用C++对Duktape JavaScript引擎的简单封装。

最新推荐文章于 2024-10-09 09:22:30 发布

firebolt2002

最新推荐文章于 2024-10-09 09:22:30 发布

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分类专栏：工作笔记

本文链接：https://blog.youkuaiyun.com/firebolt2002/article/details/82049459

本文记录了对Duktape JavaScript引擎的简单封装过程，Duktape适合嵌入式系统，但API使用相对不便。作者分享了测试代码，包括duktape_helper.hpp、main.cpp和CMakeLists.txt，作为备忘。此外，还提及了v7和SpiderMonkey 1.8作为替代选项，对于嵌入式系统，v7足够，而SpiderMonkey虽然文档齐全，但体积较大。

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Duktape是款比较小巧的JavaScript引擎，适用于嵌入式系统，不过API使用不太方便，研究了两天决定放弃。下面把测试代码上来，做个备忘吧。

duktape_helper.hpp文件

#ifndef DUKTAPE_HELPER_HPP
#define DUKTAPE_HELPER_HPP

#include <memory>
#include <string>
#include <type_traits>
#include "duktape.h"

namespace duktape {

    class StackAssert {
    private:
        duk_context *m_context;
        unsigned m_expected;
        unsigned m_begin;
    public:
        /**
         * Create the stack checker.
         *
         * No-op if NDEBUG is set.
         *
         * \param ctx the context
         * \param expected the size expected relative to the already existing values
         */
        inline StackAssert(duk_context *ctx, unsigned expected = 0) noexcept
            : m_context(ctx)
            , m_expected(expected)
            , m_begin(static_cast<unsigned>(duk_get_top(ctx)))
        {

        }

        /**
         * Verify the expected size.
         *
         * No-op if NDEBUG is set.
         */
        inline ~StackAssert() noexcept
        {
            if (static_cast<unsigned>(duk_get_top(m_context)) - m_begin != m_expected) {
                std::fprintf(stderr, "Corrupt stack detection in StackAssert:\n");
                std::fprintf(stderr, "  Size at start:            %u\n", m_begin);
                std::fprintf(stderr, "  Size at end:              %d\n", duk_get_top(m_context));
                std::fprintf(stderr, "  Expected (user):          %u\n", m_expected);
                std::fprintf(stderr, "  Expected (adjusted):      %u\n", m_expecte