feat: Merge branch 'ast-def' into dev

src/utils/ast/Makefile.am

@@ -0,0 +1,9 @@
+lib_LIBRARIES = libast.a
+
+libast_a_SOURCES =  \
+  ast.c \
+  ast.h
+
+libast_a_CPPFLAGS = -I$(top_srcdir)/src
+
+noinst_LIBRARIES = libast.a

src/utils/ast/ast.h

@@ -0,0 +1,37 @@
+#ifndef AST_H
+#define AST_H
+
+#include "lists.h"
+
+enum ast_type
+{
+    AST_END = 0,
+    AST_IF,
+    AST_CMD
+};
+
+union ast_node
+{
+    struct ast_if;
+    struct ast_cmd;
+};
+
+struct ast
+{
+    enum ast_type type;
+    union ast_node data;
+};
+
+struct ast_if
+{
+    struct ast* condition;  
+    struct ast* then_clause;
+    struct ast* else_clause;
+};
+
+struct ast_cmd
+{
+    struct list* cmd;
+};
+
+#endif /* ! AST_H */