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#!/usr/bin/env python3
import base, unittest
from ptk.parser import ParseError, leftAssoc, rightAssoc, nonAssoc
from ptk.deferred_parser import DeferredLRParser
from ptk.lexer import token, EOF
from ptk.deferred_lexer import DeferredLexer
from ptk.grammar import production
from twisted.internet.defer import succeed
# XXXTODO factorize this with test_parser.py
class TestedDeferredParser(DeferredLRParser, DeferredLexer):
def __init__(self, *args, **kwargs):
self.seen = list()
super().__init__(*args, **kwargs)
@token('[1-9][0-9]*')
def number(self, tok):
tok.value = int(tok.value)
@production('E -> E<left> "+" E<right>')
def sum(self, left, right):
self.seen.append(('+', left, right))
return succeed(left + right)
@production('E -> E<left> "*" E<right>')
def mult(self, left, right):
self.seen.append(('*', left, right))
return succeed(left * right)
@production('E -> number<n>')
def litteral(self, n):
return succeed(n)
def deferNewSentence(self, sentence):
return succeed(None)
class DeferredParserTestCase(unittest.TestCase):
def parse(self, inputString):
def realizeDeferred(d):
self.assertTrue(d.called)
results = [None, None]
def success(result):
results[0] = result
def error(reason):
results[1] = reason
d.addCallback(success)
d.addErrback(error)
if results[1] is not None:
raise results[1].value
return results[0]
for char in inputString:
d = self.parser.deferFeed(char)
realizeDeferred(d)
d = self.parser.deferFeed(EOF)
realizeDeferred(d)
class DefaultShiftReduceDeferredTestCase(DeferredParserTestCase):
def setUp(self):
self.parser = TestedDeferredParser()
def test_shift(self):
self.parse('2+3*4')
self.assertEqual(self.parser.seen, [('*', 3, 4), ('+', 2, 12)])
class DefaultReduceReduceDeferredTestCase(DeferredParserTestCase):
def setUp(self):
class Parser(DeferredLRParser, DeferredLexer):
def __init__(self, *args, **kwargs):
self.seen = list()
super().__init__(*args, **kwargs)
@token('[a-zA-Z]+')
def word(self, tok):
pass
@production('sequence -> maybeword | sequence word |')
def seq(self):
self.seen.append('seq')
@production('maybeword -> word |')
def maybe(self):
self.seen.append('maybe')
def deferNewSentence(self, sentence):
return succeed(None)
self.parser = Parser()
def test_reduce(self):
self.parse('')
self.assertEqual(self.parser.seen, ['seq'])
class LeftAssociativityDeferredTestCase(DeferredParserTestCase):
def setUp(self):
@leftAssoc('+')
class Parser(TestedDeferredParser):
pass
self.parser = Parser()
def test_assoc(self):
self.parse('1+2+3')
self.assertEqual(self.parser.seen, [('+', 1, 2), ('+', 3, 3)])
class RightAssociativityDeferredTestCase(DeferredParserTestCase):
def setUp(self):
@rightAssoc('+')
class Parser(TestedDeferredParser):
pass
self.parser = Parser()
def test_assoc(self):
self.parse('1+2+3')
self.assertEqual(self.parser.seen, [('+', 2, 3), ('+', 1, 5)])
class PrecedenceDeferredTestCase(DeferredParserTestCase):
def setUp(self):
@leftAssoc('+')
@leftAssoc('*')
@nonAssoc('<')
class Parser(TestedDeferredParser):
@production('E -> E "<" E')
def inf(self):
return succeed(None)
self.parser = Parser()
def test_shift(self):
self.parse('2+3*4')
self.assertEqual(self.parser.seen, [('*', 3, 4), ('+', 2, 12)])
def test_reduce(self):
self.parse('2*3+4')
self.assertEqual(self.parser.seen, [('*', 2, 3), ('+', 6, 4)])
def test_error(self):
try:
self.parse('2 < 3 < 4')
except ParseError:
pass
else:
self.fail()
class OverridePrecedenceDeferredTestCase(DeferredParserTestCase):
def setUp(self):
@leftAssoc('+')
@leftAssoc('mult')
class Parser(DeferredLRParser, DeferredLexer):
def __init__(self, *args, **kwargs):
self.seen = list()
super().__init__(*args, **kwargs)
@token('[1-9][0-9]*')
def number(self, tok):
tok.value = int(tok.value)
@production('E -> E<left> "+" E<right>')
def sum(self, left, right):
self.seen.append(('+', left, right))
return succeed(left + right)
@production('E -> E<left> "*" E<right>', priority='mult')
def mult(self, left, right):
self.seen.append(('*', left, right))
return succeed(left * right)
@production('E -> number<n>')
def litteral(self, n):
return succeed(n)
def deferNewSentence(self, sentence):
return succeed(None)
self.parser = Parser()
def test_shift(self):
self.parse('2+3*4')
self.assertEqual(self.parser.seen, [('*', 3, 4), ('+', 2, 12)])
def test_reduce(self):
self.parse('2*3+4')
self.assertEqual(self.parser.seen, [('*', 2, 3), ('+', 6, 4)])
class ListDeferredTestCase(DeferredParserTestCase):
def setUp(self):
class Parser(DeferredLRParser, DeferredLexer):
def __init__(self, testCase):
super().__init__()
self.testCase = testCase
@token('[a-z]+')
def identifier(self, tok):
pass
@production('L -> identifier*<tokens>')
def idlist(self, tokens):
return succeed(tokens)
def deferNewSentence(self, symbol):
self.testCase.seen = symbol
return succeed(None)
self.parser = Parser(self)
self.seen = None
def test_empty(self):
self.parse('')
self.assertEqual(self.seen, [])
def test_items(self):
self.parse('a b c')
self.assertEqual(self.seen, ['a', 'b', 'c'])
class NonEmptyListDeferredTestCase(DeferredParserTestCase):
def setUp(self):
class Parser(DeferredLRParser, DeferredLexer):
def __init__(self, testCase):
super().__init__()
self.testCase = testCase
@token('[a-z]+')
def identifier(self, tok):
pass
@production('L -> identifier+<tokens>')
def idlist(self, tokens):
return succeed(tokens)
def deferNewSentence(self, symbol):
self.testCase.seen = symbol
return succeed(None)
self.parser = Parser(self)
self.seen = None
def test_empty(self):
try:
self.parse('')
except ParseError:
pass
else:
self.fail('Got %s' % self.seen)
def test_items(self):
self.parse('a b c')
self.assertEqual(self.seen, ['a', 'b', 'c'])
class SeparatorListDeferredTestCase(DeferredParserTestCase):
def setUp(self):
class Parser(DeferredLRParser, DeferredLexer):
def __init__(self, testCase):
super().__init__()
self.testCase = testCase
@token('[a-z]+')
def identifier(self, tok):
pass
@production('L -> identifier+("|")<tokens>')
def idlist(self, tokens):
return succeed(tokens)
def deferNewSentence(self, symbol):
self.testCase.seen = symbol
return succeed(None)
self.parser = Parser(self)
self.seen = None
def test_items(self):
self.parse('a | b | c')
self.assertEqual(self.seen, ['a', 'b', 'c'])
class AtMostOneDeferredTestCase(DeferredParserTestCase):
def setUp(self):
class Parser(DeferredLRParser, DeferredLexer):
def __init__(self, testCase):
super().__init__()
self.testCase = testCase
@token('[a-z]+')
def identifier(self, tok):
pass
@production('L -> identifier?<tok>')
def idlist(self, tok):
return succeed(tok)
def deferNewSentence(self, symbol):
self.testCase.seen = symbol
return succeed(None)
self.parser = Parser(self)
self.seen = 1
def test_none(self):
self.parse('')
self.assertEqual(self.seen, None)
def test_value(self):
self.parse('a')
self.assertEqual(self.seen, 'a')
def test_error(self):
try:
self.parse('a b')
except ParseError:
pass
else:
self.fail('Got %s' % self.seen)
if __name__ == '__main__':
unittest.main()
|
