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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.collect.ImmutableList;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* Syntax node for a function definition.
*/
public final class FunctionDefStatement extends Statement {
private final Identifier identifier;
private final FunctionSignature.WithValues<Expression, Expression> signature;
private final ImmutableList<Statement> statements;
private final ImmutableList<Parameter<Expression, Expression>> parameters;
public FunctionDefStatement(Identifier identifier,
Iterable<Parameter<Expression, Expression>> parameters,
FunctionSignature.WithValues<Expression, Expression> signature,
Iterable<Statement> statements) {
this.identifier = identifier;
this.parameters = ImmutableList.copyOf(parameters);
this.signature = signature;
this.statements = ImmutableList.copyOf(statements);
}
@Override
void doExec(Environment env) throws EvalException, InterruptedException {
List<Expression> defaultExpressions = signature.getDefaultValues();
ArrayList<Object> defaultValues = null;
if (defaultExpressions != null) {
defaultValues = new ArrayList<>(defaultExpressions.size());
for (Expression expr : defaultExpressions) {
defaultValues.add(expr.eval(env));
}
}
FunctionSignature sig = signature.getSignature();
if (env.getSemantics().incompatibleDisallowKeywordOnlyArgs
&& sig.getShape().getMandatoryNamedOnly() > 0) {
throw new EvalException(
getLocation(),
"Keyword-only argument is forbidden. You can temporarily disable this "
+ "error using the flag --incompatible_disallow_keyword_only_args=false");
}
env.update(
identifier.getName(),
new UserDefinedFunction(
identifier,
FunctionSignature.WithValues.create(sig, defaultValues, /*types=*/null),
statements,
env.getGlobals()));
}
@Override
public void prettyPrint(Appendable buffer, int indentLevel) throws IOException {
printIndent(buffer, indentLevel);
buffer.append("def ");
identifier.prettyPrint(buffer);
buffer.append('(');
String sep = "";
for (Parameter<?, ?> param : parameters) {
buffer.append(sep);
param.prettyPrint(buffer);
sep = ", ";
}
buffer.append("):\n");
printSuite(buffer, statements, indentLevel);
}
@Override
public String toString() {
return "def " + identifier + "(" + signature + "): ...\n";
}
public Identifier getIdentifier() {
return identifier;
}
public ImmutableList<Statement> getStatements() {
return statements;
}
public ImmutableList<Parameter<Expression, Expression>> getParameters() {
return parameters;
}
public FunctionSignature.WithValues<Expression, Expression> getSignature() {
return signature;
}
@Override
public void accept(SyntaxTreeVisitor visitor) {
visitor.visit(this);
}
@Override
void validate(final ValidationEnvironment env) throws EvalException {
FunctionSignature sig = signature.getSignature();
FunctionSignature.Shape shape = sig.getShape();
ImmutableList<String> names = sig.getNames();
List<Expression> defaultExpressions = signature.getDefaultValues();
int positionals = shape.getPositionals();
int mandatoryPositionals = shape.getMandatoryPositionals();
int namedOnly = shape.getNamedOnly();
int mandatoryNamedOnly = shape.getMandatoryNamedOnly();
boolean starArg = shape.hasStarArg();
boolean kwArg = shape.hasKwArg();
int named = positionals + namedOnly;
int args = named + (starArg ? 1 : 0) + (kwArg ? 1 : 0);
int startOptionals = mandatoryPositionals;
int endOptionals = named - mandatoryNamedOnly;
env.openScope();
int j = 0; // index for the defaultExpressions
for (int i = 0; i < args; i++) {
String name = names.get(i);
if (startOptionals <= i && i < endOptionals) {
defaultExpressions.get(j++).validate(env);
}
env.declare(name, getLocation());
}
for (Statement stmts : statements) {
stmts.validate(env);
}
env.closeScope();
}
}
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