parser: Final (!) fix for issue with escaped JSON front matter

Fixes #3682

Author: bep

parser/page.go

@@ -337,7 +337,6 @@ func extractFrontMatterDelims(r *bufio.Reader, left, right []byte) (fm []byte, e
 			if escapeState != 1 {
 				inQuote = !inQuote
 			}
-			escapeState = 0
 		case '\\':
 			escapeState++
 		case left[len(left)-1]:
@@ -403,6 +402,10 @@ func extractFrontMatterDelims(r *bufio.Reader, left, right []byte) (fm []byte, e
 			return buf.Bytes(), nil
 		}
 
+		if c != '\\' {
+			escapeState = 0
+		}
+
 	}
 }
 

parser/parse_frontmatter_test.go

@@ -305,6 +305,8 @@ func TestExtractFrontMatterDelim(t *testing.T) {
 		{`{ "title": "\"Foo\"" }`, `{ "title": "\"Foo\"" }`, noErrExpected},
 		{`{ "title": "\"Foo\"\"" }`, `{ "title": "\"Foo\"\"" }`, noErrExpected},
 		{`{ "url": "http:\/\/example.com\/play\/url?id=1" }`, `{ "url": "http:\/\/example.com\/play\/url?id=1" }`, noErrExpected},
+		{`{ "test": "\"New\r\nString\"" }`, `{ "test": "\"New\r\nString\"" }`, noErrExpected},
+		{`{ "test": "RTS\/RPG" }`, `{ "test": "RTS\/RPG" }`, noErrExpected},
 	}
 
 	for i, test := range tests {