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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 parser
import (
"fmt"
"io"
"math"
"regexp"
"strings"
"maunium.net/go/gomatrix"
"maunium.net/go/gomuks/debug"
"maunium.net/go/gomuks/lib/htmlparser"
"maunium.net/go/gomuks/matrix/rooms"
"maunium.net/go/gomuks/ui/messages/tstring"
"maunium.net/go/gomuks/ui/widget"
"maunium.net/go/tcell"
)
var matrixToURL = regexp.MustCompile("^(?:https?://)?(?:www\\.)?matrix\\.to/#/([#@!].*)")
type MatrixHTMLProcessor struct {
text tstring.TString
indent string
listType string
lineIsNew bool
openTags *TagArray
room *rooms.Room
}
func (parser *MatrixHTMLProcessor) newline() {
if !parser.lineIsNew {
parser.text = parser.text.Append("\n" + parser.indent)
parser.lineIsNew = true
}
}
func (parser *MatrixHTMLProcessor) Preprocess() {}
func (parser *MatrixHTMLProcessor) HandleText(text string) {
style := tcell.StyleDefault
for _, tag := range *parser.openTags {
switch tag.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)
case "a":
tag.Text += text
return
}
}
if !parser.openTags.Has("pre", "code") {
text = strings.Replace(text, "\n", "", -1)
}
parser.text = parser.text.AppendStyle(text, style)
parser.lineIsNew = false
}
func (parser *MatrixHTMLProcessor) HandleStartTag(tagName string, attrs map[string]string) {
tag := &TagWithMeta{Tag: tagName}
switch tag.Tag {
case "h1", "h2", "h3", "h4", "h5", "h6":
length := int(tag.Tag[1] - '0')
parser.text = parser.text.Append(strings.Repeat("#", length) + " ")
parser.lineIsNew = false
case "a":
tag.Meta, _ = attrs["href"]
case "ol", "ul":
parser.listType = tag.Tag
case "li":
indentSize := 2
if parser.listType == "ol" {
list := parser.openTags.Get(parser.listType)
list.Counter++
parser.text = parser.text.Append(fmt.Sprintf("%d. ", list.Counter))
indentSize = int(math.Log10(float64(list.Counter))+1) + len(". ")
} else {
parser.text = parser.text.Append("* ")
}
parser.indent += strings.Repeat(" ", indentSize)
parser.lineIsNew = false
case "blockquote":
parser.indent += "> "
parser.text = parser.text.Append("> ")
parser.lineIsNew = false
}
parser.openTags.PushMeta(tag)
}
func (parser *MatrixHTMLProcessor) HandleSelfClosingTag(tagName string, attrs map[string]string) {
if tagName == "br" {
parser.newline()
}
}
func (parser *MatrixHTMLProcessor) HandleEndTag(tagName string) {
tag := parser.openTags.Pop(tagName)
switch tag.Tag {
case "li", "blockquote":
indentSize := 2
if tag.Tag == "li" && parser.listType == "ol" {
list := parser.openTags.Get(parser.listType)
indentSize = int(math.Log10(float64(list.Counter))+1) + len(". ")
}
if len(parser.indent) >= indentSize {
parser.indent = parser.indent[0 : len(parser.indent)-indentSize]
}
// TODO this newline is sometimes not good
parser.newline()
case "a":
match := matrixToURL.FindStringSubmatch(tag.Meta)
if len(match) == 2 {
pillTarget := match[1]
if pillTarget[0] == '@' {
if member := parser.room.GetMember(pillTarget); member != nil {
parser.text = parser.text.AppendColor(member.DisplayName, widget.GetHashColor(member.DisplayName))
} else {
parser.text = parser.text.Append(pillTarget)
}
} else {
parser.text = parser.text.Append(pillTarget)
}
} else {
// TODO make text clickable rather than printing URL
parser.text = parser.text.Append(fmt.Sprintf("%s (%s)", tag.Text, tag.Meta))
}
parser.lineIsNew = false
case "p", "pre", "ol", "ul", "h1", "h2", "h3", "h4", "h5", "h6", "div":
// parser.newline()
}
}
func (parser *MatrixHTMLProcessor) ReceiveError(err error) {
if err != io.EOF {
debug.Print("Unexpected error parsing HTML:", err)
}
}
func (parser *MatrixHTMLProcessor) Postprocess() {
if len(parser.text) > 0 && parser.text[len(parser.text)-1].Char == '\n' {
parser.text = parser.text[:len(parser.text)-1]
}
}
// ParseHTMLMessage parses a HTML-formatted Matrix event into a UIMessage.
func ParseHTMLMessage(room *rooms.Room, evt *gomatrix.Event) tstring.TString {
htmlData, _ := evt.Content["formatted_body"].(string)
processor := &MatrixHTMLProcessor{
room: room,
text: tstring.NewBlankTString(),
indent: "",
listType: "",
lineIsNew: true,
openTags: &TagArray{},
}
parser := htmlparser.NewHTMLParserFromString(htmlData, processor)
parser.Process()
return processor.text
}
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