71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
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/*
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* Copyright 2021 Google LLC.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SKSL_DSL_FUNCTION
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#define SKSL_DSL_FUNCTION
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#include "include/sksl/DSLBlock.h"
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#include "include/sksl/DSLType.h"
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namespace SkSL {
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class Block;
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class Variable;
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namespace dsl {
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class DSLType;
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class DSLFunction {
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public:
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template<class... Parameters>
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DSLFunction(const DSLType& returnType, const char* name, Parameters&... parameters)
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: fReturnType(&returnType.skslType()) {
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std::vector<const DSLVar*> parameterArray;
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parameterArray.reserve(sizeof...(parameters));
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// in C++17, we could just do:
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// (parameterArray.push_back(¶meters), ...);
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int unused[] = {0, (static_cast<void>(parameterArray.push_back(¶meters)), 0)...};
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static_cast<void>(unused);
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this->init(returnType, name, std::move(parameterArray));
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}
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virtual ~DSLFunction() = default;
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template<class... Stmt>
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void define(Stmt... stmts) {
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DSLBlock block = DSLBlock(DSLStatement(std::move(stmts))...);
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this->define(std::move(block));
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}
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void define(DSLBlock block);
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template<class... Args>
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DSLExpression operator()(Args... args) {
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ExpressionArray argArray;
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argArray.reserve_back(sizeof...(args));
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int unused[] = {0, (static_cast<void>(argArray.push_back(args.release())), 0)...};
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static_cast<void>(unused);
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return this->call(std::move(argArray));
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}
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private:
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void init(const DSLType& returnType, const char* name, std::vector<const DSLVar*> params);
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DSLExpression call(ExpressionArray args);
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const SkSL::Type* fReturnType;
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const /* SkSL::FunctionDeclaration* */void* fDecl;
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};
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} // namespace dsl
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} // namespace SkSL
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#endif
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