// Django/Jinja2 syntax definition for Prism.js <http://prismjs.com> syntax highlighter.
// Mostly it works OK but can paint code incorrectly on complex html/template tag combinations.

(function (Prism) {
  Prism.languages.django = {
    comment: /^\{#[\s\S]*?#\}$/,
    tag: {
      pattern: /(^\{%[+-]?\s*)\w+/,
      lookbehind: true,
      alias: 'keyword',
    },
    delimiter: {
      pattern: /^\{[{%][+-]?|[+-]?[}%]\}$/,
      alias: 'punctuation',
    },
    string: {
      pattern: /("|')(?:\\.|(?!\1)[^\\\r\n])*\1/,
      greedy: true,
    },
    filter: {
      pattern: /(\|)\w+/,
      lookbehind: true,
      alias: 'function',
    },
    test: {
      pattern: /(\bis\s+(?:not\s+)?)(?!not\b)\w+/,
      lookbehind: true,
      alias: 'function',
    },
    function: /\b[a-z_]\w+(?=\s*\()/i,
    keyword:
      /\b(?:and|as|by|else|for|if|import|in|is|loop|not|or|recursive|with|without)\b/,
    operator: /[-+%=]=?|!=|\*\*?=?|\/\/?=?|<[<=>]?|>[=>]?|[&|^~]/,
    number: /\b\d+(?:\.\d+)?\b/,
    boolean: /[Ff]alse|[Nn]one|[Tt]rue/,
    variable: /\b\w+\b/,
    punctuation: /[{}[\](),.:;]/,
  };

  var pattern = /\{\{[\s\S]*?\}\}|\{%[\s\S]*?%\}|\{#[\s\S]*?#\}/g;
  var markupTemplating = Prism.languages['markup-templating'];

  Prism.hooks.add('before-tokenize', function (env) {
    markupTemplating.buildPlaceholders(env, 'django', pattern);
  });
  Prism.hooks.add('after-tokenize', function (env) {
    markupTemplating.tokenizePlaceholders(env, 'django');
  });

  // Add an Jinja2 alias
  Prism.languages.jinja2 = Prism.languages.django;
  Prism.hooks.add('before-tokenize', function (env) {
    markupTemplating.buildPlaceholders(env, 'jinja2', pattern);
  });
  Prism.hooks.add('after-tokenize', function (env) {
    markupTemplating.tokenizePlaceholders(env, 'jinja2');
  });
})(Prism);