test_parse.py 26.4 KB
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#!/usr/bin/python3

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"""test_parse.py - tests of the parsers-module of DHParser
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Author: Eckhart Arnold <arnold@badw.de>

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 sys
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from functools import partial
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sys.path.extend(['../', './'])
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from DHParser.toolkit import compile_python_object
from DHParser.log import logging, is_logging, log_ST
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from DHParser.error import Error
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from DHParser.parse import Retrieve, Grammar, Forward, TKN, ZeroOrMore, RE, \
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    RegExp, Lookbehind, NegativeLookahead, OneOrMore, Series, Alternative, AllOf, SomeOf, UnknownParserError
from DHParser import compile_source
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from DHParser.ebnf import get_ebnf_grammar, get_ebnf_transformer, get_ebnf_compiler
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from DHParser.dsl import grammar_provider, DHPARSER_IMPORTS
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class TestInfiLoopsAndRecursion:
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    def test_direct_left_recursion1(self):
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        minilang ="""
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            expr = expr ("+"|"-") term | term
            term = term ("*"|"/") factor | factor
            factor = /[0-9]+/~
            """
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        snippet = "9 + 8 + 7 + 6 + 5 + 3 * 4"
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        parser = grammar_provider(minilang)()
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        assert parser
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        syntax_tree = parser(snippet)
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        assert not syntax_tree.error_flag, str(syntax_tree.collect_errors())
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        assert snippet == str(syntax_tree)
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        if is_logging():
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            log_ST(syntax_tree, "test_LeftRecursion_direct.cst")
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            parser.log_parsing_history__("test_LeftRecursion_direct")
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    def test_direct_left_recursion2(self):
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        minilang = """
            expr = ex
            ex   = expr ("+"|"-") term | term
            term = term ("*"|"/") factor | factor
            factor = /[0-9]+/~
            """
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        snippet = "9 + 8 + 7 + 6 + 5 + 3 * 4"
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        parser = grammar_provider(minilang)()
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        assert parser
        syntax_tree = parser(snippet)
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        assert not syntax_tree.error_flag, syntax_tree.collect_errors()
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        assert snippet == str(syntax_tree)
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    def test_indirect_left_recursion1(self):
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        minilang = """
            Expr    = //~ (Product | Sum | Value)
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            Product = Expr { ('*' | '/') Expr }+
            Sum     = Expr { ('+' | '-') Expr }+
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            Value   = /[0-9.]+/~ | '(' Expr ')'
            """
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        parser = grammar_provider(minilang)()
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        assert parser
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        snippet = "8 * 4"
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        syntax_tree = parser(snippet)
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        assert not syntax_tree.error_flag, syntax_tree.collect_errors()
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        snippet = "7 + 8 * 4"
        syntax_tree = parser(snippet)
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        assert not syntax_tree.error_flag, syntax_tree.collect_errors()
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        snippet = "9 + 8 * (4 + 3)"
        syntax_tree = parser(snippet)
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        assert not syntax_tree.error_flag, syntax_tree.collect_errors()
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        assert snippet == str(syntax_tree)
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        if is_logging():
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            log_ST(syntax_tree, "test_LeftRecursion_indirect.cst")
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            parser.log_parsing_history__("test_LeftRecursion_indirect")
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    def test_inifinite_loops(self):
        minilang = """not_forever = { // } \n"""
        snippet = " "
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        parser = grammar_provider(minilang)()
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        syntax_tree = parser(snippet)
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        assert syntax_tree.error_flag

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class TestFlowControl:
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    def setup(self):
        self.t1 = """
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        All work and no play
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        makes Jack a dull boy
        END
        """
        self.t2 = "All word and not play makes Jack a dull boy END\n"

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    def test_lookbehind(self):
        ws = RegExp('\s*')
        end = RegExp("END")
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        doc_end = Lookbehind(RegExp('\\s*?\\n')) + end
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        word = RegExp('\w+')
        sequence = OneOrMore(NegativeLookahead(end) + word + ws)
        document = ws + sequence + doc_end + ws

        parser = Grammar(document)
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        cst = parser(self.t1)
        assert not cst.error_flag, cst.as_sxpr()
        cst = parser(self.t2)
        assert cst.error_flag, cst.as_sxpr()

    def test_lookbehind_indirect(self):
        class LookbehindTestGrammar(Grammar):
            parser_initialization__ = "upon instantiation"
            ws = RegExp('\\s*')
            end = RegExp('END')
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            SUCC_LB = RegExp('\\s*?\\n')
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            doc_end = Series(Lookbehind(SUCC_LB), end)
            word = RegExp('\w+')
            sequence = OneOrMore(Series(NegativeLookahead(end), word, ws))
            document = Series(ws, sequence, doc_end, ws)
            root__ = document

        parser = LookbehindTestGrammar()
        cst = parser(self.t1)
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        assert not cst.error_flag, cst.as_sxpr()
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        cst = parser(self.t2)
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        assert cst.error_flag, cst.as_sxpr()


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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/
        """
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        result, messages, syntax_tree = compile_source(mlregex, None, get_ebnf_grammar(),
                        get_ebnf_transformer(), get_ebnf_compiler('MultilineRegexTest'))
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        assert result
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        assert not messages, str(messages)
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        parser = compile_python_object(DHPARSER_IMPORTS + result, '\w+Grammar$')()
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        node = parser('abc+def', parser.regex)
        assert not node.error_flag
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        assert node.parser.name == "regex"
        assert str(node) == 'abc+def'

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    def test_multilineRegex_wo_Comments(self):
        mlregex = r"""
        regex =  /\w+ 
                  [+]  
                  \w* /
        """
        result, messages, syntax_tree = compile_source(mlregex, None, get_ebnf_grammar(),
                        get_ebnf_transformer(), get_ebnf_compiler('MultilineRegexTest'))
        assert result
        assert not messages, str(messages)
        parser = compile_python_object(DHPARSER_IMPORTS + result, '\w+Grammar$')()
        node = parser('abc+def', parser.regex)
        assert not node.error_flag
        assert node.parser.name == "regex"
        assert str(node) == 'abc+def'

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    def text_ignore_case(self):
        mlregex = r"""
        @ ignorecase = True
        regex = /alpha/
        """
        result, messages, syntax_tree = compile_source(mlregex, None, get_ebnf_grammar(),
                        get_ebnf_transformer(), get_ebnf_compiler('MultilineRegexTest'))
        assert result
        assert not messages
        parser = compile_python_object(DHPARSER_IMPORTS + result, '\w+Grammar$')()
        node, rest = parser.regex('Alpha')
        assert node
        assert not node.error_flag
        assert rest == ''
        assert node.parser.name == "regex"
        assert str(node) == 'Alpha'

        mlregex = r"""
        @ ignorecase = False
        regex = /alpha/
        """
        result, messages, syntax_tree = compile_source(mlregex, None, get_ebnf_grammar(),
                        get_ebnf_transformer(), get_ebnf_compiler('MultilineRegexTest'))
        assert result
        assert not messages
        parser = compile_python_object(DHPARSER_IMPORTS + result, '\w+Grammar$')()
        node, rest = parser.regex('Alpha')
        assert node.error_flag


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    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}
            """
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        result, messages, syntax_tree = compile_source(tokenlang, None, get_ebnf_grammar(),
                                    get_ebnf_transformer(), get_ebnf_compiler("TokenTest"))
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        assert result
        assert not messages
        parser = compile_python_object(DHPARSER_IMPORTS + result, '\w+Grammar$')()
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        result = parser(testdoc)
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        # parser.log_parsing_history("test.log")
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        assert not result.error_flag

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class TestGrammar:
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    def setup(self):
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        grammar = r"""@whitespace = horizontal
        haupt        = textzeile LEERZEILE
        textzeile    = { WORT }+
        WORT         = /[^ \t]+/~
        LEERZEILE    = /\n[ \t]*(?=\n)/~
        """
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        self.pyparser, messages, syntax_tree = compile_source(grammar, None, get_ebnf_grammar(),
                                                              get_ebnf_transformer(), get_ebnf_compiler("PosTest"))
        assert self.pyparser
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        assert not messages
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    def test_pos_values_initialized(self):
        # checks whether pos values in the parsing result and in the
        # history record have been initialized
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        with logging("LOGS"):
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            grammar = compile_python_object(DHPARSER_IMPORTS + self.pyparser, '\w+Grammar$')()
            grammar("no_file_name*")
        for record in grammar.history__:
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            assert not record.node or record.node.pos >= 0

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    def test_select_parsing(self):
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        grammar = compile_python_object(DHPARSER_IMPORTS + self.pyparser, '\w+Grammar$')()
        grammar("wort", "WORT")
        grammar("eine Zeile", "textzeile")
        grammar("kein Haupt", "haupt")
        grammar("so ist es richtig", "haupt")
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    def test_grammar_subclassing(self):
        class Arithmetic(Grammar):
            '''
            expression =  term  { ("+" | "-") term }
            term       =  factor  { ("*" | "/") factor }
            factor     =  INTEGER | "("  expression  ")"
            INTEGER    =  /\d+/~
            '''
            expression = Forward()
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            INTEGER = RE('\\d+')
            factor = INTEGER | TKN("(") + expression + TKN(")")
            term = factor + ZeroOrMore((TKN("*") | TKN("/")) + factor)
            expression.set(term + ZeroOrMore((TKN("+") | TKN("-")) + term))
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            root__ = expression

        grammar = Arithmetic()
        CST = grammar('3+4')
        assert not CST.error_flag, CST.as_sxpr()

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class TestSeries:
    def test_non_mandatory(self):
        lang = """
        document = series | /.*/
        series = "A" "B" "C" "D"
        """
        parser = grammar_provider(lang)()
        st = parser("ABCD");
        assert not st.error_flag
        st = parser("A_CD");
        assert not st.error_flag
        st = parser("AB_D");
        assert not st.error_flag

    def test_mandatory(self):
        """Test for the §-operator. The Series-parser should raise an
        error for any non-match that occurs after the mandatory-operator.
        """
        lang = """
        document = series | /.*/
        series = "A" "B" §"C" "D"
        """
        parser = grammar_provider(lang)()
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        st = parser("ABCD");  assert not st.error_flag
        st = parser("A_CD");  assert not st.error_flag
        st = parser("AB_D");  assert st.error_flag
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        # print(st.collect_errors())
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        assert st.collect_errors()[0].code == Error.MANDATORY_CONTINUATION
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        # transitivity of mandatory-operator
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        st = parser("ABC_");  assert st.error_flag
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        assert st.collect_errors()[0].code == Error.MANDATORY_CONTINUATION

    def test_series_composition(self):
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        TA, TB, TC, TD, TE = (TKN(b) for b in "ABCDE")
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        s1 = Series(TA, TB, TC, mandatory=2)
        s2 = Series(TD, TE)

        combined = Alternative(s1 + s2, RegExp('.*'))
        parser = Grammar(combined)
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        st = parser("ABCDE");  assert not st.error_flag
        st = parser("A_CDE");  assert not st.error_flag
        st = parser("AB_DE");  assert st.error_flag
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        assert st.collect_errors()[0].code == Error.MANDATORY_CONTINUATION
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        st = parser("ABC_E");  assert st.error_flag
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        assert st.collect_errors()[0].code == Error.MANDATORY_CONTINUATION

        combined = Alternative(s2 + s1, RegExp('.*'))
        parser = Grammar(combined)
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        st = parser("DEABC");  assert not st.error_flag
        st = parser("_EABC");  assert not st.error_flag
        st = parser("D_ABC");  assert not st.error_flag
        st = parser("DE_BC");  assert not st.error_flag
        st = parser("DEA_C");  assert not st.error_flag
        st = parser("DEAB_");  assert st.error_flag
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        assert st.collect_errors()[0].code == Error.MANDATORY_CONTINUATION

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    # def test_boundary_cases(self):
    #     lang = """
    #     document = series | §!single | /.*/
    #     series = "A" "B" §"C" "D"
    #     single = "E"
    #     """
    #     parser_class = grammar_provider(lang)
    #     parser = parser_class()
    #     print(parser.python_src__)
    #     print(parser_class.python_src__)
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class TestAllOfSomeOf:
    def test_allOf_order(self):
        """Test that parsers of an AllOf-List can match in arbitrary order."""
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        prefixes = AllOf(TKN("A"), TKN("B"))
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        assert Grammar(prefixes)('A B').content == 'A B'
        assert Grammar(prefixes)('B A').content == 'B A'
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        # aternative Form
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        prefixes = AllOf(Series(TKN("B"), TKN("A")))
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        assert Grammar(prefixes)('A B').content == 'A B'
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    def test_allOf_completeness(self):
        """Test that an error is raised if not  all parsers of an AllOf-List
        match."""
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        prefixes = AllOf(TKN("A"), TKN("B"))
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        assert Grammar(prefixes)('B').error_flag

    def test_allOf_redundance(self):
        """Test that one and the same parser may be listed several times
        and must be matched several times accordingly."""
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        prefixes = AllOf(TKN("A"), TKN("B"), TKN("A"))
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        assert Grammar(prefixes)('A A B').content == 'A A B'
        assert Grammar(prefixes)('A B A').content == 'A B A'
        assert Grammar(prefixes)('B A A').content == 'B A A'
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        assert Grammar(prefixes)('A B B').error_flag

    def test_someOf_order(self):
        """Test that parsers of an AllOf-List can match in arbitrary order."""
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        prefixes = SomeOf(TKN("A"), TKN("B"))
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        assert Grammar(prefixes)('A B').content == 'A B'
        assert Grammar(prefixes)('B A').content == 'B A'
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        # aternative Form
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        prefixes = SomeOf(Alternative(TKN("B"), TKN("A")))
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        assert Grammar(prefixes)('A B').content == 'A B'
        assert Grammar(prefixes)('B').content == 'B'
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    def test_someOf_redundance(self):
        """Test that one and the same parser may be listed several times
        and must be matched several times accordingly."""
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        prefixes = SomeOf(TKN("A"), TKN("B"), TKN("A"))
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        assert Grammar(prefixes)('A A B').content == 'A A B'
        assert Grammar(prefixes)('A B A').content == 'A B A'
        assert Grammar(prefixes)('B A A').content == 'B A A'
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        assert Grammar(prefixes)('A B B').error_flag


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class TestPopRetrieve:
    mini_language = """
        document       = { text | codeblock }
        codeblock      = delimiter { text | (!:delimiter delimiter_sign) } ::delimiter
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        delimiter      = delimiter_sign  # never use delimiter between capture and pop except for retrival!
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        delimiter_sign = /`+/
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        text           = /[^`]+/
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        """
    mini_lang2 = """
        @braces_filter=counterpart
        document       = { text | codeblock }
        codeblock      = braces { text | opening_braces | (!:braces closing_braces) } ::braces
        braces         = opening_braces
        opening_braces = /\{+/
        closing_braces = /\}+/
        text           = /[^{}]+/
        """
    mini_lang3 = """
        document       = { text | env }
        env            = (specialtag | opentag) text [closespecial | closetag]
        opentag        = "<" name ">"
        specialtag     = "<" /ABC/ !name ">"
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        closetag       = close_slash | close_star
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        close_slash    = "<" ::name "/>"
        close_star     = "<" ::name "*>"
        closespecial   = "<" /ABC/~ ">"
        name           = /\w+/~
        text           = /[^<>]+/
        """

    def setup(self):
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        self.minilang_parser = grammar_provider(self.mini_language)()
        self.minilang_parser2 = grammar_provider(self.mini_lang2)()
        self.minilang_parser3 = grammar_provider(self.mini_lang3)()
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    @staticmethod
    def opening_delimiter(node, name):
        return node.tag_name == name and not isinstance(node.parser, Retrieve)

    @staticmethod
    def closing_delimiter(node):
        return isinstance(node.parser, Retrieve)

    def test_compile_mini_language(self):
        assert self.minilang_parser
        assert self.minilang_parser2
        assert self.minilang_parser3

    def test_stackhandling(self):
        ambigous_opening = "<ABCnormal> normal tag <ABCnormal*>"
        syntax_tree = self.minilang_parser3(ambigous_opening)
        assert not syntax_tree.error_flag, str(syntax_tree.collect_errors())

        ambigous_opening = "<ABCnormal> normal tag <ABCnormal/>"
        syntax_tree = self.minilang_parser3(ambigous_opening)
        assert not syntax_tree.error_flag, str(syntax_tree.collect_errors())

        forgot_closing_tag = "<em> where is the closing tag?"
        syntax_tree = self.minilang_parser3(forgot_closing_tag)
        assert syntax_tree.error_flag, str(syntax_tree.collect_errors())

        proper = "<em> has closing tag <em/>"
        syntax_tree = self.minilang_parser3(proper)
        assert not syntax_tree.error_flag, str(syntax_tree.collect_errors())

        proper = "<em> has closing tag <em*>"
        syntax_tree = self.minilang_parser3(proper)
        assert not syntax_tree.error_flag, str(syntax_tree.collect_errors())

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    def test_cache_neutrality(self):
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        """Test that packrat-caching does not interfere with the variable-
        changing parsers: Capture and Retrieve."""
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        lang = """
            text = opening closing
            opening = (unmarked_package | marked_package)
            closing = ::variable
            unmarked_package = package "."
            marked_package = package "*" "."
            package = "(" variable ")"
            variable = /\w+/~
            """
        case = "(secret)*. secret"
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        gr = grammar_provider(lang)()
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        st = gr(case)
        assert not st.error_flag, str(st.collect_errors())
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    def test_single_line(self):
        teststr = "Anfang ```code block `` <- keine Ende-Zeichen ! ``` Ende"
        syntax_tree = self.minilang_parser(teststr)
        assert not syntax_tree.collect_errors()
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        delim = str(next(syntax_tree.select(partial(self.opening_delimiter, name="delimiter"))))
        pop = str(next(syntax_tree.select(self.closing_delimiter)))
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        assert delim == pop
        if is_logging():
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            log_ST(syntax_tree, "test_PopRetrieve_single_line.cst")
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    def test_multi_line(self):
        teststr = """
            Anfang ```code block `` <- keine Ende-Zeichen ! ``` Ebde

            Absatz ohne ``` codeblock, aber
            das stellt sich erst am Ende herause...

            Mehrzeliger ```code block
            """
        syntax_tree = self.minilang_parser(teststr)
        assert not syntax_tree.collect_errors()
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        delim = str(next(syntax_tree.select(partial(self.opening_delimiter, name="delimiter"))))
        pop = str(next(syntax_tree.select(self.closing_delimiter)))
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        assert delim == pop
        if is_logging():
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            log_ST(syntax_tree, "test_PopRetrieve_multi_line.cst")
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    def test_single_line_complement(self):
        teststr = "Anfang {{{code block }} <- keine Ende-Zeichen ! }}} Ende"
        syntax_tree = self.minilang_parser2(teststr)
        assert not syntax_tree.collect_errors()
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        delim = str(next(syntax_tree.select(partial(self.opening_delimiter, name="braces"))))
        pop = str(next(syntax_tree.select(self.closing_delimiter)))
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        assert len(delim) == len(pop) and delim != pop
        if is_logging():
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            log_ST(syntax_tree, "test_PopRetrieve_single_line.cst")
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    def test_multi_line_complement(self):
        teststr = """
            Anfang {{{code block {{ <- keine Ende-Zeichen ! }}} Ende

            Absatz ohne {{{ codeblock, aber
            das stellt sich erst am Ende heraus...

            Mehrzeliger }}}code block
            """
        syntax_tree = self.minilang_parser2(teststr)
        assert not syntax_tree.collect_errors()
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        delim = str(next(syntax_tree.select(partial(self.opening_delimiter, name="braces"))))
        pop = str(next(syntax_tree.select(self.closing_delimiter)))
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        assert len(delim) == len(pop) and delim != pop
        if is_logging():
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            log_ST(syntax_tree, "test_PopRetrieve_multi_line.cst")
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class TestWhitespaceHandling:
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    minilang = """
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        doc = A B
        A = "A"
        B = "B"
        Rdoc = ar br
        ar = /A/
        br = /B/
        """

    def setup(self):
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        self.gr = grammar_provider(self.minilang)()
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    def test_token_whitespace(self):
        st = self.gr("AB", 'doc')
        assert not st.error_flag
        st = self.gr("A B", 'doc')
        assert not st.error_flag

    def test_regexp_whitespace(self):
        st = self.gr("AB", 'Rdoc')
        assert not st.error_flag
        st = self.gr("A B", 'Rdoc')
        assert st.error_flag
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class TestErrorReporting:
    grammar = """
        root      = series alpha | anything
        series    = subseries &alpha 
        subseries = alpha §beta
        alpha     = /[a-z]+/
        beta      = /[A-Z]+/
        anything  = /.*/
        """

    def setup(self):
        self.parser = grammar_provider(self.grammar)()

    def test_error_propagation(self):
        testcode1 = "halloB"
        testcode2 = "XYZ"
        testcode3 = "hallo "
        cst = self.parser(testcode1)
        assert not cst.error_flag, str(cst.collect_errors())
        cst = self.parser(testcode2)
        assert not cst.error_flag
        cst = self.parser(testcode3)
        assert cst.error_flag
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class TestBorderlineCases:
    def test_not_matching(self):
        minilang = """parser = /X/"""
        gr = grammar_provider(minilang)()
        cst = gr('X', 'parser')
        assert not cst.error_flag
        cst = gr(' ', 'parser')
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        assert cst.error_flag and cst.collect_errors()[0].code == Error.PARSER_DID_NOT_MATCH
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        cst = gr('', 'parser')
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        assert cst.error_flag and cst.collect_errors()[0].code == Error.PARSER_DID_NOT_MATCH
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    def test_matching(self):
        minilang = """parser = /.?/"""
        gr = grammar_provider(minilang)()
        cst = gr(' ', 'parser')
        assert not cst.error_flag
        cst = gr('  ', 'parser')
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        assert cst.error_flag and cst.collect_errors()[0].code == Error.PARSER_STOPPED_BEFORE_END
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        cst = gr('', 'parser')
        assert not cst.error_flag


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class TestReentryAfterError:
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    def setup(self):
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        lang = """
        document = alpha [beta] gamma "."
          alpha = "ALPHA" abc
            abc = §"a" "b" "c"
          beta = "BETA" (bac | bca)
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            bac = "b" "a" §"c"
            bca = "b" "c" §"a"
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          gamma = "GAMMA" §(cab | cba)
            cab = "c" "a" §"b"
            cba = "c" "b" §"a"
        """
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        self.gr = grammar_provider(lang)()
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    def test_no_resume_rules(self):
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        # 1. no resume rules
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        gr = self.gr;  gr.resume_rules = dict()
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        content = 'ALPHA acb BETA bac GAMMA cab .'
        cst = gr(content)
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        # print(cst.as_sxpr())
        assert cst.error_flag
        assert cst.content == content
        assert cst.pick('alpha').content.startswith('ALPHA')

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    def test_simple_resume_rule(self):
        gr = self.gr;  gr.resume_rules = dict()
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        gr.resume_rules__['alpha'] = ['BETA']
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        content = 'ALPHA acb BETA bac GAMMA cab .'
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        cst = gr(content)
        # print(cst.as_sxpr())
        assert cst.error_flag
        assert cst.content == content
        assert cst.pick('alpha').content.startswith('ALPHA')
        # because of resuming, there should be only on error message
        assert len(cst.collect_errors()) == 1

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    def test_failing_resume_rule(self):
        gr = self.gr;  gr.resume_rules = dict()
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        gr.resume_rules__['alpha'] = ['XXX']
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        content = 'ALPHA acb BETA bac GAMMA cab .'
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        cst = gr(content)
        # print(cst.as_sxpr())
        assert cst.error_flag
        assert cst.content == content
        # assert cst.pick('alpha').content.startswith('ALPHA')
        # because of resuming, there should be only on error message

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    def test_severl_reentry_points(self):
        gr = self.gr;  gr.resume_rules = dict()
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        gr.resume_rules__['alpha'] = ['BETA', 'GAMMA']
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        content = 'ALPHA acb BETA bac GAMMA cab .'
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        cst = gr(content)
        # print(cst.as_sxpr())
        assert cst.error_flag
        assert cst.content == content
        assert cst.pick('alpha').content.startswith('ALPHA')
        # because of resuming, there should be only on error message
        assert len(cst.collect_errors()) == 1

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    def test_several_reentry_points_second_point_matching(self):
        gr = self.gr;  gr.resume_rules = dict()
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        gr.resume_rules__['alpha'] = ['BETA', 'GAMMA']
        content = 'ALPHA acb GAMMA cab .'
        cst = gr(content)
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        # print(cst.as_sxpr())
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        assert cst.error_flag
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        assert cst.content == content
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        assert cst.pick('alpha').content.startswith('ALPHA')
        # because of resuming, there should be only on error message
        assert len(cst.collect_errors()) == 1
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    def test_several_resume_rules_innermost_rule_matching(self):
        gr = self.gr;  gr.resume_rules = dict()
        gr.resume_rules__['alpha'] = ['BETA', 'GAMMA']
        gr.resume_rules__['beta'] = ['GAMMA']
        gr.resume_rules__['bac'] = ['GAMMA']
        content = 'ALPHA abc BETA bad GAMMA cab .'
        cst = gr(content)
        # print(cst.as_sxpr())
        assert cst.error_flag
        assert cst.content == content
        assert cst.pick('alpha').content.startswith('ALPHA')
        # because of resuming, there should be only on error message
        assert len(cst.collect_errors()) == 1
        # multiple failures
        content = 'ALPHA acb BETA bad GAMMA cab .'
        cst = gr(content)
        # print(cst.as_sxpr())
        assert cst.error_flag
        assert cst.content == content
        assert cst.pick('alpha').content.startswith('ALPHA')
        # because of resuming, there should be only on error message
        assert len(cst.collect_errors()) == 2

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class TestUnknownParserError:
    def test_unknown_parser_error(self):
        gr = Grammar()
        try:
            gr("", "NonExistantParser")
            assert False, "UnknownParserError expected!"
        except UnknownParserError:
            pass


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if __name__ == "__main__":
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    from DHParser.testing import runner
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    with logging(False):
        runner("", globals())