function defineWhistleMode()

in wstl1/tools/notebook/wstl-syntax-highlighting/src/index.ts [30:89]

• 46 lines of code
• 1 McCabe index (conditional complexity)

function defineWhistleMode(app: JupyterFrontEnd): void {
  // TODO(): autogenerate rules from whistle grammar.
  CodeMirror.defineSimpleMode(WHISTLE_MODE, {
    // The start state contains the rules that are intially used.
    start: [
      // Strings.
      {regex: /"(?:[^\\]|\\.)*?(?:"|$)/, token: 'string'},
      // Builtin functions.
      {regex: /\$([a-zA-Z_\d]*)/, token: ['keyword', null, 'def']},
      // Iterator brackets.
      {regex: /\[\]/, token: 'meta'},
      // Function declarations.
      {
        regex: /(def)(\s+)([a-zA-Z_$][\w$]*)/,
        token: ['keyword', null, 'variable-2']
      },
      // Rules are matched in the order in which they appear, so there is
      // no ambiguity between this one and the one above.
      {
        regex:
            /(\$root|\$this)|(?:def|if|where|else|var|out|root|dest|post|this|\^)\b/,
        token: ['builtin', null, 'keyword']
      },
      {regex: /true|false|null|undefined|required/, token: 'builtin'},
      {
        regex: /0x[a-f\d]+|\s+[-+]?(?:\.\d+|\d+\.?\d*)(?:e[-+]?\d+)?/i,
        token: 'number'
      },
      {regex: /\/\/.*/, token: 'comment'},
      // Language operators.
      {regex: /[-+\/*=<>!~?@]+|and|or|\[\*\]/, token: 'operator'},
      // Indent and dedent properties guide autoindentation.
      {regex: /[\{\[\(]/, indent: true},
      {regex: /[\}\]\)]/, dedent: true},
      {regex: /[a-z$][\w$]*/, token: 'variable'},
    ],
    // The meta property contains global information about the mode. It
    // can contain properties like lineComment, which are supported by
    // all modes, and also directives like dontIndentStates, which are
    // specific to simple modes.
    meta: {dontIndentStates: ['comment'], lineComment: '//'}
  });
  CodeMirror.defineMIME(WHISTLE_MODE_MIME_TYPE, WHISTLE_MODE);
  Mode.getModeInfo().push({
    ext: [WHISTLE_EXT],
    mime: WHISTLE_MODE_MIME_TYPE,
    mode: WHISTLE_MODE,
    name: WHISTLE_MODE
  });
  app.docRegistry.addFileType({
    name: 'wstl',
    displayName: 'Whistle File',
    extensions: ['.wstl'],
    mimeTypes: [WHISTLE_MODE_MIME_TYPE],
    iconClass: 'jp-MaterialIcon reactivecore_icon',
    iconLabel: '',
    contentType: 'file',
    fileFormat: 'text'
  });
}