| // Copyright 2014 Google Inc. 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.syntax; |
| |
| import com.google.common.collect.ImmutableList; |
| import com.google.devtools.build.lib.events.Location; |
| |
| /** |
| * The actual function registered in the environment. This function is defined in the |
| * parsed code using {@link FunctionDefStatement}. |
| */ |
| public class UserDefinedFunction extends BaseFunction { |
| |
| private final ImmutableList<Statement> statements; |
| private final SkylarkEnvironment definitionEnv; |
| |
| protected UserDefinedFunction(Ident function, |
| FunctionSignature.WithValues<Object, SkylarkType> signature, |
| ImmutableList<Statement> statements, SkylarkEnvironment definitionEnv) { |
| super(function.getName(), signature, function.getLocation()); |
| |
| this.statements = statements; |
| this.definitionEnv = definitionEnv; |
| } |
| |
| public FunctionSignature.WithValues<Object, SkylarkType> getFunctionSignature() { |
| return signature; |
| } |
| |
| ImmutableList<Statement> getStatements() { |
| return statements; |
| } |
| |
| Location getLocation() { |
| return location; |
| } |
| |
| |
| @Override |
| public Object call(Object[] arguments, FuncallExpression ast, Environment env) |
| throws EvalException, InterruptedException { |
| SkylarkEnvironment functionEnv = SkylarkEnvironment.createEnvironmentForFunctionCalling( |
| env, definitionEnv, this); |
| ImmutableList<String> names = signature.getSignature().getNames(); |
| |
| // Registering the functions's arguments as variables in the local Environment |
| int i = 0; |
| for (String name : names) { |
| functionEnv.update(name, arguments[i++]); |
| } |
| |
| try { |
| for (Statement stmt : statements) { |
| stmt.exec(functionEnv); |
| } |
| } catch (ReturnStatement.ReturnException e) { |
| return e.getValue(); |
| } |
| return Environment.NONE; |
| } |
| } |