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import re | ||
from dataclasses import dataclass, replace | ||
from typing import Generator, Optional | ||
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from packaging.requirements import Requirement | ||
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@dataclass | ||
class BaseNode: | ||
def with_changes(self, **kwargs): | ||
return replace(self, **kwargs) | ||
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def build(self, buf): | ||
raise NotImplementedError | ||
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def dump(self, buf, indent=""): | ||
raise NotImplementedError | ||
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@dataclass | ||
class UnparsedLine(BaseNode): | ||
orig_line: str | ||
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def build(self, buf): | ||
buf.write(self.orig_line) | ||
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def dump(self, buf, indent=""): | ||
buf.write(indent + repr(self) + "\n") | ||
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@dataclass | ||
class VcsRequirementLine(BaseNode): | ||
requirement: str | ||
newline: str = "\n" | ||
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def build(self, buf): | ||
buf.write(self.requirement) | ||
buf.write(self.newline) | ||
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def dump(self, buf, indent=""): | ||
buf.write(indent + repr(self) + "\n") | ||
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@dataclass | ||
class LocalPathRequirementLine(BaseNode): | ||
# ./foo | ||
# -e ../foo | ||
requirement: str | ||
newline: str = "\n" | ||
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def build(self, buf): | ||
buf.write(self.requirement) | ||
buf.write(self.newline) | ||
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def dump(self, buf, indent=""): | ||
buf.write(indent + repr(self) + "\n") | ||
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@dataclass | ||
class RequirementLine(BaseNode): | ||
# a parsed Requirement can't roundtrip | ||
requirement: str | ||
whitespace_before_requirement: str = "" | ||
whitespace_after_requirement: str = "" | ||
comment: str = "" | ||
newline: str = "\n" | ||
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def build(self, buf): | ||
buf.write(self.requirement) | ||
buf.write(self.whitespace_before_requirement) | ||
buf.write(self.whitespace_after_requirement) | ||
buf.write(self.comment) | ||
buf.write(self.newline) | ||
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def dump(self, buf, indent=""): | ||
buf.write(indent + repr(self) + "\n") | ||
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WELL_FORMED_REQUIREMENT_LINE = re.compile( | ||
r"([ \t]*)([^# \t][^#]*?)([ \t]*)(#.*?)?(\r?\n)$" | ||
) | ||
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@dataclass | ||
class RequirementFile: | ||
children: [BaseNode] = () | ||
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@classmethod | ||
def parse(cls, data: str) -> "RequirementFile": | ||
children: List[BaseNode] = [] | ||
if not data.endswith("\n"): | ||
if "\r\n" in data: | ||
data += "\r\n" | ||
else: | ||
data += "\n" | ||
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for line in data.splitlines(True): | ||
match = WELL_FORMED_REQUIREMENT_LINE.match(line) | ||
if not match: | ||
children.append(UnparsedLine(line)) | ||
continue | ||
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( | ||
whitespace_before_requirement, | ||
value, | ||
whitespace_after_requirement, | ||
comment, | ||
newline, | ||
) = match.groups() | ||
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if value.startswith(("-", "#")): | ||
children.append(UnparsedLine(line)) | ||
continue | ||
elif value.startswith((".", "/")): | ||
assert whitespace_before_requirement == "" | ||
assert whitespace_after_requirement == "" | ||
assert not comment | ||
children.append(LocalPathRequirementLine(value, newline)) | ||
continue | ||
# N.b. see COMMENT_RE in pip/req/req_file.py | ||
elif value and comment and not whitespace_after_requirement: | ||
# TODO strip | ||
value = value + whitespace_after_requirement + comment | ||
children.append(VcsRequirementLine(value, newline)) | ||
continue | ||
elif "://" in value: | ||
assert whitespace_before_requirement == "" | ||
assert whitespace_after_requirement == "" | ||
assert not comment | ||
children.append(VcsRequirementLine(value, newline)) | ||
continue | ||
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Requirement(value) # validates | ||
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children.append( | ||
RequirementLine( | ||
requirement=value, | ||
whitespace_before_requirement=whitespace_before_requirement, | ||
whitespace_after_requirement=whitespace_after_requirement, | ||
comment=comment, | ||
newline=newline, | ||
) | ||
) | ||
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return cls(children=children) | ||
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def build(self, buf): | ||
for c in self.children: | ||
c.build(buf) | ||
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def dump(self, buf, indent=""): | ||
for c in self.children: | ||
c.dump(buf, indent) | ||
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if __name__ == "__main__": | ||
import sys | ||
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try: | ||
RequirementFile.parse(open(sys.argv[1]).read()) | ||
except Exception as e: | ||
print(sys.argv[1]) | ||
raise |