55 lines
806 B
C
55 lines
806 B
C
#include "eval.h"
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#include "env.h"
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#include <assert.h>
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static void eval_atom(am_t *am)
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{
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switch (AM_EXPR(am)->atom.type) {
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case ATOM_TYPE_EMPTY_LIST:
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case ATOM_TYPE_INTEGER:
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case ATOM_TYPE_PRIM_PROC:
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am_assign(am, VAL, EXPR);
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break;
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case ATOM_TYPE_SYMBOL:
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env_fetch(am);
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break;
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}
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}
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static void eval_list(am_t *am)
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{
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AM_ARGL(am) = expr_empty_list(am);
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am_cdr(am, UNEV, EXPR);
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am_car(am, EXPR, EXPR);
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while (!AM_UNEV(am)->is_atom) {
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am_push(am, EXPR);
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am_push(am, ARGL);
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am_car(am, EXPR, UNEV);
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am_cdr(am, UNEV, UNEV);
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am_push(am, UNEV);
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eval(am);
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am_pop(am, UNEV);
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am_pop(am, ARGL);
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am_pop(am, EXPR);
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am_append(am, ARGL, VAL);
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}
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env_fetch(am);
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am_call(am, VAL);
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}
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void eval(am_t *am)
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{
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if (AM_EXPR(am)->is_atom)
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eval_atom(am);
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else
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eval_list(am);
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}
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