Defining the local construct.

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

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

void LocalInstruction::define_construct?Usage of LocalInstruction::define_construct:
Inter Constructs - §15(void) {
    inter_construct *IC = InterInstruction::create_construct(LOCAL_IST, I"local");
    InterInstruction::defines_symbol_in_fields(IC, DEFN_LOCAL_IFLD, TYPE_LOCAL_IFLD);
    InterInstruction::specify_syntax(IC, I"local TOKENS");
    InterInstruction::data_extent_always(IC, 2);
    InterInstruction::permit(IC, INSIDE_CODE_PACKAGE_ICUP);
    METHOD_ADD(IC, CONSTRUCT_READ_MTID, LocalInstruction::read);
    METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, LocalInstruction::verify);
    METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, LocalInstruction::write);
}

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

define DEFN_LOCAL_IFLD (DATA_IFLD + 0)
define TYPE_LOCAL_IFLD (DATA_IFLD + 1)

inter_error_message *LocalInstruction::new?Usage of LocalInstruction::new:
§4(inter_bookmark *IBM, inter_symbol *variable_s,
    inter_type var_type, inter_ti level, inter_error_location *eloc) {
    inter_tree_node *P = Inode::new_with_2_data_fields(IBM, LOCAL_IST,
        /* DEFN_LOCAL_IFLD: */ InterSymbolsTable::id_at_bookmark(IBM, variable_s),
        /* TYPE_LOCAL_IFLD: */ InterTypes::to_TID_at(IBM, var_type),
        eloc, level);
    inter_error_message *E = VerifyingInter::instruction(InterBookmark::package(IBM), P);
    if (E) return E;
    NodePlacement::move_to_moving_bookmark(P, IBM);
    return NULL;
}

§3. Verification consists only of sanity checks.

void LocalInstruction::verify?Usage of LocalInstruction::verify:
§1(inter_construct *IC, inter_tree_node *P,
    inter_package *owner, inter_error_message **E) {
    *E = VerifyingInter::TID_field(owner, P, TYPE_LOCAL_IFLD);
}

§4. Creating from textual Inter syntax.

void LocalInstruction::read?Usage of LocalInstruction::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];
    inter_symbol *variable_s = NULL;
    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 *T = InterBookmark::scope(IBM);
    inter_type var_type = InterTypes::parse_simple(T, eloc, type_text, E);
    if (*E == NULL) variable_s = TextualInter::new_symbol(eloc, T, name_text, E);
    Regexp::dispose_of(&mr);
    if (*E) return;

    InterSymbol::make_local(variable_s);
    SymbolAnnotation::copy_set_to_symbol(&(ilp->set), variable_s);

    *E = LocalInstruction::new(IBM, variable_s, var_type, (inter_ti) ilp->indent_level, eloc);
}

§5. Writing to textual Inter syntax.

void LocalInstruction::write?Usage of LocalInstruction::write:
§1(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P) {
    WRITE("local ");
    TextualInter::write_optional_type_marker(OUT, P, TYPE_LOCAL_IFLD);
    inter_symbol *variable_s = LocalInstruction::variable(P);
    WRITE("%S", InterSymbol::identifier(variable_s));
}

§6. Access function.

inter_symbol *LocalInstruction::variable?Usage of LocalInstruction::variable:
§5(inter_tree_node *P) {
    if (P == NULL) return NULL;
    if (Inode::isnt(P, LOCAL_IST)) return NULL;
    return InterSymbolsTable::symbol_from_ID_at_node(P, DEFN_LOCAL_IFLD);
}