reprism/src/languages/coffeescript.js

Modular Syntax highlighting for the web

export default {
  language: 'coffeescript',
  init: Prism => {
    (function (Prism) {
      // Ignore comments starting with { to privilege string interpolation highlighting
      let comment = /#(?!\{).+/,
        interpolation = {
          pattern: /#\{[^}]+\}/,
          alias: 'variable',
        }

      Prism.languages.coffeescript = Prism.languages.extend('javascript', {
        comment,
        string: [
          // Strings are multiline
          {
            pattern: /'(?:\\[\s\S]|[^\\'])*'/,
            greedy: true,
          },

          {
            // Strings are multiline
            pattern: /"(?:\\[\s\S]|[^\\"])*"/,
            greedy: true,
            inside: {
              interpolation,
            },
          },
        ],
        keyword: /\b(?:and|break|by|catch|class|continue|debugger|delete|do|each|else|extend|extends|false|finally|for|if|in|instanceof|is|isnt|let|loop|namespace|new|no|not|null|of|off|on|or|own|return|super|switch|then|this|throw|true|try|typeof|undefined|unless|until|when|while|window|with|yes|yield)\b/,
        'class-member': {
          pattern: /@(?!\d)\w+/,
          alias: 'variable',
        },
      })

      Prism.languages.insertBefore('coffeescript', 'comment', {
        'multiline-comment': {
          pattern: /###[\s\S]+?###/,
          alias: 'comment',
        },

        // Block regexp can contain comments and interpolation
        'block-regex': {
          pattern: /\/{3}[\s\S]*?\/{3}/,
          alias: 'regex',
          inside: {
            comment,
            interpolation,
          },
        },
      })

      Prism.languages.insertBefore('coffeescript', 'string', {
        'inline-javascript': {
          pattern: /`(?:\\[\s\S]|[^\\`])*`/,
          inside: {
            delimiter: {
              pattern: /^`|`$/,
              alias: 'punctuation',
            },
            rest: Prism.languages.javascript,
          },
        },

        // Block strings
        'multiline-string': [
          {
            pattern: /'''[\s\S]*?'''/,
            greedy: true,
            alias: 'string',
          },
          {
            pattern: /"""[\s\S]*?"""/,
            greedy: true,
            alias: 'string',
            inside: {
              interpolation,
            },
          },
        ],
      })

      Prism.languages.insertBefore('coffeescript', 'keyword', {
        // Object property
        property: /(?!\d)\w+(?=\s*:(?!:))/,
      })

      delete Prism.languages.coffeescript['template-string']
    }(Prism))
  },
}