reprism/src/languages/prolog.js

Modular Syntax highlighting for the web

export default {
  language: 'prolog',
  init: Prism => {
    Prism.languages.prolog = {
      // Syntax depends on the implementation
      comment: [/%.+/, /\/\*[\s\S]*?\*\//],
      // Depending on the implementation, strings may allow escaped newlines and quote-escape
      string: {
        pattern: /(["'])(?:\1\1|\\(?:\r\n|[\s\S])|(?!\1)[^\\\r\n])*\1/,
        greedy: true,
      },
      builtin: /\b(?:fx|fy|xf[xy]?|yfx?)\b/,
      variable: /\b[A-Z_]\w*/,
      // FIXME: Should we list all null-ary predicates (not followed by a parenthesis) like halt, trace, etc.?
      function: /\b[a-z]\w*(?:(?=\()|\/\d+)/,
      number: /\b\d+\.?\d*/,
      // Custom operators are allowed
      operator: /[:\\=><\-?*@\/;+^|!$.]+|\b(?:is|mod|not|xor)\b/,
      punctuation: /[(){}\[\],]/,
    }
  },
}