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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| package viewport | ||
|
|
||
| import ( | ||
| "github.com/charmbracelet/lipgloss/v2" | ||
| "github.com/charmbracelet/x/ansi" | ||
| "github.com/rivo/uniseg" | ||
| ) | ||
|
|
||
| // parseMatches converts the given matches into highlight ranges. | ||
| // | ||
| // Assumptions: | ||
| // - matches are measured in bytes, e.g. what [regex.FindAllStringIndex] would return | ||
| // - matches were made against the given content | ||
| // - matches are in order | ||
| // - matches do not overlap | ||
| // - content is line terminated with \n only | ||
| // | ||
| // We'll then convert the ranges into [highlightInfo]s, which hold the starting | ||
| // line and the grapheme positions. | ||
| func parseMatches( | ||
| content string, | ||
| matches [][]int, | ||
| ) []highlightInfo { | ||
| if len(matches) == 0 { | ||
| return nil | ||
| } | ||
|
|
||
| line := 0 | ||
| graphemePos := 0 | ||
| previousLinesOffset := 0 | ||
| bytePos := 0 | ||
|
|
||
| highlights := make([]highlightInfo, 0, len(matches)) | ||
| gr := uniseg.NewGraphemes(ansi.Strip(content)) | ||
|
|
||
| for _, match := range matches { | ||
| byteStart, byteEnd := match[0], match[1] | ||
|
|
||
| // hilight for this match: | ||
| hi := highlightInfo{ | ||
| lines: map[int][2]int{}, | ||
| } | ||
|
|
||
| // find the beginning of this byte range, setup current line and | ||
| // grapheme position. | ||
| for byteStart > bytePos { | ||
| if !gr.Next() { | ||
| break | ||
| } | ||
| if content[bytePos] == '\n' { | ||
| previousLinesOffset = graphemePos + 1 | ||
| line++ | ||
| } | ||
| graphemePos += max(1, gr.Width()) | ||
| bytePos += len(gr.Str()) | ||
| } | ||
|
|
||
| hi.lineStart = line | ||
| hi.lineEnd = line | ||
|
|
||
| graphemeStart := graphemePos | ||
|
|
||
| // loop until we find the end | ||
| for byteEnd > bytePos { | ||
| if !gr.Next() { | ||
| break | ||
| } | ||
|
|
||
| // if it ends with a new line, add the range, increase line, and continue | ||
| if content[bytePos] == '\n' { | ||
| colstart := max(0, graphemeStart-previousLinesOffset) | ||
| colend := max(graphemePos-previousLinesOffset+1, colstart) // +1 its \n itself | ||
|
|
||
| if colend > colstart { | ||
| hi.lines[line] = [2]int{colstart, colend} | ||
| hi.lineEnd = line | ||
| } | ||
|
|
||
| previousLinesOffset = graphemePos + 1 | ||
| line++ | ||
| } | ||
|
|
||
| graphemePos += max(1, gr.Width()) | ||
| bytePos += len(gr.Str()) | ||
| } | ||
|
|
||
| // we found it!, add highlight and continue | ||
| if bytePos == byteEnd { | ||
| colstart := max(0, graphemeStart-previousLinesOffset) | ||
| colend := max(graphemePos-previousLinesOffset, colstart) | ||
|
|
||
| if colend > colstart { | ||
| hi.lines[line] = [2]int{colstart, colend} | ||
| hi.lineEnd = line | ||
| } | ||
| } | ||
|
|
||
| highlights = append(highlights, hi) | ||
| } | ||
|
|
||
| return highlights | ||
| } | ||
|
|
||
| type highlightInfo struct { | ||
| // in which line this highlight starts and ends | ||
| lineStart, lineEnd int | ||
|
|
||
| // the grapheme highlight ranges for each of these lines | ||
| lines map[int][2]int | ||
| } | ||
|
|
||
| // coords returns the line x column of this highlight. | ||
| func (hi highlightInfo) coords() (int, int, int) { | ||
| for i := hi.lineStart; i <= hi.lineEnd; i++ { | ||
| hl, ok := hi.lines[i] | ||
| if !ok { | ||
| continue | ||
| } | ||
| return i, hl[0], hl[1] | ||
| } | ||
| return hi.lineStart, 0, 0 | ||
| } | ||
|
|
||
| func makeHighlightRanges( | ||
| highlights []highlightInfo, | ||
| line int, | ||
| style lipgloss.Style, | ||
| ) []lipgloss.Range { | ||
| result := []lipgloss.Range{} | ||
| for _, hi := range highlights { | ||
| lihi, ok := hi.lines[line] | ||
| if !ok { | ||
| continue | ||
| } | ||
| if lihi == [2]int{} { | ||
| continue | ||
| } | ||
| result = append(result, lipgloss.NewRange(lihi[0], lihi[1], style)) | ||
| } | ||
| return result | ||
| } |
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