git.roojs.org Git - roobuilder/blob - src/Palete/Javascript.vala

   1
   2 extern JSCore.Value jscore_object_call_as_function(
   3         JSCore.Context ctx,
   4         JSCore.Object object,
   5         JSCore.Object thisObject,
   6         string  val,
   7         out JSCore.Value exception
   8         );
   9
  10
  11
  12
  13 namespace Palete {
  14
  15         public errordomain JavascriptError {
  16                 MISSING_METHOD,
  17                 MISSING_FILE
  18
  19         }
  20
  21         Javascript instance = null;
  22
  23         public class Javascript {
  24
  25
  26                 public static JSCore.Object class_constructor(
  27                                 JSCore.Context ctx,
  28                                 JSCore.Object constructor,
  29                                 JSCore.Value[] arguments,
  30                               out JSCore.Value exception)
  31                 {
  32                         var c = new JSCore.Class (class_definition);
  33                         var o = new JSCore.Object (ctx, c, null);
  34                                 exception = null;
  35                         return o;
  36                 }
  37                 const JSCore.StaticFunction[] class_functions = {
  38                          { null, null, 0 }
  39                 };
  40                 const JSCore.ClassDefinition class_definition = {
  41                     0,
  42                     JSCore.ClassAttribute.None,
  43                     "App",
  44                     null,
  45
  46                     null,
  47                     class_functions,
  48
  49                     null,
  50                     null,
  51
  52                     null,
  53                     null,
  54                     null,
  55                     null,
  56
  57                     null,
  58                     null,
  59                     class_constructor,
  60                     null,
  61                     null
  62                 };
  63
  64
  65                 public JSCore.GlobalContext js_global_context =  null;
  66
  67                 public static Javascript singleton()
  68                 {
  69                         if (instance == null) {
  70                                 instance = new Javascript();
  71                         }
  72                         return instance;
  73                 }
  74                 public Javascript()
  75                 {
  76                         var goc = new JSCore.Class(  class_definition );
  77                         this.js_global_context = new JSCore.GlobalContext(goc);
  78
  79
  80                 }
  81                 public int validate(string code, out string res)
  82                 {
  83                         JSCore.Value ex;
  84                         unowned   JSCore.GlobalContext ctx = this.js_global_context;
  85                         this.js_global_context.check_script_syntax(
  86                                    new JSCore.String.with_utf8_c_string(code),
  87                                    null,
  88                                    0,
  89                                    out ex
  90                         );
  91                         res = "";
  92                         if (ex.is_null(ctx)) {
  93                                 return -1;
  94                         }
  95
  96
  97                         var exo = ex.to_object(ctx, null);
  98                         //unowned JSCore.PropertyNameArray property_names = exo.copy_property_names (ctx);
  99
 100
 101
 102
 103                         var js_string = new JSCore.String.with_utf8_c_string("line");
 104                         var line = exo.get_property(ctx, js_string, null).to_number(ctx,null);
 105
 106
 107
 108                         // see if we can convert exception string
 109                         char *c_string = new char[1024];
 110                         var err_string = ex.to_string_copy (ctx, null);
 111                         err_string.get_utf8_c_string (c_string, 1023);
 112                         res = (string)c_string;
 113                         //print ("Error on line %d\n%s\n", (int)line, res);
 114
 115                         var rline = (int) line;
 116
 117                         return rline > 0 ? rline -1 : 0;
 118
 119
 120                 }
 121                 /**
 122                  * extension API concept..
 123                  * javascript file.. loaded into jscore,
 124                  * then a method is called, with a string argument (json encoded)
 125                  *
 126                  */
 127                 public string executeFile(string fname, string call_method, string js_data)
 128                                 throws JavascriptError
 129                 {
 130
 131                         string file_data;
 132                         if (!FileUtils.test (fname, FileTest.EXISTS)) {
 133                                 throw new JavascriptError.MISSING_FILE("Plugin: file not found %s", fname);
 134                         }
 135                         try {
 136                                 FileUtils.get_contents(fname, out file_data);
 137                         } catch (GLib.Error e) {
 138                                 GLib.debug("Error file load failed: %s", e.message);
 139                                 return "";
 140                         }
 141                         var jfile_data = new JSCore.String.with_utf8_c_string(file_data);
 142                         var jmethod = new JSCore.String.with_utf8_c_string(call_method);
 143                         //var json_args = new JSCore.String.with_utf8_c_string(js_data);
 144
 145                         JSCore.Value exa;
 146                         JSCore.Value exb;
 147                         unowned JSCore.Value exc;
 148                            JSCore.Value exd;
 149                            unowned JSCore.Value exe;
 150
 151                         var goc = new JSCore.Class(  class_definition );
 152                         var ctx = new JSCore.GlobalContext(goc);
 153                         var othis = ctx.get_global_object();
 154
 155                         ctx.evaluate_script (
 156                                                 jfile_data,
 157                                                 othis,
 158                                                 null,
 159                                 0,
 160                                 out exa
 161                                 );
 162
 163
 164                         if (!othis.has_property(ctx,jmethod)) {
 165                                 throw new JavascriptError.MISSING_METHOD ("Plugin: missing method  %s", call_method);
 166
 167                         }
 168
 169                         var val =  othis.get_property (ctx, jmethod, out exb);
 170
 171                         if (!val.is_object(ctx)) {
 172                                 throw new JavascriptError.MISSING_METHOD ("Plugin: not a property not found  %s", call_method);
 173                         }
 174                         var oval = val.to_object(ctx,  out  exc);
 175
 176                         if (!oval.is_function(ctx)) {
 177                                 throw new JavascriptError.MISSING_METHOD ("Plugin: not a method  %s", call_method);
 178                         }
 179
 180
 181                          var res = jscore_object_call_as_function(
 182                                 ctx, oval, othis, js_data, out exd
 183                                 );
 184                      // this will never work, as we can not create arrays of Values - due to no
 185                      // free function being available..
 186                          //var args =  new JSCore.Value[1] ;
 187                          //args[0] = new JSCore.Value.string(ctx,json_args) ;
 188
 189                          //unowned JSCore.Value res = oval.call_as_function(ctx, othis, null, out exd);
 190                         // extract the text value from res...
 191                          JSCore.String  sv = res.to_string_copy ( ctx,  out  exe);
 192                          var length = sv.get_maximum_utf8_c_string_size();
 193                          var buf = new char[length];
 194
 195                          sv.get_utf8_c_string( buf, length);
 196
 197
 198                          print("ret:%s\n",(string)  buf);
 199                          return (string) buf;
 200
 201                 }
 202
 203
 204
 205         }
 206
 207
 208
 209
 210 }
 211