module Webgen::ContentProcessor::Fragments

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

Constants

HTML_ATTR_REGEXP
HTML_HEADER_REGEXP

Public Class Methods

call(context) click to toggle source

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.

# File lib/webgen/content_processor/fragments.rb, line 14
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) click to toggle source

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.

# File lib/webgen/content_processor/fragments.rb, line 63
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) click to toggle source

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.

# File lib/webgen/content_processor/fragments.rb, line 31
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