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