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The fuzzer now tries to reuse previous modfiications as well sometimes

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Dave Halter
2020-04-11 23:28:56 +02:00
parent 30a2b2f40d
commit 83cb71f7a1
1 changed files with 19 additions and 7 deletions
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26
test/fuzz_diff_parser.py
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@@ -102,9 +102,17 @@ class LineCopy:
class FileModification: class FileModification:
@classmethod @classmethod
def generate(cls, code_lines, change_count): def generate(cls, code_lines, change_count, previous_file_modification=None):
if previous_file_modification is not None and random.random() > 0.5:
# We want to keep the previous modifications in some cases to make
# more complex parser issues visible.
code_lines = previous_file_modification.apply(code_lines)
added_modifications = previous_file_modification.modification_list
else:
added_modifications = []
return cls( return cls(
list(cls._generate_line_modifications(code_lines, change_count)), added_modifications
+ list(cls._generate_line_modifications(code_lines, change_count)),
# work with changed trees more than with normal ones. # work with changed trees more than with normal ones.
check_original=random.random() > 0.8, check_original=random.random() > 0.8,
) )
@@ -158,18 +166,18 @@ class FileModification:
yield l yield l
def __init__(self, modification_list, check_original): def __init__(self, modification_list, check_original):
self._modification_list = modification_list self.modification_list = modification_list
self._check_original = check_original self._check_original = check_original
def _apply(self, code_lines): def apply(self, code_lines):
changed_lines = list(code_lines) changed_lines = list(code_lines)
for modification in self._modification_list: for modification in self.modification_list:
modification.apply(changed_lines) modification.apply(changed_lines)
return changed_lines return changed_lines
def run(self, grammar, code_lines, print_code): def run(self, grammar, code_lines, print_code):
code = ''.join(code_lines) code = ''.join(code_lines)
modified_lines = self._apply(code_lines) modified_lines = self.apply(code_lines)
modified_code = ''.join(modified_lines) modified_code = ''.join(modified_lines)
if print_code: if print_code:
@@ -228,8 +236,12 @@ class FileTests:
def run(self, grammar, debugger): def run(self, grammar, debugger):
def iterate(): def iterate():
fm = None
for _ in range(self._test_count): for _ in range(self._test_count):
fm = FileModification.generate(self._code_lines, self._change_count) fm = FileModification.generate(
self._code_lines, self._change_count,
previous_file_modification=fm
)
self._file_modifications.append(fm) self._file_modifications.append(fm)
yield fm yield fm