gomuks/ui/messages/htmlmessage.go

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// gomuks - A terminal Matrix client written in Go.
// Copyright (C) 2019 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 messages
import (
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"fmt"
"strings"
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"time"
"github.com/mattn/go-runewidth"
"maunium.net/go/gomuks/config"
"maunium.net/go/gomuks/ui/widget"
"maunium.net/go/mautrix"
"maunium.net/go/mauview"
"maunium.net/go/tcell"
)
type HTMLMessage struct {
BaseMessage
Root *HTMLEntity
}
func NewHTMLMessage(id, sender, displayname string, msgtype mautrix.MessageType, root *HTMLEntity, timestamp time.Time) UIMessage {
return &HTMLMessage{
BaseMessage: newBaseMessage(id, sender, displayname, msgtype, timestamp),
Root: root,
}
}
func (hw *HTMLMessage) Draw(screen mauview.Screen) {
hw.Root.Draw(screen)
}
func (hw *HTMLMessage) OnKeyEvent(event mauview.KeyEvent) bool {
return false
}
func (hw *HTMLMessage) OnMouseEvent(event mauview.MouseEvent) bool {
return false
}
func (hw *HTMLMessage) OnPasteEvent(event mauview.PasteEvent) bool {
return false
}
func (hw *HTMLMessage) CalculateBuffer(preferences config.UserPreferences, width int) {
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if width <= 0 {
panic("Negative width in CalculateBuffer")
}
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// TODO account for bare messages in initial startX
startX := 0
hw.Root.calculateBuffer(width, startX, preferences.BareMessageView)
}
func (hw *HTMLMessage) Height() int {
return hw.Root.height
}
func (hw *HTMLMessage) PlainText() string {
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// FIXME
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return "Plaintext unavailable"
}
func (hw *HTMLMessage) NotificationContent() string {
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// FIXME
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return "Notification content unavailable"
}
type HTMLEntity struct {
// Permanent variables
Tag string
Text string
Style tcell.Style
Children []*HTMLEntity
Block bool
Indent int
// Non-permanent variables (calculated buffer data)
buffer []string
prevWidth int
startX int
height int
}
func (he *HTMLEntity) AdjustStyle(fn func(tcell.Style) tcell.Style) *HTMLEntity {
for _, child := range he.Children {
child.AdjustStyle(fn)
}
he.Style = fn(he.Style)
return he
}
func (he *HTMLEntity) Draw(screen mauview.Screen) {
width, _ := screen.Size()
if len(he.buffer) > 0 {
x := he.startX
for y, line := range he.buffer {
widget.WriteLine(screen, mauview.AlignLeft, line, x, y, width, he.Style)
x = 0
}
}
if len(he.Children) > 0 {
proxyScreen := &mauview.ProxyScreen{Parent: screen, OffsetX: he.Indent, Width: width - he.Indent}
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for i, entity := range he.Children {
if i != 0 && entity.startX == 0 {
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proxyScreen.OffsetY++
}
proxyScreen.Height = entity.height
entity.Draw(proxyScreen)
proxyScreen.OffsetY += entity.height - 1
}
}
}
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func (he *HTMLEntity) String() string {
var buf strings.Builder
buf.WriteString("&HTMLEntity{\n")
_, _ = fmt.Fprintf(&buf, ` Tag="%s", Style=%d, Block=%t, Indent=%d, startX=%d, height=%d,\n`,
he.Tag, he.Style, he.Block, he.Indent, he.startX, he.height)
_, _ = fmt.Fprintf(&buf, ` Buffer=["%s"]`, strings.Join(he.buffer, "\", \""))
if len(he.Text) > 0 {
buf.WriteString(",\n")
_, _ = fmt.Fprintf(&buf, ` Text="%s"`, he.Text)
}
if len(he.Children) > 0 {
buf.WriteString(",\n")
buf.WriteString(" Children={")
for _, child := range he.Children {
buf.WriteString("\n ")
buf.WriteString(strings.Join(strings.Split(strings.TrimRight(child.String(), "\n"), "\n"), "\n "))
}
buf.WriteString("\n },")
}
buf.WriteString("\n},\n")
return buf.String()
}
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func (he *HTMLEntity) calculateBuffer(width, startX int, bare bool) int {
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he.startX = startX
if he.Block {
he.startX = 0
}
he.height = 0
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if len(he.Children) > 0 {
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childStartX := he.startX
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for _, entity := range he.Children {
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if entity.Block || childStartX == 0 || he.height == 0 {
he.height++
}
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childStartX = entity.calculateBuffer(width-he.Indent, childStartX, bare)
he.height += entity.height - 1
}
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if len(he.Text) == 0 && !he.Block {
return childStartX
}
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}
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if len(he.Text) > 0 {
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he.prevWidth = width
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if he.buffer == nil {
he.buffer = []string{}
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}
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bufPtr := 0
text := he.Text
textStartX := he.startX
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for {
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extract := runewidth.Truncate(text, width-textStartX, "")
extract, wordWrapped := trim(extract, text, bare)
if !wordWrapped && textStartX > 0 {
if bufPtr < len(he.buffer) {
he.buffer[bufPtr] = ""
} else {
he.buffer = append(he.buffer, "")
}
bufPtr++
textStartX = 0
continue
}
if bufPtr < len(he.buffer) {
he.buffer[bufPtr] = extract
} else {
he.buffer = append(he.buffer, extract)
}
bufPtr++
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text = text[len(extract):]
if len(text) == 0 {
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he.buffer = he.buffer[:bufPtr]
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he.height += len(he.buffer)
// This entity is over, return the startX for the next entity
if he.Block {
// ...except if it's a block entity
return 0
}
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return textStartX + runewidth.StringWidth(extract)
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}
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textStartX = 0
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}
}
return 0
}
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func trim(extract, full string, bare bool) (string, bool) {
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if len(extract) == len(full) {
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return extract, true
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}
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]
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return extract, true
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}
}
}
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return extract, len(extract) > 0 && extract[len(extract)-1] == ' '
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}