72 lines
1.9 KiB
C++
72 lines
1.9 KiB
C++
// Copyright 2020 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SRC_TINT_AST_ATTRIBUTE_H_
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#define SRC_TINT_AST_ATTRIBUTE_H_
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#include <string>
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#include <vector>
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#include "src/tint/ast/node.h"
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namespace tint {
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namespace ast {
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/// The base class for all attributes
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class Attribute : public Castable<Attribute, Node> {
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public:
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~Attribute() override;
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/// @returns the WGSL name for the attribute
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virtual std::string Name() const = 0;
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protected:
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/// Constructor
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/// @param pid the identifier of the program that owns this node
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/// @param src the source of this node
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Attribute(ProgramID pid, const Source& src) : Base(pid, src) {}
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};
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/// A list of attributes
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using AttributeList = std::vector<const Attribute*>;
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/// @param attributes the list of attributes to search
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/// @returns true if `attributes` includes a attribute of type `T`
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template <typename T>
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bool HasAttribute(const AttributeList& attributes) {
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for (auto* attr : attributes) {
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if (attr->Is<T>()) {
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return true;
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}
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}
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return false;
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}
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/// @param attributes the list of attributes to search
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/// @returns a pointer to `T` from `attributes` if found, otherwise nullptr.
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template <typename T>
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const T* GetAttribute(const AttributeList& attributes) {
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for (auto* attr : attributes) {
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if (attr->Is<T>()) {
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return attr->As<T>();
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}
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}
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return nullptr;
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}
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} // namespace ast
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} // namespace tint
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#endif // SRC_TINT_AST_ATTRIBUTE_H_
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