/* @brief Parses a simple list of words (command and arguments)
 * and returns the resulting ast
 */
struct ast *parse_simple_command(void);

/* 
 */
struct ast *parse_if_rule(void);

/*
 */
struct ast *parse_shell_command(void);

/* @brief parses commands inside if/else clauses and returns the corresponding
 * AST list
 */
struct ast* parse_compound_list(void);

/*
 */
struct ast* parse_and_or(void);

/*
 */
struct ast* parse_else_clause(void);