js/src/jsbool.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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  16  * The Original Code is Mozilla Communicator client code, released
  17  * March 31, 1998.
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  39
  40 /*
  41  * JS boolean implementation.
  42  */
  43 #include "jstypes.h"
  44 #include "jsstdint.h"
  45 #include "jsutil.h"
  46 #include "jsapi.h"
  47 #include "jsatom.h"
  48 #include "jsbool.h"
  49 #include "jscntxt.h"
  50 #include "jsversion.h"
  51 #include "jslock.h"
  52 #include "jsnum.h"
  53 #include "jsobj.h"
  54 #include "jsstr.h"
  55 #include "jsvector.h"
  56
  57 #include "jsinterpinlines.h"
  58 #include "jsobjinlines.h"
  59
  60 using namespace js;
  61
  62 Class js_BooleanClass = {
  63     "Boolean",
  64     JSCLASS_HAS_RESERVED_SLOTS(1) |
  65     JSCLASS_HAS_CACHED_PROTO(JSProto_Boolean),
  66     PropertyStub,         /* addProperty */
  67     PropertyStub,         /* delProperty */
  68     PropertyStub,         /* getProperty */
  69     StrictPropertyStub,   /* setProperty */
  70     EnumerateStub,
  71     ResolveStub,
  72     ConvertStub
  73 };
  74
  75 #if JS_HAS_TOSOURCE
  76 #include "jsprf.h"
  77
  78 static JSBool
  79 bool_toSource(JSContext *cx, uintN argc, Value *vp)
  80 {
  81     bool b;
  82     if (!GetPrimitiveThis(cx, vp, &b))
  83         return false;
  84
  85     char buf[32];
  86     JS_snprintf(buf, sizeof buf, "(new Boolean(%s))", JS_BOOLEAN_STR(b));
  87     JSString *str = JS_NewStringCopyZ(cx, buf);
  88     if (!str)
  89         return false;
  90     vp->setString(str);
  91     return true;
  92 }
  93 #endif
  94
  95 static JSBool
  96 bool_toString(JSContext *cx, uintN argc, Value *vp)
  97 {
  98     bool b;
  99     if (!GetPrimitiveThis(cx, vp, &b))
 100         return false;
 101
 102     JSAtom *atom = cx->runtime->atomState.booleanAtoms[b ? 1 : 0];
 103     JSString *str = ATOM_TO_STRING(atom);
 104     if (!str)
 105         return JS_FALSE;
 106     vp->setString(str);
 107     return JS_TRUE;
 108 }
 109
 110 static JSBool
 111 bool_valueOf(JSContext *cx, uintN argc, Value *vp)
 112 {
 113     bool b;
 114     if (!GetPrimitiveThis(cx, vp, &b))
 115         return false;
 116
 117     vp->setBoolean(b);
 118     return JS_TRUE;
 119 }
 120
 121 static JSFunctionSpec boolean_methods[] = {
 122 #if JS_HAS_TOSOURCE
 123     JS_FN(js_toSource_str,  bool_toSource,  0, 0),
 124 #endif
 125     JS_FN(js_toString_str,  bool_toString,  0, 0),
 126     JS_FN(js_valueOf_str,   bool_valueOf,   0, 0),
 127     JS_FN(js_toJSON_str,    bool_valueOf,   0, 0),
 128     JS_FS_END
 129 };
 130
 131 static JSBool
 132 Boolean(JSContext *cx, uintN argc, Value *vp)
 133 {
 134     Value *argv = vp + 2;
 135     bool b = argc != 0 ? js_ValueToBoolean(argv[0]) : false;
 136
 137     if (IsConstructing(vp)) {
 138         JSObject *obj = NewBuiltinClassInstance(cx, &js_BooleanClass);
 139         if (!obj)
 140             return false;
 141         obj->setPrimitiveThis(BooleanValue(b));
 142         vp->setObject(*obj);
 143     } else {
 144         vp->setBoolean(b);
 145     }
 146     return true;
 147 }
 148
 149 JSObject *
 150 js_InitBooleanClass(JSContext *cx, JSObject *obj)
 151 {
 152     JSObject *proto;
 153
 154     proto = js_InitClass(cx, obj, NULL, &js_BooleanClass, Boolean, 1,
 155                          NULL, boolean_methods, NULL, NULL);
 156     if (!proto)
 157         return NULL;
 158     proto->setPrimitiveThis(BooleanValue(false));
 159     return proto;
 160 }
 161
 162 JSString *
 163 js_BooleanToString(JSContext *cx, JSBool b)
 164 {
 165     return ATOM_TO_STRING(cx->runtime->atomState.booleanAtoms[b ? 1 : 0]);
 166 }
 167
 168 /* This function implements E-262-3 section 9.8, toString. */
 169 bool
 170 js::BooleanToStringBuffer(JSContext *cx, JSBool b, StringBuffer &sb)
 171 {
 172     return b ? sb.append("true") : sb.append("false");
 173 }
 174
 175 JSBool
 176 js_ValueToBoolean(const Value &v)
 177 {
 178     if (v.isInt32())
 179         return v.toInt32() != 0;
 180     if (v.isString())
 181         return v.toString()->length() != 0;
 182     if (v.isObject())
 183         return JS_TRUE;
 184     if (v.isNullOrUndefined())
 185         return JS_FALSE;
 186     if (v.isDouble()) {
 187         jsdouble d;
 188
 189         d = v.toDouble();
 190         return !JSDOUBLE_IS_NaN(d) && d != 0;
 191     }
 192     JS_ASSERT(v.isBoolean());
 193     return v.toBoolean();
 194 }