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Define pkg as a PackageURL class attribute #184

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Define pkg as a PackageURL class attribute #184

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Define `pkg` as a PackageURL class attribute
jaimergp Mar 6, 2025
136403f
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jaimergp Mar 17, 2025
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10 changes: 7 additions & 3 deletions src/packageurl/__init__.py
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Original file line number Diff line number Diff line change
@@ -314,6 +314,8 @@ class PackageURL(
https://github.com/package-url/purl-spec
"""

SCHEME: str = "pkg"

type: str
namespace: str | None
name: str
@@ -409,7 +411,7 @@ def to_string(self) -> str:
encode=True,
)

purl = ["pkg:", type, "/"]
purl = [f"{self.SCHEME}:", type, "/"]

if namespace:
purl.extend((namespace, "/"))
@@ -440,8 +442,10 @@ def from_string(cls, purl: str) -> Self:
raise ValueError("A purl string argument is required.")

scheme, sep, remainder = purl.partition(":")
if not sep or scheme != "pkg":
raise ValueError(f'purl is missing the required "pkg" scheme component: {purl!r}.')
if not sep or scheme != cls.SCHEME:
raise ValueError(
f'purl is missing the required "{cls.SCHEME}" scheme component: {purl!r}.'
)

# this strip '/, // and /// as possible in :// or :///
remainder = remainder.strip().lstrip("/")
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