forked from Perl/perl5
/
toke.c
7917 lines (7175 loc) · 199 KB
/
toke.c
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/* toke.c
*
* Copyright (c) 1991-2003, 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
*/
/*
* This file is the lexer for Perl. It's closely linked to the
* parser, perly.y.
*
* The main routine is yylex(), which returns the next token.
*/
#include "EXTERN.h"
#define PERL_IN_TOKE_C
#include "perl.h"
#define yychar PL_yychar
#define yylval PL_yylval
static char ident_too_long[] = "Identifier too long";
static char c_without_g[] = "Use of /c modifier is meaningless without /g";
static char c_in_subst[] = "Use of /c modifier is meaningless in s///";
static void restore_rsfp(pTHX_ void *f);
#ifndef PERL_NO_UTF16_FILTER
static I32 utf16_textfilter(pTHX_ int idx, SV *sv, int maxlen);
static I32 utf16rev_textfilter(pTHX_ int idx, SV *sv, int maxlen);
#endif
#define XFAKEBRACK 128
#define XENUMMASK 127
#ifdef USE_UTF8_SCRIPTS
# define UTF (!IN_BYTES)
#else
# define UTF ((PL_linestr && DO_UTF8(PL_linestr)) || (PL_hints & HINT_UTF8))
#endif
/* In variables named $^X, these are the legal values for X.
* 1999-02-27 mjd-perl-patch@plover.com */
#define isCONTROLVAR(x) (isUPPER(x) || strchr("[\\]^_?", (x)))
/* On MacOS, respect nonbreaking spaces */
#ifdef MACOS_TRADITIONAL
#define SPACE_OR_TAB(c) ((c)==' '||(c)=='\312'||(c)=='\t')
#else
#define SPACE_OR_TAB(c) ((c)==' '||(c)=='\t')
#endif
/* LEX_* are values for PL_lex_state, the state of the lexer.
* They 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_NOTPARSING 11 is done in perl.h. */
#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 ff_next
#undef ff_next
#endif
#ifdef USE_PURE_BISON
# ifndef YYMAXLEVEL
# define YYMAXLEVEL 100
# endif
YYSTYPE* yylval_pointer[YYMAXLEVEL];
int* yychar_pointer[YYMAXLEVEL];
int yyactlevel = -1;
# undef yylval
# undef yychar
# define yylval (*yylval_pointer[yyactlevel])
# define yychar (*yychar_pointer[yyactlevel])
# define PERL_YYLEX_PARAM yylval_pointer[yyactlevel],yychar_pointer[yyactlevel]
# undef yylex
# define yylex() Perl_yylex_r(aTHX_ yylval_pointer[yyactlevel],yychar_pointer[yyactlevel])
#endif
#include "keywords.h"
/* CLINE is a macro that ensures PL_copline has a sane value */
#ifdef CLINE
#undef CLINE
#endif
#define CLINE (PL_copline = (CopLINE(PL_curcop) < PL_copline ? CopLINE(PL_curcop) : PL_copline))
/*
* Convenience functions to return different tokens and prime the
* lexer for the next token. They all take an argument.
*
* TOKEN : generic token (used for '(', DOLSHARP, etc)
* OPERATOR : generic operator
* AOPERATOR : assignment operator
* PREBLOCK : beginning the block after an if, while, foreach, ...
* PRETERMBLOCK : beginning a non-code-defining {} block (eg, hash ref)
* PREREF : *EXPR where EXPR is not a simple identifier
* TERM : expression term
* LOOPX : loop exiting command (goto, last, dump, etc)
* FTST : file test operator
* FUN0 : zero-argument function
* FUN1 : not used, except for not, which isn't a UNIOP
* BOop : bitwise or or xor
* BAop : bitwise and
* SHop : shift operator
* PWop : power operator
* PMop : pattern-matching operator
* Aop : addition-level operator
* Mop : multiplication-level operator
* Eop : equality-testing operator
* Rop : relational operator <= != gt
*
* Also see LOP and lop() below.
*/
/* Note that REPORT() and REPORT2() will be expressions that supply
* their own trailing comma, not suitable for statements as such. */
#ifdef DEBUGGING /* Serve -DT. */
# define REPORT(x,retval) tokereport(x,s,(int)retval),
# define REPORT2(x,retval) tokereport(x,s, yylval.ival),
#else
# define REPORT(x,retval)
# define REPORT2(x,retval)
#endif
#define TOKEN(retval) return (REPORT2("token",retval) PL_bufptr = s,(int)retval)
#define OPERATOR(retval) return (REPORT2("operator",retval) PL_expect = XTERM, PL_bufptr = s,(int)retval)
#define AOPERATOR(retval) return ao((REPORT2("aop",retval) PL_expect = XTERM, PL_bufptr = s,(int)retval))
#define PREBLOCK(retval) return (REPORT2("preblock",retval) PL_expect = XBLOCK,PL_bufptr = s,(int)retval)
#define PRETERMBLOCK(retval) return (REPORT2("pretermblock",retval) PL_expect = XTERMBLOCK,PL_bufptr = s,(int)retval)
#define PREREF(retval) return (REPORT2("preref",retval) PL_expect = XREF,PL_bufptr = s,(int)retval)
#define TERM(retval) return (CLINE, REPORT2("term",retval) PL_expect = XOPERATOR, PL_bufptr = s,(int)retval)
#define LOOPX(f) return(yylval.ival=f, REPORT("loopx",f) PL_expect = XTERM,PL_bufptr = s,(int)LOOPEX)
#define FTST(f) return(yylval.ival=f, REPORT("ftst",f) PL_expect = XTERMORDORDOR,PL_bufptr = s,(int)UNIOP)
#define FUN0(f) return(yylval.ival = f, REPORT("fun0",f) PL_expect = XOPERATOR,PL_bufptr = s,(int)FUNC0)
#define FUN1(f) return(yylval.ival = f, REPORT("fun1",f) PL_expect = XOPERATOR,PL_bufptr = s,(int)FUNC1)
#define BOop(f) return ao((yylval.ival=f, REPORT("bitorop",f) PL_expect = XTERM,PL_bufptr = s,(int)BITOROP))
#define BAop(f) return ao((yylval.ival=f, REPORT("bitandop",f) PL_expect = XTERM,PL_bufptr = s,(int)BITANDOP))
#define SHop(f) return ao((yylval.ival=f, REPORT("shiftop",f) PL_expect = XTERM,PL_bufptr = s,(int)SHIFTOP))
#define PWop(f) return ao((yylval.ival=f, REPORT("powop",f) PL_expect = XTERM,PL_bufptr = s,(int)POWOP))
#define PMop(f) return(yylval.ival=f, REPORT("matchop",f) PL_expect = XTERM,PL_bufptr = s,(int)MATCHOP)
#define Aop(f) return ao((yylval.ival=f, REPORT("add",f) PL_expect = XTERM,PL_bufptr = s,(int)ADDOP))
#define Mop(f) return ao((yylval.ival=f, REPORT("mul",f) PL_expect = XTERM,PL_bufptr = s,(int)MULOP))
#define Eop(f) return(yylval.ival=f, REPORT("eq",f) PL_expect = XTERM,PL_bufptr = s,(int)EQOP)
#define Rop(f) return(yylval.ival=f, REPORT("rel",f) PL_expect = XTERM,PL_bufptr = s,(int)RELOP)
/* This bit of chicanery makes a unary function followed by
* a parenthesis into a function with one argument, highest precedence.
* The UNIDOR macro is for unary functions that can be followed by the //
* operator (such as C<shift // 0>).
*/
#define UNI2(f,x) return(yylval.ival = f, \
REPORT("uni",f) \
PL_expect = x, \
PL_bufptr = s, \
PL_last_uni = PL_oldbufptr, \
PL_last_lop_op = f, \
(*s == '(' || (s = skipspace(s), *s == '(') ? (int)FUNC1 : (int)UNIOP) )
#define UNI(f) UNI2(f,XTERM)
#define UNIDOR(f) UNI2(f,XTERMORDORDOR)
#define UNIBRACK(f) return(yylval.ival = f, \
REPORT("uni",f) \
PL_bufptr = s, \
PL_last_uni = PL_oldbufptr, \
(*s == '(' || (s = skipspace(s), *s == '(') ? (int)FUNC1 : (int)UNIOP) )
/* grandfather return to old style */
#define OLDLOP(f) return(yylval.ival=f,PL_expect = XTERM,PL_bufptr = s,(int)LSTOP)
#ifdef DEBUGGING
STATIC void
S_tokereport(pTHX_ char *thing, char* s, I32 rv)
{
DEBUG_T({
SV* report = newSVpv(thing, 0);
Perl_sv_catpvf(aTHX_ report, ":line %d:%"IVdf":", CopLINE(PL_curcop),
(IV)rv);
if (s - PL_bufptr > 0)
sv_catpvn(report, PL_bufptr, s - PL_bufptr);
else {
if (PL_oldbufptr && *PL_oldbufptr)
sv_catpv(report, PL_tokenbuf);
}
PerlIO_printf(Perl_debug_log, "### %s\n", SvPV_nolen(report));
});
}
#endif
/*
* S_ao
*
* This subroutine detects &&=, ||=, and //= and turns an ANDAND, OROR or DORDOR
* into an OP_ANDASSIGN, OP_ORASSIGN, or OP_DORASSIGN
*/
STATIC int
S_ao(pTHX_ int toketype)
{
if (*PL_bufptr == '=') {
PL_bufptr++;
if (toketype == ANDAND)
yylval.ival = OP_ANDASSIGN;
else if (toketype == OROR)
yylval.ival = OP_ORASSIGN;
else if (toketype == DORDOR)
yylval.ival = OP_DORASSIGN;
toketype = ASSIGNOP;
}
return toketype;
}
/*
* S_no_op
* When Perl expects an operator and finds something else, no_op
* prints the warning. It always prints "<something> found where
* operator expected. It prints "Missing semicolon on previous line?"
* if the surprise occurs at the start of the line. "do you need to
* predeclare ..." is printed out for code like "sub bar; foo bar $x"
* where the compiler doesn't know if foo is a method call or a function.
* It prints "Missing operator before end of line" if there's nothing
* after the missing operator, or "... before <...>" if there is something
* after the missing operator.
*/
STATIC void
S_no_op(pTHX_ char *what, char *s)
{
char *oldbp = PL_bufptr;
bool is_first = (PL_oldbufptr == PL_linestart);
if (!s)
s = oldbp;
else
PL_bufptr = s;
yywarn(Perl_form(aTHX_ "%s found where operator expected", what));
if (is_first)
Perl_warn(aTHX_ "\t(Missing semicolon on previous line?)\n");
else if (PL_oldoldbufptr && isIDFIRST_lazy_if(PL_oldoldbufptr,UTF)) {
char *t;
for (t = PL_oldoldbufptr; *t && (isALNUM_lazy_if(t,UTF) || *t == ':'); t++) ;
if (t < PL_bufptr && isSPACE(*t))
Perl_warn(aTHX_ "\t(Do you need to predeclare %.*s?)\n",
t - PL_oldoldbufptr, PL_oldoldbufptr);
}
else {
assert(s >= oldbp);
Perl_warn(aTHX_ "\t(Missing operator before %.*s?)\n", s - oldbp, oldbp);
}
PL_bufptr = oldbp;
}
/*
* S_missingterm
* Complain about missing quote/regexp/heredoc terminator.
* If it's called with (char *)NULL then it cauterizes the line buffer.
* If we're in a delimited string and the delimiter is a control
* character, it's reformatted into a two-char sequence like ^C.
* This is fatal.
*/
STATIC void
S_missingterm(pTHX_ char *s)
{
char tmpbuf[3];
char q;
if (s) {
char *nl = strrchr(s,'\n');
if (nl)
*nl = '\0';
}
else if (
#ifdef EBCDIC
iscntrl(PL_multi_close)
#else
PL_multi_close < 32 || PL_multi_close == 127
#endif
) {
*tmpbuf = '^';
tmpbuf[1] = toCTRL(PL_multi_close);
s = "\\n";
tmpbuf[2] = '\0';
s = tmpbuf;
}
else {
*tmpbuf = (char)PL_multi_close;
tmpbuf[1] = '\0';
s = tmpbuf;
}
q = strchr(s,'"') ? '\'' : '"';
Perl_croak(aTHX_ "Can't find string terminator %c%s%c anywhere before EOF",q,s,q);
}
/*
* Perl_deprecate
*/
void
Perl_deprecate(pTHX_ char *s)
{
if (ckWARN(WARN_DEPRECATED))
Perl_warner(aTHX_ packWARN(WARN_DEPRECATED), "Use of %s is deprecated", s);
}
void
Perl_deprecate_old(pTHX_ char *s)
{
/* This function should NOT be called for any new deprecated warnings */
/* Use Perl_deprecate instead */
/* */
/* It is here to maintain backward compatibility with the pre-5.8 */
/* warnings category hierarchy. The "deprecated" category used to */
/* live under the "syntax" category. It is now a top-level category */
/* in its own right. */
if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
"Use of %s is deprecated", s);
}
/*
* depcom
* Deprecate a comma-less variable list.
*/
STATIC void
S_depcom(pTHX)
{
deprecate_old("comma-less variable list");
}
/*
* experimental text filters for win32 carriage-returns, utf16-to-utf8 and
* utf16-to-utf8-reversed.
*/
#ifdef PERL_CR_FILTER
static void
strip_return(SV *sv)
{
register char *s = SvPVX(sv);
register char *e = s + SvCUR(sv);
/* outer loop optimized to do nothing if there are no CR-LFs */
while (s < e) {
if (*s++ == '\r' && *s == '\n') {
/* hit a CR-LF, need to copy the rest */
register char *d = s - 1;
*d++ = *s++;
while (s < e) {
if (*s == '\r' && s[1] == '\n')
s++;
*d++ = *s++;
}
SvCUR(sv) -= s - d;
return;
}
}
}
STATIC I32
S_cr_textfilter(pTHX_ int idx, SV *sv, int maxlen)
{
I32 count = FILTER_READ(idx+1, sv, maxlen);
if (count > 0 && !maxlen)
strip_return(sv);
return count;
}
#endif
/*
* Perl_lex_start
* Initialize variables. Uses the Perl save_stack to save its state (for
* recursive calls to the parser).
*/
void
Perl_lex_start(pTHX_ SV *line)
{
char *s;
STRLEN len;
SAVEI32(PL_lex_dojoin);
SAVEI32(PL_lex_brackets);
SAVEI32(PL_lex_casemods);
SAVEI32(PL_lex_starts);
SAVEI32(PL_lex_state);
SAVEVPTR(PL_lex_inpat);
SAVEI32(PL_lex_inwhat);
if (PL_lex_state == LEX_KNOWNEXT) {
I32 toke = PL_nexttoke;
while (--toke >= 0) {
SAVEI32(PL_nexttype[toke]);
SAVEVPTR(PL_nextval[toke]);
}
SAVEI32(PL_nexttoke);
}
SAVECOPLINE(PL_curcop);
SAVEPPTR(PL_bufptr);
SAVEPPTR(PL_bufend);
SAVEPPTR(PL_oldbufptr);
SAVEPPTR(PL_oldoldbufptr);
SAVEPPTR(PL_last_lop);
SAVEPPTR(PL_last_uni);
SAVEPPTR(PL_linestart);
SAVESPTR(PL_linestr);
SAVEGENERICPV(PL_lex_brackstack);
SAVEGENERICPV(PL_lex_casestack);
SAVEDESTRUCTOR_X(restore_rsfp, PL_rsfp);
SAVESPTR(PL_lex_stuff);
SAVEI32(PL_lex_defer);
SAVEI32(PL_sublex_info.sub_inwhat);
SAVESPTR(PL_lex_repl);
SAVEINT(PL_expect);
SAVEINT(PL_lex_expect);
PL_lex_state = LEX_NORMAL;
PL_lex_defer = 0;
PL_expect = XSTATE;
PL_lex_brackets = 0;
New(899, PL_lex_brackstack, 120, char);
New(899, PL_lex_casestack, 12, char);
PL_lex_casemods = 0;
*PL_lex_casestack = '\0';
PL_lex_dojoin = 0;
PL_lex_starts = 0;
PL_lex_stuff = Nullsv;
PL_lex_repl = Nullsv;
PL_lex_inpat = 0;
PL_nexttoke = 0;
PL_lex_inwhat = 0;
PL_sublex_info.sub_inwhat = 0;
PL_linestr = line;
if (SvREADONLY(PL_linestr))
PL_linestr = sv_2mortal(newSVsv(PL_linestr));
s = SvPV(PL_linestr, len);
if (!len || s[len-1] != ';') {
if (!(SvFLAGS(PL_linestr) & SVs_TEMP))
PL_linestr = sv_2mortal(newSVsv(PL_linestr));
sv_catpvn(PL_linestr, "\n;", 2);
}
SvTEMP_off(PL_linestr);
PL_oldoldbufptr = PL_oldbufptr = PL_bufptr = PL_linestart = SvPVX(PL_linestr);
PL_bufend = PL_bufptr + SvCUR(PL_linestr);
PL_last_lop = PL_last_uni = Nullch;
PL_rsfp = 0;
}
/*
* Perl_lex_end
* Finalizer for lexing operations. Must be called when the parser is
* done with the lexer.
*/
void
Perl_lex_end(pTHX)
{
PL_doextract = FALSE;
}
/*
* S_incline
* This subroutine has nothing to do with tilting, whether at windmills
* or pinball tables. Its name is short for "increment line". It
* increments the current line number in CopLINE(PL_curcop) and checks
* to see whether the line starts with a comment of the form
* # line 500 "foo.pm"
* If so, it sets the current line number and file to the values in the comment.
*/
STATIC void
S_incline(pTHX_ char *s)
{
char *t;
char *n;
char *e;
char ch;
CopLINE_inc(PL_curcop);
if (*s++ != '#')
return;
while (SPACE_OR_TAB(*s)) s++;
if (strnEQ(s, "line", 4))
s += 4;
else
return;
if (SPACE_OR_TAB(*s))
s++;
else
return;
while (SPACE_OR_TAB(*s)) s++;
if (!isDIGIT(*s))
return;
n = s;
while (isDIGIT(*s))
s++;
while (SPACE_OR_TAB(*s))
s++;
if (*s == '"' && (t = strchr(s+1, '"'))) {
s++;
e = t + 1;
}
else {
for (t = s; !isSPACE(*t); t++) ;
e = t;
}
while (SPACE_OR_TAB(*e) || *e == '\r' || *e == '\f')
e++;
if (*e != '\n' && *e != '\0')
return; /* false alarm */
ch = *t;
*t = '\0';
if (t - s > 0) {
CopFILE_free(PL_curcop);
CopFILE_set(PL_curcop, s);
}
*t = ch;
CopLINE_set(PL_curcop, atoi(n)-1);
}
/*
* S_skipspace
* Called to gobble the appropriate amount and type of whitespace.
* Skips comments as well.
*/
STATIC char *
S_skipspace(pTHX_ register char *s)
{
if (PL_lex_formbrack && PL_lex_brackets <= PL_lex_formbrack) {
while (s < PL_bufend && SPACE_OR_TAB(*s))
s++;
return s;
}
for (;;) {
STRLEN prevlen;
SSize_t oldprevlen, oldoldprevlen;
SSize_t oldloplen = 0, oldunilen = 0;
while (s < PL_bufend && isSPACE(*s)) {
if (*s++ == '\n' && PL_in_eval && !PL_rsfp)
incline(s);
}
/* comment */
if (s < PL_bufend && *s == '#') {
while (s < PL_bufend && *s != '\n')
s++;
if (s < PL_bufend) {
s++;
if (PL_in_eval && !PL_rsfp) {
incline(s);
continue;
}
}
}
/* only continue to recharge the buffer if we're at the end
* of the buffer, we're not reading from a source filter, and
* we're in normal lexing mode
*/
if (s < PL_bufend || !PL_rsfp || PL_sublex_info.sub_inwhat ||
PL_lex_state == LEX_FORMLINE)
return s;
/* try to recharge the buffer */
if ((s = filter_gets(PL_linestr, PL_rsfp,
(prevlen = SvCUR(PL_linestr)))) == Nullch)
{
/* end of file. Add on the -p or -n magic */
if (PL_minus_n || PL_minus_p) {
sv_setpv(PL_linestr,PL_minus_p ?
";}continue{print or die qq(-p destination: $!\\n)" :
"");
sv_catpv(PL_linestr,";}");
PL_minus_n = PL_minus_p = 0;
}
else
sv_setpv(PL_linestr,";");
/* reset variables for next time we lex */
PL_oldoldbufptr = PL_oldbufptr = PL_bufptr = s = PL_linestart
= SvPVX(PL_linestr);
PL_bufend = SvPVX(PL_linestr) + SvCUR(PL_linestr);
PL_last_lop = PL_last_uni = Nullch;
/* Close the filehandle. Could be from -P preprocessor,
* STDIN, or a regular file. If we were reading code from
* STDIN (because the commandline held no -e or filename)
* then we don't close it, we reset it so the code can
* read from STDIN too.
*/
if (PL_preprocess && !PL_in_eval)
(void)PerlProc_pclose(PL_rsfp);
else if ((PerlIO*)PL_rsfp == PerlIO_stdin())
PerlIO_clearerr(PL_rsfp);
else
(void)PerlIO_close(PL_rsfp);
PL_rsfp = Nullfp;
return s;
}
/* not at end of file, so we only read another line */
/* make corresponding updates to old pointers, for yyerror() */
oldprevlen = PL_oldbufptr - PL_bufend;
oldoldprevlen = PL_oldoldbufptr - PL_bufend;
if (PL_last_uni)
oldunilen = PL_last_uni - PL_bufend;
if (PL_last_lop)
oldloplen = PL_last_lop - PL_bufend;
PL_linestart = PL_bufptr = s + prevlen;
PL_bufend = s + SvCUR(PL_linestr);
s = PL_bufptr;
PL_oldbufptr = s + oldprevlen;
PL_oldoldbufptr = s + oldoldprevlen;
if (PL_last_uni)
PL_last_uni = s + oldunilen;
if (PL_last_lop)
PL_last_lop = s + oldloplen;
incline(s);
/* debugger active and we're not compiling the debugger code,
* so store the line into the debugger's array of lines
*/
if (PERLDB_LINE && PL_curstash != PL_debstash) {
SV *sv = NEWSV(85,0);
sv_upgrade(sv, SVt_PVMG);
sv_setpvn(sv,PL_bufptr,PL_bufend-PL_bufptr);
(void)SvIOK_on(sv);
SvIVX(sv) = 0;
av_store(CopFILEAV(PL_curcop),(I32)CopLINE(PL_curcop),sv);
}
}
}
/*
* S_check_uni
* Check the unary operators to ensure there's no ambiguity in how they're
* used. An ambiguous piece of code would be:
* rand + 5
* This doesn't mean rand() + 5. Because rand() is a unary operator,
* the +5 is its argument.
*/
STATIC void
S_check_uni(pTHX)
{
char *s;
char *t;
if (PL_oldoldbufptr != PL_last_uni)
return;
while (isSPACE(*PL_last_uni))
PL_last_uni++;
for (s = PL_last_uni; isALNUM_lazy_if(s,UTF) || *s == '-'; s++) ;
if ((t = strchr(s, '(')) && t < PL_bufptr)
return;
if (ckWARN_d(WARN_AMBIGUOUS)){
char ch = *s;
*s = '\0';
Perl_warner(aTHX_ packWARN(WARN_AMBIGUOUS),
"Warning: Use of \"%s\" without parens is ambiguous",
PL_last_uni);
*s = ch;
}
}
/*
* LOP : macro to build a list operator. Its behaviour has been replaced
* with a subroutine, S_lop() for which LOP is just another name.
*/
#define LOP(f,x) return lop(f,x,s)
/*
* S_lop
* Build a list operator (or something that might be one). The rules:
* - if we have a next token, then it's a list operator [why?]
* - if the next thing is an opening paren, then it's a function
* - else it's a list operator
*/
STATIC I32
S_lop(pTHX_ I32 f, int x, char *s)
{
yylval.ival = f;
CLINE;
REPORT("lop", f)
PL_expect = x;
PL_bufptr = s;
PL_last_lop = PL_oldbufptr;
PL_last_lop_op = (OPCODE)f;
if (PL_nexttoke)
return LSTOP;
if (*s == '(')
return FUNC;
s = skipspace(s);
if (*s == '(')
return FUNC;
else
return LSTOP;
}
/*
* S_force_next
* When the lexer realizes it knows the next token (for instance,
* it is reordering tokens for the parser) then it can call S_force_next
* to know what token to return the next time the lexer is called. Caller
* will need to set PL_nextval[], and possibly PL_expect to ensure the lexer
* handles the token correctly.
*/
STATIC void
S_force_next(pTHX_ I32 type)
{
PL_nexttype[PL_nexttoke] = type;
PL_nexttoke++;
if (PL_lex_state != LEX_KNOWNEXT) {
PL_lex_defer = PL_lex_state;
PL_lex_expect = PL_expect;
PL_lex_state = LEX_KNOWNEXT;
}
}
/*
* S_force_word
* When the lexer knows the next thing is a word (for instance, it has
* just seen -> and it knows that the next char is a word char, then
* it calls S_force_word to stick the next word into the PL_next lookahead.
*
* Arguments:
* char *start : buffer position (must be within PL_linestr)
* int token : PL_next will be this type of bare word (e.g., METHOD,WORD)
* int check_keyword : if true, Perl checks to make sure the word isn't
* a keyword (do this if the word is a label, e.g. goto FOO)
* int allow_pack : if true, : characters will also be allowed (require,
* use, etc. do this)
* int allow_initial_tick : used by the "sub" lexer only.
*/
STATIC char *
S_force_word(pTHX_ register char *start, int token, int check_keyword, int allow_pack, int allow_initial_tick)
{
register char *s;
STRLEN len;
start = skipspace(start);
s = start;
if (isIDFIRST_lazy_if(s,UTF) ||
(allow_pack && *s == ':') ||
(allow_initial_tick && *s == '\'') )
{
s = scan_word(s, PL_tokenbuf, sizeof PL_tokenbuf, allow_pack, &len);
if (check_keyword && keyword(PL_tokenbuf, len))
return start;
if (token == METHOD) {
s = skipspace(s);
if (*s == '(')
PL_expect = XTERM;
else {
PL_expect = XOPERATOR;
}
}
PL_nextval[PL_nexttoke].opval = (OP*)newSVOP(OP_CONST,0, newSVpv(PL_tokenbuf,0));
PL_nextval[PL_nexttoke].opval->op_private |= OPpCONST_BARE;
force_next(token);
}
return s;
}
/*
* S_force_ident
* Called when the lexer wants $foo *foo &foo etc, but the program
* text only contains the "foo" portion. The first argument is a pointer
* to the "foo", and the second argument is the type symbol to prefix.
* Forces the next token to be a "WORD".
* Creates the symbol if it didn't already exist (via gv_fetchpv()).
*/
STATIC void
S_force_ident(pTHX_ register char *s, int kind)
{
if (s && *s) {
OP* o = (OP*)newSVOP(OP_CONST, 0, newSVpv(s,0));
PL_nextval[PL_nexttoke].opval = o;
force_next(WORD);
if (kind) {
o->op_private = OPpCONST_ENTERED;
/* XXX see note in pp_entereval() for why we forgo typo
warnings if the symbol must be introduced in an eval.
GSAR 96-10-12 */
gv_fetchpv(s, PL_in_eval ? (GV_ADDMULTI | GV_ADDINEVAL) : TRUE,
kind == '$' ? SVt_PV :
kind == '@' ? SVt_PVAV :
kind == '%' ? SVt_PVHV :
SVt_PVGV
);
}
}
}
NV
Perl_str_to_version(pTHX_ SV *sv)
{
NV retval = 0.0;
NV nshift = 1.0;
STRLEN len;
char *start = SvPVx(sv,len);
bool utf = SvUTF8(sv) ? TRUE : FALSE;
char *end = start + len;
while (start < end) {
STRLEN skip;
UV n;
if (utf)
n = utf8n_to_uvchr((U8*)start, len, &skip, 0);
else {
n = *(U8*)start;
skip = 1;
}
retval += ((NV)n)/nshift;
start += skip;
nshift *= 1000;
}
return retval;
}
/*
* S_force_version
* Forces the next token to be a version number.
* If the next token appears to be an invalid version number, (e.g. "v2b"),
* and if "guessing" is TRUE, then no new token is created (and the caller
* must use an alternative parsing method).
*/
STATIC char *
S_force_version(pTHX_ char *s, int guessing)
{
OP *version = Nullop;
char *d;
s = skipspace(s);
d = s;
if (*d == 'v')
d++;
if (isDIGIT(*d)) {
while (isDIGIT(*d) || *d == '_' || *d == '.')
d++;
if (*d == ';' || isSPACE(*d) || *d == '}' || !*d) {
SV *ver;
s = scan_num(s, &yylval);
version = yylval.opval;
ver = cSVOPx(version)->op_sv;
if (SvPOK(ver) && !SvNIOK(ver)) {
(void)SvUPGRADE(ver, SVt_PVNV);
SvNVX(ver) = str_to_version(ver);
SvNOK_on(ver); /* hint that it is a version */
}
}
else if (guessing)
return s;
}
/* NOTE: The parser sees the package name and the VERSION swapped */
PL_nextval[PL_nexttoke].opval = version;
force_next(WORD);
return s;
}
/*
* S_tokeq
* Tokenize a quoted string passed in as an SV. It finds the next
* chunk, up to end of string or a backslash. It may make a new
* SV containing that chunk (if HINT_NEW_STRING is on). It also
* turns \\ into \.
*/
STATIC SV *
S_tokeq(pTHX_ SV *sv)
{
register char *s;
register char *send;
register char *d;
STRLEN len = 0;
SV *pv = sv;
if (!SvLEN(sv))
goto finish;
s = SvPV_force(sv, len);
if (SvTYPE(sv) >= SVt_PVIV && SvIVX(sv) == -1)
goto finish;
send = s + len;
while (s < send && *s != '\\')
s++;
if (s == send)
goto finish;
d = s;
if ( PL_hints & HINT_NEW_STRING ) {
pv = sv_2mortal(newSVpvn(SvPVX(pv), len));
if (SvUTF8(sv))
SvUTF8_on(pv);
}
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));
finish:
if ( PL_hints & HINT_NEW_STRING )
return new_constant(NULL, 0, "q", sv, pv, "q");
return sv;
}
/*
* Now come three functions related to double-quote context,
* S_sublex_start, S_sublex_push, and S_sublex_done. They're used when
* converting things like "\u\Lgnat" into ucfirst(lc("gnat")). They
* interact with PL_lex_state, and create fake ( ... ) argument lists
* to handle functions and concatenation.
* They assume that whoever calls them will be setting up a fake
* join call, because each subthing puts a ',' after it. This lets
* "lower \luPpEr"
* become
* join($, , 'lower ', lcfirst( 'uPpEr', ) ,)
*
* (I'm not sure whether the spurious commas at the end of lcfirst's
* arguments and join's arguments are created or not).
*/
/*
* S_sublex_start
* Assumes that yylval.ival is the op we're creating (e.g. OP_LCFIRST).
*
* Pattern matching will set PL_lex_op to the pattern-matching op to
* make (we return THING if yylval.ival is OP_NULL, PMFUNC otherwise).
*
* OP_CONST and OP_READLINE are easy--just make the new op and return.
*
* Everything else becomes a FUNC.
*
* Sets PL_lex_state to LEX_INTERPPUSH unless (ival was OP_NULL or we
* had an OP_CONST or OP_READLINE). This just sets us up for a
* call to S_sublex_push().
*/
STATIC I32
S_sublex_start(pTHX)
{
register I32 op_type = yylval.ival;
if (op_type == OP_NULL) {
yylval.opval = PL_lex_op;
PL_lex_op = Nullop;
return THING;
}
if (op_type == OP_CONST || op_type == OP_READLINE) {
SV *sv = tokeq(PL_lex_stuff);
if (SvTYPE(sv) == SVt_PVIV) {
/* Overloaded constants, nothing fancy: Convert to SVt_PV: */
STRLEN len;
char *p;
SV *nsv;
p = SvPV(sv, len);
nsv = newSVpvn(p, len);
if (SvUTF8(sv))
SvUTF8_on(nsv);
SvREFCNT_dec(sv);
sv = nsv;
}
yylval.opval = (OP*)newSVOP(op_type, 0, sv);