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# Copyright 2017 Pants project contributors (see CONTRIBUTORS.md).
# Licensed under the Apache License, Version 2.0 (see LICENSE).
# A library of functions for filtering Python interpreters based on compatibility constraints
from .common import die
from .interpreter import PythonIdentity
from .tracer import TRACER
def validate_constraints(constraints):
# TODO: add check to see if constraints are mutually exclusive (bad) so no time is wasted:
# https://github.com/pantsbuild/pex/issues/432
for req in constraints:
# Check that the compatibility requirements are well-formed.
try:
PythonIdentity.parse_requirement(req)
except ValueError as e:
die("Compatibility requirements are not formatted properly: %s" % str(e))
def matched_interpreters(interpreters, constraints, meet_all_constraints=False):
"""Given some filters, yield any interpreter that matches at least one of them, or all of them
if meet_all_constraints is set to True.
:param interpreters: a list of PythonInterpreter objects for filtering
:param constraints: A sequence of strings that constrain the interpreter compatibility for this
pex, using the Requirement-style format, e.g. ``'CPython>=3', or just ['>=2.7','<3']``
for requirements agnostic to interpreter class.
:param meet_all_constraints: whether to match against all filters.
Defaults to matching interpreters that match at least one filter.
:return interpreter: returns a generator that yields compatible interpreters
"""
check = all if meet_all_constraints else any
for interpreter in interpreters:
if check(interpreter.identity.matches(filt) for filt in constraints):
TRACER.log("Constraints on interpreters: %s, Matching Interpreter: %s"
% (constraints, interpreter.binary), V=3)
yield interpreter
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