bdca8b01d2
#pragma once is a widely supported compiler pragma, even though it is not part of the C++ standard. Many of the issues keeping #pragma once from being standardized (distributed filesystems, build farms, hard links, etc.) do not apply to CMake - it is easy to build CMake on a single machine. CMake also does not install any header files which can be consumed by other projects (though cmCPluginAPI.h has been deliberately omitted from this conversion in case anyone is still using it.) Finally, #pragma once has been required to build CMake since at least August 2017 (7f29bbe6enabled server mode unconditionally, which had been using #pragma once since September 2016 (b13d3e0d)). The fact that we now require C++11 filters out old compilers, and it is unlikely that there is a compiler which supports C++11 but does not support #pragma once.
117 lines
3.2 KiB
C++
117 lines
3.2 KiB
C++
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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file Copyright.txt or https://cmake.org/licensing for details. */
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#pragma once
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#include "cmConfigure.h" // IWYU pragma: keep
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#include <cstddef>
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#include <memory>
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#include <string>
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#include <utility>
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#include <vector>
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struct cmGeneratorExpressionContext;
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struct cmGeneratorExpressionDAGChecker;
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struct cmGeneratorExpressionNode;
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struct cmGeneratorExpressionEvaluator
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{
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cmGeneratorExpressionEvaluator() = default;
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virtual ~cmGeneratorExpressionEvaluator() = default;
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cmGeneratorExpressionEvaluator(cmGeneratorExpressionEvaluator const&) =
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delete;
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cmGeneratorExpressionEvaluator& operator=(
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cmGeneratorExpressionEvaluator const&) = delete;
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enum Type
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{
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Text,
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Generator
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};
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virtual Type GetType() const = 0;
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virtual std::string Evaluate(cmGeneratorExpressionContext* context,
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cmGeneratorExpressionDAGChecker*) const = 0;
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};
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using cmGeneratorExpressionEvaluatorVector =
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std::vector<std::unique_ptr<cmGeneratorExpressionEvaluator>>;
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struct TextContent : public cmGeneratorExpressionEvaluator
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{
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TextContent(const char* start, size_t length)
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: Content(start)
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, Length(length)
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{
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}
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std::string Evaluate(cmGeneratorExpressionContext*,
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cmGeneratorExpressionDAGChecker*) const override
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{
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return std::string(this->Content, this->Length);
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}
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Type GetType() const override
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{
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return cmGeneratorExpressionEvaluator::Text;
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}
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void Extend(size_t length) { this->Length += length; }
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size_t GetLength() { return this->Length; }
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private:
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const char* Content;
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size_t Length;
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};
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struct GeneratorExpressionContent : public cmGeneratorExpressionEvaluator
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{
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GeneratorExpressionContent(const char* startContent, size_t length);
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void SetIdentifier(cmGeneratorExpressionEvaluatorVector&& identifier)
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{
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this->IdentifierChildren = std::move(identifier);
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}
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void SetParameters(
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std::vector<cmGeneratorExpressionEvaluatorVector>&& parameters)
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{
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this->ParamChildren = std::move(parameters);
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}
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Type GetType() const override
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{
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return cmGeneratorExpressionEvaluator::Generator;
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}
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std::string Evaluate(cmGeneratorExpressionContext* context,
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cmGeneratorExpressionDAGChecker*) const override;
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std::string GetOriginalExpression() const;
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~GeneratorExpressionContent() override;
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private:
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std::string EvaluateParameters(const cmGeneratorExpressionNode* node,
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const std::string& identifier,
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cmGeneratorExpressionContext* context,
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cmGeneratorExpressionDAGChecker* dagChecker,
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std::vector<std::string>& parameters) const;
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std::string ProcessArbitraryContent(
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const cmGeneratorExpressionNode* node, const std::string& identifier,
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cmGeneratorExpressionContext* context,
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cmGeneratorExpressionDAGChecker* dagChecker,
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std::vector<cmGeneratorExpressionEvaluatorVector>::const_iterator pit)
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const;
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private:
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cmGeneratorExpressionEvaluatorVector IdentifierChildren;
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std::vector<cmGeneratorExpressionEvaluatorVector> ParamChildren;
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const char* StartContent;
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size_t ContentLength;
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};
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