#include "expr.h"

#include "am.h"

#include <string.h>

expr_t *expr_integer(am_t *am, int64_t value)
{
	expr_t *expr = store_alloc(am);
	expr->is_atom = true;
	expr->atom.type = ATOM_TYPE_INTEGER;
	expr->atom.integer = value;
	return expr;
}

expr_t *expr_symbol(am_t *am, const symbol_t *symbol)
{
	expr_t *expr = store_alloc(am);
	expr->is_atom = true;
	expr->atom.type = ATOM_TYPE_SYMBOL;
	memcpy(&expr->atom.symbol, symbol, sizeof(symbol_t));
	return expr;
}

expr_t *expr_str_symbol(am_t *am, const char *str)
{
	symbol_t symbol = { .len = strlen(str) };
	memcpy(symbol.buf, str, symbol.len);
	return expr_symbol(am, &symbol);
}

expr_t *expr_empty_list(am_t *am)
{
	expr_t *expr = store_alloc(am);
	expr->is_atom = true;
	expr->atom.type = ATOM_TYPE_EMPTY_LIST;
	return expr;
}

expr_t *expr_pair(am_t *am, expr_t *car, expr_t *cdr)
{
	expr_t *expr = store_alloc(am);
	expr->is_atom = false;
	expr->pair.car = car;
	expr->pair.cdr = cdr;
	return expr;
}

expr_t *expr_prim_proc(am_t *am, prim_proc_t prim_proc)
{
	expr_t *expr = store_alloc(am);
	expr->is_atom = true;
	expr->atom.type = ATOM_TYPE_PRIM_PROC;
	expr->atom.prim_proc = prim_proc;
	return expr;
}