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/* Copyright (C) 2021 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
#include "precompiled.h"
#include "JSON.h"
#include "ps/CStr.h"
#include "ps/Filesystem.h"
#include "scriptinterface/FunctionWrapper.h"
#include "scriptinterface/ScriptExceptions.h"
#include "scriptinterface/ScriptRequest.h"
#include "scriptinterface/ScriptTypes.h"
#include <string>
// Ignore warnings in SM headers.
#if GCC_VERSION || CLANG_VERSION
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wunused-parameter"
# pragma GCC diagnostic ignored "-Wnon-virtual-dtor"
#elif MSC_VERSION
# pragma warning(push, 1)
#endif
#include "js/JSON.h"
#if GCC_VERSION || CLANG_VERSION
# pragma GCC diagnostic pop
#elif MSC_VERSION
# pragma warning(pop)
#endif
bool Script::ParseJSON(const ScriptRequest& rq, const std::string& string_utf8, JS::MutableHandleValue out)
{
std::wstring attrsW = wstring_from_utf8(string_utf8);
std::u16string string(attrsW.begin(), attrsW.end());
if (JS_ParseJSON(rq.cx, string.c_str(), (u32)string.size(), out))
return true;
ScriptException::CatchPending(rq);
return false;
}
void Script::ReadJSONFile(const ScriptRequest& rq, const VfsPath& path, JS::MutableHandleValue out)
{
if (!VfsFileExists(path))
{
LOGERROR("File '%s' does not exist", path.string8());
return;
}
CVFSFile file;
PSRETURN ret = file.Load(g_VFS, path);
if (ret != PSRETURN_OK)
{
LOGERROR("Failed to load file '%s': %s", path.string8(), GetErrorString(ret));
return;
}
std::string content(file.DecodeUTF8()); // assume it's UTF-8
if (!ParseJSON(rq, content, out))
LOGERROR("Failed to parse '%s'", path.string8());
}
namespace
{
struct Stringifier
{
static bool callback(const char16_t* buf, u32 len, void* data)
{
std::u16string str(buf, buf+len);
std::wstring strw(str.begin(), str.end());
Status err; // ignore Unicode errors
static_cast<Stringifier*>(data)->stream << utf8_from_wstring(strw, &err);
return true;
}
std::stringstream stream;
};
} // anonymous namespace
// JS_Stringify takes a mutable object because ToJSON may arbitrarily mutate the value.
// TODO: it'd be nice to have a non-mutable variant.
std::string Script::StringifyJSON(const ScriptRequest& rq, JS::MutableHandleValue obj, bool indent)
{
Stringifier str;
JS::RootedValue indentVal(rq.cx, indent ? JS::Int32Value(2) : JS::UndefinedValue());
if (!JS_Stringify(rq.cx, obj, nullptr, indentVal, &Stringifier::callback, &str))
{
ScriptException::CatchPending(rq);
return std::string();
}
return str.stream.str();
}
std::string Script::ToString(const ScriptRequest& rq, JS::MutableHandleValue obj, bool pretty)
{
if (obj.isUndefined())
return "(void 0)";
// Try to stringify as JSON if possible
// (TODO: this is maybe a bad idea since it'll drop 'undefined' values silently)
if (pretty)
{
Stringifier str;
JS::RootedValue indentVal(rq.cx, JS::Int32Value(2));
if (JS_Stringify(rq.cx, obj, nullptr, indentVal, &Stringifier::callback, &str))
return str.stream.str();
// Drop exceptions raised by cyclic values before trying something else
JS_ClearPendingException(rq.cx);
}
// Caller didn't want pretty output, or JSON conversion failed (e.g. due to cycles),
// so fall back to obj.toSource()
std::wstring source = L"(error)";
ScriptFunction::Call(rq, obj, "toSource", source);
return utf8_from_wstring(source);
}
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