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332 lines
13 KiB
332 lines
13 KiB
3 years ago
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# testing.py
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from contextlib import contextmanager
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from typing import Optional
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from .core import (
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ParserElement,
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ParseException,
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Keyword,
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__diag__,
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__compat__,
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)
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class pyparsing_test:
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"""
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namespace class for classes useful in writing unit tests
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"""
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class reset_pyparsing_context:
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"""
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Context manager to be used when writing unit tests that modify pyparsing config values:
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- packrat parsing
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- bounded recursion parsing
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- default whitespace characters.
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- default keyword characters
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- literal string auto-conversion class
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- __diag__ settings
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Example::
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with reset_pyparsing_context():
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# test that literals used to construct a grammar are automatically suppressed
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ParserElement.inlineLiteralsUsing(Suppress)
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term = Word(alphas) | Word(nums)
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group = Group('(' + term[...] + ')')
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# assert that the '()' characters are not included in the parsed tokens
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self.assertParseAndCheckList(group, "(abc 123 def)", ['abc', '123', 'def'])
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# after exiting context manager, literals are converted to Literal expressions again
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"""
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def __init__(self):
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self._save_context = {}
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def save(self):
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self._save_context["default_whitespace"] = ParserElement.DEFAULT_WHITE_CHARS
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self._save_context["default_keyword_chars"] = Keyword.DEFAULT_KEYWORD_CHARS
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self._save_context[
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"literal_string_class"
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] = ParserElement._literalStringClass
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self._save_context["verbose_stacktrace"] = ParserElement.verbose_stacktrace
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self._save_context["packrat_enabled"] = ParserElement._packratEnabled
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if ParserElement._packratEnabled:
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self._save_context[
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"packrat_cache_size"
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] = ParserElement.packrat_cache.size
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else:
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self._save_context["packrat_cache_size"] = None
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self._save_context["packrat_parse"] = ParserElement._parse
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self._save_context[
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"recursion_enabled"
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] = ParserElement._left_recursion_enabled
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self._save_context["__diag__"] = {
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name: getattr(__diag__, name) for name in __diag__._all_names
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}
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self._save_context["__compat__"] = {
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"collect_all_And_tokens": __compat__.collect_all_And_tokens
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}
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return self
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def restore(self):
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# reset pyparsing global state
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if (
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ParserElement.DEFAULT_WHITE_CHARS
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!= self._save_context["default_whitespace"]
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):
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ParserElement.set_default_whitespace_chars(
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self._save_context["default_whitespace"]
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)
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ParserElement.verbose_stacktrace = self._save_context["verbose_stacktrace"]
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Keyword.DEFAULT_KEYWORD_CHARS = self._save_context["default_keyword_chars"]
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ParserElement.inlineLiteralsUsing(
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self._save_context["literal_string_class"]
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)
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for name, value in self._save_context["__diag__"].items():
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(__diag__.enable if value else __diag__.disable)(name)
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ParserElement._packratEnabled = False
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if self._save_context["packrat_enabled"]:
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ParserElement.enable_packrat(self._save_context["packrat_cache_size"])
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else:
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ParserElement._parse = self._save_context["packrat_parse"]
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ParserElement._left_recursion_enabled = self._save_context[
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"recursion_enabled"
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]
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__compat__.collect_all_And_tokens = self._save_context["__compat__"]
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return self
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def copy(self):
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ret = type(self)()
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ret._save_context.update(self._save_context)
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return ret
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def __enter__(self):
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return self.save()
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def __exit__(self, *args):
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self.restore()
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class TestParseResultsAsserts:
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"""
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A mixin class to add parse results assertion methods to normal unittest.TestCase classes.
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"""
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def assertParseResultsEquals(
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self, result, expected_list=None, expected_dict=None, msg=None
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):
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"""
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Unit test assertion to compare a :class:`ParseResults` object with an optional ``expected_list``,
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and compare any defined results names with an optional ``expected_dict``.
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"""
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if expected_list is not None:
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self.assertEqual(expected_list, result.as_list(), msg=msg)
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if expected_dict is not None:
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self.assertEqual(expected_dict, result.as_dict(), msg=msg)
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def assertParseAndCheckList(
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self, expr, test_string, expected_list, msg=None, verbose=True
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):
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"""
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Convenience wrapper assert to test a parser element and input string, and assert that
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the resulting ``ParseResults.asList()`` is equal to the ``expected_list``.
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"""
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result = expr.parse_string(test_string, parse_all=True)
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if verbose:
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print(result.dump())
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else:
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print(result.as_list())
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self.assertParseResultsEquals(result, expected_list=expected_list, msg=msg)
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def assertParseAndCheckDict(
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self, expr, test_string, expected_dict, msg=None, verbose=True
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):
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"""
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Convenience wrapper assert to test a parser element and input string, and assert that
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the resulting ``ParseResults.asDict()`` is equal to the ``expected_dict``.
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"""
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result = expr.parse_string(test_string, parseAll=True)
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if verbose:
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print(result.dump())
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else:
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print(result.as_list())
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self.assertParseResultsEquals(result, expected_dict=expected_dict, msg=msg)
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def assertRunTestResults(
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self, run_tests_report, expected_parse_results=None, msg=None
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):
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"""
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Unit test assertion to evaluate output of ``ParserElement.runTests()``. If a list of
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list-dict tuples is given as the ``expected_parse_results`` argument, then these are zipped
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with the report tuples returned by ``runTests`` and evaluated using ``assertParseResultsEquals``.
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Finally, asserts that the overall ``runTests()`` success value is ``True``.
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:param run_tests_report: tuple(bool, [tuple(str, ParseResults or Exception)]) returned from runTests
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:param expected_parse_results (optional): [tuple(str, list, dict, Exception)]
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"""
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run_test_success, run_test_results = run_tests_report
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if expected_parse_results is not None:
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merged = [
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(*rpt, expected)
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for rpt, expected in zip(run_test_results, expected_parse_results)
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]
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for test_string, result, expected in merged:
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# expected should be a tuple containing a list and/or a dict or an exception,
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# and optional failure message string
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# an empty tuple will skip any result validation
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fail_msg = next(
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(exp for exp in expected if isinstance(exp, str)), None
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)
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expected_exception = next(
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(
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exp
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for exp in expected
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if isinstance(exp, type) and issubclass(exp, Exception)
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),
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None,
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)
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if expected_exception is not None:
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with self.assertRaises(
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expected_exception=expected_exception, msg=fail_msg or msg
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):
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if isinstance(result, Exception):
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raise result
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else:
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expected_list = next(
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(exp for exp in expected if isinstance(exp, list)), None
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)
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expected_dict = next(
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(exp for exp in expected if isinstance(exp, dict)), None
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)
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if (expected_list, expected_dict) != (None, None):
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self.assertParseResultsEquals(
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result,
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expected_list=expected_list,
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expected_dict=expected_dict,
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msg=fail_msg or msg,
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)
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else:
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# warning here maybe?
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print("no validation for {!r}".format(test_string))
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# do this last, in case some specific test results can be reported instead
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self.assertTrue(
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run_test_success, msg=msg if msg is not None else "failed runTests"
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)
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@contextmanager
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def assertRaisesParseException(self, exc_type=ParseException, msg=None):
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with self.assertRaises(exc_type, msg=msg):
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yield
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@staticmethod
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def with_line_numbers(
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s: str,
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start_line: Optional[int] = None,
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end_line: Optional[int] = None,
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expand_tabs: bool = True,
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eol_mark: str = "|",
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mark_spaces: Optional[str] = None,
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mark_control: Optional[str] = None,
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) -> str:
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"""
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Helpful method for debugging a parser - prints a string with line and column numbers.
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(Line and column numbers are 1-based.)
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:param s: tuple(bool, str - string to be printed with line and column numbers
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:param start_line: int - (optional) starting line number in s to print (default=1)
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:param end_line: int - (optional) ending line number in s to print (default=len(s))
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:param expand_tabs: bool - (optional) expand tabs to spaces, to match the pyparsing default
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:param eol_mark: str - (optional) string to mark the end of lines, helps visualize trailing spaces (default="|")
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:param mark_spaces: str - (optional) special character to display in place of spaces
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:param mark_control: str - (optional) convert non-printing control characters to a placeholding
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character; valid values:
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- "unicode" - replaces control chars with Unicode symbols, such as "␍" and "␊"
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- any single character string - replace control characters with given string
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- None (default) - string is displayed as-is
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:return: str - input string with leading line numbers and column number headers
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"""
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if expand_tabs:
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s = s.expandtabs()
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if mark_control is not None:
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if mark_control == "unicode":
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tbl = str.maketrans(
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{c: u for c, u in zip(range(0, 33), range(0x2400, 0x2433))}
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| {127: 0x2421}
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)
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eol_mark = ""
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else:
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tbl = str.maketrans(
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{c: mark_control for c in list(range(0, 32)) + [127]}
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)
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s = s.translate(tbl)
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if mark_spaces is not None and mark_spaces != " ":
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if mark_spaces == "unicode":
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tbl = str.maketrans({9: 0x2409, 32: 0x2423})
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s = s.translate(tbl)
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else:
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s = s.replace(" ", mark_spaces)
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if start_line is None:
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start_line = 1
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if end_line is None:
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end_line = len(s)
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end_line = min(end_line, len(s))
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start_line = min(max(1, start_line), end_line)
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if mark_control != "unicode":
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s_lines = s.splitlines()[start_line - 1 : end_line]
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else:
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s_lines = [line + "␊" for line in s.split("␊")[start_line - 1 : end_line]]
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if not s_lines:
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return ""
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lineno_width = len(str(end_line))
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max_line_len = max(len(line) for line in s_lines)
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lead = " " * (lineno_width + 1)
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if max_line_len >= 99:
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header0 = (
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lead
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+ "".join(
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"{}{}".format(" " * 99, (i + 1) % 100)
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for i in range(max(max_line_len // 100, 1))
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)
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+ "\n"
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)
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else:
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header0 = ""
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header1 = (
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header0
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+ lead
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+ "".join(
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" {}".format((i + 1) % 10)
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for i in range(-(-max_line_len // 10))
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)
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+ "\n"
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)
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header2 = lead + "1234567890" * (-(-max_line_len // 10)) + "\n"
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return (
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header1
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+ header2
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+ "\n".join(
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"{:{}d}:{}{}".format(i, lineno_width, line, eol_mark)
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for i, line in enumerate(s_lines, start=start_line)
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)
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+ "\n"
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)
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