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Modified handling of zero precision in formatFloat (#6719)

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This commit is contained in:
Fabian Keller
2017-11-15 21:23:33 +01:00
committed by Andreas Rumpf
parent 0ab373115c
commit 5e66a7ce59
2 changed files with 16 additions and 9 deletions
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4
changelog.md
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@@ -74,5 +74,9 @@ This now needs to be written as:
var a = -5
for i in a..b:
echo i
- ``formatFloat``/``formatBiggestFloat`` now support formatting floats with zero
precision digits. The previous ``precision = 0`` behavior (default formatting)
is now available via ``precision = -1``.
- Removed deprecated romans module from the stdlib and published it as separate
Nimble package.

21
lib/pure/strutils.nim
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@@ -1927,7 +1927,7 @@ type
{.deprecated: [TFloatFormat: FloatFormatMode].}
proc formatBiggestFloat*(f: BiggestFloat, format: FloatFormatMode = ffDefault,
precision: range[0..32] = 16;
precision: range[-1..32] = 16;
decimalSep = '.'): string {.
noSideEffect, rtl, extern: "nsu$1".} =
## Converts a floating point value `f` to a string.
@@ -1939,7 +1939,7 @@ proc formatBiggestFloat*(f: BiggestFloat, format: FloatFormatMode = ffDefault,
## `precision`'s default value is the maximum number of meaningful digits
## after the decimal point for Nim's ``biggestFloat`` type.
##
## If ``precision == 0``, it tries to format it nicely.
## If ``precision == -1``, it tries to format it nicely.
when defined(js):
var res: cstring
case format
@@ -1961,7 +1961,7 @@ proc formatBiggestFloat*(f: BiggestFloat, format: FloatFormatMode = ffDefault,
buf {.noinit.}: array[0..2500, char]
L: cint
frmtstr[0] = '%'
if precision > 0:
if precision >= 0:
frmtstr[1] = '#'
frmtstr[2] = '.'
frmtstr[3] = '*'
@@ -1995,7 +1995,7 @@ proc formatBiggestFloat*(f: BiggestFloat, format: FloatFormatMode = ffDefault,
result.setLen(result.len - 1)
proc formatFloat*(f: float, format: FloatFormatMode = ffDefault,
precision: range[0..32] = 16; decimalSep = '.'): string {.
precision: range[-1..32] = 16; decimalSep = '.'): string {.
noSideEffect, rtl, extern: "nsu$1".} =
## Converts a floating point value `f` to a string.
##
@@ -2006,16 +2006,16 @@ proc formatFloat*(f: float, format: FloatFormatMode = ffDefault,
## `precision`'s default value is the maximum number of meaningful digits
## after the decimal point for Nim's ``float`` type.
##
## If ``precision == 0``, it tries to format it nicely.
## If ``precision == -1``, it tries to format it nicely.
##
## Examples:
##
## .. code-block:: nim
##
## let x = 123.456
## echo x.formatFloat() # 123.4560000000000
## echo x.formatFloat(ffDecimal, 4) # 123.4560
## echo x.formatFloat(ffScientific, 2) # 1.23e+02
## doAssert x.formatFloat() == "123.4560000000000"
## doAssert x.formatFloat(ffDecimal, 4) == "123.4560"
## doAssert x.formatFloat(ffScientific, 2) == "1.23e+02"
##
result = formatBiggestFloat(f, format, precision, decimalSep)
@@ -2471,11 +2471,14 @@ when isMainModule:
outp = " this is a\nlong text\n--\nmuchlongerthan10chars\nand here\nit goes"
doAssert wordWrap(inp, 10, false) == outp
doAssert formatBiggestFloat(1234.567, ffDecimal, -1) == "1234.567000"
doAssert formatBiggestFloat(1234.567, ffDecimal, 0) == "1235."
doAssert formatBiggestFloat(1234.567, ffDecimal, 1) == "1234.6"
doAssert formatBiggestFloat(0.00000000001, ffDecimal, 11) == "0.00000000001"
doAssert formatBiggestFloat(0.00000000001, ffScientific, 1, ',') in
["1,0e-11", "1,0e-011"]
# bug #6589
doAssert formatFloat(123.456, ffScientific, precision=0) in
doAssert formatFloat(123.456, ffScientific, precision = -1) in
["1.234560e+02", "1.234560e+002"]
doAssert "$# $3 $# $#" % ["a", "b", "c"] == "a c b c"