports.nl2br = nl2br;
+function random(arr) {
+  return arr[Math.floor(Math.random() * arr.length)];
+}
+_exports.random = random;
+
+/**
+ * Construct select or reject filter
+ *
+ * @param {boolean} expectedTestResult
+ * @returns {function(array, string, *): array}
+ */
+function getSelectOrReject(expectedTestResult) {
+  function filter(arr, testName, secondArg) {
+    if (testName === void 0) {
+      testName = 'truthy';
+    }
+    var context = this;
+    var test = context.env.getTest(testName);
+    return lib.toArray(arr).filter(function examineTestResult(item) {
+      return test.call(context, item, secondArg) === expectedTestResult;
+    });
+  }
+  return filter;
+}
+_exports.reject = getSelectOrReject(false);
+function rejectattr(arr, attr) {
+  return arr.filter(function (item) {
+    return !item[attr];
+  });
+}
+_exports.rejectattr = rejectattr;
+_exports.select = getSelectOrReject(true);
+function selectattr(arr, attr) {
+  return arr.filter(function (item) {
+    return !!item[attr];
+  });
+}
+_exports.selectattr = selectattr;
+function replace(str, old, new_, maxCount) {
+  var originalStr = str;
+  if (old instanceof RegExp) {
+    return str.replace(old, new_);
+  }
+  if (typeof maxCount === 'undefined') {
+    maxCount = -1;
+  }
+  var res = ''; // Output
+
+  // Cast Numbers in the search term to string
+  if (typeof old === 'number') {
+    old = '' + old;
+  } else if (typeof old !== 'string') {
+    // If it is something other than number or string,
+    // return the original string
+    return str;
+  }
+
+  // Cast numbers in the replacement to string
+  if (typeof str === 'number') {
+    str = '' + str;
+  }
+
+  // If by now, we don't have a string, throw it back
+  if (typeof str !== 'string' && !(str instanceof r.SafeString)) {
+    return str;
+  }
+
+  // ShortCircuits
+  if (old === '') {
+    // Mimic the python behaviour: empty string is replaced
+    // by replacement e.g. "abc"|replace("", ".") -> .a.b.c.
+    res = new_ + str.split('').join(new_) + new_;
+    return r.copySafeness(str, res);
+  }
+  var nextIndex = str.indexOf(old);
+  // if # of replacements to perform is 0, or the string to does
+  // not contain the old value, return the string
+  if (maxCount === 0 || nextIndex === -1) {
+    return str;
+  }
+  var pos = 0;
+  var count = 0; // # of replacements made
+
+  while (nextIndex > -1 && (maxCount === -1 || count < maxCount)) {
+    // Grab the next chunk of src string and add it with the
+    // replacement, to the result
+    res += str.substring(pos, nextIndex) + new_;
+    // Increment our pointer in the src string
+    pos = nextIndex + old.length;
+    count++;
+    // See if there are any more replacements to be made
+    nextIndex = str.indexOf(old, pos);
+  }
+
+  // We've either reached the end, or done the max # of
+  // replacements, tack on any remaining string
+  if (pos < str.length) {
+    res += str.substring(pos);
+  }
+  return r.copySafeness(originalStr, res);
+}
+_exports.replace = replace;
+function reverse(val) {
+  var arr;
+  if (lib.isString(val)) {
+    arr = list(val);
+  } else {
+    // Copy it
+    arr = lib.map(val, function (v) {
+      return v;
+    });
+  }
+  arr.reverse();
+  if (lib.isString(val)) {
+    return r.copySafeness(val, arr.join(''));
+  }
+  return arr;
+}
+_exports.reverse = reverse;
+function round(val, precision, method) {
+  precision = precision || 0;
+  var factor = Math.pow(10, precision);
+  var rounder;
+  if (method === 'ceil') {
+    rounder = Math.ceil;
+  } else if (method === 'floor') {
+    rounder = Math.floor;
+  } else {
+    rounder = Math.round;
+  }
+  return rounder(val * factor) / factor;
+}
+_exports.round = round;
+function slice(arr, slices, fillWith) {
+  var sliceLength = Math.floor(arr.length / slices);
+  var extra = arr.length % slices;
+  var res = [];
+  var offset = 0;
+  for (var i = 0; i < slices; i++) {
+    var start = offset + i * sliceLength;
+    if (i < extra) {
+      offset++;
+    }
+    var end = offset + (i + 1) * sliceLength;
+    var currSlice = arr.slice(start, end);
+    if (fillWith && i >= extra) {
+      currSlice.push(fillWith);
+    }
+    res.push(currSlice);
+  }
+  return res;
+}
+_exports.slice = slice;
+function sum(arr, attr, start) {
+  if (start === void 0) {
+    start = 0;
+  }
+  if (attr) {
+    arr = lib.map(arr, function (v) {
+      return v[attr];
+    });
+  }
+  return start + arr.reduce(function (a, b) {
+    return a + b;
+  }, 0);
+}
+_exports.sum = sum;
+_exports.sort = r.makeMacro(['value', 'reverse', 'case_sensitive', 'attribute'], [], function sortFilter(arr, reversed, caseSens, attr) {
+  var _this = this;
+  // Copy it
+  var array = lib.map(arr, function (v) {
+    return v;
+  });
+  var getAttribute = lib.getAttrGetter(attr);
+  array.sort(function (a, b) {
+    var x = attr ? getAttribute(a) : a;
+    var y = attr ? getAttribute(b) : b;
+    if (_this.env.opts.throwOnUndefined && attr && (x === undefined || y === undefined)) {
+      throw new TypeError("sort: attribute \"" + attr + "\" resolved to undefined");
+    }
+    if (!caseSens && lib.isString(x) && lib.isString(y)) {
+      x = x.toLowerCase();
+      y = y.toLowerCase();
+    }
+    if (x < y) {
+      return reversed ? 1 : -1;
+    } else if (x > y) {
+      return reversed ? -1 : 1;
+    } else {
+      return 0;
+    }
+  });
+  return array;
+});
+function string(obj) {
+  return r.copySafeness(obj, obj);
+}
+_exports.string = string;
+function striptags(input, preserveLinebreaks) {
+  input = normalize(input, '');
+  var tags = /<\/?([a-z][a-z0-9]*)\b[^>]*>|<!--[\s\S]*?-->/gi;
+  var trimmedInput = trim(input.replace(tags, ''));
+  var res = '';
+  if (preserveLinebreaks) {
+    res = trimmedInput.replace(/^ +| +$/gm, '') // remove leading and trailing spaces
+    .replace(/ +/g, ' ') // squash adjacent spaces
+    .replace(/(\r\n)/g, '\n') // normalize linebreaks (CRLF -> LF)
+    .replace(/\n\n\n+/g, '\n\n'); // squash abnormal adjacent linebreaks
+  } else {
+    res = trimmedInput.replace(/\s+/gi, ' ');
+  }
+  return r.copySafeness(input, res);
+}
+_exports.striptags = striptags;
+function title(str) {
+  str = normalize(str, '');
+  var words = str.split(' ').map(function (word) {
+    return capitalize(word);
+  });
+  return r.copySafeness(str, words.join(' '));
+}
+_exports.title = title;
+function trim(str) {
+  return r.copySafeness(str, str.replace(/^\s*|\s*$/g, ''));
+}
+_exports.trim = trim;
+function truncate(input, length, killwords, end) {
+  var orig = input;
+  input = normalize(input, '');
+  length = length || 255;
+  if (input.length <= length) {
+    return input;
+  }
+  if (killwords) {
+    input = input.substring(0, length);
+  } else {
+    var idx = input.lastIndexOf(' ', length);
+    if (idx === -1) {
+      idx = length;
+    }
+    input = input.substring(0, idx);
+  }
+  input += end !== undefined && end !== null ? end : '...';
+  return r.copySafeness(orig, input);
+}
+_exports.truncate = truncate;
+function upper(str) {
+  str = normalize(str, '');
+  return str.toUpperCase();
+}
+_exports.upper = upper;
+function urlencode(obj) {
+  var enc = encodeURIComponent;
+  if (lib.isString(obj)) {
+    return enc(obj);
+  } else {
+    var keyvals = lib.isArray(obj) ? obj : lib._entries(obj);
+    return keyvals.map(function (_ref2) {
+      var k = _ref2[0],
+        v = _ref2[1];
+      return enc(k) + "=" + enc(v);
+    }).join('&');
+  }
+}
+_exports.urlencode = urlencode;
+
+// For the jinja regexp, see
+// https://github.com/mitsuhiko/jinja2/blob/f15b814dcba6aa12bc74d1f7d0c881d55f7126be/jinja2/utils.py#L20-L23
+var puncRe = /^(?:\(|<|&lt;)?(.*?)(?:\.|,|\)|\n|&gt;)?$/;
+// from http://blog.gerv.net/2011/05/html5_email_address_regexp/
+var emailRe = /^[\w.!#$%&'*+\-\/=?\^`{|}~]+@[a-z\d\-]+(\.[a-z\d\-]+)+$/i;
+var httpHttpsRe = /^https?:\/\/.*$/;
+var wwwRe = /^www\./;
+var tldRe = /\.(?:org|net|com)(?:\:|\/|$)/;
+function urlize(str, length, nofollow) {
+  if (isNaN(length)) {
+    length = Infinity;
+  }
+  var noFollowAttr = nofollow === true ? ' rel="nofollow"' : '';
+  var words = str.split(/(\s+)/).filter(function (word) {
+    // If the word has no length, bail. This can happen for str with
+    // trailing whitespace.
+    return word && word.length;
+  }).map(function (word) {
+    var matches = word.match(puncRe);
+    var possibleUrl = matches ? matches[1] : word;
+    var shortUrl = possibleUrl.substr(0, length);
+
+    // url that starts with http or https
+    if (httpHttpsRe.test(possibleUrl)) {
+      return "<a href=\"" + possibleUrl + "\"" + noFollowAttr + ">" + shortUrl + "</a>";
+    }
+
+    // url that starts with www.
+    if (wwwRe.test(possibleUrl)) {
+      return "<a href=\"http://" + possibleUrl + "\"" + noFollowAttr + ">" + shortUrl + "</a>";
+    }
+
+    // an email address of the form username@domain.tld
+    if (emailRe.test(possibleUrl)) {
+      return "<a href=\"mailto:" + possibleUrl + "\">" + possibleUrl + "</a>";
+    }
+
+    // url that ends in .com, .org or .net that is not an email address
+    if (tldRe.test(possibleUrl)) {
+      return "<a href=\"http://" + possibleUrl + "\"" + noFollowAttr + ">" + shortUrl + "</a>";
+    }
+    return word;
+  });
+  return words.join('');
+}
+_exports.urlize = urlize;
+function wordcount(str) {
+  str = normalize(str, '');
+  var words = str ? str.match(/\w+/g) : null;
+  return words ? words.length : null;
+}
+_exports.wordcount = wordcount;
+function float(val, def) {
+  var res = parseFloat(val);
+  return isNaN(res) ? def : res;
+}
+_exports.float = float;
+var intFilter = r.makeMacro(['value', 'default', 'base'], [], function doInt(value, defaultValue, base) {
+  if (base === void 0) {
+    base = 10;
+  }
+  var res = parseInt(value, base);
+  return isNaN(res) ? defaultValue : res;
+});
+_exports.int = intFilter;
+
+// Aliases
+_exports.d = _exports.default;
+_exports.e = _exports.escape;

book/node_modules/nunjucks/src/globals.js

@@ -0,0 +1,65 @@
+'use strict';
+
+function _cycler(items) {
+  var index = -1;
+  return {
+    current: null,
+    reset: function reset() {
+      index = -1;
+      this.current = null;
+    },
+    next: function next() {
+      index++;
+      if (index >= items.length) {
+        index = 0;
+      }
+      this.current = items[index];
+      return this.current;
+    }
+  };
+}
+function _joiner(sep) {
+  sep = sep || ',';
+  var first = true;
+  return function () {
+    var val = first ? '' : sep;
+    first = false;
+    return val;
+  };
+}
+
+// Making this a function instead so it returns a new object
+// each time it's called. That way, if something like an environment
+// uses it, they will each have their own copy.
+function globals() {
+  return {
+    range: function range(start, stop, step) {
+      if (typeof stop === 'undefined') {
+        stop = start;
+        start = 0;
+        step = 1;
+      } else if (!step) {
+        step = 1;
+      }
+      var arr = [];
+      if (step > 0) {
+        for (var i = start; i < stop; i += step) {
+          arr.push(i);
+        }
+      } else {
+        for (var _i = start; _i > stop; _i += step) {
+          // eslint-disable-line for-direction
+          arr.push(_i);
+        }
+      }
+      return arr;
+    },
+    cycler: function cycler() {
+      return _cycler(Array.prototype.slice.call(arguments));
+    },
+    joiner: function joiner(sep) {
+      return _joiner(sep);
+    }
+  };
+}
+module.exports = globals;

book/node_modules/nunjucks/src/jinja-compat.js

@@ -0,0 +1,293 @@
+"use strict";
+
+function installCompat() {
+  'use strict';
+
+  /* eslint-disable camelcase */
+
+  // This must be called like `nunjucks.installCompat` so that `this`
+  // references the nunjucks instance
+  var runtime = this.runtime;
+  var lib = this.lib;
+  // Handle slim case where these 'modules' are excluded from the built source
+  var Compiler = this.compiler.Compiler;
+  var Parser = this.parser.Parser;
+  var nodes = this.nodes;
+  var lexer = this.lexer;
+  var orig_contextOrFrameLookup = runtime.contextOrFrameLookup;
+  var orig_memberLookup = runtime.memberLookup;
+  var orig_Compiler_assertType;
+  var orig_Parser_parseAggregate;
+  if (Compiler) {
+    orig_Compiler_assertType = Compiler.prototype.assertType;
+  }
+  if (Parser) {
+    orig_Parser_parseAggregate = Parser.prototype.parseAggregate;
+  }
+  function uninstall() {
+    runtime.contextOrFrameLookup = orig_contextOrFrameLookup;
+    runtime.memberLookup = orig_memberLookup;
+    if (Compiler) {
+      Compiler.prototype.assertType = orig_Compiler_assertType;
+    }
+    if (Parser) {
+      Parser.prototype.parseAggregate = orig_Parser_parseAggregate;
+    }
+  }
+  runtime.contextOrFrameLookup = function contextOrFrameLookup(context, frame, key) {
+    var val = orig_contextOrFrameLookup.apply(this, arguments);
+    if (val !== undefined) {
+      return val;
+    }
+    switch (key) {
+      case 'True':
+        return true;
+      case 'False':
+        return false;
+      case 'None':
+        return null;
+      default:
+        return undefined;
+    }
+  };
+  function getTokensState(tokens) {
+    return {
+      index: tokens.index,
+      lineno: tokens.lineno,
+      colno: tokens.colno
+    };
+  }
+  if (process.env.BUILD_TYPE !== 'SLIM' && nodes && Compiler && Parser) {
+    // i.e., not slim mode
+    var Slice = nodes.Node.extend('Slice', {
+      fields: ['start', 'stop', 'step'],
+      init: function init(lineno, colno, start, stop, step) {
+        start = start || new nodes.Literal(lineno, colno, null);
+        stop = stop || new nodes.Literal(lineno, colno, null);
+        step = step || new nodes.Literal(lineno, colno, 1);
+        this.parent(lineno, colno, start, stop, step);
+      }
+    });
+    Compiler.prototype.assertType = function assertType(node) {
+      if (node instanceof Slice) {
+        return;
+      }
+      orig_Compiler_assertType.apply(this, arguments);
+    };
+    Compiler.prototype.compileSlice = function compileSlice(node, frame) {
+      this._emit('(');
+      this._compileExpression(node.start, frame);
+      this._emit('),(');
+      this._compileExpression(node.stop, frame);
+      this._emit('),(');
+      this._compileExpression(node.step, frame);
+      this._emit(')');
+    };
+    Parser.prototype.parseAggregate = function parseAggregate() {
+      var _this = this;
+      var origState = getTokensState(this.tokens);
+      // Set back one accounting for opening bracket/parens
+      origState.colno--;
+      origState.index--;
+      try {
+        return orig_Parser_parseAggregate.apply(this);
+      } catch (e) {
+        var errState = getTokensState(this.tokens);
+        var rethrow = function rethrow() {
+          lib._assign(_this.tokens, errState);
+          return e;
+        };
+
+        // Reset to state before original parseAggregate called
+        lib._assign(this.tokens, origState);
+        this.peeked = false;
+        var tok = this.peekToken();
+        if (tok.type !== lexer.TOKEN_LEFT_BRACKET) {
+          throw rethrow();
+        } else {
+          this.nextToken();
+        }
+        var node = new Slice(tok.lineno, tok.colno);
+
+        // If we don't encounter a colon while parsing, this is not a slice,
+        // so re-raise the original exception.
+        var isSlice = false;
+        for (var i = 0; i <= node.fields.length; i++) {
+          if (this.skip(lexer.TOKEN_RIGHT_BRACKET)) {
+            break;
+          }
+          if (i === node.fields.length) {
+            if (isSlice) {
+              this.fail('parseSlice: too many slice components', tok.lineno, tok.colno);
+            } else {
+              break;
+            }
+          }
+          if (this.skip(lexer.TOKEN_COLON)) {
+            isSlice = true;
+          } else {
+            var field = node.fields[i];
+            node[field] = this.parseExpression();
+            isSlice = this.skip(lexer.TOKEN_COLON) || isSlice;
+          }
+        }
+        if (!isSlice) {
+          throw rethrow();
+        }
+        return new nodes.Array(tok.lineno, tok.colno, [node]);
+      }
+    };
+  }
+  function sliceLookup(obj, start, stop, step) {
+    obj = obj || [];
+    if (start === null) {
+      start = step < 0 ? obj.length - 1 : 0;
+    }
+    if (stop === null) {
+      stop = step < 0 ? -1 : obj.length;
+    } else if (stop < 0) {
+      stop += obj.length;
+    }
+    if (start < 0) {
+      start += obj.length;
+    }
+    var results = [];
+    for (var i = start;; i += step) {
+      if (i < 0 || i > obj.length) {
+        break;
+      }
+      if (step > 0 && i >= stop) {
+        break;
+      }
+      if (step < 0 && i <= stop) {
+        break;
+      }
+      results.push(runtime.memberLookup(obj, i));
+    }
+    return results;
+  }
+  function hasOwnProp(obj, key) {
+    return Object.prototype.hasOwnProperty.call(obj, key);
+  }
+  var ARRAY_MEMBERS = {
+    pop: function pop(index) {
+      if (index === undefined) {
+        return this.pop();
+      }
+      if (index >= this.length || index < 0) {
+        throw new Error('KeyError');
+      }
+      return this.splice(index, 1);
+    },
+    append: function append(element) {
+      return this.push(element);
+    },
+    remove: function remove(element) {
+      for (var i = 0; i < this.length; i++) {
+        if (this[i] === element) {
+          return this.splice(i, 1);
+        }
+      }
+      throw new Error('ValueError');
+    },
+    count: function count(element) {
+      var count = 0;
+      for (var i = 0; i < this.length; i++) {
+        if (this[i] === element) {
+          count++;
+        }
+      }
+      return count;
+    },
+    index: function index(element) {
+      var i;
+      if ((i = this.indexOf(element)) === -1) {
+        throw new Error('ValueError');
+      }
+      return i;
+    },
+    find: function find(element) {
+      return this.indexOf(element);
+    },
+    insert: function insert(index, elem) {
+      return this.splice(index, 0, elem);
+    }
+  };
+  var OBJECT_MEMBERS = {
+    items: function items() {
+      return lib._entries(this);
+    },
+    values: function values() {
+      return lib._values(this);
+    },
+    keys: function keys() {
+      return lib.keys(this);
+    },
+    get: function get(key, def) {
+      var output = this[key];
+      if (output === undefined) {
+        output = def;
+      }
+      return output;
+    },
+    has_key: function has_key(key) {
+      return hasOwnProp(this, key);
+    },
+    pop: function pop(key, def) {
+      var output = this[key];
+      if (output === undefined && def !== undefined) {
+        output = def;
+      } else if (output === undefined) {
+        throw new Error('KeyError');
+      } else {
+        delete this[key];
+      }
+      return output;
+    },
+    popitem: function popitem() {
+      var keys = lib.keys(this);
+      if (!keys.length) {
+        throw new Error('KeyError');
+      }
+      var k = keys[0];
+      var val = this[k];
+      delete this[k];
+      return [k, val];
+    },
+    setdefault: function setdefault(key, def) {
+      if (def === void 0) {
+        def = null;
+      }
+      if (!(key in this)) {
+        this[key] = def;
+      }
+      return this[key];
+    },
+    update: function update(kwargs) {
+      lib._assign(this, kwargs);
+      return null; // Always returns None
+    }
+  };
+
+  OBJECT_MEMBERS.iteritems = OBJECT_MEMBERS.items;
+  OBJECT_MEMBERS.itervalues = OBJECT_MEMBERS.values;
+  OBJECT_MEMBERS.iterkeys = OBJECT_MEMBERS.keys;
+  runtime.memberLookup = function memberLookup(obj, val, autoescape) {
+    if (arguments.length === 4) {
+      return sliceLookup.apply(this, arguments);
+    }
+    obj = obj || {};
+
+    // If the object is an object, return any of the methods that Python would
+    // otherwise provide.
+    if (lib.isArray(obj) && hasOwnProp(ARRAY_MEMBERS, val)) {
+      return ARRAY_MEMBERS[val].bind(obj);
+    }
+    if (lib.isObject(obj) && hasOwnProp(OBJECT_MEMBERS, val)) {
+      return OBJECT_MEMBERS[val].bind(obj);
+    }
+    return orig_memberLookup.apply(this, arguments);
+  };
+  return uninstall;
+}
+module.exports = installCompat;

book/node_modules/nunjucks/src/lexer.js

@@ -0,0 +1,474 @@
+'use strict';
+
+var lib = require('./lib');
+var whitespaceChars = " \n\t\r\xA0";
+var delimChars = '()[]{}%*-+~/#,:|.<>=!';
+var intChars = '0123456789';
+var BLOCK_START = '{%';
+var BLOCK_END = '%}';
+var VARIABLE_START = '{{';
+var VARIABLE_END = '}}';
+var COMMENT_START = '{#';
+var COMMENT_END = '#}';
+var TOKEN_STRING = 'string';
+var TOKEN_WHITESPACE = 'whitespace';
+var TOKEN_DATA = 'data';
+var TOKEN_BLOCK_START = 'block-start';
+var TOKEN_BLOCK_END = 'block-end';
+var TOKEN_VARIABLE_START = 'variable-start';
+var TOKEN_VARIABLE_END = 'variable-end';
+var TOKEN_COMMENT = 'comment';
+var TOKEN_LEFT_PAREN = 'left-paren';
+var TOKEN_RIGHT_PAREN = 'right-paren';
+var TOKEN_LEFT_BRACKET = 'left-bracket';
+var TOKEN_RIGHT_BRACKET = 'right-bracket';
+var TOKEN_LEFT_CURLY = 'left-curly';
+var TOKEN_RIGHT_CURLY = 'right-curly';
+var TOKEN_OPERATOR = 'operator';
+var TOKEN_COMMA = 'comma';
+var TOKEN_COLON = 'colon';
+var TOKEN_TILDE = 'tilde';
+var TOKEN_PIPE = 'pipe';
+var TOKEN_INT = 'int';
+var TOKEN_FLOAT = 'float';
+var TOKEN_BOOLEAN = 'boolean';
+var TOKEN_NONE = 'none';
+var TOKEN_SYMBOL = 'symbol';
+var TOKEN_SPECIAL = 'special';
+var TOKEN_REGEX = 'regex';
+function token(type, value, lineno, colno) {
+  return {
+    type: type,
+    value: value,
+    lineno: lineno,
+    colno: colno
+  };
+}
+var Tokenizer = /*#__PURE__*/function () {
+  function Tokenizer(str, opts) {
+    this.str = str;
+    this.index = 0;
+    this.len = str.length;
+    this.lineno = 0;
+    this.colno = 0;
+    this.in_code = false;
+    opts = opts || {};
+    var tags = opts.tags || {};
+    this.tags = {
+      BLOCK_START: tags.blockStart || BLOCK_START,
+      BLOCK_END: tags.blockEnd || BLOCK_END,
+      VARIABLE_START: tags.variableStart || VARIABLE_START,
+      VARIABLE_END: tags.variableEnd || VARIABLE_END,
+      COMMENT_START: tags.commentStart || COMMENT_START,
+      COMMENT_END: tags.commentEnd || COMMENT_END
+    };
+    this.trimBlocks = !!opts.trimBlocks;
+    this.lstripBlocks = !!opts.lstripBlocks;
+  }
+  var _proto = Tokenizer.prototype;
+  _proto.nextToken = function nextToken() {
+    var lineno = this.lineno;
+    var colno = this.colno;
+    var tok;
+    if (this.in_code) {
+      // Otherwise, if we are in a block parse it as code
+      var cur = this.current();
+      if (this.isFinished()) {
+        // We have nothing else to parse
+        return null;
+      } else if (cur === '"' || cur === '\'') {
+        // We've hit a string
+        return token(TOKEN_STRING, this._parseString(cur), lineno, colno);
+      } else if (tok = this._extract(whitespaceChars)) {
+        // We hit some whitespace
+        return token(TOKEN_WHITESPACE, tok, lineno, colno);
+      } else if ((tok = this._extractString(this.tags.BLOCK_END)) || (tok = this._extractString('-' + this.tags.BLOCK_END))) {
+        // Special check for the block end tag
+        //
+        // It is a requirement that start and end tags are composed of
+        // delimiter characters (%{}[] etc), and our code always
+        // breaks on delimiters so we can assume the token parsing
+        // doesn't consume these elsewhere
+        this.in_code = false;
+        if (this.trimBlocks) {
+          cur = this.current();
+          if (cur === '\n') {
+            // Skip newline
+            this.forward();
+          } else if (cur === '\r') {
+            // Skip CRLF newline
+            this.forward();
+            cur = this.current();
+            if (cur === '\n') {
+              this.forward();
+            } else {
+              // Was not a CRLF, so go back
+              this.back();
+            }
+          }
+        }
+        return token(TOKEN_BLOCK_END, tok, lineno, colno);
+      } else if ((tok = this._extractString(this.tags.VARIABLE_END)) || (tok = this._extractString('-' + this.tags.VARIABLE_END))) {
+        // Special check for variable end tag (see above)
+        this.in_code = false;
+        return token(TOKEN_VARIABLE_END, tok, lineno, colno);
+      } else if (cur === 'r' && this.str.charAt(this.index + 1) === '/') {
+        // Skip past 'r/'.
+        this.forwardN(2);
+
+        // Extract until the end of the regex -- / ends it, \/ does not.
+        var regexBody = '';
+        while (!this.isFinished()) {
+          if (this.current() === '/' && this.previous() !== '\\') {
+            this.forward();
+            break;
+          } else {
+            regexBody += this.current();
+            this.forward();
+          }
+        }
+
+        // Check for flags.
+        // The possible flags are according to https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/RegExp)
+        var POSSIBLE_FLAGS = ['g', 'i', 'm', 'y'];
+        var regexFlags = '';
+        while (!this.isFinished()) {
+          var isCurrentAFlag = POSSIBLE_FLAGS.indexOf(this.current()) !== -1;
+          if (isCurrentAFlag) {
+            regexFlags += this.current();
+            this.forward();
+          } else {
+            break;
+          }
+        }
+        return token(TOKEN_REGEX, {
+          body: regexBody,
+          flags: regexFlags
+        }, lineno, colno);
+      } else if (delimChars.indexOf(cur) !== -1) {
+        // We've hit a delimiter (a special char like a bracket)
+        this.forward();
+        var complexOps = ['==', '===', '!=', '!==', '<=', '>=', '//', '**'];
+        var curComplex = cur + this.current();
+        var type;
+        if (lib.indexOf(complexOps, curComplex) !== -1) {
+          this.forward();
+          cur = curComplex;
+
+          // See if this is a strict equality/inequality comparator
+          if (lib.indexOf(complexOps, curComplex + this.current()) !== -1) {
+            cur = curComplex + this.current();
+            this.forward();
+          }
+        }
+        switch (cur) {
+          case '(':
+            type = TOKEN_LEFT_PAREN;
+            break;
+          case ')':
+            type = TOKEN_RIGHT_PAREN;
+            break;
+          case '[':
+            type = TOKEN_LEFT_BRACKET;
+            break;
+          case ']':
+            type = TOKEN_RIGHT_BRACKET;
+            break;
+          case '{':
+            type = TOKEN_LEFT_CURLY;
+            break;
+          case '}':
+            type = TOKEN_RIGHT_CURLY;
+            break;
+          case ',':
+            type = TOKEN_COMMA;
+            break;
+          case ':':
+            type = TOKEN_COLON;
+            break;
+          case '~':
+            type = TOKEN_TILDE;
+            break;
+          case '|':
+            type = TOKEN_PIPE;
+            break;
+          default:
+            type = TOKEN_OPERATOR;
+        }
+        return token(type, cur, lineno, colno);
+      } else {
+        // We are not at whitespace or a delimiter, so extract the
+        // text and parse it
+        tok = this._extractUntil(whitespaceChars + delimChars);
+        if (tok.match(/^[-+]?[0-9]+$/)) {
+          if (this.current() === '.') {
+            this.forward();
+            var dec = this._extract(intChars);
+            return token(TOKEN_FLOAT, tok + '.' + dec, lineno, colno);
+          } else {
+            return token(TOKEN_INT, tok, lineno, colno);
+          }
+        } else if (tok.match(/^(true|false)$/)) {
+          return token(TOKEN_BOOLEAN, tok, lineno, colno);
+        } else if (tok === 'none') {
+          return token(TOKEN_NONE, tok, lineno, colno);
+          /*
+           * Added to make the test `null is null` evaluate truthily.
+           * Otherwise, Nunjucks will look up null in the context and
+           * return `undefined`, which is not what we want. This *may* have
+           * consequences is someone is using null in their templates as a
+           * variable.
+           */
+        } else if (tok === 'null') {
+          return token(TOKEN_NONE, tok, lineno, colno);
+        } else if (tok) {
+          return token(TOKEN_SYMBOL, tok, lineno, colno);
+        } else {
+          throw new Error('Unexpected value while parsing: ' + tok);
+        }
+      }
+    } else {
+      // Parse out the template text, breaking on tag
+      // delimiters because we need to look for block/variable start
+      // tags (don't use the full delimChars for optimization)
+      var beginChars = this.tags.BLOCK_START.charAt(0) + this.tags.VARIABLE_START.charAt(0) + this.tags.COMMENT_START.charAt(0) + this.tags.COMMENT_END.charAt(0);
+      if (this.isFinished()) {
+        return null;
+      } else if ((tok = this._extractString(this.tags.BLOCK_START + '-')) || (tok = this._extractString(this.tags.BLOCK_START))) {
+        this.in_code = true;
+        return token(TOKEN_BLOCK_START, tok, lineno, colno);
+      } else if ((tok = this._extractString(this.tags.VARIABLE_START + '-')) || (tok = this._extractString(this.tags.VARIABLE_START))) {
+        this.in_code = true;
+        return token(TOKEN_VARIABLE_START, tok, lineno, colno);
+      } else {
+        tok = '';
+        var data;
+        var inComment = false;
+        if (this._matches(this.tags.COMMENT_START)) {
+          inComment = true;
+          tok = this._extractString(this.tags.COMMENT_START);
+        }
+
+        // Continually consume text, breaking on the tag delimiter
+        // characters and checking to see if it's a start tag.
+        //
+        // We could hit the end of the template in the middle of
+        // our looping, so check for the null return value from
+        // _extractUntil
+        while ((data = this._extractUntil(beginChars)) !== null) {
+          tok += data;
+          if ((this._matches(this.tags.BLOCK_START) || this._matches(this.tags.VARIABLE_START) || this._matches(this.tags.COMMENT_START)) && !inComment) {
+            if (this.lstripBlocks && this._matches(this.tags.BLOCK_START) && this.colno > 0 && this.colno <= tok.length) {
+              var lastLine = tok.slice(-this.colno);
+              if (/^\s+$/.test(lastLine)) {
+                // Remove block leading whitespace from beginning of the string
+                tok = tok.slice(0, -this.colno);
+                if (!tok.length) {
+                  // All data removed, collapse to avoid unnecessary nodes
+                  // by returning next token (block start)
+                  return this.nextToken();
+                }
+              }
+            }
+            // If it is a start tag, stop looping
+            break;
+          } else if (this._matches(this.tags.COMMENT_END)) {
+            if (!inComment) {
+              throw new Error('unexpected end of comment');
+            }
+            tok += this._extractString(this.tags.COMMENT_END);
+            break;
+          } else {
+            // It does not match any tag, so add the character and
+            // carry on
+            tok += this.current();
+            this.forward();
+          }
+        }
+        if (data === null && inComment) {
+          throw new Error('expected end of comment, got end of file');
+        }
+        return token(inComment ? TOKEN_COMMENT : TOKEN_DATA, tok, lineno, colno);
+      }
+    }
+  };
+  _proto._parseString = function _parseString(delimiter) {
+    this.forward();
+    var str = '';
+    while (!this.isFinished() && this.current() !== delimiter) {
+      var cur = this.current();
+      if (cur === '\\') {
+        this.forward();
+        switch (this.current()) {
+          case 'n':
+            str += '\n';
+            break;
+          case 't':
+            str += '\t';
+            break;
+          case 'r':
+            str += '\r';
+            break;
+          default:
+            str += this.current();
+        }
+        this.forward();
+      } else {
+        str += cur;
+        this.forward();
+      }
+    }
+    this.forward();
+    return str;
+  };
+  _proto._matches = function _matches(str) {
+    if (this.index + str.length > this.len) {
+      return null;
+    }
+    var m = this.str.slice(this.index, this.index + str.length);
+    return m === str;
+  };
+  _proto._extractString = function _extractString(str) {
+    if (this._matches(str)) {
+      this.forwardN(str.length);
+      return str;
+    }
+    return null;
+  };
+  _proto._extractUntil = function _extractUntil(charString) {
+    // Extract all non-matching chars, with the default matching set
+    // to everything
+    return this._extractMatching(true, charString || '');
+  };
+  _proto._extract = function _extract(charString) {
+    // Extract all matching chars (no default, so charString must be
+    // explicit)
+    return this._extractMatching(false, charString);
+  };
+  _proto._extractMatching = function _extractMatching(breakOnMatch, charString) {
+    // Pull out characters until a breaking char is hit.
+    // If breakOnMatch is false, a non-matching char stops it.
+    // If breakOnMatch is true, a matching char stops it.
+
+    if (this.isFinished()) {
+      return null;
+    }
+    var first = charString.indexOf(this.current());
+
+    // Only proceed if the first character doesn't meet our condition
+    if (breakOnMatch && first === -1 || !breakOnMatch && first !== -1) {
+      var t = this.current();
+      this.forward();
+
+      // And pull out all the chars one at a time until we hit a
+      // breaking char
+      var idx = charString.indexOf(this.current());
+      while ((breakOnMatch && idx === -1 || !breakOnMatch && idx !== -1) && !this.isFinished()) {
+        t += this.current();
+        this.forward();
+        idx = charString.indexOf(this.current());
+      }
+      return t;
+    }
+    return '';
+  };
+  _proto._extractRegex = function _extractRegex(regex) {
+    var matches = this.currentStr().match(regex);
+    if (!matches) {
+      return null;
+    }
+
+    // Move forward whatever was matched
+    this.forwardN(matches[0].length);
+    return matches;
+  };
+  _proto.isFinished = function isFinished() {
+    return this.index >= this.len;
+  };
+  _proto.forwardN = function forwardN(n) {
+    for (var i = 0; i < n; i++) {
+      this.forward();
+    }
+  };
+  _proto.forward = function forward() {
+    this.index++;
+    if (this.previous() === '\n') {
+      this.lineno++;
+      this.colno = 0;
+    } else {
+      this.colno++;
+    }
+  };
+  _proto.backN = function backN(n) {
+    for (var i = 0; i < n; i++) {
+      this.back();
+    }
+  };
+  _proto.back = function back() {
+    this.index--;
+    if (this.current() === '\n') {
+      this.lineno--;
+      var idx = this.src.lastIndexOf('\n', this.index - 1);
+      if (idx === -1) {
+        this.colno = this.index;
+      } else {
+        this.colno = this.index - idx;
+      }
+    } else {
+      this.colno--;
+    }
+  }
+
+  // current returns current character
+  ;
+  _proto.current = function current() {
+    if (!this.isFinished()) {
+      return this.str.charAt(this.index);
+    }
+    return '';
+  }
+
+  // currentStr returns what's left of the unparsed string
+  ;
+  _proto.currentStr = function currentStr() {
+    if (!this.isFinished()) {
+      return this.str.substr(this.index);
+    }
+    return '';
+  };
+  _proto.previous = function previous() {
+    return this.str.charAt(this.index - 1);
+  };
+  return Tokenizer;
+}();
+module.exports = {
+  lex: function lex(src, opts) {
+    return new Tokenizer(src, opts);
+  },
+  TOKEN_STRING: TOKEN_STRING,
+  TOKEN_WHITESPACE: TOKEN_WHITESPACE,
+  TOKEN_DATA: TOKEN_DATA,
+  TOKEN_BLOCK_START: TOKEN_BLOCK_START,
+  TOKEN_BLOCK_END: TOKEN_BLOCK_END,
+  TOKEN_VARIABLE_START: TOKEN_VARIABLE_START,
+  TOKEN_VARIABLE_END: TOKEN_VARIABLE_END,
+  TOKEN_COMMENT: TOKEN_COMMENT,
+  TOKEN_LEFT_PAREN: TOKEN_LEFT_PAREN,
+  TOKEN_RIGHT_PAREN: TOKEN_RIGHT_PAREN,
+  TOKEN_LEFT_BRACKET: TOKEN_LEFT_BRACKET,
+  TOKEN_RIGHT_BRACKET: TOKEN_RIGHT_BRACKET,
+  TOKEN_LEFT_CURLY: TOKEN_LEFT_CURLY,
+  TOKEN_RIGHT_CURLY: TOKEN_RIGHT_CURLY,
+  TOKEN_OPERATOR: TOKEN_OPERATOR,
+  TOKEN_COMMA: TOKEN_COMMA,
+  TOKEN_COLON: TOKEN_COLON,
+  TOKEN_TILDE: TOKEN_TILDE,
+  TOKEN_PIPE: TOKEN_PIPE,
+  TOKEN_INT: TOKEN_INT,
+  TOKEN_FLOAT: TOKEN_FLOAT,
+  TOKEN_BOOLEAN: TOKEN_BOOLEAN,
+  TOKEN_NONE: TOKEN_NONE,
+  TOKEN_SYMBOL: TOKEN_SYMBOL,
+  TOKEN_SPECIAL: TOKEN_SPECIAL,
+  TOKEN_REGEX: TOKEN_REGEX
+};

book/node_modules/nunjucks/src/lib.js

@@ -0,0 +1,325 @@
+'use strict';
+
+var ArrayProto = Array.prototype;
+var ObjProto = Object.prototype;
+var escapeMap = {
+  '&': '&',
+  '"': '"',
+  '\'': ''',
+  '<': '&lt;',
+  '>': '&gt;',
+  '\\': '&#92;'
+};
+var escapeRegex = /[&"'<>\\]/g;
+var _exports = module.exports = {};
+function hasOwnProp(obj, k) {
+  return ObjProto.hasOwnProperty.call(obj, k);
+}
+_exports.hasOwnProp = hasOwnProp;
+function lookupEscape(ch) {
+  return escapeMap[ch];
+}
+function _prettifyError(path, withInternals, err) {
+  if (!err.Update) {
+    // not one of ours, cast it
+    err = new _exports.TemplateError(err);
+  }
+  err.Update(path);
+
+  // Unless they marked the dev flag, show them a trace from here
+  if (!withInternals) {
+    var old = err;
+    err = new Error(old.message);
+    err.name = old.name;
+  }
+  return err;
+}
+_exports._prettifyError = _prettifyError;
+function TemplateError(message, lineno, colno) {
+  var err;
+  var cause;
+  if (message instanceof Error) {
+    cause = message;
+    message = cause.name + ": " + cause.message;
+  }
+  if (Object.setPrototypeOf) {
+    err = new Error(message);
+    Object.setPrototypeOf(err, TemplateError.prototype);
+  } else {
+    err = this;
+    Object.defineProperty(err, 'message', {
+      enumerable: false,
+      writable: true,
+      value: message
+    });
+  }
+  Object.defineProperty(err, 'name', {
+    value: 'Template render error'
+  });
+  if (Error.captureStackTrace) {
+    Error.captureStackTrace(err, this.constructor);
+  }
+  var getStack;
+  if (cause) {
+    var stackDescriptor = Object.getOwnPropertyDescriptor(cause, 'stack');
+    getStack = stackDescriptor && (stackDescriptor.get || function () {
+      return stackDescriptor.value;
+    });
+    if (!getStack) {
+      getStack = function getStack() {
+        return cause.stack;
+      };
+    }
+  } else {
+    var stack = new Error(message).stack;
+    getStack = function getStack() {
+      return stack;
+    };
+  }
+  Object.defineProperty(err, 'stack', {
+    get: function get() {
+      return getStack.call(err);
+    }
+  });
+  Object.defineProperty(err, 'cause', {
+    value: cause
+  });
+  err.lineno = lineno;
+  err.colno = colno;
+  err.firstUpdate = true;
+  err.Update = function Update(path) {
+    var msg = '(' + (path || 'unknown path') + ')';
+
+    // only show lineno + colno next to path of template
+    // where error occurred
+    if (this.firstUpdate) {
+      if (this.lineno && this.colno) {
+        msg += " [Line " + this.lineno + ", Column " + this.colno + "]";
+      } else if (this.lineno) {
+        msg += " [Line " + this.lineno + "]";
+      }
+    }
+    msg += '\n ';
+    if (this.firstUpdate) {
+      msg += ' ';
+    }
+    this.message = msg + (this.message || '');
+    this.firstUpdate = false;
+    return this;
+  };
+  return err;
+}
+if (Object.setPrototypeOf) {
+  Object.setPrototypeOf(TemplateError.prototype, Error.prototype);
+} else {
+  TemplateError.prototype = Object.create(Error.prototype, {
+    constructor: {
+      value: TemplateError
+    }
+  });
+}
+_exports.TemplateError = TemplateError;
+function escape(val) {
+  return val.replace(escapeRegex, lookupEscape);
+}
+_exports.escape = escape;
+function isFunction(obj) {
+  return ObjProto.toString.call(obj) === '[object Function]';
+}
+_exports.isFunction = isFunction;
+function isArray(obj) {
+  return ObjProto.toString.call(obj) === '[object Array]';
+}
+_exports.isArray = isArray;
+function isString(obj) {
+  return ObjProto.toString.call(obj) === '[object String]';
+}
+_exports.isString = isString;
+function isObject(obj) {
+  return ObjProto.toString.call(obj) === '[object Object]';
+}
+_exports.isObject = isObject;
+
+/**
+ * @param {string|number} attr
+ * @returns {(string|number)[]}
+ * @private
+ */
+function _prepareAttributeParts(attr) {
+  if (!attr) {
+    return [];
+  }
+  if (typeof attr === 'string') {
+    return attr.split('.');
+  }
+  return [attr];
+}
+
+/**
+ * @param {string}   attribute      Attribute value. Dots allowed.
+ * @returns {function(Object): *}
+ */
+function getAttrGetter(attribute) {
+  var parts = _prepareAttributeParts(attribute);
+  return function attrGetter(item) {
+    var _item = item;
+    for (var i = 0; i < parts.length; i++) {
+      var part = parts[i];
+
+      // If item is not an object, and we still got parts to handle, it means
+      // that something goes wrong. Just roll out to undefined in that case.
+      if (hasOwnProp(_item, part)) {
+        _item = _item[part];
+      } else {
+        return undefined;
+      }
+    }
+    return _item;
+  };
+}
+_exports.getAttrGetter = getAttrGetter;
+function groupBy(obj, val, throwOnUndefined) {
+  var result = {};
+  var iterator = isFunction(val) ? val : getAttrGetter(val);
+  for (var i = 0; i < obj.length; i++) {
+    var value = obj[i];
+    var key = iterator(value, i);
+    if (key === undefined && throwOnUndefined === true) {
+      throw new TypeError("groupby: attribute \"" + val + "\" resolved to undefined");
+    }
+    (result[key] || (result[key] = [])).push(value);
+  }
+  return result;
+}
+_exports.groupBy = groupBy;
+function toArray(obj) {
+  return Array.prototype.slice.call(obj);
+}
+_exports.toArray = toArray;
+function without(array) {
+  var result = [];
+  if (!array) {
+    return result;
+  }
+  var length = array.length;
+  var contains = toArray(arguments).slice(1);
+  var index = -1;
+  while (++index < length) {
+    if (indexOf(contains, array[index]) === -1) {
+      result.push(array[index]);
+    }
+  }
+  return result;
+}
+_exports.without = without;
+function repeat(char_, n) {
+  var str = '';
+  for (var i = 0; i < n; i++) {
+    str += char_;
+  }
+  return str;
+}
+_exports.repeat = repeat;
+function each(obj, func, context) {
+  if (obj == null) {
+    return;
+  }
+  if (ArrayProto.forEach && obj.forEach === ArrayProto.forEach) {
+    obj.forEach(func, context);
+  } else if (obj.length === +obj.length) {
+    for (var i = 0, l = obj.length; i < l; i++) {
+      func.call(context, obj[i], i, obj);
+    }
+  }
+}
+_exports.each = each;
+function map(obj, func) {
+  var results = [];
+  if (obj == null) {
+    return results;
+  }
+  if (ArrayProto.map && obj.map === ArrayProto.map) {
+    return obj.map(func);
+  }
+  for (var i = 0; i < obj.length; i++) {
+    results[results.length] = func(obj[i], i);
+  }
+  if (obj.length === +obj.length) {
+    results.length = obj.length;
+  }
+  return results;
+}
+_exports.map = map;
+function asyncIter(arr, iter, cb) {
+  var i = -1;
+  function next() {
+    i++;
+    if (i < arr.length) {
+      iter(arr[i], i, next, cb);
+    } else {
+      cb();
+    }
+  }
+  next();
+}
+_exports.asyncIter = asyncIter;
+function asyncFor(obj, iter, cb) {
+  var keys = keys_(obj || {});
+  var len = keys.length;
+  var i = -1;
+  function next() {
+    i++;
+    var k = keys[i];
+    if (i < len) {
+      iter(k, obj[k], i, len, next);
+    } else {
+      cb();
+    }
+  }
+  next();
+}
+_exports.asyncFor = asyncFor;
+function indexOf(arr, searchElement, fromIndex) {
+  return Array.prototype.indexOf.call(arr || [], searchElement, fromIndex);
+}
+_exports.indexOf = indexOf;
+function keys_(obj) {
+  /* eslint-disable no-restricted-syntax */
+  var arr = [];
+  for (var k in obj) {
+    if (hasOwnProp(obj, k)) {
+      arr.push(k);
+    }
+  }
+  return arr;
+}
+_exports.keys = keys_;
+function _entries(obj) {
+  return keys_(obj).map(function (k) {
+    return [k, obj[k]];
+  });
+}
+_exports._entries = _entries;
+function _values(obj) {
+  return keys_(obj).map(function (k) {
+    return obj[k];
+  });
+}
+_exports._values = _values;
+function extend(obj1, obj2) {
+  obj1 = obj1 || {};
+  keys_(obj2).forEach(function (k) {
+    obj1[k] = obj2[k];
+  });
+  return obj1;
+}
+_exports._assign = _exports.extend = extend;
+function inOperator(key, val) {
+  if (isArray(val) || isString(val)) {
+    return val.indexOf(key) !== -1;
+  } else if (isObject(val)) {
+    return key in val;
+  }
+  throw new Error('Cannot use "in" operator to search for "' + key + '" in unexpected types.');
+}
+_exports.inOperator = inOperator;

book/node_modules/nunjucks/src/loader.js

@@ -0,0 +1,21 @@
+'use strict';
+
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var path = require('path');
+var _require = require('./object'),
+  EmitterObj = _require.EmitterObj;
+module.exports = /*#__PURE__*/function (_EmitterObj) {
+  _inheritsLoose(Loader, _EmitterObj);
+  function Loader() {
+    return _EmitterObj.apply(this, arguments) || this;
+  }
+  var _proto = Loader.prototype;
+  _proto.resolve = function resolve(from, to) {
+    return path.resolve(path.dirname(from), to);
+  };
+  _proto.isRelative = function isRelative(filename) {
+    return filename.indexOf('./') === 0 || filename.indexOf('../') === 0;
+  };
+  return Loader;
+}(EmitterObj);

book/node_modules/nunjucks/src/loaders.js

@@ -0,0 +1,5 @@
+"use strict";
+
+// This file will automatically be rewired to web-loader.js when
+// building for the browser
+module.exports = require('./node-loaders');

book/node_modules/nunjucks/src/node-loaders.js

@@ -0,0 +1,139 @@
+/* eslint-disable no-console */
+
+'use strict';
+
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var fs = require('fs');
+var path = require('path');
+var Loader = require('./loader');
+var _require = require('./precompiled-loader.js'),
+  PrecompiledLoader = _require.PrecompiledLoader;
+var chokidar;
+var FileSystemLoader = /*#__PURE__*/function (_Loader) {
+  _inheritsLoose(FileSystemLoader, _Loader);
+  function FileSystemLoader(searchPaths, opts) {
+    var _this;
+    _this = _Loader.call(this) || this;
+    if (typeof opts === 'boolean') {
+      console.log('[nunjucks] Warning: you passed a boolean as the second ' + 'argument to FileSystemLoader, but it now takes an options ' + 'object. See http://mozilla.github.io/nunjucks/api.html#filesystemloader');
+    }
+    opts = opts || {};
+    _this.pathsToNames = {};
+    _this.noCache = !!opts.noCache;
+    if (searchPaths) {
+      searchPaths = Array.isArray(searchPaths) ? searchPaths : [searchPaths];
+      // For windows, convert to forward slashes
+      _this.searchPaths = searchPaths.map(path.normalize);
+    } else {
+      _this.searchPaths = ['.'];
+    }
+    if (opts.watch) {
+      // Watch all the templates in the paths and fire an event when
+      // they change
+      try {
+        chokidar = require('chokidar'); // eslint-disable-line global-require
+      } catch (e) {
+        throw new Error('watch requires chokidar to be installed');
+      }
+      var paths = _this.searchPaths.filter(fs.existsSync);
+      var watcher = chokidar.watch(paths);
+      watcher.on('all', function (event, fullname) {
+        fullname = path.resolve(fullname);
+        if (event === 'change' && fullname in _this.pathsToNames) {
+          _this.emit('update', _this.pathsToNames[fullname], fullname);
+        }
+      });
+      watcher.on('error', function (error) {
+        console.log('Watcher error: ' + error);
+      });
+    }
+    return _this;
+  }
+  var _proto = FileSystemLoader.prototype;
+  _proto.getSource = function getSource(name) {
+    var fullpath = null;
+    var paths = this.searchPaths;
+    for (var i = 0; i < paths.length; i++) {
+      var basePath = path.resolve(paths[i]);
+      var p = path.resolve(paths[i], name);
+
+      // Only allow the current directory and anything
+      // underneath it to be searched
+      if (p.indexOf(basePath) === 0 && fs.existsSync(p)) {
+        fullpath = p;
+        break;
+      }
+    }
+    if (!fullpath) {
+      return null;
+    }
+    this.pathsToNames[fullpath] = name;
+    var source = {
+      src: fs.readFileSync(fullpath, 'utf-8'),
+      path: fullpath,
+      noCache: this.noCache
+    };
+    this.emit('load', name, source);
+    return source;
+  };
+  return FileSystemLoader;
+}(Loader);
+var NodeResolveLoader = /*#__PURE__*/function (_Loader2) {
+  _inheritsLoose(NodeResolveLoader, _Loader2);
+  function NodeResolveLoader(opts) {
+    var _this2;
+    _this2 = _Loader2.call(this) || this;
+    opts = opts || {};
+    _this2.pathsToNames = {};
+    _this2.noCache = !!opts.noCache;
+    if (opts.watch) {
+      try {
+        chokidar = require('chokidar'); // eslint-disable-line global-require
+      } catch (e) {
+        throw new Error('watch requires chokidar to be installed');
+      }
+      _this2.watcher = chokidar.watch();
+      _this2.watcher.on('change', function (fullname) {
+        _this2.emit('update', _this2.pathsToNames[fullname], fullname);
+      });
+      _this2.watcher.on('error', function (error) {
+        console.log('Watcher error: ' + error);
+      });
+      _this2.on('load', function (name, source) {
+        _this2.watcher.add(source.path);
+      });
+    }
+    return _this2;
+  }
+  var _proto2 = NodeResolveLoader.prototype;
+  _proto2.getSource = function getSource(name) {
+    // Don't allow file-system traversal
+    if (/^\.?\.?(\/|\\)/.test(name)) {
+      return null;
+    }
+    if (/^[A-Z]:/.test(name)) {
+      return null;
+    }
+    var fullpath;
+    try {
+      fullpath = require.resolve(name);
+    } catch (e) {
+      return null;
+    }
+    this.pathsToNames[fullpath] = name;
+    var source = {
+      src: fs.readFileSync(fullpath, 'utf-8'),
+      path: fullpath,
+      noCache: this.noCache
+    };
+    this.emit('load', name, source);
+    return source;
+  };
+  return NodeResolveLoader;
+}(Loader);
+module.exports = {
+  FileSystemLoader: FileSystemLoader,
+  PrecompiledLoader: PrecompiledLoader,
+  NodeResolveLoader: NodeResolveLoader
+};

book/node_modules/nunjucks/src/nodes.js

@@ -0,0 +1,350 @@
+'use strict';
+
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
+function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return typeof key === "symbol" ? key : String(key); }
+function _toPrimitive(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var _require = require('./object'),
+  Obj = _require.Obj;
+function traverseAndCheck(obj, type, results) {
+  if (obj instanceof type) {
+    results.push(obj);
+  }
+  if (obj instanceof Node) {
+    obj.findAll(type, results);
+  }
+}
+var Node = /*#__PURE__*/function (_Obj) {
+  _inheritsLoose(Node, _Obj);
+  function Node() {
+    return _Obj.apply(this, arguments) || this;
+  }
+  var _proto = Node.prototype;
+  _proto.init = function init(lineno, colno) {
+    var _arguments = arguments,
+      _this = this;
+    for (var _len = arguments.length, args = new Array(_len > 2 ? _len - 2 : 0), _key = 2; _key < _len; _key++) {
+      args[_key - 2] = arguments[_key];
+    }
+    this.lineno = lineno;
+    this.colno = colno;
+    this.fields.forEach(function (field, i) {
+      // The first two args are line/col numbers, so offset by 2
+      var val = _arguments[i + 2];
+
+      // Fields should never be undefined, but null. It makes
+      // testing easier to normalize values.
+      if (val === undefined) {
+        val = null;
+      }
+      _this[field] = val;
+    });
+  };
+  _proto.findAll = function findAll(type, results) {
+    var _this2 = this;
+    results = results || [];
+    if (this instanceof NodeList) {
+      this.children.forEach(function (child) {
+        return traverseAndCheck(child, type, results);
+      });
+    } else {
+      this.fields.forEach(function (field) {
+        return traverseAndCheck(_this2[field], type, results);
+      });
+    }
+    return results;
+  };
+  _proto.iterFields = function iterFields(func) {
+    var _this3 = this;
+    this.fields.forEach(function (field) {
+      func(_this3[field], field);
+    });
+  };
+  return Node;
+}(Obj); // Abstract nodes
+var Value = /*#__PURE__*/function (_Node) {
+  _inheritsLoose(Value, _Node);
+  function Value() {
+    return _Node.apply(this, arguments) || this;
+  }
+  _createClass(Value, [{
+    key: "typename",
+    get: function get() {
+      return 'Value';
+    }
+  }, {
+    key: "fields",
+    get: function get() {
+      return ['value'];
+    }
+  }]);
+  return Value;
+}(Node); // Concrete nodes
+var NodeList = /*#__PURE__*/function (_Node2) {
+  _inheritsLoose(NodeList, _Node2);
+  function NodeList() {
+    return _Node2.apply(this, arguments) || this;
+  }
+  var _proto2 = NodeList.prototype;
+  _proto2.init = function init(lineno, colno, nodes) {
+    _Node2.prototype.init.call(this, lineno, colno, nodes || []);
+  };
+  _proto2.addChild = function addChild(node) {
+    this.children.push(node);
+  };
+  _createClass(NodeList, [{
+    key: "typename",
+    get: function get() {
+      return 'NodeList';
+    }
+  }, {
+    key: "fields",
+    get: function get() {
+      return ['children'];
+    }
+  }]);
+  return NodeList;
+}(Node);
+var Root = NodeList.extend('Root');
+var Literal = Value.extend('Literal');
+var _Symbol = Value.extend('Symbol');
+var Group = NodeList.extend('Group');
+var ArrayNode = NodeList.extend('Array');
+var Pair = Node.extend('Pair', {
+  fields: ['key', 'value']
+});
+var Dict = NodeList.extend('Dict');
+var LookupVal = Node.extend('LookupVal', {
+  fields: ['target', 'val']
+});
+var If = Node.extend('If', {
+  fields: ['cond', 'body', 'else_']
+});
+var IfAsync = If.extend('IfAsync');
+var InlineIf = Node.extend('InlineIf', {
+  fields: ['cond', 'body', 'else_']
+});
+var For = Node.extend('For', {
+  fields: ['arr', 'name', 'body', 'else_']
+});
+var AsyncEach = For.extend('AsyncEach');
+var AsyncAll = For.extend('AsyncAll');
+var Macro = Node.extend('Macro', {
+  fields: ['name', 'args', 'body']
+});
+var Caller = Macro.extend('Caller');
+var Import = Node.extend('Import', {
+  fields: ['template', 'target', 'withContext']
+});
+var FromImport = /*#__PURE__*/function (_Node3) {
+  _inheritsLoose(FromImport, _Node3);
+  function FromImport() {
+    return _Node3.apply(this, arguments) || this;
+  }
+  var _proto3 = FromImport.prototype;
+  _proto3.init = function init(lineno, colno, template, names, withContext) {
+    _Node3.prototype.init.call(this, lineno, colno, template, names || new NodeList(), withContext);
+  };
+  _createClass(FromImport, [{
+    key: "typename",
+    get: function get() {
+      return 'FromImport';
+    }
+  }, {
+    key: "fields",
+    get: function get() {
+      return ['template', 'names', 'withContext'];
+    }
+  }]);
+  return FromImport;
+}(Node);
+var FunCall = Node.extend('FunCall', {
+  fields: ['name', 'args']
+});
+var Filter = FunCall.extend('Filter');
+var FilterAsync = Filter.extend('FilterAsync', {
+  fields: ['name', 'args', 'symbol']
+});
+var KeywordArgs = Dict.extend('KeywordArgs');
+var Block = Node.extend('Block', {
+  fields: ['name', 'body']
+});
+var Super = Node.extend('Super', {
+  fields: ['blockName', 'symbol']
+});
+var TemplateRef = Node.extend('TemplateRef', {
+  fields: ['template']
+});
+var Extends = TemplateRef.extend('Extends');
+var Include = Node.extend('Include', {
+  fields: ['template', 'ignoreMissing']
+});
+var Set = Node.extend('Set', {
+  fields: ['targets', 'value']
+});
+var Switch = Node.extend('Switch', {
+  fields: ['expr', 'cases', 'default']
+});
+var Case = Node.extend('Case', {
+  fields: ['cond', 'body']
+});
+var Output = NodeList.extend('Output');
+var Capture = Node.extend('Capture', {
+  fields: ['body']
+});
+var TemplateData = Literal.extend('TemplateData');
+var UnaryOp = Node.extend('UnaryOp', {
+  fields: ['target']
+});
+var BinOp = Node.extend('BinOp', {
+  fields: ['left', 'right']
+});
+var In = BinOp.extend('In');
+var Is = BinOp.extend('Is');
+var Or = BinOp.extend('Or');
+var And = BinOp.extend('And');
+var Not = UnaryOp.extend('Not');
+var Add = BinOp.extend('Add');
+var Concat = BinOp.extend('Concat');
+var Sub = BinOp.extend('Sub');
+var Mul = BinOp.extend('Mul');
+var Div = BinOp.extend('Div');
+var FloorDiv = BinOp.extend('FloorDiv');
+var Mod = BinOp.extend('Mod');
+var Pow = BinOp.extend('Pow');
+var Neg = UnaryOp.extend('Neg');
+var Pos = UnaryOp.extend('Pos');
+var Compare = Node.extend('Compare', {
+  fields: ['expr', 'ops']
+});
+var CompareOperand = Node.extend('CompareOperand', {
+  fields: ['expr', 'type']
+});
+var CallExtension = Node.extend('CallExtension', {
+  init: function init(ext, prop, args, contentArgs) {
+    this.parent();
+    this.extName = ext.__name || ext;
+    this.prop = prop;
+    this.args = args || new NodeList();
+    this.contentArgs = contentArgs || [];
+    this.autoescape = ext.autoescape;
+  },
+  fields: ['extName', 'prop', 'args', 'contentArgs']
+});
+var CallExtensionAsync = CallExtension.extend('CallExtensionAsync');
+
+// This is hacky, but this is just a debugging function anyway
+function print(str, indent, inline) {
+  var lines = str.split('\n');
+  lines.forEach(function (line, i) {
+    if (line && (inline && i > 0 || !inline)) {
+      process.stdout.write(' '.repeat(indent));
+    }
+    var nl = i === lines.length - 1 ? '' : '\n';
+    process.stdout.write("" + line + nl);
+  });
+}
+
+// Print the AST in a nicely formatted tree format for debuggin
+function printNodes(node, indent) {
+  indent = indent || 0;
+  print(node.typename + ': ', indent);
+  if (node instanceof NodeList) {
+    print('\n');
+    node.children.forEach(function (n) {
+      printNodes(n, indent + 2);
+    });
+  } else if (node instanceof CallExtension) {
+    print(node.extName + "." + node.prop + "\n");
+    if (node.args) {
+      printNodes(node.args, indent + 2);
+    }
+    if (node.contentArgs) {
+      node.contentArgs.forEach(function (n) {
+        printNodes(n, indent + 2);
+      });
+    }
+  } else {
+    var nodes = [];
+    var props = null;
+    node.iterFields(function (val, fieldName) {
+      if (val instanceof Node) {
+        nodes.push([fieldName, val]);
+      } else {
+        props = props || {};
+        props[fieldName] = val;
+      }
+    });
+    if (props) {
+      print(JSON.stringify(props, null, 2) + '\n', null, true);
+    } else {
+      print('\n');
+    }
+    nodes.forEach(function (_ref) {
+      var fieldName = _ref[0],
+        n = _ref[1];
+      print("[" + fieldName + "] =>", indent + 2);
+      printNodes(n, indent + 4);
+    });
+  }
+}
+module.exports = {
+  Node: Node,
+  Root: Root,
+  NodeList: NodeList,
+  Value: Value,
+  Literal: Literal,
+  Symbol: _Symbol,
+  Group: Group,
+  Array: ArrayNode,
+  Pair: Pair,
+  Dict: Dict,
+  Output: Output,
+  Capture: Capture,
+  TemplateData: TemplateData,
+  If: If,
+  IfAsync: IfAsync,
+  InlineIf: InlineIf,
+  For: For,
+  AsyncEach: AsyncEach,
+  AsyncAll: AsyncAll,
+  Macro: Macro,
+  Caller: Caller,
+  Import: Import,
+  FromImport: FromImport,
+  FunCall: FunCall,
+  Filter: Filter,
+  FilterAsync: FilterAsync,
+  KeywordArgs: KeywordArgs,
+  Block: Block,
+  Super: Super,
+  Extends: Extends,
+  Include: Include,
+  Set: Set,
+  Switch: Switch,
+  Case: Case,
+  LookupVal: LookupVal,
+  BinOp: BinOp,
+  In: In,
+  Is: Is,
+  Or: Or,
+  And: And,
+  Not: Not,
+  Add: Add,
+  Concat: Concat,
+  Sub: Sub,
+  Mul: Mul,
+  Div: Div,
+  FloorDiv: FloorDiv,
+  Mod: Mod,
+  Pow: Pow,
+  Neg: Neg,
+  Pos: Pos,
+  Compare: Compare,
+  CompareOperand: CompareOperand,
+  CallExtension: CallExtension,
+  CallExtensionAsync: CallExtensionAsync,
+  printNodes: printNodes
+};

book/node_modules/nunjucks/src/object.js

@@ -0,0 +1,100 @@
+'use strict';
+
+// A simple class system, more documentation to come
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
+function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return typeof key === "symbol" ? key : String(key); }
+function _toPrimitive(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var EventEmitter = require('events');
+var lib = require('./lib');
+function parentWrap(parent, prop) {
+  if (typeof parent !== 'function' || typeof prop !== 'function') {
+    return prop;
+  }
+  return function wrap() {
+    // Save the current parent method
+    var tmp = this.parent;
+
+    // Set parent to the previous method, call, and restore
+    this.parent = parent;
+    var res = prop.apply(this, arguments);
+    this.parent = tmp;
+    return res;
+  };
+}
+function extendClass(cls, name, props) {
+  props = props || {};
+  lib.keys(props).forEach(function (k) {
+    props[k] = parentWrap(cls.prototype[k], props[k]);
+  });
+  var subclass = /*#__PURE__*/function (_cls) {
+    _inheritsLoose(subclass, _cls);
+    function subclass() {
+      return _cls.apply(this, arguments) || this;
+    }
+    _createClass(subclass, [{
+      key: "typename",
+      get: function get() {
+        return name;
+      }
+    }]);
+    return subclass;
+  }(cls);
+  lib._assign(subclass.prototype, props);
+  return subclass;
+}
+var Obj = /*#__PURE__*/function () {
+  function Obj() {
+    // Unfortunately necessary for backwards compatibility
+    this.init.apply(this, arguments);
+  }
+  var _proto = Obj.prototype;
+  _proto.init = function init() {};
+  Obj.extend = function extend(name, props) {
+    if (typeof name === 'object') {
+      props = name;
+      name = 'anonymous';
+    }
+    return extendClass(this, name, props);
+  };
+  _createClass(Obj, [{
+    key: "typename",
+    get: function get() {
+      return this.constructor.name;
+    }
+  }]);
+  return Obj;
+}();
+var EmitterObj = /*#__PURE__*/function (_EventEmitter) {
+  _inheritsLoose(EmitterObj, _EventEmitter);
+  function EmitterObj() {
+    var _this2;
+    var _this;
+    _this = _EventEmitter.call(this) || this;
+    // Unfortunately necessary for backwards compatibility
+    (_this2 = _this).init.apply(_this2, arguments);
+    return _this;
+  }
+  var _proto2 = EmitterObj.prototype;
+  _proto2.init = function init() {};
+  EmitterObj.extend = function extend(name, props) {
+    if (typeof name === 'object') {
+      props = name;
+      name = 'anonymous';
+    }
+    return extendClass(this, name, props);
+  };
+  _createClass(EmitterObj, [{
+    key: "typename",
+    get: function get() {
+      return this.constructor.name;
+    }
+  }]);
+  return EmitterObj;
+}(EventEmitter);
+module.exports = {
+  Obj: Obj,
+  EmitterObj: EmitterObj
+};

book/node_modules/nunjucks/src/precompile-global.js

@@ -0,0 +1,17 @@
+'use strict';
+
+function precompileGlobal(templates, opts) {
+  var out = '';
+  opts = opts || {};
+  for (var i = 0; i < templates.length; i++) {
+    var name = JSON.stringify(templates[i].name);
+    var template = templates[i].template;
+    out += '(function() {' + '(window.nunjucksPrecompiled = window.nunjucksPrecompiled || {})' + '[' + name + '] = (function() {\n' + template + '\n})();\n';
+    if (opts.asFunction) {
+      out += 'return function(ctx, cb) { return nunjucks.render(' + name + ', ctx, cb); }\n';
+    }
+    out += '})();\n';
+  }
+  return out;
+}
+module.exports = precompileGlobal;

book/node_modules/nunjucks/src/precompile.js

@@ -0,0 +1,108 @@
+'use strict';
+
+var fs = require('fs');
+var path = require('path');
+var _require = require('./lib'),
+  _prettifyError = _require._prettifyError;
+var compiler = require('./compiler');
+var _require2 = require('./environment'),
+  Environment = _require2.Environment;
+var precompileGlobal = require('./precompile-global');
+function match(filename, patterns) {
+  if (!Array.isArray(patterns)) {
+    return false;
+  }
+  return patterns.some(function (pattern) {
+    return filename.match(pattern);
+  });
+}
+function precompileString(str, opts) {
+  opts = opts || {};
+  opts.isString = true;
+  var env = opts.env || new Environment([]);
+  var wrapper = opts.wrapper || precompileGlobal;
+  if (!opts.name) {
+    throw new Error('the "name" option is required when compiling a string');
+  }
+  return wrapper([_precompile(str, opts.name, env)], opts);
+}
+function precompile(input, opts) {
+  // The following options are available:
+  //
+  // * name: name of the template (auto-generated when compiling a directory)
+  // * isString: input is a string, not a file path
+  // * asFunction: generate a callable function
+  // * force: keep compiling on error
+  // * env: the Environment to use (gets extensions and async filters from it)
+  // * include: which file/folders to include (folders are auto-included, files are auto-excluded)
+  // * exclude: which file/folders to exclude (folders are auto-included, files are auto-excluded)
+  // * wrapper: function(templates, opts) {...}
+  //       Customize the output format to store the compiled template.
+  //       By default, templates are stored in a global variable used by the runtime.
+  //       A custom loader will be necessary to load your custom wrapper.
+
+  opts = opts || {};
+  var env = opts.env || new Environment([]);
+  var wrapper = opts.wrapper || precompileGlobal;
+  if (opts.isString) {
+    return precompileString(input, opts);
+  }
+  var pathStats = fs.existsSync(input) && fs.statSync(input);
+  var precompiled = [];
+  var templates = [];
+  function addTemplates(dir) {
+    fs.readdirSync(dir).forEach(function (file) {
+      var filepath = path.join(dir, file);
+      var subpath = filepath.substr(path.join(input, '/').length);
+      var stat = fs.statSync(filepath);
+      if (stat && stat.isDirectory()) {
+        subpath += '/';
+        if (!match(subpath, opts.exclude)) {
+          addTemplates(filepath);
+        }
+      } else if (match(subpath, opts.include)) {
+        templates.push(filepath);
+      }
+    });
+  }
+  if (pathStats.isFile()) {
+    precompiled.push(_precompile(fs.readFileSync(input, 'utf-8'), opts.name || input, env));
+  } else if (pathStats.isDirectory()) {
+    addTemplates(input);
+    for (var i = 0; i < templates.length; i++) {
+      var name = templates[i].replace(path.join(input, '/'), '');
+      try {
+        precompiled.push(_precompile(fs.readFileSync(templates[i], 'utf-8'), name, env));
+      } catch (e) {
+        if (opts.force) {
+          // Don't stop generating the output if we're
+          // forcing compilation.
+          console.error(e); // eslint-disable-line no-console
+        } else {
+          throw e;
+        }
+      }
+    }
+  }
+  return wrapper(precompiled, opts);
+}
+function _precompile(str, name, env) {
+  env = env || new Environment([]);
+  var asyncFilters = env.asyncFilters;
+  var extensions = env.extensionsList;
+  var template;
+  name = name.replace(/\\/g, '/');
+  try {
+    template = compiler.compile(str, asyncFilters, extensions, name, env.opts);
+  } catch (err) {
+    throw _prettifyError(name, false, err);
+  }
+  return {
+    name: name,
+    template: template
+  };
+}
+module.exports = {
+  precompile: precompile,
+  precompileString: precompileString
+};

book/node_modules/nunjucks/src/precompiled-loader.js

@@ -0,0 +1,31 @@
+'use strict';
+
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var Loader = require('./loader');
+var PrecompiledLoader = /*#__PURE__*/function (_Loader) {
+  _inheritsLoose(PrecompiledLoader, _Loader);
+  function PrecompiledLoader(compiledTemplates) {
+    var _this;
+    _this = _Loader.call(this) || this;
+    _this.precompiled = compiledTemplates || {};
+    return _this;
+  }
+  var _proto = PrecompiledLoader.prototype;
+  _proto.getSource = function getSource(name) {
+    if (this.precompiled[name]) {
+      return {
+        src: {
+          type: 'code',
+          obj: this.precompiled[name]
+        },
+        path: name
+      };
+    }
+    return null;
+  };
+  return PrecompiledLoader;
+}(Loader);
+module.exports = {
+  PrecompiledLoader: PrecompiledLoader
+};

book/node_modules/nunjucks/src/runtime.js

@@ -0,0 +1,333 @@
+'use strict';
+
+var lib = require('./lib');
+var arrayFrom = Array.from;
+var supportsIterators = typeof Symbol === 'function' && Symbol.iterator && typeof arrayFrom === 'function';
+
+// Frames keep track of scoping both at compile-time and run-time so
+// we know how to access variables. Block tags can introduce special
+// variables, for example.
+var Frame = /*#__PURE__*/function () {
+  function Frame(parent, isolateWrites) {
+    this.variables = Object.create(null);
+    this.parent = parent;
+    this.topLevel = false;
+    // if this is true, writes (set) should never propagate upwards past
+    // this frame to its parent (though reads may).
+    this.isolateWrites = isolateWrites;
+  }
+  var _proto = Frame.prototype;
+  _proto.set = function set(name, val, resolveUp) {
+    // Allow variables with dots by automatically creating the
+    // nested structure
+    var parts = name.split('.');
+    var obj = this.variables;
+    var frame = this;
+    if (resolveUp) {
+      if (frame = this.resolve(parts[0], true)) {
+        frame.set(name, val);
+        return;
+      }
+    }
+    for (var i = 0; i < parts.length - 1; i++) {
+      var id = parts[i];
+      if (!obj[id]) {
+        obj[id] = {};
+      }
+      obj = obj[id];
+    }
+    obj[parts[parts.length - 1]] = val;
+  };
+  _proto.get = function get(name) {
+    var val = this.variables[name];
+    if (val !== undefined) {
+      return val;
+    }
+    return null;
+  };
+  _proto.lookup = function lookup(name) {
+    var p = this.parent;
+    var val = this.variables[name];
+    if (val !== undefined) {
+      return val;
+    }
+    return p && p.lookup(name);
+  };
+  _proto.resolve = function resolve(name, forWrite) {
+    var p = forWrite && this.isolateWrites ? undefined : this.parent;
+    var val = this.variables[name];
+    if (val !== undefined) {
+      return this;
+    }
+    return p && p.resolve(name);
+  };
+  _proto.push = function push(isolateWrites) {
+    return new Frame(this, isolateWrites);
+  };
+  _proto.pop = function pop() {
+    return this.parent;
+  };
+  return Frame;
+}();
+function makeMacro(argNames, kwargNames, func) {
+  return function macro() {
+    for (var _len = arguments.length, macroArgs = new Array(_len), _key = 0; _key < _len; _key++) {
+      macroArgs[_key] = arguments[_key];
+    }
+    var argCount = numArgs(macroArgs);
+    var args;
+    var kwargs = getKeywordArgs(macroArgs);
+    if (argCount > argNames.length) {
+      args = macroArgs.slice(0, argNames.length);
+
+      // Positional arguments that should be passed in as
+      // keyword arguments (essentially default values)
+      macroArgs.slice(args.length, argCount).forEach(function (val, i) {
+        if (i < kwargNames.length) {
+          kwargs[kwargNames[i]] = val;
+        }
+      });
+      args.push(kwargs);
+    } else if (argCount < argNames.length) {
+      args = macroArgs.slice(0, argCount);
+      for (var i = argCount; i < argNames.length; i++) {
+        var arg = argNames[i];
+
+        // Keyword arguments that should be passed as
+        // positional arguments, i.e. the caller explicitly
+        // used the name of a positional arg
+        args.push(kwargs[arg]);
+        delete kwargs[arg];
+      }
+      args.push(kwargs);
+    } else {
+      args = macroArgs;
+    }
+    return func.apply(this, args);
+  };
+}
+function makeKeywordArgs(obj) {
+  obj.__keywords = true;
+  return obj;
+}
+function isKeywordArgs(obj) {
+  return obj && Object.prototype.hasOwnProperty.call(obj, '__keywords');
+}
+function getKeywordArgs(args) {
+  var len = args.length;
+  if (len) {
+    var lastArg = args[len - 1];
+    if (isKeywordArgs(lastArg)) {
+      return lastArg;
+    }
+  }
+  return {};
+}
+function numArgs(args) {
+  var len = args.length;
+  if (len === 0) {
+    return 0;
+  }
+  var lastArg = args[len - 1];
+  if (isKeywordArgs(lastArg)) {
+    return len - 1;
+  } else {
+    return len;
+  }
+}
+
+// A SafeString object indicates that the string should not be
+// autoescaped. This happens magically because autoescaping only
+// occurs on primitive string objects.
+function SafeString(val) {
+  if (typeof val !== 'string') {
+    return val;
+  }
+  this.val = val;
+  this.length = val.length;
+}
+SafeString.prototype = Object.create(String.prototype, {
+  length: {
+    writable: true,
+    configurable: true,
+    value: 0
+  }
+});
+SafeString.prototype.valueOf = function valueOf() {
+  return this.val;
+};
+SafeString.prototype.toString = function toString() {
+  return this.val;
+};
+function copySafeness(dest, target) {
+  if (dest instanceof SafeString) {
+    return new SafeString(target);
+  }
+  return target.toString();
+}
+function markSafe(val) {
+  var type = typeof val;
+  if (type === 'string') {
+    return new SafeString(val);
+  } else if (type !== 'function') {
+    return val;
+  } else {
+    return function wrapSafe(args) {
+      var ret = val.apply(this, arguments);
+      if (typeof ret === 'string') {
+        return new SafeString(ret);
+      }
+      return ret;
+    };
+  }
+}
+function suppressValue(val, autoescape) {
+  val = val !== undefined && val !== null ? val : '';
+  if (autoescape && !(val instanceof SafeString)) {
+    val = lib.escape(val.toString());
+  }
+  return val;
+}
+function ensureDefined(val, lineno, colno) {
+  if (val === null || val === undefined) {
+    throw new lib.TemplateError('attempted to output null or undefined value', lineno + 1, colno + 1);
+  }
+  return val;
+}
+function memberLookup(obj, val) {
+  if (obj === undefined || obj === null) {
+    return undefined;
+  }
+  if (typeof obj[val] === 'function') {
+    return function () {
+      for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
+        args[_key2] = arguments[_key2];
+      }
+      return obj[val].apply(obj, args);
+    };
+  }
+  return obj[val];
+}
+function callWrap(obj, name, context, args) {
+  if (!obj) {
+    throw new Error('Unable to call `' + name + '`, which is undefined or falsey');
+  } else if (typeof obj !== 'function') {
+    throw new Error('Unable to call `' + name + '`, which is not a function');
+  }
+  return obj.apply(context, args);
+}
+function contextOrFrameLookup(context, frame, name) {
+  var val = frame.lookup(name);
+  return val !== undefined ? val : context.lookup(name);
+}
+function handleError(error, lineno, colno) {
+  if (error.lineno) {
+    return error;
+  } else {
+    return new lib.TemplateError(error, lineno, colno);
+  }
+}
+function asyncEach(arr, dimen, iter, cb) {
+  if (lib.isArray(arr)) {
+    var len = arr.length;
+    lib.asyncIter(arr, function iterCallback(item, i, next) {
+      switch (dimen) {
+        case 1:
+          iter(item, i, len, next);
+          break;
+        case 2:
+          iter(item[0], item[1], i, len, next);
+          break;
+        case 3:
+          iter(item[0], item[1], item[2], i, len, next);
+          break;
+        default:
+          item.push(i, len, next);
+          iter.apply(this, item);
+      }
+    }, cb);
+  } else {
+    lib.asyncFor(arr, function iterCallback(key, val, i, len, next) {
+      iter(key, val, i, len, next);
+    }, cb);
+  }
+}
+function asyncAll(arr, dimen, func, cb) {
+  var finished = 0;
+  var len;
+  var outputArr;
+  function done(i, output) {
+    finished++;
+    outputArr[i] = output;
+    if (finished === len) {
+      cb(null, outputArr.join(''));
+    }
+  }
+  if (lib.isArray(arr)) {
+    len = arr.length;
+    outputArr = new Array(len);
+    if (len === 0) {
+      cb(null, '');
+    } else {
+      for (var i = 0; i < arr.length; i++) {
+        var item = arr[i];
+        switch (dimen) {
+          case 1:
+            func(item, i, len, done);
+            break;
+          case 2:
+            func(item[0], item[1], i, len, done);
+            break;
+          case 3:
+            func(item[0], item[1], item[2], i, len, done);
+            break;
+          default:
+            item.push(i, len, done);
+            func.apply(this, item);
+        }
+      }
+    }
+  } else {
+    var keys = lib.keys(arr || {});
+    len = keys.length;
+    outputArr = new Array(len);
+    if (len === 0) {
+      cb(null, '');
+    } else {
+      for (var _i = 0; _i < keys.length; _i++) {
+        var k = keys[_i];
+        func(k, arr[k], _i, len, done);
+      }
+    }
+  }
+}
+function fromIterator(arr) {
+  if (typeof arr !== 'object' || arr === null || lib.isArray(arr)) {
+    return arr;
+  } else if (supportsIterators && Symbol.iterator in arr) {
+    return arrayFrom(arr);
+  } else {
+    return arr;
+  }
+}
+module.exports = {
+  Frame: Frame,
+  makeMacro: makeMacro,
+  makeKeywordArgs: makeKeywordArgs,
+  numArgs: numArgs,
+  suppressValue: suppressValue,
+  ensureDefined: ensureDefined,
+  memberLookup: memberLookup,
+  contextOrFrameLookup: contextOrFrameLookup,
+  callWrap: callWrap,
+  handleError: handleError,
+  isArray: lib.isArray,
+  keys: lib.keys,
+  SafeString: SafeString,
+  copySafeness: copySafeness,
+  markSafe: markSafe,
+  asyncEach: asyncEach,
+  asyncAll: asyncAll,
+  inOperator: lib.inOperator,
+  fromIterator: fromIterator
+};

book/node_modules/nunjucks/src/tests.js

@@ -0,0 +1,265 @@
+'use strict';
+
+var SafeString = require('./runtime').SafeString;
+
+/**
+ * Returns `true` if the object is a function, otherwise `false`.
+ * @param { any } value
+ * @returns { boolean }
+ */
+function callable(value) {
+  return typeof value === 'function';
+}
+exports.callable = callable;
+
+/**
+ * Returns `true` if the object is strictly not `undefined`.
+ * @param { any } value
+ * @returns { boolean }
+ */
+function defined(value) {
+  return value !== undefined;
+}
+exports.defined = defined;
+
+/**
+ * Returns `true` if the operand (one) is divisble by the test's argument
+ * (two).
+ * @param { number } one
+ * @param { number } two
+ * @returns { boolean }
+ */
+function divisibleby(one, two) {
+  return one % two === 0;
+}
+exports.divisibleby = divisibleby;
+
+/**
+ * Returns true if the string has been escaped (i.e., is a SafeString).
+ * @param { any } value
+ * @returns { boolean }
+ */
+function escaped(value) {
+  return value instanceof SafeString;
+}
+exports.escaped = escaped;
+
+/**
+ * Returns `true` if the arguments are strictly equal.
+ * @param { any } one
+ * @param { any } two
+ */
+function equalto(one, two) {
+  return one === two;
+}
+exports.equalto = equalto;
+
+// Aliases
+exports.eq = exports.equalto;
+exports.sameas = exports.equalto;
+
+/**
+ * Returns `true` if the value is evenly divisible by 2.
+ * @param { number } value
+ * @returns { boolean }
+ */
+function even(value) {
+  return value % 2 === 0;
+}
+exports.even = even;
+
+/**
+ * Returns `true` if the value is falsy - if I recall correctly, '', 0, false,
+ * undefined, NaN or null. I don't know if we should stick to the default JS
+ * behavior or attempt to replicate what Python believes should be falsy (i.e.,
+ * empty arrays, empty dicts, not 0...).
+ * @param { any } value
+ * @returns { boolean }
+ */
+function falsy(value) {
+  return !value;
+}
+exports.falsy = falsy;
+
+/**
+ * Returns `true` if the operand (one) is greater or equal to the test's
+ * argument (two).
+ * @param { number } one
+ * @param { number } two
+ * @returns { boolean }
+ */
+function ge(one, two) {
+  return one >= two;
+}
+exports.ge = ge;
+
+/**
+ * Returns `true` if the operand (one) is greater than the test's argument
+ * (two).
+ * @param { number } one
+ * @param { number } two
+ * @returns { boolean }
+ */
+function greaterthan(one, two) {
+  return one > two;
+}
+exports.greaterthan = greaterthan;
+
+// alias
+exports.gt = exports.greaterthan;
+
+/**
+ * Returns `true` if the operand (one) is less than or equal to the test's
+ * argument (two).
+ * @param { number } one
+ * @param { number } two
+ * @returns { boolean }
+ */
+function le(one, two) {
+  return one <= two;
+}
+exports.le = le;
+
+/**
+ * Returns `true` if the operand (one) is less than the test's passed argument
+ * (two).
+ * @param { number } one
+ * @param { number } two
+ * @returns { boolean }
+ */
+function lessthan(one, two) {
+  return one < two;
+}
+exports.lessthan = lessthan;
+
+// alias
+exports.lt = exports.lessthan;
+
+/**
+ * Returns `true` if the string is lowercased.
+ * @param { string } value
+ * @returns { boolean }
+ */
+function lower(value) {
+  return value.toLowerCase() === value;
+}
+exports.lower = lower;
+
+/**
+ * Returns `true` if the operand (one) is less than or equal to the test's
+ * argument (two).
+ * @param { number } one
+ * @param { number } two
+ * @returns { boolean }
+ */
+function ne(one, two) {
+  return one !== two;
+}
+exports.ne = ne;
+
+/**
+ * Returns true if the value is strictly equal to `null`.
+ * @param { any }
+ * @returns { boolean }
+ */
+function nullTest(value) {
+  return value === null;
+}
+exports.null = nullTest;
+
+/**
+ * Returns true if value is a number.
+ * @param { any }
+ * @returns { boolean }
+ */
+function number(value) {
+  return typeof value === 'number';
+}
+exports.number = number;
+
+/**
+ * Returns `true` if the value is *not* evenly divisible by 2.
+ * @param { number } value
+ * @returns { boolean }
+ */
+function odd(value) {
+  return value % 2 === 1;
+}
+exports.odd = odd;
+
+/**
+ * Returns `true` if the value is a string, `false` if not.
+ * @param { any } value
+ * @returns { boolean }
+ */
+function string(value) {
+  return typeof value === 'string';
+}
+exports.string = string;
+
+/**
+ * Returns `true` if the value is not in the list of things considered falsy:
+ * '', null, undefined, 0, NaN and false.
+ * @param { any } value
+ * @returns { boolean }
+ */
+function truthy(value) {
+  return !!value;
+}
+exports.truthy = truthy;
+
+/**
+ * Returns `true` if the value is undefined.
+ * @param { any } value
+ * @returns { boolean }
+ */
+function undefinedTest(value) {
+  return value === undefined;
+}
+exports.undefined = undefinedTest;
+
+/**
+ * Returns `true` if the string is uppercased.
+ * @param { string } value
+ * @returns { boolean }
+ */
+function upper(value) {
+  return value.toUpperCase() === value;
+}
+exports.upper = upper;
+
+/**
+ * If ES6 features are available, returns `true` if the value implements the
+ * `Symbol.iterator` method. If not, it's a string or Array.
+ *
+ * Could potentially cause issues if a browser exists that has Set and Map but
+ * not Symbol.
+ *
+ * @param { any } value
+ * @returns { boolean }
+ */
+function iterable(value) {
+  if (typeof Symbol !== 'undefined') {
+    return !!value[Symbol.iterator];
+  } else {
+    return Array.isArray(value) || typeof value === 'string';
+  }
+}
+exports.iterable = iterable;
+
+/**
+ * If ES6 features are available, returns `true` if the value is an object hash
+ * or an ES6 Map. Otherwise just return if it's an object hash.
+ * @param { any } value
+ * @returns { boolean }
+ */
+function mapping(value) {
+  // only maps and object hashes
+  var bool = value !== null && value !== undefined && typeof value === 'object' && !Array.isArray(value);
+  if (Set) {
+    return bool && !(value instanceof Set);
+  } else {
+    return bool;
+  }
+}
+exports.mapping = mapping;

book/node_modules/nunjucks/src/transformer.js

@@ -0,0 +1,166 @@
+'use strict';
+
+var nodes = require('./nodes');
+var lib = require('./lib');
+var sym = 0;
+function gensym() {
+  return 'hole_' + sym++;
+}
+
+// copy-on-write version of map
+function mapCOW(arr, func) {
+  var res = null;
+  for (var i = 0; i < arr.length; i++) {
+    var item = func(arr[i]);
+    if (item !== arr[i]) {
+      if (!res) {
+        res = arr.slice();
+      }
+      res[i] = item;
+    }
+  }
+  return res || arr;
+}
+function walk(ast, func, depthFirst) {
+  if (!(ast instanceof nodes.Node)) {
+    return ast;
+  }
+  if (!depthFirst) {
+    var astT = func(ast);
+    if (astT && astT !== ast) {
+      return astT;
+    }
+  }
+  if (ast instanceof nodes.NodeList) {
+    var children = mapCOW(ast.children, function (node) {
+      return walk(node, func, depthFirst);
+    });
+    if (children !== ast.children) {
+      ast = new nodes[ast.typename](ast.lineno, ast.colno, children);
+    }
+  } else if (ast instanceof nodes.CallExtension) {
+    var args = walk(ast.args, func, depthFirst);
+    var contentArgs = mapCOW(ast.contentArgs, function (node) {
+      return walk(node, func, depthFirst);
+    });
+    if (args !== ast.args || contentArgs !== ast.contentArgs) {
+      ast = new nodes[ast.typename](ast.extName, ast.prop, args, contentArgs);
+    }
+  } else {
+    var props = ast.fields.map(function (field) {
+      return ast[field];
+    });
+    var propsT = mapCOW(props, function (prop) {
+      return walk(prop, func, depthFirst);
+    });
+    if (propsT !== props) {
+      ast = new nodes[ast.typename](ast.lineno, ast.colno);
+      propsT.forEach(function (prop, i) {
+        ast[ast.fields[i]] = prop;
+      });
+    }
+  }
+  return depthFirst ? func(ast) || ast : ast;
+}
+function depthWalk(ast, func) {
+  return walk(ast, func, true);
+}
+function _liftFilters(node, asyncFilters, prop) {
+  var children = [];
+  var walked = depthWalk(prop ? node[prop] : node, function (descNode) {
+    var symbol;
+    if (descNode instanceof nodes.Block) {
+      return descNode;
+    } else if (descNode instanceof nodes.Filter && lib.indexOf(asyncFilters, descNode.name.value) !== -1 || descNode instanceof nodes.CallExtensionAsync) {
+      symbol = new nodes.Symbol(descNode.lineno, descNode.colno, gensym());
+      children.push(new nodes.FilterAsync(descNode.lineno, descNode.colno, descNode.name, descNode.args, symbol));
+    }
+    return symbol;
+  });
+  if (prop) {
+    node[prop] = walked;
+  } else {
+    node = walked;
+  }
+  if (children.length) {
+    children.push(node);
+    return new nodes.NodeList(node.lineno, node.colno, children);
+  } else {
+    return node;
+  }
+}
+function liftFilters(ast, asyncFilters) {
+  return depthWalk(ast, function (node) {
+    if (node instanceof nodes.Output) {
+      return _liftFilters(node, asyncFilters);
+    } else if (node instanceof nodes.Set) {
+      return _liftFilters(node, asyncFilters, 'value');
+    } else if (node instanceof nodes.For) {
+      return _liftFilters(node, asyncFilters, 'arr');
+    } else if (node instanceof nodes.If) {
+      return _liftFilters(node, asyncFilters, 'cond');
+    } else if (node instanceof nodes.CallExtension) {
+      return _liftFilters(node, asyncFilters, 'args');
+    } else {
+      return undefined;
+    }
+  });
+}
+function liftSuper(ast) {
+  return walk(ast, function (blockNode) {
+    if (!(blockNode instanceof nodes.Block)) {
+      return;
+    }
+    var hasSuper = false;
+    var symbol = gensym();
+    blockNode.body = walk(blockNode.body, function (node) {
+      // eslint-disable-line consistent-return
+      if (node instanceof nodes.FunCall && node.name.value === 'super') {
+        hasSuper = true;
+        return new nodes.Symbol(node.lineno, node.colno, symbol);
+      }
+    });
+    if (hasSuper) {
+      blockNode.body.children.unshift(new nodes.Super(0, 0, blockNode.name, new nodes.Symbol(0, 0, symbol)));
+    }
+  });
+}
+function convertStatements(ast) {
+  return depthWalk(ast, function (node) {
+    if (!(node instanceof nodes.If) && !(node instanceof nodes.For)) {
+      return undefined;
+    }
+    var async = false;
+    walk(node, function (child) {
+      if (child instanceof nodes.FilterAsync || child instanceof nodes.IfAsync || child instanceof nodes.AsyncEach || child instanceof nodes.AsyncAll || child instanceof nodes.CallExtensionAsync) {
+        async = true;
+        // Stop iterating by returning the node
+        return child;
+      }
+      return undefined;
+    });
+    if (async) {
+      if (node instanceof nodes.If) {
+        return new nodes.IfAsync(node.lineno, node.colno, node.cond, node.body, node.else_);
+      } else if (node instanceof nodes.For && !(node instanceof nodes.AsyncAll)) {
+        return new nodes.AsyncEach(node.lineno, node.colno, node.arr, node.name, node.body, node.else_);
+      }
+    }
+    return undefined;
+  });
+}
+function cps(ast, asyncFilters) {
+  return convertStatements(liftSuper(liftFilters(ast, asyncFilters)));
+}
+function transform(ast, asyncFilters) {
+  return cps(ast, asyncFilters || []);
+}
+
+// var parser = require('./parser');
+// var src = 'hello {% foo %}{% endfoo %} end';
+// var ast = transform(parser.parse(src, [new FooExtension()]), ['bar']);
+// nodes.printNodes(ast);
+
+module.exports = {
+  transform: transform
+};

book/node_modules/nunjucks/src/web-loaders.js

@@ -0,0 +1,94 @@
+'use strict';
+
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var Loader = require('./loader');
+var _require = require('./precompiled-loader.js'),
+  PrecompiledLoader = _require.PrecompiledLoader;
+var WebLoader = /*#__PURE__*/function (_Loader) {
+  _inheritsLoose(WebLoader, _Loader);
+  function WebLoader(baseURL, opts) {
+    var _this;
+    _this = _Loader.call(this) || this;
+    _this.baseURL = baseURL || '.';
+    opts = opts || {};
+
+    // By default, the cache is turned off because there's no way
+    // to "watch" templates over HTTP, so they are re-downloaded
+    // and compiled each time. (Remember, PRECOMPILE YOUR
+    // TEMPLATES in production!)
+    _this.useCache = !!opts.useCache;
+
+    // We default `async` to false so that the simple synchronous
+    // API can be used when you aren't doing anything async in
+    // your templates (which is most of the time). This performs a
+    // sync ajax request, but that's ok because it should *only*
+    // happen in development. PRECOMPILE YOUR TEMPLATES.
+    _this.async = !!opts.async;
+    return _this;
+  }
+  var _proto = WebLoader.prototype;
+  _proto.resolve = function resolve(from, to) {
+    throw new Error('relative templates not support in the browser yet');
+  };
+  _proto.getSource = function getSource(name, cb) {
+    var _this2 = this;
+    var useCache = this.useCache;
+    var result;
+    this.fetch(this.baseURL + '/' + name, function (err, src) {
+      if (err) {
+        if (cb) {
+          cb(err.content);
+        } else if (err.status === 404) {
+          result = null;
+        } else {
+          throw err.content;
+        }
+      } else {
+        result = {
+          src: src,
+          path: name,
+          noCache: !useCache
+        };
+        _this2.emit('load', name, result);
+        if (cb) {
+          cb(null, result);
+        }
+      }
+    });
+
+    // if this WebLoader isn't running asynchronously, the
+    // fetch above would actually run sync and we'll have a
+    // result here
+    return result;
+  };
+  _proto.fetch = function fetch(url, cb) {
+    // Only in the browser please
+    if (typeof window === 'undefined') {
+      throw new Error('WebLoader can only by used in a browser');
+    }
+    var ajax = new XMLHttpRequest();
+    var loading = true;
+    ajax.onreadystatechange = function () {
+      if (ajax.readyState === 4 && loading) {
+        loading = false;
+        if (ajax.status === 0 || ajax.status === 200) {
+          cb(null, ajax.responseText);
+        } else {
+          cb({
+            status: ajax.status,
+            content: ajax.responseText
+          });
+        }
+      }
+    };
+    url += (url.indexOf('?') === -1 ? '?' : '&') + 's=' + new Date().getTime();
+    ajax.open('GET', url, this.async);
+    ajax.send();
+  };
+  return WebLoader;
+}(Loader);
+module.exports = {
+  WebLoader: WebLoader,
+  PrecompiledLoader: PrecompiledLoader
+};