mirror of
https://github.com/matrix-construct/construct
synced 2024-08-23 18:14:46 +02:00
215 lines
5.2 KiB
C++
215 lines
5.2 KiB
C++
/*
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* Copyright (C) 2016 Charybdis Development Team
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* Copyright (C) 2016 Jason Volk <jason@zemos.net>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice is present in all copies.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#define HAVE_IRCD_JS_FUNCTION_H
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namespace ircd {
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namespace js {
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string decompile(const JS::Handle<JSFunction *> &, const bool &pretty = false);
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string display_name(const JSFunction &);
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string name(const JSFunction &);
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uint16_t arity(const JSFunction &f);
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bool is_ctor(const JSFunction &f);
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namespace basic {
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template<lifetime L>
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struct function
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:root<JSFunction *, L>
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{
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operator JSObject *() const;
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explicit operator script<L>() const;
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explicit operator string<L>() const;
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// js::value/js::object == lifetime::stack
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js::value operator()(const js::object &, const vector<js::value>::handle &) const;
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template<class... args> js::value operator()(const js::object &, args&&...) const;
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// new function
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template<class string_t>
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function(JS::AutoObjectVector &stack,
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const JS::CompileOptions &opts,
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const char *const &name,
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const std::vector<string_t> &args,
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const string_t &src);
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using root<JSFunction *, L>::root;
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explicit function(const value<L> &);
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function(JSFunction *const &);
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function(JSFunction &);
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};
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} // namespace basic
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using function = basic::function<lifetime::stack>;
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using heap_function = basic::function<lifetime::heap>;
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//
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// Implementation
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//
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namespace basic {
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template<lifetime L>
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function<L>::function(JSFunction &func)
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:function<L>::root::type{&func}
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{
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}
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template<lifetime L>
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function<L>::function(JSFunction *const &func)
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:function<L>::root::type{func}
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{
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if(unlikely(!this->get()))
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throw internal_error("NULL function");
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}
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template<lifetime L>
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function<L>::function(const value<L> &val)
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:function<L>::root::type
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{
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JS_ValueToFunction(*cx, val)
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}
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{
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if(!this->get())
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throw type_error("value is not a function");
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}
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template<lifetime L>
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template<class string_t>
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function<L>::function(JS::AutoObjectVector &stack,
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const JS::CompileOptions &opts,
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const char *const &name,
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const std::vector<string_t> &args,
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const string_t &src)
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:function<L>::root::type{}
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{
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std::vector<const typename string_t::value_type *> argp(args.size());
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std::transform(begin(args), end(args), begin(argp), []
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(const string_t &arg)
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{
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return arg.data();
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});
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if(!JS::CompileFunction(*cx,
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stack,
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opts,
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name,
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argp.size(),
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&argp.front(),
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src.data(),
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src.size(),
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&(*this)))
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{
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throw syntax_error("Failed to compile function");
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}
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}
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template<lifetime L>
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template<class... args>
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js::value
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function<L>::operator()(const js::object &that,
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args&&... a)
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const
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{
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vector<basic::value<lifetime::stack>> argv
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{{
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std::forward<args>(a)...
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}};
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return call(*this, that, decltype(argv)::handle(argv));
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}
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template<lifetime L>
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js::value
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function<L>::operator()(const js::object &that,
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const vector<js::value>::handle &argv)
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const
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{
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return call(*this, that, argv);
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}
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template<lifetime L>
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function<L>::operator string<L>()
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const
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{
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return decompile(*this, true);
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}
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template<lifetime L>
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function<L>::operator script<L>()
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const
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{
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return JS_GetFunctionScript(*cx, *this);
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}
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template<lifetime L>
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function<L>::operator JSObject *()
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const
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{
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const auto ret(JS_GetFunctionObject(this->get()));
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if(unlikely(!ret))
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throw type_error("function cannot cast to Object");
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return ret;
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}
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} // namespace basic
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inline bool
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is_ctor(const JSFunction &f)
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{
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return JS_IsConstructor(const_cast<JSFunction *>(&f));
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}
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inline uint16_t
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arity(const JSFunction &f)
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{
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return JS_GetFunctionArity(const_cast<JSFunction *>(&f));
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}
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inline string
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name(const JSFunction &f)
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{
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const auto ret(JS_GetFunctionId(const_cast<JSFunction *>(&f)));
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return ret? string(ret) : string("<unnamed>");
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}
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inline string
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display_name(const JSFunction &f)
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{
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const auto ret(JS_GetFunctionDisplayId(const_cast<JSFunction *>(&f)));
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return ret? string(ret) : string("<anonymous>");
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}
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inline string
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decompile(const JS::Handle<JSFunction *> &f,
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const bool &pretty)
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{
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uint flags(0);
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flags |= pretty? 0 : JS_DONT_PRETTY_PRINT;
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return JS_DecompileFunction(*cx, f, flags);
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}
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} // namespace js
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} // namespace ircd
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