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 terminal *term;
  65         unsigned char *strict, *exception, *warning, *error;
  66         struct string msg;
  67
  68         assert(interpreter && interpreter->vs && interpreter->vs->doc_view
  69                && interpreter->vs->doc_view->session
  70                && interpreter->vs->doc_view->session->tab);
  71         if_assert_failed goto reported;
  72
  73         term = interpreter->vs->doc_view->session->tab->term;
  74
  75 #ifdef CONFIG_LEDS
  76         set_led_value(interpreter->vs->doc_view->session->status.ecmascript_led, 'J');
  77 #endif
  78
  79         if (!get_opt_bool("ecmascript.error_reporting")
  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         int max_exec_time = get_opt_int("ecmascript.max_exec_time");
 117
 118         if (time(NULL) - interpreter->exec_start > max_exec_time) {
 119                 struct terminal *term = interpreter->vs->doc_view->session->tab->term;
 120
 121                 /* A killer script! Alert! */
 122                 ecmascript_timeout_dialog(term, max_exec_time);
 123                 return JS_FALSE;
 124         }
 125         return JS_TRUE;
 126 }
 127
 128 static void
 129 setup_safeguard(struct ecmascript_interpreter *interpreter,
 130                 JSContext *ctx)
 131 {
 132         interpreter->exec_start = time(NULL);
 133         JS_SetBranchCallback(ctx, safeguard);
 134 }
 135
 136
 137 static void
 138 spidermonkey_init(struct module *xxx)
 139 {
 140         js_module_init_ok = spidermonkey_runtime_addref();
 141 }
 142
 143 static void
 144 spidermonkey_done(struct module *xxx)
 145 {
 146         if (js_module_init_ok)
 147                 spidermonkey_runtime_release();
 148 }
 149
 150
 151 void *
 152 spidermonkey_get_interpreter(struct ecmascript_interpreter *interpreter)
 153 {
 154         JSContext *ctx;
 155         JSObject *window_obj, *document_obj, *forms_obj, *history_obj, *location_obj,
 156                  *statusbar_obj, *menubar_obj, *navigator_obj;
 157
 158         assert(interpreter);
 159         if (!js_module_init_ok) return NULL;
 160
 161         ctx = JS_NewContext(spidermonkey_runtime,
 162                             8192 /* Stack allocation chunk size */);
 163         if (!ctx)
 164                 return NULL;
 165         interpreter->backend_data = ctx;
 166         JS_SetContextPrivate(ctx, interpreter);
 167         /* TODO: Make JSOPTION_STRICT and JSOPTION_WERROR configurable. */
 168 #ifndef JSOPTION_COMPILE_N_GO
 169 #define JSOPTION_COMPILE_N_GO 0 /* Older SM versions don't have it. */
 170 #endif
 171         /* XXX: JSOPTION_COMPILE_N_GO will go (will it?) when we implement
 172          * some kind of bytecode cache. (If we will ever do that.) */
 173         JS_SetOptions(ctx, JSOPTION_VAROBJFIX | JSOPTION_COMPILE_N_GO);
 174
 175         window_obj = JS_NewObject(ctx, (JSClass *) &window_class, NULL, NULL);
 176         if (!window_obj) {
 177                 spidermonkey_put_interpreter(interpreter);
 178                 return NULL;
 179         }
 180         JS_InitStandardClasses(ctx, window_obj);
 181         JS_DefineProperties(ctx, window_obj, (JSPropertySpec *) window_props);
 182         spidermonkey_DefineFunctions(ctx, window_obj, window_funcs);
 183         JS_SetPrivate(ctx, window_obj, interpreter->vs); /* to @window_class */
 184
 185         document_obj = spidermonkey_InitClass(ctx, window_obj, NULL,
 186                                               (JSClass *) &document_class, NULL, 0,
 187                                               (JSPropertySpec *) document_props,
 188                                               document_funcs,
 189                                               NULL, NULL);
 190
 191         forms_obj = spidermonkey_InitClass(ctx, document_obj, NULL,
 192                                            (JSClass *) &forms_class, NULL, 0,
 193                                            (JSPropertySpec *) forms_props,
 194                                            forms_funcs,
 195                                            NULL, NULL);
 196
 197         history_obj = spidermonkey_InitClass(ctx, window_obj, NULL,
 198                                              (JSClass *) &history_class, NULL, 0,
 199                                              (JSPropertySpec *) NULL,
 200                                              history_funcs,
 201                                              NULL, NULL);
 202
 203         location_obj = spidermonkey_InitClass(ctx, window_obj, NULL,
 204                                               (JSClass *) &location_class, NULL, 0,
 205                                               (JSPropertySpec *) location_props,
 206                                               location_funcs,
 207                                               NULL, NULL);
 208
 209         menubar_obj = JS_InitClass(ctx, window_obj, NULL,
 210                                    (JSClass *) &menubar_class, NULL, 0,
 211                                    (JSPropertySpec *) unibar_props, NULL,
 212                                    NULL, NULL);
 213         JS_SetPrivate(ctx, menubar_obj, "t"); /* to @menubar_class */
 214
 215         statusbar_obj = JS_InitClass(ctx, window_obj, NULL,
 216                                      (JSClass *) &statusbar_class, NULL, 0,
 217                                      (JSPropertySpec *) unibar_props, NULL,
 218                                      NULL, NULL);
 219         JS_SetPrivate(ctx, statusbar_obj, "s"); /* to @statusbar_class */
 220
 221         navigator_obj = JS_InitClass(ctx, window_obj, NULL,
 222                                      (JSClass *) &navigator_class, NULL, 0,
 223                                      (JSPropertySpec *) navigator_props, NULL,
 224                                      NULL, NULL);
 225
 226         return ctx;
 227 }
 228
 229 void
 230 spidermonkey_put_interpreter(struct ecmascript_interpreter *interpreter)
 231 {
 232         JSContext *ctx;
 233
 234         assert(interpreter);
 235         if (!js_module_init_ok) return;
 236         ctx = interpreter->backend_data;
 237         JS_DestroyContext(ctx);
 238         interpreter->backend_data = NULL;
 239 }
 240
 241
 242 void
 243 spidermonkey_eval(struct ecmascript_interpreter *interpreter,
 244                   struct string *code, struct string *ret)
 245 {
 246         JSContext *ctx;
 247         jsval rval;
 248
 249         assert(interpreter);
 250         if (!js_module_init_ok) return;
 251         ctx = interpreter->backend_data;
 252         setup_safeguard(interpreter, ctx);
 253         interpreter->ret = ret;
 254         JS_EvaluateScript(ctx, JS_GetGlobalObject(ctx),
 255                           code->source, code->length, "", 0, &rval);
 256 }
 257
 258
 259 unsigned char *
 260 spidermonkey_eval_stringback(struct ecmascript_interpreter *interpreter,
 261                              struct string *code)
 262 {
 263         JSContext *ctx;
 264         jsval rval;
 265
 266         assert(interpreter);
 267         if (!js_module_init_ok) return NULL;
 268         ctx = interpreter->backend_data;
 269         setup_safeguard(interpreter, ctx);
 270         interpreter->ret = NULL;
 271         if (JS_EvaluateScript(ctx, JS_GetGlobalObject(ctx),
 272                               code->source, code->length, "", 0, &rval)
 273             == JS_FALSE) {
 274                 return NULL;
 275         }
 276         if (JSVAL_IS_VOID(rval)) {
 277                 /* Undefined value. */
 278                 return NULL;
 279         }
 280
 281         return stracpy(jsval_to_string(ctx, &rval));
 282 }
 283
 284
 285 int
 286 spidermonkey_eval_boolback(struct ecmascript_interpreter *interpreter,
 287                            struct string *code)
 288 {
 289         JSContext *ctx;
 290         JSFunction *fun;
 291         jsval rval;
 292         int ret;
 293
 294         assert(interpreter);
 295         if (!js_module_init_ok) return 0;
 296         ctx = interpreter->backend_data;
 297         setup_safeguard(interpreter, ctx);
 298         interpreter->ret = NULL;
 299         fun = JS_CompileFunction(ctx, NULL, "", 0, NULL, code->source,
 300                                  code->length, "", 0);
 301         if (!fun)
 302                 return -1;
 303
 304         ret = JS_CallFunction(ctx, NULL, fun, 0, NULL, &rval);
 305         if (ret == 2) { /* onClick="history.back()" */
 306                 return 0;
 307         }
 308         if (ret == JS_FALSE) {
 309                 return -1;
 310         }
 311         if (JSVAL_IS_VOID(rval)) {
 312                 /* Undefined value. */
 313                 return -1;
 314         }
 315
 316         return jsval_to_boolean(ctx, &rval);
 317 }
 318
 319 struct module spidermonkey_module = struct_module(
 320         /* name: */             N_("SpiderMonkey"),
 321         /* options: */          NULL,
 322         /* events: */           NULL,
 323         /* submodules: */       NULL,
 324         /* data: */             NULL,
 325         /* init: */             spidermonkey_init,
 326         /* done: */             spidermonkey_done
 327 );