forked from mirrors/gecko-dev
d259591a1c
Differential Revision: https://phabricator.services.mozilla.com/D60898 --HG-- extra : moz-landing-system : lando
77 lines
2.6 KiB
Python
77 lines
2.6 KiB
Python
# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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from __future__ import absolute_import, print_function, unicode_literals
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from .attributes import keymatch
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def evaluate_keyed_by(value, item_name, attributes):
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"""
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For values which can either accept a literal value, or be keyed by some
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attributes, perform that lookup and return the result.
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For example, given item::
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by-test-platform:
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macosx-10.11/debug: 13
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win.*: 6
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default: 12
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a call to `evaluate_keyed_by(item, 'thing-name', {'test-platform': 'linux96')`
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would return `12`.
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The `item_name` parameter is used to generate useful error messages.
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Items can be nested as deeply as desired::
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by-test-platform:
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win.*:
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by-project:
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ash: ..
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cedar: ..
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linux: 13
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default: 12
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"""
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while True:
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if not isinstance(value, dict) or len(value) != 1:
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return value
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value_key = next(iter(value))
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if not value_key.startswith('by-'):
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return value
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keyed_by = value_key[3:] # strip off 'by-' prefix
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key = attributes.get(keyed_by)
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alternatives = next(iter(value.values()))
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if len(alternatives) == 1 and 'default' in alternatives:
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# Error out when only 'default' is specified as only alternatives,
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# because we don't need to by-{keyed_by} there.
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raise Exception(
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"Keyed-by '{}' unnecessary with only value 'default' "
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"found, when determining item {}".format(
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keyed_by, item_name))
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if key is None:
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if 'default' in alternatives:
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value = alternatives['default']
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continue
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else:
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raise Exception(
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"No attribute {} and no value for 'default' found "
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"while determining item {}".format(
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keyed_by, item_name))
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matches = keymatch(alternatives, key)
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if len(matches) > 1:
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raise Exception(
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"Multiple matching values for {} {!r} found while "
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"determining item {}".format(
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keyed_by, key, item_name))
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elif matches:
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value = matches[0]
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continue
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raise Exception(
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"No {} matching {!r} nor 'default' found while determining item {}".format(
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keyed_by, key, item_name))
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