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AK+Tests: Fix formatting of infinity and NaN values

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When I added this code in 1472f6d, I forgot to add tests for it. That's
why I didn't realize that the values were appended to the wrong
FormatBuilder object, so an empty string was returned instead of the
expected "nan"/"inf". This made debugging some FPU issues with the
ScummVM port significantly more difficult.
This commit is contained in:
Daniel Bertalan 2021-10-30 10:43:21 +02:00 committed by Andreas Kling
parent 2c93ee50cd
commit fed9cb5d2d
2 changed files with 9 additions and 4 deletions
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8
AK/Format.cpp
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@ -365,14 +365,14 @@ void FormatBuilder::put_f64(
string_builder.append('-');
else if (sign_mode == SignMode::Always)
string_builder.append('+');
else
else if (sign_mode == SignMode::Reserved)
string_builder.append(' ');
if (isnan(value))
string_builder.append(upper_case ? "NAN"sv : "nan"sv);
else
string_builder.append(upper_case ? "INF"sv : "inf"sv);
format_builder.put_string(string_builder.string_view(), align, min_width, NumericLimits<size_t>::max(), fill);
put_string(string_builder.string_view(), align, min_width, NumericLimits<size_t>::max(), fill);
return;
}
@ -431,14 +431,14 @@ void FormatBuilder::put_f80(
string_builder.append('-');
else if (sign_mode == SignMode::Always)
string_builder.append('+');
else
else if (sign_mode == SignMode::Reserved)
string_builder.append(' ');
if (isnan(value))
string_builder.append(upper_case ? "NAN"sv : "nan"sv);
else
string_builder.append(upper_case ? "INF"sv : "inf"sv);
format_builder.put_string(string_builder.string_view(), align, min_width, NumericLimits<size_t>::max(), fill);
put_string(string_builder.string_view(), align, min_width, NumericLimits<size_t>::max(), fill);
return;
}

5
Tests/AK/TestFormat.cpp
View file

@ -9,6 +9,7 @@
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <AK/Vector.h>
#include <math.h>
TEST_CASE(is_integral_works_properly)
{
@ -241,6 +242,10 @@ TEST_CASE(floating_point_numbers)
EXPECT_EQ(String::formatted("{:.1}", 1.12), "1.1");
EXPECT_EQ(String::formatted("{}", -1.12), "-1.12");
EXPECT_EQ(String::formatted("{}", NAN), "nan");
EXPECT_EQ(String::formatted("{}", INFINITY), "inf");
EXPECT_EQ(String::formatted("{}", -INFINITY), "-inf");
// FIXME: There is always the question what we mean with the width field. Do we mean significant digits?
// Do we mean the whole width? This is what was the simplest to implement:
EXPECT_EQ(String::formatted("{:x>5.1}", 1.12), "xx1.1");