- changed parser to return os.Error, removed ErrorHandler

- added IsValid predicate to token.Position
- updated pretty, godoc, gobuild
- updated/expanded test cases

R=rsc
DELTA=265  (97 added, 78 deleted, 90 changed)
OCL=28961
CL=29005

1 files changed, 8 insertions, 0 deletions

diff --git a/src/lib/go/token/token.go b/src/lib/go/token/token.go
index b71d0f03d..a70a75a54 100644
--- a/src/lib/go/token/token.go
+++ b/src/lib/go/token/token.go
@@ -324,6 +324,8 @@ func (tok Token) IsKeyword() bool {
 
 
 // Token source positions are represented by a Position value.
+// A Position is valid if the line number is > 0.
+//
 type Position struct {
 	Offset int;  // byte offset, starting at 0
 	Line int;  // line number, starting at 1
@@ -337,3 +339,9 @@ type Position struct {
 func (pos *Position) Pos() Position {
 	return *pos;
 }
+
+
+// IsValid returns true if the position is valid.
+func (pos *Position) IsValid() bool {
+	return pos.Line > 0
+}