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// Copyright 2018 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.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.skylarkinterface.Param;
import java.util.Arrays;
/** A value class for storing {@link Param} metadata to avoid using Java proxies. */
public final class ParamDescriptor {
private String name;
private final String defaultValue;
private final Class<?> type;
private final ImmutableList<ParamTypeDescriptor> allowedTypes;
private final Class<?> generic1;
private final boolean noneable;
private final boolean named;
private final boolean positional;
// While the type can be inferred completely by the Param annotation, this tuple allows for the
// type of a given parameter to be determined only once, as it is an expensive operation.
private final SkylarkType skylarkType;
private ParamDescriptor(
String name,
String doc,
String defaultValue,
Class<?> type,
ImmutableList<ParamTypeDescriptor> allowedTypes,
Class<?> generic1,
boolean callbackEnabled,
boolean noneable,
boolean named,
boolean legacyNamed,
boolean positional,
SkylarkType skylarkType) {
this.name = name;
this.defaultValue = defaultValue;
this.type = type;
this.allowedTypes = allowedTypes;
this.generic1 = generic1;
this.noneable = noneable;
this.named = named || legacyNamed;
this.positional = positional;
this.skylarkType = skylarkType;
}
static ParamDescriptor of(Param param) {
ImmutableList<ParamTypeDescriptor> allowedTypes =
Arrays.stream(param.allowedTypes())
.map(ParamTypeDescriptor::of)
.collect(ImmutableList.toImmutableList());
Class<?> type = param.type();
Class<?> generic = param.generic1();
boolean noneable = param.noneable();
return new ParamDescriptor(
param.name(),
param.doc(),
param.defaultValue(),
type,
allowedTypes,
generic,
param.callbackEnabled(),
noneable,
param.named(),
param.legacyNamed(),
param.positional(),
getType(type, generic, allowedTypes, noneable));
}
/** @see Param#name() */
public String getName() {
return name;
}
/** @see Param#allowedTypes() */
public ImmutableList<ParamTypeDescriptor> getAllowedTypes() {
return allowedTypes;
}
/** @see Param#type() */
public Class<?> getType() {
return type;
}
private static SkylarkType getType(
Class<?> type,
Class<?> generic,
ImmutableList<ParamTypeDescriptor> allowedTypes,
boolean noneable) {
SkylarkType result = SkylarkType.BOTTOM;
if (!allowedTypes.isEmpty()) {
Preconditions.checkState(Object.class.equals(type));
for (ParamTypeDescriptor paramType : allowedTypes) {
SkylarkType t =
paramType.getGeneric1() != Object.class
? SkylarkType.of(paramType.getType(), paramType.getGeneric1())
: SkylarkType.of(paramType.getType());
result = SkylarkType.Union.of(result, t);
}
} else {
result = generic != Object.class ? SkylarkType.of(type, generic) : SkylarkType.of(type);
}
if (noneable) {
result = SkylarkType.Union.of(result, SkylarkType.NONE);
}
return result;
}
/** @see Param#generic1() */
public Class<?> getGeneric1() {
return generic1;
}
/** @see Param#noneable() */
public boolean isNoneable() {
return noneable;
}
/** @see Param#positional() */
public boolean isPositional() {
return positional;
}
/** @see Param#named() */
public boolean isNamed() {
return named;
}
/** @see Param#defaultValue() */
public String getDefaultValue() {
return defaultValue;
}
SkylarkType getSkylarkType() {
return skylarkType;
}
}
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