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package util_test
import (
"fmt"
"testing"
"github.com/stretchr/testify/assert"
"lukeshu.com/btrfs-tools/pkg/util"
)
type FmtState struct {
MWidth int
MPrec int
MFlagMinus bool
MFlagPlus bool
MFlagSharp bool
MFlagSpace bool
MFlagZero bool
}
func (st FmtState) Width() (int, bool) {
if st.MWidth < 1 {
return 0, false
}
return st.MWidth, true
}
func (st FmtState) Precision() (int, bool) {
if st.MPrec < 1 {
return 0, false
}
return st.MPrec, true
}
func (st FmtState) Flag(b int) bool {
switch b {
case '-':
return st.MFlagMinus
case '+':
return st.MFlagPlus
case '#':
return st.MFlagSharp
case ' ':
return st.MFlagSpace
case '0':
return st.MFlagZero
}
return false
}
func (st FmtState) Write([]byte) (int, error) {
panic("not implemented")
}
func (dst *FmtState) Format(src fmt.State, verb rune) {
if width, ok := src.Width(); ok {
dst.MWidth = width
}
if prec, ok := src.Precision(); ok {
dst.MPrec = prec
}
dst.MFlagMinus = src.Flag('-')
dst.MFlagPlus = src.Flag('+')
dst.MFlagSharp = src.Flag('#')
dst.MFlagSpace = src.Flag(' ')
dst.MFlagZero = src.Flag('0')
}
// letters only? No 'p', 'T', or 'w'.
const verbs = "abcdefghijklmnoqrstuvxyzABCDEFGHIJKLMNOPQRSUVWXYZ"
func FuzzFmtStateString(f *testing.F) {
f.Fuzz(func(t *testing.T,
width, prec uint8,
flagMinus, flagPlus, flagSharp, flagSpace, flagZero bool,
verbIdx uint8,
) {
if flagMinus {
flagZero = false
}
input := FmtState{
MWidth: int(width),
MPrec: int(prec),
MFlagMinus: flagMinus,
MFlagPlus: flagPlus,
MFlagSharp: flagSharp,
MFlagSpace: flagSpace,
MFlagZero: flagZero,
}
verb := rune(verbs[int(verbIdx)%len(verbs)])
t.Logf("(%#v, %c) => %q", input, verb, util.FmtStateString(input, verb))
var output FmtState
assert.Equal(t, "", fmt.Sprintf(util.FmtStateString(input, verb), &output))
assert.Equal(t, input, output)
})
}
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