reprism/src/languages/yaml.js

Modular Syntax highlighting for the web

export default {
  language: 'yaml',
  init: Prism => {
    Prism.languages.yaml = {
      scalar: {
        pattern: /([\-:]\s*(?:![^\s]+)?[ \t]*[|>])[ \t]*(?:((?:\r?\n|\r)[ \t]+)[^\r\n]+(?:\2[^\r\n]+)*)/,
        lookbehind: true,
        alias: 'string',
      },
      comment: /#.*/,
      key: {
        pattern: /(\s*(?:^|[:\-,[{\r\n?])[ \t]*(?:![^\s]+)?[ \t]*)[^\r\n{[\]},#\s]+?(?=\s*:\s)/,
        lookbehind: true,
        alias: 'atrule',
      },
      directive: {
        pattern: /(^[ \t]*)%.+/m,
        lookbehind: true,
        alias: 'important',
      },
      datetime: {
        pattern: /([:\-,[{]\s*(?:![^\s]+)?[ \t]*)(?:\d{4}-\d\d?-\d\d?(?:[tT]|[ \t]+)\d\d?:\d{2}:\d{2}(?:\.\d*)?[ \t]*(?:Z|[-+]\d\d?(?::\d{2})?)?|\d{4}-\d{2}-\d{2}|\d\d?:\d{2}(?::\d{2}(?:\.\d*)?)?)(?=[ \t]*(?:$|,|]|}))/m,
        lookbehind: true,
        alias: 'number',
      },
      boolean: {
        pattern: /([:\-,[{]\s*(?:![^\s]+)?[ \t]*)(?:true|false)[ \t]*(?=$|,|]|})/im,
        lookbehind: true,
        alias: 'important',
      },
      null: {
        pattern: /([:\-,[{]\s*(?:![^\s]+)?[ \t]*)(?:null|~)[ \t]*(?=$|,|]|})/im,
        lookbehind: true,
        alias: 'important',
      },
      string: {
        pattern: /([:\-,[{]\s*(?:![^\s]+)?[ \t]*)("|')(?:(?!\2)[^\\\r\n]|\\.)*\2(?=[ \t]*(?:$|,|]|}))/m,
        lookbehind: true,
        greedy: true,
      },
      number: {
        pattern: /([:\-,[{]\s*(?:![^\s]+)?[ \t]*)[+-]?(?:0x[\da-f]+|0o[0-7]+|(?:\d+\.?\d*|\.?\d+)(?:e[+-]?\d+)?|\.inf|\.nan)[ \t]*(?=$|,|]|})/im,
        lookbehind: true,
      },
      tag: /![^\s]+/,
      important: /[&*][\w]+/,
      punctuation: /---|[:[\]{}\-,|>?]|\.\.\./,
    }
  },
}