Rewrite HTML parser
This commit is contained in:
Tulir Asokan
parent
e604346211
commit
1da02e3a13
@ -1,3 +0,0 @@
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// Package htmlparser contains a HTML parsing system similar to html.parser.HTMLParser in Python 3.
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// The parser uses x/net/html.Tokenizer in the background.
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package htmlparser
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@ -1,142 +0,0 @@
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// gomuks - A terminal Matrix client written in Go.
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// Copyright (C) 2018 Tulir Asokan
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package htmlparser
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import (
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"io"
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"strings"
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"golang.org/x/net/html"
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)
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// HTMLProcessor contains the functions to process parsed HTML data.
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type HTMLProcessor interface {
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// Preprocess is called before the parsing is started.
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Preprocess()
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// HandleStartTag is called with the tag name and attributes when
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// the parser encounters a StartTagToken, except if the tag is
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// always self-closing.
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HandleStartTag(tagName string, attrs map[string]string)
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// HandleSelfClosingTag is called with the tag name and attributes
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// when the parser encounters a SelfClosingTagToken OR a StartTagToken
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// with a tag that's always self-closing.
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HandleSelfClosingTag(tagName string, attrs map[string]string)
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// HandleText is called with the text when the parser encounters
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// a TextToken.
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HandleText(text string)
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// HandleEndTag is called with the tag name when the parser encounters
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// an EndTagToken.
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HandleEndTag(tagName string)
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// ReceiveError is called with the error when the parser encounters
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// an ErrorToken that IS NOT io.EOF.
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ReceiveError(err error)
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// Postprocess is called after parsing is completed successfully.
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// An unsuccessful parsing will trigger a ReceiveError() call.
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Postprocess()
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}
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// HTMLParser wraps a net/html.Tokenizer and a HTMLProcessor to call
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// the HTMLProcessor with data from the Tokenizer.
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type HTMLParser struct {
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*html.Tokenizer
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processor HTMLProcessor
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}
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// NewHTMLParserFromTokenizer creates a new HTMLParser from an existing html Tokenizer.
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func NewHTMLParserFromTokenizer(z *html.Tokenizer, processor HTMLProcessor) HTMLParser {
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return HTMLParser{
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z,
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processor,
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}
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}
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// NewHTMLParserFromReader creates a Tokenizer with the given io.Reader and
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// then uses that to create a new HTMLParser.
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func NewHTMLParserFromReader(reader io.Reader, processor HTMLProcessor) HTMLParser {
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return NewHTMLParserFromTokenizer(html.NewTokenizer(reader), processor)
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}
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// NewHTMLParserFromString creates a Tokenizer with a reader of the given
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// string and then uses that to create a new HTMLParser.
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func NewHTMLParserFromString(html string, processor HTMLProcessor) HTMLParser {
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return NewHTMLParserFromReader(strings.NewReader(html), processor)
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}
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// SelfClosingTags is the list of tags that always call
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// HTMLProcessor.HandleSelfClosingTag() even if it is encountered
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// as a html.StartTagToken rather than html.SelfClosingTagToken.
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var SelfClosingTags = []string{"img", "br", "hr", "area", "base", "basefont", "input", "link", "meta"}
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func (parser HTMLParser) mapAttrs() map[string]string {
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attrs := make(map[string]string)
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hasMore := true
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for hasMore {
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var key, val []byte
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key, val, hasMore = parser.TagAttr()
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attrs[string(key)] = string(val)
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}
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return attrs
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}
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func (parser HTMLParser) isSelfClosing(tag string) bool {
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for _, selfClosingTag := range SelfClosingTags {
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if tag == selfClosingTag {
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return true
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}
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}
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return false
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}
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// Process parses the HTML using the tokenizer in this parser and
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// calls the appropriate functions of the HTML processor.
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func (parser HTMLParser) Process() {
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parser.processor.Preprocess()
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Loop:
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for {
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tt := parser.Next()
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switch tt {
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case html.ErrorToken:
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if parser.Err() != io.EOF {
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parser.processor.ReceiveError(parser.Err())
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return
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}
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break Loop
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case html.TextToken:
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parser.processor.HandleText(string(parser.Text()))
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case html.StartTagToken, html.SelfClosingTagToken:
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tagb, _ := parser.TagName()
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attrs := parser.mapAttrs()
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tag := string(tagb)
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selfClosing := tt == html.SelfClosingTagToken || parser.isSelfClosing(tag)
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if selfClosing {
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parser.processor.HandleSelfClosingTag(tag, attrs)
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} else {
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parser.processor.HandleStartTag(tag, attrs)
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}
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case html.EndTagToken:
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tagb, _ := parser.TagName()
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parser.processor.HandleEndTag(string(tagb))
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}
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}
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parser.processor.Postprocess()
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}
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@ -18,185 +18,240 @@ package parser
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import (
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"fmt"
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"io"
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"math"
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"regexp"
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"strings"
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"maunium.net/go/gomatrix"
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"maunium.net/go/gomuks/debug"
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"maunium.net/go/gomuks/lib/htmlparser"
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"maunium.net/go/gomuks/matrix/rooms"
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"maunium.net/go/gomuks/ui/messages/tstring"
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"maunium.net/go/gomuks/ui/widget"
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"maunium.net/go/tcell"
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"golang.org/x/net/html"
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)
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var matrixToURL = regexp.MustCompile("^(?:https?://)?(?:www\\.)?matrix\\.to/#/([#@!].*)")
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type MatrixHTMLProcessor struct {
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text tstring.TString
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senderID string
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sender string
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msgtype string
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indent string
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listType string
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lineIsNew bool
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openTags *TagArray
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type htmlParser struct {
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room *rooms.Room
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}
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func (parser *MatrixHTMLProcessor) newline() {
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if !parser.lineIsNew {
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parser.text = parser.text.Append("\n" + parser.indent)
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parser.lineIsNew = true
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}
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type taggedTString struct {
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tstring.TString
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tag string
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}
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func (parser *MatrixHTMLProcessor) Preprocess() {
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if parser.msgtype == "m.emote" {
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parser.text = tstring.NewColorTString(fmt.Sprintf("* %s ", parser.sender), widget.GetHashColor(parser.senderID))
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}
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var AdjustStyleBold = func(style tcell.Style) tcell.Style {
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return style.Bold(true)
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}
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func (parser *MatrixHTMLProcessor) HandleText(text string) {
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style := tcell.StyleDefault
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for _, tag := range *parser.openTags {
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switch tag.Tag {
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case "b", "strong":
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style = style.Bold(true)
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case "i", "em":
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style = style.Italic(true)
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case "s", "del":
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style = style.Strikethrough(true)
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case "u", "ins":
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style = style.Underline(true)
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case "a":
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tag.Text += text
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return
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}
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}
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if !parser.openTags.Has("pre", "code") {
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text = strings.Replace(text, "\n", "", -1)
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}
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parser.text = parser.text.AppendStyle(text, style)
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parser.lineIsNew = false
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var AdjustStyleItalic = func(style tcell.Style) tcell.Style {
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return style.Italic(true)
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}
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func (parser *MatrixHTMLProcessor) HandleStartTag(tagName string, attrs map[string]string) {
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tag := &TagWithMeta{Tag: tagName}
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switch tag.Tag {
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case "h1", "h2", "h3", "h4", "h5", "h6":
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length := int(tag.Tag[1] - '0')
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parser.text = parser.text.Append(strings.Repeat("#", length) + " ")
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parser.lineIsNew = false
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case "a":
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tag.Meta, _ = attrs["href"]
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case "ol", "ul":
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parser.listType = tag.Tag
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case "li":
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indentSize := 2
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if parser.listType == "ol" {
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list := parser.openTags.Get(parser.listType)
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list.Counter++
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parser.text = parser.text.Append(fmt.Sprintf("%d. ", list.Counter))
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indentSize = int(math.Log10(float64(list.Counter))+1) + len(". ")
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var AdjustStyleUnderline = func(style tcell.Style) tcell.Style {
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return style.Underline(true)
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}
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var AdjustStyleStrikethrough = func(style tcell.Style) tcell.Style {
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return style.Strikethrough(true)
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}
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func (parser *htmlParser) listToTString(node *html.Node, stripLinebreak bool) tstring.TString {
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ordered := node.Data == "ol"
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taggedChildren := parser.nodeToTaggedTStrings(node.FirstChild, stripLinebreak)
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paddingLength := 0
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if ordered {
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paddingLength = int(math.Floor(math.Log10(float64(len(taggedChildren)))) + 1)
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}
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padding := strings.Repeat(" ", paddingLength+2)
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var children []tstring.TString
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counter := 1
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for _, child := range taggedChildren {
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if child.tag != "li" {
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continue
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}
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var prefix string
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if ordered {
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prefix = fmt.Sprintf("%*d. ", paddingLength, counter)
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} else {
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parser.text = parser.text.Append("* ")
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prefix = "● "
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}
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parser.indent += strings.Repeat(" ", indentSize)
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parser.lineIsNew = false
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case "blockquote":
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parser.indent += "> "
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parser.text = parser.text.Append("> ")
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parser.lineIsNew = false
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str := child.TString.Prepend(prefix)
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counter++
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parts := str.Split('\n')
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for i, part := range parts[1:] {
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parts[i+1] = part.Prepend(padding)
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}
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parser.openTags.PushMeta(tag)
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str = tstring.Join(parts, "\n")
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children = append(children, str)
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}
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return tstring.Join(children, "\n")
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}
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func (parser *MatrixHTMLProcessor) HandleSelfClosingTag(tagName string, attrs map[string]string) {
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if tagName == "br" {
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parser.newline()
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func (parser *htmlParser) basicFormatToTString(node *html.Node, stripLinebreak bool) tstring.TString {
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str := parser.nodeToTagAwareTString(node.FirstChild, stripLinebreak)
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switch node.Data {
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case "b", "strong":
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str.AdjustStyleFull(AdjustStyleBold)
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case "i", "em":
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str.AdjustStyleFull(AdjustStyleItalic)
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case "s", "del":
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str.AdjustStyleFull(AdjustStyleStrikethrough)
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case "u", "ins":
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str.AdjustStyleFull(AdjustStyleUnderline)
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}
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return str
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}
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func (parser *MatrixHTMLProcessor) HandleEndTag(tagName string) {
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tag := parser.openTags.Pop(tagName)
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if tag == nil {
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return
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}
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func (parser *htmlParser) headerToTString(node *html.Node, stripLinebreak bool) tstring.TString {
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children := parser.nodeToTStrings(node.FirstChild, stripLinebreak)
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length := int(node.Data[1] - '0')
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prefix := strings.Repeat("#", length) + " "
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return tstring.Join(children, "").Prepend(prefix)
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}
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switch tag.Tag {
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case "li", "blockquote":
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indentSize := 2
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if tag.Tag == "li" && parser.listType == "ol" {
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list := parser.openTags.Get(parser.listType)
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indentSize = int(math.Log10(float64(list.Counter))+1) + len(". ")
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func (parser *htmlParser) blockquoteToTString(node *html.Node, stripLinebreak bool) tstring.TString {
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str := parser.nodeToTagAwareTString(node.FirstChild, stripLinebreak)
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childrenArr := str.TrimSpace().Split('\n')
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for index, child := range childrenArr {
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childrenArr[index] = child.Prepend("> ")
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}
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if len(parser.indent) >= indentSize {
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parser.indent = parser.indent[0 : len(parser.indent)-indentSize]
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return tstring.Join(childrenArr, "\n")
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}
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func (parser *htmlParser) linkToTString(node *html.Node, stripLinebreak bool) tstring.TString {
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str := parser.nodeToTagAwareTString(node.FirstChild, stripLinebreak)
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var href string
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for _, attr := range node.Attr {
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if attr.Key == "href" {
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href = attr.Val
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break
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}
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// TODO this newline is sometimes not good
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parser.newline()
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case "a":
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match := matrixToURL.FindStringSubmatch(tag.Meta)
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}
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if len(href) == 0 {
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return str
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}
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match := matrixToURL.FindStringSubmatch(href)
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if len(match) == 2 {
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pillTarget := match[1]
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if pillTarget[0] == '@' {
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if member := parser.room.GetMember(pillTarget); member != nil {
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parser.text = parser.text.AppendColor(member.DisplayName, widget.GetHashColor(member.UserID))
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} else {
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parser.text = parser.text.Append(pillTarget)
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return tstring.NewColorTString(member.DisplayName, widget.GetHashColor(member.UserID))
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}
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} else {
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parser.text = parser.text.Append(pillTarget)
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}
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} else {
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// TODO make text clickable rather than printing URL
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parser.text = parser.text.Append(fmt.Sprintf("%s (%s)", tag.Text, tag.Meta))
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return tstring.NewTString(pillTarget)
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}
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parser.lineIsNew = false
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case "p", "pre", "ol", "ul", "h1", "h2", "h3", "h4", "h5", "h6", "div":
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// parser.newline()
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return str.Append(fmt.Sprintf(" (%s)", href))
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}
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func (parser *htmlParser) tagToTString(node *html.Node, stripLinebreak bool) tstring.TString {
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switch node.Data {
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case "blockquote":
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return parser.blockquoteToTString(node, stripLinebreak)
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case "ol", "ul":
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return parser.listToTString(node, stripLinebreak)
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case "h1", "h2", "h3", "h4", "h5", "h6":
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return parser.headerToTString(node, stripLinebreak)
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case "br":
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return tstring.NewTString("\n")
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case "b", "strong", "i", "em", "s", "del", "u", "ins":
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return parser.basicFormatToTString(node, stripLinebreak)
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case "a":
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return parser.linkToTString(node, stripLinebreak)
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case "p":
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return parser.nodeToTagAwareTString(node.FirstChild, stripLinebreak).Append("\n")
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case "pre":
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return parser.nodeToTString(node.FirstChild, false)
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default:
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return parser.nodeToTagAwareTString(node.FirstChild, stripLinebreak)
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}
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}
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func (parser *MatrixHTMLProcessor) ReceiveError(err error) {
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if err != io.EOF {
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debug.Print("Unexpected error parsing HTML:", err)
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func (parser *htmlParser) singleNodeToTString(node *html.Node, stripLinebreak bool) taggedTString {
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switch node.Type {
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case html.TextNode:
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if stripLinebreak {
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node.Data = strings.Replace(node.Data, "\n", "", -1)
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}
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return taggedTString{tstring.NewTString(node.Data), "text"}
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case html.ElementNode:
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return taggedTString{parser.tagToTString(node, stripLinebreak), node.Data}
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case html.DocumentNode:
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return taggedTString{parser.nodeToTagAwareTString(node.FirstChild, stripLinebreak), "html"}
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default:
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return taggedTString{tstring.NewBlankTString(), "unknown"}
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}
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}
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func (parser *MatrixHTMLProcessor) Postprocess() {
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if len(parser.text) > 0 && parser.text[len(parser.text)-1].Char == '\n' {
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parser.text = parser.text[:len(parser.text)-1]
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func (parser *htmlParser) nodeToTaggedTStrings(node *html.Node, stripLinebreak bool) (strs []taggedTString) {
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for ; node != nil; node = node.NextSibling {
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strs = append(strs, parser.singleNodeToTString(node, stripLinebreak))
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}
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return
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}
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var BlockTags = []string{"p", "h1", "h2", "h3", "h4", "h5", "h6", "ol", "ul", "pre", "blockquote", "div", "hr", "table"}
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func (parser *htmlParser) isBlockTag(tag string) bool {
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for _, blockTag := range BlockTags {
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if tag == blockTag {
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return true
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}
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}
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return false
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}
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func (parser *htmlParser) nodeToTagAwareTString(node *html.Node, stripLinebreak bool) tstring.TString {
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strs := parser.nodeToTaggedTStrings(node, stripLinebreak)
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output := tstring.NewBlankTString()
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for i, str := range strs {
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tstr := str.TString
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curIsBlock := parser.isBlockTag(str.tag)
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if i > 0 && curIsBlock {
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tstr = tstr.Prepend("\n")
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}
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if curIsBlock && len(strs) < i+1 {
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tstr = tstr.Append("\n")
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}
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output = output.AppendTString(tstr)
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}
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return output.TrimSpace()
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}
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|
||||
func (parser *htmlParser) nodeToTStrings(node *html.Node, stripLinebreak bool) (strs []tstring.TString) {
|
||||
for ; node != nil; node = node.NextSibling {
|
||||
strs = append(strs, parser.singleNodeToTString(node, stripLinebreak).TString)
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func (parser *htmlParser) nodeToTString(node *html.Node, stripLinebreak bool) tstring.TString {
|
||||
return tstring.Join(parser.nodeToTStrings(node, stripLinebreak), "")
|
||||
}
|
||||
|
||||
func (parser *htmlParser) Parse(htmlData string) tstring.TString {
|
||||
node, _ := html.Parse(strings.NewReader(htmlData))
|
||||
return parser.nodeToTagAwareTString(node, true)
|
||||
}
|
||||
|
||||
// ParseHTMLMessage parses a HTML-formatted Matrix event into a UIMessage.
|
||||
func ParseHTMLMessage(room *rooms.Room, evt *gomatrix.Event, senderDisplayname string) tstring.TString {
|
||||
htmlData, _ := evt.Content["formatted_body"].(string)
|
||||
htmlData = strings.Replace(htmlData, "\t", " ", -1)
|
||||
msgtype, _ := evt.Content["msgtype"].(string)
|
||||
|
||||
processor := &MatrixHTMLProcessor{
|
||||
room: room,
|
||||
text: tstring.NewBlankTString(),
|
||||
msgtype: msgtype,
|
||||
senderID: evt.Sender,
|
||||
sender: senderDisplayname,
|
||||
indent: "",
|
||||
listType: "",
|
||||
lineIsNew: true,
|
||||
openTags: &TagArray{},
|
||||
parser := htmlParser{room}
|
||||
str := parser.Parse(htmlData)
|
||||
|
||||
msgtype, _ := evt.Content["msgtype"].(string)
|
||||
if msgtype == "m.emote" {
|
||||
str = tstring.Join([]tstring.TString{
|
||||
tstring.NewTString("* "),
|
||||
tstring.NewColorTString(senderDisplayname, widget.GetHashColor(evt.Sender)),
|
||||
tstring.NewTString(" "),
|
||||
str,
|
||||
}, "")
|
||||
}
|
||||
|
||||
parser := htmlparser.NewHTMLParserFromString(htmlData, processor)
|
||||
parser.Process()
|
||||
|
||||
return processor.text
|
||||
return str
|
||||
}
|
||||
|
||||
@ -1,100 +0,0 @@
|
||||
// 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
|
||||
|
||||
// TagWithMeta is an open HTML tag with some metadata (e.g. list index, a href value).
|
||||
type TagWithMeta struct {
|
||||
Tag string
|
||||
Counter int
|
||||
Meta string
|
||||
Text string
|
||||
}
|
||||
|
||||
// BlankTag is a blank TagWithMeta object.
|
||||
var BlankTag = &TagWithMeta{}
|
||||
|
||||
// TagArray is a reversed queue for remembering what HTML tags are open.
|
||||
type TagArray []*TagWithMeta
|
||||
|
||||
// Push adds the given tag to the array.
|
||||
func (ta *TagArray) Push(tag string) {
|
||||
ta.PushMeta(&TagWithMeta{Tag: tag})
|
||||
}
|
||||
|
||||
// PushMeta adds the given tag to the array.
|
||||
func (ta *TagArray) PushMeta(tag *TagWithMeta) {
|
||||
*ta = append(*ta, BlankTag)
|
||||
copy((*ta)[1:], *ta)
|
||||
(*ta)[0] = tag
|
||||
}
|
||||
|
||||
// Pop removes the given tag from the array.
|
||||
func (ta *TagArray) Pop(tag string) (removed *TagWithMeta) {
|
||||
if len(*ta) == 0 {
|
||||
return
|
||||
} else if (*ta)[0].Tag == tag {
|
||||
// This is the default case and is lighter than append(), so we handle it separately.
|
||||
removed = (*ta)[0]
|
||||
*ta = (*ta)[1:]
|
||||
} else if index := ta.Index(tag); index != -1 {
|
||||
removed = (*ta)[index]
|
||||
*ta = append((*ta)[:index], (*ta)[index+1:]...)
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
// Index returns the first index where the given tag is, or -1 if it's not in the list.
|
||||
func (ta *TagArray) Index(tag string) int {
|
||||
return ta.IndexAfter(tag, -1)
|
||||
}
|
||||
|
||||
// IndexAfter 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) IndexAfter(tag string, after int) int {
|
||||
for i := after + 1; i < len(*ta); i++ {
|
||||
if (*ta)[i].Tag == tag {
|
||||
return i
|
||||
}
|
||||
}
|
||||
return -1
|
||||
}
|
||||
|
||||
// Get returns the first occurrence of the given tag, or nil if it's not in the list.
|
||||
func (ta *TagArray) Get(tag string) *TagWithMeta {
|
||||
return ta.GetAfter(tag, -1)
|
||||
}
|
||||
|
||||
// GetAfter returns the first occurrence of the given tag, or nil if the given
|
||||
// tag is not on the list after the given index.
|
||||
func (ta *TagArray) GetAfter(tag string, after int) *TagWithMeta {
|
||||
for i := after + 1; i < len(*ta); i++ {
|
||||
if (*ta)[i].Tag == tag {
|
||||
return (*ta)[i]
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// Has returns whether or not the list has at least one of the given tags.
|
||||
func (ta *TagArray) Has(tags ...string) bool {
|
||||
for _, tag := range tags {
|
||||
if index := ta.Index(tag); index != -1 {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
@ -21,6 +21,7 @@ import (
|
||||
|
||||
"github.com/mattn/go-runewidth"
|
||||
"maunium.net/go/tcell"
|
||||
"unicode"
|
||||
)
|
||||
|
||||
type TString []Cell
|
||||
@ -53,17 +54,66 @@ func NewStyleTString(str string, style tcell.Style) TString {
|
||||
return newStr
|
||||
}
|
||||
|
||||
func (str TString) AppendTString(data TString) TString {
|
||||
return append(str, data...)
|
||||
func Join(strings []TString, separator string) TString {
|
||||
if len(strings) == 0 {
|
||||
return NewBlankTString()
|
||||
}
|
||||
|
||||
out := strings[0]
|
||||
strings = strings[1:]
|
||||
|
||||
if len(separator) == 0 {
|
||||
return out.AppendTString(strings...)
|
||||
}
|
||||
|
||||
for _, str := range strings {
|
||||
out = append(out, str.Prepend(separator)...)
|
||||
}
|
||||
return out
|
||||
}
|
||||
|
||||
func (str TString) AppendTString(dataList ...TString) TString {
|
||||
newStr := str
|
||||
for _, data := range dataList {
|
||||
newStr = append(newStr, data...)
|
||||
}
|
||||
return newStr
|
||||
}
|
||||
|
||||
func (str TString) PrependTString(data TString) TString {
|
||||
return append(data, str...)
|
||||
}
|
||||
|
||||
func (str TString) Append(data string) TString {
|
||||
newStr := make(TString, len(str)+len(data))
|
||||
copy(newStr, str)
|
||||
for i, char := range data {
|
||||
newStr[i+len(str)] = NewCell(char)
|
||||
return str.AppendCustom(data, func(r rune) Cell {
|
||||
return NewCell(r)
|
||||
})
|
||||
}
|
||||
|
||||
func (str TString) TrimSpace() TString {
|
||||
return str.Trim(unicode.IsSpace)
|
||||
}
|
||||
|
||||
func (str TString) Trim(fn func(rune) bool) TString {
|
||||
return str.TrimLeft(fn).TrimRight(fn)
|
||||
}
|
||||
|
||||
func (str TString) TrimLeft(fn func(rune) bool) TString {
|
||||
for index, cell := range str {
|
||||
if !fn(cell.Char) {
|
||||
return append(NewBlankTString(), str[index:]...)
|
||||
}
|
||||
return newStr
|
||||
}
|
||||
return NewBlankTString()
|
||||
}
|
||||
|
||||
func (str TString) TrimRight(fn func(rune) bool) TString {
|
||||
for i := len(str)-1; i >= 0; i-- {
|
||||
if !fn(str[i].Char) {
|
||||
return append(NewBlankTString(), str[:i+1]...)
|
||||
}
|
||||
}
|
||||
return NewBlankTString()
|
||||
}
|
||||
|
||||
func (str TString) AppendColor(data string, color tcell.Color) TString {
|
||||
@ -87,10 +137,47 @@ func (str TString) AppendCustom(data string, cellCreator func(rune) Cell) TStrin
|
||||
return newStr
|
||||
}
|
||||
|
||||
func (str TString) Colorize(from, length int, color tcell.Color) {
|
||||
for i := from; i < from+length; i++ {
|
||||
str[i].Style = str[i].Style.Foreground(color)
|
||||
func (str TString) Prepend(data string) TString {
|
||||
return str.PrependCustom(data, func(r rune) Cell {
|
||||
return NewCell(r)
|
||||
})
|
||||
}
|
||||
|
||||
func (str TString) PrependColor(data string, color tcell.Color) TString {
|
||||
return str.PrependCustom(data, func(r rune) Cell {
|
||||
return NewColorCell(r, color)
|
||||
})
|
||||
}
|
||||
|
||||
func (str TString) PrependStyle(data string, style tcell.Style) TString {
|
||||
return str.PrependCustom(data, func(r rune) Cell {
|
||||
return NewStyleCell(r, style)
|
||||
})
|
||||
}
|
||||
|
||||
func (str TString) PrependCustom(data string, cellCreator func(rune) Cell) TString {
|
||||
newStr := make(TString, len(str)+len(data))
|
||||
copy(newStr[len(data):], str)
|
||||
for i, char := range data {
|
||||
newStr[i] = cellCreator(char)
|
||||
}
|
||||
return newStr
|
||||
}
|
||||
|
||||
func (str TString) Colorize(from, length int, color tcell.Color) {
|
||||
str.AdjustStyle(from, length, func(style tcell.Style) tcell.Style {
|
||||
return style.Foreground(color)
|
||||
})
|
||||
}
|
||||
|
||||
func (str TString) AdjustStyle(from, length int, fn func(tcell.Style) tcell.Style) {
|
||||
for i := from; i < from+length; i++ {
|
||||
str[i].Style = fn(str[i].Style)
|
||||
}
|
||||
}
|
||||
|
||||
func (str TString) AdjustStyleFull(fn func(tcell.Style) tcell.Style) {
|
||||
str.AdjustStyle(0, len(str), fn)
|
||||
}
|
||||
|
||||
func (str TString) Draw(screen tcell.Screen, x, y int) {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user