83 lines
2.6 KiB
Python
83 lines
2.6 KiB
Python
# Copyright 2017 The Bazel Authors. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Skylib module containing convenience interfaces for select()."""
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def _with_or(input_dict, no_match_error = ""):
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"""Drop-in replacement for `select()` that supports ORed keys.
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Args:
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input_dict: The same dictionary `select()` takes, except keys may take
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either the usual form `"//foo:config1"` or
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`("//foo:config1", "//foo:config2", ...)` to signify
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`//foo:config1` OR `//foo:config2` OR `...`.
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no_match_error: Optional custom error to report if no condition matches.
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Example:
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```build
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deps = selects.with_or({
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"//configs:one": [":dep1"],
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("//configs:two", "//configs:three"): [":dep2or3"],
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"//configs:four": [":dep4"],
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"//conditions:default": [":default"]
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})
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```
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Key labels may appear at most once anywhere in the input.
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Returns:
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A native `select()` that expands
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`("//configs:two", "//configs:three"): [":dep2or3"]`
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to
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```build
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"//configs:two": [":dep2or3"],
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"//configs:three": [":dep2or3"],
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```
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"""
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return select(_with_or_dict(input_dict), no_match_error = no_match_error)
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def _with_or_dict(input_dict):
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"""Variation of `with_or` that returns the dict of the `select()`.
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Unlike `select()`, the contents of the dict can be inspected by Starlark
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macros.
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Args:
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input_dict: Same as `with_or`.
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Returns:
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A dictionary usable by a native `select()`.
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"""
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output_dict = {}
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for (key, value) in input_dict.items():
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if type(key) == type(()):
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for config_setting in key:
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if config_setting in output_dict.keys():
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fail("key %s appears multiple times" % config_setting)
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output_dict[config_setting] = value
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else:
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if key in output_dict.keys():
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fail("key %s appears multiple times" % key)
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output_dict[key] = value
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return output_dict
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selects = struct(
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with_or = _with_or,
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with_or_dict = _with_or_dict,
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)
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