reprism/src/languages/erlang.js

Modular Syntax highlighting for the web

export default {
  language: 'erlang',
  init: Prism => {
    Prism.languages.erlang = {
      comment: /%.+/,
      string: {
        pattern: /"(?:\\.|[^\\"\r\n])*"/,
        greedy: true,
      },
      'quoted-function': {
        pattern: /'(?:\\.|[^\\'\r\n])+'(?=\()/,
        alias: 'function',
      },
      'quoted-atom': {
        pattern: /'(?:\\.|[^\\'\r\n])+'/,
        alias: 'atom',
      },
      boolean: /\b(?:true|false)\b/,
      keyword: /\b(?:fun|when|case|of|end|if|receive|after|try|catch)\b/,
      number: [
        /\$\\?./,
        /\d+#[a-z0-9]+/i,
        /(?:\b\d+\.?\d*|\B\.\d+)(?:e[+-]?\d+)?/i,
      ],
      function: /\b[a-z][\w@]*(?=\()/,
      variable: {
        // Look-behind is used to prevent wrong highlighting of atoms containing "@"
        pattern: /(^|[^@])(?:\b|\?)[A-Z_][\w@]*/,
        lookbehind: true,
      },
      operator: [
        /[=\/<>:]=|=[:\/]=|\+\+?|--?|[=*\/!]|\b(?:bnot|div|rem|band|bor|bxor|bsl|bsr|not|and|or|xor|orelse|andalso)\b/,
        {
          // We don't want to match <<
          pattern: /(^|[^<])<(?!<)/,
          lookbehind: true,
        },
        {
          // We don't want to match >>
          pattern: /(^|[^>])>(?!>)/,
          lookbehind: true,
        },
      ],
      atom: /\b[a-z][\w@]*/,
      punctuation: /[()[\]{}:;,.#|]|<<|>>/,
    }
  },
}