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Defining the append construct.

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§1. Definition. For what this does and why it is used, see Data Packages in Textual Inter (in inter). -But please use it as little as possible: in an ideal world it would be abolished. -

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-void AppendInstruction::define_construct(void) {
-    inter_construct *IC = InterInstruction::create_construct(APPEND_IST, I"append");
-    InterInstruction::specify_syntax(IC, I"append IDENTIFIER TEXT");
-    InterInstruction::data_extent_always(IC, 2);
-    InterInstruction::permit(IC, INSIDE_PLAIN_PACKAGE_ICUP);
-    METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, AppendInstruction::verify);
-    METHOD_ADD(IC, CONSTRUCT_TRANSPOSE_MTID, AppendInstruction::transpose);
-    METHOD_ADD(IC, CONSTRUCT_READ_MTID, AppendInstruction::read);
-    METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, AppendInstruction::write);
-}
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§2. Instructions. In bytecode, the frame of an append instruction is laid out with the -compulsory words — see Inter Nodes — followed by: -

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define SYMBOL_APPEND_IFLD  (DATA_IFLD + 0)
-define CONTENT_APPEND_IFLD (DATA_IFLD + 1)
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-inter_error_message *AppendInstruction::new(inter_bookmark *IBM, inter_symbol *S,
-    text_stream *append_text, inter_ti level, struct inter_error_location *eloc) {
-    inter_tree_node *P = Inode::new_with_2_data_fields(IBM, APPEND_IST,
-        /* SYMBOL_APPEND_IFLD:  */ InterSymbolsTable::id_at_bookmark(IBM, S),
-        /* CONTENT_APPEND_IFLD: */ InterWarehouse::create_text_at(IBM, append_text),
-        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;
-}
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-void AppendInstruction::transpose(inter_construct *IC, inter_tree_node *P,
-    inter_ti *grid, inter_ti grid_extent, inter_error_message **E) {
-    P->W.instruction[CONTENT_APPEND_IFLD] = grid[P->W.instruction[CONTENT_APPEND_IFLD]];
-}
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§3. Verification consists of sanity checks followed by some cross-referencing. -

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-void AppendInstruction::verify(inter_construct *IC, inter_tree_node *P,
-    inter_package *owner, inter_error_message **E) {
-    *E = VerifyingInter::SID_field(owner, P, SYMBOL_APPEND_IFLD, INVALID_IST);
-    if (*E) return;
-    *E = VerifyingInter::text_field(owner, P, CONTENT_APPEND_IFLD);
-    if (*E) return;
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-    inter_symbol *S = InterSymbolsTable::symbol_from_ID_at_node(P, SYMBOL_APPEND_IFLD);
-    text_stream *content = Inode::ID_to_text(P, P->W.instruction[CONTENT_APPEND_IFLD]);
-    SymbolAnnotation::set_t(P->tree, P->package, S, APPEND_IANN, content);
-}
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§4. Creating from textual Inter syntax.

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-void AppendInstruction::read(inter_construct *IC, inter_bookmark *IBM, inter_line_parse *ilp,
-    inter_error_location *eloc, inter_error_message **E) {
-    text_stream *identifier = ilp->mr.exp[0], *content = ilp->mr.exp[1];
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-    inter_symbol *S = InterSymbolsTable::symbol_from_name(InterBookmark::scope(IBM), identifier);
-    if (S == NULL) { *E = InterErrors::quoted(I"no such identifier", identifier, eloc); return; }
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-    TEMPORARY_TEXT(raw)
-    *E = TextualInter::parse_literal_text(raw, content, 0, Str::len(content), eloc);
-    if (*E == NULL) *E = AppendInstruction::new(IBM, S, raw, (inter_ti) ilp->indent_level, eloc);
-    DISCARD_TEXT(content)
-}
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§5. Writing to textual Inter syntax.

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-void AppendInstruction::write(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P) {
-    inter_symbol *S = InterSymbolsTable::symbol_from_ID_at_node(P, SYMBOL_APPEND_IFLD);
-    text_stream *content = Inode::ID_to_text(P, P->W.instruction[CONTENT_APPEND_IFLD]);
-    WRITE("append %S ", InterSymbol::identifier(S));
-    TextualInter::write_text(OUT, content);
-}
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