1 files changed, 52 insertions, 0 deletions
diff --git a/21sh/ll-expr/src/eval/rpn_print.c b/21sh/ll-expr/src/eval/rpn_print.c
new file mode 100644
index 0000000..defb519
--- /dev/null
+++ b/21sh/ll-expr/src/eval/rpn_print.c
@@ -0,0 +1,52 @@
+#include <stdio.h>
+
+#include "lexer.h"
+#include "parser.h"
+
+char tab[] = { [AST_PLUS] = '+',
+               [AST_MINUS] = '-',
+               [AST_MUL] = '*',
+               [AST_DIV] = '/' };
+
+void print_ast(struct ast *ast)
+{
+    if (!ast)
+        return;
+
+    if (ast->type == AST_NUMBER)
+        printf("%zu ", ast->value);
+    else if (ast->type == AST_NEG)
+        printf("-%zu ", (ast->left)->value);
+    else
+    {
+        print_ast(ast->left);
+        print_ast(ast->right);
+
+        printf("%c ", tab[ast->type]);
+    }
+}
+
+int main(int argc, char *argv[])
+{
+    if (argc != 2)
+        return 1;
+
+    struct lexer *lexer = lexer_new(argv[1]);
+
+    struct ast *ast;
+    enum parser_status status;
+    ast = parse(&status, lexer);
+    if (status != PARSER_OK)
+    {
+        lexer_free(lexer);
+        return 1;
+    }
+
+    print_ast(ast);
+    printf("\n");
+
+    ast_free(ast);
+    lexer_free(lexer);
+
+    return 0;
+}