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 "jsstddef.h"
  44 #include "jstypes.h"
  45 #include "jsutil.h" /* Added by JSIFY */
  46 #include "jsapi.h"
  47 #include "jsatom.h"
  48 #include "jsbool.h"
  49 #include "jscntxt.h"
  50 #include "jsconfig.h"
  51 #include "jsinterp.h"
  52 #include "jslock.h"
  53 #include "jsnum.h"
  54 #include "jsobj.h"
  55 #include "jsstr.h"
  56
  57 /* Check pseudo-booleans values. */
  58 JS_STATIC_ASSERT(JSVAL_VOID == JSVAL_TRUE + JSVAL_ALIGN);
  59 JS_STATIC_ASSERT(JSVAL_HOLE == JSVAL_VOID + JSVAL_ALIGN);
  60 JS_STATIC_ASSERT(JSVAL_ARETURN == JSVAL_HOLE + JSVAL_ALIGN);
  61
  62 JSClass js_BooleanClass = {
  63     "Boolean",
  64     JSCLASS_HAS_PRIVATE | JSCLASS_HAS_CACHED_PROTO(JSProto_Boolean),
  65     JS_PropertyStub,  JS_PropertyStub,  JS_PropertyStub,  JS_PropertyStub,
  66     JS_EnumerateStub, JS_ResolveStub,   JS_ConvertStub,   JS_FinalizeStub,
  67     JSCLASS_NO_OPTIONAL_MEMBERS
  68 };
  69
  70 #if JS_HAS_TOSOURCE
  71 #include "jsprf.h"
  72
  73 static JSBool
  74 bool_toSource(JSContext *cx, uintN argc, jsval *vp)
  75 {
  76     jsval v;
  77     char buf[32];
  78     JSString *str;
  79
  80     if (!js_GetPrimitiveThis(cx, vp, &js_BooleanClass, &v))
  81         return JS_FALSE;
  82     JS_ASSERT(JSVAL_IS_BOOLEAN(v));
  83     JS_snprintf(buf, sizeof buf, "(new %s(%s))",
  84                 js_BooleanClass.name,
  85                 JS_BOOLEAN_STR(JSVAL_TO_BOOLEAN(v)));
  86     str = JS_NewStringCopyZ(cx, buf);
  87     if (!str)
  88         return JS_FALSE;
  89     *vp = STRING_TO_JSVAL(str);
  90     return JS_TRUE;
  91 }
  92 #endif
  93
  94 static JSBool
  95 bool_toString(JSContext *cx, uintN argc, jsval *vp)
  96 {
  97     jsval v;
  98     JSAtom *atom;
  99     JSString *str;
 100
 101     if (!js_GetPrimitiveThis(cx, vp, &js_BooleanClass, &v))
 102         return JS_FALSE;
 103     JS_ASSERT(JSVAL_IS_BOOLEAN(v));
 104     atom = cx->runtime->atomState.booleanAtoms[JSVAL_TO_BOOLEAN(v) ? 1 : 0];
 105     str = ATOM_TO_STRING(atom);
 106     if (!str)
 107         return JS_FALSE;
 108     *vp = STRING_TO_JSVAL(str);
 109     return JS_TRUE;
 110 }
 111
 112 static JSBool
 113 bool_valueOf(JSContext *cx, uintN argc, jsval *vp)
 114 {
 115     return js_GetPrimitiveThis(cx, vp, &js_BooleanClass, vp);
 116 }
 117
 118 static JSFunctionSpec boolean_methods[] = {
 119 #if JS_HAS_TOSOURCE
 120     JS_FN(js_toSource_str,  bool_toSource,  0, JSFUN_THISP_BOOLEAN),
 121 #endif
 122     JS_FN(js_toString_str,  bool_toString,  0, JSFUN_THISP_BOOLEAN),
 123     JS_FN(js_valueOf_str,   bool_valueOf,   0, JSFUN_THISP_BOOLEAN),
 124     JS_FS_END
 125 };
 126
 127 static JSBool
 128 Boolean(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
 129 {
 130     jsval bval;
 131
 132     bval = (argc != 0)
 133            ? BOOLEAN_TO_JSVAL(js_ValueToBoolean(argv[0]))
 134            : JSVAL_FALSE;
 135     if (!(cx->fp->flags & JSFRAME_CONSTRUCTING)) {
 136         *rval = bval;
 137         return JS_TRUE;
 138     }
 139     STOBJ_SET_SLOT(obj, JSSLOT_PRIVATE, bval);
 140     return JS_TRUE;
 141 }
 142
 143 JSObject *
 144 js_InitBooleanClass(JSContext *cx, JSObject *obj)
 145 {
 146     JSObject *proto;
 147
 148     proto = JS_InitClass(cx, obj, NULL, &js_BooleanClass, Boolean, 1,
 149                         NULL, boolean_methods, NULL, NULL);
 150     if (!proto)
 151         return NULL;
 152     STOBJ_SET_SLOT(proto, JSSLOT_PRIVATE, JSVAL_FALSE);
 153     return proto;
 154 }
 155
 156 JSString *
 157 js_BooleanToString(JSContext *cx, JSBool b)
 158 {
 159     return ATOM_TO_STRING(cx->runtime->atomState.booleanAtoms[b ? 1 : 0]);
 160 }
 161
 162 JSBool
 163 js_ValueToBoolean(jsval v)
 164 {
 165     if (JSVAL_IS_NULL(v) || JSVAL_IS_VOID(v))
 166         return JS_FALSE;
 167     if (JSVAL_IS_OBJECT(v))
 168         return JS_TRUE;
 169     if (JSVAL_IS_STRING(v))
 170         return JSSTRING_LENGTH(JSVAL_TO_STRING(v)) != 0;
 171     if (JSVAL_IS_INT(v))
 172         return JSVAL_TO_INT(v) != 0;
 173     if (JSVAL_IS_DOUBLE(v)) {
 174         jsdouble d;
 175
 176         d = *JSVAL_TO_DOUBLE(v);
 177         return !JSDOUBLE_IS_NaN(d) && d != 0;
 178     }
 179     JS_ASSERT(JSVAL_IS_BOOLEAN(v));
 180     return JSVAL_TO_BOOLEAN(v);
 181 }