Package lepl :: Package matchers :: Package _test :: Module float_bug
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Source Code for Module lepl.matchers._test.float_bug

  1   
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 11  # 
 12  # The Original Code is LEPL (http://www.acooke.org/lepl) 
 13  # The Initial Developer of the Original Code is Andrew Cooke. 
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 15  # Andrew Cooke (andrew@acooke.org). All Rights Reserved. 
 16  # 
 17  # Alternatively, the contents of this file may be used under the terms 
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 20  # of the LGPL License are applicable instead of those above. 
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 29   
 30  ''' 
 31  Tests for a weird bug when writing the float (rational at the time) matcher. 
 32   
 33  This came down to optional entries being mapped in NFA as empty transitions  
 34  from a single node.  If multiple choices were from the same node the empty 
 35  transition order was incorrect (it's ordered by node number, and the node 
 36  for the empty transition was created after other nodes, intead of before). 
 37   
 38  The fix used was to change the node creation order.  Other nodes appear to  
 39  be created correctly.  However, it would be better in the longer term, I 
 40  suspect, to use an ordered dict or similar to store the empty transitions 
 41  so that the numbering is not needed for order. 
 42  ''' 
 43   
 44  #from logging import basicConfig, DEBUG 
 45   
 46  from lepl.matchers.derived import UnsignedFloat, SignedInteger, Join 
 47  from lepl.matchers.combine import Or 
 48  from lepl.matchers.core import Any 
 49  from lepl._test.base import BaseTest 
 50   
 51   
 52  # pylint: disable-msg=C0103, C0111, C0301, W0702, C0324, C0102, C0321, W0141, R0201, R0913, R0901, R0904 
 53  # (dude this is just a test) 
 54   
 55  #basicConfig(level=DEBUG) 
 56   
 57   
58 -class FloatTest(BaseTest):
59
60 - def test_first(self):
61 self.assert_direct('1.e3', Join(UnsignedFloat(), Any('eE'), SignedInteger()), 62 [['1.e3']])
63
64 - def test_second(self):
65 self.assert_direct('1.e3', UnsignedFloat(), [['1.']])
66
67 - def test_all(self):
68 first = Join(UnsignedFloat(), Any('eE'), SignedInteger()) 69 second = UnsignedFloat() 70 all = Or(first, second) 71 all.config.default() # wrong order 72 #all.config.compile_to_dfa() # gives 1.e3 only 73 #all.config.compile_to_nfa() # wrong order 74 #all.config.no_compile_to_regexp() # ok 75 #all.config.clear() # ok 76 self.assert_direct('1.e3', all, [['1.e3'], ['1.']])
77
78 - def test_nfa(self):
79 first = Join(UnsignedFloat(), Any('eE'), SignedInteger()) 80 second = UnsignedFloat() 81 all = Or(first, second) 82 all.config.clear().compile_to_nfa() 83 m = all.get_parse()
84 #print(m.matcher) 85 #print(m.matcher.regexp) 86 87 # (?: 88 # (?: 89 # (?:[0-9] 90 # (?:[0-9])* 91 # )? 92 # \.[0-9](?:[0-9])* 93 # | 94 # [0-9](?:[0-9])*(?:\.)? 95 # ) 96 # [Ee](?:[\+\-])?[0-9](?:[0-9])* 97 # | 98 # (?: 99 # (?: 100 # [0-9](?:[0-9])* 101 # )?\.[0-9](?:[0-9])* 102 # | 103 # [0-9](?:[0-9])*\. 104 # ) 105 # ) 106 #DEBUG:lepl.regexp.core.Compiler:compiling to nfa: (?P<label>(?:(?:(?:[0-9](?:[0-9])*)?\.[0-9](?:[0-9])*|[0-9](?:[0-9])*(?:\.)?)[Ee](?:[\+\-])?[0-9](?:[0-9])*|(?:[0-9](?:[0-9])*)?\.[0-9](?:[0-9])*|[0-9](?:[0-9])*\.)) 107 #DEBUG:lepl.regexp.core.Compiler:nfa graph: 0: [0-9]->5, 10, 4, 18; 1; 2(label): 1; 3: [Ee]->14; 4: \.->7; 5: 6; 6: [0-9]->6, 4; 7: [0-9]->8; 8: 9; 9: [0-9]->9, 3; 10: [0-9]->12; 11: \.->3, 3; 12: 13; 13: [0-9]->13, 11; 14: [\+\-]->15, 15; 15: [0-9]->16; 16: 17; 17: [0-9]->17, 2; 18: [0-9]->20, 25, 19; 19: \.->22; 20: 21; 21: [0-9]->21, 19; 22: [0-9]->23; 23: 24; 24: [0-9]->24, 2; 25: [0-9]->27; 26: \.->2; 27: 28; 28: [0-9]->28, 26 108 # 0: [0-9]->5, 10, 4, 18; 109 # 1; 110 # 2(label): 1; 111 # 3: [Ee]->14; 112 # 4: \.->7; 113 # 5: 6; 114 # 6: [0-9]->6, 4; 115 # 7: [0-9]->8; 116 # 8: 9; 117 # 9: [0-9]->9, 3; 118 # 10: [0-9]->12; 119 # 11: \.->3, 3; 120 # 12: 13; 121 # 13: [0-9]->13, 11; 122 # 14: [\+\-]->15, 15; 123 # 15: [0-9]->16; 124 # 16: 17; 125 # 17: [0-9]->17, 2; 126 # 18: [0-9]->20, 25, 19; 127 # 19: \.->22; 128 # 20: 21; 129 # 21: [0-9]->21, 19; 130 # 22: [0-9]->23; 131 # 23: 24; 132 # 24: [0-9]->24, 2; 133 # 25: [0-9]->27; 134 # 26: \.->2; 135 # 27: 28; 136 # 28: [0-9]->28, 26 137