parser: Unescaped [WIP]

Signed-off-by: Alejandro Mery <amery@jpi.io>

parser/error.go

@@ -49,6 +49,9 @@ func newErrIncomplete(p *TextParser, hint string) *lexer.Error {
 	return NewError(pos, s, hint, fs.ErrInvalid)
 }
 
+// NewErrInvalidEscapeSequence returns a [lexer.Error] indicating
+// the specified sequence, at the end of the accepted buffer,
+// is invalid
 func NewErrInvalidEscapeSequence(p *TextParser, seq string) *lexer.Error {
 	pos, s := p.Position(), p.String()
 

parser/text_quoted.go

@@ -76,7 +76,7 @@ func lexQuotedStringEscaped(p *TextParser) (string, *lexer.Error) {
 	var result strings.Builder
 
 	// append what was accepted before the escape character
-	result.WriteString(p.String()[1:])
+	_, _ = result.WriteString(p.String()[1:])
 
 	for {
 		r, _, err := p.ReadRune()
@@ -101,14 +101,13 @@ func lexQuotedStringEscaped(p *TextParser) (string, *lexer.Error) {
 			default:
 				// TODO: check valid escape character and
 				// append to result
-				p.UnreadRune()
 				s := string([]rune{r, r2})
 				err := NewErrInvalidEscapeSequence(p, s)
 				return "", err
 			}
 		default:
 			// normal, append to result
-			result.WriteRune(r)
+			_, _ = result.WriteRune(r)
 		}
 	}
 }