LCOV - app.info - js/src/jsnuminlines.h

LCOV - code coverage report
| Current view: | directory - js/src - jsnuminlines.h (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 33 | 27 | 81.8 %
| Date: | 2012-04-07 | Functions: | 7 | 3 | 42.9 %

           1                 : /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
           2                 :  *
           3                 :  * ***** BEGIN LICENSE BLOCK *****
           4                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
           5                 :  *
           6                 :  * The contents of this file are subject to the Mozilla Public License Version
           7                 :  * 1.1 (the "License"); you may not use this file except in compliance with
           8                 :  * the License. You may obtain a copy of the License at
           9                 :  * http://www.mozilla.org/MPL/
          10                 :  *
          11                 :  * Software distributed under the License is distributed on an "AS IS" basis,
          12                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
          13                 :  * for the specific language governing rights and limitations under the
          14                 :  * License.
          15                 :  *
          16                 :  * The Original Code is Mozilla Communicator client code, released
          17                 :  * March 31, 1998.
          18                 :  *
          19                 :  * The Initial Developer of the Original Code is
          20                 :  * the Mozilla Foundation.
          21                 :  * Portions created by the Initial Developer are Copyright (C) 2011
          22                 :  * the Initial Developer. All Rights Reserved.
          23                 :  *
          24                 :  * Contributor(s):
          25                 :  *
          26                 :  * Alternatively, the contents of this file may be used under the terms of
          27                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
          28                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
          29                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
          30                 :  * of those above. If you wish to allow use of your version of this file only
          31                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
          32                 :  * use your version of this file under the terms of the MPL, indicate your
          33                 :  * decision by deleting the provisions above and replace them with the notice
          34                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
          35                 :  * the provisions above, a recipient may use your version of this file under
          36                 :  * the terms of any one of the MPL, the GPL or the LGPL.
          37                 :  *
          38                 :  * ***** END LICENSE BLOCK ***** */
          39                 :
          40                 : #ifndef jsnuminlines_h___
          41                 : #define jsnuminlines_h___
          42                 :
          43                 : #include "vm/Unicode.h"
          44                 :
          45                 : #include "jsstrinlines.h"
          46                 :
          47                 :
          48                 : namespace js {
          49                 :
          50                 : template<typename T> struct NumberTraits { };
          51                 : template<> struct NumberTraits<int32_t> {
          52               0 :   static JS_ALWAYS_INLINE int32_t NaN() { return 0; }
          53               0 :   static JS_ALWAYS_INLINE int32_t toSelfType(int32_t i) { return i; }
          54               0 :   static JS_ALWAYS_INLINE int32_t toSelfType(double d) { return js_DoubleToECMAUint32(d); }
          55                 : };
          56                 : template<> struct NumberTraits<double> {
          57          299876 :   static JS_ALWAYS_INLINE double NaN() { return js_NaN; }
          58                 :   static JS_ALWAYS_INLINE double toSelfType(int32_t i) { return i; }
          59          381056 :   static JS_ALWAYS_INLINE double toSelfType(double d) { return d; }
          60                 : };
          61                 :
          62                 : template<typename T>
          63                 : static JS_ALWAYS_INLINE bool
          64          680932 : StringToNumberType(JSContext *cx, JSString *str, T *result)
          65                 : {
          66          680932 :     size_t length = str->length();
          67          680932 :     const jschar *chars = str->getChars(NULL);
          68          680932 :     if (!chars)
          69               0 :         return false;
          70                 :
          71          680932 :     if (length == 1) {
          72           82631 :         jschar c = chars[0];
          73           82631 :         if ('0' <= c && c <= '9') {
          74           55991 :             *result = NumberTraits<T>::toSelfType(T(c - '0'));
          75           55991 :             return true;
          76                 :         }
          77           26640 :         if (unicode::IsSpace(c)) {
          78              27 :             *result = NumberTraits<T>::toSelfType(T(0));
          79              27 :             return true;
          80                 :         }
          81           26613 :         *result = NumberTraits<T>::NaN();
          82           26613 :         return true;
          83                 :     }
          84                 :
          85          598301 :     const jschar *end = chars + length;
          86          598301 :     const jschar *bp = SkipSpace(chars, end);
          87                 :
          88                 :     /* ECMA doesn't allow signed hex numbers (bug 273467). */
          89          598301 :     if (end - bp >= 2 && bp[0] == '0' && (bp[1] == 'x' || bp[1] == 'X')) {
          90                 :         /* Looks like a hex number. */
          91                 :         const jschar *endptr;
          92                 :         double d;
          93             189 :         if (!GetPrefixInteger(cx, bp + 2, end, 16, &endptr, &d) || SkipSpace(endptr, end) != end) {
          94               0 :             *result = NumberTraits<T>::NaN();
          95               0 :             return true;
          96                 :         }
          97             189 :         *result = NumberTraits<T>::toSelfType(d);
          98             189 :         return true;
          99                 :     }
         100                 :
         101                 :     /*
         102                 :      * Note that ECMA doesn't treat a string beginning with a '0' as
         103                 :      * an octal number here. This works because all such numbers will
         104                 :      * be interpreted as decimal by js_strtod.  Also, any hex numbers
         105                 :      * that have made it here (which can only be negative ones) will
         106                 :      * be treated as 0 without consuming the 'x' by js_strtod.
         107                 :      */
         108                 :     const jschar *ep;
         109                 :     double d;
         110          598112 :     if (!js_strtod(cx, bp, end, &ep, &d) || SkipSpace(ep, end) != end) {
         111          273263 :         *result = NumberTraits<T>::NaN();
         112          273263 :         return true;
         113                 :     }
         114          324849 :     *result = NumberTraits<T>::toSelfType(d);
         115          324849 :     return true;
         116                 : }
         117                 :
         118                 : } // namespace js
         119                 :
         120                 : #endif /* jsnuminlines_h___ */

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