parser: introduce ErrPlusPosition to apply a position offset to a lexer.Error

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

parser/error.go

@@ -14,3 +14,14 @@ func NewError(pos lexer.Position, content, hint string, err error) *lexer.Error
 		Err:     err,
 	}
 }
+
+// ErrPlusPosition returns a copy of the given [lexer.Error]
+// offsetting the Line/Column information.
+func ErrPlusPosition(pos lexer.Position, e *lexer.Error) *lexer.Error {
+	pos.Add(lexer.Position{
+		Line:   e.Line,
+		Column: e.Column,
+	})
+
+	return NewError(pos, e.Content, e.Hint, e.Err)
+}