120 lines
2.2 KiB
C++
120 lines
2.2 KiB
C++
#include "dict.h"
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#include "io.h"
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#include "parser.h"
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#include "system.h"
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#include <stdlib.h>
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#include <string.h>
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#ifdef __linux__
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#include "linux.h"
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#endif // __linux__
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static char ok[] = "ok.\n";
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static System sys;
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static void
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write_dstack()
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{
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KF_INT tmp;
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sys.interface->wrch('<');
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for (size_t i = 0; i < sys.dstack.size(); i++) {
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if (i > 0) {
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sys.interface->wrch(' ');
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}
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sys.dstack.get(i, tmp);
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write_num(sys.interface, tmp);
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}
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sys.interface->wrch('>');
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}
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static bool
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parser(const char *buf, const size_t buflen)
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{
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static size_t offset = 0;
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static struct Token token;
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static PARSE_RESULT result = PARSE_FAIL;
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static LOOKUP lresult = LOOKUP_FAILED;
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static bool stop = false;
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offset = 0;
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// reset token
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token.token = nullptr;
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token.length = 0;
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while ((result = parse_next(buf, buflen, &offset, &token)) == PARSE_OK) {
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lresult = lookup(&token, &sys);
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switch (lresult) {
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case LOOKUP_OK:
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continue;
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case LOOKUP_NOTFOUND:
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sys.interface->wrln((char *)"word not found", 15);
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stop = true;
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break;
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case LOOKUP_FAILED:
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sys.interface->wrln((char *)"execution failed", 17);
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stop = true;
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break;
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default:
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sys.interface->wrln((char *)"*** the world is broken ***", 27);
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exit(1);
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}
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if (stop) {
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stop = false;
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break;
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}
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}
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switch (result) {
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case PARSE_OK:
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return false;
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case PARSE_EOB:
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sys.interface->wrbuf(ok, 4);
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return true;
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case PARSE_LEN:
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sys.interface->wrln((char *)"parse error: token too long", 27);
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return false;
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case PARSE_FAIL:
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sys.interface->wrln((char *)"parser failure", 14);
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return false;
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default:
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sys.interface->wrln((char *)"*** the world is broken ***", 27);
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exit(1);
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}
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}
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static void
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interpreter()
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{
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static size_t buflen = 0;
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static char linebuf[81];
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while (true) {
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write_dstack();
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sys.interface->wrch('\n');
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sys.interface->wrch('?');
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sys.interface->wrch(' ');
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buflen = sys.interface->rdbuf(linebuf, 80, true, '\n');
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parser(linebuf, buflen);
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}
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}
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static char banner[] = "kforth interpreter\n";
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const size_t bannerlen = 19;
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int
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main(void)
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{
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init_dict(&sys);
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#ifdef __linux__
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Console interface;
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sys.interface = &interface;
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#endif
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sys.interface->wrbuf(banner, bannerlen);
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interpreter();
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return 0;
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} |