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// gomuks - A terminal Matrix client written in Go.
// Copyright (C) 2020 Tulir Asokan
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package html
import (
"fmt"
"regexp"
"github.com/mattn/go-runewidth"
"maunium.net/go/gomuks/ui/widget"
"maunium.net/go/mauview"
)
type TextEntity struct {
*BaseEntity
// Text in this entity.
Text string
buffer []string
}
// NewTextEntity creates a new text-only Entity.
func NewTextEntity(text string) *TextEntity {
return &TextEntity{
BaseEntity: &BaseEntity{
Tag: "text",
},
Text: text,
}
}
func (te *TextEntity) AdjustStyle(fn AdjustStyleFunc) Entity {
te.BaseEntity = te.BaseEntity.AdjustStyle(fn).(*BaseEntity)
return te
}
func (te *TextEntity) Clone() Entity {
return &TextEntity{
BaseEntity: te.BaseEntity.Clone().(*BaseEntity),
Text: te.Text,
}
}
func (te *TextEntity) PlainText() string {
return te.Text
}
func (te *TextEntity) String() string {
return fmt.Sprintf("&html.TextEntity{Text=%s, Base=%s},\n", te.Text, te.BaseEntity)
}
func (te *TextEntity) Draw(screen mauview.Screen) {
width, _ := screen.Size()
x := te.startX
for y, line := range te.buffer {
widget.WriteLine(screen, mauview.AlignLeft, line, x, y, width, te.Style)
x = 0
}
}
func (te *TextEntity) CalculateBuffer(width, startX int, bare bool) int {
te.BaseEntity.CalculateBuffer(width, startX, bare)
if len(te.Text) == 0 {
return te.startX
}
te.height = 0
te.prevWidth = width
if te.buffer == nil {
te.buffer = []string{}
}
bufPtr := 0
text := te.Text
textStartX := te.startX
for {
// TODO add option no wrap and character wrap options
extract := runewidth.Truncate(text, width-textStartX, "")
extract, wordWrapped := trim(extract, text, bare)
if !wordWrapped && textStartX > 0 {
if bufPtr < len(te.buffer) {
te.buffer[bufPtr] = ""
} else {
te.buffer = append(te.buffer, "")
}
bufPtr++
textStartX = 0
continue
}
if bufPtr < len(te.buffer) {
te.buffer[bufPtr] = extract
} else {
te.buffer = append(te.buffer, extract)
}
bufPtr++
text = text[len(extract):]
if len(text) == 0 {
te.buffer = te.buffer[:bufPtr]
te.height += len(te.buffer)
// This entity is over, return the startX for the next entity
if te.Block {
// ...except if it's a block entity
return 0
}
return textStartX + runewidth.StringWidth(extract)
}
textStartX = 0
}
}
var (
boundaryPattern = regexp.MustCompile(`([[:punct:]]\s*|\s+)`)
bareBoundaryPattern = regexp.MustCompile(`(\s+)`)
spacePattern = regexp.MustCompile(`\s+`)
)
func trim(extract, full string, bare bool) (string, bool) {
if len(extract) == len(full) {
return extract, true
}
if spaces := spacePattern.FindStringIndex(full[len(extract):]); spaces != nil && spaces[0] == 0 {
extract = full[:len(extract)+spaces[1]]
}
regex := boundaryPattern
if bare {
regex = bareBoundaryPattern
}
matches := regex.FindAllStringIndex(extract, -1)
if len(matches) > 0 {
if match := matches[len(matches)-1]; len(match) >= 2 {
if until := match[1]; until < len(extract) {
extract = extract[:until]
return extract, true
}
}
}
return extract, len(extract) > 0 && extract[len(extract)-1] == ' '
}
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