[p5sagit/Function-Parameters.git] / Parameters.xs

/*
Copyright 2012 Lukas Mai.

This program is free software; you can redistribute it and/or modify it
under the terms of either: the GNU General Public License as published
by the Free Software Foundation; or the Artistic License.

See http://dev.perl.org/licenses/ for more information.
 */

#ifdef __GNUC__
 #if (__GNUC__ == 4 && __GNUC_MINOR__ >= 6) || __GNUC__ >= 5
  #define PRAGMA_GCC_(X) _Pragma(#X)
  #define PRAGMA_GCC(X) PRAGMA_GCC_(GCC X)
 #endif
#endif

#ifndef PRAGMA_GCC
 #define PRAGMA_GCC(X)
#endif

#ifdef DEVEL
 #define WARNINGS_RESET PRAGMA_GCC(diagnostic pop)
 #define WARNINGS_ENABLEW(X) PRAGMA_GCC(diagnostic warning #X)
 #define WARNINGS_ENABLE \
 	WARNINGS_ENABLEW(-Wall) \
 	WARNINGS_ENABLEW(-Wextra) \
 	WARNINGS_ENABLEW(-Wundef) \
 	/* WARNINGS_ENABLEW(-Wshadow) :-( */ \
 	WARNINGS_ENABLEW(-Wbad-function-cast) \
 	WARNINGS_ENABLEW(-Wcast-align) \
 	WARNINGS_ENABLEW(-Wwrite-strings) \
 	/* WARNINGS_ENABLEW(-Wnested-externs) wtf? */ \
 	WARNINGS_ENABLEW(-Wstrict-prototypes) \
 	WARNINGS_ENABLEW(-Wmissing-prototypes) \
 	WARNINGS_ENABLEW(-Winline) \
 	WARNINGS_ENABLEW(-Wdisabled-optimization)

#else
 #define WARNINGS_RESET
 #define WARNINGS_ENABLE
#endif


#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#include <string.h>

WARNINGS_ENABLE

#define MY_PKG "Function::Parameters"

#define HINTK_KEYWORDS MY_PKG "/keywords"
#define HINTK_NAME_    MY_PKG "/name:"
#define HINTK_SHIFT_   MY_PKG "/shift:"
#define HINTK_ATTRS_   MY_PKG "/attrs:"

#define HAVE_PERL_VERSION(R, V, S) \
	(PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S))))))

#if HAVE_PERL_VERSION(5, 16, 0)
 #define IF_HAVE_PERL_5_16(YES, NO) YES
#else
 #define IF_HAVE_PERL_5_16(YES, NO) NO
#endif

typedef struct {
	enum {
		FLAG_NAME_OPTIONAL = 1,
		FLAG_NAME_REQUIRED,
		FLAG_NAME_PROHIBITED
	} name;
	SV *shift;
	SV *attrs;
} Spec;

static int (*next_keyword_plugin)(pTHX_ char *, STRLEN, OP **);

static int kw_flags(pTHX_ const char *kw_ptr, STRLEN kw_len, Spec *spec) {
	HV *hints;
	SV *sv, **psv;
	const char *p, *kw_active;
	STRLEN kw_active_len;

	spec->name = 0;
	spec->shift = sv_2mortal(newSVpvs(""));
	spec->attrs = sv_2mortal(newSVpvs(""));

	if (!(hints = GvHV(PL_hintgv))) {
		return FALSE;
	}
	if (!(psv = hv_fetchs(hints, HINTK_KEYWORDS, 0))) {
		return FALSE;
	}
	sv = *psv;
	kw_active = SvPV(sv, kw_active_len);
	if (kw_active_len <= kw_len) {
		return FALSE;
	}
	for (
		p = kw_active;
		(p = strchr(p, *kw_ptr)) &&
		p < kw_active + kw_active_len - kw_len;
		p++
	) {
		if (
			(p == kw_active || p[-1] == ' ') &&
			p[kw_len] == ' ' &&
			memcmp(kw_ptr, p, kw_len) == 0
		) {

#define FETCH_HINTK_INTO(NAME, PTR, LEN, X) STMT_START { \
	const char *fk_ptr_; \
	STRLEN fk_len_; \
	SV *fk_sv_; \
	fk_sv_ = sv_2mortal(newSVpvs(HINTK_ ## NAME)); \
	sv_catpvn(fk_sv_, PTR, LEN); \
	fk_ptr_ = SvPV(fk_sv_, fk_len_); \
	if (!((X) = hv_fetch(hints, fk_ptr_, fk_len_, 0))) { \
		croak("%s: internal error: $^H{'%.*s'} not set", MY_PKG, (int)fk_len_, fk_ptr_); \
	} \
} STMT_END

			FETCH_HINTK_INTO(NAME_, kw_ptr, kw_len, psv);
			spec->name = SvIV(*psv);

			FETCH_HINTK_INTO(SHIFT_, kw_ptr, kw_len, psv);
			SvSetSV(spec->shift, *psv);

			FETCH_HINTK_INTO(ATTRS_, kw_ptr, kw_len, psv);
			SvSetSV(spec->attrs, *psv);

#undef FETCH_HINTK_INTO
			return TRUE;
		}
	}
	return FALSE;
}


#include "toke_on_crack.c.inc"


static void free_ptr_op(pTHX_ void *vp) {
	OP **pp = vp;
	op_free(*pp);
	Safefree(pp);
}

#define sv_eq_pvs(SV, S) sv_eq_pvn(aTHX_ SV, "" S "", sizeof (S) - 1)

static int sv_eq_pvn(pTHX_ SV *sv, const char *p, STRLEN n) {
	STRLEN sv_len;
	const char *sv_p = SvPV(sv, sv_len);
	return
		sv_len == n &&
		memcmp(sv_p, p, n) == 0
	;
}


#include "padop_on_crack.c.inc"


#if 0
static PADOFFSET pad_add_my_sv(SV *name) {
	PADOFFSET offset;
	SV *namesv, *myvar;
	char *p;
	STRLEN len;

	p = SvPV(name, len);
	myvar = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, 1);
	offset = AvFILLp(PL_comppad);
	SvPADMY_on(myvar);
	if (*p == '@') {
		SvUPGRADE(myvar, SVt_PVAV);
	} else if (*p == '%') {
		SvUPGRADE(myvar, SVt_PVHV);
	}
	PL_curpad = AvARRAY(PL_comppad);
	namesv = newSV_type(SVt_PVMG);
	sv_setpvn(namesv, p, len);
	COP_SEQ_RANGE_LOW_set(namesv, PL_cop_seqmax);
	COP_SEQ_RANGE_HIGH_set(namesv, PERL_PADSEQ_INTRO);
	PL_cop_seqmax++;
	av_store(PL_comppad_name, offset, namesv);
	return offset;
}
#endif

enum {
	MY_ATTR_LVALUE = 0x01,
	MY_ATTR_METHOD = 0x02,
	MY_ATTR_SPECIAL = 0x04
};

static int parse_fun(pTHX_ OP **pop, const char *keyword_ptr, STRLEN keyword_len, const Spec *spec) {
	SV *declarator;
	I32 floor_ix;
	SV *saw_name;
	AV *params;
	SV *proto;
	OP **attrs_sentinel, *body;
	unsigned builtin_attrs;
	int saw_colon;
	STRLEN len;
	char *s;
	I32 c;

	declarator = sv_2mortal(newSVpvn(keyword_ptr, keyword_len));

	lex_read_space(0);

	builtin_attrs = 0;

	/* function name */
	saw_name = NULL;
	s = PL_parser->bufptr;
	if (spec->name != FLAG_NAME_PROHIBITED && (len = S_scan_word(aTHX_ s, TRUE))) {
		saw_name = sv_2mortal(newSVpvn_flags(s, len, PARSING_UTF ? SVf_UTF8 : 0));

		if (PL_parser->expect != XSTATE) {
			/* bail out early so we don't predeclare $saw_name */
			croak("In %"SVf": I was expecting a function body, not \"%"SVf"\"", SVfARG(declarator), SVfARG(saw_name));
		}

		sv_catpvs(declarator, " ");
		sv_catsv(declarator, saw_name);

		if (
			sv_eq_pvs(saw_name, "BEGIN") ||
			sv_eq_pvs(saw_name, "END") ||
			sv_eq_pvs(saw_name, "INIT") ||
			sv_eq_pvs(saw_name, "CHECK") ||
			sv_eq_pvs(saw_name, "UNITCHECK")
		) {
			builtin_attrs |= MY_ATTR_SPECIAL;
		}

		lex_read_to(s + len);
		lex_read_space(0);
	} else if (spec->name == FLAG_NAME_REQUIRED) {
		croak("I was expecting a function name, not \"%.*s\"", (int)(PL_parser->bufend - s), s);
	} else {
		sv_catpvs(declarator, " (anon)");
	}

	floor_ix = start_subparse(FALSE, saw_name ? 0 : CVf_ANON);
	SAVEFREESV(PL_compcv);

	/* parameters */
	params = NULL;
	c = lex_peek_unichar(0);
	if (c == '(') {
		SV *saw_slurpy = NULL;

		lex_read_unichar(0);
		lex_read_space(0);

		params = newAV();
		sv_2mortal((SV *)params);

		for (;;) {
			c = lex_peek_unichar(0);
			if (c == '$' || c == '@' || c == '%') {
				SV *param;

				lex_read_unichar(0);
				lex_read_space(0);

				s = PL_parser->bufptr;
				if (!(len = S_scan_word(aTHX_ s, FALSE))) {
					croak("In %"SVf": missing identifier", SVfARG(declarator));
				}
				param = sv_2mortal(newSVpvf("%c%.*s", (int)c, (int)len, s));
				if (saw_slurpy) {
					croak("In %"SVf": I was expecting \")\" after \"%"SVf"\", not \"%"SVf"\"", SVfARG(declarator), SVfARG(saw_slurpy), SVfARG(param));
				}
				if (c != '$') {
					saw_slurpy = param;
				}
				av_push(params, SvREFCNT_inc_simple_NN(param));
				lex_read_to(s + len);
				lex_read_space(0);

				c = lex_peek_unichar(0);
				if (c == ',') {
					lex_read_unichar(0);
					lex_read_space(0);
					continue;
				}
			}

			if (c == ')') {
				lex_read_unichar(0);
				lex_read_space(0);
				break;
			}

			if (c == -1) {
				croak("In %"SVf": unexpected EOF in parameter list", SVfARG(declarator));
			}
			croak("In %"SVf": unexpected '%c' in parameter list", SVfARG(declarator), (int)c);
		}
	}

	/* prototype */
	proto = NULL;
	saw_colon = 0;
	c = lex_peek_unichar(0);
	if (c == ':') {
		lex_read_unichar(0);
		lex_read_space(0);

		c = lex_peek_unichar(0);
		if (c != '(') {
			lex_stuff_pvs(":", 0);
			c = ':';
		} else {
			proto = sv_2mortal(newSVpvs(""));
			if (!S_scan_str(aTHX_ proto, FALSE, FALSE)) {
				croak("In %"SVf": prototype not terminated", SVfARG(declarator));
			}
			S_check_prototype(aTHX_ declarator, proto);
			lex_read_space(0);
			c = lex_peek_unichar(0);
		}
	}

	/* surprise predeclaration! */
	if (saw_name) {
		/* 'sub NAME (PROTO);' to make name/proto known to perl before it
		   starts parsing the body */
		SvREFCNT_inc_simple_void(PL_compcv);

		newATTRSUB(
			floor_ix,
			newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(saw_name)),
			proto ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(proto)) : NULL,
			NULL,
			NULL
		);

		floor_ix = start_subparse(FALSE, 0);
		SAVEFREESV(PL_compcv);
	}


	/* attributes */
	Newx(attrs_sentinel, 1, OP *);
	*attrs_sentinel = NULL;
	SAVEDESTRUCTOR_X(free_ptr_op, attrs_sentinel);

	if (c == ':' || c == '{') {

		/* kludge default attributes in */
		if (SvTRUE(spec->attrs) && SvPV_nolen(spec->attrs)[0] == ':') {
			lex_stuff_sv(spec->attrs, 0);
			c = ':';
		}

		if (c == ':') {
			lex_read_unichar(0);
			lex_read_space(0);
			c = lex_peek_unichar(0);

			for (;;) {
				SV *attr;

				s = PL_parser->bufptr;
				if (!(len = S_scan_word(aTHX_ s, FALSE))) {
					break;
				}

				attr = sv_2mortal(newSVpvn_flags(s, len, PARSING_UTF ? SVf_UTF8 : 0));

				lex_read_to(s + len);
				lex_read_space(0);
				c = lex_peek_unichar(0);

				if (c != '(') {
					if (sv_eq_pvs(attr, "lvalue")) {
						builtin_attrs |= MY_ATTR_LVALUE;
						attr = NULL;
					} else if (sv_eq_pvs(attr, "method")) {
						builtin_attrs |= MY_ATTR_METHOD;
						attr = NULL;
					}
				} else {
					SV *sv = sv_2mortal(newSVpvs(""));
					if (!S_scan_str(aTHX_ sv, TRUE, TRUE)) {
						croak("In %"SVf": unterminated attribute parameter in attribute list", SVfARG(declarator));
					}
					sv_catsv(attr, sv);

					lex_read_space(0);
					c = lex_peek_unichar(0);
				}

				if (attr) {
					*attrs_sentinel = op_append_elem(OP_LIST, *attrs_sentinel, newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(attr)));
				}

				if (c == ':') {
					lex_read_unichar(0);
					lex_read_space(0);
					c = lex_peek_unichar(0);
				}
			}
		}
	}

	/* body */
	if (c != '{') {
		croak("In %"SVf": I was expecting a function body, not \"%c\"", SVfARG(declarator), (int)c);
	}

	if (builtin_attrs & MY_ATTR_LVALUE) {
		CvLVALUE_on(PL_compcv);
	}
	if (builtin_attrs & MY_ATTR_METHOD) {
		CvMETHOD_on(PL_compcv);
	}
	if (builtin_attrs & MY_ATTR_SPECIAL) {
		CvSPECIAL_on(PL_compcv);
	}

	/* munge */
	{
		/* create outer block: '{' */
		const int save_ix = S_block_start(aTHX_ TRUE);
		OP *init = NULL;

		/* my $self = shift; */
		if (SvTRUE(spec->shift)) {
			OP *const var = newOP(OP_PADSV, OPf_WANT_SCALAR | (OPpLVAL_INTRO << 8));
			var->op_targ = pad_add_name_sv(spec->shift, 0, NULL, NULL);

			init = newASSIGNOP(OPf_STACKED, var, 0, newOP(OP_SHIFT, 0));
			init = newSTATEOP(0, NULL, init);
		}

		/* my (PARAMS) = @_; */
		if (params && av_len(params) > -1) {
			SV *param;
			OP *init_param, *left, *right;

			left = NULL;
			while ((param = av_shift(params)) != &PL_sv_undef) {
				OP *const var = newOP(OP_PADSV, OPf_WANT_LIST | (OPpLVAL_INTRO << 8));
				var->op_targ = pad_add_name_sv(param, 0, NULL, NULL);
				SvREFCNT_dec(param);
				left = op_append_elem(OP_LIST, left, var);
			}

			left->op_flags |= OPf_PARENS;
			right = newAVREF(newGVOP(OP_GV, 0, PL_defgv));
			init_param = newASSIGNOP(OPf_STACKED, left, 0, right);
			init_param = newSTATEOP(0, NULL, init_param);

			init = op_append_list(OP_LINESEQ, init, init_param);
		}

		/* add '();' to make function return nothing by default */
		/* (otherwise the invisible parameter initialization can "leak" into
		   the return value: fun ($x) {}->("asdf", 0) == 2) */
		if (init) {
			init = op_append_list(OP_LINESEQ, init, newSTATEOP(0, NULL, newOP(OP_STUB, OPf_PARENS)));
		}

		/* finally let perl parse the actual subroutine body */
		body = parse_block(0);

		body = op_append_list(OP_LINESEQ, init, body);

		/* close outer block: '}' */
		S_block_end(aTHX_ save_ix, body);
	}

	/* it's go time. */
	{
		OP *const attrs = *attrs_sentinel;
		*attrs_sentinel = NULL;
		SvREFCNT_inc_simple_void(PL_compcv);

		if (!saw_name) {
			*pop = newANONATTRSUB(
				floor_ix,
				proto ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(proto)) : NULL,
				attrs,
				body
			);
			return KEYWORD_PLUGIN_EXPR;
		}

		newATTRSUB(
			floor_ix,
			newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(saw_name)),
			proto ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(proto)) : NULL,
			attrs,
			body
		);
		*pop = NULL;
		return KEYWORD_PLUGIN_STMT;
	}
}

static int my_keyword_plugin(pTHX_ char *keyword_ptr, STRLEN keyword_len, OP **op_ptr) {
	Spec spec;
	int ret;

	SAVETMPS;

	if (kw_flags(aTHX_ keyword_ptr, keyword_len, &spec)) {
		ret = parse_fun(aTHX_ op_ptr, keyword_ptr, keyword_len, &spec);
	} else {
		ret = next_keyword_plugin(aTHX_ keyword_ptr, keyword_len, op_ptr);
	}

	FREETMPS;

	return ret;
}

WARNINGS_RESET

MODULE = Function::Parameters   PACKAGE = Function::Parameters
PROTOTYPES: ENABLE

BOOT:
WARNINGS_ENABLE {
	HV *const stash = gv_stashpvs(MY_PKG, GV_ADD);
	/**/
	newCONSTSUB(stash, "FLAG_NAME_OPTIONAL", newSViv(FLAG_NAME_OPTIONAL));
	newCONSTSUB(stash, "FLAG_NAME_REQUIRED", newSViv(FLAG_NAME_REQUIRED));
	newCONSTSUB(stash, "FLAG_NAME_PROHIBITED", newSViv(FLAG_NAME_PROHIBITED));
	newCONSTSUB(stash, "HINTK_KEYWORDS", newSVpvs(HINTK_KEYWORDS));
	newCONSTSUB(stash, "HINTK_NAME_", newSVpvs(HINTK_NAME_));
	newCONSTSUB(stash, "HINTK_SHIFT_", newSVpvs(HINTK_SHIFT_));
	newCONSTSUB(stash, "HINTK_ATTRS_", newSVpvs(HINTK_ATTRS_));
	/**/
	next_keyword_plugin = PL_keyword_plugin;
	PL_keyword_plugin = my_keyword_plugin;
} WARNINGS_RESET
Commit	Line	Data
db81d362	1	/*
	2	Copyright 2012 Lukas Mai.
	3
	4	This program is free software; you can redistribute it and/or modify it
	5	under the terms of either: the GNU General Public License as published
	6	by the Free Software Foundation; or the Artistic License.
	7
	8	See http://dev.perl.org/licenses/ for more information.
	9	*/
	10
	11	#ifdef __GNUC__
	12	#if (__GNUC__ == 4 && __GNUC_MINOR__ >= 6) \|\| __GNUC__ >= 5
	13	#define PRAGMA_GCC_(X) _Pragma(#X)
	14	#define PRAGMA_GCC(X) PRAGMA_GCC_(GCC X)
	15	#endif
	16	#endif
	17
	18	#ifndef PRAGMA_GCC
	19	#define PRAGMA_GCC(X)
	20	#endif
	21
	22	#ifdef DEVEL
	23	#define WARNINGS_RESET PRAGMA_GCC(diagnostic pop)
	24	#define WARNINGS_ENABLEW(X) PRAGMA_GCC(diagnostic warning #X)
	25	#define WARNINGS_ENABLE \
	26	WARNINGS_ENABLEW(-Wall) \
	27	WARNINGS_ENABLEW(-Wextra) \
	28	WARNINGS_ENABLEW(-Wundef) \
c3e72f35	29	/* WARNINGS_ENABLEW(-Wshadow) :-( */ \
db81d362	30	WARNINGS_ENABLEW(-Wbad-function-cast) \
	31	WARNINGS_ENABLEW(-Wcast-align) \
	32	WARNINGS_ENABLEW(-Wwrite-strings) \
	33	/* WARNINGS_ENABLEW(-Wnested-externs) wtf? */ \
	34	WARNINGS_ENABLEW(-Wstrict-prototypes) \
	35	WARNINGS_ENABLEW(-Wmissing-prototypes) \
	36	WARNINGS_ENABLEW(-Winline) \
	37	WARNINGS_ENABLEW(-Wdisabled-optimization)
	38
	39	#else
	40	#define WARNINGS_RESET
1bc47886	41	#define WARNINGS_ENABLE
db81d362	42	#endif
	43
	44
7dd35535	45	#define PERL_NO_GET_CONTEXT
db81d362	46	#include "EXTERN.h"
	47	#include "perl.h"
	48	#include "XSUB.h"
	49
	50	#include <string.h>
	51
	52	WARNINGS_ENABLE
	53
	54	#define MY_PKG "Function::Parameters"
	55
	56	#define HINTK_KEYWORDS MY_PKG "/keywords"
	57	#define HINTK_NAME_ MY_PKG "/name:"
	58	#define HINTK_SHIFT_ MY_PKG "/shift:"
b72eb6ee	59	#define HINTK_ATTRS_ MY_PKG "/attrs:"
db81d362	60
7dd35535	61	#define HAVE_PERL_VERSION(R, V, S) \
	62	(PERL_REVISION > (R) \|\| (PERL_REVISION == (R) && (PERL_VERSION > (V) \|\| (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S))))))
	63
de013990	64	#if HAVE_PERL_VERSION(5, 16, 0)
	65	#define IF_HAVE_PERL_5_16(YES, NO) YES
	66	#else
	67	#define IF_HAVE_PERL_5_16(YES, NO) NO
	68	#endif
	69
db81d362	70	typedef struct {
	71	enum {
	72	FLAG_NAME_OPTIONAL = 1,
	73	FLAG_NAME_REQUIRED,
	74	FLAG_NAME_PROHIBITED
	75	} name;
b72eb6ee	76	SV *shift;
b72eb6ee	77	SV *attrs;
db81d362	78	} Spec;
	79
	80	static int (next_keyword_plugin)(pTHX_ char , STRLEN, OP **);
	81
7dd35535	82	static int kw_flags(pTHX_ const char kw_ptr, STRLEN kw_len, Spec spec) {
db81d362	83	HV *hints;
	84	SV sv, *psv;
	85	const char p, kw_active;
	86	STRLEN kw_active_len;
	87
	88	spec->name = 0;
b72eb6ee	89	spec->shift = sv_2mortal(newSVpvs(""));
b72eb6ee	90	spec->attrs = sv_2mortal(newSVpvs(""));
db81d362	91
	92	if (!(hints = GvHV(PL_hintgv))) {
	93	return FALSE;
	94	}
	95	if (!(psv = hv_fetchs(hints, HINTK_KEYWORDS, 0))) {
	96	return FALSE;
	97	}
	98	sv = *psv;
	99	kw_active = SvPV(sv, kw_active_len);
	100	if (kw_active_len <= kw_len) {
	101	return FALSE;
	102	}
e88490f6	103	for (
	104	p = kw_active;
	105	(p = strchr(p, *kw_ptr)) &&
	106	p < kw_active + kw_active_len - kw_len;
	107	p++
	108	) {
db81d362	109	if (
	110	(p == kw_active \|\| p[-1] == ' ') &&
	111	p[kw_len] == ' ' &&
	112	memcmp(kw_ptr, p, kw_len) == 0
	113	) {
b72eb6ee	114
d970c3e7	115	#define FETCH_HINTK_INTO(NAME, PTR, LEN, X) STMT_START { \
b72eb6ee	116	const char *fk_ptr_; \
	117	STRLEN fk_len_; \
	118	SV *fk_sv_; \
	119	fk_sv_ = sv_2mortal(newSVpvs(HINTK_ ## NAME)); \
	120	sv_catpvn(fk_sv_, PTR, LEN); \
	121	fk_ptr_ = SvPV(fk_sv_, fk_len_); \
	122	if (!((X) = hv_fetch(hints, fk_ptr_, fk_len_, 0))) { \
	123	croak("%s: internal error: $^H{'%.*s'} not set", MY_PKG, (int)fk_len_, fk_ptr_); \
	124	} \
d970c3e7	125	} STMT_END
b72eb6ee	126
b72eb6ee	127	FETCH_HINTK_INTO(NAME_, kw_ptr, kw_len, psv);
db81d362	128	spec->name = SvIV(*psv);
db81d362	129
b72eb6ee	130	FETCH_HINTK_INTO(SHIFT_, kw_ptr, kw_len, psv);
b72eb6ee	131	SvSetSV(spec->shift, *psv);
db81d362	132
b72eb6ee	133	FETCH_HINTK_INTO(ATTRS_, kw_ptr, kw_len, psv);
	134	SvSetSV(spec->attrs, *psv);
	135
	136	#undef FETCH_HINTK_INTO
db81d362	137	return TRUE;
	138	}
	139	}
	140	return FALSE;
	141	}
	142
	143
	144	#include "toke_on_crack.c.inc"
	145
	146
311ced6f	147	static void free_ptr_op(pTHX_ void *vp) {
c311cef3	148	OP **pp = vp;
	149	op_free(*pp);
	150	Safefree(pp);
	151	}
	152
311ced6f	153	#define sv_eq_pvs(SV, S) sv_eq_pvn(aTHX_ SV, "" S "", sizeof (S) - 1)
c311cef3	154
311ced6f	155	static int sv_eq_pvn(pTHX_ SV sv, const char p, STRLEN n) {
c311cef3	156	STRLEN sv_len;
	157	const char *sv_p = SvPV(sv, sv_len);
	158	return
	159	sv_len == n &&
	160	memcmp(sv_p, p, n) == 0
	161	;
	162	}
	163
	164
	165	#include "padop_on_crack.c.inc"
	166
	167
	168	#if 0
	169	static PADOFFSET pad_add_my_sv(SV *name) {
	170	PADOFFSET offset;
	171	SV namesv, myvar;
	172	char *p;
	173	STRLEN len;
	174
	175	p = SvPV(name, len);
	176	myvar = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, 1);
	177	offset = AvFILLp(PL_comppad);
	178	SvPADMY_on(myvar);
	179	if (*p == '@') {
	180	SvUPGRADE(myvar, SVt_PVAV);
	181	} else if (*p == '%') {
	182	SvUPGRADE(myvar, SVt_PVHV);
	183	}
	184	PL_curpad = AvARRAY(PL_comppad);
	185	namesv = newSV_type(SVt_PVMG);
	186	sv_setpvn(namesv, p, len);
	187	COP_SEQ_RANGE_LOW_set(namesv, PL_cop_seqmax);
	188	COP_SEQ_RANGE_HIGH_set(namesv, PERL_PADSEQ_INTRO);
	189	PL_cop_seqmax++;
	190	av_store(PL_comppad_name, offset, namesv);
	191	return offset;
	192	}
	193	#endif
	194
	195	enum {
	196	MY_ATTR_LVALUE = 0x01,
	197	MY_ATTR_METHOD = 0x02,
	198	MY_ATTR_SPECIAL = 0x04
	199	};
	200
7dd35535	201	static int parse_fun(pTHX_ OP *pop, const char keyword_ptr, STRLEN keyword_len, const Spec *spec) {
c311cef3	202	SV *declarator;
	203	I32 floor_ix;
	204	SV *saw_name;
	205	AV *params;
	206	SV *proto;
	207	OP *attrs_sentinel, body;
	208	unsigned builtin_attrs;
	209	int saw_colon;
db81d362	210	STRLEN len;
	211	char *s;
	212	I32 c;
	213
db81d362	214	declarator = sv_2mortal(newSVpvn(keyword_ptr, keyword_len));
db81d362	215
db81d362	216	lex_read_space(0);
db81d362	217
c311cef3	218	builtin_attrs = 0;
c311cef3	219
db81d362	220	/* function name */
c311cef3	221	saw_name = NULL;
db81d362	222	s = PL_parser->bufptr;
7dd35535	223	if (spec->name != FLAG_NAME_PROHIBITED && (len = S_scan_word(aTHX_ s, TRUE))) {
c311cef3	224	saw_name = sv_2mortal(newSVpvn_flags(s, len, PARSING_UTF ? SVf_UTF8 : 0));
	225
	226	if (PL_parser->expect != XSTATE) {
	227	/* bail out early so we don't predeclare $saw_name */
	228	croak("In %"SVf": I was expecting a function body, not \"%"SVf"\"", SVfARG(declarator), SVfARG(saw_name));
	229	}
	230
db81d362	231	sv_catpvs(declarator, " ");
c311cef3	232	sv_catsv(declarator, saw_name);
	233
	234	if (
	235	sv_eq_pvs(saw_name, "BEGIN") \|\|
	236	sv_eq_pvs(saw_name, "END") \|\|
	237	sv_eq_pvs(saw_name, "INIT") \|\|
	238	sv_eq_pvs(saw_name, "CHECK") \|\|
	239	sv_eq_pvs(saw_name, "UNITCHECK")
	240	) {
	241	builtin_attrs \|= MY_ATTR_SPECIAL;
	242	}
	243
db81d362	244	lex_read_to(s + len);
db81d362	245	lex_read_space(0);
db81d362	246	} else if (spec->name == FLAG_NAME_REQUIRED) {
	247	croak("I was expecting a function name, not \"%.*s\"", (int)(PL_parser->bufend - s), s);
	248	} else {
	249	sv_catpvs(declarator, " (anon)");
	250	}
	251
c311cef3	252	floor_ix = start_subparse(FALSE, saw_name ? 0 : CVf_ANON);
	253	SAVEFREESV(PL_compcv);
	254
db81d362	255	/* parameters */
c311cef3	256	params = NULL;
db81d362	257	c = lex_peek_unichar(0);
	258	if (c == '(') {
	259	SV *saw_slurpy = NULL;
	260
	261	lex_read_unichar(0);
	262	lex_read_space(0);
	263
c311cef3	264	params = newAV();
	265	sv_2mortal((SV *)params);
	266
db81d362	267	for (;;) {
db81d362	268	c = lex_peek_unichar(0);
f5cc9bdd	269	if (c == '$' \|\| c == '@' \|\| c == '%') {
c311cef3	270	SV *param;
c311cef3	271
db81d362	272	lex_read_unichar(0);
	273	lex_read_space(0);
	274
	275	s = PL_parser->bufptr;
7dd35535	276	if (!(len = S_scan_word(aTHX_ s, FALSE))) {
85bc3fbd	277	croak("In %"SVf": missing identifier", SVfARG(declarator));
db81d362	278	}
c311cef3	279	param = sv_2mortal(newSVpvf("%c%.*s", (int)c, (int)len, s));
db81d362	280	if (saw_slurpy) {
c311cef3	281	croak("In %"SVf": I was expecting \")\" after \"%"SVf"\", not \"%"SVf"\"", SVfARG(declarator), SVfARG(saw_slurpy), SVfARG(param));
db81d362	282	}
db81d362	283	if (c != '$') {
c311cef3	284	saw_slurpy = param;
db81d362	285	}
c311cef3	286	av_push(params, SvREFCNT_inc_simple_NN(param));
db81d362	287	lex_read_to(s + len);
	288	lex_read_space(0);
	289
	290	c = lex_peek_unichar(0);
	291	if (c == ',') {
	292	lex_read_unichar(0);
	293	lex_read_space(0);
	294	continue;
	295	}
	296	}
	297
	298	if (c == ')') {
	299	lex_read_unichar(0);
	300	lex_read_space(0);
	301	break;
	302	}
	303
	304	if (c == -1) {
85bc3fbd	305	croak("In %"SVf": unexpected EOF in parameter list", SVfARG(declarator));
db81d362	306	}
85bc3fbd	307	croak("In %"SVf": unexpected '%c' in parameter list", SVfARG(declarator), (int)c);
db81d362	308	}
	309	}
	310
	311	/* prototype */
c311cef3	312	proto = NULL;
db81d362	313	saw_colon = 0;
	314	c = lex_peek_unichar(0);
	315	if (c == ':') {
	316	lex_read_unichar(0);
	317	lex_read_space(0);
	318
	319	c = lex_peek_unichar(0);
	320	if (c != '(') {
c311cef3	321	lex_stuff_pvs(":", 0);
c311cef3	322	c = ':';
db81d362	323	} else {
c311cef3	324	proto = sv_2mortal(newSVpvs(""));
c311cef3	325	if (!S_scan_str(aTHX_ proto, FALSE, FALSE)) {
f34187b8	326	croak("In %"SVf": prototype not terminated", SVfARG(declarator));
db81d362	327	}
311ced6f	328	S_check_prototype(aTHX_ declarator, proto);
db81d362	329	lex_read_space(0);
c311cef3	330	c = lex_peek_unichar(0);
db81d362	331	}
	332	}
	333
c311cef3	334	/* surprise predeclaration! */
db81d362	335	if (saw_name) {
c311cef3	336	/* 'sub NAME (PROTO);' to make name/proto known to perl before it
	337	starts parsing the body */
	338	SvREFCNT_inc_simple_void(PL_compcv);
	339
	340	newATTRSUB(
	341	floor_ix,
	342	newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(saw_name)),
	343	proto ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(proto)) : NULL,
	344	NULL,
	345	NULL
	346	);
	347
	348	floor_ix = start_subparse(FALSE, 0);
	349	SAVEFREESV(PL_compcv);
db81d362	350	}
db81d362	351
c311cef3	352
db81d362	353	/* attributes */
c311cef3	354	Newx(attrs_sentinel, 1, OP *);
c311cef3	355	*attrs_sentinel = NULL;
311ced6f	356	SAVEDESTRUCTOR_X(free_ptr_op, attrs_sentinel);
c311cef3	357
	358	if (c == ':' \|\| c == '{') {
	359
	360	/* kludge default attributes in */
	361	if (SvTRUE(spec->attrs) && SvPV_nolen(spec->attrs)[0] == ':') {
	362	lex_stuff_sv(spec->attrs, 0);
	363	c = ':';
	364	}
b72eb6ee	365
db81d362	366	if (c == ':') {
db81d362	367	lex_read_unichar(0);
db81d362	368	lex_read_space(0);
db81d362	369	c = lex_peek_unichar(0);
c311cef3	370
	371	for (;;) {
	372	SV *attr;
	373
	374	s = PL_parser->bufptr;
	375	if (!(len = S_scan_word(aTHX_ s, FALSE))) {
	376	break;
db81d362	377	}
c311cef3	378
	379	attr = sv_2mortal(newSVpvn_flags(s, len, PARSING_UTF ? SVf_UTF8 : 0));
	380
	381	lex_read_to(s + len);
db81d362	382	lex_read_space(0);
db81d362	383	c = lex_peek_unichar(0);
c311cef3	384
	385	if (c != '(') {
	386	if (sv_eq_pvs(attr, "lvalue")) {
	387	builtin_attrs \|= MY_ATTR_LVALUE;
	388	attr = NULL;
	389	} else if (sv_eq_pvs(attr, "method")) {
	390	builtin_attrs \|= MY_ATTR_METHOD;
	391	attr = NULL;
	392	}
	393	} else {
	394	SV *sv = sv_2mortal(newSVpvs(""));
	395	if (!S_scan_str(aTHX_ sv, TRUE, TRUE)) {
	396	croak("In %"SVf": unterminated attribute parameter in attribute list", SVfARG(declarator));
	397	}
	398	sv_catsv(attr, sv);
	399
	400	lex_read_space(0);
	401	c = lex_peek_unichar(0);
	402	}
	403
	404	if (attr) {
	405	attrs_sentinel = op_append_elem(OP_LIST, attrs_sentinel, newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(attr)));
	406	}
	407
	408	if (c == ':') {
	409	lex_read_unichar(0);
	410	lex_read_space(0);
	411	c = lex_peek_unichar(0);
	412	}
db81d362	413	}
	414	}
	415	}
	416
	417	/* body */
db81d362	418	if (c != '{') {
85bc3fbd	419	croak("In %"SVf": I was expecting a function body, not \"%c\"", SVfARG(declarator), (int)c);
db81d362	420	}
c311cef3	421
	422	if (builtin_attrs & MY_ATTR_LVALUE) {
	423	CvLVALUE_on(PL_compcv);
db81d362	424	}
c311cef3	425	if (builtin_attrs & MY_ATTR_METHOD) {
	426	CvMETHOD_on(PL_compcv);
	427	}
	428	if (builtin_attrs & MY_ATTR_SPECIAL) {
	429	CvSPECIAL_on(PL_compcv);
db81d362	430	}
db81d362	431
c311cef3	432	/* munge */
	433	{
	434	/* create outer block: '{' */
311ced6f	435	const int save_ix = S_block_start(aTHX_ TRUE);
c311cef3	436	OP *init = NULL;
	437
	438	/* my $self = shift; */
	439	if (SvTRUE(spec->shift)) {
	440	OP *const var = newOP(OP_PADSV, OPf_WANT_SCALAR \| (OPpLVAL_INTRO << 8));
	441	var->op_targ = pad_add_name_sv(spec->shift, 0, NULL, NULL);
	442
	443	init = newASSIGNOP(OPf_STACKED, var, 0, newOP(OP_SHIFT, 0));
	444	init = newSTATEOP(0, NULL, init);
	445	}
	446
	447	/* my (PARAMS) = @_; */
	448	if (params && av_len(params) > -1) {
	449	SV *param;
	450	OP init_param, left, *right;
	451
	452	left = NULL;
	453	while ((param = av_shift(params)) != &PL_sv_undef) {
	454	OP *const var = newOP(OP_PADSV, OPf_WANT_LIST \| (OPpLVAL_INTRO << 8));
	455	var->op_targ = pad_add_name_sv(param, 0, NULL, NULL);
	456	SvREFCNT_dec(param);
	457	left = op_append_elem(OP_LIST, left, var);
	458	}
	459
	460	left->op_flags \|= OPf_PARENS;
	461	right = newAVREF(newGVOP(OP_GV, 0, PL_defgv));
	462	init_param = newASSIGNOP(OPf_STACKED, left, 0, right);
	463	init_param = newSTATEOP(0, NULL, init_param);
	464
	465	init = op_append_list(OP_LINESEQ, init, init_param);
	466	}
	467
	468	/* add '();' to make function return nothing by default */
	469	/* (otherwise the invisible parameter initialization can "leak" into
	470	the return value: fun ($x) {}->("asdf", 0) == 2) */
	471	if (init) {
	472	init = op_append_list(OP_LINESEQ, init, newSTATEOP(0, NULL, newOP(OP_STUB, OPf_PARENS)));
	473	}
	474
	475	/* finally let perl parse the actual subroutine body */
	476	body = parse_block(0);
	477
	478	body = op_append_list(OP_LINESEQ, init, body);
	479
	480	/* close outer block: '}' */
311ced6f	481	S_block_end(aTHX_ save_ix, body);
db81d362	482	}
db81d362	483
c311cef3	484	/* it's go time. */
	485	{
	486	OP const attrs = attrs_sentinel;
	487	*attrs_sentinel = NULL;
	488	SvREFCNT_inc_simple_void(PL_compcv);
	489
	490	if (!saw_name) {
	491	*pop = newANONATTRSUB(
	492	floor_ix,
	493	proto ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(proto)) : NULL,
	494	attrs,
	495	body
	496	);
	497	return KEYWORD_PLUGIN_EXPR;
	498	}
	499
	500	newATTRSUB(
	501	floor_ix,
	502	newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(saw_name)),
	503	proto ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(proto)) : NULL,
	504	attrs,
	505	body
	506	);
	507	*pop = NULL;
	508	return KEYWORD_PLUGIN_STMT;
db81d362	509	}
db81d362	510	}
	511
	512	static int my_keyword_plugin(pTHX_ char keyword_ptr, STRLEN keyword_len, OP *op_ptr) {
	513	Spec spec;
	514	int ret;
	515
	516	SAVETMPS;
	517
7dd35535	518	if (kw_flags(aTHX_ keyword_ptr, keyword_len, &spec)) {
7dd35535	519	ret = parse_fun(aTHX_ op_ptr, keyword_ptr, keyword_len, &spec);
db81d362	520	} else {
7dd35535	521	ret = next_keyword_plugin(aTHX_ keyword_ptr, keyword_len, op_ptr);
db81d362	522	}
	523
	524	FREETMPS;
	525
	526	return ret;
	527	}
	528
	529	WARNINGS_RESET
	530
	531	MODULE = Function::Parameters PACKAGE = Function::Parameters
	532	PROTOTYPES: ENABLE
	533
	534	BOOT:
	535	WARNINGS_ENABLE {
	536	HV *const stash = gv_stashpvs(MY_PKG, GV_ADD);
426a4d69	537	/**/
db81d362	538	newCONSTSUB(stash, "FLAG_NAME_OPTIONAL", newSViv(FLAG_NAME_OPTIONAL));
	539	newCONSTSUB(stash, "FLAG_NAME_REQUIRED", newSViv(FLAG_NAME_REQUIRED));
	540	newCONSTSUB(stash, "FLAG_NAME_PROHIBITED", newSViv(FLAG_NAME_PROHIBITED));
	541	newCONSTSUB(stash, "HINTK_KEYWORDS", newSVpvs(HINTK_KEYWORDS));
	542	newCONSTSUB(stash, "HINTK_NAME_", newSVpvs(HINTK_NAME_));
	543	newCONSTSUB(stash, "HINTK_SHIFT_", newSVpvs(HINTK_SHIFT_));
b72eb6ee	544	newCONSTSUB(stash, "HINTK_ATTRS_", newSVpvs(HINTK_ATTRS_));
426a4d69	545	/**/
db81d362	546	next_keyword_plugin = PL_keyword_plugin;
	547	PL_keyword_plugin = my_keyword_plugin;
	548	} WARNINGS_RESET