go/token: add (*File).Lines method
This method returns the array updated by SetLines, for
use in exporter packages.
Fixes #57708
Change-Id: I12ed5e7e1bae7517f40cb25e76e51997c25d84f4
Reviewed-on: https://go-review.googlesource.com/c/go/+/464515
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Run-TryBot: Alan Donovan <adonovan@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Alan Donovan <adonovan@google.com>
diff --git a/api/next/57708.txt b/api/next/57708.txt
new file mode 100644
index 0000000..c7389ad
--- /dev/null
+++ b/api/next/57708.txt
@@ -0,0 +1 @@
+pkg go/token, method (*File) Lines() []int #57708
diff --git a/src/go/token/position.go b/src/go/token/position.go
index cbc2ddb..4d129d9 100644
--- a/src/go/token/position.go
+++ b/src/go/token/position.go
@@ -159,6 +159,15 @@
f.lines = f.lines[:len(f.lines)-1]
}
+// Lines returns the effective line offset table of the form described by SetLines.
+// Callers must not mutate the result.
+func (f *File) Lines() []int {
+ f.mutex.Lock()
+ lines := f.lines
+ f.mutex.Unlock()
+ return lines
+}
+
// SetLines sets the line offsets for a file and reports whether it succeeded.
// The line offsets are the offsets of the first character of each line;
// for instance for the content "ab\nc\n" the line offsets are {0, 3}.
diff --git a/src/go/token/position_test.go b/src/go/token/position_test.go
index 65cb242..19774a9 100644
--- a/src/go/token/position_test.go
+++ b/src/go/token/position_test.go
@@ -130,6 +130,9 @@
if f.LineCount() != len(test.lines) {
t.Errorf("%s, SetLines: got line count %d; want %d", f.Name(), f.LineCount(), len(test.lines))
}
+ if !reflect.DeepEqual(f.Lines(), test.lines) {
+ t.Errorf("%s, Lines after SetLines(v): got %v; want %v", f.Name(), f.Lines(), test.lines)
+ }
verifyPositions(t, fset, f, test.lines)
// add lines with SetLinesForContent and verify all positions
