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Implement new name arrows

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This commit is contained in:
Joscha 2021-05-27 13:42:49 +02:00
parent 2c72a9112c
commit 80acc4b50d
1 changed files with 29 additions and 10 deletions
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39
PFERD/transformer.py
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@ -85,12 +85,29 @@ class NameRule(Rule):
self._subrule = subrule self._subrule = subrule
def transform(self, path: PurePath) -> Union[PurePath, bool]: def transform(self, path: PurePath) -> Union[PurePath, bool]:
name = PurePath(*path.parts[-1:]) matched = False
result = self._subrule.transform(name) result = PurePath()
if isinstance(result, PurePath):
return path.parent / result for part in path.parts:
else: part_result = self._subrule.transform(PurePath(part))
if isinstance(part_result, PurePath):
matched = True
result /= part_result
elif part_result:
# If any subrule call ignores its path segment, the entire path
# should be ignored
return True
else:
# The subrule doesn't modify this segment, but maybe other
# segments
result /= part
if matched:
return result return result
else:
# The subrule has modified no segments, so this name version of it
# doesn't match
return False
class ReRule(Rule): class ReRule(Rule):
@ -278,6 +295,7 @@ def parse_rule(line: Line) -> Rule:
if isinstance(left, bool): if isinstance(left, bool):
line.index = leftindex line.index = leftindex
raise RuleParseError(line, "Left side can't be '!'") raise RuleParseError(line, "Left side can't be '!'")
leftpath = PurePath(left)
# Parse arrow # Parse arrow
parse_whitespace(line) parse_whitespace(line)
@ -300,13 +318,14 @@ def parse_rule(line: Line) -> Rule:
# Dispatch # Dispatch
if arrowname == "": if arrowname == "":
return NormalRule(PurePath(left), rightpath) return NormalRule(leftpath, rightpath)
elif arrowname == "name": elif arrowname == "name":
return NameRule(NormalRule(PurePath(left), rightpath)) if len(leftpath.parts) > 1:
line.index = leftindex
raise RuleParseError(line, "SOURCE must be a single name, not multiple segments")
return NameRule(ExactRule(leftpath, rightpath))
elif arrowname == "exact": elif arrowname == "exact":
return ExactRule(PurePath(left), rightpath) return ExactRule(leftpath, rightpath)
elif arrowname == "name-exact":
return NameRule(ExactRule(PurePath(left), rightpath))
elif arrowname == "re": elif arrowname == "re":
return ReRule(left, right) return ReRule(left, right)
elif arrowname == "name-re": elif arrowname == "name-re":