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88 lines
3 KiB
OpenEdge ABL
88 lines
3 KiB
OpenEdge ABL
[OriginInstruction::] The Origin Construct.
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Defining the origin construct.
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@h Definition.
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For what this does and why it is used, see //inter: Textual Inter//.
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=
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void OriginInstruction::define_construct(void) {
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inter_construct *IC = InterInstruction::create_construct(ORIGIN_IST, I"origin");
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InterInstruction::defines_symbol_in_fields(IC, DEFN_ORIGIN_IFLD, -1);
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InterInstruction::specify_syntax(IC, I"origin @IDENTIFIER TEXT");
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InterInstruction::data_extent_at_least(IC, 2);
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InterInstruction::permit(IC, OUTSIDE_OF_PACKAGES_ICUP);
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METHOD_ADD(IC, CONSTRUCT_READ_MTID, OriginInstruction::read);
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METHOD_ADD(IC, CONSTRUCT_TRANSPOSE_MTID, OriginInstruction::transpose);
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METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, OriginInstruction::verify);
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METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, OriginInstruction::write);
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}
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@h Instructions.
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In bytecode, the frame of a |primitive| instruction is laid out with the
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compulsory words -- see //Inter Nodes// -- followed by two words:
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@d DEFN_ORIGIN_IFLD (DATA_IFLD + 0)
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@d FILENAME_ORIGIN_IFLD (DATA_IFLD + 1)
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=
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inter_error_message *OriginInstruction::new(inter_bookmark *IBM, inter_symbol *orig_name,
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text_stream *file, inter_ti level, inter_error_location *eloc) {
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inter_tree_node *F = Inode::new_with_2_data_fields(IBM, ORIGIN_IST,
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/* DEFN_ORIGIN_IFLD: */ InterSymbolsTable::id_at_bookmark(IBM, orig_name),
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/* FILENAME_ORIGIN_IFLD: */ InterWarehouse::create_text_at(IBM, file),
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eloc, level);
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inter_error_message *E = VerifyingInter::instruction(InterBookmark::package(IBM), F);
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if (E) return E;
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NodePlacement::move_to_moving_bookmark(F, IBM);
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return NULL;
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}
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void OriginInstruction::transpose(inter_construct *IC, inter_tree_node *P, inter_ti *grid,
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inter_ti grid_extent, inter_error_message **E) {
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P->W.instruction[FILENAME_ORIGIN_IFLD] = grid[P->W.instruction[FILENAME_ORIGIN_IFLD]];
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}
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@ Verification consists only of sanity checks.
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=
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void OriginInstruction::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::text_field(owner, P, FILENAME_ORIGIN_IFLD);
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if (*E) return;
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}
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@h Creating from textual Inter syntax.
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=
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void OriginInstruction::read(inter_construct *IC, inter_bookmark *IBM,
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inter_line_parse *ilp, inter_error_location *eloc, inter_error_message **E) {
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inter_symbol *orig_name =
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TextualInter::new_symbol(eloc, InterBookmark::scope(IBM), ilp->mr.exp[0], E);
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if (*E) return;
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*E = OriginInstruction::new(IBM, orig_name, ilp->mr.exp[1],
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(inter_ti) ilp->indent_level, eloc);
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}
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@h Writing to textual Inter syntax.
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=
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void OriginInstruction::write(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P) {
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inter_symbol *orig_name = InterSymbolsTable::symbol_from_ID_at_node(P, DEFN_ORIGIN_IFLD);
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WRITE("origin @%S", InterSymbol::identifier(orig_name));
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WRITE(" ");
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TextualInter::write_text(OUT, OriginInstruction::filename(P));
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}
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@h Access functions.
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=
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text_stream *OriginInstruction::filename(inter_tree_node *P) {
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if (P == NULL) return NULL;
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if (Inode::isnt(P, ORIGIN_IST)) return NULL;
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return Inode::ID_to_text(P, P->W.instruction[FILENAME_ORIGIN_IFLD]);
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}
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