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我正在玩 Christian Hergert GtkBuilder + Inline JavaScript,我写了一个 Glade 插件来编辑 JavaScript 代码。这是一个屏幕截图:


(来源:googlecode.com

我想通过 GJS(Spidermonker 1.7 GObject 绑定)识别 JavaScript 的功能。主要思想是在函数中分离脚本以创建像这样的源代码编辑器(如 Visual Basic):


(来源:googlecode.com

我不想评估脚本,然后尝试以下测试代码:

#include <gjs/gjs-module.h>
#include <gjs/gjs.h>
#include <string.h>
#include <stdio.h>

const char *script = 
    "const Gtk = imports.gi.Gtk;"
    ""
    "function onClicked(widget, data) {"
    "  let w = new Gtk.Window();"
    "  w.set_default_size(320, 240);"
    "  let l = new Gtk.Label();"
    "  l.set_text('You clicked on ' + widget.get_label());"
    "  w.add(l);"
    "  w.show_all();"
    "}"
    ""
    "var onQuit = function() {"
    "  Gtk.main_quit();"
    "}";

int
main (int argc, char *artv[])
{
  GjsContext *context;
  JSContext *native;
  JSScript *compiled;
  JSObject *object;
  JSObject *global;
  JSObject *callable = NULL;
  JSIdArray *array;
  JSBool status;
  jsval val = { 0 };
  int i;

  context = gjs_context_new();

  native = gjs_context_get_native_context(context);

  JS_BeginRequest(native);

  global = gjs_get_import_global(native);

  compiled = JS_CompileScript(native, global, script, strlen(script), "__test__", 0);

  if (compiled == NULL)
  {
    printf("error\n");
  }

  object =  JS_GetGlobalFromScript(compiled);

  array = JS_Enumerate(native, global);

  for (i = 0; i < JS_IdArrayLength(native, array); i++)
  {
    status = JS_GetPropertyById(native, object, JS_IdArrayGet(native, array, i), &val);

    callable = JSVAL_TO_OBJECT(val);

    if (JS_ObjectIsFunction(native, callable))
    {
      JSString *str = JS_ValueToString(native, val);
      printf("%s\n", JS_EncodeString(native, str));
      printf("%d, %p\n", status, callable);
    }
  }

  JS_EndRequest(native);

  return 0;
}

我需要得到 onClicked 和 onClick 但我得到:

function log() {
    [native code]
}
1, 0xb4c186c0
function logError() {
    [native code]
}
1, 0xb4c186e0
function print() {
    [native code]
}
1, 0xb4c18700
function printerr() {
    [native code]
}
1, 0xb4c18720

这些函数是 GJS 内部创建的,但是我的函数呢?有什么问题?是否可以使用 SpiderMonkey 1.7 获得这些功能?如果可能,如何获取每个函数的主体(代码)?我需要实现自己的 JS 解析器吗?

提前致谢。

最后,我使用 Spidermonkey 的 Reflect 解决了这个问题:

const Gio = imports.gi.Gio;
const Mainloop = imports.mainloop;

function load (filename)
{
  var file = Gio.file_new_for_path(filename);
  var contents;

  file.load_contents_async(null, function(file, result)
  {
    try
    {
      contents = file.load_contents_finish(result)[1];
    }
    catch (exception)
    {
      printerr(exception.message);
      Mainloop.quit('');

      return null;
    }
    Mainloop.quit('');

    return null; /* to avoid warning */
  });

  Mainloop.run('');

  return contents;
}

function print_function_info (node)
{
  print('function ' + node.id.name + ' at ' +
    node.loc.start.line + ':' + node.loc.start.column + '-' +
        node.loc.end.line + ':' + node.loc.end.column);
}

function parse_source (source)
{
  var reflect = Reflect.parse(load(ARGV[0]));

  for (var element in reflect.body)
  {
    var node = reflect.body[element];

    if (node.type == 'VariableDeclaration')
    {
      for (element in node.declarations)
      {
        var declaration = node.declarations[element];

        if (declaration.init.type == 'FunctionExpression')
        {
          print_function_info(declaration);
        }
      }
    }
    else if (node.type == 'FunctionDeclaration')
    {
      print_function_info(node);
    }
  }
}

function parse_file (file)
{
  parse_source(load(file));
}

function main ()
{
  if (ARGV.length != 1)
  {
    printerr("Usage: introspect.js filename");
  }
  else
  {
    parse_file(ARGV[0]);
  }
}

main ();
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