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// 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.base.Function;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
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 MixedModeFunction {
private final ImmutableList<Argument> args;
private final ImmutableMap<String, Integer> argIndexes;
private final ImmutableMap<String, Object> defaultValues;
private final ImmutableList<Statement> statements;
private final SkylarkEnvironment definitionEnv;
private static ImmutableList<String> argumentToStringList(ImmutableList<Argument> args) {
Function<Argument, String> function = new Function<Argument, String>() {
@Override
public String apply(Argument id) {
return id.getArgName();
}
};
return ImmutableList.copyOf(Lists.transform(args, function));
}
private static int mandatoryArgNum(ImmutableList<Argument> args) {
int mandatoryArgNum = 0;
for (Argument arg : args) {
if (!arg.hasValue()) {
mandatoryArgNum++;
}
}
return mandatoryArgNum;
}
UserDefinedFunction(Ident function, ImmutableList<Argument> args,
ImmutableMap<String, Object> defaultValues,
ImmutableList<Statement> statements, SkylarkEnvironment definitionEnv) {
super(function.getName(), argumentToStringList(args), mandatoryArgNum(args), false,
function.getLocation());
this.args = args;
this.statements = statements;
this.definitionEnv = definitionEnv;
this.defaultValues = defaultValues;
ImmutableMap.Builder<String, Integer> argIndexes = new ImmutableMap.Builder<> ();
int i = 0;
for (Argument arg : args) {
if (!arg.isKwargs()) { // TODO(bazel-team): add varargs support?
argIndexes.put(arg.getArgName(), i++);
}
}
this.argIndexes = argIndexes.build();
}
public ImmutableList<Argument> getArgs() {
return args;
}
public Integer getArgIndex(String s) {
return argIndexes.get(s);
}
ImmutableMap<String, Object> getDefaultValues() {
return defaultValues;
}
ImmutableList<Statement> getStatements() {
return statements;
}
Location getLocation() {
return location;
}
@Override
public Object call(Object[] namedArguments, FuncallExpression ast, Environment env)
throws EvalException, InterruptedException {
SkylarkEnvironment functionEnv = SkylarkEnvironment.createEnvironmentForFunctionCalling(
env, definitionEnv, this);
// Registering the functions's arguments as variables in the local Environment
int i = 0;
for (Object arg : namedArguments) {
functionEnv.update(args.get(i++).getArgName(), arg);
}
try {
for (Statement stmt : statements) {
stmt.exec(functionEnv);
}
} catch (ReturnStatement.ReturnException e) {
return e.getValue();
}
return Environment.NONE;
}
}
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