require 'active_support/core_ext/object/blank' require 'active_support/ordered_hash' require 'active_support/core_ext/string/inflections' module RailsGuides class Indexer attr_reader :body, :result, :warnings, :level_hash def initialize(body, warnings) @body = body @result = @body.dup @warnings = warnings end def index @level_hash = process(body) end private def process(string, current_level=3, counters=[1]) s = StringScanner.new(string) level_hash = ActiveSupport::OrderedHash.new while !s.eos? re = %r{^h(\d)(?:\((#.*?)\))?\s*\.\s*(.*)$} s.match?(re) if matched = s.matched matched =~ re level, idx, title = $1.to_i, $2, $3.strip if level < current_level # This is needed. Go figure. return level_hash elsif level == current_level index = counters.join(".") idx ||= '#' + title_to_idx(title) raise "Parsing Fail" unless @result.sub!(matched, "h#{level}(#{idx}). #{index} #{title}") key = { :title => title, :id => idx } # Recurse counters << 1 level_hash[key] = process(s.post_match, current_level + 1, counters) counters.pop # Increment the current level last = counters.pop counters << last + 1 end end s.getch end level_hash end def title_to_idx(title) idx = title.strip.parameterize.sub(/^\d+/, '') if warnings && idx.blank? puts "BLANK ID: please put an explicit ID for section #{title}, as in h5(#my-id)" end idx end end end