test_parsers.py 3.64 KB
 Eckhart Arnold committed Apr 13, 2017 1 2 #!/usr/bin/python3  di68kap committed Apr 21, 2017 3 """test_parsers.py - tests of the parsers-module of DHParser  Eckhart Arnold committed Apr 13, 2017 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25  Author: Eckhart Arnold Copyright 2017 Bavarian Academy of Sciences and Humanities Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. """ import os import sys sys.path.append(os.path.abspath('../../'))  Eckhart Arnold committed Apr 13, 2017 26 from DHParser.toolkit import compile_python_object  Eckhart Arnold committed Apr 29, 2017 27 from DHParser.parsers import compile_source  di68kap committed Apr 21, 2017 28 from DHParser.ebnf import EBNFGrammar, EBNFTransform, EBNFCompiler  29 from DHParser.dsl import compileEBNF, DHPARSER_IMPORTS  Eckhart Arnold committed Apr 13, 2017 30 31 32 33  WRITE_LOGS = True  34 class TestInfiLoopsAndRecursion:  Eckhart Arnold committed Apr 13, 2017 35  def test_direct_left_recursion(self):  36 37 38 39 40 41 42 43  minilang = """ @ whitespace = linefeed formula = [ //~ ] expr expr = expr ("+"|"-") term | term term = term ("*"|"/") factor | factor factor = /[0-9]+/~ # example: "5 + 3 * 4" """  Eckhart Arnold committed Apr 13, 2017 44  snippet = "5 + 3 * 4"  45 46  parser = compileEBNF(minilang)() assert parser  Eckhart Arnold committed Apr 29, 2017 47  syntax_tree = parser(snippet)  Eckhart Arnold committed Apr 13, 2017 48  assert not syntax_tree.collect_errors()  Eckhart Arnold committed Apr 13, 2017 49  assert snippet == str(syntax_tree)  Eckhart Arnold committed Apr 13, 2017 50 51  if WRITE_LOGS: syntax_tree.log("test_LeftRecursion_direct", '.cst')  Eckhart Arnold committed Apr 13, 2017 52  # self.minilang_parser1.log_parsing_history("test_LeftRecursion_direct")  Eckhart Arnold committed Apr 13, 2017 53 54 55 56  def test_indirect_left_recursion(self): pass  57 58 59 60  def test_inifinite_loops(self): minilang = """not_forever = { // } \n""" snippet = " " parser = compileEBNF(minilang)()  Eckhart Arnold committed Apr 29, 2017 61  syntax_tree = parser(snippet)  62 63 64  assert syntax_tree.error_flag # print(syntax_tree.collect_errors())  Eckhart Arnold committed Apr 13, 2017 65   Eckhart Arnold committed Apr 13, 2017 66 67 68 69 70 71 72 class TestRegex: def test_multilineRegex(self): mlregex = r""" regex = /\w+ # one or more alphabetical characters including the underscore [+] # followed by a plus sign \w* # possibly followed by more alpha chracters/ """  Eckhart Arnold committed Apr 29, 2017 73 74  result, messages, syntax_tree = compile_source(mlregex, None, EBNFGrammar(), EBNFTransform, EBNFCompiler('MultilineRegexTest'))  75  assert result  Eckhart Arnold committed Apr 13, 2017 76 77 78 79 80 81 82  assert not messages parser = compile_python_object(DHPARSER_IMPORTS + result, '\w+Grammar$')() node, rest = parser.regex('abc+def') assert rest == '' assert node.parser.name == "regex" assert str(node) == 'abc+def'  83 84 85 86 87 88 89 90 91 92 93 94  def test_token(self): tokenlang = r""" @whitespace = linefeed lang = "" begin_token {/\w+/ ""} end_token begin_token = "\begin{document}" end_token = "\end{document}" """ testdoc = r""" \begin{document} test \end{document} """  Eckhart Arnold committed Apr 29, 2017 95 96  result, messages, syntax_tree = compile_source(tokenlang, None, EBNFGrammar(), EBNFTransform, EBNFCompiler("TokenTest"))  97 98 99  assert result assert not messages parser = compile_python_object(DHPARSER_IMPORTS + result, '\w+Grammar$')()  Eckhart Arnold committed Apr 29, 2017 100  result = parser(testdoc)  101 102 103  # parser.log_parsing_history("test.log") assert not result.error_flag  Eckhart Arnold committed Apr 13, 2017 104   Eckhart Arnold committed Apr 13, 2017 105 if __name__ == "__main__":  di68kap committed Apr 19, 2017 106  from run import runner  Eckhart Arnold committed Apr 26, 2017 107  runner("TestInfiLoopsAndRecursion", globals())