Defining the instance construct.

§1.

enum INSTANCE_IST

void Inter::Instance::define?Usage of Inter::Instance::define:
Definition - §3(void) {
    inter_construct *IC = Inter::Defn::create_construct(
        INSTANCE_IST,
        L"instance (%i+) (%c+)",
        I"instance", I"instances");
    METHOD_ADD(IC, CONSTRUCT_READ_MTID, Inter::Instance::read);
    METHOD_ADD(IC, CONSTRUCT_TRANSPOSE_MTID, Inter::Instance::transpose);
    METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, Inter::Instance::verify);
    METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, Inter::Instance::write);
}

§2.

define DEFN_INST_IFLD 2
define KIND_INST_IFLD 3
define VAL1_INST_IFLD 4
define VAL2_INST_IFLD 5
define PLIST_INST_IFLD 6
define PERM_LIST_INST_IFLD 7
define EXTENT_INST_IFR 8

void Inter::Instance::read?Usage of Inter::Instance::read:
§1(inter_construct *IC, inter_bookmark *IBM, inter_line_parse *ilp, inter_error_location *eloc, inter_error_message **E) {
    *E = Inter::Defn::vet_level(IBM, INSTANCE_IST, ilp->indent_level, eloc);
    if (*E) return;

    if (Inter::Annotations::exist(&(ilp->set))) { *E = Inter::Errors::plain(I"__annotations are not allowed", eloc); return; }

    text_stream *ktext = ilp->mr.exp[1], *vtext = NULL;

    match_results mr2 = Regexp::create_mr();
    if (Regexp::match(&mr2, ktext, L"(%i+) = (%c+)")) { ktext = mr2.exp[0]; vtext = mr2.exp[1]; }

    inter_symbol *inst_name = Inter::Textual::new_symbol(eloc, Inter::Bookmarks::scope(IBM), ilp->mr.exp[0], E);
    if (*E) return;
    inter_symbol *inst_kind = Inter::Textual::find_symbol(Inter::Bookmarks::tree(IBM), eloc, Inter::Bookmarks::scope(IBM), ktext, KIND_IST, E);
    if (*E) return;

    inter_data_type *idt = Inter::Kind::data_type(inst_kind);
    if (Inter::Types::is_enumerated(idt) == FALSE)
        { *E = Inter::Errors::quoted(I"not a kind which has instances", ilp->mr.exp[1], eloc); return; }

    inter_ti v1 = UNDEF_IVAL, v2 = 0;
    if (vtext) {
        *E = Inter::Types::read(ilp->line, eloc, Inter::Bookmarks::tree(IBM), Inter::Bookmarks::package(IBM), NULL, vtext, &v1, &v2, Inter::Bookmarks::scope(IBM));
        if (*E) return;
    }
    *E = Inter::Instance::new(IBM, InterSymbolsTables::id_from_IRS_and_symbol(IBM, inst_name), InterSymbolsTables::id_from_IRS_and_symbol(IBM, inst_kind), v1, v2, (inter_ti) ilp->indent_level, eloc);
}

inter_error_message *Inter::Instance::new(inter_bookmark *IBM, inter_ti SID, inter_ti KID, inter_ti V1, inter_ti V2, inter_ti level, inter_error_location *eloc) {
    inter_warehouse *warehouse = Inter::Bookmarks::warehouse(IBM);
    inter_ti L1 = Inter::Warehouse::create_frame_list(warehouse);
    inter_ti L2 = Inter::Warehouse::create_frame_list(warehouse);
    Inter::Warehouse::attribute_resource(warehouse, L1, Inter::Bookmarks::package(IBM));
    Inter::Warehouse::attribute_resource(warehouse, L2, Inter::Bookmarks::package(IBM));
    inter_tree_node *P = Inode::fill_6(IBM, INSTANCE_IST, SID, KID, V1, V2, L1, L2, eloc, level);
    inter_error_message *E = Inter::Defn::verify_construct(Inter::Bookmarks::package(IBM), P);
    if (E) return E;
    Inter::Bookmarks::insert(IBM, P);
    return NULL;
}

void Inter::Instance::transpose?Usage of Inter::Instance::transpose:
§1(inter_construct *IC, inter_tree_node *P, inter_ti *grid, inter_ti grid_extent, inter_error_message **E) {
    P->W.data[PLIST_INST_IFLD] = grid[P->W.data[PLIST_INST_IFLD]];
    P->W.data[PERM_LIST_INST_IFLD] = grid[P->W.data[PERM_LIST_INST_IFLD]];
}

void Inter::Instance::verify?Usage of Inter::Instance::verify:
§1(inter_construct *IC, inter_tree_node *P, inter_package *owner, inter_error_message **E) {
    if (P->W.extent != EXTENT_INST_IFR) { *E = Inode::error(P, I"extent wrong", NULL); return; }
    *E = Inter::Verify::defn(owner, P, DEFN_INST_IFLD); if (*E) return;
    inter_symbol *inst_name = InterSymbolsTables::symbol_from_id(Inter::Packages::scope(owner), P->W.data[DEFN_INST_IFLD]);
    *E = Inter::Verify::symbol(owner, P, P->W.data[KIND_INST_IFLD], KIND_IST); if (*E) return;
    inter_symbol *inst_kind = InterSymbolsTables::symbol_from_id(Inter::Packages::scope(owner), P->W.data[KIND_INST_IFLD]);
    inter_data_type *idt = Inter::Kind::data_type(inst_kind);
    if (Inter::Types::is_enumerated(idt)) {
        if (P->W.data[VAL1_INST_IFLD] == UNDEF_IVAL) {
            P->W.data[VAL1_INST_IFLD] = LITERAL_IVAL;
            P->W.data[VAL2_INST_IFLD] = Inter::Kind::next_enumerated_value(inst_kind);
        }
    } else { *E = Inode::error(P, I"not a kind which has instances", NULL); return; }
    *E = Inter::Verify::value(owner, P, VAL1_INST_IFLD, inst_kind); if (*E) return;

    inter_ti vcount = Inode::vcount(P);
    if (vcount == 0) {
        Inter::Kind::new_instance(inst_kind, inst_name);
    }
}

inter_ti Inter::Instance::permissions_list?Usage of Inter::Instance::permissions_list:
The PropertyValue Construct - §2
The Permission Construct - §2(inter_symbol *kind_symbol) {
    if (kind_symbol == NULL) return 0;
    inter_tree_node *D = Inter::Symbols::definition(kind_symbol);
    if (D == NULL) return 0;
    return D->W.data[PERM_LIST_INST_IFLD];
}

void Inter::Instance::write?Usage of Inter::Instance::write:
§1(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P, inter_error_message **E) {
    inter_symbol *inst_name = InterSymbolsTables::symbol_from_frame_data(P, DEFN_INST_IFLD);
    inter_symbol *inst_kind = InterSymbolsTables::symbol_from_frame_data(P, KIND_INST_IFLD);
    if ((inst_name) && (inst_kind)) {
        inter_data_type *idt = Inter::Kind::data_type(inst_kind);
        if (idt) {
            WRITE("instance %S %S = ", inst_name->symbol_name, inst_kind->symbol_name);
            Inter::Types::write(OUT, P, NULL,
                P->W.data[VAL1_INST_IFLD], P->W.data[VAL2_INST_IFLD], Inter::Packages::scope_of(P), FALSE);
        } else { *E = Inode::error(P, I"instance with bad data type", NULL); return; }
    } else { *E = Inode::error(P, I"bad instance", NULL); return; }
    Inter::Symbols::write_annotations(OUT, P, inst_name);
}

inter_ti Inter::Instance::properties_list?Usage of Inter::Instance::properties_list:
The PropertyValue Construct - §2(inter_symbol *inst_name) {
    if (inst_name == NULL) return 0;
    inter_tree_node *D = Inter::Symbols::definition(inst_name);
    if (D == NULL) return 0;
    return D->W.data[PLIST_INST_IFLD];
}

inter_symbol *Inter::Instance::kind_of?Usage of Inter::Instance::kind_of:
Inter Data Types - §2, §3
The PropertyValue Construct - §2(inter_symbol *inst_name) {
    if (inst_name == NULL) return NULL;
    inter_tree_node *D = Inter::Symbols::definition(inst_name);
    if (D == NULL) return NULL;
    if (D->W.data[ID_IFLD] != INSTANCE_IST) return NULL;
    return InterSymbolsTables::symbol_from_frame_data(D, KIND_INST_IFLD);
}