src/ecmascript/spidermonkey.c

   1 /* The SpiderMonkey ECMAScript backend. */
   2
   3 #ifdef HAVE_CONFIG_H
   4 #include "config.h"
   5 #endif
   6
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10
  11 #include "elinks.h"
  12
  13 #include "ecmascript/spidermonkey/util.h"
  14
  15 #include "bfu/dialog.h"
  16 #include "cache/cache.h"
  17 #include "cookies/cookies.h"
  18 #include "dialogs/menu.h"
  19 #include "dialogs/status.h"
  20 #include "document/html/frames.h"
  21 #include "document/document.h"
  22 #include "document/forms.h"
  23 #include "document/view.h"
  24 #include "ecmascript/ecmascript.h"
  25 #include "ecmascript/spidermonkey.h"
  26 #include "ecmascript/spidermonkey/document.h"
  27 #include "ecmascript/spidermonkey/form.h"
  28 #include "ecmascript/spidermonkey/location.h"
  29 #include "ecmascript/spidermonkey/navigator.h"
  30 #include "ecmascript/spidermonkey/unibar.h"
  31 #include "ecmascript/spidermonkey/window.h"
  32 #include "intl/gettext/libintl.h"
  33 #include "main/select.h"
  34 #include "osdep/newwin.h"
  35 #include "osdep/sysname.h"
  36 #include "protocol/http/http.h"
  37 #include "protocol/uri.h"
  38 #include "session/history.h"
  39 #include "session/location.h"
  40 #include "session/session.h"
  41 #include "session/task.h"
  42 #include "terminal/tab.h"
  43 #include "terminal/terminal.h"
  44 #include "util/conv.h"
  45 #include "util/string.h"
  46 #include "viewer/text/draw.h"
  47 #include "viewer/text/form.h"
  48 #include "viewer/text/link.h"
  49 #include "viewer/text/vs.h"
  50
  51
  52
  53 /*** Global methods */
  54
  55
  56 /* TODO? Are there any which need to be implemented? */
  57
  58 static int js_module_init_ok;
  59
  60 void
  61 spidermonkey_error_reporter(JSContext *ctx, const char *message, JSErrorReport *report)
  62 {
  63         struct ecmascript_interpreter *interpreter = JS_GetContextPrivate(ctx);
  64         struct session *ses = interpreter->vs->doc_view->session;
  65         struct terminal *term;
  66         unsigned char *strict, *exception, *warning, *error;
  67         struct string msg;
  68
  69         assert(interpreter && interpreter->vs && interpreter->vs->doc_view
  70                && ses && ses->tab);
  71         if_assert_failed goto reported;
  72
  73         term = ses->tab->term;
  74
  75 #ifdef CONFIG_LEDS
  76         set_led_value(ses->status.ecmascript_led, 'J');
  77 #endif
  78
  79         if (!get_opt_bool("ecmascript.error_reporting", ses)
  80             || !init_string(&msg))
  81                 goto reported;
  82
  83         strict    = JSREPORT_IS_STRICT(report->flags) ? " strict" : "";
  84         exception = JSREPORT_IS_EXCEPTION(report->flags) ? " exception" : "";
  85         warning   = JSREPORT_IS_WARNING(report->flags) ? " warning" : "";
  86         error     = !report->flags ? " error" : "";
  87
  88         add_format_to_string(&msg, _("A script embedded in the current "
  89                         "document raised the following%s%s%s%s", term),
  90                         strict, exception, warning, error);
  91
  92         add_to_string(&msg, ":\n\n");
  93         add_to_string(&msg, message);
  94
  95         if (report->linebuf && report->tokenptr) {
  96                 int pos = report->tokenptr - report->linebuf;
  97
  98                 add_format_to_string(&msg, "\n\n%s\n.%*s^%*s.",
  99                                report->linebuf,
 100                                pos - 2, " ",
 101                                strlen(report->linebuf) - pos - 1, " ");
 102         }
 103
 104         info_box(term, MSGBOX_FREE_TEXT, N_("JavaScript Error"), ALIGN_CENTER,
 105                  msg.source);
 106
 107 reported:
 108         /* Im clu'les. --pasky */
 109         JS_ClearPendingException(ctx);
 110 }
 111
 112 static JSBool
 113 safeguard(JSContext *ctx, JSScript *script)
 114 {
 115         struct ecmascript_interpreter *interpreter = JS_GetContextPrivate(ctx);
 116         struct session *ses = interpreter->vs->doc_view->session;
 117         int max_exec_time = get_opt_int("ecmascript.max_exec_time", ses);
 118
 119         if (time(NULL) - interpreter->exec_start > max_exec_time) {
 120                 struct terminal *term = ses->tab->term;
 121
 122                 /* A killer script! Alert! */
 123                 ecmascript_timeout_dialog(term, max_exec_time);
 124                 return JS_FALSE;
 125         }
 126         return JS_TRUE;
 127 }
 128
 129 static void
 130 setup_safeguard(struct ecmascript_interpreter *interpreter,
 131                 JSContext *ctx)
 132 {
 133         interpreter->exec_start = time(NULL);
 134         JS_SetBranchCallback(ctx, safeguard);
 135 }
 136
 137
 138 static void
 139 spidermonkey_init(struct module *xxx)
 140 {
 141         js_module_init_ok = spidermonkey_runtime_addref();
 142 }
 143
 144 static void
 145 spidermonkey_done(struct module *xxx)
 146 {
 147         if (js_module_init_ok)
 148                 spidermonkey_runtime_release();
 149 }
 150
 151
 152 void *
 153 spidermonkey_get_interpreter(struct ecmascript_interpreter *interpreter)
 154 {
 155         JSContext *ctx;
 156         JSObject *window_obj, *document_obj, *forms_obj, *history_obj, *location_obj,
 157                  *statusbar_obj, *menubar_obj, *navigator_obj;
 158
 159         assert(interpreter);
 160         if (!js_module_init_ok) return NULL;
 161
 162         ctx = JS_NewContext(spidermonkey_runtime,
 163                             8192 /* Stack allocation chunk size */);
 164         if (!ctx)
 165                 return NULL;
 166         interpreter->backend_data = ctx;
 167         JS_SetContextPrivate(ctx, interpreter);
 168         /* TODO: Make JSOPTION_STRICT and JSOPTION_WERROR configurable. */
 169 #ifndef JSOPTION_COMPILE_N_GO
 170 #define JSOPTION_COMPILE_N_GO 0 /* Older SM versions don't have it. */
 171 #endif
 172         /* XXX: JSOPTION_COMPILE_N_GO will go (will it?) when we implement
 173          * some kind of bytecode cache. (If we will ever do that.) */
 174         JS_SetOptions(ctx, JSOPTION_VAROBJFIX | JSOPTION_COMPILE_N_GO);
 175
 176         window_obj = JS_NewObject(ctx, (JSClass *) &window_class, NULL, NULL);
 177         if (!window_obj) {
 178                 spidermonkey_put_interpreter(interpreter);
 179                 return NULL;
 180         }
 181         JS_InitStandardClasses(ctx, window_obj);
 182         JS_DefineProperties(ctx, window_obj, (JSPropertySpec *) window_props);
 183         spidermonkey_DefineFunctions(ctx, window_obj, window_funcs);
 184         JS_SetPrivate(ctx, window_obj, interpreter->vs); /* to @window_class */
 185
 186         document_obj = spidermonkey_InitClass(ctx, window_obj, NULL,
 187                                               (JSClass *) &document_class, NULL, 0,
 188                                               (JSPropertySpec *) document_props,
 189                                               document_funcs,
 190                                               NULL, NULL);
 191
 192         forms_obj = spidermonkey_InitClass(ctx, document_obj, NULL,
 193                                            (JSClass *) &forms_class, NULL, 0,
 194                                            (JSPropertySpec *) forms_props,
 195                                            forms_funcs,
 196                                            NULL, NULL);
 197
 198         history_obj = spidermonkey_InitClass(ctx, window_obj, NULL,
 199                                              (JSClass *) &history_class, NULL, 0,
 200                                              (JSPropertySpec *) NULL,
 201                                              history_funcs,
 202                                              NULL, NULL);
 203
 204         location_obj = spidermonkey_InitClass(ctx, window_obj, NULL,
 205                                               (JSClass *) &location_class, NULL, 0,
 206                                               (JSPropertySpec *) location_props,
 207                                               location_funcs,
 208                                               NULL, NULL);
 209
 210         menubar_obj = JS_InitClass(ctx, window_obj, NULL,
 211                                    (JSClass *) &menubar_class, NULL, 0,
 212                                    (JSPropertySpec *) unibar_props, NULL,
 213                                    NULL, NULL);
 214         JS_SetPrivate(ctx, menubar_obj, "t"); /* to @menubar_class */
 215
 216         statusbar_obj = JS_InitClass(ctx, window_obj, NULL,
 217                                      (JSClass *) &statusbar_class, NULL, 0,
 218                                      (JSPropertySpec *) unibar_props, NULL,
 219                                      NULL, NULL);
 220         JS_SetPrivate(ctx, statusbar_obj, "s"); /* to @statusbar_class */
 221
 222         navigator_obj = JS_InitClass(ctx, window_obj, NULL,
 223                                      (JSClass *) &navigator_class, NULL, 0,
 224                                      (JSPropertySpec *) navigator_props, NULL,
 225                                      NULL, NULL);
 226
 227         return ctx;
 228 }
 229
 230 void
 231 spidermonkey_put_interpreter(struct ecmascript_interpreter *interpreter)
 232 {
 233         JSContext *ctx;
 234
 235         assert(interpreter);
 236         if (!js_module_init_ok) return;
 237         ctx = interpreter->backend_data;
 238         JS_DestroyContext(ctx);
 239         interpreter->backend_data = NULL;
 240 }
 241
 242
 243 void
 244 spidermonkey_eval(struct ecmascript_interpreter *interpreter,
 245                   struct string *code, struct string *ret)
 246 {
 247         JSContext *ctx;
 248         jsval rval;
 249
 250         assert(interpreter);
 251         if (!js_module_init_ok) return;
 252         ctx = interpreter->backend_data;
 253         setup_safeguard(interpreter, ctx);
 254         interpreter->ret = ret;
 255         JS_EvaluateScript(ctx, JS_GetGlobalObject(ctx),
 256                           code->source, code->length, "", 0, &rval);
 257 }
 258
 259
 260 unsigned char *
 261 spidermonkey_eval_stringback(struct ecmascript_interpreter *interpreter,
 262                              struct string *code)
 263 {
 264         JSContext *ctx;
 265         jsval rval;
 266
 267         assert(interpreter);
 268         if (!js_module_init_ok) return NULL;
 269         ctx = interpreter->backend_data;
 270         setup_safeguard(interpreter, ctx);
 271         interpreter->ret = NULL;
 272         if (JS_EvaluateScript(ctx, JS_GetGlobalObject(ctx),
 273                               code->source, code->length, "", 0, &rval)
 274             == JS_FALSE) {
 275                 return NULL;
 276         }
 277         if (JSVAL_IS_VOID(rval)) {
 278                 /* Undefined value. */
 279                 return NULL;
 280         }
 281
 282         return stracpy(jsval_to_string(ctx, &rval));
 283 }
 284
 285
 286 int
 287 spidermonkey_eval_boolback(struct ecmascript_interpreter *interpreter,
 288                            struct string *code)
 289 {
 290         JSContext *ctx;
 291         JSFunction *fun;
 292         jsval rval;
 293         int ret;
 294
 295         assert(interpreter);
 296         if (!js_module_init_ok) return 0;
 297         ctx = interpreter->backend_data;
 298         setup_safeguard(interpreter, ctx);
 299         interpreter->ret = NULL;
 300         fun = JS_CompileFunction(ctx, NULL, "", 0, NULL, code->source,
 301                                  code->length, "", 0);
 302         if (!fun)
 303                 return -1;
 304
 305         ret = JS_CallFunction(ctx, NULL, fun, 0, NULL, &rval);
 306         if (ret == 2) { /* onClick="history.back()" */
 307                 return 0;
 308         }
 309         if (ret == JS_FALSE) {
 310                 return -1;
 311         }
 312         if (JSVAL_IS_VOID(rval)) {
 313                 /* Undefined value. */
 314                 return -1;
 315         }
 316
 317         return jsval_to_boolean(ctx, &rval);
 318 }
 319
 320 struct module spidermonkey_module = struct_module(
 321         /* name: */             N_("SpiderMonkey"),
 322         /* options: */          NULL,
 323         /* events: */           NULL,
 324         /* submodules: */       NULL,
 325         /* data: */             NULL,
 326         /* init: */             spidermonkey_init,
 327         /* done: */             spidermonkey_done
 328 );