#ifndef _ast_h
#define _ast_h

#include <stdlib.h>
#include <stddef.h>

typedef enum {
	AST_LIST,
	AST_NUM,
	AST_SYMBOL,
} AstTy;
#define AST_TY_LAST AST_SYMBOL+1

struct _astnode;
typedef struct _astnode AstNode;

typedef struct {
	size_t len;
	size_t cap;
	AstNode *vals;
} AstVec;

struct _astnode {
	AstTy ty;
	union {
		int num;
		AstVec list;
		char *str;
	} as;
};


AstVec astvec_new();
void astvec_append(AstVec *v, AstNode val);
void astnode_append(AstNode *l, AstNode val);

AstNode astnode_new_num(int n);
AstNode astnode_new_list();
AstNode astnode_new_symbol(char *s);

void astnode_disp(AstNode *a);

const char *ast_ty_to_str(AstTy ty);



#endif