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edit: Small refactor.

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This commit is contained in:
Qi Xiao 2016-02-13 19:17:20 +01:00
parent 011f4dcaa2
commit 4586199219
2 changed files with 13 additions and 14 deletions
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2
edit/key.go
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@ -14,8 +14,6 @@ type Key struct {
// Predefined special Key values.
var (
// ZeroKey is the zero value of Key and is an invalid value.
ZeroKey = Key{}
// Default is used in the key binding table to indicate default binding.
Default = Key{DefaultBindingRune, 0}
)

25
edit/reader.go
View File

@ -186,7 +186,6 @@ func (rd *Reader) readOne(r rune) {
// CSI style function key sequence, looks like [\d;]*[^\d;]
// Read numeric parameters (if any)
nums := make([]int, 0, 2)
seq := "\x1b["
isMouse := false
CSISeq:
for {
@ -196,7 +195,6 @@ func (rd *Reader) readOne(r rune) {
k = Key{'[', Alt}
return
}
seq += string(r)
switch {
case r == ';':
nums = append(nums, 0)
@ -239,7 +237,10 @@ func (rd *Reader) readOne(r rune) {
}
mouse = mouseEvent{pos{nums[2], nums[1]}, down, button, mod}
} else {
k, err = parseCSI(nums, r, seq)
k = parseCSI(nums, r, currentSeq)
if k == (Key{}) {
err = newBadEscSeq(currentSeq, "bad CSI")
}
}
case 'O':
// G3 style function key sequence: read one rune.
@ -258,7 +259,7 @@ func (rd *Reader) readOne(r rune) {
k = Key{r2, Alt}
}
default:
// Sane Ctrl- sequences that agree with the keyboard...
// Regular Ctrl sequences.
if 0x1 <= r && r <= 0x1d {
k = Key{r + 0x40, Ctrl}
} else {
@ -315,16 +316,16 @@ var keyByNum2 = map[int]rune{
}
// parseCSI parses a CSI-style key sequence.
func parseCSI(nums []int, last rune, seq string) (Key, error) {
func parseCSI(nums []int, last rune, seq string) Key {
if k, ok := keyByLast[last]; ok {
if len(nums) == 0 {
// Unmodified: \e[A (Up)
return k, nil
return k
} else if len(nums) == 2 && nums[0] == 1 {
// Modified: \e[1;5A (Ctrl-Up)
return xtermModify(k, nums[1], seq)
} else {
return ZeroKey, newBadEscSeq(seq, "bad CSI")
return Key{}
}
}
@ -334,7 +335,7 @@ func parseCSI(nums []int, last rune, seq string) (Key, error) {
k := Key{r, 0}
if len(nums) == 1 {
// Unmodified: \e[5~ (PageUp)
return k, nil
return k
}
// Modified: \e[5;5~ (Ctrl-PageUp)
return xtermModify(k, nums[1], seq)
@ -347,10 +348,10 @@ func parseCSI(nums []int, last rune, seq string) (Key, error) {
}
}
return ZeroKey, newBadEscSeq(seq, "bad CSI")
return Key{}
}
func xtermModify(k Key, mod int, seq string) (Key, error) {
func xtermModify(k Key, mod int, seq string) Key {
switch mod {
case 0:
// do nothing
@ -369,7 +370,7 @@ func xtermModify(k Key, mod int, seq string) (Key, error) {
case 8:
k.Mod |= Shift | Alt | Ctrl
default:
return ZeroKey, newBadEscSeq(seq, "bad mod")
return Key{}
}
return k, nil
return k
}