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define constants for option strings

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this prevents extra allocations in ParseOptions and cleans up the code a
bit, but doesn't actually improve performance in any meaningful way.
This commit is contained in:
Will Norris 2015-01-25 00:30:15 -08:00
parent c79633735f
commit 0980ea64a0
2 changed files with 28 additions and 12 deletions
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35
data.go
View file

@ -23,6 +23,14 @@ import (
"strings"
)
const (
optFit = "fit"
optFlipVertical = "fv"
optFlipHorizontal = "fh"
optRotatePrefix = "r"
optSizeDelimiter = "x"
)
// URLError reports a malformed URL error.
type URLError struct {
Message string
@ -55,18 +63,18 @@ var emptyOptions = Options{}
func (o Options) String() string {
buf := new(bytes.Buffer)
fmt.Fprintf(buf, "%vx%v", o.Width, o.Height)
fmt.Fprintf(buf, "%v%s%v", o.Width, optSizeDelimiter, o.Height)
if o.Fit {
buf.WriteString(",fit")
fmt.Fprintf(buf, ",%s", optFit)
}
if o.Rotate != 0 {
fmt.Fprintf(buf, ",r%d", o.Rotate)
fmt.Fprintf(buf, ",%s%d", string(optRotatePrefix), o.Rotate)
}
if o.FlipVertical {
buf.WriteString(",fv")
fmt.Fprintf(buf, ",%s", optFlipVertical)
}
if o.FlipHorizontal {
buf.WriteString(",fh")
fmt.Fprintf(buf, ",%s", optFlipHorizontal)
}
return buf.String()
}
@ -127,16 +135,19 @@ func ParseOptions(str string) Options {
for _, opt := range strings.Split(str, ",") {
switch {
case opt == "fit":
case len(opt) == 0:
break
case opt == optFit:
options.Fit = true
case opt == "fv":
case opt == optFlipVertical:
options.FlipVertical = true
case opt == "fh":
case opt == optFlipHorizontal:
options.FlipHorizontal = true
case len(opt) > 2 && opt[:1] == "r":
options.Rotate, _ = strconv.Atoi(opt[1:])
case strings.ContainsRune(opt, 'x'):
size := strings.SplitN(opt, "x", 2)
case strings.HasPrefix(opt, optRotatePrefix):
value := strings.TrimPrefix(opt, optRotatePrefix)
options.Rotate, _ = strconv.Atoi(value)
case strings.Contains(opt, optSizeDelimiter):
size := strings.SplitN(opt, optSizeDelimiter, 2)
if w := size[0]; w != "" {
options.Width, _ = strconv.ParseFloat(w, 64)
}

5
data_test.go
View file

@ -32,6 +32,10 @@ func TestOptions_String(t *testing.T) {
Options{1, 2, true, 90, true, true},
"1x2,fit,r90,fv,fh",
},
{
Options{0.15, 1.3, false, 45, false, false},
"0.15x1.3,r45",
},
}
for i, tt := range tests {
@ -48,6 +52,7 @@ func TestParseOptions(t *testing.T) {
}{
{"", emptyOptions},
{"x", emptyOptions},
{"r", emptyOptions},
{"0", emptyOptions},
{",,,,", emptyOptions},