lsp/rangeset: add String methods

Useful for debugging.

Signed-off-by: Matthew Sackman <[e-mail]>
Change-Id: I79a687d961676f5ca05b3025c498d002ea9fe8f8
Reviewed-on: https://cue.gerrithub.io/c/cue-lang/cue/+/1224689
Unity-Result: CUE porcuepine <[e-mail]>
TryBot-Result: CUEcueckoo <[e-mail]>
Reviewed-by: Roger Peppe <[e-mail]>

internal/lsp/rangeset/file_rangeset.go

···
 
 import (
 	"cmp"
+	"fmt"
 	"slices"
 )
 
 type FilenameRangeSet struct {
 	pairs []filenameRangeSetPair
+}
+
+func (frs *FilenameRangeSet) String() string {
+	return fmt.Sprint(frs.pairs)
 }
 
 func NewFilenameRangeSet() *FilenameRangeSet {
···
 type filenameRangeSetPair struct {
 	filename string
 	ranges   *RangeSet
+}
+
+func (frs filenameRangeSetPair) String() string {
+	return fmt.Sprintf("{%s: %v}", frs.filename, frs.ranges)
 }
 
 func (frs *FilenameRangeSet) Add(filename string, start, end int) {

internal/lsp/rangeset/rangeset.go

···
 	End   int
 }
 
+func (r Range) String() string {
+	return fmt.Sprintf("%d-%d", r.Start, r.End)
+}
+
 // RangeSet holds a collection of sorted, non-overlapping ranges.
 type RangeSet struct {
 	ranges []Range