fix: added new ast type and moved parsing functions to a different header

src/utils/ast/ast.h

@@ -8,13 +8,14 @@
 enum ast_type
 {
     AST_END,
+    AST_LIST,
     AST_IF,
     AST_CMD
 };
 
 struct ast_cmd
 {
-    struct list *cmd;
+    struct list *cmd; // A list of words (char*)
 };
 
 struct ast_if
@@ -37,6 +38,11 @@ struct ast
     void *data;
 };
 
+struct ast_list
+{
+    struct list *children; // A list of ASTs (ast*)
+};
+
 /**
  * Checks if the given AST node is an if statement.
  */
@@ -47,6 +53,11 @@ bool ast_is_if(struct ast *node);
  */
 bool ast_is_cmd(struct ast *node);
 
+/**
+ * Checks if the given AST node is a command.
+ */
+bool ast_is_list(struct ast *node);
+
 /**
  * Retrieves the if statement data from the given AST node.
  * Assumes that the node is of type AST_IF.
@@ -59,6 +70,12 @@ struct ast_if *ast_get_if(struct ast *node);
  */
 struct ast_cmd *ast_get_cmd(struct ast *node);
 
+/**
+ * Retrieves the command data from the given AST node.
+ * Assumes that the node is of type AST_LIST.
+ */
+struct ast_list *ast_get_list(struct ast *node);
+
 /**
  * Creates a new AST node representing an if statement.
  */
@@ -70,4 +87,9 @@ struct ast *ast_create_if(struct ast *condition, struct ast *then_clause,
  */
 struct ast *ast_create_cmd(struct list *cmd);
 
+/**
+ * Creates a new AST node representing a list of ASTs
+ */
+struct ast* ast_create_list(struct list* ast_list);
+
 #endif /* ! AST_H */