tree-sitter-html/grammar.js at main · WillBooster/tree-sitter-html · GitHub

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/**
 * @file HTML grammar for tree-sitter
 * @author Max Brunsfeld <maxbrunsfeld@gmail.com>
 * @author Amaan Qureshi <amaanq12@gmail.com>
 * @license MIT
 */

/// <reference types="tree-sitter-cli/dsl" />
// @ts-check

module.exports = grammar({
  name: 'html',

  extras: $ => [
    /\s+/,
  ],

  externals: $ => [
    $._start_tag_name,
    $._script_start_tag_name,
    $._style_start_tag_name,
    $._end_tag_name,
    $.erroneous_end_tag_name,
    '/>',
    $._implicit_end_tag,
    $.raw_text,
    $.comment,
    $.processing_instruction,
    $._element_text,
    $._unfinished_processing_instruction,
    $._attribute_entity,
    $._unquoted_attribute_entity,
    $._attribute_ampersand,
    $._unquoted_attribute_fragment,
    $._discarded_start_tag,
    $._missing_start_tag_end,
    $._void_start_tag_name,
  ],

  rules: {
    document: $ => repeat($._node),

    doctype: $ => seq(
      '<!',
      alias($._doctype, 'doctype'),
      $.doctype_value,
      '>',
    ),

    _doctype: _ => /[Dd][Oo][Cc][Tt][Yy][Pp][Ee]/,

    doctype_value: _ => repeat1(/[^>]+/),

    _node: $ => choice(
      $.doctype,
      $.processing_instruction,
      seq($._unfinished_processing_instruction, '>'),
      seq('<', $._discarded_start_tag, alias($._missing_start_tag_end, '>')),
      alias($._element_text, $.text),
      $.comment,
      $.entity,
      $.text,
      alias('&', $.text),
      $.element,
      $.void_element,
      $.script_element,
      $.style_element,
      $.erroneous_end_tag,
    ),

    element: $ => choice(
      seq(
        $.start_tag,
        repeat($._node),
        choice($.end_tag, $._implicit_end_tag),
      ),
      $.self_closing_tag,
    ),

    void_element: $ => seq(
      '<',
      alias($._void_start_tag_name, $.tag_name),
      repeat($.attribute),
      choice(seq('>', $._implicit_end_tag), '/>'),
    ),

    script_element: $ => seq(
      alias($.script_start_tag, $.start_tag),
      optional($.raw_text),
      choice($.end_tag, $._implicit_end_tag),
    ),

    style_element: $ => seq(
      alias($.style_start_tag, $.start_tag),
      optional($.raw_text),
      choice($.end_tag, $._implicit_end_tag),
    ),

    start_tag: $ => seq(
      '<',
      alias($._start_tag_name, $.tag_name),
      repeat($.attribute),
      '>',
    ),

    script_start_tag: $ => seq(
      '<',
      alias($._script_start_tag_name, $.tag_name),
      repeat($.attribute),
      choice('>', '/>'),
    ),

    style_start_tag: $ => seq(
      '<',
      alias($._style_start_tag_name, $.tag_name),
      repeat($.attribute),
      choice('>', '/>'),
    ),

    self_closing_tag: $ => seq(
      '<',
      alias($._start_tag_name, $.tag_name),
      repeat($.attribute),
      '/>',
    ),

    end_tag: $ => seq(
      '</',
      alias($._end_tag_name, $.tag_name),
      '>',
    ),

    erroneous_end_tag: $ => seq(
      '</',
      $.erroneous_end_tag_name,
      '>',
    ),

    attribute: $ => seq(
      $.attribute_name,
      optional(seq(
        '=',
        choice(
          $.unquoted_attribute_value,
          $.singlequoted_attribute_value,
          $.doublequoted_attribute_value,
        ),
      )),
    ),

    attribute_name: _ => /[^<>"'/=\s]+/,

    unquoted_attribute_value: $ => seq(
      choice(
        alias($._unquoted_attribute_entity, $.entity),
        /[^<>"'=\s&]+/,
        $._attribute_ampersand,
      ),
      repeat(choice(
        alias($._attribute_entity, $.entity),
        $._unquoted_attribute_fragment,
        $._attribute_ampersand,
      )),
    ),

    entity: _ => token(/&(#([xX][0-9a-fA-F]+|[0-9]+)|[A-Za-z][A-Za-z0-9]*);?/),

    singlequoted_attribute_value: $ => seq('\'', optional(alias(repeat1(choice(
      alias($._attribute_entity, $.entity),
      token.immediate(/[^'&]+/),
      $._attribute_ampersand,
    )), $.attribute_value)), '\''),

    doublequoted_attribute_value: $ => seq('"', optional(alias(repeat1(choice(
      alias($._attribute_entity, $.entity),
      token.immediate(/[^"&]+/),
      $._attribute_ampersand,
    )), $.attribute_value)), '"'),

    text: _ => token(prec(1, /[^<&]+/)),
  },
});