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// Copyright 2014 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.syntax;
import com.google.common.base.Optional;
import com.google.devtools.build.lib.syntax.compiler.DebugInfo;
import com.google.devtools.build.lib.syntax.compiler.LoopLabels;
import com.google.devtools.build.lib.syntax.compiler.VariableScope;
import net.bytebuddy.implementation.bytecode.ByteCodeAppender;
/**
* Syntax node for an assignment statement.
*/
public final class AssignmentStatement extends Statement {
private final LValue lvalue;
private final Expression expression;
/**
* Constructs an assignment: "lvalue := value".
*/
AssignmentStatement(Expression lvalue, Expression expression) {
this.lvalue = new LValue(lvalue);
this.expression = expression;
}
/**
* Returns the LHS of the assignment.
*/
public LValue getLValue() {
return lvalue;
}
/**
* Returns the RHS of the assignment.
*/
public Expression getExpression() {
return expression;
}
@Override
public String toString() {
return lvalue + " = " + expression + '\n';
}
@Override
void doExec(Environment env) throws EvalException, InterruptedException {
Object rvalue = expression.eval(env);
lvalue.assign(env, getLocation(), rvalue);
}
@Override
public void accept(SyntaxTreeVisitor visitor) {
visitor.visit(this);
}
@Override
void validate(ValidationEnvironment env) throws EvalException {
expression.validate(env);
lvalue.validate(env, getLocation());
}
@Override
ByteCodeAppender compile(
VariableScope scope, Optional<LoopLabels> loopLabels, DebugInfo debugInfo)
throws EvalException {
return new ByteCodeAppender.Compound(
expression.compile(scope, debugInfo),
lvalue.compileAssignment(this, debugInfo.add(this), scope));
}
}
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