### Home Classes Methods

### In Files

- lib/kramdown/parser/html.rb

### Methods

- #handle_html_start_tag
- #handle_raw_html_tag
- #parse_raw_html

### Included Modules

- Kramdown::Parser::Html::Constants

### Class/Module Index

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# Kramdown::Parser::Html::Parser

Contains the parsing methods. This module can be mixed into any parser to get HTML parsing functionality. The only thing that must be provided by the class are instance variable @stack for storing the needed state and @src (instance of StringScanner) for the actual parsing.

### Public Instance Methods

handle_html_start_tag() click to toggle source

Process the HTML start tag that has already be scanned/checked via @src.

Does the common processing steps and then yields to the caller for further processing (first parameter is the created element; the second parameter is `true` if the HTML element is already closed, ie. contains no body; the third parameter specifies whether the body - and the end tag - need to be handled in case closed=false).

    # File lib/kramdown/parser/html.rb, line 76
    def handle_html_start_tag # :yields: el, closed, handle_body
      name = @src[1].downcase
      closed = !@src[4].nil?
      attrs = Utils::OrderedHash.new
      @src[2].scan(HTML_ATTRIBUTE_RE).each {|attr,sep,val| attrs[attr.downcase] = val || ""}

      el = Element.new(:html_element, name, attrs, :category => :block)
      @tree.children << el

      if !closed && HTML_ELEMENTS_WITHOUT_BODY.include?(el.value)
        warning("The HTML tag '#{el.value}' cannot have any content - auto-closing it")
        closed = true
      end
      if name == 'script' || name == 'style'
        handle_raw_html_tag(name)
        yield(el, false, false)
      else
        yield(el, closed, true)
      end
    end

handle_raw_html_tag(name) click to toggle source

Handle the raw HTML tag at the current position.

    # File lib/kramdown/parser/html.rb, line 98
    def handle_raw_html_tag(name)
      curpos = @src.pos
      if @src.scan_until(/(?=<\/#{name}\s*>)/i)
        add_text(extract_string(curpos...@src.pos, @src), @tree.children.last, :raw)
        @src.scan(HTML_TAG_CLOSE_RE)
      else
        add_text(@src.rest, @tree.children.last, :raw)
        @src.terminate
        warning("Found no end tag for '#{name}' - auto-closing it")
      end
    end

parse_raw_html(el, &block) click to toggle source

Parse raw HTML from the current source position, storing the found elements in `el`. Parsing continues until one of the following criteria are fulfilled:

- The end of the document is reached.

- The matching end tag for the element `el` is found (only used if `el` is an HTML element).

When an HTML start tag is found, processing is deferred to handle_html_start_tag, providing the block given to this method.

    # File lib/kramdown/parser/html.rb, line 121
    def parse_raw_html(el, &block)
      @stack.push(@tree)
      @tree = el

      done = false
      while !@src.eos? && !done
        if result = @src.scan_until(HTML_RAW_START)
          add_text(result, @tree, :text)
          if result = @src.scan(HTML_COMMENT_RE)
            @tree.children << Element.new(:xml_comment, result, nil, :category => :block)
          elsif result = @src.scan(HTML_INSTRUCTION_RE)
            @tree.children << Element.new(:xml_pi, result, nil, :category => :block)
          elsif @src.scan(HTML_TAG_RE)
            handle_html_start_tag(&block)
          elsif @src.scan(HTML_TAG_CLOSE_RE)
            if @tree.value == @src[1].downcase
              done = true
            else
              warning("Found invalidly used HTML closing tag for '#{@src[1].downcase}' - ignoring it")
            end
          else
            add_text(@src.getch, @tree, :text)
          end
        else
          add_text(@src.rest, @tree, :text)
          @src.terminate
          warning("Found no end tag for '#{@tree.value}' - auto-closing it") if @tree.type == :html_element
          done = true
        end
      end

      @tree = @stack.pop
    end

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