reprism/src/languages/r.js

Modular Syntax highlighting for the web

export default {
  language: 'r',
  init: Prism => {
    Prism.languages.r = {
      comment: /#.*/,
      string: {
        pattern: /(['"])(?:\\.|(?!\1)[^\\\r\n])*\1/,
        greedy: true,
      },
      'percent-operator': {
        // Includes user-defined operators
        // and %%, %*%, %/%, %in%, %o%, %x%
        pattern: /%[^%\s]*%/,
        alias: 'operator',
      },
      boolean: /\b(?:TRUE|FALSE)\b/,
      ellipsis: /\.\.(?:\.|\d+)/,
      number: [
        /\b(?:NaN|Inf)\b/,
        /(?:\b0x[\dA-Fa-f]+(?:\.\d*)?|\b\d+\.?\d*|\B\.\d+)(?:[EePp][+-]?\d+)?[iL]?/,
      ],
      keyword: /\b(?:if|else|repeat|while|function|for|in|next|break|NULL|NA|NA_integer_|NA_real_|NA_complex_|NA_character_)\b/,
      operator: /->?>?|<(?:=|<?-)?|[>=!]=?|::?|&&?|\|\|?|[+*\/^$@~]/,
      punctuation: /[(){}\[\],;]/,
    }
  },
}