'use strict'

module.exports = dot
dot.displayName = 'dot'
dot.aliases = ['gv']
function dot(Prism) {
  // https://www.graphviz.org/doc/info/lang.html
  ;(function (Prism) {
    var ID =
      '(?:' +
      [
        // an identifier
        /[a-zA-Z_\x80-\uFFFF][\w\x80-\uFFFF]*/.source, // a number
        /-?(?:\.\d+|\d+(?:\.\d*)?)/.source, // a double-quoted string
        /"[^"\\]*(?:\\[\s\S][^"\\]*)*"/.source, // HTML-like string
        /<(?:[^<>]|(?!<!--)<(?:[^<>"']|"[^"]*"|'[^']*')+>|<!--(?:[^-]|-(?!->))*-->)*>/
          .source
      ].join('|') +
      ')'
    var IDInside = {
      markup: {
        pattern: /(^<)[\s\S]+(?=>$)/,
        lookbehind: true,
        alias: ['language-markup', 'language-html', 'language-xml'],
        inside: Prism.languages.markup
      }
    }
    /**
     * @param {string} source
     * @param {string} flags
     * @returns {RegExp}
     */
    function withID(source, flags) {
      return RegExp(
        source.replace(/<ID>/g, function () {
          return ID
        }),
        flags
      )
    }
    Prism.languages.dot = {
      comment: {
        pattern: /\/\/.*|\/\*[\s\S]*?\*\/|^#.*/m,
        greedy: true
      },
      'graph-name': {
        pattern: withID(
          /(\b(?:digraph|graph|subgraph)[ \t\r\n]+)<ID>/.source,
          'i'
        ),
        lookbehind: true,
        greedy: true,
        alias: 'class-name',
        inside: IDInside
      },
      'attr-value': {
        pattern: withID(/(=[ \t\r\n]*)<ID>/.source),
        lookbehind: true,
        greedy: true,
        inside: IDInside
      },
      'attr-name': {
        pattern: withID(/([\[;, \t\r\n])<ID>(?=[ \t\r\n]*=)/.source),
        lookbehind: true,
        greedy: true,
        inside: IDInside
      },
      keyword: /\b(?:digraph|edge|graph|node|strict|subgraph)\b/i,
      'compass-point': {
        pattern: /(:[ \t\r\n]*)(?:[ewc_]|[ns][ew]?)(?![\w\x80-\uFFFF])/,
        lookbehind: true,
        alias: 'builtin'
      },
      node: {
        pattern: withID(/(^|[^-.\w\x80-\uFFFF\\])<ID>/.source),
        lookbehind: true,
        greedy: true,
        inside: IDInside
      },
      operator: /[=:]|-[->]/,
      punctuation: /[\[\]{};,]/
    }
    Prism.languages.gv = Prism.languages.dot
  })(Prism)
}