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import re
from .empty_constraint import EmptyConstraint
from .patterns import (
BASIC_CONSTRAINT,
CARET_CONSTRAINT,
TILDE_CONSTRAINT,
TILDE_PEP440_CONSTRAINT,
X_CONSTRAINT,
)
from .version import Version
from .version_constraint import VersionConstraint
from .version_range import VersionRange
from .version_union import VersionUnion
__version__ = "0.1.0"
def parse_constraint(constraints): # type: (str) -> VersionConstraint
if constraints == "*":
return VersionRange()
or_constraints = re.split(r"\s*\|\|?\s*", constraints.strip())
or_groups = []
for constraints in or_constraints:
and_constraints = re.split("(?<!^)(?<![=>< ,]) *(?<!-)[, ](?!-) *(?!,|$)", constraints)
constraint_objects = []
if len(and_constraints) > 1:
for constraint in and_constraints:
constraint_objects.append(parse_single_constraint(constraint))
else:
constraint_objects.append(parse_single_constraint(and_constraints[0]))
if len(constraint_objects) == 1:
constraint = constraint_objects[0]
else:
constraint = constraint_objects[0]
for next_constraint in constraint_objects[1:]:
constraint = constraint.intersect(next_constraint)
or_groups.append(constraint)
if len(or_groups) == 1:
return or_groups[0]
else:
return VersionUnion.of(*or_groups)
def parse_single_constraint(constraint): # type: (str) -> VersionConstraint
m = re.match(r"(?i)^v?[xX*](\.[xX*])*$", constraint)
if m:
return VersionRange()
# Tilde range
m = TILDE_CONSTRAINT.match(constraint)
if m:
version = Version.parse(m.group(1))
high = version.stable.next_minor
if len(m.group(1).split(".")) == 1:
high = version.stable.next_major
return VersionRange(version, high, include_min=True, always_include_max_prerelease=True)
# PEP 440 Tilde range (~=)
m = TILDE_PEP440_CONSTRAINT.match(constraint)
if m:
precision = 1
if m.group(3):
precision += 1
if m.group(4):
precision += 1
version = Version.parse(m.group(1))
if precision == 2:
low = version
high = version.stable.next_major
else:
low = Version(version.major, version.minor, version.patch)
high = version.stable.next_minor
return VersionRange(low, high, include_min=True, always_include_max_prerelease=True)
# Caret range
m = CARET_CONSTRAINT.match(constraint)
if m:
version = Version.parse(m.group(1))
return VersionRange(
version,
version.next_breaking,
include_min=True,
always_include_max_prerelease=True,
)
# X Range
m = X_CONSTRAINT.match(constraint)
if m:
op = m.group(1)
major = int(m.group(2))
minor = m.group(3)
if minor is not None:
version = Version(major, int(minor), 0)
result = VersionRange(
version,
version.next_minor,
include_min=True,
always_include_max_prerelease=True,
)
else:
if major == 0:
result = VersionRange(max=Version(1, 0, 0))
else:
version = Version(major, 0, 0)
result = VersionRange(
version,
version.next_major,
include_min=True,
always_include_max_prerelease=True,
)
if op == "!=":
result = VersionRange().difference(result)
return result
# Basic comparator
m = BASIC_CONSTRAINT.match(constraint)
if m:
op = m.group(1)
version = m.group(2)
if version == "dev":
version = "0.0-dev"
try:
version = Version.parse(version)
except ValueError:
raise ValueError("Could not parse version constraint: {}".format(constraint))
if op == "<":
return VersionRange(max=version)
elif op == "<=":
return VersionRange(max=version, include_max=True)
elif op == ">":
return VersionRange(min=version)
elif op == ">=":
return VersionRange(min=version, include_min=True)
elif op == "!=":
return VersionUnion(VersionRange(max=version), VersionRange(min=version))
else:
return version
raise ValueError("Could not parse version constraint: {}".format(constraint))