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vtl.c
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389 lines (327 loc) · 7.76 KB
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/*
Very Tiny Language
T. Nakagawa
2004/05/23
2004/06/26
*/
#define MEMSIZE (1024 * 32)
#define READB(adrs) (*(Lct + (adrs) % MEMSIZE))
#define WRITEB(adrs, data) ((*(Lct + (adrs) % MEMSIZE) = (data)))
#define READW(adrs) ((unsigned short)(*(Lct + (adrs) % MEMSIZE) + *(Lct + ((adrs) + 1) % MEMSIZE) * 256))
#define WRITEW(adrs, data) (*(Lct + (adrs) % MEMSIZE) = (data) % 256, *(Lct + ((adrs) + 1) % MEMSIZE) = (data) / 256)
#define Nbf 0x82
#define Lbf 0x88
#define Svp ((2 + '!') * 2)
#define Pcc ((2 + '#') * 2)
#define Rmd ((2 + '%') * 2)
#define Bnd ((2 + '&') * 2)
#define Rnd ((2 + '\'') * 2)
#define Lmt ((2 + '*') * 2)
#define Obj 0x108
unsigned char Lct[MEMSIZE];
void initl(void) {
WRITEW(Lmt, MEMSIZE); /* RAM End */
WRITEW(Bnd, Obj); /* Program End */
return;
}
unsigned char getchr(void) {
int c;
c = getch();
if (c == '\x03') exit(0); /* CTRL+C */
if (c < 0) c = 0;
putch(c);
return (unsigned char)c;
}
void putchr(unsigned char c) {
putch(c);
return;
}
static int fndln(unsigned short *ptr);
static unsigned short nxtln(unsigned short ptr);
static void getln(unsigned short lbf);
static int getnm(unsigned short *ptr, unsigned short *n);
static int num(unsigned short ptr);
static void ordr(unsigned short ptr);
static void expr(unsigned short *ptr, unsigned short *val);
static void factr(unsigned short *ptr, unsigned short *val);
static void term(unsigned short *ptr, unsigned short *val);
static void getvr(unsigned short *ptr, unsigned char *c, unsigned short *adr);
static void putl(unsigned short *ptr, unsigned char d);
static void crlf(void);
static void putnm(unsigned short x);
static void putstr(char *str);
int main(void) {
unsigned short ptr;
unsigned short n;
initl();
putstr("VTL-C\r\n");
for (; ; ) {
ptr = Lbf + 2;
getln(ptr);
if (!getnm(&ptr, &n)) {
unsigned short line;
line = Lbf;
WRITEW(line, 0);
WRITEW(Pcc, 0);
for (; ; ) {
ordr(ptr);
if (READW(Pcc) == 0 || READW(Pcc) == READW(line)) {
/* no branch */
if (line == Lbf) break; /* ダイレクトモードの場合 */
line = nxtln(line);
if (line == READW(Bnd)) break; /* 最終行まで実行した場合 */
} else {
/* branch */
WRITEW(Svp, READW(line) + 1);
if (fndln(&line)) break;
}
WRITEW(Pcc, READW(line));
ptr = line + 2 + 1;
}
} else {
if (n == 0) {
/* LIST */
for (ptr = Obj; ptr != READW(Bnd); ) {
putnm(READW(ptr));
ptr += 2;
putl(&ptr, '\0');
crlf();
}
} else {
unsigned short cur, src, dst, tmp;
unsigned short m;
/* DELETE */
WRITEW(Pcc, n);
if (!fndln(&cur) && READW(cur) == n) {
src = nxtln(cur);
for (dst = cur; src != READW(Bnd); WRITEB(dst++, READB(src++))) ;
WRITEW(Bnd, dst);
}
/* INSRT */
if (READB(ptr) == '\0') continue;
for (m = 3, tmp = ptr; READB(tmp) != '\0'; m++, tmp++) ;
if (READW(Bnd) + m < READW(Lmt)) {
src = READW(Bnd);
WRITEW(Bnd, READW(Bnd) + m);
for (dst = READW(Bnd); src != cur; WRITEB(--dst, READB(--src))) ;
WRITEW(src, n);
src += 2;
while (WRITEB(src++, READB(ptr++)) != '\0') ;
continue;
}
}
}
putstr("\r\nOK");
}
return 0;
}
/*
行番号が*Pcc以上の最小の行を探して，
見つかればその先頭番地を*ptrに入れて0を返し，見つからなければ1を返す．
*/
static int fndln(unsigned short *ptr) {
for (*ptr = Obj; *ptr != READW(Bnd); *ptr = nxtln(*ptr)) {
if (READW(*ptr) >= READW(Pcc)) return 0;
}
return 1;
}
/*
*ptrの次の行の先頭を見つけてその位置を返す
*/
static unsigned short nxtln(unsigned short ptr) {
for (ptr += 2; READB(ptr++) != '\0'; ) ;
return ptr;
}
/*
一行読み込んでlbfから始まるアドレスに格納する
*/
static void getln(unsigned short lbf) {
int p;
unsigned char c;
for (p = 0; ; ) {
c = getchr();
if (c == '\b') {
if (p > 0) p--;
} else if (c == '\r') {
WRITEB(lbf + p, '\0');
putchr('\n');
return;
} else if (c == 0x15 || p + 1 == 74) {
crlf();
p = 0;
} else if (c <= 0x1f) {
} else {
WRITEB(lbf + p++, c);
}
}
}
/*
**ptrが数字でなければ0を返す
数字の場合は，その数字をバイナリに変換して*nに入れ，
*ptrを数字の次のアドレスに進ませて，1を返す
*/
static int getnm(unsigned short *ptr, unsigned short *n) {
if (!num(*ptr)) return 0;
*n = 0;
do {
*n *= 10;
*n += READB((*ptr)++) - '0';
} while (num(*ptr));
return 1;
}
/*
*ptrが数字なら1，それ以外なら0を返す
*/
static int num(unsigned short ptr) {
return ('0' <= READB(ptr) && READB(ptr) <= '9');
}
/*
ptrから始まる文を実行する
*/
static void ordr(unsigned short ptr) {
unsigned char c;
unsigned short adr;
getvr(&ptr, &c, &adr); /* 左辺値のアドレスを求める */
ptr++; /* 代入の'='を読み飛ばす */
if (READB(ptr) == '"') {
ptr++;
putl(&ptr, '"');
if (READB(ptr) != ';') crlf();
} else {
unsigned short val;
expr(&ptr, &val); /* 右辺値を計算する */
if (c == '$') {
putchr(val & 0xff);
} else if ((c -= '?') == 0) {
putnm(val);
} else {
unsigned short r;
WRITEW(adr, val);
r = READW(Rnd);
r += val;
r = (r << 8) + (r >> 8);
WRITEW(Rnd, r);
}
}
return;
}
/*
*ptrで始まる値を計算し，*valに入れる
*/
static void expr(unsigned short *ptr, unsigned short *val) {
unsigned char c;
factr(ptr, val);
while ((c = READB(*ptr)) != '\0' && c != ')') {
term(ptr, val);
}
(*ptr)++;
return;
}
/*
*ptrから始まる値の要素を読み*valに入れる
*/
static void factr(unsigned short *ptr, unsigned short *val) {
unsigned char c;
if (READB(*ptr) == '\0') {
*val = 0;
return;
}
if (getnm(ptr, val)) return;
c = READB((*ptr)++);
if (c == '?') {
unsigned short tmp;
tmp = Lbf;
getln(tmp);
expr(&tmp, val);
} else if (c == '$') {
*val = getchr();;
} else if (c == '(') {
expr(ptr, val);
} else {
unsigned short adr;
(*ptr)--;
getvr(ptr, &c, &adr);
*val = READW(adr); /* 変数か配列の値を得る */
}
return;
}
/*
*ptrから始まる演算子と値の要素を読み演算結果を*valに入れる
*/
static void term(unsigned short *ptr, unsigned short *val) {
unsigned char c;
unsigned short val2;
c = READB((*ptr)++);
factr(ptr, &val2);
if (c == '*') {
*val *= val2;
} else if (c == '+') {
*val += val2;
} else if (c == '-') {
*val -= val2;
} else if (c == '/') {
WRITEW(Rmd, *val % val2);
*val /= val2;
} else if (c == '=') {
*val = (*val == val2);
} else if (c == '>') {
*val = (*val >= val2);
} else {
*val = (*val < val2);
}
return;
}
/*
*ptrから始まる変数・配列の文字を*cに入れてアドレスを*adr返す
*/
static void getvr(unsigned short *ptr, unsigned char *c, unsigned short *adr) {
unsigned short val;
*c = READB((*ptr)++);
if (*c == ':') {
expr(ptr, &val);
*adr = READW(Bnd) + val * 2;
} else {
*adr = ((*c & 0x3f) + 2) * 2;
}
return;
}
/*
文字dで終る文字列ptrを表示する
*/
static void putl(unsigned short *ptr, unsigned char d) {
while (READB(*ptr) != d) putchr(READB((*ptr)++));
(*ptr)++;
return;
}
/*
改行する
*/
static void crlf(void) {
putchr('\r');
putchr('\n');
return;
}
/*
数値xを表示する
*/
static void putnm(unsigned short x) {
unsigned short ptr;
unsigned char y;
ptr = Nbf + 5;
WRITEB(ptr, '\0');
do {
y = x % 10;
x /= 10;
WRITEB(--ptr, y + '0');
} while (x != 0);
putl(&ptr, '\0');
return;
}
/*
文字列strを表示して改行する
*/
static void putstr(char *str) {
while (*str != '\0') putchr(*(str++));
crlf();
return;
}