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svg: fixed text background rectangles

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- location and size looks fine now even when scaled and with larger files (used `em` for line height and `ch` for
width)
- svg width/height looks ok now, width has some problems on scaling (seems this needs to be a unit like `px` and cannot be `ch` so it's a rough estimate)
- updated liberation mono font to 2.00.5 since the current one had wrong width for the full block character (https://github.com/liberationfonts/liberation-fonts)
This commit is contained in:
rsteube 2019-10-16 11:25:29 +02:00 committed by Alec Thomas
parent 611a24ccdd
commit aaa94ce97c
2 changed files with 18 additions and 4 deletions
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2
formatters/svg/font_liberation_mono.go
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File diff suppressed because one or more lines are too long

20
formatters/svg/svg.go
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@ -91,7 +91,7 @@ func (f *Formatter) writeSVG(w io.Writer, style *chroma.Style, tokens []chroma.T
fmt.Fprint(w, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n")
fmt.Fprint(w, "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.0//EN\" \"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd\">\n")
fmt.Fprintf(w, "<svg height=\"%d\" xmlns=\"http://www.w3.org/2000/svg\">\n", len(lines)*22)
fmt.Fprintf(w, "<svg width=\"%dpx\" height=\"%dpx\" xmlns=\"http://www.w3.org/2000/svg\">\n", 8*maxLineWidth(lines), 10+int(16.8*float64(len(lines)+1)))
if f.embeddedFont != "" {
f.writeFontStyle(w)
@ -103,7 +103,7 @@ func (f *Formatter) writeSVG(w io.Writer, style *chroma.Style, tokens []chroma.T
f.writeTokenBackgrounds(w, lines, style)
for index, tokens := range lines {
fmt.Fprintf(w, "<text x=\"0\" y=\"%d\" xml:space=\"preserve\">", (14+7)*(index+1))
fmt.Fprintf(w, "<text x=\"0\" y=\"%fem\" xml:space=\"preserve\">", 1.2*float64(index+1))
for _, token := range tokens {
text := escapeString(token.String())
@ -120,6 +120,20 @@ func (f *Formatter) writeSVG(w io.Writer, style *chroma.Style, tokens []chroma.T
fmt.Fprint(w, "</svg>\n")
}
func maxLineWidth(lines [][]chroma.Token) int {
maxWidth := 0
for _, tokens := range lines {
length := 0
for _, token := range tokens {
length += len(strings.Replace(token.String(), ` `, " ", -1))
}
if length > maxWidth {
maxWidth = length
}
}
return maxWidth
}
// There is no background attribute for text in SVG so simply calculate the position and text
// of tokens with a background color that differs from the default and add a rectangle for each before
// adding the token.
@ -130,7 +144,7 @@ func (f *Formatter) writeTokenBackgrounds(w io.Writer, lines [][]chroma.Token, s
length := len(strings.Replace(token.String(), ` `, " ", -1))
tokenBackground := style.Get(token.Type).Background
if tokenBackground.IsSet() && tokenBackground != style.Get(chroma.Background).Background {
fmt.Fprintf(w, "<rect id=\"%s\" x=\"%d\" y=\"%d\" width=\"%d\" height=\"%d\" fill=\"%s\" />\n", escapeString(token.String()), lineLength*8, (14+7)*index+7, length*8, 14, style.Get(token.Type).Background.String())
fmt.Fprintf(w, "<rect id=\"%s\" x=\"%dch\" y=\"%fem\" width=\"%dch\" height=\"1.2em\" fill=\"%s\" />\n", escapeString(token.String()), lineLength, 1.2*float64(index)+0.25, length, style.Get(token.Type).Background.String())
}
lineLength += length
}