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tc_parser.rb
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tc_parser.rb
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# Author: Chris Wailes <chris.wailes@gmail.com>
# Project: Ruby Language Toolkit
# Date: 2011/04/06
# Description: This file contains unit tests for the RLTK::Parser class.
############
# Requires #
############
# Standard Library
require 'test/unit'
require 'tmpdir'
# Ruby Language Toolkit
require 'rltk/lexer'
require 'rltk/parser'
require 'rltk/lexers/calculator'
require 'rltk/parsers/prefix_calc'
require 'rltk/parsers/infix_calc'
require 'rltk/parsers/postfix_calc'
#######################
# Classes and Modules #
#######################
class ParserTester < Test::Unit::TestCase
class ABLexer < RLTK::Lexer
rule(/a/) { [:A, 1] }
rule(/b/) { [:B, 2] }
rule(/\s/)
end
class AlphaLexer < RLTK::Lexer
rule(/[A-Za-z]/) { |t| [t.upcase.to_sym, t] }
rule(/,/) { :COMMA }
rule(/\s/)
end
class APlusBParser < RLTK::Parser
production(:a, 'A+ B') { |a, _| a.length }
finalize
end
class AQuestionBParser < RLTK::Parser
production(:a, 'A? B') { |a, _| a }
finalize
end
class AStarBParser < RLTK::Parser
production(:a, 'A* B') { |a, _| a.length }
finalize
end
class AmbiguousParser < RLTK::Parser
production(:e) do
clause('NUM') {|n| n}
clause('e PLS e') { |e0, _, e1| e0 + e1 }
clause('e SUB e') { |e0, _, e1| e0 - e1 }
clause('e MUL e') { |e0, _, e1| e0 * e1 }
clause('e DIV e') { |e0, _, e1| e0 / e1 }
end
finalize
end
class ArrayCalc < RLTK::Parser
array_args
production(:e) do
clause('NUM') { |v| v[0] }
clause('PLS e e') { |v| v[1] + v[2] }
clause('SUB e e') { |v| v[1] - v[2] }
clause('MUL e e') { |v| v[1] * v[2] }
clause('DIV e e') { |v| v[1] / v[2] }
end
finalize
end
class EmptyListParser0 < RLTK::Parser
empty_list('list', ['A'], :COMMA)
finalize
end
class EmptyListParser1 < RLTK::Parser
array_args
empty_list('list', ['A', 'B', 'C D'], :COMMA)
finalize
end
class NonEmptyListParser0 < RLTK::Parser
nonempty_list('list', ['A'], :COMMA)
finalize
end
class NonEmptyListParser1 < RLTK::Parser
nonempty_list('list', ['A', 'B'], :COMMA)
finalize
end
class NonEmptyListParser2 < RLTK::Parser
nonempty_list('list', ['A', 'B', 'C D'], :COMMA)
finalize
end
class NonEmptyListParser3 < RLTK::Parser
nonempty_list('list', ['A+'], :COMMA)
finalize
end
class DummyError1 < StandardError; end
class DummyError2 < StandardError; end
class ErrorCalc < RLTK::Parser
production(:e) do
clause('NUM') {|n| n}
clause('e PLS e') { |e0, _, e1| e0 + e1 }
clause('e SUB e') { |e0, _, e1| e0 - e1 }
clause('e MUL e') { |e0, _, e1| e0 * e1 }
clause('e DIV e') { |e0, _, e1| e0 / e1 }
clause('e PLS ERROR') { |_, _, _| raise DummyError1 }
clause('e SUB ERROR') { |_, _, _| raise DummyError2 }
end
finalize
end
class ELLexer < RLTK::Lexer
rule(/\n/) { :NEWLINE }
rule(/;/) { :SEMI }
rule(/\s/)
rule(/[A-Za-z]+/) { |t| [:WORD, t] }
end
class ErrorLine < RLTK::Parser
production(:s, 'line*') { |l| l }
production(:line) do
clause('NEWLINE') { |_| nil }
clause('WORD+ SEMI NEWLINE') { |w, _, _| w }
clause('WORD+ ERROR NEWLINE') { |w, e, _| error(pos(1).line_number); w }
end
finalize
end
class RotatingCalc < RLTK::Parser
production(:e) do
clause('NUM') {|n| n}
clause('PLS e e') { |_, e0, e1| e0.send(get_op(:+), e1) }
clause('SUB e e') { |_, e0, e1| e0.send(get_op(:-), e1) }
clause('MUL e e') { |_, e0, e1| e0.send(get_op(:*), e1) }
clause('DIV e e') { |_, e0, e1| e0.send(get_op(:/), e1) }
end
class Environment < Environment
def initialize
@map = { :+ => 0, :- => 1, :* => 2, :/ => 3 }
@ops = [ :+, :-, :*, :/ ]
end
def get_op(orig_op)
new_op = @ops[@map[orig_op]]
@ops = @ops[1..-1] << @ops[0]
new_op
end
end
finalize
end
def test_ambiguous_grammar
actual = AmbiguousParser.parse(RLTK::Lexers::Calculator.lex('1 + 2 * 3'), {:accept => :all})
assert_equal([7, 9], actual.sort)
end
def test_array_args
actual = ArrayCalc.parse(RLTK::Lexers::Calculator.lex('+ 1 2'))
assert_equal(3, actual)
actual = ArrayCalc.parse(RLTK::Lexers::Calculator.lex('+ 1 * 2 3'))
assert_equal(7, actual)
actual = ArrayCalc.parse(RLTK::Lexers::Calculator.lex('* + 1 2 3'))
assert_equal(9, actual)
end
def test_ebnf_parsing
################
# APlusBParser #
################
assert_raise(RLTK::NotInLanguage) { APlusBParser.parse(ABLexer.lex('b')) }
assert_equal(1, APlusBParser.parse(ABLexer.lex('ab')))
assert_equal(2, APlusBParser.parse(ABLexer.lex('aab')))
assert_equal(3, APlusBParser.parse(ABLexer.lex('aaab')))
assert_equal(4, APlusBParser.parse(ABLexer.lex('aaaab')))
####################
# AQuestionBParser #
####################
assert_raise(RLTK::NotInLanguage) { AQuestionBParser.parse(ABLexer.lex('aab')) }
assert_nil(AQuestionBParser.parse(ABLexer.lex('b')))
assert_not_nil(AQuestionBParser.parse(ABLexer.lex('ab')))
################
# AStarBParser #
################
assert_equal(0, AStarBParser.parse(ABLexer.lex('b')))
assert_equal(1, AStarBParser.parse(ABLexer.lex('ab')))
assert_equal(2, AStarBParser.parse(ABLexer.lex('aab')))
assert_equal(3, AStarBParser.parse(ABLexer.lex('aaab')))
assert_equal(4, AStarBParser.parse(ABLexer.lex('aaaab')))
end
def test_empty_list
####################
# EmptyListParser0 #
####################
expected = []
actual = EmptyListParser0.parse(AlphaLexer.lex(''))
assert_equal(expected, actual)
####################
# EmptyListParser1 #
####################
expected = ['a', 'b', ['c', 'd']]
actual = EmptyListParser1.parse(AlphaLexer.lex('a, b, c d'))
assert_equal(expected, actual)
end
def test_environment
actual = RotatingCalc.parse(RLTK::Lexers::Calculator.lex('+ 1 2'))
assert_equal(3, actual)
actual = RotatingCalc.parse(RLTK::Lexers::Calculator.lex('/ 1 * 2 3'))
assert_equal(7, actual)
actual = RotatingCalc.parse(RLTK::Lexers::Calculator.lex('- + 1 2 3'))
assert_equal(9, actual)
parser = RotatingCalc.new
actual = parser.parse(RLTK::Lexers::Calculator.lex('+ 1 2'))
assert_equal(3, actual)
actual = parser.parse(RLTK::Lexers::Calculator.lex('/ 1 2'))
assert_equal(3, actual)
end
def test_error_productions
assert_raise(DummyError1) { ErrorCalc.parse(RLTK::Lexers::Calculator.lex('1 + +')) }
assert_raise(DummyError2) { ErrorCalc.parse(RLTK::Lexers::Calculator.lex('1 - +')) }
test_string = "first line;\n"
test_string += "second line\n"
test_string += "third line;\n"
test_string += "fourth line\n"
assert_raise(RLTK::HandledError) { ErrorLine.parse(ELLexer.lex(test_string)) }
begin
ErrorLine.parse(ELLexer.lex(test_string))
rescue RLTK::HandledError => e
assert_equal(e.errors, [2,4])
end
end
def test_infix_calc
actual = RLTK::Parsers::InfixCalc.parse(RLTK::Lexers::Calculator.lex('1 + 2'))
assert_equal(3, actual)
actual = RLTK::Parsers::InfixCalc.parse(RLTK::Lexers::Calculator.lex('1 + 2 * 3'))
assert_equal(7, actual)
actual = RLTK::Parsers::InfixCalc.parse(RLTK::Lexers::Calculator.lex('(1 + 2) * 3'))
assert_equal(9, actual)
assert_raise(RLTK::NotInLanguage) { RLTK::Parsers::InfixCalc.parse(RLTK::Lexers::Calculator.lex('1 2 + 3 *')) }
end
def test_input
assert_raise(RLTK::BadToken) { RLTK::Parsers::InfixCalc.parse(RLTK::Lexers::EBNF.lex('A B C')) }
end
def test_nonempty_list
#######################
# NonEmptyListParser0 #
#######################
expected = ['a']
actual = NonEmptyListParser0.parse(AlphaLexer.lex('a'))
assert_equal(expected, actual)
expected = ['a', 'a']
actual = NonEmptyListParser0.parse(AlphaLexer.lex('a, a'))
assert_equal(expected, actual)
assert_raise(RLTK::NotInLanguage) { NonEmptyListParser0.parse(AlphaLexer.lex('')) }
assert_raise(RLTK::NotInLanguage) { NonEmptyListParser0.parse(AlphaLexer.lex(',')) }
assert_raise(RLTK::NotInLanguage) { NonEmptyListParser0.parse(AlphaLexer.lex('aa')) }
assert_raise(RLTK::NotInLanguage) { NonEmptyListParser0.parse(AlphaLexer.lex('a,')) }
assert_raise(RLTK::NotInLanguage) { NonEmptyListParser0.parse(AlphaLexer.lex(',a')) }
#######################
# NonEmptyListParser1 #
#######################
expected = ['a']
actual = NonEmptyListParser1.parse(AlphaLexer.lex('a'))
assert_equal(expected, actual)
expected = ['b']
actual = NonEmptyListParser1.parse(AlphaLexer.lex('b'))
assert_equal(expected, actual)
expected = ['a', 'b', 'a', 'b']
actual = NonEmptyListParser1.parse(AlphaLexer.lex('a, b, a, b'))
assert_equal(expected, actual)
assert_raise(RLTK::NotInLanguage) { NonEmptyListParser1.parse(AlphaLexer.lex('a b')) }
#######################
# NonEmptyListParser2 #
#######################
expected = ['a']
actual = NonEmptyListParser2.parse(AlphaLexer.lex('a'))
assert_equal(expected, actual)
expected = ['b']
actual = NonEmptyListParser2.parse(AlphaLexer.lex('b'))
assert_equal(expected, actual)
expected = [['c', 'd']]
actual = NonEmptyListParser2.parse(AlphaLexer.lex('c d'))
assert_equal(expected, actual)
expected = [['c', 'd'], ['c', 'd']]
actual = NonEmptyListParser2.parse(AlphaLexer.lex('c d, c d'))
assert_equal(expected, actual)
expected = ['a', 'b', ['c', 'd']]
actual = NonEmptyListParser2.parse(AlphaLexer.lex('a, b, c d'))
assert_equal(expected, actual)
assert_raise(RLTK::NotInLanguage) { NonEmptyListParser2.parse(AlphaLexer.lex('c')) }
assert_raise(RLTK::NotInLanguage) { NonEmptyListParser2.parse(AlphaLexer.lex('d')) }
#######################
# NonEmptyListParser3 #
#######################
expected = [['a'], ['a', 'a'], ['a', 'a', 'a']]
actual = NonEmptyListParser3.parse(AlphaLexer.lex('a, aa, aaa'))
assert_equal(expected, actual)
end
def test_postfix_calc
actual = RLTK::Parsers::PostfixCalc.parse(RLTK::Lexers::Calculator.lex('1 2 +'))
assert_equal(3, actual)
actual = RLTK::Parsers::PostfixCalc.parse(RLTK::Lexers::Calculator.lex('1 2 3 * +'))
assert_equal(7, actual)
actual = RLTK::Parsers::PostfixCalc.parse(RLTK::Lexers::Calculator.lex('1 2 + 3 *'))
assert_equal(9, actual)
assert_raise(RLTK::NotInLanguage) { RLTK::Parsers::InfixCalc.parse(RLTK::Lexers::Calculator.lex('* + 1 2 3')) }
end
def test_prefix_calc
actual = RLTK::Parsers::PrefixCalc.parse(RLTK::Lexers::Calculator.lex('+ 1 2'))
assert_equal(3, actual)
actual = RLTK::Parsers::PrefixCalc.parse(RLTK::Lexers::Calculator.lex('+ 1 * 2 3'))
assert_equal(7, actual)
actual = RLTK::Parsers::PrefixCalc.parse(RLTK::Lexers::Calculator.lex('* + 1 2 3'))
assert_equal(9, actual)
assert_raise(RLTK::NotInLanguage) { RLTK::Parsers::PrefixCalc.parse(RLTK::Lexers::Calculator.lex('1 + 2 * 3')) }
end
def test_use
tmpfile = File.join(Dir.tmpdir, 'usetest')
parser0 = Class.new(RLTK::Parser) do
production(:a, 'A+') { |a| a.length }
finalize :use => tmpfile
end
result0 = parser0.parse(ABLexer.lex('a'))
assert(File.exist?(tmpfile), 'Serialized parser file not found.')
parser1 = Class.new(RLTK::Parser) do
production(:a, 'A+') { |a| a.length }
finalize :use => tmpfile
end
result1 = parser1.parse(ABLexer.lex('a'))
assert_equal(result0, result1)
File.unlink(tmpfile)
end
end