ref: 3d5dca521797b5a91ebc4281fbaf58211bb4f40f
dir: /sys/src/cmd/cpp/tokens.c/
#include <u.h>
#include <libc.h>
#include <stdio.h>
#include "cpp.h"
static char wbuf[2*OBS];
static char *wbp = wbuf;
/*
* 1 for tokens that don't need whitespace when they get inserted
* by macro expansion
*/
static char wstab[] = {
0, /* END */
0, /* UNCLASS */
0, /* NAME */
0, /* NUMBER */
0, /* STRING */
0, /* CCON */
1, /* NL */
0, /* WS */
0, /* DSHARP */
0, /* EQ */
0, /* NEQ */
0, /* LEQ */
0, /* GEQ */
0, /* LSH */
0, /* RSH */
0, /* LAND */
0, /* LOR */
0, /* PPLUS */
0, /* MMINUS */
0, /* ARROW */
1, /* SBRA */
1, /* SKET */
1, /* LP */
1, /* RP */
0, /* DOT */
0, /* AND */
0, /* STAR */
0, /* PLUS */
0, /* MINUS */
0, /* TILDE */
0, /* NOT */
0, /* SLASH */
0, /* PCT */
0, /* LT */
0, /* GT */
0, /* CIRC */
0, /* OR */
0, /* QUEST */
0, /* COLON */
0, /* ASGN */
1, /* COMMA */
0, /* SHARP */
1, /* SEMIC */
1, /* CBRA */
1, /* CKET */
0, /* ASPLUS */
0, /* ASMINUS */
0, /* ASSTAR */
0, /* ASSLASH */
0, /* ASPCT */
0, /* ASCIRC */
0, /* ASLSH */
0, /* ASRSH */
0, /* ASOR */
0, /* ASAND */
0, /* ELLIPS */
0, /* DSHARP1 */
0, /* NAME1 */
0, /* DEFINED */
0, /* UMINUS */
};
void
maketokenrow(int size, Tokenrow *trp)
{
trp->max = size;
if (size>0)
trp->bp = (Token *)domalloc(size*sizeof(Token));
else
trp->bp = NULL;
trp->tp = trp->bp;
trp->lp = trp->bp;
}
Token *
growtokenrow(Tokenrow *trp)
{
int ncur = trp->tp - trp->bp;
int nlast = trp->lp - trp->bp;
trp->max = 3*trp->max/2 + 1;
trp->bp = (Token *)dorealloc(trp->bp, trp->max*sizeof(Token));
trp->lp = &trp->bp[nlast];
trp->tp = &trp->bp[ncur];
return trp->lp;
}
/*
* Compare a row of tokens, ignoring the content of WS; return !=0 if different
*/
int
comparetokens(Tokenrow *tr1, Tokenrow *tr2)
{
Token *tp1, *tp2;
tp1 = tr1->tp;
tp2 = tr2->tp;
if (tr1->lp-tp1 != tr2->lp-tp2)
return 1;
for (; tp1<tr1->lp ; tp1++, tp2++) {
if (tp1->type != tp2->type
|| (tp1->wslen==0) != (tp2->wslen==0)
|| tp1->len != tp2->len
|| strncmp((char*)tp1->t, (char*)tp2->t, tp1->len)!=0)
return 1;
}
return 0;
}
/*
* replace ntok tokens starting at dtr->tp with the contents of str.
* tp ends up pointing just beyond the replacement.
* Canonical whitespace is assured on each side.
*/
void
insertrow(Tokenrow *dtr, int ntok, Tokenrow *str)
{
int nrtok = rowlen(str);
dtr->tp += ntok;
adjustrow(dtr, nrtok-ntok);
dtr->tp -= ntok;
movetokenrow(dtr, str);
makespace(dtr);
dtr->tp += nrtok;
makespace(dtr);
}
/*
* make sure there is WS before trp->tp, if tokens might merge in the output
*/
void
makespace(Tokenrow *trp)
{
uchar *tt;
Token *tp = trp->tp;
if (tp >= trp->lp)
return;
if (tp->wslen) {
if (tp->flag&XPWS
&& (wstab[tp->type] || trp->tp>trp->bp && wstab[(tp-1)->type])) {
tp->wslen = 0;
return;
}
tp->t[-1] = ' ';
return;
}
if (wstab[tp->type] || trp->tp>trp->bp && wstab[(tp-1)->type])
return;
tt = newstring(tp->t, tp->len, 1);
*tt++ = ' ';
tp->t = tt;
tp->wslen = 1;
tp->flag |= XPWS;
}
/*
* Copy an entire tokenrow into another, at tp.
* It is assumed that there is enough space.
* Not strictly conforming.
*/
void
movetokenrow(Tokenrow *dtr, Tokenrow *str)
{
int nby;
/* nby = sizeof(Token) * (str->lp - str->bp); */
nby = (char *)str->lp - (char *)str->bp;
memmove(dtr->tp, str->bp, nby);
}
/*
* Move the tokens in a row, starting at tr->tp, rightward by nt tokens;
* nt may be negative (left move).
* The row may need to be grown.
* Non-strictly conforming because of the (char *), but easily fixed
*/
void
adjustrow(Tokenrow *trp, int nt)
{
int nby, size;
if (nt==0)
return;
size = (trp->lp - trp->bp) + nt;
while (size > trp->max)
growtokenrow(trp);
/* nby = sizeof(Token) * (trp->lp - trp->tp); */
nby = (char *)trp->lp - (char *)trp->tp;
if (nby)
memmove(trp->tp+nt, trp->tp, nby);
trp->lp += nt;
}
/*
* Copy a row of tokens into the destination holder, allocating
* the space for the contents. Return the destination.
*/
Tokenrow *
copytokenrow(Tokenrow *dtr, Tokenrow *str)
{
int len = rowlen(str);
maketokenrow(len, dtr);
movetokenrow(dtr, str);
dtr->lp += len;
return dtr;
}
/*
* Produce a copy of a row of tokens. Start at trp->tp.
* The value strings are copied as well. The first token
* has WS available.
*/
Tokenrow *
normtokenrow(Tokenrow *trp)
{
Token *tp;
Tokenrow *ntrp = new(Tokenrow);
int len;
len = trp->lp - trp->tp;
if (len<=0)
len = 1;
maketokenrow(len, ntrp);
for (tp=trp->tp; tp < trp->lp; tp++) {
*ntrp->lp = *tp;
if (tp->len) {
ntrp->lp->t = newstring(tp->t, tp->len, 1);
*ntrp->lp->t++ = ' ';
if (tp->wslen)
ntrp->lp->wslen = 1;
}
ntrp->lp++;
}
if (ntrp->lp > ntrp->bp)
ntrp->bp->wslen = 0;
return ntrp;
}
/*
* Debugging
*/
void
peektokens(Tokenrow *trp, char *str)
{
Token *tp;
int c;
tp = trp->tp;
flushout();
if (str)
fprintf(stderr, "%s ", str);
if (tp<trp->bp || tp>trp->lp)
fprintf(stderr, "(tp offset %d) ", tp-trp->bp);
for (tp=trp->bp; tp<trp->lp && tp<trp->bp+32; tp++) {
if (tp->type!=NL) {
c = tp->t[tp->len];
tp->t[tp->len] = 0;
fprintf(stderr, "%s", tp->t, tp->len);
tp->t[tp->len] = c;
}
if (tp->type==NAME) {
fprintf(stderr, tp==trp->tp?"{*":"{");
prhideset(tp->hideset);
fprintf(stderr, "} ");
} else
fprintf(stderr, tp==trp->tp?"{%x*} ":"{%x} ", tp->type);
}
fprintf(stderr, "\n");
fflush(stderr);
}
void
puttokens(Tokenrow *trp)
{
Token *tp;
int len;
uchar *p;
if (verbose)
peektokens(trp, "");
tp = trp->bp;
for (; tp<trp->lp; tp++) {
len = tp->len+tp->wslen;
p = tp->t-tp->wslen;
while (tp<trp->lp-1 && p+len == (tp+1)->t - (tp+1)->wslen) {
tp++;
len += tp->wslen+tp->len;
}
if (Mflag==0) {
if (len>OBS/2) { /* handle giant token */
if (wbp > wbuf)
write(1, wbuf, wbp-wbuf);
write(1, p, len);
wbp = wbuf;
} else {
memcpy(wbp, p, len);
wbp += len;
}
}
if (wbp >= &wbuf[OBS]) {
write(1, wbuf, OBS);
if (wbp > &wbuf[OBS])
memcpy(wbuf, wbuf+OBS, wbp - &wbuf[OBS]);
wbp -= OBS;
}
}
trp->tp = tp;
if (cursource->fd==0)
flushout();
}
void
flushout(void)
{
if (wbp>wbuf) {
write(1, wbuf, wbp-wbuf);
wbp = wbuf;
}
}
/*
* turn a row into just a newline
*/
void
setempty(Tokenrow *trp)
{
trp->tp = trp->bp;
trp->lp = trp->bp+1;
*trp->bp = nltoken;
}
/*
* generate a number
*/
char *
outnum(char *p, int n)
{
if (n>=10)
p = outnum(p, n/10);
*p++ = n%10 + '0';
return p;
}
/*
* allocate and initialize a new string from s, of length l, at offset o
* Null terminated.
*/
uchar *
newstring(uchar *s, int l, int o)
{
uchar *ns = (uchar *)domalloc(l+o+1);
ns[l+o] = '\0';
return (uchar*)strncpy((char*)ns+o, (char*)s, l) - o;
}