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#include "forthmachine.h"
#include <stdio.h>
#include <string.h>
#include "drhstrings.h"
#include "errorhandler.h"
#include "stack.h"
/****/
forthmachine* forthmachine_new(errorhandler errorhandler) {
forthmachine* fm = (forthmachine*)malloc(sizeof(forthmachine));
fm->ot = optable_new(errorhandler);
fm->s = stack_new(errorhandler);
fm->outputbuffer = (char*)malloc(sizeof(char) * MAX_OUTPUT_BUFFER_SIZE);
strcpy(fm->outputbuffer, "");
fm->errorhandler = errorhandler;
fm->lcs = stack_new(errorhandler);
return fm;
}
static void op_exec(wordop* op, forthmachine* fm) {
switch (op->optype) {
case optype_builtin:
op->op(fm);
break;
case optype_compiled:
for (int j = 0; j < op->oplistlen; j++) {
switch (op->oplist[j].type) {
case compileditem_literal:
stack_push(fm->s, op->oplist[j].literal);
break;
case compileditem_stackop:
op_exec(op->oplist[j].wordop, fm);
break;
case compileditem_ifcontrol:
{
stackitem si = stack_pop(fm->s);
int jumpto = op->oplist[j].jumpto;
if (!si && jumpto != -1) {
j = jumpto - 1;
}
break;
}
case compileditem_doloopcontrol:
{
int index = stack_pop(fm->lcs);
int limit = stack_pop(fm->lcs);
index++;
if (index < limit) {
j = op->oplist[j].loopbackto - 1;
stack_push(fm->lcs, limit);
stack_push(fm->lcs, index);
}
break;
}
}
}
break;
}
}
static void forthmachine_exec(forthmachine* fm, char *word, int len, char* line, int* i) {
if (0 == strcmp(word, ":")) {
optable_defineop(fm->ot, line, i);
return;
}
wordop* op = optable_getop(fm->ot, word);
if (op) {
op_exec(op, fm);
} else if (isnumber(word)) {
stack_push(fm->s, atoi(word));
}
}
void forthmachine_eval(forthmachine* fm, int len, char* line) {
char word[WORD_LEN_LIMIT];
int wordi = 0;
for (int i = 0; i < len; i++) {
if (notdelim(line[i]) && wordi < WORD_LEN_LIMIT - 1) {
word[wordi++] = line[i];
} else { // end of word
if (wordi > 0) { // don't exec an empty string
word[wordi] = '\0';
forthmachine_exec(fm, word, len, line, &i);
}
// start new word
wordi = 0;
}
// end of input string
if (line[i] == '\0') {
return;
}
}
}
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