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Contents
# frozen_string_literal: true
require_relative '../parser/parse_walker_factory'
module Rley # This module is used as a namespace
module ParseRep # This module is used as a namespace
# Utility class that helps to create a representation of a parse from
# a given Parsing object.
class ParseRepCreator
# @return [Rley::Parser::GFGParsing]
# Link to Parsing object (= results of recognizer)
attr_reader(:parsing)
# Constructor. Creates and initialize a ParseRepCreator instance.
# @return [ParseRepCreator]
def initialize(aParsingResult)
@parsing = aParsingResult
end
# Factory method that produces the representation of the parse.
# @return [Rley::PTree::ParseTree, Rley::SPPF::ParseForest]
# The parse representation.
def create(aBuilder = nil)
a_walker = walker(parsing)
a_builder = builder(parsing, aBuilder)
begin
loop do
event = a_walker.next
# puts "EVENT #{event[0]} #{event[1]}"
a_builder.receive_event(*event)
end
rescue StopIteration
# Do nothing: gobble the exception
rescue StandardError => e
if e.message =~ /^Ambiguous/
$stderr.puts parsing
end
raise e
end
a_builder.done!
a_builder.result
end
private
# Create a Parsing walker, that is, an object
# that will iterate over the relevant nodes (= parsing entries)
# of a GFGParsing
def walker(aParseResult)
walker_factory = Parser::ParseWalkerFactory.new
accept_entry = aParseResult.accepting_entry
accept_index = aParseResult.chart.last_index
walker_factory.build_walker(accept_entry, accept_index, jump_to_start)
end
# By default, when a end vertex is re-visited don't jump
# its corresponding start vertex.
def jump_to_start
false
end
end # class
end # module
end # module
# End of file
Version data entries
11 entries across 11 versions & 1 rubygems