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- /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
- *
- * The contents of this file are subject to the Netscape Public License
- * Version 1.0 (the "NPL"); you may not use this file except in
- * compliance with the NPL. You may obtain a copy of the NPL at
- * http://www.mozilla.org/NPL/
- *
- * Software distributed under the NPL is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
- * for the specific language governing rights and limitations under the
- * NPL.
- *
- * The Initial Developer of this code under the NPL is Netscape
- * Communications Corporation. Portions created by Netscape are
- * Copyright (C) 1998 Netscape Communications Corporation. All Rights
- * Reserved.
- */
-
- /*
- * JS number type and wrapper class.
- */
- #include <errno.h>
- #ifdef XP_PC
- #include <float.h>
- #endif
- #include <math.h>
- #include <stdlib.h>
- #include <string.h>
- #include "prtypes.h"
- #include "prdtoa.h"
- #include "prprf.h"
- #include "jsapi.h"
- #include "jsatom.h"
- #include "jscntxt.h"
- #include "jsconfig.h"
- #include "jsgc.h"
- #include "jslock.h"
- #include "jsnum.h"
- #include "jsobj.h"
- #include "jsopcode.h"
- #include "jsstr.h"
-
- union dpun {
- struct {
- #ifdef IS_LITTLE_ENDIAN
- uint32 lo, hi;
- #else
- uint32 hi, lo;
- #endif
- } s;
- jsdouble d;
- };
-
- static JSBool
- num_isNaN(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
- {
- jsdouble x;
-
- if (!JS_ValueToNumber(cx, argv[0], &x))
- return JS_FALSE;
- *rval = BOOLEAN_TO_JSVAL(JSDOUBLE_IS_NaN(x));
- return JS_TRUE;
- }
-
- static JSBool
- num_isFinite(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
- {
- jsdouble x;
-
- if (!JS_ValueToNumber(cx, argv[0], &x))
- return JS_FALSE;
- *rval = BOOLEAN_TO_JSVAL(JSDOUBLE_IS_FINITE(x));
- return JS_TRUE;
- }
-
- static JSBool
- num_parseFloat(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
- jsval *rval)
- {
- JSString *str;
- jsdouble d, *dp;
- jschar *ep;
-
- str = JS_ValueToString(cx, argv[0]);
- if (!str)
- return JS_FALSE;
- if (!js_strtod(str->chars, &ep, &d) || ep == str->chars) {
- *rval = DOUBLE_TO_JSVAL(cx->runtime->jsNaN);
- } else {
- dp = js_NewDouble(cx, d);
- if (!dp)
- return JS_FALSE;
- *rval = DOUBLE_TO_JSVAL(dp);
- }
- return JS_TRUE;
- }
-
- static JSBool
- num_parseInt(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
- {
- JSString *str;
- jsdouble d;
- jsint radix;
- jschar *ep;
-
- str = JS_ValueToString(cx, argv[0]);
- if (!str)
- return JS_FALSE;
- if (argc > 1) {
- if (!JS_ValueToNumber(cx, argv[1], &d))
- return JS_FALSE;
- radix = (jsint)d;
- } else {
- radix = 0;
- }
- if (!js_strtol(str->chars, &ep, radix, &d)) {
- *rval = DOUBLE_TO_JSVAL(cx->runtime->jsNaN);
- } else {
- if (!js_NewNumberValue(cx, d, rval))
- return JS_FALSE;
- }
- return JS_TRUE;
- }
-
- static JSFunctionSpec number_functions[] = {
- {"isNaN", num_isNaN, 1},
- {"isFinite", num_isFinite, 1},
- {"parseFloat", num_parseFloat, 1},
- {"parseInt", num_parseInt, 2},
- {0}
- };
-
- static JSClass number_class = {
- "Number",
- JSCLASS_HAS_PRIVATE,
- JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
- JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, JS_FinalizeStub
- };
-
- static JSBool
- Number(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
- {
- jsdouble d;
- jsval v;
-
- if (argc != 0) {
- if (!JS_ValueToNumber(cx, argv[0], &d))
- return JS_FALSE;
- } else {
- d = 0.0;
- }
- if (!js_NewNumberValue(cx, d, &v))
- return JS_FALSE;
- if (obj->map->clasp != &number_class) {
- *rval = v;
- return JS_TRUE;
- }
- if (!js_SetSlot(cx, obj, JSSLOT_PRIVATE, v))
- return JS_FALSE;
- *rval = OBJECT_TO_JSVAL(obj);
- return JS_TRUE;
- }
-
- static JSBool
- num_toString(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
- {
- jsval v;
- jsdouble d, radix;
- jsint base, ival, dval;
- char *bp, buf[32];
- JSString *str;
-
- if (!JS_InstanceOf(cx, obj, &number_class, argv))
- return JS_FALSE;
- JS_LOCK_VOID(cx, v = js_GetSlot(cx, obj, JSSLOT_PRIVATE));
- d = JSVAL_IS_INT(v) ? (jsdouble)JSVAL_TO_INT(v) : *JSVAL_TO_DOUBLE(v);
- if (argc != 0) {
- if (!JS_ValueToNumber(cx, argv[0], &radix))
- return JS_FALSE;
- base = (jsint)radix;
- if (base < 2 || base > 36) {
- JS_ReportError(cx, "illegal radix %d", base);
- return JS_FALSE;
- }
- ival = (jsint) d;
- bp = buf + sizeof buf;
- for (*--bp = '\0'; ival != 0 && --bp >= buf; ival /= base) {
- dval = ival % base;
- *bp = (char)((dval >= 10) ? 'a' - 10 + dval : '0' + dval);
- }
- if (*bp == '\0')
- *--bp = '0';
- str = JS_NewStringCopyZ(cx, bp);
- } else {
- str = js_NumberToString(cx, d);
- }
- if (!str)
- return JS_FALSE;
- *rval = STRING_TO_JSVAL(str);
- return JS_TRUE;
- }
-
- static JSBool
- num_valueOf(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
- {
- if (!JS_InstanceOf(cx, obj, &number_class, argv))
- return JS_FALSE;
- JS_LOCK_VOID(cx, *rval = js_GetSlot(cx, obj, JSSLOT_PRIVATE));
- return JS_TRUE;
- }
-
- static JSFunctionSpec number_methods[] = {
- {js_toString_str, num_toString, 0},
- {js_valueOf_str, num_valueOf, 0},
- {0}
- };
-
- /* NB: Keep this in synch with number_constants[]. */
- enum nc_slot {
- NC_NaN,
- NC_POSITIVE_INFINITY,
- NC_NEGATIVE_INFINITY,
- NC_MAX_VALUE,
- NC_MIN_VALUE,
- NC_LIMIT
- };
-
- /*
- * Some to most C compilers forbid spelling these at compile time, or barf
- * if you try, so all but MAX_VALUE are set at runtime by js_InitNumberClass
- * using union dpun.
- */
- static JSConstDoubleSpec number_constants[] = {
- {0, "NaN"},
- {0, "POSITIVE_INFINITY"},
- {0, "NEGATIVE_INFINITY"},
- {1.7976931348623157E+308, "MAX_VALUE"},
- {0, "MIN_VALUE"},
- {0}
- };
-
- static jsdouble NaN;
-
- JSObject *
- js_InitNumberClass(JSContext *cx, JSObject *obj)
- {
- JSRuntime *rt;
- union dpun u;
- JSObject *proto, *ctor;
-
- rt = cx->runtime;
- if (!rt->jsNaN) {
- #ifdef XP_PC
- #ifdef XP_OS2
- /*DSR071597 - I have no idea what this really does other than mucking with the floating */
- /*point unit, but it does fix a "floating point underflow" exception I am getting, and there*/
- /*is similar code in the Hursley java. Making sure we have the same code in Javascript */
- /*where Netscape was calling control87 on Windows... */
- _control87(MCW_EM+PC_53+RC_NEAR,MCW_EM+MCW_PC+MCW_RC);
- #else
- _control87(MCW_EM, MCW_EM);
- #endif
- #endif
-
- u.s.hi = JSDOUBLE_HI32_EXPMASK | JSDOUBLE_HI32_MANTMASK;
- u.s.lo = 0xffffffff;
- number_constants[NC_NaN].dval = NaN = u.d;
- rt->jsNaN = js_NewDouble(cx, NaN);
- if (!rt->jsNaN || !JS_LockGCThing(cx, rt->jsNaN))
- return NULL;
-
- u.s.hi = JSDOUBLE_HI32_EXPMASK;
- u.s.lo = 0x00000000;
- number_constants[NC_POSITIVE_INFINITY].dval = u.d;
- rt->jsPositiveInfinity = js_NewDouble(cx, u.d);
- if (!rt->jsPositiveInfinity ||
- !JS_LockGCThing(cx, rt->jsPositiveInfinity)) {
- return NULL;
- }
-
- u.s.hi = JSDOUBLE_HI32_SIGNBIT | JSDOUBLE_HI32_EXPMASK;
- u.s.lo = 0x00000000;
- number_constants[NC_NEGATIVE_INFINITY].dval = u.d;
- rt->jsNegativeInfinity = js_NewDouble(cx, u.d);
- if (!rt->jsNegativeInfinity ||
- !JS_LockGCThing(cx, rt->jsNegativeInfinity)) {
- return NULL;
- }
-
- u.s.hi = 0;
- u.s.lo = 1;
- number_constants[NC_MIN_VALUE].dval = u.d;
- }
-
- if (!JS_DefineFunctions(cx, obj, number_functions))
- return NULL;
-
- proto = JS_InitClass(cx, obj, NULL, &number_class, Number, 1,
- NULL, number_methods, NULL, NULL);
- if (!proto || !(ctor = JS_GetConstructor(cx, proto)))
- return NULL;
- if (!js_SetSlot(cx, proto, JSSLOT_PRIVATE, JSVAL_ZERO))
- return NULL;
- if (!JS_DefineConstDoubles(cx, ctor, number_constants))
- return NULL;
-
- /* ECMA 15.1.1.1 */
- if (!JS_DefineProperty(cx, obj, "NaN", DOUBLE_TO_JSVAL(rt->jsNaN),
- NULL, NULL, 0)) {
- return NULL;
- }
-
- /* ECMA 15.1.1.2 */
- if (!JS_DefineProperty(cx, obj, "Infinity",
- DOUBLE_TO_JSVAL(rt->jsPositiveInfinity),
- NULL, NULL, 0)) {
- return NULL;
- }
- return proto;
- }
-
- jsdouble *
- js_NewDouble(JSContext *cx, jsdouble d)
- {
- jsdouble *dp;
-
- dp = js_AllocGCThing(cx, GCX_DOUBLE);
- if (!dp)
- return NULL;
- *dp = d;
- return dp;
- }
-
- void
- js_FinalizeDouble(JSContext *cx, jsdouble *dp)
- {
- *dp = NaN;
- }
-
- JSBool
- js_NewDoubleValue(JSContext *cx, jsdouble d, jsval *rval)
- {
- jsdouble *dp;
-
- dp = js_NewDouble(cx, d);
- if (!dp)
- return JS_FALSE;
- *rval = DOUBLE_TO_JSVAL(dp);
- return JS_TRUE;
- }
-
- JSBool
- js_NewNumberValue(JSContext *cx, jsdouble d, jsval *rval)
- {
- jsint i;
-
- i = (jsint)d;
- if (JSDOUBLE_IS_INT(d, i) && INT_FITS_IN_JSVAL(i)) {
- *rval = INT_TO_JSVAL(i);
- } else {
- if (!js_NewDoubleValue(cx, d, rval))
- return JS_FALSE;
- }
- return JS_TRUE;
- }
-
- JSObject *
- js_NumberToObject(JSContext *cx, jsdouble d)
- {
- JSObject *obj;
- jsval v;
-
- obj = js_NewObject(cx, &number_class, NULL, NULL);
- if (!obj)
- return NULL;
- if (!js_NewNumberValue(cx, d, &v)) {
- cx->newborn[GCX_OBJECT] = NULL;
- return NULL;
- }
- if (!js_SetSlot(cx, obj, JSSLOT_PRIVATE, v)) {
- cx->newborn[GCX_OBJECT] = NULL;
- return NULL;
- }
- return obj;
- }
-
- /* XXXbe rewrite me to be ECMA-based! */
- JSString *
- js_NumberToString(JSContext *cx, jsdouble d)
- {
- jsint i;
- char buf[32];
-
- i = (jsint)d;
- if (JSDOUBLE_IS_INT(d, i)) {
- PR_snprintf(buf, sizeof buf, "%ld", (long)i);
- } else {
- /* XXX lock here because prdtoa.c is not threadsafe yet */
- JS_LOCK_VOID(cx, PR_cnvtf(buf, sizeof buf, 20, d));
- }
- return JS_NewStringCopyZ(cx, buf);
- }
-
- JSBool
- js_ValueToNumber(JSContext *cx, jsval v, jsdouble *dp)
- {
- JSObject *obj;
- JSString *str;
- jschar *ep;
- jsdouble d;
-
- if (JSVAL_IS_OBJECT(v)) {
- obj = JSVAL_TO_OBJECT(v);
- if (!obj) {
- *dp = 0;
- return JS_TRUE;
- }
- if (!obj->map->clasp->convert(cx, obj, JSTYPE_NUMBER, &v))
- return JS_FALSE;
- }
- if (JSVAL_IS_INT(v)) {
- *dp = (jsdouble)JSVAL_TO_INT(v);
- } else if (JSVAL_IS_DOUBLE(v)) {
- *dp = *JSVAL_TO_DOUBLE(v);
- } else if (JSVAL_IS_STRING(v)) {
- str = JSVAL_TO_STRING(v);
- errno = 0;
- if (!js_strtod(str->chars, &ep, &d) || *ep != 0)
- goto badstr;
- *dp = d;
- } else if (JSVAL_IS_BOOLEAN(v)) {
- *dp = JSVAL_TO_BOOLEAN(v) ? 1 : 0;
- } else {
- #if JS_BUG_FALLIBLE_TONUM
- str = js_ValueToSource(cx, v);
- badstr:
- if (str) {
- JS_ReportError(cx, "%s is not a number",
- JS_GetStringBytes(str));
- }
- return JS_FALSE;
- #else
- badstr:
- *dp = *cx->runtime->jsNaN;
- #endif
- }
- return JS_TRUE;
- }
-
- JSBool
- js_ValueToInt32(JSContext *cx, jsval v, int32 *ip)
- {
- jsdouble d;
- JSString *str;
-
- if (!js_ValueToNumber(cx, v, &d))
- return JS_FALSE;
- if (JSDOUBLE_IS_NaN(d) || d <= -2147483649.0 || 2147483648.0 <= d) {
- str = js_ValueToSource(cx, v);
- if (str) {
- JS_ReportError(cx, "can't convert %s to an integer",
- JS_GetStringBytes(str));
- }
- return JS_FALSE;
- }
- *ip = (int32)floor(d + 0.5); /* Round to nearest */
- return JS_TRUE;
- }
-
- JSBool
- js_ValueToUint16(JSContext *cx, jsval v, uint16 *ip)
- {
- jsdouble d;
- jsuint i, m;
- JSBool neg;
-
- if (!js_ValueToNumber(cx, v, &d))
- return JS_FALSE;
- if (d == 0 || !JSDOUBLE_IS_FINITE(d)) {
- *ip = 0;
- return JS_TRUE;
- }
- i = (jsuint)d;
- if ((jsdouble)i == d) {
- *ip = (uint16)i;
- return JS_TRUE;
- }
- neg = (d < 0);
- d = floor(neg ? -d : d);
- d = neg ? -d : d;
- m = PR_BIT(16);
- d = fmod(d, m);
- if (d < 0)
- d += m;
- *ip = (uint16) d;
- return JS_TRUE;
- }
-
- jsdouble
- js_DoubleToInteger(jsdouble d)
- {
- JSBool neg;
-
- if (d == 0)
- return d;
- if (!JSDOUBLE_IS_FINITE(d)) {
- if (JSDOUBLE_IS_NaN(d))
- return 0;
- return d;
- }
- neg = (d < 0);
- d = floor(neg ? -d : d);
- return neg ? -d : d;
- }
-
- /* XXXbe rewrite me! */
- JSBool
- js_strtod(const jschar *s, jschar **ep, jsdouble *dp)
- {
- size_t i, n;
- char *cstr, *estr;
- jsdouble d;
-
- n = js_strlen(s);
- cstr = malloc(n + 1);
- if (!cstr)
- return JS_FALSE;
- for (i = 0; i <= n; i++) {
- if (s[i] >> 8) {
- free(cstr);
- return JS_FALSE;
- }
- cstr[i] = (char)s[i];
- }
- errno = 0;
- d = PR_strtod(cstr, &estr);
- free(cstr);
- if (errno == ERANGE)
- return JS_FALSE;
- *ep = (jschar *)s + (estr - cstr);
- *dp = d;
- return JS_TRUE;
- }
-
- /* XXXbe rewrite me! */
- JSBool
- js_strtol(const jschar *s, jschar **ep, jsint radix, jsdouble *dp)
- {
- size_t i, n;
- char *cstr, *estr;
- long l;
-
- n = js_strlen(s);
- cstr = malloc(n + 1);
- if (!cstr)
- return JS_FALSE;
- for (i = 0; i <= n; i++) {
- if (s[i] >> 8) {
- free(cstr);
- return JS_FALSE;
- }
- cstr[i] = (char)s[i];
- }
- errno = 0;
- l = strtol(cstr, &estr, radix);
- free(cstr);
- if (errno == ERANGE)
- return JS_FALSE;
- *ep = (jschar *)s + (estr - cstr);
- *dp = (jsdouble)l;
- return JS_TRUE;
- }
-