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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;
/**
* Syntax node for a function argument. This can be a key/value pair such as
* appears as a keyword argument to a function call or just an expression that
* is used as a positional argument. It also can be used for function definitions
* to identify the name (and optionally the default value) of the argument.
*/
public final class Argument extends ASTNode {
private final Ident name;
private final Expression value;
private final boolean kwargs;
/**
* Create a new argument.
* At call site: name is optional, value is mandatory. kwargs is true for ** arguments.
* At definition site: name is mandatory, (default) value is optional.
*/
public Argument(Ident name, Expression value, boolean kwargs) {
this.name = name;
this.value = value;
this.kwargs = kwargs;
}
public Argument(Ident name, Expression value) {
this.name = name;
this.value = value;
this.kwargs = false;
}
/**
* Creates an Argument with null as name. It can be used as positional arguments
* of function calls.
*/
public Argument(Expression value) {
this(null, value);
}
/**
* Creates an Argument with null as value. It can be used as a mandatory keyword argument
* of a function definition.
*/
public Argument(Ident name) {
this(name, null);
}
/**
* Returns the name of this keyword argument or null if this argument is
* positional.
*/
public Ident getName() {
return name;
}
/**
* Returns the String value of the Ident of this argument. Shortcut for arg.getName().getName().
*/
public String getArgName() {
return name.getName();
}
/**
* Returns the syntax of this argument expression.
*/
public Expression getValue() {
return value;
}
/**
* Returns true if this argument is positional.
*/
public boolean isPositional() {
return name == null && !kwargs;
}
/**
* Returns true if this argument is a keyword argument.
*/
public boolean isNamed() {
return name != null;
}
/**
* Returns true if this argument is a **kwargs argument.
*/
public boolean isKwargs() {
return kwargs;
}
/**
* Returns true if this argument has value.
*/
public boolean hasValue() {
return value != null;
}
@Override
public String toString() {
return isNamed() ? name + "=" + value : String.valueOf(value);
}
@Override
public void accept(SyntaxTreeVisitor visitor) {
visitor.visit(this);
}
}
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