Defining the pragma 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 PragmaInstruction::define_construct?Usage of PragmaInstruction::define_construct:
Inter Constructs - §15(void) {
    inter_construct *IC = InterInstruction::create_construct(PRAGMA_IST, I"pragma");
    InterInstruction::specify_syntax(IC, I"pragma IDENTIFIER TEXT");
    InterInstruction::data_extent_always(IC, 2);
    InterInstruction::permit(IC, OUTSIDE_OF_PACKAGES_ICUP);
    METHOD_ADD(IC, CONSTRUCT_READ_MTID, PragmaInstruction::read);
    METHOD_ADD(IC, CONSTRUCT_TRANSPOSE_MTID, PragmaInstruction::transpose);
    METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, PragmaInstruction::verify);
    METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, PragmaInstruction::write);
}

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

define TARGET_PRAGMA_IFLD (DATA_IFLD + 0)
define TEXT_PRAGMA_IFLD   (DATA_IFLD + 1)

inter_error_message *PragmaInstruction::new?Usage of PragmaInstruction::new:
§4(inter_bookmark *IBM, text_stream *target_name,
    text_stream *content, inter_ti level, struct inter_error_location *eloc) {
    inter_tree_node *P = Inode::new_with_2_data_fields(IBM, PRAGMA_IST,
        /* TARGET_PRAGMA_IFLD: */ InterWarehouse::create_text_at(IBM, target_name),
        /* TEXT_PRAGMA_IFLD: */   InterWarehouse::create_text_at(IBM, content),
        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;
}

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

§3. Verification consists only of sanity checks.

void PragmaInstruction::verify?Usage of PragmaInstruction::verify:
§1(inter_construct *IC, inter_tree_node *P,
    inter_package *owner, inter_error_message **E) {
    *E = VerifyingInter::text_field(owner, P, TARGET_PRAGMA_IFLD);
    if (*E) return;
    *E = VerifyingInter::text_field(owner, P, TEXT_PRAGMA_IFLD);
    if (*E) return;
}

§4. Creating from textual Inter syntax. Note that the target name should be an identifier-like name, without quotes; whereas the content is parsed as a double-quoted literal.

void PragmaInstruction::read?Usage of PragmaInstruction::read:
§1(inter_construct *IC, inter_bookmark *IBM, inter_line_parse *ilp,
    inter_error_location *eloc, inter_error_message **E) {
    text_stream *target_name = ilp->mr.exp[0];
    text_stream *content_token = ilp->mr.exp[1];
    TEMPORARY_TEXT(raw)
    *E = TextualInter::parse_literal_text(raw, content_token, 0, Str::len(content_token), eloc);
    if (*E == NULL)
        *E = PragmaInstruction::new(IBM, target_name, raw, (inter_ti) ilp->indent_level, eloc);
    DISCARD_TEXT(raw)
}

§5. Writing to textual Inter syntax.

void PragmaInstruction::write?Usage of PragmaInstruction::write:
§1(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P) {
    WRITE("pragma %S ", PragmaInstruction::target(P));
    TextualInter::write_text(OUT, PragmaInstruction::content(P));
}

§6. Access functions.

text_stream *PragmaInstruction::target?Usage of PragmaInstruction::target:
§5(inter_tree_node *P) {
    if (P == NULL) return NULL;
    if (Inode::isnt(P, PRAGMA_IST)) return NULL;
    return Inode::ID_to_text(P, P->W.instruction[TARGET_PRAGMA_IFLD]);
}

text_stream *PragmaInstruction::content?Usage of PragmaInstruction::content:
§5(inter_tree_node *P) {
    if (P == NULL) return NULL;
    if (Inode::isnt(P, PRAGMA_IST)) return NULL;
    return Inode::ID_to_text(P, P->W.instruction[TEXT_PRAGMA_IFLD]);
}