216 lines
7.2 KiB
JavaScript
216 lines
7.2 KiB
JavaScript
/**
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* @param {string} value
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* @returns {RegExp}
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* */
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/**
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* @param {RegExp | string } re
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* @returns {string}
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*/
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function source(re) {
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if (!re) return null;
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if (typeof re === "string") return re;
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return re.source;
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}
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/**
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* @param {...(RegExp | string) } args
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* @returns {string}
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*/
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function concat(...args) {
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const joined = args.map((x) => source(x)).join("");
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return joined;
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}
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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: scientific
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*/
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function r(hljs) {
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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 SIMPLE_IDENT = /[a-zA-Z][a-zA-Z_0-9]*/;
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return {
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name: 'R',
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// only in Haskell, not R
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illegal: /->/,
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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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{
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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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className: 'doctag',
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begin: '@examples',
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starts: {
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contains: [
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{ begin: /\n/ },
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{
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begin: /#'\s*(?=@[a-zA-Z]+)/,
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endsParent: true,
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},
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{
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begin: /#'/,
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end: /$/,
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excludeBegin: true,
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}
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]
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}
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},
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{
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// Handle `@param` to highlight the parameter name following
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// after.
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className: 'doctag',
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begin: '@param',
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end: /$/,
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contains: [
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{
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className: 'variable',
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variants: [
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{ begin: IDENT_RE },
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{ begin: /`(?:\\.|[^`\\])+`/ }
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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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className: 'doctag',
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begin: /@[a-zA-Z]+/
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},
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{
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className: 'meta-keyword',
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begin: /\\[a-zA-Z]+/,
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}
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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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className: 'string',
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contains: [hljs.BACKSLASH_ESCAPE],
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variants: [
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hljs.END_SAME_AS_BEGIN({ begin: /[rR]"(-*)\(/, end: /\)(-*)"/ }),
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hljs.END_SAME_AS_BEGIN({ begin: /[rR]"(-*)\{/, end: /\}(-*)"/ }),
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hljs.END_SAME_AS_BEGIN({ begin: /[rR]"(-*)\[/, end: /\](-*)"/ }),
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hljs.END_SAME_AS_BEGIN({ begin: /[rR]'(-*)\(/, end: /\)(-*)'/ }),
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hljs.END_SAME_AS_BEGIN({ begin: /[rR]'(-*)\{/, end: /\}(-*)'/ }),
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hljs.END_SAME_AS_BEGIN({ begin: /[rR]'(-*)\[/, end: /\](-*)'/ }),
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{begin: '"', end: '"', relevance: 0},
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{begin: "'", end: "'", relevance: 0}
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],
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},
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{
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className: 'number',
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variants: [
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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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// The below rules all eat an extra character in front (for the
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// look-behind check) and then exclude it from the match, but I think
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// in many cases this will work out just fine.
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{
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// Special case: only hexadecimal binary powers can contain fractions.
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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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end: /0[xX][0-9a-fA-F]+\.[0-9a-fA-F]*[pP][+-]?\d+i?/,
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excludeBegin: true
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},
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{
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begin: /([^a-zA-Z0-9._])(?=0[xX][0-9a-fA-F]+([pP][+-]?\d+)?[Li]?)/,
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end: /0[xX][0-9a-fA-F]+([pP][+-]?\d+)?[Li]?/ ,
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excludeBegin: true
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},
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{
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begin: /([^a-zA-Z0-9._])(?=(\d+(\.\d*)?|\.\d+)([eE][+-]?\d+)?[Li]?)/,
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end: /(\d+(\.\d*)?|\.\d+)([eE][+-]?\d+)?[Li]?/,
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excludeBegin: true
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}
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],
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// "on:begin": (match, response) => {
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// if (match.index > 0) {
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// let priorChar = match.input[match.index - 1];
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// if (priorChar.match(/[a-zA-Z0-9._]/)) response.ignoreMatch();
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// }
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// },
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relevance: 0
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},
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{
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// infix operator
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begin: '%',
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end: '%'
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},
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// relevance boost for assignment
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{
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begin: concat(SIMPLE_IDENT, "\\s+<-\\s+")
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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: [
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{ begin: /\\./ }
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]
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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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