parser: Unescaped [WIP]

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

parser/error.go

@@ -48,3 +48,15 @@ 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()
+
+	s = s[:len(s)-len(seq)]
+	pos.Add(GetPositionalLength(s))
+
+	return NewError(pos, seq, "invalid escape character", fs.ErrInvalid)
+}