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// Copyright 2016 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.skylarkinterface;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
/**
* An annotation for parameters of Skylark built-in functions.
*/
@Retention(RetentionPolicy.RUNTIME)
public @interface Param {
/**
* Name of the parameter, as viewed from Skylark. Used for named parameters and for generating
* documentation.
*/
String name();
/**
* Documentation of the parameter.
*/
String doc() default "";
/**
* Default value for the parameter, as a Skylark value (e.g. "False", "True", "[]", "None").
*/
String defaultValue() default "";
/**
* Type of the parameter, e.g. {@link String}.class or
* {@link com.google.devtools.build.lib.syntax.SkylarkList}.class.
*/
Class<?> type() default Object.class;
/**
* List of allowed types for the parameter if multiple types are allowed, and {@link #type()} is
* set to Object.class.
*/
ParamType[] allowedTypes() default {};
/**
* When {@link #type()} is a generic type (e.g.,
* {@link com.google.devtools.build.lib.syntax.SkylarkList}), specify the type parameter (e.g.
* {@link String}.class} along with {@link com.google.devtools.build.lib.syntax.SkylarkList} for
* {@link #type()} to specify a list of strings).
*/
Class<?> generic1() default Object.class;
/**
* Whether the name of a callback function can be given instead of a computed value. If a
* callback function is used then the value of this parameter will be computed only when
* actually requested. E.g., if a parameter {@code foo} of a function {@code bar} is passed a
* callback function, then only when the method {@code bar} actually asks for the value
* {@code foo}, replacing it by a
* {@link com.google.devtools.build.lib.syntax.SkylarkCallbackFunction} in between.
*/
boolean callbackEnabled() default false;
/**
* If true, this parameter can be passed the "None" value.
*/
boolean noneable() default false;
/**
* If true, the parameter may be specified as a named parameter. For example for an integer named
* parameter {@code foo} of a method {@code bar}, then the method call will look like
* {@code bar(foo=1)}.
*/
boolean named() default false;
/**
* If true, the parameter may be specified as a positional parameter. For example for an integer
* positional parameter {@code foo} of a method {@code bar}, then the method call will look like
* {@code bar(1)}. If {@link #named()} is {@code false}, then this will be the only way to call
* {@code bar}.
*
* <p>Positional arguments should come first.
*/
boolean positional() default true;
// TODO(bazel-team): parse the type from a single field in Skylark syntax,
// and allow a Union as "ThisType or ThatType or NoneType":
// String type() default "Object";
}
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