To compile the actions submodule for a compilation unit, which contains _action packages.

• §1. Compilation data
• §8. Compilation

§1. Compilation data. Each action_name object contains this data:

typedef struct action_compilation_data {
    struct wording metadata_name;
    int translated;
    struct text_stream *translated_name;
    struct package_request *an_package;
    struct inter_name *an_base_iname;  e.g., Take
    struct inter_name *an_double_sharp_iname;  e.g., ##Take
    struct inter_name *an_processing_fn_iname;  e.g., TakeSub
    struct inter_name *variables_id;  for the shared variables set
    struct parse_node *where_created;
    int an_specification_text_word;  description used in index
    struct parse_node *designers_specification;  where created
} action_compilation_data;

action_compilation_data RTActions::new_data(wording W) {
    action_compilation_data acd;
    acd.metadata_name = W;
    acd.translated = FALSE;
    acd.translated_name = NULL;
    acd.an_double_sharp_iname = NULL;
    acd.an_base_iname = NULL;
    acd.an_processing_fn_iname = NULL;
    acd.an_package = NULL;
    acd.variables_id = NULL;
    acd.where_created = current_sentence;
    acd.designers_specification = NULL;
    acd.an_specification_text_word = -1;
    return acd;
}

• The structure action_compilation_data is accessed in 3/uo, 5/act, 5/mlt, 5/tbl, 5/tc, 5/dbi, 5/dli, 5/dci, 5/rlb, 5/prp, 5/lp, 5/nap and here.

§2. As usual, package requests and inter names are generated on demand.

package_request *RTActions::package?Usage of RTActions::package:
§3, §4, §6, §7, §8
Command Grammars - §16(action_name *an) {
    if (an->compilation_data.an_package == NULL)
        an->compilation_data.an_package =
            Hierarchy::local_package_to(ACTIONS_HAP, an->compilation_data.where_created);
    return an->compilation_data.an_package;
}

§3. This is the ID for the set of variables used by this action.

inter_name *RTActions::variables_id?Usage of RTActions::variables_id:
§8.3(action_name *an) {
    if (an->compilation_data.variables_id == NULL)
        an->compilation_data.variables_id =
            Hierarchy::make_iname_in(ACTION_SHV_ID_HL, RTActions::package(an));
    return an->compilation_data.variables_id;
}

§4. Base name, from which the other names are derived:

inter_name *RTActions::base_iname?Usage of RTActions::base_iname:
§5, §6, §7, §8.6(action_name *an) {
    if (an->compilation_data.an_base_iname == NULL) {
        if (waiting_action == an)
            an->compilation_data.an_base_iname =
                Hierarchy::make_iname_in(WAIT_HL, RTActions::package(an));
        else if (Str::len(an->compilation_data.translated_name) > 0)
            an->compilation_data.an_base_iname =
                Hierarchy::make_iname_with_specific_translation(TRANSLATED_BASE_NAME_HL,
                    an->compilation_data.translated_name, RTActions::package(an));
        else
            an->compilation_data.an_base_iname =
                Hierarchy::make_iname_with_shorter_memo(ACTION_BASE_NAME_HL,
                    RTActions::package(an), ActionNameNames::tensed(an, IS_TENSE));
    }
    return an->compilation_data.an_base_iname;
}

§5. We actually want the other names to still be related to the base name even after a translation; i.e., if an action is translated to Grab, then we want to have the related names be ##Grab and GrabSub. So translation needs to happen early-ish in the run, before the base iname is generated.

void RTActions::translate(action_name *an, wording W) {
    if (an->compilation_data.translated) {
        StandardProblems::sentence_problem(Task::syntax_tree(),
            _p_(PM_TranslatesActionAlready),
            "this action has already been translated",
            "so there must be some duplication somewhere.");
        return;
    }
    if (an->compilation_data.an_base_iname)
        internal_error("too late for action base name translation");
    an->compilation_data.translated = TRUE;
    an->compilation_data.translated_name = Str::new();
    WRITE_TO(an->compilation_data.translated_name, "%N", Wordings::first_wn(W));
    LOGIF(ACTION_CREATIONS, "Translated action: $l as %W\n", an, W);
}

text_stream *RTActions::identifier?Usage of RTActions::identifier:
§8.3(action_name *an) {
    return InterNames::to_text(RTActions::base_iname(an));
}

§6. The convention of writing actions with a ## prefix is lost in the mists of early Inform history. It's harmless enough, though.

inter_name *RTActions::double_sharp?Usage of RTActions::double_sharp:
§8.2, §8.3
Default Values - §2.7
Stored Action Literals - §1
Chronology - §5
Rulebooks - §8.1, §8.4.1.2
Command Grammars - §16
Command Grammar Lines - §6.4(action_name *an) {
    if (an->compilation_data.an_double_sharp_iname == NULL)
        an->compilation_data.an_double_sharp_iname =
            Hierarchy::derive_iname_in(DOUBLE_SHARP_NAME_HL,
                RTActions::base_iname(an), RTActions::package(an));
    return an->compilation_data.an_double_sharp_iname;
}

§7. Similarly, the function to carry out an action has been named with a Sub suffix for as long as anyone can remember. "Sub" simply meant "subroutine", and has its roots in Inform 1's predecessor, a Z-machine assembler called "zass". Again, we keep these conventions because why not. They are at least familiar to anyone reading the Inform 6 code we generate.

inter_name *RTActions::Sub?Usage of RTActions::Sub:
§8.5(action_name *an) {
    if (an->compilation_data.an_processing_fn_iname == NULL) {
        an->compilation_data.an_processing_fn_iname =
            Hierarchy::derive_iname_in(PERFORM_FN_HL,
                RTActions::base_iname(an), RTActions::package(an));
        Hierarchy::make_available(an->compilation_data.an_processing_fn_iname);
    }
    return an->compilation_data.an_processing_fn_iname;
}

void RTActions::actions_set_specification_text(action_name *an, int wn) {
    an->compilation_data.an_specification_text_word = wn;
}

§8. Compilation.

void RTActions::compile(void) {
    action_name *an;
    LOOP_OVER(an, action_name) {
        text_stream *desc = Str::new();
        WRITE_TO(desc, "action %W", an->compilation_data.metadata_name);
        Sequence::queue(&RTActions::compilation_agent, STORE_POINTER_action_name(an), desc);
    }
}

void RTActions::compilation_agent(compilation_subtask *t) {
    action_name *an = RETRIEVE_POINTER_action_name(t->data);
    package_request *pack = RTActions::package(an);
    Compile action ID8.1;
    Compile double-sharp constant8.2;
    Compile miscellaneous metadata8.3;
    if (SharedVariables::set_empty(an->action_variables) == FALSE)
        Compile creator function for shared variables8.4;
    Compile the performance function8.5;
    Compile the debugging function8.6;
}

§8.1. Compile action ID8.1 =

    inter_name *iname = Hierarchy::make_iname_in(ACTION_ID_HL, pack);
    Emit::numeric_constant(iname, 0);  placeholder, corrected in linking

• This code is used in §8.

§8.2. Compile double-sharp constant8.2 =

    inter_name *ds_iname = RTActions::double_sharp(an);
    Emit::unchecked_numeric_constant(ds_iname, (inter_ti) an->allocation_id);
    Hierarchy::make_available(ds_iname);

• This code is used in §8.

§8.3. Compile miscellaneous metadata8.3 =

    Hierarchy::apply_metadata_from_wording(pack, ACTION_NAME_MD_HL,
        an->compilation_data.metadata_name);
    Hierarchy::apply_metadata_from_raw_wording(pack, ACTION_PAST_NAME_MD_HL,
        an->naming_data.past_name);
    Hierarchy::apply_metadata_from_number(pack, ACTION_AT_MD_HL,
        (inter_ti) Wordings::first_wn(an->compilation_data.metadata_name));
    Emit::numeric_constant(RTActions::variables_id(an), 0);
    if (Str::get_first_char(RTActions::identifier(an)) == '_')
        Hierarchy::apply_metadata_from_number(pack, NO_CODING_MD_HL, 1);
    inter_name *dsc = Hierarchy::make_iname_in(ACTION_DSHARP_MD_HL, pack);
    Emit::iname_constant(dsc, K_value, RTActions::double_sharp(an));
    Hierarchy::apply_metadata_from_number(pack,
        OUT_OF_WORLD_MD_HL, (inter_ti) ActionSemantics::is_out_of_world(an));
    Hierarchy::apply_metadata_from_number(pack,
        REQUIRES_LIGHT_MD_HL, (inter_ti) ActionSemantics::requires_light(an));
    Hierarchy::apply_metadata_from_number(pack,
        CAN_HAVE_NOUN_MD_HL, (inter_ti) ActionSemantics::can_have_noun(an));
    Hierarchy::apply_metadata_from_number(pack,
        CAN_HAVE_SECOND_MD_HL, (inter_ti) ActionSemantics::can_have_second(an));
    Hierarchy::apply_metadata_from_number(pack,
        NOUN_ACCESS_MD_HL, (inter_ti) ActionSemantics::noun_access(an));
    Hierarchy::apply_metadata_from_number(pack,
        SECOND_ACCESS_MD_HL, (inter_ti) ActionSemantics::second_access(an));
    inter_name *kn_iname = Hierarchy::make_iname_in(NOUN_KIND_MD_HL, pack);
    RTKindIDs::define_constant_as_strong_id(kn_iname, ActionSemantics::kind_of_noun(an));
    inter_name *ks_iname = Hierarchy::make_iname_in(SECOND_KIND_MD_HL, pack);
    RTKindIDs::define_constant_as_strong_id(ks_iname, ActionSemantics::kind_of_second(an));
    wording SW = Node::get_text(an->compilation_data.designers_specification);
    if (Wordings::nonempty(SW))
        Hierarchy::apply_metadata_from_wording(pack, ACTION_SPECIFICATION_MD_HL, SW);
    if (an->compilation_data.an_specification_text_word >= 0)
        Hierarchy::apply_metadata_from_wording(pack, ACTION_DESCRIPTION_MD_HL,
            Wordings::one_word(an->compilation_data.an_specification_text_word));

    heading *definition_area = Headings::of_wording(ActionNameNames::tensed(an, IS_TENSE));
    inform_extension *this_extension =
        Headings::get_extension_containing(definition_area);
    if (this_extension == NULL) {
        Hierarchy::apply_metadata(pack,
            ACTION_INDEX_HEADING_MD_HL, I"Defined in the source");
    } else if (Extensions::is_standard(this_extension)) {
        TEMPORARY_TEXT(credit)
        WRITE_TO(credit, "From the extension ");
        Extensions::write_name_to_file(this_extension, credit);
        Hierarchy::apply_metadata(pack, ACTION_INDEX_HEADING_MD_HL, credit);
        DISCARD_TEXT(credit)
    } else {
        TEMPORARY_TEXT(credit)
        WRITE_TO(credit, "From the extension ");
        Extensions::write_name_to_file(this_extension, credit);
        WRITE_TO(credit, " by ");
        Extensions::write_author_to_file(this_extension, credit);
        Hierarchy::apply_metadata(pack, ACTION_INDEX_HEADING_MD_HL, credit);
        DISCARD_TEXT(credit)
    }
    TEMPORARY_TEXT(subh)
    wording W = Headings::get_text(definition_area);
    if ((this_extension) && (Extensions::is_standard(this_extension) == FALSE)) {
        WRITE_TO(subh, "Miscellaneous");
    } else if (Wordings::nonempty(W)) {
        RTPhrasebook::index_definition_area(subh, W, TRUE);
    } else {
        WRITE_TO(subh, "New actions");
    }
    Hierarchy::apply_metadata(pack, ACTION_INDEX_SUBHEADING_MD_HL, subh);
    DISCARD_TEXT(subh)

    TEMPORARY_TEXT(disp)
    int j = Wordings::first_wn(ActionNameNames::tensed(an, IS_TENSE));
    int somethings = 0;
    while (j <= Wordings::last_wn(ActionNameNames::tensed(an, IS_TENSE))) {
        if (<object-pronoun>(Wordings::one_word(j))) {
            RTActions::print_something(disp, an, somethings++);
        } else {
            WRITE_TO(disp, "%+W ", Wordings::one_word(j));
        }
        j++;
    }
    if (somethings < ActionSemantics::max_parameters(an))
        RTActions::print_something(disp, an, somethings++);
    Hierarchy::apply_metadata(pack, ACTION_DISPLAY_NAME_MD_HL, disp);
    DISCARD_TEXT(disp)

    RTActions::write_shared_variable_metadata(pack, an->action_variables);

    Hierarchy::apply_metadata_from_iname(pack, ACTION_CHECK_MD_HL,
        RTRulebooks::id_iname(an->check_rules));
    Hierarchy::apply_metadata_from_iname(pack, ACTION_CARRY_OUT_MD_HL,
        RTRulebooks::id_iname(an->carry_out_rules));
    Hierarchy::apply_metadata_from_iname(pack, ACTION_REPORT_MD_HL,
        RTRulebooks::id_iname(an->report_rules));

• This code is used in §8.

§8.4. Compile creator function for shared variables8.4 =

    inter_name *iname = Hierarchy::make_iname_in(ACTION_STV_CREATOR_FN_HL, pack);
    RTSharedVariables::compile_creator_fn(an->action_variables, iname);
    inter_name *vc = Hierarchy::make_iname_in(ACTION_VARC_MD_HL, pack);
    Emit::iname_constant(vc, K_value, iname);

• This code is used in §8.

§8.5. The "perform" function for an action, typically called something like TakeSub, consists only of a call to a generic action-performing function; that function takes our three rulebooks as arguments.

Compile the performance function8.5 =

    packaging_state save = Functions::begin(RTActions::Sub(an));
    EmitCode::inv(RETURN_BIP);
    EmitCode::down();
        inter_name *generic_iname = Hierarchy::find(GENERICVERBSUB_HL);
        EmitCode::call(generic_iname);
        EmitCode::down();
            EmitCode::val_iname(K_value, RTRulebooks::id_iname(an->check_rules));
            EmitCode::val_iname(K_value, RTRulebooks::id_iname(an->carry_out_rules));
            EmitCode::val_iname(K_value, RTRulebooks::id_iname(an->report_rules));
        EmitCode::up();
    EmitCode::up();
    Functions::end(save);

• This code is used in §8.

§8.6. The "debugging" function is used by the ACTIONS debugging command, and prints a description of the current action, on the assumption that the action name is the function is attached to.

Compile the debugging function8.6 =

    inter_name *iname = Hierarchy::derive_iname_in(DEBUG_ACTION_FN_HL,
        RTActions::base_iname(an), pack);
    Hierarchy::apply_metadata_from_iname(pack, DEBUG_ACTION_MD_HL, iname);
    packaging_state save = Functions::begin(iname);
    inter_symbol *n_s = LocalVariables::new_other_as_symbol(I"n");
    inter_symbol *s_s = LocalVariables::new_other_as_symbol(I"s");
    inter_symbol *for_say_s = LocalVariables::new_other_as_symbol(I"for_say");

    int j = Wordings::first_wn(ActionNameNames::tensed(an, IS_TENSE)),
        j0 = -1, somethings = 0, clc = 0;
    while (j <= Wordings::last_wn(ActionNameNames::tensed(an, IS_TENSE))) {
        if (<object-pronoun>(Wordings::one_word(j))) {
            if (j0 >= 0) {
                Insert a space here if needed to break up the action name8.6.1;

                TEMPORARY_TEXT(AT)
                RTActions::print_action_text_to(Wordings::new(j0, j-1),
                    Wordings::first_wn(ActionNameNames::tensed(an, IS_TENSE)), AT);
                EmitCode::inv(PRINT_BIP);
                EmitCode::down();
                    EmitCode::val_text(AT);
                EmitCode::up();
                DISCARD_TEXT(AT)

                j0 = -1;
            }
            Insert a space here if needed to break up the action name8.6.1;
            EmitCode::inv(IFELSE_BIP);
            EmitCode::down();
                EmitCode::inv(EQ_BIP);
                EmitCode::down();
                    EmitCode::val_symbol(K_value, for_say_s);
                    EmitCode::val_number(2);
                EmitCode::up();
                EmitCode::code();
                EmitCode::down();
                    EmitCode::inv(PRINT_BIP);
                    EmitCode::down();
                        EmitCode::val_text(I"it");
                    EmitCode::up();
                EmitCode::up();
                EmitCode::code();
                EmitCode::down();
                    RTActions::print_noun_or_second(an, somethings++, n_s, s_s);
                EmitCode::up();
            EmitCode::up();
        } else {
            if (j0<0) j0 = j;
        }
        j++;
    }
    if (j0 >= 0) {
        Insert a space here if needed to break up the action name8.6.1;
        TEMPORARY_TEXT(AT)
        RTActions::print_action_text_to(Wordings::new(j0, j-1),
            Wordings::first_wn(ActionNameNames::tensed(an, IS_TENSE)), AT);
        EmitCode::inv(PRINT_BIP);
        EmitCode::down();
            EmitCode::val_text(AT);
        EmitCode::up();
        DISCARD_TEXT(AT)
    }
    if (somethings < ActionSemantics::max_parameters(an)) {
        EmitCode::inv(IF_BIP);
        EmitCode::down();
            EmitCode::inv(NE_BIP);
            EmitCode::down();
                EmitCode::val_symbol(K_value, for_say_s);
                EmitCode::val_number(2);
            EmitCode::up();
            EmitCode::code();
            EmitCode::down();
                Insert a space here if needed to break up the action name8.6.1;
                RTActions::print_noun_or_second(an, somethings++, n_s, s_s);
            EmitCode::up();
        EmitCode::up();
    }
    Functions::end(save);

• This code is used in §8.

§8.6.1. Insert a space here if needed to break up the action name8.6.1 =

    if (clc++ > 0) {
        EmitCode::inv(PRINT_BIP);
        EmitCode::down();
            EmitCode::val_text(I" ");
        EmitCode::up();
    }

• This code is used in §8.6 (four times).

§9. And that uses these little utilities:

void RTActions::print_action_text_to?Usage of RTActions::print_action_text_to:
§8.6(wording W, int start, OUTPUT_STREAM) {
    if (Wordings::first_wn(W) == start) {
        WRITE("%W", Wordings::first_word(W));
        W = Wordings::trim_first_word(W);
        if (Wordings::empty(W)) return;
        WRITE(" ");
    }
    WRITE("%+W", W);
}

void RTActions::print_noun_or_second?Usage of RTActions::print_noun_or_second:
§8.6(action_name *an, int n, inter_symbol *n_s, inter_symbol *s_s) {
    kind *K = (n == 0)?ActionSemantics::kind_of_noun(an):ActionSemantics::kind_of_second(an);
    inter_symbol *var = (n == 0)?n_s:s_s;
    inter_name *pfn = RTKindConstructors::printing_fn_iname(K);
    if (Kinds::Behaviour::is_object(K))
        pfn = Hierarchy::find(DA_NAME_HL);
    else
        var = InterNames::to_symbol(Hierarchy::find(PARSED_NUMBER_HL));
    EmitCode::inv(INDIRECT1V_BIP);
    EmitCode::down();
        EmitCode::val_iname(K_value, pfn);
        if ((K_understanding) && (Kinds::eq(K, K_understanding))) {
            EmitCode::inv(PLUS_BIP);
            EmitCode::down();
                EmitCode::inv(TIMES_BIP);
                EmitCode::down();
                    EmitCode::val_number(100);
                    EmitCode::val_iname(K_number, Hierarchy::find(CONSULT_FROM_HL));
                EmitCode::up();
                EmitCode::val_iname(K_number, Hierarchy::find(CONSULT_WORDS_HL));
            EmitCode::up();
        } else {
            EmitCode::val_symbol(K_value, var);
        }
    EmitCode::up();
}

void RTActions::print_something?Usage of RTActions::print_something:
§8.3(OUTPUT_STREAM, action_name *an, int argc) {
    kind *K = NULL;  redundant assignment to appease gcc -O2
    HTML::begin_span(OUT, I"indexdullblue");
    if (argc == 0) K = ActionSemantics::kind_of_noun(an);
    if (argc == 1) K = ActionSemantics::kind_of_second(an);
    if (Kinds::Behaviour::is_object(K)) WRITE("something");
    else if ((K_understanding) && (Kinds::eq(K, K_understanding))) WRITE("some text");
    else Kinds::Textual::write(OUT, K);
    HTML::end_span(OUT);
    WRITE(" ");
}

void RTActions::write_shared_variable_metadata?Usage of RTActions::write_shared_variable_metadata:
§8.3(package_request *R, shared_variable_set *set) {
    shared_variable *shv;
    LOOP_OVER_LINKED_LIST(shv, shared_variable, set->variables) {
        nonlocal_variable *nlv = SharedVariables::get_variable(shv);
        package_request *sv = Hierarchy::package_within(ACTION_VARIABLES_HAP, R);

        Hierarchy::apply_metadata_from_raw_wording(sv, ACTION_VAR_NAME_MD_HL, nlv->name);
        Hierarchy::apply_metadata_from_number(sv, ACTION_VAR_AT_MD_HL,
            (inter_ti) Wordings::first_wn(nlv->name));
        if (Wordings::nonempty(nlv->var_documentation_symbol)) {
            TEMPORARY_TEXT(ixt)
            WRITE_TO(ixt, "%+W", Wordings::one_word(Wordings::first_wn(nlv->var_documentation_symbol)));
            Hierarchy::apply_metadata(sv, ACTION_VAR_DOCUMENTATION_MD_HL, ixt);
            DISCARD_TEXT(ixt)
        }
        TEMPORARY_TEXT(vk)
        Kinds::Textual::write(vk, nlv->nlv_kind);
        Hierarchy::apply_metadata(sv, ACTION_VAR_KIND_MD_HL, vk);
        DISCARD_TEXT(vk)
    }
}