go/scanner: support for complex (imaginary) constants

R=rsc
CC=golang-dev
http://codereview.appspot.com/223044

1 files changed, 6 insertions, 1 deletions

diff --git a/src/pkg/go/scanner/scanner.go b/src/pkg/go/scanner/scanner.go
index b2e120179..a59212011 100644
--- a/src/pkg/go/scanner/scanner.go
+++ b/src/pkg/go/scanner/scanner.go
@@ -302,7 +302,7 @@ func (S *Scanner) scanNumber(pos token.Position, seenDecimalPoint bool) token.To
 				seenDecimalDigit = true
 				S.scanMantissa(10)
 			}
-			if S.ch == '.' || S.ch == 'e' || S.ch == 'E' {
+			if S.ch == '.' || S.ch == 'e' || S.ch == 'E' || S.ch == 'i' {
 				goto fraction
 			}
 			// octal int
@@ -333,6 +333,11 @@ exponent:
 		S.scanMantissa(10)
 	}
 
+	if S.ch == 'i' {
+		tok = token.IMAG
+		S.next()
+	}
+
 exit:
 	return tok
 }