Class: Gammo::FragmentParser

Inherits:
Parser
  • Object
show all
Defined in:
lib/gammo/fragment_parser.rb

Overview

Class for parsing a fragment of an HTML input and building an HTML tree.

Constant Summary

Constants inherited from Parser

Parser::ParseError

Constants included from Parser::Constants

Parser::Constants::SPECIAL_ELEMENTS

Constants included from Parser::Foreign

Parser::Foreign::BREAKOUT, Parser::Foreign::MATH_ML_ATTRIBUTE_ADJUSTMENTS, Parser::Foreign::SVG_ATTRIBUTE_ADJUSTMENTS, Parser::Foreign::SVG_TAG_NAME_ADJUSTMENTS

Instance Attribute Summary

Attributes inherited from Parser

#context, #document, #form, #frameset_ok, #head, #scripting

Instance Method Summary collapse

Methods included from Parser::Foreign

#adjust_attribute_names, #adjust_foreign_attributes, #html_integration_point?, #in_foreign_content?, #math_ml_text_integration_point?, #parse_foreign_content

Constructor Details

#initialize(input, context:, **options) ⇒ Object

Constructs a parser instance for fragment parsing algorithm.

Parameters:

Raises:

  • (Gammo::ParseError) —

    raises if context is not valid.

See Also:



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# File 'lib/gammo/fragment_parser.rb', line 12

def initialize(input, context:, **options)
  validate_context(context)
  super(input, context: context, **options)
  @root          = Node::Element.new(tag: Tags::Html, data: Tags::Html.to_s)
  @tokenizer     = Tokenizer.new(input, context: !context.namespace && context.tag.to_s)
  @open_elements = NodeStack.new([@root])
  document.append_child(@root)
  template_stack << InTemplate if context.tag == Tags::Template
  reset_insertion_mode
  while context
    if context.instance_of?(Node::Element) && context.tag == Tags::Form
      @form = context
      break
    end
    context = context.parent
  end
end

Instance Method Details

#parse ⇒ Array<Gammo::Node>

Parses a fragment of the current input and builds HTML tree from it.

Returns:

Raises:

  • (Gammo::ParseError) —

    Raised if the parser gets error while parsing.



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# File 'lib/gammo/fragment_parser.rb', line 33

def parse
  super
  parent     = context ? @root : document
  child      = parent.first_child
  collection = []
  while child
    node = child.next_sibling
    parent.remove_child(child)
    collection << child
    child = node
  end
  collection
end

#validate_context(context) ⇒ Object

Validates given context. Raises ParseError if context is not Node.

Parameters:

Raises:

  • (Gammo::ParseError) 


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# File 'lib/gammo/fragment_parser.rb', line 58

def validate_context(context)
  fail ParseError, 'given non-element node in "context"' unless context.instance_of?(Node::Element)
  unless context.tag == Tags.lookup(context.data)
    fail ParseError, "inconsistent context node, tag = #{context.tag}, data = #{Tags.lookup(context.data)}"
  end
end