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#!/usr/bin/env python3
import base, unittest
from ptk.parser import LRParser, ParseError, leftAssoc, rightAssoc, nonAssoc
from ptk.lexer import ProgressiveLexer, token, EOF
from ptk.grammar import production
class TestedParser(LRParser, ProgressiveLexer):
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 left + right
@production('E -> E<left> "*" E<right>')
def mult(self, left, right):
self.seen.append(('*', left, right))
return left * right
@production('E -> number<n>')
def litteral(self, n):
return n
def newSentence(self, sentence):
pass
class DefaultShiftReduceTestCase(unittest.TestCase):
def setUp(self):
self.parser = TestedParser()
def test_shift(self):
self.parser.parse('2+3*4')
self.assertEqual(self.parser.seen, [('*', 3, 4), ('+', 2, 12)])
class DefaultReduceReduceTestCase(unittest.TestCase):
def setUp(self):
class Parser(LRParser, ProgressiveLexer):
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 newSentence(self, sentence):
pass
self.parser = Parser()
def test_reduce(self):
self.parser.parse('')
self.assertEqual(self.parser.seen, ['seq'])
class LeftAssociativityTestCase(unittest.TestCase):
def setUp(self):
@leftAssoc('+')
class Parser(TestedParser):
pass
self.parser = Parser()
def test_assoc(self):
self.parser.parse('1+2+3')
self.assertEqual(self.parser.seen, [('+', 1, 2), ('+', 3, 3)])
class RightAssociativityTestCase(unittest.TestCase):
def setUp(self):
@rightAssoc('+')
class Parser(TestedParser):
pass
self.parser = Parser()
def test_assoc(self):
self.parser.parse('1+2+3')
self.assertEqual(self.parser.seen, [('+', 2, 3), ('+', 1, 5)])
class PrecedenceTestCase(unittest.TestCase):
def setUp(self):
@leftAssoc('+')
@leftAssoc('*')
@nonAssoc('<')
class Parser(TestedParser):
@production('E -> E "<" E')
def inf(self):
pass
self.parser = Parser()
def test_shift(self):
self.parser.parse('2+3*4')
self.assertEqual(self.parser.seen, [('*', 3, 4), ('+', 2, 12)])
def test_reduce(self):
self.parser.parse('2*3+4')
self.assertEqual(self.parser.seen, [('*', 2, 3), ('+', 6, 4)])
def test_error(self):
try:
self.parser.parse('2 < 3 < 4')
except ParseError:
pass
else:
self.fail()
class OverridePrecedenceTestCase(unittest.TestCase):
def setUp(self):
@leftAssoc('+')
@leftAssoc('mult')
class Parser(LRParser, ProgressiveLexer):
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 left + right
@production('E -> E<left> "*" E<right>', priority='mult')
def mult(self, left, right):
self.seen.append(('*', left, right))
return left * right
@production('E -> number<n>')
def litteral(self, n):
return n
def newSentence(self, sentence):
pass
self.parser = Parser()
def test_shift(self):
self.parser.parse('2+3*4')
self.assertEqual(self.parser.seen, [('*', 3, 4), ('+', 2, 12)])
def test_reduce(self):
self.parser.parse('2*3+4')
self.assertEqual(self.parser.seen, [('*', 2, 3), ('+', 6, 4)])
class LRTestCase(unittest.TestCase):
def setUp(self):
class Parser(LRParser, ProgressiveLexer):
@token('a')
def identifier(self, tok):
pass
@production('S -> G "=" D | D')
def s(self):
pass
@production('G -> "*" D | identifier')
def g(self):
pass
@production('D -> G')
def d(self):
pass
self.parser = Parser()
def test_no_conflicts(self):
self.assertEqual(self.parser.nSR, 0)
class ListTestCase(unittest.TestCase):
def setUp(self):
class Parser(LRParser, ProgressiveLexer):
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 tokens
def newSentence(self, symbol):
self.testCase.seen = symbol
self.parser = Parser(self)
self.seen = None
def test_empty(self):
self.parser.parse('')
self.assertEqual(self.seen, [])
def test_items(self):
self.parser.parse('a b c')
self.assertEqual(self.seen, ['a', 'b', 'c'])
class NonEmptyListTestCase(unittest.TestCase):
def setUp(self):
class Parser(LRParser, ProgressiveLexer):
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 tokens
def newSentence(self, symbol):
self.testCase.seen = symbol
self.parser = Parser(self)
self.seen = None
def test_empty(self):
try:
self.parser.parse('')
except ParseError:
pass
else:
self.fail('Got %s' % self.seen)
def test_items(self):
self.parser.parse('a b c')
self.assertEqual(self.seen, ['a', 'b', 'c'])
class SeparatorListTestCase(unittest.TestCase):
def setUp(self):
class Parser(LRParser, ProgressiveLexer):
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 tokens
def newSentence(self, symbol):
self.testCase.seen = symbol
self.parser = Parser(self)
self.seen = None
def test_items(self):
self.parser.parse('a | b | c')
self.assertEqual(self.seen, ['a', 'b', 'c'])
class AtMostOneTestCase(unittest.TestCase):
def setUp(self):
class Parser(LRParser, ProgressiveLexer):
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 tok
def newSentence(self, symbol):
self.testCase.seen = symbol
self.parser = Parser(self)
self.seen = 1
def test_none(self):
self.parser.parse('')
self.assertEqual(self.seen, None)
def test_value(self):
self.parser.parse('a')
self.assertEqual(self.seen, 'a')
def test_error(self):
try:
self.parser.parse('a b')
except ParseError:
pass
else:
self.fail('Got %s' % self.seen)
class InheritanceTestCase(unittest.TestCase):
def setUp(self):
class Parser(LRParser, ProgressiveLexer):
def __init__(self):
self.seen = None
super().__init__()
@token('[0-9]')
def digit(self, tok):
tok.value = int(tok.value)
@production('E -> digit<d>')
def start(self, d):
pass
def newSentence(self, symbol):
self.seen = symbol
class Child(Parser):
def start(self, d):
return d
self.parser = Child()
def test_override(self):
self.parser.parse('4')
self.assertEqual(self.parser.seen, 4)
if __name__ == '__main__':
unittest.main()
|
