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// gomuks - A terminal Matrix client written in Go.
// Copyright (C) 2018 Tulir Asokan
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package messages
import (
"strings"
"golang.org/x/net/html"
"maunium.net/go/gomatrix"
"maunium.net/go/gomuks/debug"
"maunium.net/go/gomuks/ui/messages/tstring"
"maunium.net/go/tcell"
)
// TagArray is a reversed queue for remembering what HTML tags are open.
type TagArray []string
// Pushb converts the given byte array into a string and calls Push().
func (ta *TagArray) Pushb(tag []byte) {
ta.Push(string(tag))
}
// Popb converts the given byte array into a string and calls Pop().
func (ta *TagArray) Popb(tag []byte) {
ta.Pop(string(tag))
}
// Hasb converts the given byte array into a string and calls Has().
func (ta *TagArray) Hasb(tag []byte) {
ta.Has(string(tag))
}
// HasAfterb converts the given byte array into a string and calls HasAfter().
func (ta *TagArray) HasAfterb(tag []byte, after int) {
ta.HasAfter(string(tag), after)
}
// Push adds the given tag to the array.
func (ta *TagArray) Push(tag string) {
*ta = append(*ta, "")
copy((*ta)[1:], *ta)
(*ta)[0] = tag
}
// Pop removes the given tag from the array.
func (ta *TagArray) Pop(tag string) {
if (*ta)[0] == tag {
// This is the default case and is lighter than append(), so we handle it separately.
*ta = (*ta)[1:]
} else if index := ta.Has(tag); index != -1 {
*ta = append((*ta)[:index], (*ta)[index+1:]...)
}
}
// Has returns the first index where the given tag is, or -1 if it's not in the list.
func (ta *TagArray) Has(tag string) int {
return ta.HasAfter(tag, -1)
}
// HasAfter returns the first index after the given index where the given tag is,
// or -1 if the given tag is not on the list after the given index.
func (ta *TagArray) HasAfter(tag string, after int) int {
for i := after + 1; i < len(*ta); i++ {
if (*ta)[i] == tag {
return i
}
}
return -1
}
// ParseHTMLMessage parses a HTML-formatted Matrix event into a UIMessage.
func ParseHTMLMessage(evt *gomatrix.Event) tstring.TString {
//textData, _ := evt.Content["body"].(string)
htmlData, _ := evt.Content["formatted_body"].(string)
z := html.NewTokenizer(strings.NewReader(htmlData))
text := tstring.NewTString("")
openTags := &TagArray{}
Loop:
for {
tt := z.Next()
switch tt {
case html.ErrorToken:
break Loop
case html.TextToken:
style := tcell.StyleDefault
for _, tag := range *openTags {
switch tag {
case "b", "strong":
style = style.Bold(true)
case "i", "em":
style = style.Italic(true)
case "s", "del":
style = style.Strikethrough(true)
case "u", "ins":
style = style.Underline(true)
}
}
text = text.AppendStyle(string(z.Text()), style)
case html.SelfClosingTagToken, html.StartTagToken:
tagb, _ := z.TagName()
tag := string(tagb)
switch tag {
case "br":
debug.Print("BR found")
debug.Print(text.String())
text = text.Append("\n")
default:
if tt == html.StartTagToken {
openTags.Push(tag)
}
}
case html.EndTagToken:
tagb, _ := z.TagName()
openTags.Popb(tagb)
}
}
return text
}
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