Revision ee9a03ab4a41c8293d0a5380315e0a59dd28c0a3 authored by ffxbld on 16 February 2012, 06:18:07 UTC, committed by ffxbld on 16 February 2012, 06:18:07 UTC
--HG-- branch : MOBILE1002_2012021522_RELBRANCH
1 parent abe4314
jsnuminlines.h
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is
* the Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef jsnuminlines_h___
#define jsnuminlines_h___
#include "vm/Unicode.h"
#include "jsstrinlines.h"
namespace js {
template<typename T> struct NumberTraits { };
template<> struct NumberTraits<int32> {
static JS_ALWAYS_INLINE int32 NaN() { return 0; }
static JS_ALWAYS_INLINE int32 toSelfType(int32 i) { return i; }
static JS_ALWAYS_INLINE int32 toSelfType(jsdouble d) { return js_DoubleToECMAUint32(d); }
};
template<> struct NumberTraits<jsdouble> {
static JS_ALWAYS_INLINE jsdouble NaN() { return js_NaN; }
static JS_ALWAYS_INLINE jsdouble toSelfType(int32 i) { return i; }
static JS_ALWAYS_INLINE jsdouble toSelfType(jsdouble d) { return d; }
};
template<typename T>
static JS_ALWAYS_INLINE bool
StringToNumberType(JSContext *cx, JSString *str, T *result)
{
size_t length = str->length();
const jschar *chars = str->getChars(NULL);
if (!chars)
return false;
if (length == 1) {
jschar c = chars[0];
if ('0' <= c && c <= '9') {
*result = NumberTraits<T>::toSelfType(T(c - '0'));
return true;
}
if (unicode::IsSpace(c)) {
*result = NumberTraits<T>::toSelfType(T(0));
return true;
}
*result = NumberTraits<T>::NaN();
return true;
}
const jschar *end = chars + length;
const jschar *bp = SkipSpace(chars, end);
/* ECMA doesn't allow signed hex numbers (bug 273467). */
if (end - bp >= 2 && bp[0] == '0' && (bp[1] == 'x' || bp[1] == 'X')) {
/* Looks like a hex number. */
const jschar *endptr;
double d;
if (!GetPrefixInteger(cx, bp + 2, end, 16, &endptr, &d) || SkipSpace(endptr, end) != end) {
*result = NumberTraits<T>::NaN();
return true;
}
*result = NumberTraits<T>::toSelfType(d);
return true;
}
/*
* Note that ECMA doesn't treat a string beginning with a '0' as
* an octal number here. This works because all such numbers will
* be interpreted as decimal by js_strtod. Also, any hex numbers
* that have made it here (which can only be negative ones) will
* be treated as 0 without consuming the 'x' by js_strtod.
*/
const jschar *ep;
double d;
if (!js_strtod(cx, bp, end, &ep, &d) || SkipSpace(ep, end) != end) {
*result = NumberTraits<T>::NaN();
return true;
}
*result = NumberTraits<T>::toSelfType(d);
return true;
}
} // namespace js
#endif /* jsnuminlines_h___ */
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