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Fixed a parsing bug in decodeNumber, updating the failing test cases to be

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correct in the process. (The test cases incorrectly used exact integers instead
of scientific notation.)
This commit is contained in:
Aaron Jacobs 2011-05-24 03:59:24 +00:00
parent e656c5fa2d
commit ae9ffb5443
5 changed files with 12 additions and 8 deletions
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13
src/lib_json/json_reader.cpp
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@ -573,8 +573,6 @@ Reader::decodeNumber( Token &token )
Value::LargestUInt maxIntegerValue = isNegative ? Value::LargestUInt(-Value::minLargestInt)
: Value::maxLargestUInt;
Value::LargestUInt threshold = maxIntegerValue / 10;
Value::UInt lastDigitThreshold = Value::UInt( maxIntegerValue % 10 );
assert( lastDigitThreshold >=0 && lastDigitThreshold <= 9 );
Value::LargestUInt value = 0;
while ( current < token.end_ )
{
@ -584,10 +582,13 @@ Reader::decodeNumber( Token &token )
Value::UInt digit(c - '0');
if ( value >= threshold )
{
// If the current digit is not the last one, or if it is
// greater than the last digit of the maximum integer value,
// the parse the number as a double.
if ( current != token.end_ || digit > lastDigitThreshold )
// We've hit or exceeded the max value divided by 10 (rounded down). If
// a) we've only just touched the limit, b) this is the last digit, and
// c) it's small enough to fit in that rounding delta, we're okay.
// Otherwise treat this number as a double to avoid overflow.
if (value > threshold ||
current != token.end_ ||
digit > maxIntegerValue % 10)
{
return decodeDouble( token );
}

2
test/data/test_real_09.expected
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@ -1 +1 @@
.=19000000000000000001
.=1.9e+19

2
test/data/test_real_11.expected
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@ -1 +1 @@
.=-9300000000000000001
.=-9.3e+18

1
test/data/test_real_12.expected Normal file
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@ -0,0 +1 @@
.=1.844674407370955e+19

2
test/data/test_real_12.json Normal file
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@ -0,0 +1,2 @@
// 2^64 -> switch to double.
18446744073709551616