97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
#include <assert.h>
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#include <stddef.h>
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#include "uclisp.h"
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#include "internal.h"
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#include "utility.h"
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#include "state.h"
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// TODO: remove string.h
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#include <string.h>
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struct ucl_object *ucl_evaluate_builtin_form(struct ucl_state *state, struct ucl_object *list) {
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// TODO: Reasonably split builtin and non-builtin evaluation
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struct ucl_object *evaluated_list = ucl_nil_create();
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FOREACH_LIST(list, iter, item) {
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struct ucl_object *obj = ucl_evaluate(state, item);
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UCL_RET_IF_ERROR(obj);
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ucl_list_append(evaluated_list, obj);
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};
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struct ucl_object *fun = ucl_car(evaluated_list);
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struct ucl_object *result = NULL;
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if (fun->type == UCL_TYPE_BUILTIN) {
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struct ucl_object *args = ucl_cdr(evaluated_list);
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result = fun->builtin(state, args);
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} else if (fun->type == UCL_TYPE_CELL) {
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struct ucl_state *fun_state = ucl_state_create_child(state);
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struct ucl_object *fun_arg_syms = ucl_car(fun);
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struct ucl_object *fun_forms = ucl_cdr(fun);
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int i = 0;
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FOREACH_LIST(fun_arg_syms, iter, sym) {
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ucl_state_put(fun_state, sym->symbol, ucl_list_nth(evaluated_list, i + 1));
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i++;
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}
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result = ucl_progn(fun_state, fun_forms);
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} else {
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assert(0);
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}
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// TODO: cleanup
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return (result == NULL) ? ucl_nil_create() : result;
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}
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struct ucl_object *ucl_evaluate_special_form(struct ucl_state *state, struct ucl_object *list) {
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// TODO: Recursively eval args
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const char *fun_sym = ucl_car(list)->symbol;
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struct ucl_object *fun = ucl_state_get(state, fun_sym);
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struct ucl_object *args = ucl_cdr(list);
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struct ucl_object *result = NULL;
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result = fun->special(state, args);
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return result;
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}
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struct ucl_object *ucl_evaluate_list(struct ucl_state *state, struct ucl_object *list) {
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if (list->cell.car == NULL) {
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return list;
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}
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struct ucl_object *fun = ucl_evaluate(state, ucl_car(list));
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UCL_RET_IF_ERROR(fun);
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if (fun->type == UCL_TYPE_SPECIAL) {
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return ucl_evaluate_special_form(state, list);
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} else if (fun->type == UCL_TYPE_BUILTIN || fun->type == UCL_TYPE_CELL) {
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return ucl_evaluate_builtin_form(state, list);
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} else {
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assert(0);
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// TODO: Lisp functions and other errors
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}
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}
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struct ucl_object *ucl_evaluate(struct ucl_state *state, struct ucl_object *obj) {
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assert(obj != NULL);
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switch (obj->type) {
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case UCL_TYPE_CELL:
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return ucl_evaluate_list(state, obj);
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case UCL_TYPE_SYMBOL:
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return ucl_state_get(state, obj->symbol);
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case UCL_TYPE_INT:
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case UCL_TYPE_STRING:
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case UCL_TYPE_ERROR:
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return obj;
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case UCL_TYPE_BUILTIN:
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case UCL_TYPE_SPECIAL:
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case UCL_TYPE_COUNT:
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assert(0);
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return NULL;
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}
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}
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