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author | Rob Pike <r@golang.org> | 2009-11-20 11:04:51 -0800 |
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committer | Rob Pike <r@golang.org> | 2009-11-20 11:04:51 -0800 |
commit | 37c59fc0b9d3b46576fcd96a8c1420b09d599a13 (patch) | |
tree | 08a6130f29e7965ad880120f24a9c1bb62d12481 /src/pkg/fmt | |
parent | 0b471c4c0fdf44a4e354f21fcee1af058f95d31c (diff) | |
download | golang-37c59fc0b9d3b46576fcd96a8c1420b09d599a13.tar.gz |
add unimplemented %+ and % (space) flags to floating-point print.
fix %E: was same as %e.
add tests.
Fixes issue 278.
R=rsc
CC=golang-dev
http://codereview.appspot.com/157111
Diffstat (limited to 'src/pkg/fmt')
-rw-r--r-- | src/pkg/fmt/fmt_test.go | 14 | ||||
-rw-r--r-- | src/pkg/fmt/format.go | 34 |
2 files changed, 37 insertions, 11 deletions
diff --git a/src/pkg/fmt/fmt_test.go b/src/pkg/fmt/fmt_test.go index 5d9b3abe5..3d9d9bf6f 100644 --- a/src/pkg/fmt/fmt_test.go +++ b/src/pkg/fmt/fmt_test.go @@ -101,8 +101,22 @@ var fmttests = []fmtTest{ fmtTest{"%010.3d", -1, " -001"}, fmtTest{"%+d", 12345, "+12345"}, fmtTest{"%+d", -12345, "-12345"}, + fmtTest{"%+d", 0, "+0"}, + fmtTest{"% d", 0, " 0"}, fmtTest{"% d", 12345, " 12345"}, + // floats + fmtTest{"%+.3e", 0.0, "+0.000e+00"}, + fmtTest{"%+.3e", 1.0, "+1.000e+00"}, + fmtTest{"%+.3f", -1.0, "-1.000"}, + fmtTest{"% .3E", -1.0, "-1.000E+00"}, + fmtTest{"% .3e", 1.0, " 1.000e+00"}, + fmtTest{"%+.3g", 0.0, "+0"}, + fmtTest{"%+.3g", 1.0, "+1"}, + fmtTest{"%+.3g", -1.0, "-1"}, + fmtTest{"% .3g", -1.0, "-1"}, + fmtTest{"% .3g", 1.0, " 1"}, + // erroneous formats fmtTest{"", 2, "?(extra int=2)"}, fmtTest{"%d", "hello", "%d(string=hello)"}, diff --git a/src/pkg/fmt/format.go b/src/pkg/fmt/format.go index 8407fbe0b..bf13ac314 100644 --- a/src/pkg/fmt/format.go +++ b/src/pkg/fmt/format.go @@ -422,33 +422,45 @@ func fmtString(f *Fmt, s string) *Fmt { return f; } +// Add a plus sign or space to the string if missing and required. +func (f *Fmt) plusSpace(s string) *Fmt { + if s[0] != '-' { + if f.plus { + s = "+" + s + } else if f.space { + s = " " + s + } + } + return fmtString(f, s); +} + // Fmt_e64 formats a float64 in the form -1.23e+12. func (f *Fmt) Fmt_e64(v float64) *Fmt { - return fmtString(f, strconv.Ftoa64(v, 'e', doPrec(f, 6))) + return f.plusSpace(strconv.Ftoa64(v, 'e', doPrec(f, 6))) } // Fmt_E64 formats a float64 in the form -1.23E+12. func (f *Fmt) Fmt_E64(v float64) *Fmt { - return fmtString(f, strconv.Ftoa64(v, 'E', doPrec(f, 6))) + return f.plusSpace(strconv.Ftoa64(v, 'E', doPrec(f, 6))) } // Fmt_f64 formats a float64 in the form -1.23. func (f *Fmt) Fmt_f64(v float64) *Fmt { - return fmtString(f, strconv.Ftoa64(v, 'f', doPrec(f, 6))) + return f.plusSpace(strconv.Ftoa64(v, 'f', doPrec(f, 6))) } // Fmt_g64 formats a float64 in the 'f' or 'e' form according to size. func (f *Fmt) Fmt_g64(v float64) *Fmt { - return fmtString(f, strconv.Ftoa64(v, 'g', doPrec(f, -1))) + return f.plusSpace(strconv.Ftoa64(v, 'g', doPrec(f, -1))) } // Fmt_g64 formats a float64 in the 'f' or 'E' form according to size. func (f *Fmt) Fmt_G64(v float64) *Fmt { - return fmtString(f, strconv.Ftoa64(v, 'G', doPrec(f, -1))) + return f.plusSpace(strconv.Ftoa64(v, 'G', doPrec(f, -1))) } // Fmt_fb64 formats a float64 in the form -123p3 (exponent is power of 2). -func (f *Fmt) Fmt_fb64(v float64) *Fmt { return fmtString(f, strconv.Ftoa64(v, 'b', 0)) } +func (f *Fmt) Fmt_fb64(v float64) *Fmt { return f.plusSpace(strconv.Ftoa64(v, 'b', 0)) } // float32 // cannot defer to float64 versions @@ -456,27 +468,27 @@ func (f *Fmt) Fmt_fb64(v float64) *Fmt { return fmtString(f, strconv.Ftoa64(v, ' // Fmt_e32 formats a float32 in the form -1.23e+12. func (f *Fmt) Fmt_e32(v float32) *Fmt { - return fmtString(f, strconv.Ftoa32(v, 'e', doPrec(f, 6))) + return f.plusSpace(strconv.Ftoa32(v, 'e', doPrec(f, 6))) } // Fmt_E32 formats a float32 in the form -1.23E+12. func (f *Fmt) Fmt_E32(v float32) *Fmt { - return fmtString(f, strconv.Ftoa32(v, 'e', doPrec(f, 6))) + return f.plusSpace(strconv.Ftoa32(v, 'E', doPrec(f, 6))) } // Fmt_f32 formats a float32 in the form -1.23. func (f *Fmt) Fmt_f32(v float32) *Fmt { - return fmtString(f, strconv.Ftoa32(v, 'f', doPrec(f, 6))) + return f.plusSpace(strconv.Ftoa32(v, 'f', doPrec(f, 6))) } // Fmt_g32 formats a float32 in the 'f' or 'e' form according to size. func (f *Fmt) Fmt_g32(v float32) *Fmt { - return fmtString(f, strconv.Ftoa32(v, 'g', doPrec(f, -1))) + return f.plusSpace(strconv.Ftoa32(v, 'g', doPrec(f, -1))) } // Fmt_G32 formats a float32 in the 'f' or 'E' form according to size. func (f *Fmt) Fmt_G32(v float32) *Fmt { - return fmtString(f, strconv.Ftoa32(v, 'G', doPrec(f, -1))) + return f.plusSpace(strconv.Ftoa32(v, 'G', doPrec(f, -1))) } // Fmt_fb32 formats a float32 in the form -123p3 (exponent is power of 2). |