feat: ast_subshell

src/utils/Makefile.am

@@ -21,6 +21,7 @@ libutils_a_SOURCES =  \
 	args/args.c \
 	vars/vars.c \
 	ast/ast_assignment.c \
+	ast/ast_subshell.c \
 	ast/ast_function.c
 
 libutils_a_CPPFLAGS = -I$(top_srcdir)/src

src/utils/ast/ast.h

@@ -15,5 +15,6 @@
 #include "ast_redir.h"
 #include "ast_void.h"
 #include "ast_word.h"
+#include "ast_subshell.h"
 
 #endif /* ! AST_H */

src/utils/ast/ast_base.h

@@ -18,7 +18,8 @@ enum ast_type
     AST_NEG,
     AST_LOOP,
     AST_ASSIGNMENT,
-    AST_FUNCTION
+    AST_FUNCTION,
+    AST_SUBSHELL
 };
 
 struct ast

src/utils/ast/ast_subshell.c

@@ -0,0 +1,31 @@
+#include "ast_subshell.h"
+
+bool ast_is_subshell(struct ast *node)
+{
+    return node != NULL && node->type == AST_SUBSHELL;
+}
+
+struct ast_subshell *ast_get_subshell(struct ast *node)
+{
+    if (ast_is_subshell(node))
+        return (struct ast_subshell *)node->data;
+    return NULL;
+}
+
+struct ast *ast_create_subshell(struct ast *child)
+{
+    struct ast_subshell *subshell = calloc(1, sizeof(struct ast_subshell));
+    if (subshell == NULL)
+        return NULL;
+    subshell->child = child;
+
+    return ast_create(AST_SUBSHELL, subshell);
+}
+
+void ast_free_subshell(struct ast_subshell *subshell)
+{
+    if (!subshell)
+        return;
+    ast_free(&subshell->child);
+    free(subshell);
+}

src/utils/ast/ast_subshell.h

@@ -0,0 +1,19 @@
+#ifndef AST_SUBSHELL_H
+#define AST_SUBSHELL_H
+
+#include "ast_base.h"
+
+struct ast_subshell
+{
+    struct ast *child;
+};
+
+bool ast_is_subshell(struct ast *node);
+
+struct ast_subshell *ast_get_subshell(struct ast *node);
+
+struct ast *ast_create_subshell(struct ast *child);
+
+void ast_free_subshell(struct ast_subshell *subshell);
+
+#endif /* ! AST_SUBSHELL_H */