#!/usr/bin/python3 """test_parsers.py - tests of the parsers-module of DHParser 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('../../')) from DHParser.toolkit import compile_python_object from DHParser.parsers import compile_source from DHParser.ebnf import EBNFGrammar, EBNFTransform, EBNFCompiler from DHParser.dsl import compileEBNF, DHPARSER_IMPORTS WRITE_LOGS = True class TestInfiLoopsAndRecursion: def test_direct_left_recursion(self): minilang = """ @ whitespace = linefeed formula = [ //~ ] expr expr = expr ("+"|"-") term | term term = term ("*"|"/") factor | factor factor = /[0-9]+/~ # example: "5 + 3 * 4" """ snippet = "5 + 3 * 4" parser = compileEBNF(minilang)() assert parser syntax_tree = parser(snippet) assert not syntax_tree.collect_errors() assert snippet == str(syntax_tree) if WRITE_LOGS: syntax_tree.log("test_LeftRecursion_direct", '.cst') # self.minilang_parser1.log_parsing_history("test_LeftRecursion_direct") def test_indirect_left_recursion(self): pass def test_inifinite_loops(self): minilang = """not_forever = { // } \n""" snippet = " " parser = compileEBNF(minilang)() syntax_tree = parser(snippet) assert syntax_tree.error_flag # print(syntax_tree.collect_errors()) 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/ """ result, messages, syntax_tree = compile_source(mlregex, None, EBNFGrammar(), EBNFTransform, EBNFCompiler('MultilineRegexTest')) assert result assert not messages parser = compile_python_object(DHPARSER_IMPORTS + result, '\w+Grammar$')() node, rest = parser.regex('abc+def') assert rest == '' assert node.parser.name == "regex" assert str(node) == 'abc+def' def test_token(self): tokenlang = r""" @whitespace = linefeed lang = "" begin_token {/\w+/ ""} end_token begin_token = "\begin{document}" end_token = "\end{document}" """ testdoc = r""" \begin{document} test \end{document} """ result, messages, syntax_tree = compile_source(tokenlang, None, EBNFGrammar(), EBNFTransform, EBNFCompiler("TokenTest")) assert result assert not messages parser = compile_python_object(DHPARSER_IMPORTS + result, '\w+Grammar$')() result = parser(testdoc) # parser.log_parsing_history("test.log") assert not result.error_flag if __name__ == "__main__": from run import runner runner("TestInfiLoopsAndRecursion", globals())