testing.py 14.7 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
"""testing.py - test support for DHParser based grammars and compilers

Copyright 2016  by Eckhart Arnold (arnold@badw.de)
                Bavarian Academy of Sciences an Humanities (badw.de)

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.
"""
18
import collections
19
import configparser
20
import copy
di68kap's avatar
di68kap committed
21
import inspect
22
23
import json
import os
24
25
26
27
try:
    import regex as re
except ImportError:
    import re
28
29

from DHParser import Node, error_messages
30
from DHParser.toolkit import compact_sexpr, is_logging
31
32
from DHParser.syntaxtree import MockParser
from DHParser.ebnf import grammar_changed
33
from DHParser.dsl import compile_on_disk
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51


def mock_syntax_tree(sexpr):
    """Generates a tree of nodes from an S-expression.

    Example: 
    >>> mock_syntax_tree("(a (b c))").as_sexpr()
    (a 
        (b 
            "c" 
        )
    )
    """
    def next_block(s):
        s = s.strip()
        while s[0] != ')':
            if s[0] != '(': raise ValueError('"(" expected, not ' + s[:10])
            # assert s[0] == '(', s
52
            level = 1
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
            i = 1
            while level > 0:
                if s[i] == '(':
                    level += 1
                elif s[i] == ')':
                    level -= 1
                i += 1
            yield s[:i]
            s = s[i:].strip()

    sexpr = sexpr.strip()
    if sexpr[0] != '(': raise ValueError('"(" expected, not ' + sexpr[:10])
    # assert sexpr[0] == '(', sexpr
    sexpr = sexpr[1:].strip()
    m = re.match('[\w:]+', sexpr)
    name, class_name = (sexpr[:m.end()].split(':') + [''])[:2]
    sexpr = sexpr[m.end():].strip()
    if sexpr[0] == '(':
        result = tuple(mock_syntax_tree(block) for block in next_block(sexpr))
    else:
        lines = []
        while sexpr and sexpr[0] != ')':
            for qm in ['"""', "'''", '"', "'"]:
                m = re.match(qm + r'.*?' + qm, sexpr)
                if m:
                    i = len(qm)
                    lines.append(sexpr[i:m.end() - i])
                    sexpr = sexpr[m.end():].strip()
                    break
            else:
                m = re.match(r'(?:(?!\)).)*', sexpr)
                lines.append(sexpr[:m.end()])
                sexpr = sexpr[m.end():]
        result = "\n".join(lines)
    return Node(MockParser(name, ':' + class_name), result)


90
def recompile_grammar(ebnf_filename, force=False) -> bool:
91
    """Recompiles an ebnf-grammar if necessary, that is if either no
92
    corresponding 'XXXXCompiler.py'-file exists or if that file is
93
94
95
96
97
98
99
    outdated.
    
    Parameters:
        ebnf_filename(str):  The filename of the ebnf-source of the 
            grammar. In case this is a directory and not a file all
            files within this directory ending with .ebnf will be 
            compiled.
100
101
        force(bool):  If False (default), the grammar will only be
            recompiled if it has been changed.
102
103
    """
    if os.path.isdir(ebnf_filename):
104
        success = True
105
106
        for entry in os.listdir(ebnf_filename):
            if entry.lower().endswith('.ebnf') and os.path.isfile(entry):
107
108
                success = success and recompile_grammar(entry, force)
        return success
109
110

    base, ext = os.path.splitext(ebnf_filename)
111
    compiler_name = base + 'Compiler.py'
112
    errors = []
113
    if (not os.path.exists(compiler_name) or force or
114
115
116
117
118
119
120
121
122
        grammar_changed(compiler_name, ebnf_filename)):
        # print("recompiling parser for: " + ebnf_filename)
        errors = compile_on_disk(ebnf_filename)
        if errors:
            # print("Errors while compiling: " + ebnf_filename + '!')
            with open(base + '_errors.txt', 'w') as f:
                for e in errors:
                    f.write(e)
                    f.write('\n')
123
            return False
124

125
126
127
    if not errors and os.path.exists(base + '_errors.txt'):
        os.remove(base + '_errors.txt')
    return True
128

129

130
UNIT_STAGES = {'match', 'fail', 'ast', 'cst', '__ast__', '__cst__'}
131
132


133
134
def unit_from_configfile(config_filename):
    """Reads a grammar unit test from a config file.
135
    """
136
    cfg = configparser.ConfigParser()
137
    cfg.read(config_filename)
138
139
    OD = collections.OrderedDict
    unit = OD()
140
141
    for section in cfg.sections():
        symbol, stage = section.split(':')
142
143
        if stage not in UNIT_STAGES:
            if symbol in UNIT_STAGES:
144
145
                symbol, stage = stage, symbol
            else:
146
                raise ValueError('Test stage %s not in: ' % (stage, str(UNIT_STAGES)))
147
        for testkey, testcode in cfg[section].items():
148
149
150
151
            if testcode[:3] + testcode[-3:] in {"''''''", '""""""'}:
                testcode = testcode[3:-3]
            elif testcode[:1] + testcode[-1:] in {"''", '""'}:
                testcode = testcode[1:-1]
152
            unit.setdefault(symbol, OD()).setdefault(stage, OD())[testkey] = testcode
153
154
    # print(json.dumps(unit, sort_keys=True, indent=4))
    return unit
155

156

157
def unit_from_json(json_filename):
158
159
    """Reads a grammar unit test from a json file.
    """
160
    with open(json_filename, 'r') as f:
161
162
163
164
165
166
167
        unit = json.load(f)
    for symbol in unit:
        for stage in unit[symbol]:
            if stage not in UNIT_STAGES:
                raise ValueError('Test stage %s not in: ' % (stage, str(UNIT_STAGES)))
    return unit

168
# TODO: add support for yaml, cson, toml
169
170


171
def unit_from_file(filename):
172
173
174
    """Reads a grammar unit test from a file. The format of the file is
    determined by the ending of its name.
    """
175
176
177
178
    if filename.endswith(".json"):
        return unit_from_json(filename)
    elif filename.endswith(".ini"):
        return unit_from_configfile(filename)
179
    else:
180
        raise ValueError("Unknown unit test file type: " + filename[filename.rfind('.'):])
181
182


183
def get_report(test_unit):
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
    """Returns a text-report of the results of a grammar unit test.
    """
    report = []
    for parser_name, tests in test_unit.items():
        heading = 'Test of parser: "%s"' % parser_name
        report.append('\n\n%s\n%s\n' % (heading, '=' * len(heading)))
        for test_name, test_code in tests.get('match', dict()).items():
            heading = 'Match-test "%s"' % test_name
            report.append('\n%s\n%s\n' % (heading, '-' * len(heading)))
            report.append('### Test-code:')
            report.append(test_code)
            error = tests.get('__err__', {}).get(test_name, "")
            if error:
                report.append('\n### Error:')
                report.append(error)
            ast = tests.get('__ast__', {}).get(test_name, None)
200
201
202
            cst = tests.get('__cst__', {}).get(test_name, None)
            if cst and (not ast or cst == ast):
                report.append('\n### CST')
203
                report.append(cst.as_sexpr())
204
            elif ast:
205
206
207
208
209
                report.append('\n### AST')
                report.append(ast.as_sexpr())
    return '\n'.join(report)


210
def grammar_unit(test_unit, parser_factory, transformer_factory, report=True, verbose=False):
211
212
    """Unit tests for a grammar-parser and ast transformations.
    """
213
    if isinstance(test_unit, str):
214
        unit_dir, unit_name = os.path.split(os.path.splitext(test_unit)[0])
215
        test_unit = unit_from_file(test_unit)
216
217
    else:
        unit_name = str(id(test_unit))
218
219
    if verbose:
        print("\nUnit: " + unit_name)
220
221
222
    errata = []
    parser = parser_factory()
    transform = transformer_factory()
223
224
    for parser_name, tests in test_unit.items():
        assert set(tests.keys()).issubset(UNIT_STAGES)
225
226
        if verbose:
            print('  Match-Tests for parser "' + parser_name + '"')
227
        for test_name, test_code in tests.get('match', dict()).items():
228
229
230
            if verbose:
                infostr = '    match-test "' + test_name + '" ... '
                errflag = len(errata)
231
            cst = parser(test_code, parser_name)
232
233
234
            if is_logging():
                cst.log("match_%s_%s.cst" % (parser_name, test_name))
                parser.log_parsing_history("match_%s_%s.log" % (parser_name, test_name))
235
            tests.setdefault('__cst__', {})[test_name] = cst
236
            if "ast" in tests or report:
237
238
239
                ast = copy.deepcopy(cst)
                transform(ast)
                tests.setdefault('__ast__', {})[test_name] = ast
240
241
                if is_logging():
                    ast.log("match_%s_%s.ast" % (parser_name, test_name))
242
            if cst.error_flag:
243
                errata.append('Match test "%s" for parser "%s" failed:\n\tExpr.:  %s\n\n\t%s' %
244
                              (test_name, parser_name, '\n\t'.join(test_code.split('\n')),
245
246
                               '\n\t'.join(m.replace('\n', '\n\t\t') for m in
                                           error_messages(test_code, cst.collect_errors()))))
247
                tests.setdefault('__err__', {})[test_name] = errata[-1]
248
249
250
251
252
253
254
255
256
257
258
            elif "cst" in tests and mock_syntax_tree(tests["cst"][test_name]) != cst:
                    errata.append('Concrete syntax tree test "%s" for parser "%s" failed:\n%s' %
                                  (test_name, parser_name, cst.as_sexpr()))
            elif "ast" in tests:
                compare = mock_syntax_tree(tests["ast"][test_name])
                if compare != ast:
                    errata.append('Abstract syntax tree test "%s" for parser "%s" failed:'
                                  '\n\tExpr.:     %s\n\tExpected:  %s\n\tReceived:  %s'
                                  % (test_name, parser_name, '\n\t'.join(test_code.split('\n')),
                                     compact_sexpr(compare.as_sexpr()),
                                     compact_sexpr(ast.as_sexpr())))
259
                    tests.setdefault('__err__', {})[test_name] = errata[-1]
260
            if verbose:
261
                print(infostr + ("OK" if len(errata) == errflag else "FAIL"))
262

263
        if verbose and 'fail' in tests:
264
            print('  Fail-Tests for parser "' + parser_name + '"')
265
        for test_name, test_code in tests.get('fail', dict()).items():
266
267
268
            if verbose:
                infostr = '    fail-test  "' + test_name + '" ... '
                errflag = len(errata)
269
            cst = parser(test_code, parser_name)
270
271
272
            if is_logging():
                cst.log("fail_%s_%s.cst" % (parser_name, test_name))
                parser.log_parsing_history("fail_%s_%s.log" % (parser_name, test_name))
273
274
275
            if not cst.error_flag:
                errata.append('Fail test "%s" for parser "%s" yields match instead of '
                              'expected failure!' % (test_name, parser_name))
276
                tests.setdefault('__err__', {})[test_name] = errata[-1]
277
278
            if verbose:
                print(infostr + "OK" if len(errata) == errflag else "FAIL")
279

280
281
    # write test-report
    if report:
282
283
284
285
        report_dir = os.path.join(unit_dir, "REPORT")
        if not os.path.exists(report_dir):
            os.mkdir(report_dir)
        with open(os.path.join(report_dir, unit_name + '.report'), 'w') as f:
286
            f.write(get_report(test_unit))
287

288
289
290
    return errata


291
def grammar_suite(directory, parser_factory, transformer_factory, ignore_unknown_filetypes=False,
292
                  report=True, verbose=False):
293
294
295
296
    """Runs all grammar unit tests in a directory. A file is considered a test
    unit, if it has the word "test" in its name.
    """
    all_errors = collections.OrderedDict()
297
298
    if verbose:
        print("\nScanning test-directory: " + directory)
299
300
301
    for filename in sorted(os.listdir(directory)):
        if filename.lower().find("test") >= 0:
            try:
302
303
                if verbose:
                    print("\nRunning grammar tests from: " + filename)
304
                errata = grammar_unit(os.path.join(directory, filename),
305
                                      parser_factory, transformer_factory, report, verbose)
306
307
308
                if errata:
                    all_errors[filename] = errata
            except ValueError as e:
309
                if not ignore_unknown_filetypes or str(e).find("Unknown") < 0:
310
311
312
313
314
315
316
317
                    raise e
    error_report = []
    if all_errors:
        for filename in all_errors:
            error_report.append('Errors found by unit test "%s":' % filename)
            for error in all_errors[filename]:
                error_report.append('\t' + '\n\t'.join(error.split('\n')))
    if error_report:
318
        return ('Test suite "%s" revealed some errors:\n\n' % directory) + '\n'.join(error_report)
319
320
321
    return ''


322
def runner(tests, namespace):
323
324
325
    """ Runs all or some selected Python unit tests found in the 
    namespace. To run all tests in a module, call 
    ``runner("", globals())`` from within that module.
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344

    Args:
        tests: Either a string or a list of strings that contains the
            names of test or test classes. Each test and, in the case
            of a test class, all tests within the test class will be
            run.
        namespace: The namespace for running the test, usually 
            ``globals()`` should be used.
            
    Example:
        class TestSomething()
            def setup(self):
                pass
            def teardown(self):
                pass
            def test_something(self):
                pass
                
        if __name__ == "__main__":
di68kap's avatar
di68kap committed
345
            from DHParser.testing import runner
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
            runner("", globals())        
    """
    def instantiate(cls_name):
        exec("obj = " + cls_name + "()", namespace)
        obj = namespace["obj"]
        if "setup" in dir(obj):
            obj.setup()
        return obj

    if tests:
        if isinstance(tests, str):
            tests = tests.split(" ")
    else:
        # collect all test classes, in case no methods or classes have been passed explicitly
        tests = []
        for name in namespace.keys():
            if name.lower().startswith('test') and inspect.isclass(namespace[name]):
                tests.append(name)

    obj = None
    for test in tests:
        try:
            if test.find('.') >= 0:
                cls_name, method_name = test.split('.')
                obj = instantiate(cls_name)
                print("Running " + cls_name + "." + method_name)
                exec('obj.' + method_name + '()')
            else:
                obj = instantiate(test)
                for name in dir(obj):
                    if name.lower().startswith("test"):
                        print("Running " + test + "." + name)
                        exec('obj.' + name + '()')
        finally:
            if "teardown" in dir(obj):
                obj.teardown()