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toke.c
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toke.c
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/* toke.c
*
* Copyright (c) 1991-1997, Larry Wall
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* "It all comes from here, the stench and the peril." --Frodo
*/
#include "EXTERN.h"
#include "perl.h"
static void check_uni _((void));
static void force_next _((I32 type));
static char *force_version _((char *start));
static char *force_word _((char *start, int token, int check_keyword, int allow_pack, int allow_tick));
static SV *q _((SV *sv));
static char *scan_const _((char *start));
static char *scan_formline _((char *s));
static char *scan_heredoc _((char *s));
static char *scan_ident _((char *s, char *send, char *dest, I32 ck_uni));
static char *scan_inputsymbol _((char *start));
static char *scan_pat _((char *start));
static char *scan_str _((char *start));
static char *scan_subst _((char *start));
static char *scan_trans _((char *start));
static char *scan_word _((char *s, char *dest, int allow_package, STRLEN *slp));
static char *skipspace _((char *s));
static void checkcomma _((char *s, char *name, char *what));
static void force_ident _((char *s, int kind));
static void incline _((char *s));
static int intuit_method _((char *s, GV *gv));
static int intuit_more _((char *s));
static I32 lop _((I32 f, expectation x, char *s));
static void missingterm _((char *s));
static void no_op _((char *what, char *s));
static void set_csh _((void));
static I32 sublex_done _((void));
static I32 sublex_push _((void));
static I32 sublex_start _((void));
#ifdef CRIPPLED_CC
static int uni _((I32 f, char *s));
#endif
static char * filter_gets _((SV *sv, PerlIO *fp, STRLEN append));
static void restore_rsfp _((void *f));
static char *linestart; /* beg. of most recently read line */
static char pending_ident; /* pending identifier lookup */
static struct {
I32 super_state; /* lexer state to save */
I32 sub_inwhat; /* "lex_inwhat" to use */
OP *sub_op; /* "lex_op" to use */
} sublex_info;
/* The following are arranged oddly so that the guard on the switch statement
* can get by with a single comparison (if the compiler is smart enough).
*/
#define LEX_NORMAL 10
#define LEX_INTERPNORMAL 9
#define LEX_INTERPCASEMOD 8
#define LEX_INTERPPUSH 7
#define LEX_INTERPSTART 6
#define LEX_INTERPEND 5
#define LEX_INTERPENDMAYBE 4
#define LEX_INTERPCONCAT 3
#define LEX_INTERPCONST 2
#define LEX_FORMLINE 1
#define LEX_KNOWNEXT 0
#ifdef I_FCNTL
#include <fcntl.h>
#endif
#ifdef I_SYS_FILE
#include <sys/file.h>
#endif
/* XXX If this causes problems, set i_unistd=undef in the hint file. */
#ifdef I_UNISTD
# include <unistd.h> /* Needed for execv() */
#endif
#ifdef ff_next
#undef ff_next
#endif
#include "keywords.h"
#ifdef CLINE
#undef CLINE
#endif
#define CLINE (copline = (curcop->cop_line < copline ? curcop->cop_line : copline))
#define TOKEN(retval) return (bufptr = s,(int)retval)
#define OPERATOR(retval) return (expect = XTERM,bufptr = s,(int)retval)
#define AOPERATOR(retval) return ao((expect = XTERM,bufptr = s,(int)retval))
#define PREBLOCK(retval) return (expect = XBLOCK,bufptr = s,(int)retval)
#define PRETERMBLOCK(retval) return (expect = XTERMBLOCK,bufptr = s,(int)retval)
#define PREREF(retval) return (expect = XREF,bufptr = s,(int)retval)
#define TERM(retval) return (CLINE, expect = XOPERATOR,bufptr = s,(int)retval)
#define LOOPX(f) return(yylval.ival=f,expect = XTERM,bufptr = s,(int)LOOPEX)
#define FTST(f) return(yylval.ival=f,expect = XTERM,bufptr = s,(int)UNIOP)
#define FUN0(f) return(yylval.ival = f,expect = XOPERATOR,bufptr = s,(int)FUNC0)
#define FUN1(f) return(yylval.ival = f,expect = XOPERATOR,bufptr = s,(int)FUNC1)
#define BOop(f) return ao((yylval.ival=f,expect = XTERM,bufptr = s,(int)BITOROP))
#define BAop(f) return ao((yylval.ival=f,expect = XTERM,bufptr = s,(int)BITANDOP))
#define SHop(f) return ao((yylval.ival=f,expect = XTERM,bufptr = s,(int)SHIFTOP))
#define PWop(f) return ao((yylval.ival=f,expect = XTERM,bufptr = s,(int)POWOP))
#define PMop(f) return(yylval.ival=f,expect = XTERM,bufptr = s,(int)MATCHOP)
#define Aop(f) return ao((yylval.ival=f,expect = XTERM,bufptr = s,(int)ADDOP))
#define Mop(f) return ao((yylval.ival=f,expect = XTERM,bufptr = s,(int)MULOP))
#define Eop(f) return(yylval.ival=f,expect = XTERM,bufptr = s,(int)EQOP)
#define Rop(f) return(yylval.ival=f,expect = XTERM,bufptr = s,(int)RELOP)
/* This bit of chicanery makes a unary function followed by
* a parenthesis into a function with one argument, highest precedence.
*/
#define UNI(f) return(yylval.ival = f, \
expect = XTERM, \
bufptr = s, \
last_uni = oldbufptr, \
last_lop_op = f, \
(*s == '(' || (s = skipspace(s), *s == '(') ? (int)FUNC1 : (int)UNIOP) )
#define UNIBRACK(f) return(yylval.ival = f, \
bufptr = s, \
last_uni = oldbufptr, \
(*s == '(' || (s = skipspace(s), *s == '(') ? (int)FUNC1 : (int)UNIOP) )
/* grandfather return to old style */
#define OLDLOP(f) return(yylval.ival=f,expect = XTERM,bufptr = s,(int)LSTOP)
static int
ao(toketype)
int toketype;
{
if (*bufptr == '=') {
bufptr++;
if (toketype == ANDAND)
yylval.ival = OP_ANDASSIGN;
else if (toketype == OROR)
yylval.ival = OP_ORASSIGN;
toketype = ASSIGNOP;
}
return toketype;
}
static void
no_op(what, s)
char *what;
char *s;
{
char *oldbp = bufptr;
bool is_first = (oldbufptr == linestart);
char *msg;
bufptr = s;
New(890, msg, strlen(what) + 40, char);
sprintf(msg, "%s found where operator expected", what);
yywarn(msg);
Safefree(msg);
if (is_first)
warn("\t(Missing semicolon on previous line?)\n");
else if (oldoldbufptr && isIDFIRST(*oldoldbufptr)) {
char *t;
for (t = oldoldbufptr; *t && (isALNUM(*t) || *t == ':'); t++) ;
if (t < bufptr && isSPACE(*t))
warn("\t(Do you need to predeclare %.*s?)\n",
t - oldoldbufptr, oldoldbufptr);
}
else
warn("\t(Missing operator before %.*s?)\n", s - oldbp, oldbp);
bufptr = oldbp;
}
static void
missingterm(s)
char *s;
{
char tmpbuf[3];
char q;
if (s) {
char *nl = strrchr(s,'\n');
if (nl)
*nl = '\0';
}
else if (multi_close < 32 || multi_close == 127) {
*tmpbuf = '^';
tmpbuf[1] = toCTRL(multi_close);
s = "\\n";
tmpbuf[2] = '\0';
s = tmpbuf;
}
else {
*tmpbuf = multi_close;
tmpbuf[1] = '\0';
s = tmpbuf;
}
q = strchr(s,'"') ? '\'' : '"';
croak("Can't find string terminator %c%s%c anywhere before EOF",q,s,q);
}
void
deprecate(s)
char *s;
{
if (dowarn)
warn("Use of %s is deprecated", s);
}
static void
depcom()
{
deprecate("comma-less variable list");
}
void
lex_start(line)
SV *line;
{
char *s;
STRLEN len;
SAVEI32(lex_dojoin);
SAVEI32(lex_brackets);
SAVEI32(lex_fakebrack);
SAVEI32(lex_casemods);
SAVEI32(lex_starts);
SAVEI32(lex_state);
SAVESPTR(lex_inpat);
SAVEI32(lex_inwhat);
SAVEI16(curcop->cop_line);
SAVEPPTR(bufptr);
SAVEPPTR(bufend);
SAVEPPTR(oldbufptr);
SAVEPPTR(oldoldbufptr);
SAVEPPTR(linestart);
SAVESPTR(linestr);
SAVEPPTR(lex_brackstack);
SAVEPPTR(lex_casestack);
SAVEDESTRUCTOR(restore_rsfp, rsfp);
lex_state = LEX_NORMAL;
lex_defer = 0;
expect = XSTATE;
lex_brackets = 0;
lex_fakebrack = 0;
New(899, lex_brackstack, 120, char);
New(899, lex_casestack, 12, char);
SAVEFREEPV(lex_brackstack);
SAVEFREEPV(lex_casestack);
lex_casemods = 0;
*lex_casestack = '\0';
lex_dojoin = 0;
lex_starts = 0;
if (lex_stuff)
SvREFCNT_dec(lex_stuff);
lex_stuff = Nullsv;
if (lex_repl)
SvREFCNT_dec(lex_repl);
lex_repl = Nullsv;
lex_inpat = 0;
lex_inwhat = 0;
linestr = line;
if (SvREADONLY(linestr))
linestr = sv_2mortal(newSVsv(linestr));
s = SvPV(linestr, len);
if (len && s[len-1] != ';') {
if (!(SvFLAGS(linestr) & SVs_TEMP))
linestr = sv_2mortal(newSVsv(linestr));
sv_catpvn(linestr, "\n;", 2);
}
SvTEMP_off(linestr);
oldoldbufptr = oldbufptr = bufptr = linestart = SvPVX(linestr);
bufend = bufptr + SvCUR(linestr);
SvREFCNT_dec(rs);
rs = newSVpv("\n", 1);
rsfp = 0;
}
void
lex_end()
{
doextract = FALSE;
}
static void
restore_rsfp(f)
void *f;
{
PerlIO *fp = (PerlIO*)f;
if (rsfp == PerlIO_stdin())
PerlIO_clearerr(rsfp);
else if (rsfp && (rsfp != fp))
PerlIO_close(rsfp);
rsfp = fp;
}
static void
incline(s)
char *s;
{
char *t;
char *n;
char ch;
int sawline = 0;
curcop->cop_line++;
if (*s++ != '#')
return;
while (*s == ' ' || *s == '\t') s++;
if (strnEQ(s, "line ", 5)) {
s += 5;
sawline = 1;
}
if (!isDIGIT(*s))
return;
n = s;
while (isDIGIT(*s))
s++;
while (*s == ' ' || *s == '\t')
s++;
if (*s == '"' && (t = strchr(s+1, '"')))
s++;
else {
if (!sawline)
return; /* false alarm */
for (t = s; !isSPACE(*t); t++) ;
}
ch = *t;
*t = '\0';
if (t - s > 0)
curcop->cop_filegv = gv_fetchfile(s);
else
curcop->cop_filegv = gv_fetchfile(origfilename);
*t = ch;
curcop->cop_line = atoi(n)-1;
}
static char *
skipspace(s)
register char *s;
{
if (lex_formbrack && lex_brackets <= lex_formbrack) {
while (s < bufend && (*s == ' ' || *s == '\t'))
s++;
return s;
}
for (;;) {
STRLEN prevlen;
while (s < bufend && isSPACE(*s))
s++;
if (s < bufend && *s == '#') {
while (s < bufend && *s != '\n')
s++;
if (s < bufend)
s++;
}
if (s < bufend || !rsfp || lex_state != LEX_NORMAL)
return s;
if ((s = filter_gets(linestr, rsfp, (prevlen = SvCUR(linestr)))) == Nullch) {
if (minus_n || minus_p) {
sv_setpv(linestr,minus_p ? ";}continue{print" : "");
sv_catpv(linestr,";}");
minus_n = minus_p = 0;
}
else
sv_setpv(linestr,";");
oldoldbufptr = oldbufptr = bufptr = s = linestart = SvPVX(linestr);
bufend = SvPVX(linestr) + SvCUR(linestr);
if (preprocess && !in_eval)
(void)my_pclose(rsfp);
else if ((PerlIO*)rsfp == PerlIO_stdin())
PerlIO_clearerr(rsfp);
else
(void)PerlIO_close(rsfp);
rsfp = Nullfp;
return s;
}
linestart = bufptr = s + prevlen;
bufend = s + SvCUR(linestr);
s = bufptr;
incline(s);
if (perldb && curstash != debstash) {
SV *sv = NEWSV(85,0);
sv_upgrade(sv, SVt_PVMG);
sv_setpvn(sv,bufptr,bufend-bufptr);
av_store(GvAV(curcop->cop_filegv),(I32)curcop->cop_line,sv);
}
}
}
static void
check_uni() {
char *s;
char ch;
char *t;
if (oldoldbufptr != last_uni)
return;
while (isSPACE(*last_uni))
last_uni++;
for (s = last_uni; isALNUM(*s) || *s == '-'; s++) ;
if ((t = strchr(s, '(')) && t < bufptr)
return;
ch = *s;
*s = '\0';
warn("Warning: Use of \"%s\" without parens is ambiguous", last_uni);
*s = ch;
}
#ifdef CRIPPLED_CC
#undef UNI
#define UNI(f) return uni(f,s)
static int
uni(f,s)
I32 f;
char *s;
{
yylval.ival = f;
expect = XTERM;
bufptr = s;
last_uni = oldbufptr;
last_lop_op = f;
if (*s == '(')
return FUNC1;
s = skipspace(s);
if (*s == '(')
return FUNC1;
else
return UNIOP;
}
#endif /* CRIPPLED_CC */
#define LOP(f,x) return lop(f,x,s)
static I32
lop
#ifdef CAN_PROTOTYPE
(I32 f, expectation x, char *s)
#else
(f,x,s)
I32 f;
expectation x;
char *s;
#endif /* CAN_PROTOTYPE */
{
yylval.ival = f;
CLINE;
expect = x;
bufptr = s;
last_lop = oldbufptr;
last_lop_op = f;
if (nexttoke)
return LSTOP;
if (*s == '(')
return FUNC;
s = skipspace(s);
if (*s == '(')
return FUNC;
else
return LSTOP;
}
static void
force_next(type)
I32 type;
{
nexttype[nexttoke] = type;
nexttoke++;
if (lex_state != LEX_KNOWNEXT) {
lex_defer = lex_state;
lex_expect = expect;
lex_state = LEX_KNOWNEXT;
}
}
static char *
force_word(start,token,check_keyword,allow_pack,allow_tick)
register char *start;
int token;
int check_keyword;
int allow_pack;
int allow_tick;
{
register char *s;
STRLEN len;
start = skipspace(start);
s = start;
if (isIDFIRST(*s) ||
(allow_pack && *s == ':') ||
(allow_tick && *s == '\'') )
{
s = scan_word(s, tokenbuf, allow_pack, &len);
if (check_keyword && keyword(tokenbuf, len))
return start;
if (token == METHOD) {
s = skipspace(s);
if (*s == '(')
expect = XTERM;
else {
expect = XOPERATOR;
force_next(')');
force_next('(');
}
}
nextval[nexttoke].opval = (OP*)newSVOP(OP_CONST,0, newSVpv(tokenbuf,0));
nextval[nexttoke].opval->op_private |= OPpCONST_BARE;
force_next(token);
}
return s;
}
static void
force_ident(s, kind)
register char *s;
int kind;
{
if (s && *s) {
OP* op = (OP*)newSVOP(OP_CONST, 0, newSVpv(s,0));
nextval[nexttoke].opval = op;
force_next(WORD);
if (kind) {
op->op_private = OPpCONST_ENTERED;
/* XXX see note in pp_entereval() for why we forgo typo
warnings if the symbol must be introduced in an eval.
GSAR 96-10-12 */
gv_fetchpv(s, in_eval ? GV_ADDMULTI : TRUE,
kind == '$' ? SVt_PV :
kind == '@' ? SVt_PVAV :
kind == '%' ? SVt_PVHV :
SVt_PVGV
);
}
}
}
static char *
force_version(s)
char *s;
{
OP *version = Nullop;
s = skipspace(s);
/* default VERSION number -- GBARR */
if(isDIGIT(*s)) {
char *d;
int c;
for( d=s, c = 1; isDIGIT(*d) || *d == '_' || (*d == '.' && c--); d++);
if((*d == ';' || isSPACE(*d)) && *(skipspace(d)) != ',') {
s = scan_num(s);
/* real VERSION number -- GBARR */
version = yylval.opval;
}
}
/* NOTE: The parser sees the package name and the VERSION swapped */
nextval[nexttoke].opval = version;
force_next(WORD);
return (s);
}
static SV *
q(sv)
SV *sv;
{
register char *s;
register char *send;
register char *d;
STRLEN len;
if (!SvLEN(sv))
return sv;
s = SvPV_force(sv, len);
if (SvIVX(sv) == -1)
return sv;
send = s + len;
while (s < send && *s != '\\')
s++;
if (s == send)
return sv;
d = s;
while (s < send) {
if (*s == '\\') {
if (s + 1 < send && (s[1] == '\\'))
s++; /* all that, just for this */
}
*d++ = *s++;
}
*d = '\0';
SvCUR_set(sv, d - SvPVX(sv));
return sv;
}
static I32
sublex_start()
{
register I32 op_type = yylval.ival;
if (op_type == OP_NULL) {
yylval.opval = lex_op;
lex_op = Nullop;
return THING;
}
if (op_type == OP_CONST || op_type == OP_READLINE) {
SV *sv = q(lex_stuff);
STRLEN len;
char *p = SvPV(sv, len);
yylval.opval = (OP*)newSVOP(op_type, 0, newSVpv(p, len));
SvREFCNT_dec(sv);
lex_stuff = Nullsv;
return THING;
}
sublex_info.super_state = lex_state;
sublex_info.sub_inwhat = op_type;
sublex_info.sub_op = lex_op;
lex_state = LEX_INTERPPUSH;
expect = XTERM;
if (lex_op) {
yylval.opval = lex_op;
lex_op = Nullop;
return PMFUNC;
}
else
return FUNC;
}
static I32
sublex_push()
{
push_scope();
lex_state = sublex_info.super_state;
SAVEI32(lex_dojoin);
SAVEI32(lex_brackets);
SAVEI32(lex_fakebrack);
SAVEI32(lex_casemods);
SAVEI32(lex_starts);
SAVEI32(lex_state);
SAVESPTR(lex_inpat);
SAVEI32(lex_inwhat);
SAVEI16(curcop->cop_line);
SAVEPPTR(bufptr);
SAVEPPTR(oldbufptr);
SAVEPPTR(oldoldbufptr);
SAVEPPTR(linestart);
SAVESPTR(linestr);
SAVEPPTR(lex_brackstack);
SAVEPPTR(lex_casestack);
linestr = lex_stuff;
lex_stuff = Nullsv;
bufend = bufptr = oldbufptr = oldoldbufptr = linestart = SvPVX(linestr);
bufend += SvCUR(linestr);
SAVEFREESV(linestr);
lex_dojoin = FALSE;
lex_brackets = 0;
lex_fakebrack = 0;
New(899, lex_brackstack, 120, char);
New(899, lex_casestack, 12, char);
SAVEFREEPV(lex_brackstack);
SAVEFREEPV(lex_casestack);
lex_casemods = 0;
*lex_casestack = '\0';
lex_starts = 0;
lex_state = LEX_INTERPCONCAT;
curcop->cop_line = multi_start;
lex_inwhat = sublex_info.sub_inwhat;
if (lex_inwhat == OP_MATCH || lex_inwhat == OP_SUBST)
lex_inpat = sublex_info.sub_op;
else
lex_inpat = Nullop;
return '(';
}
static I32
sublex_done()
{
if (!lex_starts++) {
expect = XOPERATOR;
yylval.opval = (OP*)newSVOP(OP_CONST, 0, newSVpv("",0));
return THING;
}
if (lex_casemods) { /* oops, we've got some unbalanced parens */
lex_state = LEX_INTERPCASEMOD;
return yylex();
}
/* Is there a right-hand side to take care of? */
if (lex_repl && (lex_inwhat == OP_SUBST || lex_inwhat == OP_TRANS)) {
linestr = lex_repl;
lex_inpat = 0;
bufend = bufptr = oldbufptr = oldoldbufptr = linestart = SvPVX(linestr);
bufend += SvCUR(linestr);
SAVEFREESV(linestr);
lex_dojoin = FALSE;
lex_brackets = 0;
lex_fakebrack = 0;
lex_casemods = 0;
*lex_casestack = '\0';
lex_starts = 0;
if (SvCOMPILED(lex_repl)) {
lex_state = LEX_INTERPNORMAL;
lex_starts++;
}
else
lex_state = LEX_INTERPCONCAT;
lex_repl = Nullsv;
return ',';
}
else {
pop_scope();
bufend = SvPVX(linestr);
bufend += SvCUR(linestr);
expect = XOPERATOR;
return ')';
}
}
static char *
scan_const(start)
char *start;
{
register char *send = bufend;
SV *sv = NEWSV(93, send - start);
register char *s = start;
register char *d = SvPVX(sv);
bool dorange = FALSE;
I32 len;
char *leave =
lex_inpat
? "\\.^$@AGZdDwWsSbB+*?|()-nrtfeaxc0123456789[{]} \t\n\r\f\v#"
: (lex_inwhat & OP_TRANS)
? ""
: "";
while (s < send || dorange) {
if (lex_inwhat == OP_TRANS) {
if (dorange) {
I32 i;
I32 max;
i = d - SvPVX(sv);
SvGROW(sv, SvLEN(sv) + 256);
d = SvPVX(sv) + i;
d -= 2;
max = (U8)d[1];
for (i = (U8)*d; i <= max; i++)
*d++ = i;
dorange = FALSE;
continue;
}
else if (*s == '-' && s+1 < send && s != start) {
dorange = TRUE;
s++;
}
}
else if (*s == '(' && lex_inpat && s[1] == '?' && s[2] == '#') {
while (s < send && *s != ')')
*d++ = *s++;
}
else if (*s == '#' && lex_inpat &&
((PMOP*)lex_inpat)->op_pmflags & PMf_EXTENDED) {
while (s+1 < send && *s != '\n')
*d++ = *s++;
}
else if (*s == '@' && s[1] && (isALNUM(s[1]) || strchr(":'{$", s[1])))
break;
else if (*s == '$') {
if (!lex_inpat) /* not a regexp, so $ must be var */
break;
if (s + 1 < send && !strchr(")| \n\t", s[1]))
break; /* in regexp, $ might be tail anchor */
}
if (*s == '\\' && s+1 < send) {
s++;
if (*s && strchr(leave, *s)) {
*d++ = '\\';
*d++ = *s++;
continue;
}
if (lex_inwhat == OP_SUBST && !lex_inpat &&
isDIGIT(*s) && *s != '0' && !isDIGIT(s[1]))
{
if (dowarn)
warn("\\%c better written as $%c", *s, *s);
*--s = '$';
break;
}
if (lex_inwhat != OP_TRANS && *s && strchr("lLuUEQ", *s)) {
--s;
break;
}
switch (*s) {
case '-':
if (lex_inwhat == OP_TRANS) {
*d++ = *s++;
continue;
}
/* FALL THROUGH */
default:
*d++ = *s++;
continue;
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
*d++ = scan_oct(s, 3, &len);
s += len;
continue;
case 'x':
*d++ = scan_hex(++s, 2, &len);
s += len;
continue;
case 'c':
s++;
len = *s++;
*d++ = toCTRL(len);
continue;
case 'b':
*d++ = '\b';
break;
case 'n':
*d++ = '\n';
break;
case 'r':
*d++ = '\r';
break;
case 'f':
*d++ = '\f';
break;
case 't':
*d++ = '\t';
break;
case 'e':
*d++ = '\033';
break;
case 'a':
*d++ = '\007';
break;
}
s++;
continue;
}
*d++ = *s++;
}
*d = '\0';
SvCUR_set(sv, d - SvPVX(sv));
SvPOK_on(sv);
if (SvCUR(sv) + 5 < SvLEN(sv)) {
SvLEN_set(sv, SvCUR(sv) + 1);
Renew(SvPVX(sv), SvLEN(sv), char);
}
if (s > bufptr)
yylval.opval = (OP*)newSVOP(OP_CONST, 0, sv);
else
SvREFCNT_dec(sv);
return s;
}
/* This is the one truly awful dwimmer necessary to conflate C and sed. */
static int
intuit_more(s)
register char *s;
{
if (lex_brackets)
return TRUE;
if (*s == '-' && s[1] == '>' && (s[2] == '[' || s[2] == '{'))
return TRUE;
if (*s != '{' && *s != '[')
return FALSE;
if (!lex_inpat)
return TRUE;
/* In a pattern, so maybe we have {n,m}. */
if (*s == '{') {
s++;
if (!isDIGIT(*s))
return TRUE;
while (isDIGIT(*s))
s++;
if (*s == ',')
s++;
while (isDIGIT(*s))
s++;
if (*s == '}')
return FALSE;
return TRUE;
}
/* On the other hand, maybe we have a character class */
s++;
if (*s == ']' || *s == '^')
return FALSE;
else {
int weight = 2; /* let's weigh the evidence */
char seen[256];
unsigned char un_char = 0, last_un_char;
char *send = strchr(s,']');
char tmpbuf[512];
if (!send) /* has to be an expression */
return TRUE;
Zero(seen,256,char);
if (*s == '$')
weight -= 3;
else if (isDIGIT(*s)) {
if (s[1] != ']') {
if (isDIGIT(s[1]) && s[2] == ']')
weight -= 10;
}
else
weight -= 100;
}
for (; s < send; s++) {
last_un_char = un_char;
un_char = (unsigned char)*s;
switch (*s) {
case '@':
case '&':
case '$':
weight -= seen[un_char] * 10;
if (isALNUM(s[1])) {
scan_ident(s,send,tmpbuf,FALSE);
if ((int)strlen(tmpbuf) > 1 && gv_fetchpv(tmpbuf,FALSE, SVt_PV))
weight -= 100;
else
weight -= 10;
}
else if (*s == '$' && s[1] &&
strchr("[#!%*<>()-=",s[1])) {
if (/*{*/ strchr("])} =",s[2]))
weight -= 10;
else
weight -= 1;
}
break;
case '\\':
un_char = 254;
if (s[1]) {
if (strchr("wds]",s[1]))
weight += 100;
else if (seen['\''] || seen['"'])
weight += 1;
else if (strchr("rnftbxcav",s[1]))
weight += 40;
else if (isDIGIT(s[1])) {
weight += 40;
while (s[1] && isDIGIT(s[1]))
s++;
}
}
else
weight += 100;
break;
case '-':
if (s[1] == '\\')
weight += 50;
if (strchr("aA01! ",last_un_char))
weight += 30;
if (strchr("zZ79~",s[1]))
weight += 30;
break;
default:
if (!isALNUM(last_un_char) && !strchr("$@&",last_un_char) &&
isALPHA(*s) && s[1] && isALPHA(s[1])) {
char *d = tmpbuf;
while (isALPHA(*s))
*d++ = *s++;
*d = '\0';
if (keyword(tmpbuf, d - tmpbuf))
weight -= 150;
}