From e11d94fcd7fc1d3c206b5dc42d2d0ce0deeda34d Mon Sep 17 00:00:00 2001
From: Gustavo Niemeyer <gustavo@niemeyer.net>
Date: Sun, 29 May 2011 00:23:32 -0300
Subject: [PATCH] template: fix quote-handling with formatters

Fixes issue #1896.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4539093
---
 src/pkg/template/template.go      | 9 +++++----
 src/pkg/template/template_test.go | 4 ++++
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/pkg/template/template.go b/src/pkg/template/template.go
index c00f72ac94..1eb0295a55 100644
--- a/src/pkg/template/template.go
+++ b/src/pkg/template/template.go
@@ -395,10 +395,11 @@ func words(buf []byte) []string {
 			} else {
 				i++
 			}
-		} else {
-			for i < len(buf) && !white(buf[i]) {
-				i++
-			}
+		}
+		// Even with quotes, break on whitespace only.  This will
+		// work with e.g. {""|} and catch quoting mistakes properly.
+		for i < len(buf) && !white(buf[i]) {
+			i++
 		}
 		s = append(s, string(buf[start:i]))
 	}
diff --git a/src/pkg/template/template_test.go b/src/pkg/template/template_test.go
index a5e6a4ecc8..147a1ca217 100644
--- a/src/pkg/template/template_test.go
+++ b/src/pkg/template/template_test.go
@@ -762,6 +762,10 @@ var formatterTests = []Test{
 		in:  `{"%.02f 0x%02X" 1.1 10|printf}`,
 		out: "1.10 0x0A",
 	},
+	{
+		in:  `{""|}{""||}{""|printf}`, // Issue #1896.
+		out: "",
+	},
 }
 
 func TestFormatters(t *testing.T) {
-- 
2.48.1