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#include "forthmachine.h"
#include <string.h>
#include "drhstrings.h"
/****/
forthmachine* forthmachine_new() {
forthmachine* fm = (forthmachine*)malloc(sizeof(forthmachine));
fm->ot = optable_new();
fm->s = stack_new();
fm->outputbuffer = (char*)malloc(sizeof(char) * MAX_OUTPUT_BUFFER_SIZE);
strcpy(fm->outputbuffer, "");
return fm;
}
static void op_exec(wordop* op, forthmachine* fm, char *word, int len, char* line, int* i) {
switch (op->optype) {
case script:
forthmachine_eval(fm, op->scriptlen, op->script);
break;
case builtin:
op->op(fm);
break;
case directive:
op->directive(fm, len, line, i);
break;
case compiled:
for (int j = 0; j < op->oplistlen; j++) {
if (op->oplist[j].isliteral) {
stack_push(fm->s, op->oplist[j].literal);
} else {
op_exec(op->oplist[j].wordop, fm, word, len, line, i);
}
}
break;
}
}
static void forthmachine_exec(forthmachine* fm, char *word, int len, char* line, int* i) {
wordop* op = optable_getop(fm->ot, word);
if (op) {
op_exec(op, fm, word, len, line, i);
} 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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