ref: 2459e34d77e2e21ef829c0dfaafd99433899494f
dir: /libtk/parse.c/
#include "lib9.h"
#include "kernel.h"
#include "draw.h"
#include "tk.h"
#define O(t, e) ((long)(&((t*)0)->e))
static char* pdist(TkTop*, TkOption*, void*, char**, char*, char*);
static char* pstab(TkTop*, TkOption*, void*, char**, char*, char*);
static char* ptext(TkTop*, TkOption*, void*, char**, char*, char*);
static char* pwinp(TkTop*, TkOption*, void*, char**, char*, char*);
static char* pbmap(TkTop*, TkOption*, void*, char**, char*, char*);
static char* pbool(TkTop*, TkOption*, void*, char**, char*, char*);
static char* pfont(TkTop*, TkOption*, void*, char**, char*, char*);
static char* pfrac(TkTop*, TkOption*, void*, char**, char*, char*);
static char* pnnfrac(TkTop*, TkOption*, void*, char**, char*, char*);
static char* pctag(TkTop*, TkOption*, void*, char**, char*, char*);
static char* ptabs(TkTop*, TkOption*, void*, char**, char*, char*);
static char* pcolr(TkTop*, TkOption*, void*, char**, char*, char*);
static char* pimag(TkTop*, TkOption*, void*, char**, char*, char*);
static char* psize(TkTop*, TkOption*, void*, char**, char*, char*);
static char* pnndist(TkTop*, TkOption*, void*, char**, char*, char*);
static char* pact(TkTop*, TkOption*, void*, char**, char*, char*);
static char* pignore(TkTop*, TkOption*, void*, char**, char*, char*);
static char* psticky(TkTop*, TkOption*, void*, char**, char*, char*);
static char* plist(TkTop*, TkOption*, void*, char**, char*, char*);
static char* (*oparse[])(TkTop*, TkOption*, void*, char**, char*, char*) =
{
/* OPTdist */ pdist,
/* OPTstab */ pstab,
/* OPTtext */ ptext,
/* OPTwinp */ pwinp,
/* OPTflag */ pstab,
/* OPTbmap */ pbmap,
/* OPTbool */ pbool,
/* OPTfont */ pfont,
/* OPTfrac */ pfrac,
/* OPTnnfrac */ pnnfrac,
/* OPTctag */ pctag,
/* OPTtabs */ ptabs,
/* OPTcolr */ pcolr,
/* OPTimag */ pimag,
/* OPTsize */ psize,
/* OPTnndist */ pnndist,
/* OPTact */ pact,
/* OPTignore */ pignore,
/* OPTsticky */ psticky,
/* OPTlist */ plist,
/* OPTflags */ pstab,
};
char*
tkskip(char *s, char *bl)
{
char *p;
while(*s) {
for(p = bl; *p; p++)
if(*p == *s)
break;
if(*p == '\0')
return s;
s++;
}
return s;
}
/* XXX - Tad: error propagation? */
char*
tkword(TkTop *t, char *str, char *buf, char *ebuf, int *gotarg)
{
int c, lev, tmp;
char *val, *e, *p, *cmd;
if (gotarg == nil)
gotarg = &tmp;
/*
* ebuf is one beyond last byte in buf; leave room for nul byte in
* all cases.
*/
--ebuf;
str = tkskip(str, " \t");
*gotarg = 1;
lev = 1;
switch(*str) {
case '{':
/* XXX - DBK: According to Ousterhout (p.37), while back=
* slashed braces don't count toward finding the matching
* closing braces, the backslashes should not be removed.
* Presumably this also applies to other backslashed
* characters: the backslash should not be removed.
*/
str++;
while(*str && buf < ebuf) {
c = *str++;
if(c == '\\') {
if(*str == '}' || *str == '{' || *str == '\\')
c = *str++;
} else if(c == '}') {
lev--;
if(lev == 0)
break;
} else if(c == '{')
lev++;
*buf++ = c;
}
break;
case '[':
/* XXX - DBK: According to Ousterhout (p. 33) command
* substitution may occur anywhere within a word, not
* only (as here) at the beginning.
*/
cmd = malloc(strlen(str)); /* not strlen+1 because the first character is skipped */
if ( cmd == nil ) {
buf[0] = '\0'; /* DBK - Why not an error message? */
return str;
}
p = cmd;
str++;
while(*str) {
c = *str++;
if(c == '\\') {
if(*str == ']' || *str == '[' || *str == '\\')
c = *str++;
} else if(c == ']') {
lev--;
if(lev == 0)
break;
} else if(c == '[')
lev++;
*p++ = c;
}
*p = '\0';
val = nil;
e = tkexec(t, cmd, &val);
free(cmd);
/* XXX - Tad: is this appropriate behavior?
* Am I sure that the error doesn't need to be
* propagated back to the caller?
*/
if(e == nil && val != nil) {
strncpy(buf, val, ebuf-buf);
buf = ebuf;
free(val);
}
break;
case '\'':
str++;
while(*str && buf < ebuf)
*buf++ = *str++;
break;
case '\0':
*gotarg = 0;
break;
default:
/* XXX - DBK: See comment above about command substitution.
* Also, any backslashed character should be replaced by
* itself (e.g. to put a space, tab, or [ into a word.
* We assume that the C compiler has already done the
* standard ANSI C substitutions. (But should we?)
*/
while(*str && *str != ' ' && *str != '\t' && buf < ebuf)
*buf++ = *str++;
}
*buf = '\0';
return str;
}
static TkOption*
Getopt(TkOption *o, char *buf)
{
while(o->o != nil) {
if(strcmp(buf, o->o) == 0)
return o;
o++;
}
return nil;
}
TkName*
tkmkname(char *name)
{
TkName *n;
n = malloc(sizeof(struct TkName)+strlen(name));
if(n == nil)
return nil;
strcpy(n->name, name);
n->link = nil;
n->obj = nil;
return n;
}
char*
tkparse(TkTop *t, char *str, TkOptab *ot, TkName **nl)
{
int l;
TkOptab *ft;
TkOption *o;
TkName *f, *n;
char *e, *buf, *ebuf;
l = strlen(str);
if (l < Tkmaxitem)
l = Tkmaxitem;
buf = malloc(l + 1);
if(buf == 0)
return TkNomem;
ebuf = buf + l + 1;
e = nil;
while(e == nil) {
str = tkword(t, str, buf, ebuf, nil);
switch(*buf) {
case '\0':
goto done;
case '-':
if (buf[1] != '\0') {
for(ft = ot; ft->ptr; ft++) {
o = Getopt(ft->optab, buf+1);
if(o != nil) {
e = oparse[o->type](t, o, ft->ptr, &str, buf, ebuf);
break;
}
}
if(ft->ptr == nil){
e = TkBadop;
tkerr(t, buf);
}
break;
}
/* fall through if we've got a singleton '-' */
default:
if(nl == nil) {
e = TkBadop;
tkerr(t, buf);
break;
}
n = tkmkname(buf);
if(n == nil) {
e = TkNomem;
break;
}
if(*nl == nil)
*nl = n;
else {
for(f = *nl; f->link; f = f->link)
;
f->link = n;
}
}
}
if(e != nil && nl != nil)
tkfreename(*nl);
done:
free(buf);
return e;
}
char*
tkconflist(TkOptab *ot, char **val)
{
TkOption *o;
char *f, *e;
f = "-%s";
while(ot->ptr != nil) {
o = ot->optab;
while(o->o != nil) {
e = tkvalue(val, f, o->o);
if(e != nil)
return e;
f = " -%s";
o++;
}
ot++;
}
return nil;
}
char*
tkgencget(TkOptab *ft, char *arg, char **val, TkTop *t)
{
Tk *w;
char *c;
Point g;
TkEnv *e;
TkStab *s;
TkOption *o;
int wh, con, i, n, flag, *v;
char *r, *buf, *fmt, *out;
buf = mallocz(Tkmaxitem, 0);
if(buf == nil)
return TkNomem;
tkitem(buf, arg);
r = buf;
if(*r == '-')
r++;
o = nil;
while(ft->ptr) {
o = Getopt(ft->optab, r);
if(o != nil)
break;
ft++;
}
if(o == nil) {
tkerr(t, r);
free(buf);
return TkBadop;
}
switch(o->type) {
default:
tkerr(t, r);
free(buf);
return TkBadop;
case OPTignore:
return nil;
case OPTact:
w = ft->ptr;
g = tkposn(w);
n = g.y;
if(o->aux == 0)
n = g.x;
free(buf);
return tkvalue(val, "%d", n);
case OPTdist:
case OPTnndist:
free(buf);
return tkvalue(val, "%d", OPTION(ft->ptr, int, o->offset));
case OPTsize:
w = ft->ptr;
if(strcmp(r, "width") == 0)
wh = w->req.width;
else
wh = w->req.height;
free(buf);
return tkvalue(val, "%d", wh);
case OPTtext:
c = OPTION(ft->ptr, char*, o->offset);
if(c == nil)
c = "";
free(buf);
return tkvalue(val, "%s", c);
case OPTwinp:
w = OPTION(ft->ptr, Tk*, o->offset);
if(w == nil || w->name == nil)
c = "";
else
c = w->name->name;
free(buf);
return tkvalue(val, "%s", c);
case OPTstab:
s = o->aux;
c = "";
con = OPTION(ft->ptr, int, o->offset);
while(s->val) {
if(con == s->con) {
c = s->val;
break;
}
s++;
}
free(buf);
return tkvalue(val, "%s", c);
case OPTflag:
con = OPTION(ft->ptr, int, o->offset);
flag = 0;
for (s = o->aux; s->val != nil; s++)
flag |= s->con;
c = "";
for (s = o->aux; s->val != nil; s++) {
if ((con & flag) == s->con) {
c = s->val;
break;
}
}
free(buf);
return tkvalue(val, "%s", c);
case OPTflags:
con = OPTION(ft->ptr, int, o->offset);
out = mallocz(Tkmaxitem, 0);
if(out == nil) {
free(buf);
return TkNomem;
}
c = out;
for (s = o->aux; s->val != nil; s++) {
if (s->con == (s->con&-s->con) && (con & s->con) != 0)
c = seprint(c, out+Tkmaxitem, " %s", s->val); /* should this be quoted? */
}
free(buf);
*c = 0;
r = tkvalue(val, "%s", out);
free(out);
return r;
case OPTfont:
e = OPTION(ft->ptr, TkEnv*, o->offset);
free(buf);
if (e->font != nil)
return tkvalue(val, "%s", e->font->name);
return nil;
case OPTcolr:
e = OPTION(ft->ptr, TkEnv*, o->offset);
i = AUXI(o->aux);
free(buf);
return tkvalue(val, "#%.8lux", e->colors[i]);
case OPTfrac:
case OPTnnfrac:
v = &OPTION(ft->ptr, int, o->offset);
n = (int)o->aux;
if(n == 0)
n = 1;
fmt = "%s";
for(i = 0; i < n; i++) {
tkfprint(buf, *v++);
r = tkvalue(val, fmt, buf);
if(r != nil) {
free(buf);
return r;
}
fmt = " %s";
}
free(buf);
return nil;
case OPTbmap:
//free(buf);
return tkvalue(val, "%d", OPTION(ft->ptr, Image*, o->offset) != nil);
case OPTimag:
//free(buf);
return tkvalue(val, "%d", OPTION(ft->ptr, TkImg*, o->offset) != nil);
}
}
static char*
pact(TkTop *t, TkOption *o, void *place, char **str, char *buf, char *ebuf)
{
USED(buf);
USED(ebuf);
USED(str);
USED(place);
tkerr(t, o->o);
return TkBadop;
}
static char*
pignore(TkTop *t, TkOption *o, void *place, char **str, char *buf, char *ebuf)
{
char *p;
USED(t);
USED(o);
USED(place);
p = tkword(t, *str, buf, ebuf, nil);
if(*buf == '\0')
return TkOparg;
*str = p;
return nil;
}
static char*
pdist(TkTop *t, TkOption *o, void *place, char **str, char *buf, char *ebuf)
{
int d;
char *e;
TkEnv *env;
USED(buf);
USED(ebuf);
/*
* this is a bit of a hack, as 0 is a valid option offset,
* but a nil aux is commonly used when 'w' and 'h' suffixes
* aren't appropriate.
* just make sure that no structure placed in TkOptab->ptr
* with an OPTdist element has a TkEnv as its first member.
*/
if (o->aux == nil)
env = nil;
else
env = OPTION(place, TkEnv*, AUXI(o->aux));
e = tkfracword(t, str, &d, env);
if(e != nil)
return e;
OPTION(place, int, o->offset) = TKF2I(d);
return nil;
}
static char*
pnndist(TkTop *t, TkOption *o, void *place, char **str, char *buf, char *ebuf)
{
char* e;
int oldv;
oldv = OPTION(place, int, o->offset);
e = pdist(t, o, place, str, buf, ebuf);
if(e == nil && OPTION(place, int, o->offset) < 0) {
OPTION(place, int, o->offset) = oldv;
return TkBadvl;
}
return e;
}
static char*
psize(TkTop *t, TkOption *o, void *place, char **str, char *buf, char *ebuf)
{
Tk *tk;
char *e;
int d, off;
USED(ebuf);
e = tkfracword(t, str, &d, OPTION(place, TkEnv*, AUXI(o->aux)));
if (e != nil)
return e;
if(d < 0)
return TkBadvl;
tk = place;
/*
* XXX there's no way of resetting Tksetwidth or Tksetheight.
* could perhaps allow it by setting width/height to {}
*/
if(strcmp(buf+1, "width") == 0) {
tk->flag |= Tksetwidth;
off = O(Tk, req.width);
}
else {
tk->flag |= Tksetheight;
off = O(Tk, req.height);
}
OPTION(place, int, off) = TKF2I(d);
return nil;
}
static TkStab*
lookstab(TkStab *s, char *word)
{
for(; s->val != nil; s++)
if(strcmp(s->val, word) == 0)
return s;
return nil;
}
static char*
pstab(TkTop *t, TkOption *o, void *place, char **str, char *buf, char *ebuf)
{
char *p, *fields[8];
int mask, val, nf;
TkStab *s, *c;
p = tkword(t, *str, buf, ebuf, nil);
if(*buf == '\0')
return TkOparg;
if(o->type == OPTstab) {
s = lookstab(o->aux, buf);
if(s == nil)
return TkBadvl;
*str = p;
OPTION(place, int, o->offset) = s->con;
return nil;
}
nf = getfields(buf, fields, nelem(fields), 1, " \t,");
if(nf < 1 || nf > 1 && o->type != OPTflags)
return TkBadvl;
mask = 0;
for(c = o->aux; c->val; c++)
mask |= c->con;
val = 0;
while(--nf >= 0) {
s = lookstab(o->aux, fields[nf]);
if(s == nil)
return TkBadvl;
val |= s->con;
}
*str = p;
OPTION(place, int, o->offset) &= ~mask;
OPTION(place, int, o->offset) |= val;
/*
* a hack, but otherwise we have to dirty the focus order
* every time any command is executed on a widget
*/
if(strcmp(o->o, "takefocus") == 0)
tkdirtyfocusorder(t);
return nil;
}
enum {
Stickyn = (1<<0),
Stickye = (1<<1),
Stickys = (1<<2),
Stickyw = (1<<3)
};
static int stickymap[16] =
{
0,
Tknorth,
Tkeast,
Tknorth|Tkeast,
Tksouth,
Tkfilly,
Tksouth|Tkeast,
Tkeast|Tkfilly,
Tkwest,
Tknorth|Tkwest,
Tkfillx,
Tknorth|Tkfillx,
Tksouth|Tkwest,
Tkwest|Tkfilly,
Tksouth|Tkfillx,
Tkfillx|Tkfilly,
};
static char*
psticky(TkTop *t, TkOption *o, void *place, char **str, char *buf, char *ebuf)
{
char *p, *s;
int flag, sflag;
p = tkword(t, *str, buf, ebuf, nil);
*str = p;
flag = 0;
for (s = buf; *s; s++) {
switch (*s) {
case 'n':
flag |= Stickyn;
break;
case 's':
flag |= Stickys;
break;
case 'e':
flag |= Stickye;
break;
case 'w':
flag |= Stickyw;
break;
case ' ':
case ',':
break;
default:
return TkBadvl;
}
}
sflag = OPTION(place, int, o->offset) & ~(Tkanchor|Tkfill);
OPTION(place, int, o->offset) = sflag | stickymap[flag];
return nil;
}
static char*
ptext(TkTop *t, TkOption *o, void *place, char **str, char *buf, char *ebuf)
{
char **p;
*str = tkword(t, *str, buf, ebuf, nil);
p = &OPTION(place, char*, o->offset);
if(*p != nil)
free(*p);
if(buf[0] == '\0')
*p = nil;
else {
*p = strdup(buf);
if(*p == nil)
return TkNomem;
}
return nil;
}
static char*
pimag(TkTop *t, TkOption *o, void *place, char **str, char *buf, char *ebuf)
{
int locked;
Display *d;
TkImg **p, *i;
i = nil;
p = &OPTION(place, TkImg*, o->offset);
*str = tkword(t, *str, buf, ebuf, nil);
if(*buf != '\0') {
i = tkname2img(t, buf);
if(i == nil)
return TkBadvl;
i->ref++;
}
if(*p != nil) {
d = t->display;
locked = lockdisplay(d);
tkimgput(*p);
if(locked)
unlockdisplay(d);
}
*p = i;
return nil;
}
static char*
pbmap(TkTop *t, TkOption *o, void *place, char **str, char *buf, char *ebuf)
{
Display *d;
Image *i, **p;
int locked, fd;
char *c;
p = &OPTION(place, Image*, o->offset);
d = t->display;
*str = tkword(t, *str, buf, ebuf, nil);
if(*buf == '\0' || *buf == '-') {
if(*p != nil) {
locked = lockdisplay(d);
freeimage(*p);
if(locked)
unlockdisplay(d);
*p = nil;
}
return nil;
}
if(buf[0] == '@')
i = display_open(d, buf+1);
else if(buf[0] == '<') {
buf++;
fd = strtoul(buf, &c, 0);
if(c == buf) {
return TkBadvl;
}
i = readimage(d, fd, 1);
}
else {
char *file;
file = mallocz(Tkmaxitem, 0);
if(file == nil)
return TkNomem;
snprint(file, Tkmaxitem, "/icons/tk/%s", buf);
i = display_open(d, file);
free(file);
}
if(i == nil)
return TkBadbm;
if(*p != nil) {
locked = lockdisplay(d);
freeimage(*p);
if(locked)
unlockdisplay(d);
}
*p = i;
return nil;
}
static char*
pfont(TkTop *t, TkOption *o, void *place, char **str, char *buf, char *ebuf)
{
TkEnv *e;
Display *d;
int locked;
Font *font;
*str = tkword(t, *str, buf, ebuf, nil);
if(*buf == '\0')
return TkOparg;
d = t->display;
font = font_open(d, buf);
if(font == nil)
return TkBadft;
e = tkdupenv(&OPTION(place, TkEnv*, o->offset));
if(e == nil) {
freefont(font); /* XXX lockdisplay around this? */
return TkNomem;
}
if(e->font)
font_close(e->font);
e->font = font;
locked = lockdisplay(d);
e->wzero = stringwidth(font, "0");
if ( e->wzero <= 0 )
e->wzero = e->font->height / 2;
if(locked)
unlockdisplay(d);
return nil;
}
static int
hex(int c)
{
if(c >= 'a')
c -= 'a'-'A';
if(c >= 'A')
c = 10 + (c - 'A');
else
c -= '0';
return c;
}
static ulong
changecol(TkEnv *e, int setcol, int col, ulong rgba)
{
if (setcol) {
e->set |= (1<<col);
} else {
rgba = 0;
e->set &= ~(1<<col);
}
e->colors[col] = rgba;
return rgba;
}
char*
tkparsecolor(char *buf, ulong *rgba)
{
char *p, *q, *e;
int R, G, B, A;
int i, alpha, len, alen;
/*
* look for alpha modifier in *#AA or *0.5 format
*/
len = strlen(buf);
p = strchr(buf, '*');
if(p != nil) {
alen = len - (p - buf);
if(p[1] == '#') {
if(alen != 4)
return TkBadvl;
alpha = (hex(p[2])<<4) | (hex(p[3]));
} else {
q = p+1;
e = tkfrac(&q, &alpha, nil);
if (e != nil)
return e;
alpha = TKF2I(alpha * 0xff);
}
*p = '\0';
len -= alen;
} else
alpha = 0xff;
if (*buf == '#') {
switch(len) {
case 4: /* #RGB */
R = hex(buf[1]);
G = hex(buf[2]);
B = hex(buf[3]);
*rgba = (R<<28) | (G<<20) | (B<<12) | 0xff;
break;
case 7: /* #RRGGBB */
R = (hex(buf[1])<<4)|(hex(buf[2]));
G = (hex(buf[3])<<4)|(hex(buf[4]));
B = (hex(buf[5])<<4)|(hex(buf[6]));
*rgba = (R<<24) | (G<<16) | (B<<8) | 0xff;
break;
case 9: /* #RRGGBBAA */
R = (hex(buf[1])<<4)|(hex(buf[2]));
G = (hex(buf[3])<<4)|(hex(buf[4]));
B = (hex(buf[5])<<4)|(hex(buf[6]));
A = (hex(buf[7])<<4)|(hex(buf[8]));
*rgba = (R<<24) | (G<<16) | (B<<8) | A;
break;
default:
return TkBadvl;
}
} else {
for(i = 0; tkcolortab[i].val != nil; i++)
if (!strcmp(tkcolortab[i].val, buf))
break;
if (tkcolortab[i].val == nil)
return TkBadvl;
*rgba = tkcolortab[i].con;
}
if (alpha != 0xff) {
tkrgbavals(*rgba, &R, &G, &B, &A);
A = (A * alpha) / 255;
*rgba = tkrgba(R, G, B, A);
}
return nil;
}
static char*
pcolr(TkTop *t, TkOption *o, void *place, char **str, char *buf, char *ebuf)
{
TkEnv *env;
char *e;
ulong rgba, dark, light;
int color, setcol;
*str = tkword(t, *str, buf, ebuf, nil);
rgba = 0;
if(*buf == '\0') {
setcol = 0;
} else {
setcol = 1;
e = tkparsecolor(buf, &rgba);
if(e != nil)
return e;
}
env = tkdupenv(&OPTION(place, TkEnv*, o->offset));
if(env == nil)
return TkNomem;
color = AUXI(o->aux);
rgba = changecol(env, setcol, color, rgba);
if(color == TkCbackgnd || color == TkCselectbgnd || color == TkCactivebgnd) {
if (setcol) {
light = tkrgbashade(rgba, TkLightshade);
dark = tkrgbashade(rgba, TkDarkshade);
} else
light = dark = 0;
changecol(env, setcol, color+1, light);
changecol(env, setcol, color+2, dark);
}
return nil;
}
static char*
pbool(TkTop *t, TkOption *o, void *place, char **str, char *buf, char *ebuf)
{
USED(buf);
USED(ebuf);
USED(str);
USED(t);
OPTION(place, int, o->offset) = 1;
return nil;
}
static char*
pwinp(TkTop *t, TkOption *o, void *place, char **str, char *buf, char *ebuf)
{
Tk *f;
char *p;
p = tkword(t, *str, buf, ebuf, nil);
if(*buf == '\0')
return TkOparg;
*str = p;
f = tklook(t, buf, 0);
if(f == nil){
tkerr(t, buf);
return TkBadwp;
}
OPTION(place, Tk*, o->offset) = f;
return nil;
}
static char*
pctag(TkTop *t, TkOption *o, void *place, char **str, char *buf, char *ebuf)
{
char *p;
TkName *n, *l;
*str = tkword(t, *str, buf, ebuf, nil);
l = nil;
p = buf;
while(*p) {
p = tkskip(p, " \t");
buf = p;
while(*p && *p != ' ' && *p != '\t')
p++;
if(*p != '\0')
*p++ = '\0';
if(p == buf || buf[0] >= '0' && buf[0] <= '9') {
tkfreename(l);
return TkBadtg;
}
n = tkmkname(buf);
if(n == nil) {
tkfreename(l);
return TkNomem;
}
n->link = l;
l = n;
}
tkfreename(OPTION(place, TkName*, o->offset));
OPTION(place, TkName*, o->offset) = l;
return nil;
}
static char*
pfrac(TkTop *t, TkOption *o, void *place, char **str, char *buf, char *ebuf)
{
char *p, *e;
int i, n, d, *v;
*str = tkword(t, *str, buf, ebuf, nil);
v = &OPTION(place, int, o->offset);
n = (int)o->aux;
if(n == 0)
n = 1;
p = buf;
for(i = 0; i < n; i++) {
p = tkskip(p, " \t");
if(*p == '\0')
return TkOparg;
e = tkfracword(t, &p, &d, nil);
if (e != nil)
return e;
*v++ = d;
}
return nil;
}
/*
* N.B. nnfrac only accepts aux==nil (can't deal with several items)
*/
static char*
pnnfrac(TkTop *t, TkOption *o, void *place, char **str, char *buf, char *ebuf)
{
int oldv;
char *e;
oldv = OPTION(place, int, o->offset);
e = pfrac(t, o, place, str, buf, ebuf);
if(e == nil && OPTION(place, int, o->offset) < 0) {
OPTION(place, int, o->offset) = oldv;
return TkBadvl;
}
return e;
}
typedef struct Tabspec {
int dist;
int just;
TkEnv *env;
} Tabspec;
static char*
ptabs(TkTop *t, TkOption *o, void *place, char **str, char *buf, char *ebuf)
{
char *e, *p, *eibuf;
TkOption opd, opj;
Tabspec tspec;
TkTtabstop *tabfirst, *tab, *tabprev;
char *ibuf;
ibuf = mallocz(Tkmaxitem, 0);
if(ibuf == nil)
return TkNomem;
eibuf = ibuf + Tkmaxitem;
tspec.env = OPTION(place, TkEnv*, AUXI(o->aux));
opd.offset = O(Tabspec, dist);
opd.aux = IAUX(O(Tabspec, env));
opj.offset = O(Tabspec, dist);
opj.aux = tktabjust;
tabprev = nil;
tabfirst = nil;
p = tkword(t, *str, buf, ebuf, nil);
if(*buf == '\0') {
free(ibuf);
return TkOparg;
}
*str = p;
p = buf;
while(*p != '\0') {
e = pdist(t, &opd, &tspec, &p, ibuf, eibuf);
if(e != nil) {
free(ibuf);
return e;
}
e = pstab(t, &opj, &tspec, &p, ibuf, eibuf);
if(e != nil)
tspec.just = Tkleft;
tab = malloc(sizeof(TkTtabstop));
if(tab == nil) {
free(ibuf);
return TkNomem;
}
tab->pos = tspec.dist;
tab->justify = tspec.just;
tab->next = nil;
if(tabfirst == nil)
tabfirst = tab;
else
tabprev->next = tab;
tabprev = tab;
}
free(ibuf);
tab = OPTION(place, TkTtabstop*, o->offset);
if(tab != nil)
free(tab);
OPTION(place, TkTtabstop*, o->offset) = tabfirst;
return nil;
}
char*
tkxyparse(Tk* tk, char **parg, Point *p)
{
char *buf;
buf = mallocz(Tkmaxitem, 0);
if(buf == nil)
return TkNomem;
*parg = tkword(tk->env->top, *parg, buf, buf+Tkmaxitem, nil);
if(*buf == '\0') {
free(buf);
return TkOparg;
}
p->x = atoi(buf);
*parg = tkword(tk->env->top, *parg, buf, buf+Tkmaxitem, nil);
if(*buf == '\0') {
free(buf);
return TkOparg;
}
p->y = atoi(buf);
free(buf);
return nil;
}
static char*
plist(TkTop *t, TkOption *o, void *place, char **str, char *buf, char *ebuf)
{
char *w, ***p, *wbuf, *ewbuf, **v, **nv;
int n, m, i, found;
*str = tkword(t, *str, buf, ebuf, nil);
n = strlen(buf) + 1;
wbuf = mallocz(n, 0);
if (wbuf == nil)
return TkNomem; /* XXX should we free old values too? */
ewbuf = &wbuf[n];
p = &OPTION(place, char**, o->offset);
if (*p != nil){
for (v = *p; *v; v++)
free(*v);
free(*p);
}
n = 0;
m = 4;
w = buf;
v = malloc(m * sizeof(char*));
if (v == nil)
goto Error;
for (;;) {
w = tkword(t, w, wbuf, ewbuf, &found);
if (!found)
break;
if (n == m - 1) {
m += m/2;
nv = realloc(v, m * sizeof(char*));
if (nv == nil)
goto Error;
v = nv;
}
v[n] = strdup(wbuf);
if (v[n] == nil)
goto Error;
n++;
}
v[n++] = nil;
*p = realloc(v, n * sizeof(char*));
free(wbuf);
return nil;
Error:
free(buf);
for (i = 0; i < n; i++)
free(v[i]);
free(v);
*p = nil;
return TkNomem;
}