vendor tsgo

tools/tsgo/internal/core/textchange.go

@@ -0,0 +1,30 @@
+package core
+
+import "strings"
+
+type TextChange struct {
+	TextRange
+	NewText string
+}
+
+func (t TextChange) ApplyTo(text string) string {
+	return text[:t.Pos()] + t.NewText + text[t.End():]
+}
+
+func ApplyBulkEdits(text string, edits []TextChange) string {
+	b := strings.Builder{}
+	b.Grow(len(text))
+	lastEnd := 0
+	for _, e := range edits {
+		start := e.TextRange.Pos()
+		if start != lastEnd {
+			b.WriteString(text[lastEnd:e.TextRange.Pos()])
+		}
+		b.WriteString(e.NewText)
+
+		lastEnd = e.TextRange.End()
+	}
+	b.WriteString(text[lastEnd:])
+
+	return b.String()
+}