feat: redirection rules

src/parser/grammar_advanced.h

@@ -1,4 +1,27 @@
 #ifndef GRAMMAR_ADVANCED_H
 #define GRAMMAR_ADVANCED_H
 
+#include "grammar.h"
+
+// === Functions
+
+/*
+ * @brief parses a redirection rule
+ *
+ * @code redirection = [IONUMBER] ( '>' | '<' | '>>' | '>&' | '<&' | '>|' | '<>' ) WORD ;
+ *
+ * @first TOKEN_IONUMBER, TOKEN_REDIRECTION
+ */
+struct ast *parse_redirection(struct lexer_context *ctx);
+
+/*
+ * @brief parses a prefix rule
+ *
+ * @code prefix = redirection ;
+ *
+ * @first first(redirection)
+ */
+struct ast *parse_prefix(struct lexer_context *ctx);
+
+
 #endif /* ! GRAMMAR_ADVANCED_H */