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86 lines
3.5 KiB
OpenEdge ABL
86 lines
3.5 KiB
OpenEdge ABL
[AppendInstruction::] The Append Construct.
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Defining the append construct.
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@h Definition.
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For what this does and why it is used, see //inter: Data Packages in Textual Inter//.
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But please use it as little as possible: in an ideal world it would be abolished.
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=
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void AppendInstruction::define_construct(void) {
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inter_construct *IC = InterInstruction::create_construct(APPEND_IST, I"append");
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InterInstruction::specify_syntax(IC, I"append IDENTIFIER TEXT");
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InterInstruction::data_extent_always(IC, 2);
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InterInstruction::permit(IC, INSIDE_PLAIN_PACKAGE_ICUP);
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METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, AppendInstruction::verify);
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METHOD_ADD(IC, CONSTRUCT_TRANSPOSE_MTID, AppendInstruction::transpose);
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METHOD_ADD(IC, CONSTRUCT_READ_MTID, AppendInstruction::read);
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METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, AppendInstruction::write);
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}
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@h Instructions.
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In bytecode, the frame of an |append| instruction is laid out with the
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compulsory words -- see //Inter Nodes// -- followed by:
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@d SYMBOL_APPEND_IFLD (DATA_IFLD + 0)
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@d CONTENT_APPEND_IFLD (DATA_IFLD + 1)
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=
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inter_error_message *AppendInstruction::new(inter_bookmark *IBM, inter_symbol *S,
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text_stream *append_text, inter_ti level, struct inter_error_location *eloc) {
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inter_tree_node *P = Inode::new_with_2_data_fields(IBM, APPEND_IST,
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/* SYMBOL_APPEND_IFLD: */ InterSymbolsTable::id_at_bookmark(IBM, S),
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/* CONTENT_APPEND_IFLD: */ InterWarehouse::create_text_at(IBM, append_text),
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eloc, level);
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inter_error_message *E = VerifyingInter::instruction(InterBookmark::package(IBM), P);
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if (E) return E;
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NodePlacement::move_to_moving_bookmark(P, IBM);
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return NULL;
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}
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void AppendInstruction::transpose(inter_construct *IC, inter_tree_node *P,
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inter_ti *grid, inter_ti grid_extent, inter_error_message **E) {
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P->W.instruction[CONTENT_APPEND_IFLD] = grid[P->W.instruction[CONTENT_APPEND_IFLD]];
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}
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@ Verification consists of sanity checks followed by some cross-referencing.
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=
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void AppendInstruction::verify(inter_construct *IC, inter_tree_node *P,
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inter_package *owner, inter_error_message **E) {
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*E = VerifyingInter::SID_field(owner, P, SYMBOL_APPEND_IFLD, INVALID_IST);
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if (*E) return;
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*E = VerifyingInter::text_field(owner, P, CONTENT_APPEND_IFLD);
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if (*E) return;
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inter_symbol *S = InterSymbolsTable::symbol_from_ID_at_node(P, SYMBOL_APPEND_IFLD);
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text_stream *content = Inode::ID_to_text(P, P->W.instruction[CONTENT_APPEND_IFLD]);
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SymbolAnnotation::set_t(P->tree, P->package, S, APPEND_IANN, content);
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}
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@h Creating from textual Inter syntax.
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=
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void AppendInstruction::read(inter_construct *IC, inter_bookmark *IBM, inter_line_parse *ilp,
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inter_error_location *eloc, inter_error_message **E) {
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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);
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if (S == NULL) { *E = InterErrors::quoted(I"no such identifier", identifier, eloc); return; }
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TEMPORARY_TEXT(raw)
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*E = TextualInter::parse_literal_text(raw, content, 0, Str::len(content), eloc);
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if (*E == NULL) *E = AppendInstruction::new(IBM, S, raw, (inter_ti) ilp->indent_level, eloc);
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DISCARD_TEXT(content)
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}
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@h Writing to textual Inter syntax.
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=
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void AppendInstruction::write(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P) {
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inter_symbol *S = InterSymbolsTable::symbol_from_ID_at_node(P, SYMBOL_APPEND_IFLD);
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text_stream *content = Inode::ID_to_text(P, P->W.instruction[CONTENT_APPEND_IFLD]);
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WRITE("append %S ", InterSymbol::identifier(S));
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TextualInter::write_text(OUT, content);
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}
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