forked from 0ad/0ad
wraitii
4f972bc623
Follows 34b1920e7b.
JSON functions and ToString are movec to their own headers.
Also clean out a few PersistentRooted usage to use the 2-phase init to
clean up scriptInterface usage.
With these functions split off, we can finally clean out headers and
remove ScriptInterface.h from most of them, in favour of smaller and
more precise headers.
Take the opportunity to clarify some comments regarding Mutability.
Differential Revision: https://code.wildfiregames.com/D3961
This was SVN commit r25434.
142 lines
3.9 KiB
C++
142 lines
3.9 KiB
C++
/* Copyright (C) 2021 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "precompiled.h"
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#include "JSON.h"
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#include "ps/CStr.h"
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#include "ps/Filesystem.h"
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#include "ps/utf16string.h"
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#include "scriptinterface/FunctionWrapper.h"
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#include "scriptinterface/ScriptExceptions.h"
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#include "scriptinterface/ScriptRequest.h"
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#include "scriptinterface/ScriptTypes.h"
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// Ignore warnings in SM headers.
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#if GCC_VERSION || CLANG_VERSION
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# pragma GCC diagnostic push
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# pragma GCC diagnostic ignored "-Wunused-parameter"
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# pragma GCC diagnostic ignored "-Wnon-virtual-dtor"
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#elif MSC_VERSION
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# pragma warning(push, 1)
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#endif
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#include "js/JSON.h"
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#if GCC_VERSION || CLANG_VERSION
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# pragma GCC diagnostic pop
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#elif MSC_VERSION
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# pragma warning(pop)
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#endif
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bool Script::ParseJSON(const ScriptRequest& rq, const std::string& string_utf8, JS::MutableHandleValue out)
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{
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std::wstring attrsW = wstring_from_utf8(string_utf8);
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utf16string string(attrsW.begin(), attrsW.end());
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if (JS_ParseJSON(rq.cx, reinterpret_cast<const char16_t*>(string.c_str()), (u32)string.size(), out))
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return true;
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ScriptException::CatchPending(rq);
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return false;
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}
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void Script::ReadJSONFile(const ScriptRequest& rq, const VfsPath& path, JS::MutableHandleValue out)
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{
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if (!VfsFileExists(path))
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{
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LOGERROR("File '%s' does not exist", path.string8());
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return;
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}
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CVFSFile file;
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PSRETURN ret = file.Load(g_VFS, path);
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if (ret != PSRETURN_OK)
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{
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LOGERROR("Failed to load file '%s': %s", path.string8(), GetErrorString(ret));
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return;
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}
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std::string content(file.DecodeUTF8()); // assume it's UTF-8
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if (!ParseJSON(rq, content, out))
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LOGERROR("Failed to parse '%s'", path.string8());
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}
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namespace
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{
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struct Stringifier
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{
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static bool callback(const char16_t* buf, u32 len, void* data)
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{
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utf16string str(buf, buf+len);
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std::wstring strw(str.begin(), str.end());
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Status err; // ignore Unicode errors
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static_cast<Stringifier*>(data)->stream << utf8_from_wstring(strw, &err);
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return true;
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}
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std::stringstream stream;
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};
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} // anonymous namespace
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// JS_Stringify takes a mutable object because ToJSON may arbitrarily mutate the value.
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// TODO: it'd be nice to have a non-mutable variant.
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std::string Script::StringifyJSON(const ScriptRequest& rq, JS::MutableHandleValue obj, bool indent)
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{
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Stringifier str;
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JS::RootedValue indentVal(rq.cx, indent ? JS::Int32Value(2) : JS::UndefinedValue());
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if (!JS_Stringify(rq.cx, obj, nullptr, indentVal, &Stringifier::callback, &str))
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{
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ScriptException::CatchPending(rq);
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return std::string();
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}
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return str.stream.str();
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}
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std::string Script::ToString(const ScriptRequest& rq, JS::MutableHandleValue obj, bool pretty)
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{
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if (obj.isUndefined())
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return "(void 0)";
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// Try to stringify as JSON if possible
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// (TODO: this is maybe a bad idea since it'll drop 'undefined' values silently)
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if (pretty)
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{
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Stringifier str;
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JS::RootedValue indentVal(rq.cx, JS::Int32Value(2));
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if (JS_Stringify(rq.cx, obj, nullptr, indentVal, &Stringifier::callback, &str))
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return str.stream.str();
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// Drop exceptions raised by cyclic values before trying something else
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JS_ClearPendingException(rq.cx);
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}
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// Caller didn't want pretty output, or JSON conversion failed (e.g. due to cycles),
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// so fall back to obj.toSource()
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std::wstring source = L"(error)";
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ScriptFunction::Call(rq, obj, "toSource", source);
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return utf8_from_wstring(source);
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}
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