support CR

decode_test.go

@@ -534,6 +534,14 @@ func TestDecoder(t *testing.T) {
 			"hello: world\n",
 			map[string]string{"hello": "world"},
 		},
+		{
+			"hello: world\r\n",
+			map[string]string{"hello": "world"},
+		},
+		{
+			"hello: world\rGo: Gopher",
+			map[string]string{"hello": "world", "Go": "Gopher"},
+		},
 
 		// Structs and type conversions.
 		{

scanner/scanner.go

@@ -491,7 +491,16 @@ func (s *Scanner) scan(ctx *Context) (pos int) {
 				pos += progress
 				return
 			}
-		case '\n':
+		case '\r', '\n':
+			// There is no problem that we ignore CR which followed by LF and normalize it to LF, because of following YAML1.2 spec.
+			// > Line breaks inside scalar content must be normalized by the YAML processor. Each such line break must be parsed into a single line feed character.
+			// > Outside scalar content, YAML allows any line break to be used to terminate lines.
+			// > -- https://yaml.org/spec/1.2/spec.html
+			if c == '\r' && ctx.nextChar() == '\n' {
+				ctx.addOriginBuf('\r')
+				ctx.progress(1)
+				c = '\n'
+			}
 			s.scanNewLine(ctx, c)
 			continue
 		case ' ':