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// License: GPLv3 Copyright: 2022, Kovid Goyal, <kovid at kovidgoyal.net>
package wcswidth
import (
"fmt"
"strconv"
"strings"
"github.com/kovidgoyal/kitty/tools/utils"
)
var _ = fmt.Print
type WCWidthIterator struct {
prev_ch rune
prev_width, current_width int
seg GraphemeSegmentationResult
can_combine bool
parser EscapeCodeParser
rune_count uint
}
func CreateWCWidthIterator() *WCWidthIterator {
var ans WCWidthIterator
ans.parser.HandleRune = ans.handle_rune
ans.parser.HandleCSI = ans.handle_csi
ans.parser.HandleOSC = ans.handle_st_terminated
ans.parser.HandleDCS = ans.handle_st_terminated
ans.parser.HandlePM = ans.handle_st_terminated
ans.parser.HandleSOS = ans.handle_st_terminated
ans.parser.HandleAPC = ans.handle_st_terminated
return &ans
}
func (self *WCWidthIterator) Reset() {
self.prev_ch = 0
self.prev_width = 0
self.current_width = 0
self.rune_count = 0
self.can_combine = false
self.seg = 0
self.parser.Reset()
}
func (self *WCWidthIterator) handle_csi(csi []byte) error {
if len(csi) > 1 && csi[len(csi)-1] == 'b' {
num_string := utils.UnsafeBytesToString(csi[:len(csi)-1])
n, err := strconv.Atoi(num_string)
if err == nil && n > 0 {
for i := 0; i < n; i++ {
err = self.handle_rune(self.prev_ch)
if err != nil {
return err
}
}
}
}
self.can_combine = false
self.seg = 0
return nil
}
func (self *WCWidthIterator) handle_st_terminated(data []byte) error {
self.can_combine = false
self.seg = 0
return nil
}
func (self *WCWidthIterator) handle_rune(ch rune) error {
self.rune_count += 1
cp := CharPropsFor(ch)
self.seg = self.seg.Step(cp)
if self.can_combine && self.seg.Add_to_current_cell() == 1 {
switch ch {
case 0xfe0f:
if CharPropsFor(self.prev_ch).Is_emoji_presentation_base() == 1 && self.prev_width == 1 {
self.current_width += 1
self.prev_width = 2
}
case 0xfe0e:
if CharPropsFor(self.prev_ch).Is_emoji_presentation_base() == 1 && self.prev_width == 2 {
self.current_width -= 1
self.prev_width = 1
}
}
} else {
width := cp.Width()
switch width {
case -1:
case 0:
self.prev_width = 0
case 2:
self.prev_width = 2
default:
self.prev_width = 1
}
self.current_width += self.prev_width
self.can_combine = true
}
self.prev_ch = ch
return nil
}
func (self *WCWidthIterator) ParseByte(b byte) (ans int) {
self.parser.ParseByte(b)
return self.current_width
}
func (self *WCWidthIterator) Parse(b []byte) (ans int) {
self.current_width = 0
self.parser.Parse(b)
return self.current_width
}
func (self *WCWidthIterator) CurrentWidth() int {
return self.current_width
}
func Stringwidth(text string) int {
w := CreateWCWidthIterator()
return w.Parse(utils.UnsafeStringToBytes(text))
}
func StripEscapeCodes(text string) string {
out := strings.Builder{}
out.Grow(len(text))
p := EscapeCodeParser{}
p.HandleRune = func(ch rune) error {
out.WriteRune(ch)
return nil
}
p.ParseString(text)
return out.String()
}
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