added

vendor/github.com/shurcooL/go/reflectsource/indicies.go

@@ -0,0 +1,29 @@
+package reflectsource
+
+import (
+	"bytes"
+)
+
+// getLineStartEndIndicies gets the starting and ending caret indicies of line with specified lineIndex.
+// Does not include newline character.
+// First line has index 0.
+// Returns (-1, -1) if line is not found.
+func getLineStartEndIndicies(b []byte, lineIndex int) (startIndex, endIndex int) {
+	index := 0
+	for line := 0; ; line++ {
+		lineLength := bytes.IndexByte(b[index:], '\n')
+		if line == lineIndex {
+			if lineLength == -1 {
+				return index, len(b)
+			} else {
+				return index, index + lineLength
+			}
+		}
+		if lineLength == -1 {
+			break
+		}
+		index += lineLength + 1
+	}
+
+	return -1, -1
+}