[gitmo/Mouse.git] / xs-src / MouseAccessor.xs

#include "mouse.h"

#define CHECK_INSTANCE(instance) STMT_START{                          \
        if(!(SvROK(instance) && SvTYPE(SvRV(instance)) == SVt_PVHV)){ \
            croak("Invalid object for instance managers");            \
        }                                                             \
    } STMT_END

/* Moose XS Attribute object */
enum mouse_xa_ix_t{
    MOUSE_XA_ATTRIBUTE,
    MOUSE_XA_TC,
    MOUSE_XA_TC_CODE,

    MOUSE_XA_last
};

#define MOUSE_xa_attribute(m) MOUSE_av_at(m, MOUSE_XA_ATTRIBUTE)
#define MOUSE_xa_tc(m)        MOUSE_av_at(m, MOUSE_XA_TC)
#define MOUSE_xa_tc_code(m)   MOUSE_av_at(m, MOUSE_XA_TC_CODE)

#define MOUSE_mg_attribute(mg) MOUSE_xa_attribute(MOUSE_mg_xa(mg))

enum mouse_xa_flags_t{
    MOUSEf_ATTR_HAS_TC          = 0x0001,
    MOUSEf_ATTR_HAS_DEFAULT     = 0x0002,
    MOUSEf_ATTR_HAS_BUILDER     = 0x0004,
    MOUSEf_ATTR_HAS_INITIALIZER = 0x0008, /* not used in Mouse */
    MOUSEf_ATTR_HAS_TRIGGER     = 0x0010,

    MOUSEf_ATTR_IS_LAZY         = 0x0020,
    MOUSEf_ATTR_IS_WEAK_REF     = 0x0040,
    MOUSEf_ATTR_IS_REQUIRED     = 0x0080,

    MOUSEf_ATTR_SHOULD_COERCE   = 0x0100,

    MOUSEf_ATTR_SHOULD_AUTO_DEREF
                                = 0x0200,
    MOUSEf_TC_IS_ARRAYREF       = 0x0400,
    MOUSEf_TC_IS_HASHREF        = 0x0800,

    MOUSEf_OTHER1               = 0x1000,
    MOUSEf_OTHER2               = 0x2000,
    MOUSEf_OTHER3               = 0x4000,
    MOUSEf_OTHER4               = 0x8000,

    MOUSEf_MOUSE_MASK           = 0xFFFF /* not used */
};

static MGVTBL mouse_accessor_vtbl; /* MAGIC identity */


SV*
mouse_accessor_get_self(pTHX_ I32 const ax, I32 const items, CV* const cv) {
    SV* self;

    if(items < 1){
        croak("Too few arguments for %s", GvNAME(CvGV(cv)));
    }

    /* NOTE: If self has GETMAGIC, $self->accessor will invoke GETMAGIC
     *       before calling methods, so SvGETMAGIC(self) is not necessarily needed here.
     */

    self = ST(0);
    if(!IsObject(self)){
        croak("Cant call %s as a class method", GvNAME(CvGV(cv)));
    }
    return self;
}


CV*
mouse_instantiate_xs_accessor(pTHX_ SV* const attr, XSUBADDR_t const accessor_impl){
    SV* const slot = mcall0(attr,  mouse_name);
    AV* const xa = newAV();
    CV* xsub;
    MAGIC* mg;
    U16 flags = 0;

    sv_2mortal((SV*)xa);

    xsub = newXS(NULL, accessor_impl, __FILE__);
    sv_2mortal((SV*)xsub);

    mg = sv_magicext((SV*)xsub, slot, PERL_MAGIC_ext, &mouse_accessor_vtbl, (char*)xa, HEf_SVKEY);

    /* NOTE:
     * although we use MAGIC for gc, we also store mg to CvXSUBANY for efficiency (gfx)
     */
    CvXSUBANY(xsub).any_ptr = (void*)mg;

    av_extend(xa, MOUSE_XA_last - 1);

    av_store(xa, MOUSE_XA_ATTRIBUTE, newSVsv(attr));

    /* prepare attribute status */
    /* XXX: making it lazy is a good way? */

    if(SvTRUEx(mcall0s(attr, "has_type_constraint"))){
        SV* tc;
        flags |= MOUSEf_ATTR_HAS_TC;

        ENTER;
        SAVETMPS;

        tc = mcall0s(attr, "type_constraint");
        av_store(xa, MOUSE_XA_TC, newSVsv(tc));

        if(SvTRUEx(mcall0s(attr, "should_auto_deref"))){
            flags |= MOUSEf_ATTR_SHOULD_AUTO_DEREF;
            if( SvTRUEx(mcall1s(tc, "is_a_type_of", newSVpvs_flags("ArrayRef", SVs_TEMP))) ){
                flags |= MOUSEf_TC_IS_ARRAYREF;
            }
            else if( SvTRUEx(mcall1s(tc, "is_a_type_of", newSVpvs_flags("HashRef", SVs_TEMP))) ){
                flags |= MOUSEf_TC_IS_HASHREF;
            }
            else{
                mouse_throw_error(attr, tc,
                    "Can not auto de-reference the type constraint '%"SVf"'",
                        mcall0(tc, mouse_name));
            }
        }

        if(SvTRUEx(mcall0s(attr, "should_coerce"))){
            flags |= MOUSEf_ATTR_SHOULD_COERCE;
        }

        FREETMPS;
        LEAVE;
    }

    if(SvTRUEx(mcall0s(attr, "has_trigger"))){
        flags |= MOUSEf_ATTR_HAS_TRIGGER;
    }

    if(SvTRUEx(mcall0s(attr, "is_lazy"))){
        flags |= MOUSEf_ATTR_IS_LAZY;

        if(SvTRUEx(mcall0s(attr, "has_builder"))){
            flags |= MOUSEf_ATTR_HAS_BUILDER;
        }
        else if(SvTRUEx(mcall0s(attr, "has_default"))){
            flags |= MOUSEf_ATTR_HAS_DEFAULT;
        }
    }

    if(SvTRUEx(mcall0s(attr, "is_weak_ref"))){
        flags |= MOUSEf_ATTR_IS_WEAK_REF;
    }

    if(SvTRUEx(mcall0s(attr, "is_required"))){
        flags |= MOUSEf_ATTR_IS_REQUIRED;
    }

    MOUSE_mg_flags(mg) = flags;

    return xsub;
}

static SV*
mouse_apply_type_constraint(pTHX_ AV* const xa, SV* value, U16 const flags){
    SV* const tc = MOUSE_xa_tc(xa);
    SV* tc_code;

    if(flags & MOUSEf_ATTR_SHOULD_COERCE){
          value = mcall1s(tc, "coerce", value);
    }

    if(!SvOK(MOUSE_xa_tc_code(xa))){
        XS(XS_Mouse__Util__TypeConstraints_Item); /* prototype defined in Mouse.xs */

        tc_code = mcall0s(tc, "_compiled_type_constraint");

        if(SvROK(tc_code) && SvTYPE(SvRV(tc_code))
            && CvXSUB((CV*)SvRV(tc_code)) == XS_Mouse__Util__TypeConstraints_Item){
            /* built-in type constraints */
            mouse_tc const id = CvXSUBANY((CV*)SvRV(tc_code)).any_i32;
            av_store(xa, MOUSE_XA_TC_CODE, newSViv(id));
        }
        else{
            av_store(xa, MOUSE_XA_TC_CODE, newSVsv(tc_code));
        }
    }
    else{
        tc_code = MOUSE_xa_tc_code(xa);
    }

    if(!mouse_tc_check(aTHX_ tc_code, value)){
        mouse_throw_error(MOUSE_xa_attribute(xa), value,
            "Attribute (%"SVf") does not pass the type constraint because: %"SVf,
                mcall0(MOUSE_xa_attribute(xa), mouse_name),
                mcall1s(tc, "get_message", value));
    }

    return value;
}

#define PUSH_VALUE(value, flags) STMT_START { \
        if((flags) & MOUSEf_ATTR_SHOULD_AUTO_DEREF && GIMME_V == G_ARRAY){ \
            mouse_push_values(aTHX_ value, (flags));                       \
        }                                                                  \
        else{                                                              \
            dSP;                                                           \
            XPUSHs(value ? value : &PL_sv_undef);                          \
            PUTBACK;                                                       \
        }                                                                  \
    } STMT_END                                                             \

/* pushes return values, does auto-deref if needed */
static void
mouse_push_values(pTHX_ SV* const value, U16 const flags){
    dSP;

    assert( flags & MOUSEf_ATTR_SHOULD_AUTO_DEREF && GIMME_V == G_ARRAY );

    if(!(value && SvOK(value))){
        return;
    }

    if(flags & MOUSEf_TC_IS_ARRAYREF){
        AV* const av = (AV*)SvRV(value);
        I32 len;
        I32 i;

        if(SvTYPE(av) != SVt_PVAV){
            croak("Mouse-panic: Not an ARRAY reference");
        }

        len = av_len(av) + 1;
        EXTEND(SP, len);
        for(i = 0; i < len; i++){
            SV** const svp = av_fetch(av, i, FALSE);
            PUSHs(svp ? *svp : &PL_sv_undef);
        }
    }
    else if(flags & MOUSEf_TC_IS_HASHREF){
        HV* const hv = (HV*)SvRV(value);
        HE* he;

        if(SvTYPE(hv) != SVt_PVHV){
            croak("Mouse-panic: Not a HASH reference");
        }

        hv_iterinit(hv);
        while((he = hv_iternext(hv))){
            EXTEND(SP, 2);
            PUSHs(hv_iterkeysv(he));
            PUSHs(hv_iterval(hv, he));
        }
    }

    PUTBACK;
}

static void
mouse_attr_get(pTHX_ SV* const self, MAGIC* const mg){
    U16 const flags = MOUSE_mg_flags(mg);
    SV* const slot  = MOUSE_mg_slot(mg);
    SV* value;

    value = mouse_instance_get_slot(aTHX_ self, slot);

    /* check_lazy */
    if( !value && flags & MOUSEf_ATTR_IS_LAZY ){
        AV* const xa    = MOUSE_mg_xa(mg);
        SV* const attr = MOUSE_xa_attribute(xa);

        /* get default value by $attr->default or $attr->builder */
        if(flags & MOUSEf_ATTR_HAS_DEFAULT){
            value = mcall0s(attr, "default");

            if(SvROK(value) && SvTYPE(SvRV(value)) == SVt_PVCV){
                value = mcall0(self, value);
            }
        }
        else if(flags & MOUSEf_ATTR_HAS_BUILDER){
            SV* const builder = mcall0s(attr, "builder");
            value = mcall0(self, builder);
        }

        if(!value){
            value = sv_newmortal();
        }

        /* apply coerce and type constraint */
        if(flags & MOUSEf_ATTR_HAS_TC){
            value = mouse_apply_type_constraint(aTHX_ xa, value, flags);
        }

        /* store value to slot */
        value = mouse_instance_set_slot(aTHX_ self, slot, value);
    }

    PUSH_VALUE(value, flags);
}

static void
mouse_attr_set(pTHX_ SV* const self, MAGIC* const mg, SV* value){
    U16 const flags = MOUSE_mg_flags(mg);
    SV* const slot  = MOUSE_mg_slot(mg);

    if(flags & MOUSEf_ATTR_HAS_TC){
        value = mouse_apply_type_constraint(aTHX_ MOUSE_mg_xa(mg), value, flags);
    }

    mouse_instance_set_slot(aTHX_ self, slot, value);

    if(flags & MOUSEf_ATTR_IS_WEAK_REF){
        mouse_instance_weaken_slot(aTHX_ self, slot);
    }

    if(flags & MOUSEf_ATTR_HAS_TRIGGER){
        SV* const trigger = mcall0s(MOUSE_mg_attribute(mg), "trigger");
        dSP;

        PUSHMARK(SP);
        EXTEND(SP, 2);
        PUSHs(self);
        PUSHs(value);

        PUTBACK;
        call_sv(trigger, G_VOID | G_DISCARD);
        /* need not SPAGAIN */
    }

    PUSH_VALUE(value, flags);
}

XS(mouse_xs_accessor)
{
    dVAR; dXSARGS;
    dMOUSE_self;
    MAGIC* const mg = (MAGIC*)XSANY.any_ptr;

    SP -= items; /* PPCODE */
    PUTBACK;

    if(items == 1){ /* reader */
        mouse_attr_get(aTHX_ self, mg);
    }
    else if (items == 2){ /* writer */
        mouse_attr_set(aTHX_ self, mg, ST(1));
    }
    else{
        mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
            "Expected exactly one or two argument for an accessor");
    }
}


XS(mouse_xs_reader)
{
    dVAR; dXSARGS;
    dMOUSE_self;
    MAGIC* const mg = (MAGIC*)XSANY.any_ptr;

    if (items != 1) {
        mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
            "Cannot assign a value to a read-only accessor");
    }

    SP -= items; /* PPCODE */
    PUTBACK;

    mouse_attr_get(aTHX_ self, mg);
}

XS(mouse_xs_writer)
{
    dVAR; dXSARGS;
    dMOUSE_self;
    MAGIC* const mg = (MAGIC*)XSANY.any_ptr;

    if (items != 2) {
        mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
            "Too few arguments for a write-only accessor");
    }

    SP -= items; /* PPCODE */
    PUTBACK;

    mouse_attr_set(aTHX_ self, mg, ST(1));
}

/* simple accessors */

/*
static MAGIC*
mouse_accessor_get_mg(pTHX_ CV* const xsub){
    return moose_mg_find(aTHX_ (SV*)xsub, &mouse_simple_accessor_vtbl, MOOSEf_DIE_ON_FAIL);
}
*/

CV*
mouse_install_simple_accessor(pTHX_ const char* const fq_name, const char* const key, I32 const keylen, XSUBADDR_t const accessor_impl){
    CV* const xsub = newXS((char*)fq_name, accessor_impl, __FILE__);
    SV* const slot = newSVpvn_share(key, keylen, 0U);
    MAGIC* mg;

    if(!fq_name){
        /* anonymous xsubs need sv_2mortal */
        sv_2mortal((SV*)xsub);
    }

    mg = sv_magicext((SV*)xsub, slot, PERL_MAGIC_ext, &mouse_accessor_vtbl, NULL, 0);
    SvREFCNT_dec(slot); /* sv_magicext() increases refcnt in mg_obj */

    /* NOTE:
     * although we use MAGIC for gc, we also store mg to CvXSUBANY for efficiency (gfx)
     */
    CvXSUBANY(xsub).any_ptr = (void*)mg;

    return xsub;
}

XS(mouse_xs_simple_reader)
{
    dVAR; dXSARGS;
    dMOUSE_self;
    SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
    SV* value;

    if (items != 1) {
        croak("Expected exactly one argument for a reader for '%"SVf"'", slot);
    }

    value = mouse_instance_get_slot(aTHX_ self, slot);
    ST(0) = value ? value : &PL_sv_undef;
    XSRETURN(1);
}


XS(mouse_xs_simple_writer)
{
    dVAR; dXSARGS;
    dMOUSE_self;
    SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);

    if (items != 2) {
        croak("Expected exactly two argument for a writer for '%"SVf"'", slot);
    }

    ST(0) = mouse_instance_set_slot(aTHX_ self, slot, ST(1));
    XSRETURN(1);
}

XS(mouse_xs_simple_clearer)
{
    dVAR; dXSARGS;
    dMOUSE_self;
    SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
    SV* value;

    if (items != 1) {
        croak("Expected exactly one argument for a clearer for '%"SVf"'", slot);
    }

    value = mouse_instance_delete_slot(aTHX_ self, slot);
    ST(0) = value ? value : &PL_sv_undef;
    XSRETURN(1);
}

XS(mouse_xs_simple_predicate)
{
    dVAR; dXSARGS;
    dMOUSE_self;
    SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);

    if (items != 1) {
        croak("Expected exactly one argument for a predicate for '%"SVf"'", slot);
    }

    ST(0) = boolSV( mouse_instance_has_slot(aTHX_ self, slot) );
    XSRETURN(1);
}

/* simple instance slot accessor */

SV*
mouse_instance_create(pTHX_ HV* const stash) {
    assert(stash);
    return sv_bless( newRV_noinc((SV*)newHV()), stash );
}

SV*
mouse_instance_clone(pTHX_ SV* const instance) {
    HV* proto;
    assert(instance);

    CHECK_INSTANCE(instance);
    proto = newHVhv((HV*)SvRV(instance));
    return sv_bless( newRV_noinc((SV*)proto), SvSTASH(SvRV(instance)) );
}

bool
mouse_instance_has_slot(pTHX_ SV* const instance, SV* const slot) {
    assert(instance);
    assert(slot);
    CHECK_INSTANCE(instance);
    return hv_exists_ent((HV*)SvRV(instance), slot, 0U);
}

SV*
mouse_instance_get_slot(pTHX_ SV* const instance, SV* const slot) {
    HE* he;
    assert(instance);
    assert(slot);
    CHECK_INSTANCE(instance);
    he = hv_fetch_ent((HV*)SvRV(instance), slot, FALSE, 0U);
    return he ? HeVAL(he) : NULL;
}

SV*
mouse_instance_set_slot(pTHX_ SV* const instance, SV* const slot, SV* const value) {
    HE* he;
    SV* sv;
    assert(instance);
    assert(slot);
    assert(value);
    CHECK_INSTANCE(instance);
    he = hv_fetch_ent((HV*)SvRV(instance), slot, TRUE, 0U);
    sv = HeVAL(he);
    sv_setsv_mg(sv, value);
    return sv;
}

SV*
mouse_instance_delete_slot(pTHX_ SV* const instance, SV* const slot) {
    assert(instance);
    assert(slot);
    CHECK_INSTANCE(instance);
    return hv_delete_ent((HV*)SvRV(instance), slot, 0, 0U);
}

void
mouse_instance_weaken_slot(pTHX_ SV* const instance, SV* const slot) {
    HE* he;
    assert(instance);
    assert(slot);
    CHECK_INSTANCE(instance);
    he = hv_fetch_ent((HV*)SvRV(instance), slot, FALSE, 0U);
    if(he){
        sv_rvweaken(HeVAL(he));
    }
}
\r
MODULE = Mouse::Meta::Method::Accessor::XS  PACKAGE = Mouse::Meta::Method::Accessor::XS

PROTOTYPES:   DISABLE
VERSIONCHECK: DISABLE

CV*
_generate_accessor(klass, SV* attr, metaclass)
CODE:
{
    RETVAL = mouse_instantiate_xs_accessor(aTHX_ attr, mouse_xs_accessor);
}
OUTPUT:
    RETVAL

CV*
_generate_reader(klass, SV* attr, metaclass)
CODE:
{
    RETVAL = mouse_instantiate_xs_accessor(aTHX_ attr, mouse_xs_reader);
}
OUTPUT:
    RETVAL

CV*
_generate_writer(klass, SV* attr, metaclass)
CODE:
{
    RETVAL = mouse_instantiate_xs_accessor(aTHX_ attr, mouse_xs_writer);
}
OUTPUT:
    RETVAL

CV*
_generate_clearer(klass, SV* attr, metaclass)
CODE:
{
    SV* const slot = mcall0s(attr, "name");
    STRLEN len;
    const char* const pv = SvPV_const(slot, len);
    RETVAL = mouse_install_simple_accessor(aTHX_ NULL, pv, len, mouse_xs_simple_clearer);
}
OUTPUT:
    RETVAL

CV*
_generate_predicate(klass, SV* attr, metaclass)
CODE:
{
    SV* const slot = mcall0s(attr, "name");
    STRLEN len;
    const char* const pv = SvPV_const(slot, len);
    RETVAL = mouse_install_simple_accessor(aTHX_ NULL, pv, len, mouse_xs_simple_predicate);
}
OUTPUT:
    RETVAL
Commit	Line	Data
646c0371	1	#include "mouse.h"
	2
	3	#define CHECK_INSTANCE(instance) STMT_START{ \
	4	if(!(SvROK(instance) && SvTYPE(SvRV(instance)) == SVt_PVHV)){ \
	5	croak("Invalid object for instance managers"); \
	6	} \
	7	} STMT_END
	8
	9	/* Moose XS Attribute object */
	10	enum mouse_xa_ix_t{
	11	MOUSE_XA_ATTRIBUTE,
	12	MOUSE_XA_TC,
	13	MOUSE_XA_TC_CODE,
	14
	15	MOUSE_XA_last
	16	};
	17
	18	#define MOUSE_xa_attribute(m) MOUSE_av_at(m, MOUSE_XA_ATTRIBUTE)
	19	#define MOUSE_xa_tc(m) MOUSE_av_at(m, MOUSE_XA_TC)
	20	#define MOUSE_xa_tc_code(m) MOUSE_av_at(m, MOUSE_XA_TC_CODE)
	21
	22	#define MOUSE_mg_attribute(mg) MOUSE_xa_attribute(MOUSE_mg_xa(mg))
	23
	24	enum mouse_xa_flags_t{
	25	MOUSEf_ATTR_HAS_TC = 0x0001,
	26	MOUSEf_ATTR_HAS_DEFAULT = 0x0002,
	27	MOUSEf_ATTR_HAS_BUILDER = 0x0004,
	28	MOUSEf_ATTR_HAS_INITIALIZER = 0x0008, /* not used in Mouse */
	29	MOUSEf_ATTR_HAS_TRIGGER = 0x0010,
	30
	31	MOUSEf_ATTR_IS_LAZY = 0x0020,
	32	MOUSEf_ATTR_IS_WEAK_REF = 0x0040,
	33	MOUSEf_ATTR_IS_REQUIRED = 0x0080,
	34
	35	MOUSEf_ATTR_SHOULD_COERCE = 0x0100,
	36
	37	MOUSEf_ATTR_SHOULD_AUTO_DEREF
	38	= 0x0200,
	39	MOUSEf_TC_IS_ARRAYREF = 0x0400,
	40	MOUSEf_TC_IS_HASHREF = 0x0800,
	41
	42	MOUSEf_OTHER1 = 0x1000,
	43	MOUSEf_OTHER2 = 0x2000,
	44	MOUSEf_OTHER3 = 0x4000,
	45	MOUSEf_OTHER4 = 0x8000,
	46
	47	MOUSEf_MOUSE_MASK = 0xFFFF /* not used */
	48	};
	49
	50	static MGVTBL mouse_accessor_vtbl; /* MAGIC identity */
	51
	52
	53	SV*
	54	mouse_accessor_get_self(pTHX_ I32 const ax, I32 const items, CV* const cv) {
	55	SV* self;
	56
	57	if(items < 1){
	58	croak("Too few arguments for %s", GvNAME(CvGV(cv)));
	59	}
	60
	61	/* NOTE: If self has GETMAGIC, $self->accessor will invoke GETMAGIC
	62	* before calling methods, so SvGETMAGIC(self) is not necessarily needed here.
	63	*/
	64
65	self = ST(0);
66	if(!IsObject(self)){
67	croak("Cant call %s as a class method", GvNAME(CvGV(cv)));
68	}
69	return self;
70	}
71
72
73	CV*
74	mouse_instantiate_xs_accessor(pTHX_ SV* const attr, XSUBADDR_t const accessor_impl){
75	SV* const slot = mcall0(attr, mouse_name);
76	AV* const xa = newAV();
77	CV* xsub;
78	MAGIC* mg;
79	U16 flags = 0;
80
81	sv_2mortal((SV*)xa);
82
83	xsub = newXS(NULL, accessor_impl, __FILE__);
84	sv_2mortal((SV*)xsub);
85
86	mg = sv_magicext((SV)xsub, slot, PERL_MAGIC_ext, &mouse_accessor_vtbl, (char)xa, HEf_SVKEY);
87
88	/* NOTE:
89	* although we use MAGIC for gc, we also store mg to CvXSUBANY for efficiency (gfx)
90	*/
91	CvXSUBANY(xsub).any_ptr = (void*)mg;
92
93	av_extend(xa, MOUSE_XA_last - 1);
94
95	av_store(xa, MOUSE_XA_ATTRIBUTE, newSVsv(attr));
96
97	/* prepare attribute status */
98	/* XXX: making it lazy is a good way? */
99
100	if(SvTRUEx(mcall0s(attr, "has_type_constraint"))){
101	SV* tc;
102	flags \|= MOUSEf_ATTR_HAS_TC;
103
104	ENTER;
105	SAVETMPS;
106
107	tc = mcall0s(attr, "type_constraint");
108	av_store(xa, MOUSE_XA_TC, newSVsv(tc));
109
110	if(SvTRUEx(mcall0s(attr, "should_auto_deref"))){
111	flags \|= MOUSEf_ATTR_SHOULD_AUTO_DEREF;
112	if( SvTRUEx(mcall1s(tc, "is_a_type_of", newSVpvs_flags("ArrayRef", SVs_TEMP))) ){
113	flags \|= MOUSEf_TC_IS_ARRAYREF;
114	}
115	else if( SvTRUEx(mcall1s(tc, "is_a_type_of", newSVpvs_flags("HashRef", SVs_TEMP))) ){
116	flags \|= MOUSEf_TC_IS_HASHREF;
117	}
118	else{
119	mouse_throw_error(attr, tc,
120	"Can not auto de-reference the type constraint '%"SVf"'",
121	mcall0(tc, mouse_name));
122	}
123	}
124
125	if(SvTRUEx(mcall0s(attr, "should_coerce"))){
126	flags \|= MOUSEf_ATTR_SHOULD_COERCE;
127	}
128
129	FREETMPS;
130	LEAVE;
131	}
132
133	if(SvTRUEx(mcall0s(attr, "has_trigger"))){
134	flags \|= MOUSEf_ATTR_HAS_TRIGGER;
135	}
136
137	if(SvTRUEx(mcall0s(attr, "is_lazy"))){
138	flags \|= MOUSEf_ATTR_IS_LAZY;
139
140	if(SvTRUEx(mcall0s(attr, "has_builder"))){
141	flags \|= MOUSEf_ATTR_HAS_BUILDER;
142	}
143	else if(SvTRUEx(mcall0s(attr, "has_default"))){
144	flags \|= MOUSEf_ATTR_HAS_DEFAULT;
145	}
146	}
147
148	if(SvTRUEx(mcall0s(attr, "is_weak_ref"))){
149	flags \|= MOUSEf_ATTR_IS_WEAK_REF;
150	}
151
152	if(SvTRUEx(mcall0s(attr, "is_required"))){
153	flags \|= MOUSEf_ATTR_IS_REQUIRED;
154	}
155
156	MOUSE_mg_flags(mg) = flags;
157
158	return xsub;
159	}
160
161	static SV*
162	mouse_apply_type_constraint(pTHX_ AV* const xa, SV* value, U16 const flags){
163	SV* const tc = MOUSE_xa_tc(xa);
164	SV* tc_code;
165
166	if(flags & MOUSEf_ATTR_SHOULD_COERCE){
167	value = mcall1s(tc, "coerce", value);
168	}
169
170	if(!SvOK(MOUSE_xa_tc_code(xa))){
171	XS(XS_Mouse__Util__TypeConstraints_Item); /* prototype defined in Mouse.xs */
172
173	tc_code = mcall0s(tc, "_compiled_type_constraint");
174
175	if(SvROK(tc_code) && SvTYPE(SvRV(tc_code))
176	&& CvXSUB((CV*)SvRV(tc_code)) == XS_Mouse__Util__TypeConstraints_Item){
177	/* built-in type constraints */
178	mouse_tc const id = CvXSUBANY((CV*)SvRV(tc_code)).any_i32;
179	av_store(xa, MOUSE_XA_TC_CODE, newSViv(id));
180	}
181	else{
182	av_store(xa, MOUSE_XA_TC_CODE, newSVsv(tc_code));
183	}
184	}
185	else{
186	tc_code = MOUSE_xa_tc_code(xa);
187	}
188
189	if(!mouse_tc_check(aTHX_ tc_code, value)){
190	mouse_throw_error(MOUSE_xa_attribute(xa), value,
191	"Attribute (%"SVf") does not pass the type constraint because: %"SVf,
192	mcall0(MOUSE_xa_attribute(xa), mouse_name),
193	mcall1s(tc, "get_message", value));
194	}
195
196	return value;
197	}
198
208ffaeb	199	#define PUSH_VALUE(value, flags) STMT_START { \
	200	if((flags) & MOUSEf_ATTR_SHOULD_AUTO_DEREF && GIMME_V == G_ARRAY){ \
	201	mouse_push_values(aTHX_ value, (flags)); \
	202	} \
	203	else{ \
	204	dSP; \
	205	XPUSHs(value ? value : &PL_sv_undef); \
	206	PUTBACK; \
	207	} \
	208	} STMT_END \
646c0371	209
	210	/* pushes return values, does auto-deref if needed */
	211	static void
	212	mouse_push_values(pTHX_ SV* const value, U16 const flags){
	213	dSP;
	214
208ffaeb	215	assert( flags & MOUSEf_ATTR_SHOULD_AUTO_DEREF && GIMME_V == G_ARRAY );
646c0371	216
208ffaeb	217	if(!(value && SvOK(value))){
	218	return;
	219	}
646c0371	220
208ffaeb	221	if(flags & MOUSEf_TC_IS_ARRAYREF){
	222	AV* const av = (AV*)SvRV(value);
	223	I32 len;
	224	I32 i;
646c0371	225
208ffaeb	226	if(SvTYPE(av) != SVt_PVAV){
208ffaeb	227	croak("Mouse-panic: Not an ARRAY reference");
646c0371	228	}
646c0371	229
208ffaeb	230	len = av_len(av) + 1;
	231	EXTEND(SP, len);
	232	for(i = 0; i < len; i++){
	233	SV** const svp = av_fetch(av, i, FALSE);
	234	PUSHs(svp ? *svp : &PL_sv_undef);
646c0371	235	}
646c0371	236	}
208ffaeb	237	else if(flags & MOUSEf_TC_IS_HASHREF){
	238	HV* const hv = (HV*)SvRV(value);
	239	HE* he;
	240
	241	if(SvTYPE(hv) != SVt_PVHV){
	242	croak("Mouse-panic: Not a HASH reference");
	243	}
	244
	245	hv_iterinit(hv);
	246	while((he = hv_iternext(hv))){
	247	EXTEND(SP, 2);
	248	PUSHs(hv_iterkeysv(he));
	249	PUSHs(hv_iterval(hv, he));
	250	}
646c0371	251	}
	252
	253	PUTBACK;
	254	}
	255
	256	static void
	257	mouse_attr_get(pTHX_ SV* const self, MAGIC* const mg){
	258	U16 const flags = MOUSE_mg_flags(mg);
	259	SV* const slot = MOUSE_mg_slot(mg);
	260	SV* value;
	261
	262	value = mouse_instance_get_slot(aTHX_ self, slot);
	263
	264	/* check_lazy */
	265	if( !value && flags & MOUSEf_ATTR_IS_LAZY ){
	266	AV* const xa = MOUSE_mg_xa(mg);
	267	SV* const attr = MOUSE_xa_attribute(xa);
	268
	269	/* get default value by $attr->default or $attr->builder */
	270	if(flags & MOUSEf_ATTR_HAS_DEFAULT){
	271	value = mcall0s(attr, "default");
	272
	273	if(SvROK(value) && SvTYPE(SvRV(value)) == SVt_PVCV){
	274	value = mcall0(self, value);
	275	}
	276	}
	277	else if(flags & MOUSEf_ATTR_HAS_BUILDER){
	278	SV* const builder = mcall0s(attr, "builder");
	279	value = mcall0(self, builder);
	280	}
	281
	282	if(!value){
	283	value = sv_newmortal();
	284	}
	285
	286	/* apply coerce and type constraint */
	287	if(flags & MOUSEf_ATTR_HAS_TC){
	288	value = mouse_apply_type_constraint(aTHX_ xa, value, flags);
	289	}
	290
	291	/* store value to slot */
	292	value = mouse_instance_set_slot(aTHX_ self, slot, value);
	293	}
	294
208ffaeb	295	PUSH_VALUE(value, flags);
646c0371	296	}
	297
	298	static void
	299	mouse_attr_set(pTHX_ SV* const self, MAGIC* const mg, SV* value){
	300	U16 const flags = MOUSE_mg_flags(mg);
	301	SV* const slot = MOUSE_mg_slot(mg);
	302
	303	if(flags & MOUSEf_ATTR_HAS_TC){
	304	value = mouse_apply_type_constraint(aTHX_ MOUSE_mg_xa(mg), value, flags);
	305	}
	306
	307	mouse_instance_set_slot(aTHX_ self, slot, value);
	308
	309	if(flags & MOUSEf_ATTR_IS_WEAK_REF){
	310	mouse_instance_weaken_slot(aTHX_ self, slot);
	311	}
	312
	313	if(flags & MOUSEf_ATTR_HAS_TRIGGER){
	314	SV* const trigger = mcall0s(MOUSE_mg_attribute(mg), "trigger");
	315	dSP;
	316
	317	PUSHMARK(SP);
	318	EXTEND(SP, 2);
	319	PUSHs(self);
	320	PUSHs(value);
	321
	322	PUTBACK;
	323	call_sv(trigger, G_VOID \| G_DISCARD);
	324	/* need not SPAGAIN */
	325	}
	326
208ffaeb	327	PUSH_VALUE(value, flags);
646c0371	328	}
	329
	330	XS(mouse_xs_accessor)
	331	{
	332	dVAR; dXSARGS;
	333	dMOUSE_self;
	334	MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
	335
	336	SP -= items; /* PPCODE */
	337	PUTBACK;
	338
	339	if(items == 1){ /* reader */
	340	mouse_attr_get(aTHX_ self, mg);
	341	}
	342	else if (items == 2){ /* writer */
	343	mouse_attr_set(aTHX_ self, mg, ST(1));
	344	}
	345	else{
	346	mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
	347	"Expected exactly one or two argument for an accessor");
	348	}
	349	}
	350
	351
	352	XS(mouse_xs_reader)
	353	{
	354	dVAR; dXSARGS;
	355	dMOUSE_self;
	356	MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
	357
	358	if (items != 1) {
	359	mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
	360	"Cannot assign a value to a read-only accessor");
	361	}
	362
	363	SP -= items; /* PPCODE */
	364	PUTBACK;
	365
	366	mouse_attr_get(aTHX_ self, mg);
	367	}
	368
	369	XS(mouse_xs_writer)
	370	{
	371	dVAR; dXSARGS;
	372	dMOUSE_self;
	373	MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
	374
	375	if (items != 2) {
	376	mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
	377	"Too few arguments for a write-only accessor");
	378	}
	379
	380	SP -= items; /* PPCODE */
	381	PUTBACK;
	382
	383	mouse_attr_set(aTHX_ self, mg, ST(1));
	384	}
	385
	386	/* simple accessors */
	387
	388	/*
	389	static MAGIC*
	390	mouse_accessor_get_mg(pTHX_ CV* const xsub){
	391	return moose_mg_find(aTHX_ (SV*)xsub, &mouse_simple_accessor_vtbl, MOOSEf_DIE_ON_FAIL);
392	}
393	*/
394
395	CV*
396	mouse_install_simple_accessor(pTHX_ const char* const fq_name, const char* const key, I32 const keylen, XSUBADDR_t const accessor_impl){
397	CV* const xsub = newXS((char*)fq_name, accessor_impl, __FILE__);
398	SV* const slot = newSVpvn_share(key, keylen, 0U);
399	MAGIC* mg;
400
401	if(!fq_name){
402	/* anonymous xsubs need sv_2mortal */
403	sv_2mortal((SV*)xsub);
404	}
405
406	mg = sv_magicext((SV*)xsub, slot, PERL_MAGIC_ext, &mouse_accessor_vtbl, NULL, 0);
407	SvREFCNT_dec(slot); /* sv_magicext() increases refcnt in mg_obj */
408
409	/* NOTE:
410	* although we use MAGIC for gc, we also store mg to CvXSUBANY for efficiency (gfx)
411	*/
412	CvXSUBANY(xsub).any_ptr = (void*)mg;
413
414	return xsub;
415	}
416
417	XS(mouse_xs_simple_reader)
418	{
419	dVAR; dXSARGS;
420	dMOUSE_self;
421	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
422	SV* value;
423
424	if (items != 1) {
425	croak("Expected exactly one argument for a reader for '%"SVf"'", slot);
426	}
427
428	value = mouse_instance_get_slot(aTHX_ self, slot);
429	ST(0) = value ? value : &PL_sv_undef;
430	XSRETURN(1);
431	}
432
433
434	XS(mouse_xs_simple_writer)
435	{
436	dVAR; dXSARGS;
437	dMOUSE_self;
438	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
439
440	if (items != 2) {
441	croak("Expected exactly two argument for a writer for '%"SVf"'", slot);
442	}
443
444	ST(0) = mouse_instance_set_slot(aTHX_ self, slot, ST(1));
445	XSRETURN(1);
446	}
447
448	XS(mouse_xs_simple_clearer)
449	{
450	dVAR; dXSARGS;
451	dMOUSE_self;
452	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
453	SV* value;
454
455	if (items != 1) {
456	croak("Expected exactly one argument for a clearer for '%"SVf"'", slot);
457	}
458
459	value = mouse_instance_delete_slot(aTHX_ self, slot);
460	ST(0) = value ? value : &PL_sv_undef;
461	XSRETURN(1);
462	}
463
464	XS(mouse_xs_simple_predicate)
465	{
466	dVAR; dXSARGS;
467	dMOUSE_self;
468	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
469
470	if (items != 1) {
471	croak("Expected exactly one argument for a predicate for '%"SVf"'", slot);
472	}
473
474	ST(0) = boolSV( mouse_instance_has_slot(aTHX_ self, slot) );
475	XSRETURN(1);
476	}
477
478	/* simple instance slot accessor */
479
480	SV*
481	mouse_instance_create(pTHX_ HV* const stash) {
482	assert(stash);
483	return sv_bless( newRV_noinc((SV*)newHV()), stash );
484	}
485
486	SV*
487	mouse_instance_clone(pTHX_ SV* const instance) {
488	HV* proto;
489	assert(instance);
490
491	CHECK_INSTANCE(instance);
492	proto = newHVhv((HV*)SvRV(instance));
493	return sv_bless( newRV_noinc((SV*)proto), SvSTASH(SvRV(instance)) );
494	}
495
496	bool
497	mouse_instance_has_slot(pTHX_ SV* const instance, SV* const slot) {
498	assert(instance);
499	assert(slot);
500	CHECK_INSTANCE(instance);
501	return hv_exists_ent((HV*)SvRV(instance), slot, 0U);
502	}
503
504	SV*
505	mouse_instance_get_slot(pTHX_ SV* const instance, SV* const slot) {
506	HE* he;
507	assert(instance);
508	assert(slot);
509	CHECK_INSTANCE(instance);
510	he = hv_fetch_ent((HV*)SvRV(instance), slot, FALSE, 0U);
511	return he ? HeVAL(he) : NULL;
512	}
513
514	SV*
515	mouse_instance_set_slot(pTHX_ SV* const instance, SV* const slot, SV* const value) {
516	HE* he;
517	SV* sv;
518	assert(instance);
519	assert(slot);
520	assert(value);
521	CHECK_INSTANCE(instance);
522	he = hv_fetch_ent((HV*)SvRV(instance), slot, TRUE, 0U);
523	sv = HeVAL(he);
524	sv_setsv_mg(sv, value);
525	return sv;
526	}
527
528	SV*
529	mouse_instance_delete_slot(pTHX_ SV* const instance, SV* const slot) {
530	assert(instance);
531	assert(slot);
532	CHECK_INSTANCE(instance);
533	return hv_delete_ent((HV*)SvRV(instance), slot, 0, 0U);
534	}
535
536	void
537	mouse_instance_weaken_slot(pTHX_ SV* const instance, SV* const slot) {
538	HE* he;
539	assert(instance);
540	assert(slot);
541	CHECK_INSTANCE(instance);
542	he = hv_fetch_ent((HV*)SvRV(instance), slot, FALSE, 0U);
543	if(he){
544	sv_rvweaken(HeVAL(he));
545	}
546	}
547	\r
548	MODULE = Mouse::Meta::Method::Accessor::XS PACKAGE = Mouse::Meta::Method::Accessor::XS
549
550	PROTOTYPES: DISABLE
551	VERSIONCHECK: DISABLE
552
553	CV*
554	_generate_accessor(klass, SV* attr, metaclass)
555	CODE:
556	{
557	RETVAL = mouse_instantiate_xs_accessor(aTHX_ attr, mouse_xs_accessor);
558	}
559	OUTPUT:
560	RETVAL
561
562	CV*
563	_generate_reader(klass, SV* attr, metaclass)
564	CODE:
565	{
566	RETVAL = mouse_instantiate_xs_accessor(aTHX_ attr, mouse_xs_reader);
567	}
568	OUTPUT:
569	RETVAL
570
571	CV*
572	_generate_writer(klass, SV* attr, metaclass)
573	CODE:
574	{
575	RETVAL = mouse_instantiate_xs_accessor(aTHX_ attr, mouse_xs_writer);
576	}
577	OUTPUT:
578	RETVAL
579
580	CV*
581	_generate_clearer(klass, SV* attr, metaclass)
582	CODE:
583	{
584	SV* const slot = mcall0s(attr, "name");
585	STRLEN len;
586	const char* const pv = SvPV_const(slot, len);
587	RETVAL = mouse_install_simple_accessor(aTHX_ NULL, pv, len, mouse_xs_simple_clearer);
588	}
589	OUTPUT:
590	RETVAL
591
592	CV*
593	_generate_predicate(klass, SV* attr, metaclass)
594	CODE:
595	{
596	SV* const slot = mcall0s(attr, "name");
597	STRLEN len;
598	const char* const pv = SvPV_const(slot, len);
599	RETVAL = mouse_install_simple_accessor(aTHX_ NULL, pv, len, mouse_xs_simple_predicate);
600	}
601	OUTPUT:
602	RETVAL
603