API/JSValueRef.cpp

   1 /*
   2  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "JSValueRef.h"
  28
  29 #include <wtf/Platform.h>
  30 #include "APICast.h"
  31 #include "JSCallbackObject.h"
  32
  33 #include <runtime/JSGlobalObject.h>
  34 #include <runtime/JSString.h>
  35 #include <runtime/Operations.h>
  36 #include <runtime/Protect.h>
  37 #include <runtime/UString.h>
  38 #include <runtime/JSValue.h>
  39
  40 #include <wtf/Assertions.h>
  41
  42 #include <algorithm> // for std::min
  43
  44 JSType JSValueGetType(JSContextRef, JSValueRef value)
  45 {
  46     JSC::JSValuePtr jsValue = toJS(value);
  47     if (jsValue.isUndefined())
  48         return kJSTypeUndefined;
  49     if (jsValue.isNull())
  50         return kJSTypeNull;
  51     if (jsValue.isBoolean())
  52         return kJSTypeBoolean;
  53     if (jsValue.isNumber())
  54         return kJSTypeNumber;
  55     if (jsValue.isString())
  56         return kJSTypeString;
  57     ASSERT(jsValue.isObject());
  58     return kJSTypeObject;
  59 }
  60
  61 using namespace JSC; // placed here to avoid conflict between JSC::JSType and JSType, above.
  62
  63 bool JSValueIsUndefined(JSContextRef, JSValueRef value)
  64 {
  65     JSValuePtr jsValue = toJS(value);
  66     return jsValue.isUndefined();
  67 }
  68
  69 bool JSValueIsNull(JSContextRef, JSValueRef value)
  70 {
  71     JSValuePtr jsValue = toJS(value);
  72     return jsValue.isNull();
  73 }
  74
  75 bool JSValueIsBoolean(JSContextRef, JSValueRef value)
  76 {
  77     JSValuePtr jsValue = toJS(value);
  78     return jsValue.isBoolean();
  79 }
  80
  81 bool JSValueIsNumber(JSContextRef, JSValueRef value)
  82 {
  83     JSValuePtr jsValue = toJS(value);
  84     return jsValue.isNumber();
  85 }
  86
  87 bool JSValueIsString(JSContextRef, JSValueRef value)
  88 {
  89     JSValuePtr jsValue = toJS(value);
  90     return jsValue.isString();
  91 }
  92
  93 bool JSValueIsObject(JSContextRef, JSValueRef value)
  94 {
  95     JSValuePtr jsValue = toJS(value);
  96     return jsValue.isObject();
  97 }
  98
  99 bool JSValueIsObjectOfClass(JSContextRef, JSValueRef value, JSClassRef jsClass)
 100 {
 101     JSValuePtr jsValue = toJS(value);
 102
 103     if (JSObject* o = jsValue.getObject()) {
 104         if (o->inherits(&JSCallbackObject<JSGlobalObject>::info))
 105             return static_cast<JSCallbackObject<JSGlobalObject>*>(o)->inherits(jsClass);
 106         else if (o->inherits(&JSCallbackObject<JSObject>::info))
 107             return static_cast<JSCallbackObject<JSObject>*>(o)->inherits(jsClass);
 108     }
 109     return false;
 110 }
 111
 112 bool JSValueIsEqual(JSContextRef ctx, JSValueRef a, JSValueRef b, JSValueRef* exception)
 113 {
 114     ExecState* exec = toJS(ctx);
 115     exec->globalData().heap.registerThread();
 116     JSLock lock(exec);
 117
 118     JSValuePtr jsA = toJS(a);
 119     JSValuePtr jsB = toJS(b);
 120
 121     bool result = JSValuePtr::equal(exec, jsA, jsB); // false if an exception is thrown
 122     if (exec->hadException()) {
 123         if (exception)
 124             *exception = toRef(exec->exception());
 125         exec->clearException();
 126     }
 127     return result;
 128 }
 129
 130 bool JSValueIsStrictEqual(JSContextRef, JSValueRef a, JSValueRef b)
 131 {
 132     JSValuePtr jsA = toJS(a);
 133     JSValuePtr jsB = toJS(b);
 134
 135     bool result = JSValuePtr::strictEqual(jsA, jsB);
 136     return result;
 137 }
 138
 139 bool JSValueIsInstanceOfConstructor(JSContextRef ctx, JSValueRef value, JSObjectRef constructor, JSValueRef* exception)
 140 {
 141     ExecState* exec = toJS(ctx);
 142     exec->globalData().heap.registerThread();
 143     JSLock lock(exec);
 144
 145     JSValuePtr jsValue = toJS(value);
 146     JSObject* jsConstructor = toJS(constructor);
 147     if (!jsConstructor->structure()->typeInfo().implementsHasInstance())
 148         return false;
 149     bool result = jsConstructor->hasInstance(exec, jsValue, jsConstructor->get(exec, exec->propertyNames().prototype)); // false if an exception is thrown
 150     if (exec->hadException()) {
 151         if (exception)
 152             *exception = toRef(exec->exception());
 153         exec->clearException();
 154     }
 155     return result;
 156 }
 157
 158 JSValueRef JSValueMakeUndefined(JSContextRef)
 159 {
 160     return toRef(jsUndefined());
 161 }
 162
 163 JSValueRef JSValueMakeNull(JSContextRef)
 164 {
 165     return toRef(jsNull());
 166 }
 167
 168 JSValueRef JSValueMakeBoolean(JSContextRef, bool value)
 169 {
 170     return toRef(jsBoolean(value));
 171 }
 172
 173 JSValueRef JSValueMakeNumber(JSContextRef ctx, double value)
 174 {
 175     ExecState* exec = toJS(ctx);
 176     exec->globalData().heap.registerThread();
 177     JSLock lock(exec);
 178
 179     return toRef(jsNumber(exec, value));
 180 }
 181
 182 JSValueRef JSValueMakeString(JSContextRef ctx, JSStringRef string)
 183 {
 184     ExecState* exec = toJS(ctx);
 185     exec->globalData().heap.registerThread();
 186     JSLock lock(exec);
 187
 188     return toRef(jsString(exec, string->ustring()));
 189 }
 190
 191 bool JSValueToBoolean(JSContextRef ctx, JSValueRef value)
 192 {
 193     ExecState* exec = toJS(ctx);
 194     JSValuePtr jsValue = toJS(value);
 195     return jsValue.toBoolean(exec);
 196 }
 197
 198 double JSValueToNumber(JSContextRef ctx, JSValueRef value, JSValueRef* exception)
 199 {
 200     ExecState* exec = toJS(ctx);
 201     exec->globalData().heap.registerThread();
 202     JSLock lock(exec);
 203
 204     JSValuePtr jsValue = toJS(value);
 205
 206     double number = jsValue.toNumber(exec);
 207     if (exec->hadException()) {
 208         if (exception)
 209             *exception = toRef(exec->exception());
 210         exec->clearException();
 211         number = NaN;
 212     }
 213     return number;
 214 }
 215
 216 JSStringRef JSValueToStringCopy(JSContextRef ctx, JSValueRef value, JSValueRef* exception)
 217 {
 218     ExecState* exec = toJS(ctx);
 219     exec->globalData().heap.registerThread();
 220     JSLock lock(exec);
 221
 222     JSValuePtr jsValue = toJS(value);
 223
 224     RefPtr<OpaqueJSString> stringRef(OpaqueJSString::create(jsValue.toString(exec)));
 225     if (exec->hadException()) {
 226         if (exception)
 227             *exception = toRef(exec->exception());
 228         exec->clearException();
 229         stringRef.clear();
 230     }
 231     return stringRef.release().releaseRef();
 232 }
 233
 234 JSObjectRef JSValueToObject(JSContextRef ctx, JSValueRef value, JSValueRef* exception)
 235 {
 236     ExecState* exec = toJS(ctx);
 237     exec->globalData().heap.registerThread();
 238     JSLock lock(exec);
 239
 240     JSValuePtr jsValue = toJS(value);
 241
 242     JSObjectRef objectRef = toRef(jsValue.toObject(exec));
 243     if (exec->hadException()) {
 244         if (exception)
 245             *exception = toRef(exec->exception());
 246         exec->clearException();
 247         objectRef = 0;
 248     }
 249     return objectRef;
 250 }
 251
 252 void JSValueProtect(JSContextRef ctx, JSValueRef value)
 253 {
 254     ExecState* exec = toJS(ctx);
 255     exec->globalData().heap.registerThread();
 256     JSLock lock(exec);
 257
 258     JSValuePtr jsValue = toJS(value);
 259     gcProtect(jsValue);
 260 }
 261
 262 void JSValueUnprotect(JSContextRef ctx, JSValueRef value)
 263 {
 264     ExecState* exec = toJS(ctx);
 265     exec->globalData().heap.registerThread();
 266     JSLock lock(exec);
 267
 268     JSValuePtr jsValue = toJS(value);
 269     gcUnprotect(jsValue);
 270 }