1 /*
2 * Copyright (C) 2011 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "config.h"
32 #include "LocalizedNumber.h"
33
34 #include <limits>
35 #include <unicode/numfmt.h>
36 #include <unicode/parsepos.h>
37 #include <wtf/MathExtras.h>
38 #include <wtf/PassOwnPtr.h>
39
40 using namespace icu;
41 using namespace std;
42
43 namespace WebCore {
44
createFormatterForCurrentLocale()45 static PassOwnPtr<NumberFormat> createFormatterForCurrentLocale()
46 {
47 UErrorCode status = U_ZERO_ERROR;
48 OwnPtr<NumberFormat> formatter = adoptPtr(NumberFormat::createInstance(status));
49 return U_SUCCESS(status) ? formatter.release() : nullptr;
50 }
51
52 // This might return 0.
numberFormatter()53 static NumberFormat* numberFormatter()
54 {
55 ASSERT(isMainThread());
56 static NumberFormat* formatter = createFormatterForCurrentLocale().leakPtr();
57 return formatter;
58 }
59
parseLocalizedNumber(const String & numberString)60 double parseLocalizedNumber(const String& numberString)
61 {
62 if (numberString.isEmpty())
63 return numeric_limits<double>::quiet_NaN();
64 NumberFormat* formatter = numberFormatter();
65 if (!formatter)
66 return numeric_limits<double>::quiet_NaN();
67 UnicodeString numberUnicodeString(numberString.characters(), numberString.length());
68 Formattable result;
69 ParsePosition position(0);
70 formatter->parse(numberUnicodeString, result, position);
71 if (position.getIndex() != numberUnicodeString.length())
72 return numeric_limits<double>::quiet_NaN();
73 UErrorCode status = U_ZERO_ERROR;
74 double numericResult = result.getDouble(status);
75 return U_SUCCESS(status) ? numericResult : numeric_limits<double>::quiet_NaN();
76 }
77
formatLocalizedNumber(double number,unsigned fractionDigits)78 String formatLocalizedNumber(double number, unsigned fractionDigits)
79 {
80 NumberFormat* formatter = numberFormatter();
81 if (!formatter)
82 return String();
83 UnicodeString result;
84 formatter->setMaximumFractionDigits(clampToInteger(fractionDigits));
85 formatter->format(number, result);
86 return String(result.getBuffer(), result.length());
87 }
88
89 } // namespace WebCore
90