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#!/usr/bin/env python3
import base, unittest
from ptk.grammar import Production, GrammarError, Grammar, production
from ptk.lexer import token
from ptk.parser import ProductionParser
from ptk.utils import callbackByName
class GrammarUnderTest(Grammar):
tokens = set()
@classmethod
def addTokenType(cls, name, callback, regex, types=None):
if types is None:
cls.tokens.add(name)
else:
for name in types:
cls.tokens.add(name)
@classmethod
def tokenTypes(cls):
return cls.tokens
@classmethod
def _createProductionParser(cls, name, priority, attrs):
return ProductionParser(callbackByName(name), priority, cls, attrs)
class ProductionParserTestCase(unittest.TestCase):
def setUp(self):
class TestGrammar(GrammarUnderTest):
tokens = set()
self.parser = ProductionParser(None, None, TestGrammar, dict())
self.grammarClass = TestGrammar
def assertHasProduction(self, prods, prod):
for aProduction in prods:
if prod == (aProduction.name, aProduction.right):
return
self.fail('Production %s not found in %s' % (prod, prods))
def _parse(self, string):
self.parser.parse(string)
return self.grammarClass.productions()
def test_production_name(self):
prod, = self._parse('test -> A')
self.assertEqual(prod.name, 'test')
def test_production_callback(self):
prod, = self._parse('test -> A')
self.assertEqual(prod.callback, None)
def test_empty_production(self):
prod, = self._parse('test -> ')
self.assertEqual(prod.right, [])
def test_empty_end(self):
prod1, prod2 = self._parse('test -> A | ')
self.assertEqual(prod1.right, ['A'])
self.assertEqual(prod2.right, [])
def test_empty_start(self):
prod1, prod2 = self._parse('test -> | A')
self.assertEqual(prod1.right, [])
self.assertEqual(prod2.right, ['A'])
def test_order(self):
prod, = self._parse('test -> A B')
self.assertEqual(prod.right, ['A', 'B'])
def test_escape_litteral(self):
prod, = self._parse(r'test -> "spam\"foo"')
self.assertEqual(prod.right, [r'spam"foo'])
def _findListSym(self, prods):
for prod in prods:
if prod.name != 'test':
return prod.name
self.fail('Cannot find list symbol in %s' % repr(prods))
def test_list(self):
prods = self._parse('test -> A* "+"')
self.assertEqual(len(prods), 4, repr(prods))
listSym = self._findListSym(prods)
self.assertHasProduction(prods, ('test', ['+']))
self.assertHasProduction(prods, (listSym, ['A']))
self.assertHasProduction(prods, (listSym, [listSym, 'A']))
self.assertHasProduction(prods, ('test', [listSym, '+']))
def test_list_not_empty(self):
prods = self._parse('test -> A+')
listSym = self._findListSym(prods)
self.assertEqual(len(prods), 3, repr(prods))
self.assertHasProduction(prods, (listSym, ['A']))
self.assertHasProduction(prods, (listSym, [listSym, 'A']))
self.assertHasProduction(prods, ('test', [listSym]))
def test_list_with_separator(self):
prods = self._parse('test -> A+(pipe)')
self.assertEqual(len(prods), 3, repr(prods))
listSym = self._findListSym(prods)
self.assertHasProduction(prods, (listSym, ['A']))
self.assertHasProduction(prods, (listSym, [listSym, 'pipe', 'A']))
self.assertHasProduction(prods, ('test', [listSym]))
def test_list_with_litteral_separator(self):
prods = self._parse('test -> A+("|")')
self.assertEqual(len(prods), 3, repr(prods))
listSym = self._findListSym(prods)
self.assertHasProduction(prods, (listSym, ['A']))
self.assertHasProduction(prods, (listSym, [listSym, '|', 'A']))
self.assertHasProduction(prods, ('test', [listSym]))
def test_atmostone(self):
prods = self._parse('test -> A?')
self.assertEqual(len(prods), 2)
self.assertHasProduction(prods, ('test', []))
self.assertHasProduction(prods, ('test', ['A']))
class ProductionTestCase(unittest.TestCase):
def setUp(self):
# A -> B<b> C
self.production = Production('A', self.callback)
self.production.addSymbol('B', 'b')
self.production.addSymbol('C')
self.calls = list()
def callback(self, grammar, **kwargs):
self.calls.append(kwargs)
return 42
def test_duplicate(self):
try:
self.production.addSymbol('D', 'b')
except GrammarError:
pass
else:
self.fail()
def test_kwargs(self):
cb, kwargs = self.production.apply([1, 2], None)
cb(self, **kwargs)
self.assertEqual(self.calls, [{'b': 1}])
class GrammarTestCase(unittest.TestCase):
def test_production(self):
class G(GrammarUnderTest):
@production('A -> B')
def a(self):
pass
prod, = G.productions()
self.assertEqual(prod.name, 'A')
self.assertEqual(prod.right, ['B'])
def test_start_symbol(self):
class G(GrammarUnderTest):
@production('A -> B')
def a(self):
pass
@production('C -> D')
def c(self):
pass
grammar = G()
self.assertEqual(grammar.startSymbol, 'A')
def test_duplicate_name(self):
class G(GrammarUnderTest):
@production('A -> B')
def a1(self):
pass
@production('A -> C')
def a2(self):
pass
prod1, prod2 = G.productions()
self.assertEqual(prod1.name, 'A')
self.assertEqual(prod1.right, ['B'])
self.assertEqual(prod2.name, 'A')
self.assertEqual(prod2.right, ['C'])
def test_token_name(self):
try:
class G(GrammarUnderTest):
tokens = set(['spam'])
@production('spam -> spam')
def spam(self):
pass
except GrammarError:
pass
else:
self.fail()
def test_duplicate_production_1(self):
class G(GrammarUnderTest):
@production('A -> B|B')
def a(self):
pass
try:
G()
except GrammarError:
pass
else:
self.fail()
def test_duplicate_production_2(self):
class G(GrammarUnderTest):
@production('A -> B')
def a1(self):
pass
@production('A -> B')
def a2(self):
pass
try:
G()
except GrammarError:
pass
else:
self.fail()
if __name__ == '__main__':
unittest.main()
|
