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package lipgloss
import (
"strings"
"github.com/charmbracelet/x/ansi"
)
// StyleRanges allows to, given a string, style ranges of it differently.
// The function will take into account existing styles.
// Ranges should not overlap.
func StyleRanges(s string, ranges ...Range) string {
if len(ranges) == 0 {
return s
}
var buf strings.Builder
lastIdx := 0
stripped := ansi.Strip(s)
// Use Truncate and TruncateLeft to style match.MatchedIndexes without
// losing the original option style:
for _, rng := range ranges {
// Add the text before this match
if rng.Start > lastIdx {
buf.WriteString(ansi.Cut(s, lastIdx, rng.Start))
}
// Add the matched range with its highlight
buf.WriteString(rng.Style.Render(ansi.Cut(stripped, rng.Start, rng.End)))
lastIdx = rng.End
}
// Add any remaining text after the last match
buf.WriteString(ansi.TruncateLeft(s, lastIdx, ""))
return buf.String()
}
// NewRange returns a range that can be used with [StyleRanges].
func NewRange(start, end int, style Style) Range {
return Range{start, end, style}
}
// Range to be used with [StyleRanges].
type Range struct {
Start, End int
Style Style
}
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