Defining the property construct.

• §1. Definition
• §2. Instructions
• §4. Creating from textual Inter syntax
• §5. Writing to textual Inter syntax
• §6. Access functions

§1. Definition. For what this does and why it is used, see Textual Inter (in inter).

void PropertyInstruction::define_construct?Usage of PropertyInstruction::define_construct:
Inter Constructs - §15(void) {
    inter_construct *IC = InterInstruction::create_construct(PROPERTY_IST, I"property");
    InterInstruction::defines_symbol_in_fields(IC, DEFN_PROP_IFLD, TYPE_PROP_IFLD);
    InterInstruction::specify_syntax(IC, I"property TOKENS");
    InterInstruction::data_extent_always(IC, 3);
    InterInstruction::permit(IC, INSIDE_PLAIN_PACKAGE_ICUP);
    METHOD_ADD(IC, CONSTRUCT_READ_MTID, PropertyInstruction::read);
    METHOD_ADD(IC, CONSTRUCT_TRANSPOSE_MTID, PropertyInstruction::transpose);
    METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, PropertyInstruction::verify);
    METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, PropertyInstruction::write);
}

§2. Instructions. In bytecode, the frame of a property instruction is laid out with the compulsory words — see Inter Nodes — followed by:

define DEFN_PROP_IFLD      (DATA_IFLD + 0)
define TYPE_PROP_IFLD      (DATA_IFLD + 1)
define PERM_LIST_PROP_IFLD (DATA_IFLD + 2)

inter_error_message *PropertyInstruction::new?Usage of PropertyInstruction::new:
§4(inter_bookmark *IBM, inter_symbol *prop_s,
    inter_type prop_type, inter_ti level, inter_error_location *eloc) {
    inter_package *pack = InterBookmark::package(IBM);
    inter_warehouse *warehouse = InterBookmark::warehouse(IBM);
    inter_tree_node *P = Inode::new_with_3_data_fields(IBM, PROPERTY_IST,
        /* DEFN_PROP_IFLD: */      InterSymbolsTable::id_at_bookmark(IBM, prop_s),
        /* TYPE_PROP_IFLD: */      InterTypes::to_TID_at(IBM, prop_type),
        /* PERM_LIST_PROP_IFLD: */ InterWarehouse::create_node_list(warehouse, pack),
        eloc, level);
    inter_error_message *E = VerifyingInter::instruction(pack, P);
    if (E) return E;
    NodePlacement::move_to_moving_bookmark(P, IBM);
    return NULL;
}

void PropertyInstruction::transpose?Usage of PropertyInstruction::transpose:
§1(inter_construct *IC, inter_tree_node *P,
    inter_ti *grid, inter_ti grid_extent, inter_error_message **E) {
    P->W.instruction[PERM_LIST_PROP_IFLD] = grid[P->W.instruction[PERM_LIST_PROP_IFLD]];
}

§3. Verification consists only of sanity checks.

void PropertyInstruction::verify?Usage of PropertyInstruction::verify:
§1(inter_construct *IC, inter_tree_node *P,
    inter_package *owner, inter_error_message **E) {
    *E = VerifyingInter::TID_field(owner, P, TYPE_PROP_IFLD);
    if (*E) return;
    *E = VerifyingInter::node_list_field(owner, P, PERM_LIST_PROP_IFLD);
    if (*E) return;
}

§4. Creating from textual Inter syntax.

void PropertyInstruction::read?Usage of PropertyInstruction::read:
§1(inter_construct *IC, inter_bookmark *IBM,
    inter_line_parse *ilp, inter_error_location *eloc, inter_error_message **E) {
    text_stream *type_text = NULL, *name_text = ilp->mr.exp[0];
    match_results mr = Regexp::create_mr();
    if (Regexp::match(&mr, name_text, U"%((%c+)%) (%c+)")) {
        type_text = mr.exp[0]; name_text = mr.exp[1];
    }
    inter_symbols_table *scope = InterBookmark::scope(IBM);
    inter_symbol *prop_name = TextualInter::new_symbol(eloc, scope, name_text, E);
    inter_type prop_type = InterTypes::unchecked();
    if (*E == NULL) prop_type = InterTypes::parse_simple(scope, eloc, type_text, E);
    Regexp::dispose_of(&mr);
    if (*E) return;

    SymbolAnnotation::copy_set_to_symbol(&(ilp->set), prop_name);
    *E = PropertyInstruction::new(IBM, prop_name, prop_type,
        (inter_ti) ilp->indent_level, eloc);
}

§5. Writing to textual Inter syntax.

void PropertyInstruction::write?Usage of PropertyInstruction::write:
§1(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P) {
    inter_symbol *prop_name = InterSymbolsTable::symbol_from_ID_at_node(P, DEFN_PROP_IFLD);
    WRITE("property ");
    TextualInter::write_optional_type_marker(OUT, P, TYPE_PROP_IFLD);
    WRITE("%S", InterSymbol::identifier(prop_name));
}

§6. Access functions.

inter_symbol *PropertyInstruction::property(inter_tree_node *P) {
    if (P == NULL) return NULL;
    if (Inode::isnt(P, PROPERTY_IST)) return NULL;
    return InterSymbolsTable::symbol_from_ID_at_node(P, DEFN_PROP_IFLD);
}

inter_ti PropertyInstruction::permissions_list?Usage of PropertyInstruction::permissions_list:
The Permission Construct - §3(inter_symbol *prop_name) {
    if (prop_name == NULL) return 0;
    inter_tree_node *D = InterSymbol::definition(prop_name);
    if (D == NULL) return 0;
    return D->W.instruction[PERM_LIST_PROP_IFLD];
}