Source Code for Module lepl.core._test.clone

 1  from lepl.matchers.variables import TraceVariables 
 2  from lepl.lexer.matchers import Token 
 3  from lepl.support.list import List 
 4   
 5  # The contents of this file are subject to the Mozilla Public License 
 6  # (MPL) Version 1.1 (the "License"); you may not use this file except 
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14  # 
15  # The Original Code is LEPL (http://www.acooke.org/lepl) 
16  # The Initial Developer of the Original Code is Andrew Cooke. 
17  # Portions created by the Initial Developer are Copyright (C) 2009-2010 
18  # Andrew Cooke (andrew@acooke.org). All Rights Reserved. 
19  # 
20  # Alternatively, the contents of this file may be used under the terms 
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23  # of the LGPL License are applicable instead of those above. 
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32   
33  ''' 
34  Tests for cloning matchers. 
35  ''' 
36   
37  from unittest import TestCase 
38  from difflib import Differ 
39   
40  from lepl.matchers.core import Literal, Delayed 
41  from lepl.matchers.derived import Drop, UnsignedReal, Optional 
42  from lepl.core.rewriters import clone_matcher 
43   
44   
45 -class CloneTest(TestCase): 
46       
47 -    def assert_clone_ok(self, matcher): 
48          copy = clone_matcher(matcher) 
49          mtree = matcher.tree() 
50          ctree = copy.tree() 
51          if mtree != ctree: 
52              print(mtree) 
53              print(ctree) 
54              diff = Differ() 
55              print('\n'.join(diff.compare(mtree.split('\n'), ctree.split('\n')))) 
56          assert mtree == ctree 
57          assert matcher is not copy 
58   
59 -    def test_single(self): 
60          self.assert_clone_ok(Literal('foo')) 
61   
62 -    def test_no_loop(self): 
63          self.assert_clone_ok(Literal('a') | 'b' & Drop('c')) 
64           
65 -    def test_delayed(self): 
66          d = Delayed() 
67          d += Literal('foo') 
68          self.assert_clone_ok(d) 
69          self.assert_clone_ok(Literal('bar') & d) 
70       
71 -    def test_loop(self): 
72          d = Delayed() 
73          a = d | 'b' 
74          d += a 
75          self.assert_clone_ok(d) 
76           
77 -    def test_loops(self): 
78          with TraceVariables(): 
79              value = Token(UnsignedReal()) 
80              symbol = Token('[^0-9a-zA-Z \t\r\n]') 
81              number = (Optional(symbol('-')) + value) >> float 
82              group2, group3c = Delayed(), Delayed() 
83       
84              parens = symbol('(') & group3c & symbol(')') 
85              group1 = parens | number 
86       
87              mul = (group2 & symbol('*') & group2) > List     # changed 
88              div = (group2 & symbol('/') & group2) > List     # changed 
89              group2 += (mul | div | group1) 
90       
91              add = (group3c & symbol('+') & group3c) > List   # changed 
92              sub = (group3c & symbol('-') & group3c) > List   # changed 
93              group3c += (add | sub | group2) 
94          self.assert_clone_ok(group3c) 
95