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book/node_modules/highlight.js/lib/languages/r.js
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book/node_modules/highlight.js/lib/languages/r.js
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/*
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Language: R
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Description: R is a free software environment for statistical computing and graphics.
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Author: Joe Cheng <joe@rstudio.org>
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Contributors: Konrad Rudolph <konrad.rudolph@gmail.com>
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Website: https://www.r-project.org
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Category: common,scientific
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*/
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/** @type LanguageFn */
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function r(hljs) {
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const regex = hljs.regex;
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// Identifiers in R cannot start with `_`, but they can start with `.` if it
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// is not immediately followed by a digit.
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// R also supports quoted identifiers, which are near-arbitrary sequences
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// delimited by backticks (`…`), which may contain escape sequences. These are
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// handled in a separate mode. See `test/markup/r/names.txt` for examples.
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// FIXME: Support Unicode identifiers.
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const IDENT_RE = /(?:(?:[a-zA-Z]|\.[._a-zA-Z])[._a-zA-Z0-9]*)|\.(?!\d)/;
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const NUMBER_TYPES_RE = regex.either(
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// Special case: only hexadecimal binary powers can contain fractions
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/0[xX][0-9a-fA-F]+\.[0-9a-fA-F]*[pP][+-]?\d+i?/,
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// Hexadecimal numbers without fraction and optional binary power
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/0[xX][0-9a-fA-F]+(?:[pP][+-]?\d+)?[Li]?/,
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// Decimal numbers
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/(?:\d+(?:\.\d*)?|\.\d+)(?:[eE][+-]?\d+)?[Li]?/
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);
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const OPERATORS_RE = /[=!<>:]=|\|\||&&|:::?|<-|<<-|->>|->|\|>|[-+*\/?!$&|:<=>@^~]|\*\*/;
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const PUNCTUATION_RE = regex.either(
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/[()]/,
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/[{}]/,
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/\[\[/,
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/[[\]]/,
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/\\/,
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/,/
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);
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return {
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name: 'R',
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keywords: {
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$pattern: IDENT_RE,
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keyword:
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'function if in break next repeat else for while',
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literal:
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'NULL NA TRUE FALSE Inf NaN NA_integer_|10 NA_real_|10 '
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+ 'NA_character_|10 NA_complex_|10',
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built_in:
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// Builtin constants
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'LETTERS letters month.abb month.name pi T F '
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// Primitive functions
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// These are all the functions in `base` that are implemented as a
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// `.Primitive`, minus those functions that are also keywords.
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+ 'abs acos acosh all any anyNA Arg as.call as.character '
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+ 'as.complex as.double as.environment as.integer as.logical '
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+ 'as.null.default as.numeric as.raw asin asinh atan atanh attr '
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+ 'attributes baseenv browser c call ceiling class Conj cos cosh '
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+ 'cospi cummax cummin cumprod cumsum digamma dim dimnames '
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+ 'emptyenv exp expression floor forceAndCall gamma gc.time '
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+ 'globalenv Im interactive invisible is.array is.atomic is.call '
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+ 'is.character is.complex is.double is.environment is.expression '
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+ 'is.finite is.function is.infinite is.integer is.language '
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+ 'is.list is.logical is.matrix is.na is.name is.nan is.null '
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+ 'is.numeric is.object is.pairlist is.raw is.recursive is.single '
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+ 'is.symbol lazyLoadDBfetch length lgamma list log max min '
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+ 'missing Mod names nargs nzchar oldClass on.exit pos.to.env '
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+ 'proc.time prod quote range Re rep retracemem return round '
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+ 'seq_along seq_len seq.int sign signif sin sinh sinpi sqrt '
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+ 'standardGeneric substitute sum switch tan tanh tanpi tracemem '
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+ 'trigamma trunc unclass untracemem UseMethod xtfrm',
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},
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contains: [
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// Roxygen comments
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hljs.COMMENT(
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/#'/,
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/$/,
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{ contains: [
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{
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// Handle `@examples` separately to cause all subsequent code
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// until the next `@`-tag on its own line to be kept as-is,
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// preventing highlighting. This code is example R code, so nested
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// doctags shouldn’t be treated as such. See
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// `test/markup/r/roxygen.txt` for an example.
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scope: 'doctag',
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match: /@examples/,
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starts: {
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end: regex.lookahead(regex.either(
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// end if another doc comment
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/\n^#'\s*(?=@[a-zA-Z]+)/,
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// or a line with no comment
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/\n^(?!#')/
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)),
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endsParent: true
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}
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},
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{
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// Handle `@param` to highlight the parameter name following
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// after.
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scope: 'doctag',
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begin: '@param',
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end: /$/,
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contains: [
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{
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scope: 'variable',
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variants: [
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{ match: IDENT_RE },
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{ match: /`(?:\\.|[^`\\])+`/ }
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],
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endsParent: true
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}
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]
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},
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{
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scope: 'doctag',
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match: /@[a-zA-Z]+/
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},
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{
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scope: 'keyword',
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match: /\\[a-zA-Z]+/
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}
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] }
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),
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hljs.HASH_COMMENT_MODE,
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{
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scope: 'string',
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contains: [ hljs.BACKSLASH_ESCAPE ],
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variants: [
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hljs.END_SAME_AS_BEGIN({
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begin: /[rR]"(-*)\(/,
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end: /\)(-*)"/
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}),
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hljs.END_SAME_AS_BEGIN({
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begin: /[rR]"(-*)\{/,
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end: /\}(-*)"/
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}),
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hljs.END_SAME_AS_BEGIN({
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begin: /[rR]"(-*)\[/,
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end: /\](-*)"/
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}),
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hljs.END_SAME_AS_BEGIN({
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begin: /[rR]'(-*)\(/,
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end: /\)(-*)'/
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}),
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hljs.END_SAME_AS_BEGIN({
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begin: /[rR]'(-*)\{/,
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end: /\}(-*)'/
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}),
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hljs.END_SAME_AS_BEGIN({
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begin: /[rR]'(-*)\[/,
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end: /\](-*)'/
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}),
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{
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begin: '"',
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end: '"',
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relevance: 0
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},
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{
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begin: "'",
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end: "'",
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relevance: 0
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}
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],
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},
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// Matching numbers immediately following punctuation and operators is
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// tricky since we need to look at the character ahead of a number to
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// ensure the number is not part of an identifier, and we cannot use
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// negative look-behind assertions. So instead we explicitly handle all
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// possible combinations of (operator|punctuation), number.
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// TODO: replace with negative look-behind when available
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// { begin: /(?<![a-zA-Z0-9._])0[xX][0-9a-fA-F]+\.[0-9a-fA-F]*[pP][+-]?\d+i?/ },
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// { begin: /(?<![a-zA-Z0-9._])0[xX][0-9a-fA-F]+([pP][+-]?\d+)?[Li]?/ },
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// { begin: /(?<![a-zA-Z0-9._])(\d+(\.\d*)?|\.\d+)([eE][+-]?\d+)?[Li]?/ }
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{
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relevance: 0,
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variants: [
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{
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scope: {
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1: 'operator',
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2: 'number'
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},
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match: [
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OPERATORS_RE,
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NUMBER_TYPES_RE
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]
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},
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{
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scope: {
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1: 'operator',
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2: 'number'
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},
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match: [
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/%[^%]*%/,
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NUMBER_TYPES_RE
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]
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},
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{
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scope: {
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1: 'punctuation',
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2: 'number'
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},
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match: [
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PUNCTUATION_RE,
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NUMBER_TYPES_RE
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]
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},
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{
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scope: { 2: 'number' },
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match: [
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/[^a-zA-Z0-9._]|^/, // not part of an identifier, or start of document
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NUMBER_TYPES_RE
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]
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}
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]
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},
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// Operators/punctuation when they're not directly followed by numbers
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{
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// Relevance boost for the most common assignment form.
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scope: { 3: 'operator' },
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match: [
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IDENT_RE,
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/\s+/,
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/<-/,
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/\s+/
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]
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},
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{
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scope: 'operator',
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relevance: 0,
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variants: [
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{ match: OPERATORS_RE },
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{ match: /%[^%]*%/ }
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]
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},
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{
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scope: 'punctuation',
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relevance: 0,
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match: PUNCTUATION_RE
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},
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{
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// Escaped identifier
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begin: '`',
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end: '`',
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contains: [ { begin: /\\./ } ]
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}
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]
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};
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}
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module.exports = r;
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