Line data    Source code

       1             : /* Copyright (C) 2021 Wildfire Games.
       2             :  * This file is part of 0 A.D.
       3             :  *
       4             :  * 0 A.D. is free software: you can redistribute it and/or modify
       5             :  * it under the terms of the GNU General Public License as published by
       6             :  * the Free Software Foundation, either version 2 of the License, or
       7             :  * (at your option) any later version.
       8             :  *
       9             :  * 0 A.D. is distributed in the hope that it will be useful,
      10             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12             :  * GNU General Public License for more details.
      13             :  *
      14             :  * You should have received a copy of the GNU General Public License
      15             :  * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
      16             :  */
      17             : 
      18             : #include "precompiled.h"
      19             : 
      20             : #include "JSON.h"
      21             : 
      22             : #include "ps/CStr.h"
      23             : #include "ps/Filesystem.h"
      24             : #include "scriptinterface/FunctionWrapper.h"
      25             : #include "scriptinterface/ScriptExceptions.h"
      26             : #include "scriptinterface/ScriptRequest.h"
      27             : #include "scriptinterface/ScriptTypes.h"
      28             : 
      29             : #include <string>
      30             : 
      31             : // Ignore warnings in SM headers.
      32             : #if GCC_VERSION || CLANG_VERSION
      33             : # pragma GCC diagnostic push
      34             : # pragma GCC diagnostic ignored "-Wunused-parameter"
      35             : # pragma GCC diagnostic ignored "-Wnon-virtual-dtor"
      36             : #elif MSC_VERSION
      37             : # pragma warning(push, 1)
      38             : #endif
      39             : 
      40             : #include "js/JSON.h"
      41             : 
      42             : #if GCC_VERSION || CLANG_VERSION
      43             : # pragma GCC diagnostic pop
      44             : #elif MSC_VERSION
      45             : # pragma warning(pop)
      46             : #endif
      47             : 
      48         154 : bool Script::ParseJSON(const ScriptRequest& rq, const std::string& string_utf8, JS::MutableHandleValue out)
      49             : {
      50         308 :     std::wstring attrsW = wstring_from_utf8(string_utf8);
      51         308 :     std::u16string string(attrsW.begin(), attrsW.end());
      52         154 :     if (JS_ParseJSON(rq.cx, string.c_str(), (u32)string.size(), out))
      53         149 :         return true;
      54             : 
      55           5 :     ScriptException::CatchPending(rq);
      56           5 :     return false;
      57             : }
      58             : 
      59          84 : void Script::ReadJSONFile(const ScriptRequest& rq, const VfsPath& path, JS::MutableHandleValue out)
      60             : {
      61          84 :     if (!VfsFileExists(path))
      62             :     {
      63           0 :         LOGERROR("File '%s' does not exist", path.string8());
      64           0 :         return;
      65             :     }
      66             : 
      67         168 :     CVFSFile file;
      68             : 
      69          84 :     PSRETURN ret = file.Load(g_VFS, path);
      70             : 
      71          84 :     if (ret != PSRETURN_OK)
      72             :     {
      73           0 :         LOGERROR("Failed to load file '%s': %s", path.string8(), GetErrorString(ret));
      74           0 :         return;
      75             :     }
      76             : 
      77         168 :     std::string content(file.DecodeUTF8()); // assume it's UTF-8
      78             : 
      79          84 :     if (!ParseJSON(rq, content, out))
      80           0 :         LOGERROR("Failed to parse '%s'", path.string8());
      81             : }
      82             : 
      83             : namespace
      84             : {
      85          20 : struct Stringifier
      86             : {
      87           9 :     static bool callback(const char16_t* buf, u32 len, void* data)
      88             :     {
      89          18 :         std::u16string str(buf, buf+len);
      90          18 :         std::wstring strw(str.begin(), str.end());
      91             : 
      92             :         Status err; // ignore Unicode errors
      93           9 :         static_cast<Stringifier*>(data)->stream << utf8_from_wstring(strw, &err);
      94          18 :         return true;
      95             :     }
      96             : 
      97             :     std::stringstream stream;
      98             : };
      99             : } // anonymous namespace
     100             : 
     101             : // JS_Stringify takes a mutable object because ToJSON may arbitrarily mutate the value.
     102             : // TODO: it'd be nice to have a non-mutable variant.
     103           1 : std::string Script::StringifyJSON(const ScriptRequest& rq, JS::MutableHandleValue obj, bool indent)
     104             : {
     105           2 :     Stringifier str;
     106           2 :     JS::RootedValue indentVal(rq.cx, indent ? JS::Int32Value(2) : JS::UndefinedValue());
     107           1 :     if (!JS_Stringify(rq.cx, obj, nullptr, indentVal, &Stringifier::callback, &str))
     108             :     {
     109           0 :         ScriptException::CatchPending(rq);
     110           0 :         return std::string();
     111             :     }
     112             : 
     113           1 :     return str.stream.str();
     114             : }
     115             : 
     116             : 
     117          21 : std::string Script::ToString(const ScriptRequest& rq, JS::MutableHandleValue obj, bool pretty)
     118             : {
     119          21 :     if (obj.isUndefined())
     120           0 :         return "(void 0)";
     121             : 
     122             :     // Try to stringify as JSON if possible
     123             :     // (TODO: this is maybe a bad idea since it'll drop 'undefined' values silently)
     124          21 :     if (pretty)
     125             :     {
     126          10 :         Stringifier str;
     127          10 :         JS::RootedValue indentVal(rq.cx, JS::Int32Value(2));
     128             : 
     129           9 :         if (JS_Stringify(rq.cx, obj, nullptr, indentVal, &Stringifier::callback, &str))
     130           8 :             return str.stream.str();
     131             : 
     132             :         // Drop exceptions raised by cyclic values before trying something else
     133           1 :         JS_ClearPendingException(rq.cx);
     134             :     }
     135             : 
     136             :     // Caller didn't want pretty output, or JSON conversion failed (e.g. due to cycles),
     137             :     // so fall back to obj.toSource()
     138             : 
     139          26 :     std::wstring source = L"(error)";
     140          13 :     ScriptFunction::Call(rq, obj, "toSource", source);
     141          13 :     return utf8_from_wstring(source);
     142             : }