Module: Webgen::ContentProcessor::Fragments

Defined in:
lib/webgen/content_processor/fragments.rb

Overview

Uses the HTML headers h1, h2, …, h6 (only those with valid IDs) to generate nested fragment nodes.

Constant Summary collapse

HTML_HEADER_REGEXP = 
/<h([123456])(?:>|\s([^>]*)>)(.*?)<\/h\1\s*>/i
HTML_ATTR_REGEXP = 
/\s*(\w+)\s*=\s*('|")(.+?)\2\s*/

Class Method Summary collapse

Class Method Details

.call(context) ⇒ Object

Create the nested fragment nodes from the content under the content node but only if there is no associated block or the block is named content.



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# File 'lib/webgen/content_processor/fragments.rb', line 15

def self.call(context)
  if !context[:block_name] || context[:block_name] == 'content'
    sections = parse_html_headers(context.content)
    create_fragment_nodes(context, sections, context.content_node)
  end
  context
end

.create_fragment_nodes(context, sections, parent, si = 1000) ⇒ Object

Create nested fragment nodes under parent from sections (which can be created using #parse_html_headers).

The meta info sort_info is calculated from the base si value.



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# File 'lib/webgen/content_processor/fragments.rb', line 64

def self.create_fragment_nodes(context, sections, parent, si = 1000)
  sections.each do |level, id, title, sub_sections|
    path = Webgen::Path.new(parent.alcn.sub(/#.*$/, '') + '#' + id)
    path['parent_alcn'] = parent.alcn
    path['handler'] = 'copy'
    path['pipeline'] = []
    path['no_output'] = true
    path['title'] = title
    path['sort_info'] = si = si.succ
    node = context.website.ext.path_handler.create_secondary_nodes(path, '', context.content_node.alcn).first

    create_fragment_nodes(context, sub_sections, node, si.succ)
  end
end

.parse_html_headers(content) ⇒ Object

Parse the string content for headers h1, …, h6 and return the found, nested sections.

Only those headers are used which have an id attribute set. The method returns a list of arrays with entries ‘level, id, title, sub sections’ where ‘sub sections’ is such a list again.



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# File 'lib/webgen/content_processor/fragments.rb', line 32

def self.parse_html_headers(content)
  sections = []
  stack = []
  content.scan(HTML_HEADER_REGEXP).each do |level,attrs,title|
    next if attrs.nil?
    id_attr = attrs.scan(HTML_ATTR_REGEXP).find {|name,sep,value| name == 'id'}
    next if id_attr.nil?
    id = id_attr[2]

    section = [level.to_i, id, title, []]
    success = false
    while !success
      if stack.empty?
        sections << section
        stack << section
        success = true
      elsif stack.last.first < section.first
        stack.last.last << section
        stack << section
        success = true
      else
        stack.pop
      end
    end
  end
  sections
end