| // Copyright 2017 The Bazel Authors. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.google.devtools.build.lib.rules.cpp; |
| |
| import com.google.common.base.VerifyException; |
| import com.google.devtools.build.lib.collect.nestedset.Depset; |
| import com.google.devtools.build.lib.collect.nestedset.NestedSet; |
| import com.google.devtools.build.lib.rules.cpp.CcToolchainVariables.VariablesExtension; |
| import java.util.List; |
| import java.util.Map; |
| import net.starlark.java.eval.Dict; |
| import net.starlark.java.eval.EvalException; |
| import net.starlark.java.eval.Sequence; |
| |
| /** Class used to build VariablesExtension from a Starlark dictionary. */ |
| public class UserVariablesExtension implements VariablesExtension { |
| public Map<String, Object> variablesExtension; |
| |
| /** |
| * Converts a Starlark dictionary whose values can either be strings, string lists or string |
| * depsets to a regular Java map of objects. |
| */ |
| public UserVariablesExtension(Dict<?, ?> variablesExtension) throws EvalException { |
| this.variablesExtension = |
| Dict.cast(variablesExtension, String.class, Object.class, "variables_extension"); |
| // Check values are either string, string sequence or string depset |
| for (Map.Entry<String, Object> entry : this.variablesExtension.entrySet()) { |
| if (entry.getValue() instanceof Sequence) { |
| Sequence<?> sequence = (Sequence) entry.getValue(); |
| if (sequence.isEmpty()) { |
| continue; |
| } |
| if (!(sequence.get(0) instanceof String)) { |
| throw new EvalException( |
| "Trying to build UserVariableExtension, found non-string type in sequence."); |
| } |
| } else if (entry.getValue() instanceof Depset) { |
| Depset depset = (Depset) entry.getValue(); |
| if (depset.isEmpty()) { |
| continue; |
| } |
| if (!depset.getElementType().toString().equals("string")) { |
| throw new EvalException( |
| "Trying to build UserVariableExtension, found non-string type in depset."); |
| } |
| } else if (!(entry.getValue() instanceof String)) { |
| throw new EvalException( |
| "Trying to build UserVariableExtension, the value in the UserVariablesExtension dict" |
| + " must be a string, string sequence or depset."); |
| } |
| } |
| } |
| |
| @Override |
| public void addVariables(CcToolchainVariables.Builder builder) { |
| for (Map.Entry<String, Object> entry : variablesExtension.entrySet()) { |
| if (entry.getValue() instanceof Sequence) { |
| try { |
| List<String> sequence = |
| Sequence.cast(entry.getValue(), String.class, "string_sequence_variables_extension"); |
| builder.addStringSequenceVariable(entry.getKey(), sequence); |
| } catch (EvalException e) { |
| // Cannot throw, cast already checked in constructor. |
| } |
| } else if (entry.getValue() instanceof Depset) { |
| try { |
| NestedSet<String> nestedSet = |
| Depset.cast(entry.getValue(), String.class, "string_sequence_variables_extension"); |
| builder.addStringSequenceVariable(entry.getKey(), nestedSet); |
| } catch (EvalException e) { |
| // Cannot throw, cast already checked in constructor. |
| } |
| } else if (entry.getValue() instanceof String) { |
| String value = (String) entry.getValue(); |
| builder.addStringVariable(entry.getKey(), value); |
| } else { |
| // If it's any other type we should have thrown an EvalException in the constructor already. |
| throw new VerifyException(); |
| } |
| } |
| } |
| } |