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json encoder: Harmonize number serialization with ES6

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Ensures that numbers representable as 64-bit integer
are not printed using exponent notation.

Some JSON implementations such as the one of the Go
standard library expect this in the default
conversion to int.

Change-Id: Ic3ac718b7fd36462b4fcabbfb100a528a87798c8
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Marius Kittler 2017-02-27 22:16:41 +01:00
parent 5ca7d56aca
commit 38550c562d
2 changed files with 35 additions and 3 deletions
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9
src/corelib/json/qjsonwriter.cpp
View File

@ -38,6 +38,7 @@
**
****************************************************************************/
#include <cmath>
#include <qlocale.h>
#include "qjsonwriter_p.h"
#include "qjson_p.h"
@ -129,10 +130,12 @@ static void valueToJson(const QJsonPrivate::Base *b, const QJsonPrivate::Value &
break;
case QJsonValue::Double: {
const double d = v.toDouble(b);
if (qIsFinite(d)) // +2 to format to ensure the expected precision
json += QByteArray::number(d, 'g', QLocale::FloatingPointShortest);
else
if (qIsFinite(d)) { // +2 to format to ensure the expected precision
const double abs = std::abs(d);
json += QByteArray::number(d, abs == static_cast<quint64>(abs) ? 'f' : 'g', QLocale::FloatingPointShortest);
} else {
json += "null"; // +INF || -INF || NaN (see RFC4627#section2.4)
}
break;
}
case QJsonValue::String:

29
tests/auto/corelib/json/tst_qtjson.cpp
View File

@ -32,6 +32,7 @@
#include "qjsonobject.h"
#include "qjsonvalue.h"
#include "qjsondocument.h"
#include "qregularexpression.h"
#include <limits>
#define INVALID_UNICODE "\xCE\xBA\xE1"
@ -49,6 +50,7 @@ private Q_SLOTS:
void testNumbers();
void testNumbers_2();
void testNumbers_3();
void testNumbers_4();
void testObjectSimple();
void testObjectSmallKeys();
@ -375,6 +377,33 @@ void tst_QtJson::testNumbers_3()
QVERIFY(d1_1 != d2_1);
}
void tst_QtJson::testNumbers_4()
{
// no exponent notation used to print numbers between -2^64 and 2^64
QJsonArray array;
array << QJsonValue(+1000000000000000.0);
array << QJsonValue(-1000000000000000.0);
array << QJsonValue(+9007199254740992.0);
array << QJsonValue(-9007199254740992.0);
array << QJsonValue(+9223372036854775808.0);
array << QJsonValue(-9223372036854775808.0);
array << QJsonValue(+18446744073709551616.0);
array << QJsonValue(-18446744073709551616.0);
const QByteArray json(QJsonDocument(array).toJson());
const QByteArray expected =
"[\n"
" 1000000000000000,\n"
" -1000000000000000,\n"
" 9007199254740992,\n"
" -9007199254740992,\n"
" 9223372036854776000,\n"
" -9223372036854776000,\n"
" 18446744073709552000,\n"
" -18446744073709552000\n"
"]\n";
QCOMPARE(json, expected);
}
void tst_QtJson::testObjectSimple()
{
QJsonObject object;