Class: Plist::StreamParser

Inherits:
Object
  • Object
show all
Defined in:
lib/searchlink/plist.rb

Constant Summary collapse

TEXT = 
/([^<]+)/.freeze
XMLDECL_PATTERN = 
/<\?xml\s+(.*?)\?>*/um.freeze
DOCTYPE_PATTERN = 
/\s*<!DOCTYPE\s+(.*?)(\[|>)/um.freeze
COMMENT_START = 
/\A<!--/u.freeze
COMMENT_END = 
/.*?-->/um.freeze

Instance Method Summary collapse

Constructor Details

#initialize(plist_data_or_file, listener) ⇒ StreamParser

Returns a new instance of StreamParser.



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# File 'lib/searchlink/plist.rb', line 48

def initialize(plist_data_or_file, listener)
  @xml = if plist_data_or_file.respond_to? :read
           plist_data_or_file.read
         elsif File.exist? plist_data_or_file
           File.read(plist_data_or_file)
         else
           plist_data_or_file
         end

  @listener = listener
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/searchlink/plist.rb', line 66

def parse
  plist_tags = PTag.mappings.keys.join('|')
  start_tag  = /<(#{plist_tags})([^>]*)>/i
  end_tag    = %r{</(#{plist_tags})[^>]*>}i

  require 'strscan'

  @scanner = StringScanner.new(@xml)
  until @scanner.eos?
    if @scanner.scan(COMMENT_START)
      @scanner.scan(COMMENT_END)
    elsif @scanner.scan(XMLDECL_PATTERN)
    elsif @scanner.scan(DOCTYPE_PATTERN)
    elsif @scanner.scan(start_tag)
      @listener.tag_start(@scanner[1], nil)
      @listener.tag_end(@scanner[1]) if @scanner[2] =~ %r{/$}
    elsif @scanner.scan(TEXT)
      @listener.text(@scanner[1])
    elsif @scanner.scan(end_tag)
      @listener.tag_end(@scanner[1])
    else
      raise 'Unimplemented element'
    end
  end
end