ref: 0ab5d34be4b8b9faa96d4691de95d6ae8c691f0b
dir: /sys/src/ape/cmd/make/gram.y/
%{#include "defs.h"
%}
%term NAME SHELLINE START MACRODEF COLON DOUBLECOLON GREATER AMPER AMPERAMPER
%union
{
struct shblock *yshblock;
depblkp ydepblock;
nameblkp ynameblock;
}
%type <yshblock> SHELLINE, shlist, shellist
%type <ynameblock> NAME, namelist
%type <ydepblock> deplist, dlist
%%
%{
struct depblock *pp;
static struct shblock *prevshp;
static struct nameblock *lefts[NLEFTS];
struct nameblock *leftp;
static int nlefts;
struct lineblock *lp, *lpp;
static struct depblock *prevdep;
static int sepc;
static int allnowait;
static struct fstack
{
FILE *fin;
char *fname;
int lineno;
} filestack[MAXINCLUDE];
static int ninclude = 0;
%}
file:
| file comline
;
comline: START
| MACRODEF
| START namelist deplist shellist = {
while( --nlefts >= 0)
{
wildp wp;
leftp = lefts[nlefts];
if(wp = iswild(leftp->namep))
{
leftp->septype = SOMEDEPS;
if(lastwild)
lastwild->next = wp;
else
firstwild = wp;
lastwild = wp;
}
if(leftp->septype == 0)
leftp->septype = sepc;
else if(leftp->septype != sepc)
{
if(! wp)
fprintf(stderr,
"Inconsistent rules lines for `%s'\n",
leftp->namep);
}
else if(sepc==ALLDEPS && leftp->namep[0]!='.' && $4!=0)
{
for(lp=leftp->linep; lp->nxtlineblock; lp=lp->nxtlineblock)
if(lp->shp)
fprintf(stderr,
"Multiple rules lines for `%s'\n",
leftp->namep);
}
lp = ALLOC(lineblock);
lp->nxtlineblock = NULL;
lp->depp = $3;
lp->shp = $4;
if(wp)
wp->linep = lp;
if(equal(leftp->namep, ".SUFFIXES") && $3==0)
leftp->linep = 0;
else if(leftp->linep == 0)
leftp->linep = lp;
else {
for(lpp = leftp->linep; lpp->nxtlineblock;
lpp = lpp->nxtlineblock) ;
if(sepc==ALLDEPS && leftp->namep[0]=='.')
lpp->shp = 0;
lpp->nxtlineblock = lp;
}
}
}
| error
;
namelist: NAME = { lefts[0] = $1; nlefts = 1; }
| namelist NAME = { lefts[nlefts++] = $2;
if(nlefts>=NLEFTS) fatal("Too many lefts"); }
;
deplist:
{
char junk[100];
sprintf(junk, "%s:%d", filestack[ninclude-1].fname, yylineno);
fatal1("Must be a separator on rules line %s", junk);
}
| dlist
;
dlist: sepchar = { prevdep = 0; $$ = 0; allnowait = NO; }
| sepchar AMPER = { prevdep = 0; $$ = 0; allnowait = YES; }
| dlist NAME = {
pp = ALLOC(depblock);
pp->nxtdepblock = NULL;
pp->depname = $2;
pp->nowait = allnowait;
if(prevdep == 0) $$ = pp;
else prevdep->nxtdepblock = pp;
prevdep = pp;
}
| dlist AMPER = { if(prevdep) prevdep->nowait = YES; }
| dlist AMPERAMPER
;
sepchar: COLON = { sepc = ALLDEPS; }
| DOUBLECOLON = { sepc = SOMEDEPS; }
;
shellist: = {$$ = 0; }
| shlist = { $$ = $1; }
;
shlist: SHELLINE = { $$ = $1; prevshp = $1; }
| shlist SHELLINE = { $$ = $1;
prevshp->nxtshblock = $2;
prevshp = $2;
}
;
%%
static char *zznextc; /* null if need another line;
otherwise points to next char */
static int yylineno;
static FILE * fin;
static int retsh(char *);
static int nextlin(void);
static int isinclude(char *);
int yyparse(void);
int
parse(char *name)
{
FILE *stream;
if(name == CHNULL)
{
stream = NULL;
name = "(builtin-rules)";
}
else if(equal(name, "-"))
{
stream = stdin;
name = "(stdin)";
}
else if( (stream = fopen(name, "r")) == NULL)
return NO;
filestack[0].fname = copys(name);
ninclude = 1;
fin = stream;
yylineno = 0;
zznextc = 0;
if( yyparse() )
fatal("Description file error");
if(fin)
fclose(fin);
return YES;
}
int
yylex(void)
{
char *p;
char *q;
char word[INMAX];
if(! zznextc )
return nextlin() ;
while( isspace(*zznextc) )
++zznextc;
switch(*zznextc)
{
case '\0':
return nextlin() ;
case '|':
if(zznextc[1]==':')
{
zznextc += 2;
return DOUBLECOLON;
}
break;
case ':':
if(*++zznextc == ':')
{
++zznextc;
return DOUBLECOLON;
}
return COLON;
case '>':
++zznextc;
return GREATER;
case '&':
if(*++zznextc == '&')
{
++zznextc;
return AMPERAMPER;
}
return AMPER;
case ';':
return retsh(zznextc) ;
}
p = zznextc;
q = word;
while( ! ( funny[*p] & TERMINAL) )
*q++ = *p++;
if(p != zznextc)
{
*q = '\0';
if((yylval.ynameblock=srchname(word))==0)
yylval.ynameblock = makename(word);
zznextc = p;
return NAME;
}
else {
char junk[100];
sprintf(junk, "Bad character %c (octal %o), line %d of file %s",
*zznextc, *zznextc, yylineno, filestack[ninclude-1].fname);
fatal(junk);
}
return 0; /* never executed */
}
static int
retsh(char *q)
{
register char *p;
struct shblock *sp;
for(p=q+1 ; *p==' '||*p=='\t' ; ++p) ;
sp = ALLOC(shblock);
sp->nxtshblock = NULL;
sp->shbp = (fin ? copys(p) : p );
yylval.yshblock = sp;
zznextc = 0;
return SHELLINE;
}
static int
nextlin(void)
{
static char yytext[INMAX];
static char *yytextl = yytext+INMAX;
char *text, templin[INMAX];
char c;
char *p, *t;
char lastch, *lastchp;
extern char **linesptr;
int incom;
int kc;
again:
incom = NO;
zznextc = 0;
if(fin == NULL)
{
if( (text = *linesptr++) == 0)
return 0;
++yylineno;
}
else {
for(p = text = yytext ; p<yytextl ; *p++ = kc)
switch(kc = getc(fin))
{
case '\t':
if(p == yytext)
incom = YES;
break;
case ';':
incom = YES;
break;
case '#':
if(! incom)
kc = '\0';
break;
case '\n':
++yylineno;
if(p==yytext || p[-1]!='\\')
{
*p = '\0';
goto endloop;
}
p[-1] = ' ';
while( (kc=getc(fin))=='\t' || kc==' ' || kc=='\n')
if(kc == '\n')
++yylineno;
if(kc != EOF)
break;
case EOF:
*p = '\0';
if(ninclude > 1)
{
register struct fstack *stp;
fclose(fin);
--ninclude;
stp = filestack + ninclude;
fin = stp->fin;
yylineno = stp->lineno;
free(stp->fname);
goto again;
}
return 0;
}
fatal("line too long");
}
endloop:
if((c = text[0]) == '\t')
return retsh(text) ;
if(isalpha(c) || isdigit(c) || c==' ' || c=='.'|| c=='_')
for(p=text+1; *p!='\0'; )
if(*p == ':')
break;
else if(*p++ == '=')
{
eqsign(text);
return MACRODEF;
}
/* substitute for macros on dependency line up to the semicolon if any */
for(t = yytext ; *t!='\0' && *t!=';' ; ++t)
;
lastchp = t;
lastch = *t;
*t = '\0'; /* replace the semi with a null so subst will stop */
subst(yytext, templin); /* Substitute for macros on dependency lines */
if(lastch) /* copy the stuff after the semicolon */
{
*lastchp = lastch;
strcat(templin, lastchp);
}
strcpy(yytext, templin);
/* process include files after macro substitution */
if(strncmp(text, "include", 7) == 0) {
if (isinclude(text+7))
goto again;
}
for(p = zznextc = text ; *p ; ++p )
if(*p!=' ' && *p!='\t')
return START;
goto again;
}
static int
isinclude(char *s)
{
char *t;
struct fstack *p;
for(t=s; *t==' ' || *t=='\t' ; ++t)
;
if(t == s)
return NO;
for(s = t; *s!='\n' && *s!='#' && *s!='\0' ; ++s)
if(*s == ':')
return NO;
*s = '\0';
if(ninclude >= MAXINCLUDE)
fatal("include depth exceeded");
p = filestack + ninclude;
p->fin = fin;
p->lineno = yylineno;
p->fname = copys(t);
if( (fin = fopen(t, "r")) == NULL)
fatal1("Cannot open include file %s", t);
yylineno = 0;
++ninclude;
return YES;
}
int
yyerror(char *s, ...)
{
char buf[100];
sprintf(buf, "line %d of file %s: %s",
yylineno, filestack[ninclude-1].fname, s);
fatal(buf);
return -1;
}