/
mop.xs
1685 lines (1396 loc) · 45.3 KB
/
mop.xs
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#include "EXTERN.h"
#include "perl.h"
#define NO_XSLOCKS
#include "XSUB.h"
#include "callparser1.h"
/* subname magic {{{ */
static MGVTBL subname_vtbl;
/* }}} */
/* attribute magic {{{ */
static int
mg_attr_get(pTHX_ SV *sv, MAGIC *mg)
{
dSP;
SV *name, *meta, *self, *attr, *val;
name = *av_fetch((AV *)mg->mg_obj, 0, 0);
meta = *av_fetch((AV *)mg->mg_obj, 1, 0);
self = *av_fetch((AV *)mg->mg_obj, 2, 0);
ENTER;
PUSHMARK(SP);
XPUSHs(meta);
XPUSHs(name);
PUTBACK;
call_method("get_attribute", G_SCALAR);
SPAGAIN;
attr = POPs;
PUTBACK;
LEAVE;
ENTER;
PUSHMARK(SP);
XPUSHs(attr);
XPUSHs(self);
PUTBACK;
call_method("fetch_data_in_slot_for", G_SCALAR);
SPAGAIN;
val = POPs;
PUTBACK;
LEAVE;
sv_setsv(sv, val);
return 0;
}
static int
mg_attr_set(pTHX_ SV *sv, MAGIC *mg)
{
dSP;
SV *name, *meta, *self, *attr;
name = *av_fetch((AV *)mg->mg_obj, 0, 0);
meta = *av_fetch((AV *)mg->mg_obj, 1, 0);
self = *av_fetch((AV *)mg->mg_obj, 2, 0);
ENTER;
PUSHMARK(SP);
XPUSHs(meta);
XPUSHs(name);
PUTBACK;
call_method("get_attribute", G_SCALAR);
SPAGAIN;
attr = POPs;
PUTBACK;
LEAVE;
ENTER;
PUSHMARK(SP);
XPUSHs(attr);
XPUSHs(self);
XPUSHs(sv);
PUTBACK;
call_method("store_data_in_slot_for", G_VOID);
LEAVE;
return 0;
}
static int
mg_err_get(pTHX_ SV *sv, MAGIC *mg)
{
PERL_UNUSED_ARG(sv);
croak("Cannot access the attribute:(%"SVf") in a method "
"without a blessed invocant", SVfARG(mg->mg_obj));
}
static int
mg_err_set(pTHX_ SV *sv, MAGIC *mg)
{
PERL_UNUSED_ARG(sv);
croak("Cannot assign to the attribute:(%"SVf") in a method "
"without a blessed invocant", SVfARG(mg->mg_obj));
}
static MGVTBL attr_vtbl = {
mg_attr_get, /* get */
mg_attr_set, /* set */
0, /* len */
0, /* clear */
0, /* free */
0, /* copy */
0, /* dup */
0, /* local */
};
static MGVTBL err_vtbl = {
mg_err_get, /* get */
mg_err_set, /* set */
0, /* len */
0, /* clear */
0, /* free */
0, /* copy */
0, /* dup */
0, /* local */
};
#define set_attr_magic(var, name, meta, self) THX_set_attr_magic(aTHX_ var, name, meta, self)
static void
THX_set_attr_magic(pTHX_ SV *var, SV *name, SV *meta, SV *self)
{
SV *svs[3];
AV *data;
svs[0] = name;
svs[1] = meta;
svs[2] = self;
data = (AV *)sv_2mortal((SV *)av_make(3, svs));
sv_magicext(var, (SV *)data, PERL_MAGIC_ext, &attr_vtbl, "attr", 0);
}
#define set_err_magic(var, name) THX_set_err_magic(aTHX_ var, name)
static void
THX_set_err_magic(pTHX_ SV *var, SV *name)
{
sv_magicext(var, name, PERL_MAGIC_ext, &err_vtbl, "err", 0);
}
/* }}} */
/* stash magic {{{ */
static MGVTBL meta_vtbl;
#define get_meta(name) THX_get_meta(aTHX_ name)
static SV *
THX_get_meta(pTHX_ SV *name)
{
MAGIC *mg = NULL;
HV *stash;
stash = gv_stashsv(name, 0);
if (stash) {
mg = mg_findext((SV *)stash, PERL_MAGIC_ext, &meta_vtbl);
}
return mg ? mg->mg_obj : &PL_sv_undef;
}
#define set_meta(name, meta) THX_set_meta(aTHX_ name, meta)
static void
THX_set_meta(pTHX_ SV *name, SV *meta)
{
HV *stash;
stash = gv_stashsv(name, GV_ADD);
sv_magicext((SV *)stash, meta, PERL_MAGIC_ext, &meta_vtbl, "meta", 0);
}
#define unset_meta(name) THX_unset_meta(aTHX_ name)
static void
THX_unset_meta(pTHX_ SV *name)
{
HV *stash;
stash = gv_stashsv(name, GV_ADD);
sv_unmagicext((SV *)stash, PERL_MAGIC_ext, &meta_vtbl);
}
/* }}} */
/* version helpers {{{ */
/* modified from prescan_version in core. prescan_version assumes that the
* characters following a version number will be either ; or {, which isn't
* true for us. */
#define peek_version(s, errstr) THX_peek_version(aTHX_ s, errstr)
STRLEN
THX_peek_version(pTHX_ const char *s, const char **errstr)
{
const char *d = s;
if (*d == 'v') { /* explicit v-string */
d++;
if (!isDIGIT(*d)) { /* degenerate v-string */
return 0;
}
if (d[0] == '0' && isDIGIT(d[1])) {
/* no leading zeros allowed */
BADVERSION(0,errstr,"Invalid version format (no leading zeros)");
}
while (isDIGIT(*d)) /* integer part */
d++;
if (*d == '.')
{
d++; /* decimal point */
}
else
{
/* require v1.2.3 */
BADVERSION(0,errstr,"Invalid version format (dotted-decimal versions require at least three parts)");
}
{
int i = 0;
int j = 0;
while (isDIGIT(*d)) { /* just keep reading */
i++;
while (isDIGIT(*d)) {
d++; j++;
/* maximum 3 digits between decimal */
if (j > 3) {
BADVERSION(0,errstr,"Invalid version format (maximum 3 digits between decimals)");
}
}
if (*d == '_') {
BADVERSION(0,errstr,"Invalid version format (no underscores)");
}
else if (*d == '.') {
d++;
}
else if (!isDIGIT(*d)) {
break;
}
j = 0;
}
if (i < 2) {
/* requires v1.2.3 */
BADVERSION(0,errstr,"Invalid version format (dotted-decimal versions require at least three parts)");
}
}
} /* end if dotted-decimal */
else
{ /* decimal versions */
if (*d == '.') {
BADVERSION(0,errstr,"Invalid version format (0 before decimal required)");
}
if (*d == '0' && isDIGIT(d[1])) {
BADVERSION(0,errstr,"Invalid version format (no leading zeros)");
}
/* and we never support negative versions */
if ( *d == '-') {
BADVERSION(0,errstr,"Invalid version format (negative version number)");
}
/* consume all of the integer part */
while (isDIGIT(*d))
d++;
/* look for a fractional part */
if (*d == '.') {
/* we found it, so consume it */
d++;
}
else if (!*d || isSPACE(*d)) {
/* found just an integer (or nothing) */
return d - s;
}
else if ( d == s ) {
/* didn't find either integer or period */
return 0;
}
else if (*d == '_') {
/* underscore can't come after integer part */
BADVERSION(0,errstr,"Invalid version format (no underscores)");
}
else {
/* anything else after integer part is just invalid data */
BADVERSION(0,errstr,"Invalid version format (non-numeric data)");
}
/* scan the fractional part after the decimal point*/
if (!isDIGIT(*d)) {
BADVERSION(0,errstr,"Invalid version format (fractional part required)");
}
while (isDIGIT(*d)) {
d++;
if (*d == '.' && isDIGIT(d[-1])) {
BADVERSION(0,errstr,"Invalid version format (dotted-decimal versions must begin with 'v')");
}
if (*d == '_') {
BADVERSION(0,errstr,"Invalid version format (no underscores)");
}
}
}
return d - s;
}
static SV *
parse_version(const char *buf, STRLEN len)
{
dSP;
SV *v;
ENTER;
PUSHMARK(SP);
XPUSHs(sv_2mortal(newSVpvs("version")));
XPUSHs(sv_2mortal(newSVpvn(buf, len)));
PUTBACK;
call_method("parse", G_SCALAR);
SPAGAIN;
v = POPs;
PUTBACK;
LEAVE;
return v;
}
/* }}} */
/* lexer helpers {{{ */
#ifndef OFFUNISKIP
#if UVSIZE >= 8
# define UTF8_QUAD_MAX UINT64_C(0x1000000000)
/* Input is a true Unicode (not-native) code point */
#define OFFUNISKIP(uv) ( (uv) < 0x80 ? 1 : \
(uv) < 0x800 ? 2 : \
(uv) < 0x10000 ? 3 : \
(uv) < 0x200000 ? 4 : \
(uv) < 0x4000000 ? 5 : \
(uv) < 0x80000000 ? 6 : \
(uv) < UTF8_QUAD_MAX ? 7 : 13 )
#else
/* No, I'm not even going to *TRY* putting #ifdef inside a #define */
#define OFFUNISKIP(uv) ( (uv) < 0x80 ? 1 : \
(uv) < 0x800 ? 2 : \
(uv) < 0x10000 ? 3 : \
(uv) < 0x200000 ? 4 : \
(uv) < 0x4000000 ? 5 : \
(uv) < 0x80000000 ? 6 : 7 )
#endif
#endif
#ifndef isIDCONT_uni
inline bool is_uni_idcont(pTHX_ UV c) {
U8 tmpbuf[UTF8_MAXBYTES+1];
uvchr_to_utf8(tmpbuf, c);
return is_utf8_idcont(tmpbuf);
}
#define isIDCONT_uni(uv) is_uni_idcont(aTHX_ uv)
#endif
#ifndef isIDCONT_A
/* not ideal, but it's just for backcompat anyway */
#define isIDCONT_A(uv) isIDCONT_uni(uv)
#endif
#define lex_peek_sv(len) THX_lex_peek_sv(aTHX_ len)
static SV *
THX_lex_peek_sv(pTHX_ STRLEN len)
{
char *bufptr = PL_parser->bufptr;
char *bufend = PL_parser->bufend;
STRLEN got;
/* XXX before 5.19.2, lex_next_chunk when we aren't at the end of a line
* just breaks things entirely (the parser no longer sees the text that is
* read in). this is (i think inadvertently) fixed in 5.19.2 (21791330a),
* but it still screws up the line numbers of everything that follows. so,
* the workaround is just to not call lex_next_chunk unless we're at the
* end of a line. this is a bit limiting, but should rarely come up in
* practice.
*/
/*
while (PL_parser->bufend - PL_parser->bufptr < len) {
if (!lex_next_chunk(0)) {
break;
}
}
*/
if (bufptr == bufend) {
lex_next_chunk(0);
bufptr = PL_parser->bufptr;
bufend = PL_parser->bufend;
}
if (lex_bufutf8()) {
char *end = bufptr;
STRLEN i;
for (i = 0; i < len; ++i) {
unsigned char skip = UTF8SKIP(end);
if (end - bufptr + skip > bufend - bufptr)
break;
end += UTF8SKIP(end);
}
return sv_2mortal(newSVpvn_utf8(bufptr, end - bufptr, TRUE));
}
else {
got = bufend - bufptr;
if (got < len)
len = got;
return sv_2mortal(newSVpvn(bufptr, len));
}
}
#define read_tokenish() THX_read_tokenish(aTHX)
static SV *
THX_read_tokenish(pTHX)
{
char c;
SV *ret = sv_2mortal(newSV(1));
SvCUR_set(ret, 0);
SvPOK_on(ret);
if (strchr("$@%!:", lex_peek_unichar(LEX_KEEP_PREVIOUS)) != NULL)
sv_catpvf(ret, "%c", lex_read_unichar(LEX_KEEP_PREVIOUS));
c = lex_peek_unichar(LEX_KEEP_PREVIOUS);
while (c != -1 && !isSPACE(c)) {
sv_catpvf(ret, "%c", lex_read_unichar(LEX_KEEP_PREVIOUS));
c = lex_peek_unichar(LEX_KEEP_PREVIOUS);
}
return ret;
}
#define PARSE_NAME_ALLOW_PACKAGE 1
#define parse_name_prefix(prefix, prefixlen, what, whatlen, flags) THX_parse_name_prefix(aTHX_ prefix, prefixlen, what, whatlen, flags)
static SV *
THX_parse_name_prefix(pTHX_ const char *prefix, STRLEN prefixlen,
const char *what, STRLEN whatlen, U32 flags)
{
STRLEN len = 0;
SV *sv;
bool in_fqname = FALSE;
if (flags & ~PARSE_NAME_ALLOW_PACKAGE)
croak("unknown flags");
for (;;) {
UV c;
/* XXX why does lex_peek_unichar return an I32? */
c = (UV)lex_peek_unichar(LEX_KEEP_PREVIOUS);
if (lex_bufutf8()) {
if (in_fqname ? isIDCONT_uni(c) : isIDFIRST_uni(c)) {
do {
len += OFFUNISKIP(c);
lex_read_unichar(LEX_KEEP_PREVIOUS);
c = (UV)lex_peek_unichar(LEX_KEEP_PREVIOUS);
} while (isIDCONT_uni(c));
}
}
else {
if (in_fqname ? isIDCONT_A((U8)c) : isIDFIRST_A((U8)c)) {
do {
++len;
lex_read_unichar(LEX_KEEP_PREVIOUS);
c = (UV)lex_peek_unichar(LEX_KEEP_PREVIOUS);
} while (isIDCONT_A((U8)c));
}
}
if ((flags & PARSE_NAME_ALLOW_PACKAGE) && c == ':') {
in_fqname = TRUE;
++len;
lex_read_unichar(LEX_KEEP_PREVIOUS);
c = (UV)lex_peek_unichar(LEX_KEEP_PREVIOUS);
if (c == ':') {
++len;
lex_read_unichar(LEX_KEEP_PREVIOUS);
c = (UV)lex_peek_unichar(LEX_KEEP_PREVIOUS);
}
else {
SV *buf;
buf = newSVpvn(PL_parser->bufptr - len, len);
croak("Invalid identifier: %"SVf"%"SVf,
SVfARG(buf),
SVfARG(read_tokenish()));
}
}
else
break;
}
if (!len)
croak("%"SVf" is not a valid %.*s name",
SVfARG(read_tokenish()), whatlen, what);
sv = sv_2mortal(newSV(prefixlen + len));
Copy(prefix, SvPVX(sv), prefixlen, char);
Copy(PL_parser->bufptr - len, SvPVX(sv) + prefixlen, len, char);
SvPVX(sv)[prefixlen + len] = '\0';
SvCUR_set(sv, prefixlen + len);
SvPOK_on(sv);
if (lex_bufutf8())
SvUTF8_on(sv);
return sv;
}
#define parse_name(what, whatlen, flags) THX_parse_name(aTHX_ what, whatlen, flags)
static SV *
THX_parse_name(pTHX_ const char *what, STRLEN whatlen, U32 flags)
{
return parse_name_prefix(NULL, 0, what, whatlen, flags);
}
/* }}} */
/* other helpers {{{ */
#define syntax_error(err) THX_syntax_error(aTHX_ err)
static void
THX_syntax_error(pTHX_ SV *err)
{
if (!SvOK(err))
err = ERRSV;
PL_parser->error_count++;
croak_sv(err);
}
#define current_meta_name() THX_current_meta_name(aTHX)
static SV *
THX_current_meta_name(pTHX)
{
dSP;
SV *ret;
ENTER;
PUSHMARK(SP);
XPUSHs(get_sv("mop::internals::syntax::CURRENT_META", 0));
PUTBACK;
call_method("name", G_SCALAR);
SPAGAIN;
ret = SvREFCNT_inc(POPs);
PUTBACK;
LEAVE;
return ret;
}
#define current_attributes() THX_current_attributes(aTHX)
static AV *
THX_current_attributes(pTHX)
{
dSP;
AV *ret;
int nret, i;
ENTER;
PUSHMARK(SP);
XPUSHs(get_sv("mop::internals::syntax::CURRENT_META", 0));
PUTBACK;
nret = call_method("attributes", G_ARRAY);
SPAGAIN;
ret = newAV();
av_extend(ret, nret);
for (i = 0; i < nret; ++i) {
SV *attr;
attr = POPs;
PUTBACK;
PUSHMARK(SP);
XPUSHs(attr);
PUTBACK;
call_method("name", G_SCALAR);
SPAGAIN;
av_push(ret, POPs);
PUTBACK;
}
LEAVE;
return ret;
}
#define load_classes(classes) THX_load_classes(aTHX_ classes)
static void
THX_load_classes(pTHX_ AV *classes)
{
int i;
for (i = 0; i <= av_len(classes); ++i) {
SV *name;
name = *av_fetch(classes, i, FALSE);
if (SvOK(get_meta(name)))
continue;
/* have to make a copy of name here, because load_module modifies it */
load_module(PERL_LOADMOD_NOIMPORT, newSVsv(name), NULL);
}
}
#define isa(sv, name) THX_isa(aTHX_ sv, name)
static bool
THX_isa(pTHX_ SV *sv, const char *name)
{
dSP;
SV *ret;
ENTER;
PUSHMARK(SP);
XPUSHs(sv);
XPUSHs(sv_2mortal(newSVpv(name, 0)));
PUTBACK;
call_method("isa", G_SCALAR);
SPAGAIN;
ret = POPs;
PUTBACK;
LEAVE;
return SvTRUE(ret);
}
/* }}} */
/* twigils {{{ */
static Perl_check_t old_rv2sv_checker;
static SV *twigils_hint_key_sv;
static U32 twigils_hint_key_hash;
#define intro_twigil_var(namesv) THX_intro_twigil_var(aTHX_ namesv)
static OP *
THX_intro_twigil_var(pTHX_ SV *namesv)
{
OP *o = newOP(OP_PADSV, (OPpLVAL_INTRO << 8) | OPf_MOD);
o->op_targ = pad_add_name_sv(namesv, 0, NULL, NULL);
return o;
}
#define parse_ident(prefix, prefixlen) THX_parse_ident(aTHX_ prefix, prefixlen)
static SV *
THX_parse_ident(pTHX_ const char *prefix, STRLEN prefixlen)
{
STRLEN idlen;
char *start, *s;
char c;
SV *sv;
start = s = PL_parser->bufptr;
if (start > SvPVX(PL_parser->linestr) && isSPACE(*(start - 1)))
return NULL;
c = *s;
if (!isIDFIRST(c))
return NULL;
do {
c = *++s;
} while (isALNUM(c));
lex_read_to(s);
idlen = s - start;
sv = sv_2mortal(newSV(prefixlen + idlen));
Copy(prefix, SvPVX(sv), prefixlen, char);
Copy(start, SvPVX(sv) + prefixlen, idlen, char);
SvPVX(sv)[prefixlen + idlen] = 0;
SvCUR_set(sv, prefixlen + idlen);
SvPOK_on(sv);
return sv;
}
#define twigil_enabled() THX_twigil_enabled(aTHX)
static bool
THX_twigil_enabled(pTHX)
{
HE *he = hv_fetch_ent(GvHV(PL_hintgv), twigils_hint_key_sv, 0, twigils_hint_key_hash);
return he && SvTRUE(HeVAL(he));
}
static OP *
myck_rv2sv_twigils(pTHX_ OP *o)
{
OP *kid, *ret;
SV *sv, *name;
PADOFFSET offset;
char prefix[2];
if (!(o->op_flags & OPf_KIDS))
return old_rv2sv_checker(aTHX_ o);
kid = cUNOPo->op_first;
if (kid->op_type != OP_CONST)
return old_rv2sv_checker(aTHX_ o);
sv = cSVOPx_sv(kid);
if (!SvPOK(sv))
return old_rv2sv_checker(aTHX_ o);
if (!twigil_enabled())
return old_rv2sv_checker(aTHX_ o);
if (*SvPVX(sv) != '!')
return old_rv2sv_checker(aTHX_ o);
prefix[0] = '$';
prefix[1] = *SvPVX(sv);
name = parse_ident(prefix, 2);
if (!name)
return old_rv2sv_checker(aTHX_ o);
offset = pad_findmy_sv(name, 0);
if (offset == NOT_IN_PAD)
croak("No such twigil variable %"SVf, SVfARG(name));
ret = newOP(OP_PADSV, 0);
ret->op_targ = offset;
op_free(o);
return ret;
}
/* }}} */
/* keyword modifier parsing {{{ */
#define parse_modifier(modifier, len) THX_parse_modifier(aTHX_ modifier, len)
static bool
THX_parse_modifier(pTHX_ const char *modifier, STRLEN len)
{
STRLEN got;
char *s = SvPV(lex_peek_sv(len + 1), got);
if (got < len)
return FALSE;
if (strnNE(s, modifier, len))
return FALSE;
if (got >= len + 1) {
char last = s[len];
if (isALNUM(last) || last == '_')
return FALSE;
}
lex_read_to(PL_parser->bufptr + len);
return TRUE;
}
#define parse_modifier_with_single_value(modifier, len) THX_parse_modifier_with_single_value(aTHX_ modifier, len)
static SV *
THX_parse_modifier_with_single_value(pTHX_ const char *modifier, STRLEN len)
{
if (!parse_modifier(modifier, len))
return NULL;
lex_read_space(0);
if (strnEQ(modifier, "extends", len))
return parse_name("class", sizeof("class") - 1, PARSE_NAME_ALLOW_PACKAGE);
return parse_name(modifier, len, PARSE_NAME_ALLOW_PACKAGE);
}
#define parse_modifier_with_multiple_values(modifier, len) THX_parse_modifier_with_multiple_values(aTHX_ modifier, len)
static AV *
THX_parse_modifier_with_multiple_values(pTHX_ const char *modifier, STRLEN len)
{
AV *ret = (AV *)sv_2mortal((SV *)newAV());
if (!parse_modifier(modifier, len))
return ret;
lex_read_space(0);
do {
SV *name = parse_name("role", sizeof("role"), PARSE_NAME_ALLOW_PACKAGE);
av_push(ret, SvREFCNT_inc(name));
lex_read_space(0);
} while (lex_peek_unichar(0) == ',' && (lex_read_unichar(0), lex_read_space(0), TRUE));
return ret;
}
/* }}} */
/* trait parsing {{{ */
struct mop_trait {
SV *name;
OP *params;
};
#define parse_traits(ntraitsp) THX_parse_traits(aTHX_ ntraitsp)
static struct mop_trait **
THX_parse_traits(pTHX_ UV *ntraitsp)
{
dXCPT;
U32 ntraits = 0;
struct mop_trait **ret = NULL;
if (!parse_modifier("is", 2)) {
*ntraitsp = 0;
return ret;
}
lex_read_space(0);
XCPT_TRY_START {
do {
struct mop_trait *trait;
Renew(ret, ntraits + 1, struct mop_trait *);
Newx(trait, 1, struct mop_trait);
ret[ntraits] = trait;
trait->name = parse_name("trait", sizeof("trait") - 1,
PARSE_NAME_ALLOW_PACKAGE);
if (lex_peek_unichar(0) == '(') {
lex_read_unichar(0);
trait->params = newANONLIST(parse_fullexpr(0));
if (lex_peek_unichar(0) != ')')
syntax_error(sv_2mortal(newSVpvf("Unterminated parameter "
"list for trait %"SVf,
SVfARG(trait->name))));
lex_read_unichar(0);
}
else
trait->params = NULL;
ntraits++;
} while (lex_peek_unichar(0) == ',' && (lex_read_unichar(0),
lex_read_space(0), TRUE));
} XCPT_TRY_END XCPT_CATCH {
UV i;
for (i = 0; i < ntraits; i++) {
/* name is already mortal */
if (ret[i]->params)
op_free(ret[i]->params);
Safefree(ret[i]);
Safefree(ret);
}
XCPT_RETHROW;
}
*ntraitsp = ntraits;
return ret;
}
#define gen_traits_ops(append_to, traits, ntraits) THX_gen_traits_ops(aTHX_ append_to, traits, ntraits)
static OP *
THX_gen_traits_ops(pTHX_ OP *append_to, struct mop_trait **traits, UV ntraits)
{
UV i;
for (i = 0; i < ntraits; i++) {
OP *cvop = newUNOP(OP_REFGEN, 0,
newCVREF((OPpENTERSUB_AMPER<<8),
newSVOP(OP_CONST, 0, SvREFCNT_inc(traits[i]->name))));
append_to = op_append_elem(OP_LIST, append_to, cvop);
append_to = op_append_elem(OP_LIST, append_to,
traits[i]->params
? traits[i]->params
: newSVOP(OP_CONST, 0, &PL_sv_undef));
Safefree(traits[i]);
}
Safefree(traits);
return append_to;
}
/* }}} */
/* attribute parsing {{{ */
#define parse_has() THX_parse_has(aTHX)
static OP *
THX_parse_has(pTHX)
{
SV *name;
UV ntraits;
OP *default_value = NULL, *ret;
struct mop_trait **traits;
lex_read_space(0);
if (lex_peek_unichar(0) != '$')
syntax_error(sv_2mortal(newSVpvf("Invalid attribute name %"SVf,
SVfARG(read_tokenish()))));
lex_read_unichar(0);
if (lex_peek_unichar(0) != '!')
syntax_error(sv_2mortal(newSVpvf("Invalid attribute name $%"SVf,
SVfARG(read_tokenish()))));
lex_read_unichar(0);
name = parse_name_prefix("$!", 2, "attribute", sizeof("attribute") - 1, 0);
lex_read_space(0);
traits = parse_traits(&ntraits);
lex_read_space(0);
if (lex_peek_unichar(0) == '=') {
I32 floor;
OP *default_op;
lex_read_unichar(0);
lex_read_space(0);
floor = start_subparse(0, CVf_ANON);
default_op = parse_fullexpr(0);
if (default_op->op_type == OP_CONST) {
default_value = default_op;
LEAVE_SCOPE(floor);
}
else {
default_value = newANONSUB(floor, NULL, default_op);
}
lex_read_space(0);
}
if (lex_peek_unichar(0) == ';')
lex_read_unichar(0);
else if (lex_peek_unichar(0) != '}')
syntax_error(sv_2mortal(newSVpvf("Couldn't parse attribute %"SVf,
SVfARG(name))));
ret = op_append_elem(OP_LIST, newSVOP(OP_CONST, 0, SvREFCNT_inc(name)),
default_value ? default_value : newSVOP(OP_CONST, 0, &PL_sv_undef));
ret = gen_traits_ops(ret, traits, ntraits);
return ret;
}
/* }}} */
/* method parsing {{{ */
struct mop_signature_var {
SV *name;
OP *default_value;
};
#define parse_signature(method_name, invocantp, varsp) THX_parse_signature(aTHX_ method_name, invocantp, varsp)
static UV
THX_parse_signature(pTHX_ SV *method_name,
struct mop_signature_var **invocantp,
struct mop_signature_var ***varsp)
{
dXCPT;
UV numvars = 0;
struct mop_signature_var **vars = NULL, *invocant = NULL;
if (lex_peek_unichar(0) == '(') {
char sigil;
bool seen_slurpy = FALSE;
lex_read_unichar(0);
lex_read_space(0);
XCPT_TRY_START {
while ((sigil = lex_peek_unichar(0)) != ')') {
struct mop_signature_var *var;
if (sigil != '$' && sigil != '@' && sigil != '%')
syntax_error(sv_2mortal(newSVpvf("Invalid sigil: %c", sigil)));
if (seen_slurpy)
syntax_error(sv_2mortal(newSVpvs("Can't declare parameters "
"after a slurpy parameter")));
seen_slurpy = sigil == '@' || sigil == '%';
lex_read_unichar(0);
lex_read_space(0);
Newxz(var, 1, struct mop_signature_var);
var->name = parse_name_prefix(&sigil, 1, "argument",
sizeof("argument") - 1, 0);
lex_read_space(0);
if (lex_peek_unichar(0) == '=') {
lex_read_unichar(0);
lex_read_space(0);
var->default_value = parse_arithexpr(0);
lex_read_space(0);
}
if (lex_peek_unichar(0) == ':') {
if (invocant)
syntax_error(sv_2mortal(newSVpvs("Cannot specify "