refractor/lang/flow.js

Lightweight, robust, elegant virtual syntax highlighting using Prism

'use strict';

module.exports = flow;
flow.displayName = 'flow';
flow.aliases = [];
function flow(Prism) {
  (function(Prism) {
    Prism.languages.flow = Prism.languages.extend('javascript', {});
    Prism.languages.insertBefore('flow', 'keyword', {
      type: [
        {
          pattern: /\b(?:[Nn]umber|[Ss]tring|[Bb]oolean|Function|any|mixed|null|void)\b/,
          alias: 'tag'
        }
      ]
    });
    Prism.languages.flow[
      'function-variable'
    ].pattern = /[_$a-z\xA0-\uFFFF][$\w\xA0-\uFFFF]*(?=\s*=\s*(?:function\b|(?:\([^()]*\)(?:\s*:\s*\w+)?|[_$a-z\xA0-\uFFFF][$\w\xA0-\uFFFF]*)\s*=>))/i;
    Prism.languages.insertBefore('flow', 'operator', {
      'flow-punctuation': {
        pattern: /\{\||\|\}/,
        alias: 'punctuation'
      }
    });
    if (Prism.util.type(Prism.languages.flow.keyword) !== 'Array') {
      Prism.languages.flow.keyword = [Prism.languages.flow.keyword];
    }
    Prism.languages.flow.keyword.unshift(
      {
        pattern: /(^|[^$]\b)(?:type|opaque|declare|Class)\b(?!\$)/,
        lookbehind: true
      },
      {
        pattern: /(^|[^$]\B)\$(?:await|Diff|Exact|Keys|ObjMap|PropertyType|Shape|Record|Supertype|Subtype|Enum)\b(?!\$)/,
        lookbehind: true
      }
    );
  })(Prism);
}