Add support for multi-line double-quoted strings with CRLF line endings (#744)

Author: shuheiktgw

decode_test.go

@@ -468,6 +468,18 @@ func TestDecoder(t *testing.T) {
 			source: "'1': \"2\\r\\n3\"",
 			value:  map[interface{}]interface{}{"1": "2\r\n3"},
 		},
+		{
+			source: "'1': \"a\\\nb\\\nc\"",
+			value:  map[interface{}]interface{}{"1": "abc"},
+		},
+		{
+			source: "'1': \"a\\\r\nb\\\r\nc\"",
+			value:  map[interface{}]interface{}{"1": "abc"},
+		},
+		{
+			source: "'1': \"a\\\rb\\\rc\"",
+			value:  map[interface{}]interface{}{"1": "abc"},
+		},
 
 		{
 			source: "a: -b_c",

scanner/scanner.go

@@ -522,6 +522,17 @@ func (s *Scanner) scanDoubleQuote(ctx *Context) (*token.Token, error) {
 				s.progressLine(ctx)
 				idx++
 				continue
+			case '\r':
+				isFirstLineChar = true
+				isNewLine = true
+				ctx.addOriginBuf(nextChar)
+				s.progressLine(ctx)
+				progress = 1
+				// Skip \n after \r in CRLF sequences
+				if idx+2 < size && src[idx+2] == '\n' {
+					ctx.addOriginBuf('\n')
+					progress = 2
+				}
 			case '\t':
 				progress = 1
 				ctx.addOriginBuf(nextChar)