test_parse.py 22.6 KB
Newer Older
1
2
#!/usr/bin/python3

3
"""test_parse.py - tests of the parsers-module of DHParser
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

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
23
from functools import partial
24

Eckhart Arnold's avatar
Eckhart Arnold committed
25
sys.path.extend(['../', './'])
26

27
28
from DHParser.toolkit import compile_python_object
from DHParser.log import logging, is_logging, log_ST
29
from DHParser.error import Error
30
from DHParser.parse import Retrieve, Grammar, Forward, _Token, ZeroOrMore, _RE, \
31
32
    RegExp, Lookbehind, NegativeLookahead, OneOrMore, Series, Alternative, AllOf, SomeOf, UnknownParserError
from DHParser import compile_source
Eckhart Arnold's avatar
Eckhart Arnold committed
33
from DHParser.ebnf import get_ebnf_grammar, get_ebnf_transformer, get_ebnf_compiler
34
from DHParser.dsl import grammar_provider, DHPARSER_IMPORTS
35
36


37
class TestInfiLoopsAndRecursion:
38
    def test_direct_left_recursion1(self):
eckhart's avatar
eckhart committed
39
        minilang ="""
40
41
42
43
            expr = expr ("+"|"-") term | term
            term = term ("*"|"/") factor | factor
            factor = /[0-9]+/~
            """
44
        snippet = "9 + 8 + 7 + 6 + 5 + 3 * 4"
45
        parser = grammar_provider(minilang)()
46
        assert parser
Eckhart Arnold's avatar
Eckhart Arnold committed
47
        syntax_tree = parser(snippet)
48
        assert not syntax_tree.error_flag, str(syntax_tree.collect_errors())
49
        assert snippet == str(syntax_tree)
Eckhart Arnold's avatar
Eckhart Arnold committed
50
        if is_logging():
51
            log_ST(syntax_tree, "test_LeftRecursion_direct.cst")
52
            parser.log_parsing_history__("test_LeftRecursion_direct")
53

54
    def test_direct_left_recursion2(self):
55
56
57
58
59
60
        minilang = """
            expr = ex
            ex   = expr ("+"|"-") term | term
            term = term ("*"|"/") factor | factor
            factor = /[0-9]+/~
            """
61
        snippet = "9 + 8 + 7 + 6 + 5 + 3 * 4"
62
        parser = grammar_provider(minilang)()
63
64
        assert parser
        syntax_tree = parser(snippet)
65
        assert not syntax_tree.error_flag, syntax_tree.collect_errors()
66
        assert snippet == str(syntax_tree)
67

68
    def test_indirect_left_recursion1(self):
69
70
        minilang = """
            Expr    = //~ (Product | Sum | Value)
71
72
            Product = Expr { ('*' | '/') Expr }+
            Sum     = Expr { ('+' | '-') Expr }+
73
74
            Value   = /[0-9.]+/~ | '(' Expr ')'
            """
75
        parser = grammar_provider(minilang)()
76
        assert parser
77
        snippet = "8 * 4"
78
        syntax_tree = parser(snippet)
79
        assert not syntax_tree.error_flag, syntax_tree.collect_errors()
80
81
        snippet = "7 + 8 * 4"
        syntax_tree = parser(snippet)
82
        assert not syntax_tree.error_flag, syntax_tree.collect_errors()
83
84
        snippet = "9 + 8 * (4 + 3)"
        syntax_tree = parser(snippet)
85
        assert not syntax_tree.error_flag, syntax_tree.collect_errors()
86
        assert snippet == str(syntax_tree)
87
        if is_logging():
88
            log_ST(syntax_tree, "test_LeftRecursion_indirect.cst")
89
            parser.log_parsing_history__("test_LeftRecursion_indirect")
90

91
92
93
    def test_inifinite_loops(self):
        minilang = """not_forever = { // } \n"""
        snippet = " "
94
        parser = grammar_provider(minilang)()
Eckhart Arnold's avatar
Eckhart Arnold committed
95
        syntax_tree = parser(snippet)
96
97
        assert syntax_tree.error_flag

98

Eckhart Arnold's avatar
Eckhart Arnold committed
99
class TestFlowControl:
100
101
    def setup(self):
        self.t1 = """
eckhart's avatar
eckhart committed
102
        All work and no play
103
104
105
106
107
        makes Jack a dull boy
        END
        """
        self.t2 = "All word and not play makes Jack a dull boy END\n"

Eckhart Arnold's avatar
Eckhart Arnold committed
108
109
110
    def test_lookbehind(self):
        ws = RegExp('\s*')
        end = RegExp("END")
111
        doc_end = Lookbehind(RegExp('\\s*?\\n')) + end
Eckhart Arnold's avatar
Eckhart Arnold committed
112
113
114
115
116
        word = RegExp('\w+')
        sequence = OneOrMore(NegativeLookahead(end) + word + ws)
        document = ws + sequence + doc_end + ws

        parser = Grammar(document)
117
118
119
120
121
122
123
124
125
126
        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')
127
            SUCC_LB = RegExp('\\s*?\\n')
128
129
130
131
132
133
134
135
            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)
Eckhart Arnold's avatar
Eckhart Arnold committed
136
        assert not cst.error_flag, cst.as_sxpr()
137
        cst = parser(self.t2)
Eckhart Arnold's avatar
Eckhart Arnold committed
138
139
140
        assert cst.error_flag, cst.as_sxpr()


141
142
143
144
145
146
147
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's avatar
Eckhart Arnold committed
148
149
        result, messages, syntax_tree = compile_source(mlregex, None, get_ebnf_grammar(),
                        get_ebnf_transformer(), get_ebnf_compiler('MultilineRegexTest'))
150
        assert result
151
        assert not messages, str(messages)
152
        parser = compile_python_object(DHPARSER_IMPORTS + result, '\w+Grammar$')()
eckhart's avatar
eckhart committed
153
154
        node = parser('abc+def', parser.regex)
        assert not node.error_flag
155
156
157
        assert node.parser.name == "regex"
        assert str(node) == 'abc+def'

158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
    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'

174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
    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


204
205
206
207
208
209
210
211
212
213
214
215
    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's avatar
Eckhart Arnold committed
216
217
        result, messages, syntax_tree = compile_source(tokenlang, None, get_ebnf_grammar(),
                                    get_ebnf_transformer(), get_ebnf_compiler("TokenTest"))
218
219
220
        assert result
        assert not messages
        parser = compile_python_object(DHPARSER_IMPORTS + result, '\w+Grammar$')()
Eckhart Arnold's avatar
Eckhart Arnold committed
221
        result = parser(testdoc)
222
        # parser.log_parsing_history("test.log")
223
224
        assert not result.error_flag

225

226
class TestGrammar:
227
    def setup(self):
228
229
230
231
232
233
        grammar = r"""@whitespace = horizontal
        haupt        = textzeile LEERZEILE
        textzeile    = { WORT }+
        WORT         = /[^ \t]+/~
        LEERZEILE    = /\n[ \t]*(?=\n)/~
        """
234
235
236
        self.pyparser, messages, syntax_tree = compile_source(grammar, None, get_ebnf_grammar(),
                                                              get_ebnf_transformer(), get_ebnf_compiler("PosTest"))
        assert self.pyparser
237
        assert not messages
238
239
240
241

    def test_pos_values_initialized(self):
        # checks whether pos values in the parsing result and in the
        # history record have been initialized
242
        with logging("LOGS"):
243
244
245
            grammar = compile_python_object(DHPARSER_IMPORTS + self.pyparser, '\w+Grammar$')()
            grammar("no_file_name*")
        for record in grammar.history__:
246
247
            assert not record.node or record.node.pos >= 0

248
    def test_select_parsing(self):
249
250
251
252
253
        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")
254

di68kap's avatar
di68kap committed
255
256
257
258
259
260
261
262
263
    def test_grammar_subclassing(self):
        class Arithmetic(Grammar):
            '''
            expression =  term  { ("+" | "-") term }
            term       =  factor  { ("*" | "/") factor }
            factor     =  INTEGER | "("  expression  ")"
            INTEGER    =  /\d+/~
            '''
            expression = Forward()
264
265
266
267
            INTEGER = _RE('\\d+')
            factor = INTEGER | _Token("(") + expression + _Token(")")
            term = factor + ZeroOrMore((_Token("*") | _Token("/")) + factor)
            expression.set(term + ZeroOrMore((_Token("+") | _Token("-")) + term))
di68kap's avatar
di68kap committed
268
269
270
271
272
273
            root__ = expression

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

274

275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
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)()
298
299
300
        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
301
        assert st.collect_errors()[0].code == Error.MANDATORY_CONTINUATION
302
        # transitivity of mandatory-operator
303
        st = parser("ABC_");  assert st.error_flag
304
305
306
        assert st.collect_errors()[0].code == Error.MANDATORY_CONTINUATION

    def test_series_composition(self):
307
        TA, TB, TC, TD, TE = (_Token(b) for b in "ABCDE")
308
309
310
311
312
        s1 = Series(TA, TB, TC, mandatory=2)
        s2 = Series(TD, TE)

        combined = Alternative(s1 + s2, RegExp('.*'))
        parser = Grammar(combined)
313
314
315
        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
316
        assert st.collect_errors()[0].code == Error.MANDATORY_CONTINUATION
317
        st = parser("ABC_E");  assert st.error_flag
318
319
320
321
        assert st.collect_errors()[0].code == Error.MANDATORY_CONTINUATION

        combined = Alternative(s2 + s1, RegExp('.*'))
        parser = Grammar(combined)
322
323
324
325
326
327
        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
328
329
        assert st.collect_errors()[0].code == Error.MANDATORY_CONTINUATION

eckhart's avatar
eckhart committed
330
331
332
333
334
335
336
337
338
339
    # 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__)
eckhart's avatar
eckhart committed
340

341

342
343
344
class TestAllOfSomeOf:
    def test_allOf_order(self):
        """Test that parsers of an AllOf-List can match in arbitrary order."""
345
        prefixes = AllOf(_Token("A"), _Token("B"))
346
347
        assert Grammar(prefixes)('A B').content == 'A B'
        assert Grammar(prefixes)('B A').content == 'B A'
348
        # aternative Form
349
        prefixes = AllOf(Series(_Token("B"), _Token("A")))
350
        assert Grammar(prefixes)('A B').content == 'A B'
351
352
353
354

    def test_allOf_completeness(self):
        """Test that an error is raised if not  all parsers of an AllOf-List
        match."""
355
        prefixes = AllOf(_Token("A"), _Token("B"))
356
357
358
359
360
        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."""
361
        prefixes = AllOf(_Token("A"), _Token("B"), _Token("A"))
362
363
364
        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'
365
366
367
368
        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."""
369
        prefixes = SomeOf(_Token("A"), _Token("B"))
370
371
        assert Grammar(prefixes)('A B').content == 'A B'
        assert Grammar(prefixes)('B A').content == 'B A'
372
        # aternative Form
373
        prefixes = SomeOf(Alternative(_Token("B"), _Token("A")))
374
375
        assert Grammar(prefixes)('A B').content == 'A B'
        assert Grammar(prefixes)('B').content == 'B'
376
377
378
379

    def test_someOf_redundance(self):
        """Test that one and the same parser may be listed several times
        and must be matched several times accordingly."""
380
        prefixes = SomeOf(_Token("A"), _Token("B"), _Token("A"))
381
382
383
        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'
384
385
386
        assert Grammar(prefixes)('A B B').error_flag


387
388
389
390
class TestPopRetrieve:
    mini_language = """
        document       = { text | codeblock }
        codeblock      = delimiter { text | (!:delimiter delimiter_sign) } ::delimiter
391
        delimiter      = delimiter_sign  # never use delimiter between capture and pop except for retrival!
392
        delimiter_sign = /`+/
eckhart's avatar
eckhart committed
393
        text           = /[^`]+/
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
        """
    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 ">"
eckhart's avatar
eckhart committed
409
        closetag       = close_slash | close_star
410
411
412
413
414
415
416
417
        close_slash    = "<" ::name "/>"
        close_star     = "<" ::name "*>"
        closespecial   = "<" /ABC/~ ">"
        name           = /\w+/~
        text           = /[^<>]+/
        """

    def setup(self):
418
419
420
        self.minilang_parser = grammar_provider(self.mini_language)()
        self.minilang_parser2 = grammar_provider(self.mini_lang2)()
        self.minilang_parser3 = grammar_provider(self.mini_lang3)()
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455

    @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())

456
    def test_cache_neutrality(self):
457
458
        """Test that packrat-caching does not interfere with the variable-
        changing parsers: Capture and Retrieve."""
459
460
461
462
463
464
465
466
467
468
        lang = """
            text = opening closing
            opening = (unmarked_package | marked_package)
            closing = ::variable
            unmarked_package = package "."
            marked_package = package "*" "."
            package = "(" variable ")"
            variable = /\w+/~
            """
        case = "(secret)*. secret"
469
        gr = grammar_provider(lang)()
470
471
        st = gr(case)
        assert not st.error_flag, str(st.collect_errors())
472
473
474
475
476

    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()
477
478
        delim = str(next(syntax_tree.select(partial(self.opening_delimiter, name="delimiter"))))
        pop = str(next(syntax_tree.select(self.closing_delimiter)))
479
480
        assert delim == pop
        if is_logging():
481
            log_ST(syntax_tree, "test_PopRetrieve_single_line.cst")
482
483
484
485
486
487
488
489
490
491
492
493

    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()
494
495
        delim = str(next(syntax_tree.select(partial(self.opening_delimiter, name="delimiter"))))
        pop = str(next(syntax_tree.select(self.closing_delimiter)))
496
497
        assert delim == pop
        if is_logging():
498
            log_ST(syntax_tree, "test_PopRetrieve_multi_line.cst")
499
500
501
502
503

    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()
504
505
        delim = str(next(syntax_tree.select(partial(self.opening_delimiter, name="braces"))))
        pop = str(next(syntax_tree.select(self.closing_delimiter)))
506
507
        assert len(delim) == len(pop) and delim != pop
        if is_logging():
508
            log_ST(syntax_tree, "test_PopRetrieve_single_line.cst")
509
510
511
512
513
514
515
516
517
518
519
520

    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()
521
522
        delim = str(next(syntax_tree.select(partial(self.opening_delimiter, name="braces"))))
        pop = str(next(syntax_tree.select(self.closing_delimiter)))
523
524
        assert len(delim) == len(pop) and delim != pop
        if is_logging():
525
            log_ST(syntax_tree, "test_PopRetrieve_multi_line.cst")
526
527


528
class TestWhitespaceHandling:
Eckhart Arnold's avatar
Eckhart Arnold committed
529
    minilang = """
530
531
532
533
534
535
536
537
538
        doc = A B
        A = "A"
        B = "B"
        Rdoc = ar br
        ar = /A/
        br = /B/
        """

    def setup(self):
539
        self.gr = grammar_provider(self.minilang)()
540
541
542
543
544
545
546
547
548
549
550
551

    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
di68kap's avatar
di68kap committed
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576


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
577
578


di68kap's avatar
di68kap committed
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
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')
        assert cst.error_flag
        cst = gr('', 'parser')
        assert cst.error_flag

    def test_matching(self):
        minilang = """parser = /.?/"""
        gr = grammar_provider(minilang)()
        cst = gr(' ', 'parser')
        assert not cst.error_flag
        cst = gr('  ', 'parser')
        assert cst.error_flag
        cst = gr('', 'parser')
        assert not cst.error_flag


601
602
603
604
605
606
607
608
609
610
class TestUnknownParserError:
    def test_unknown_parser_error(self):
        gr = Grammar()
        try:
            gr("", "NonExistantParser")
            assert False, "UnknownParserError expected!"
        except UnknownParserError:
            pass


611
if __name__ == "__main__":
612
    from DHParser.testing import runner
613
614
    with logging(False):
        runner("", globals())