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184
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1 import unittest, pprint
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2 from pyyacc import Grammar, Item, EOF
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191
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3 from ppci import Token
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184
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4
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191
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5 def genTokens(lst):
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6 for t in lst:
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7 yield Token(t, t, 0)
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184
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8
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9 class testLR(unittest.TestCase):
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10 def setUp(self):
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11 pass
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12
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13 def testSimpleGrammar(self):
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14 # 1. define a simple grammar:
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15 g = Grammar(['EOF', 'identifier', '(', ')', '+', '*'])
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16 g.add_production('input', ['expression'])
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17 g.add_production('expression', ['term'])
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18 g.add_production('expression', ['expression', '+', 'term'])
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19 g.add_production('term', ['factor'])
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20 g.add_production('term', ['term', '*', 'factor'])
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21 g.add_production('factor', ['(', 'expression', ')'])
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22 g.add_production('factor', ['identifier'])
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23 g.start_symbol = 'input'
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24 # 2. define input:
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25 tokens = genTokens(['identifier', '+', 'identifier', '+', 'identifier'])
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184
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26 # 3. build parser:
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27 p = g.genParser()
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28 # 4. feed input:
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29 p.parse(tokens)
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30
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185
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31 class testExpressionGrammar(unittest.TestCase):
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32 def setUp(self):
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33 g = Grammar(['EOF', 'identifier', '(', ')', '+', '*', 'num'])
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34 g.add_production('input', ['expression'])
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35 g.add_production('expression', ['term'])
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36 g.add_production('expression', ['expression', '+', 'term'])
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37 g.add_production('term', ['factor'])
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38 g.add_production('term', ['term', '*', 'factor'])
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39 g.add_production('factor', ['(', 'expression', ')'])
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40 g.add_production('factor', ['identifier'])
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41 g.add_production('factor', ['num'])
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42 g.start_symbol = 'input'
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43 self.g = g
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44
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45 def testFirstSimpleGrammar(self):
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46 # 1. define a simple grammar:
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47 first = self.g.calcFirstSets()
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48 self.assertEqual(first['input'], {'identifier', '(', 'num'})
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49 self.assertEqual(first['term'], {'identifier', '(', 'num'})
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50
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51 def testCanonical(self):
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52 s0 = self.g.initialItemSet()
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53 s, gt = self.g.genCanonicalSet(s0)
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54 # Must result in 12 sets:
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55 self.assertEqual(len(s), 24)
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56
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184
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57 class testPG(unittest.TestCase):
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58 """ Tests several parts of the parser generator """
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59 def setUp(self):
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60 g = Grammar(['(', ')'])
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61 g.add_production('goal', ['list'])
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62 g.add_production('list', ['list', 'pair'])
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63 g.add_production('list', ['pair'])
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64 g.add_production('pair', ['(', 'pair', ')'])
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65 g.add_production('pair', ['(', ')'])
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66 g.start_symbol = 'goal'
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67 self.g = g
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68
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69 def testFirstSet(self):
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70 for a in ['(', ')', EOF, 'EPS']:
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71 self.assertEqual(self.g.first[a], {a})
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72 for nt in ['list', 'pair', 'goal']:
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73 self.assertEqual(self.g.first[nt], {'('})
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74
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75 def testInitItemSet(self):
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76 p0, p1, p2, p3, p4 = self.g.productions
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77 s0 = self.g.initialItemSet()
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78 self.assertEqual(len(s0), 9) # 9 with the goal rule included!
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79 self.assertIn(Item(p0, 0, EOF), s0)
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80 self.assertIn(Item(p1, 0, EOF), s0)
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81 self.assertIn(Item(p1, 0, '('), s0)
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82 self.assertIn(Item(p2, 0, EOF), s0)
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83 self.assertIn(Item(p2, 0, '('), s0)
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84 self.assertIn(Item(p3, 0, EOF), s0)
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85 self.assertIn(Item(p3, 0, '('), s0)
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86 self.assertIn(Item(p4, 0, EOF), s0)
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87 self.assertIn(Item(p4, 0, '('), s0)
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88
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89 def testCanonical(self):
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90 s0 = self.g.initialItemSet()
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91 s, gt = self.g.genCanonicalSet(s0)
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92 # Must result in 12 sets:
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93 self.assertEqual(len(s), 12)
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94
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95 def testClosure(self):
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96 p0, p1, p2, p3, p4 = self.g.productions
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97 s0 = set()
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98 s0.add(Item(p0, 0, EOF))
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99 self.assertEqual(len(s0), 1) # 1 rule
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100 self.assertIn(Item(p0, 0, EOF), s0)
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101
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102 # Invoke closure on set:
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103 s0 = self.g.closure(s0)
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104 self.assertIn(Item(p0, 0, EOF), s0)
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105 self.assertIn(Item(p1, 0, EOF), s0)
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106 self.assertIn(Item(p1, 0, '('), s0)
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107 self.assertIn(Item(p2, 0, EOF), s0)
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108 self.assertIn(Item(p2, 0, '('), s0)
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109 self.assertIn(Item(p3, 0, EOF), s0)
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110 self.assertIn(Item(p3, 0, '('), s0)
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111 self.assertIn(Item(p4, 0, EOF), s0)
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112 self.assertIn(Item(p4, 0, '('), s0)
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113
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114 def testParser(self):
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191
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115 tokens = ['(', '(', ')', ')', '(', ')']
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116 # 3. build parser:
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117 p = self.g.genParser()
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118 self.assertEqual(len(p.goto_table), 5)
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119 self.assertEqual(len(p.action_table), 19)
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120
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121 # 4. feed input:
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122 p.parse(genTokens(tokens))
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123
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124 if __name__ == '__main__':
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125 unittest.main()
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126
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127
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