mirror of
https://github.com/diamondburned/cchat-gtk.git
synced 2024-12-25 05:27:23 +00:00
155 lines
3.1 KiB
Go
155 lines
3.1 KiB
Go
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package hl
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import (
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"errors"
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"fmt"
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"strings"
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"github.com/alecthomas/chroma"
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"github.com/alecthomas/chroma/lexers"
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"github.com/alecthomas/chroma/styles"
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"github.com/diamondburned/cchat-gtk/internal/ui/config"
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"github.com/diamondburned/cchat-gtk/internal/ui/rich/parser/attrmap"
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"github.com/diamondburned/cchat/text"
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)
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var (
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lexerMap = map[string]chroma.Lexer{}
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// this is not thread-safe, but we can reuse everything, as we know Gtk will
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// run everything in the main thread.
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fmtter = formatter{}
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// tokenType -> span attrs
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css = map[chroma.TokenType]string{}
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)
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func init() {
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var name = "algol_nu" // default
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ChangeStyle(name)
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config.AppearanceAdd("Code Highlight Style", config.InputEntry(&name, ChangeStyle))
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}
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func Tokenize(language, source string) chroma.Iterator {
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var lexer = getLexer(language)
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if lexer == nil {
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lexer = lexers.Fallback
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}
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i, _ := lexer.Tokenise(nil, source)
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return i
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}
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func Segments(appendmap *attrmap.AppendMap, src string, seg text.Codeblocker) {
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var start, end = seg.Bounds()
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appendmap.Span(start, end, `font_family="monospace"`)
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if i := Tokenize(seg.CodeblockLanguage(), src[start:end]); i != nil {
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fmtter.segments(appendmap, start, i)
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}
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}
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func ChangeStyle(styleName string) error {
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s := styles.Get(styleName)
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// styleName == "" => no highlighting, not an error
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if s == styles.Fallback && styleName != "" {
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return errors.New("Unknown style")
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}
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css = styleToCSS(s)
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return nil
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}
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func getLexer(lang string) chroma.Lexer {
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v, ok := lexerMap[lang]
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if ok {
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return v
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}
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v = lexers.Get(lang)
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if v != nil {
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lexerMap[lang] = v
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return v
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}
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return nil
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}
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// Formatter that generates Pango markup.
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type formatter struct {
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highlightRanges [][2]int
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}
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func (f *formatter) reset() {
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f.highlightRanges = f.highlightRanges[:0]
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}
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func (f *formatter) segments(appendmap *attrmap.AppendMap, offset int, iter chroma.Iterator) {
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f.reset()
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for _, token := range iter.Tokens() {
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attr := f.styleAttr(token.Type)
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if attr != "" {
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appendmap.Addf(offset, `<span %s>`, attr)
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}
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offset += len(token.Value)
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if attr != "" {
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appendmap.Add(offset, "</span>")
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}
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}
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}
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func (f *formatter) styleAttr(tt chroma.TokenType) string {
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if _, ok := css[tt]; !ok {
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tt = tt.SubCategory()
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}
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if _, ok := css[tt]; !ok {
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tt = tt.Category()
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}
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if t, ok := css[tt]; ok {
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return t
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}
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return ""
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}
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func styleToCSS(style *chroma.Style) map[chroma.TokenType]string {
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classes := map[chroma.TokenType]string{}
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bg := style.Get(chroma.Background)
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for t := range chroma.StandardTypes {
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var entry = style.Get(t)
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if t != chroma.Background {
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entry = entry.Sub(bg)
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}
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if entry.IsZero() {
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continue
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}
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classes[t] = styleEntryToTag(entry)
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}
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return classes
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}
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func styleEntryToTag(e chroma.StyleEntry) string {
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var attrs = make([]string, 0, 1)
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if e.Colour.IsSet() {
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attrs = append(attrs, fmt.Sprintf(`foreground="%s"`, e.Colour.String()))
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}
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if e.Bold == chroma.Yes {
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attrs = append(attrs, `weight="bold"`)
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}
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if e.Italic == chroma.Yes {
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attrs = append(attrs, `style="italic"`)
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}
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if e.Underline == chroma.Yes {
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attrs = append(attrs, `underline="single"`)
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}
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return strings.Join(attrs, " ")
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}
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