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95 lines
3.4 KiB
OpenEdge ABL
95 lines
3.4 KiB
OpenEdge ABL
[PragmaInstruction::] The Pragma Construct.
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Defining the pragma 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 PragmaInstruction::define_construct(void) {
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inter_construct *IC = InterInstruction::create_construct(PRAGMA_IST, I"pragma");
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InterInstruction::specify_syntax(IC, I"pragma IDENTIFIER TEXT");
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InterInstruction::data_extent_always(IC, 2);
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InterInstruction::permit(IC, OUTSIDE_OF_PACKAGES_ICUP);
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METHOD_ADD(IC, CONSTRUCT_READ_MTID, PragmaInstruction::read);
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METHOD_ADD(IC, CONSTRUCT_TRANSPOSE_MTID, PragmaInstruction::transpose);
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METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, PragmaInstruction::verify);
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METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, PragmaInstruction::write);
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}
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@h Instructions.
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In bytecode, the frame of a |pragma| instruction is laid out with the
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compulsory words -- see //Inter Nodes// -- followed by:
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@d TARGET_PRAGMA_IFLD (DATA_IFLD + 0)
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@d TEXT_PRAGMA_IFLD (DATA_IFLD + 1)
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=
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inter_error_message *PragmaInstruction::new(inter_bookmark *IBM, text_stream *target_name,
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text_stream *content, inter_ti level, struct inter_error_location *eloc) {
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inter_tree_node *P = Inode::new_with_2_data_fields(IBM, PRAGMA_IST,
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/* TARGET_PRAGMA_IFLD: */ InterWarehouse::create_text_at(IBM, target_name),
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/* TEXT_PRAGMA_IFLD: */ InterWarehouse::create_text_at(IBM, content),
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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 PragmaInstruction::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[TARGET_PRAGMA_IFLD] = grid[P->W.instruction[TARGET_PRAGMA_IFLD]];
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P->W.instruction[TEXT_PRAGMA_IFLD] = grid[P->W.instruction[TEXT_PRAGMA_IFLD]];
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}
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@ Verification consists only of sanity checks.
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=
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void PragmaInstruction::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, TARGET_PRAGMA_IFLD);
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if (*E) return;
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*E = VerifyingInter::text_field(owner, P, TEXT_PRAGMA_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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Note that the target name should be an identifier-like name, without quotes;
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whereas the content is parsed as a double-quoted literal.
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=
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void PragmaInstruction::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 *target_name = ilp->mr.exp[0];
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text_stream *content_token = ilp->mr.exp[1];
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TEMPORARY_TEXT(raw)
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*E = TextualInter::parse_literal_text(raw, content_token, 0, Str::len(content_token), eloc);
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if (*E == NULL)
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*E = PragmaInstruction::new(IBM, target_name, raw, (inter_ti) ilp->indent_level, eloc);
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DISCARD_TEXT(raw)
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}
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@h Writing to textual Inter syntax.
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=
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void PragmaInstruction::write(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P) {
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WRITE("pragma %S ", PragmaInstruction::target(P));
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TextualInter::write_text(OUT, PragmaInstruction::content(P));
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}
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@h Access functions.
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=
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text_stream *PragmaInstruction::target(inter_tree_node *P) {
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if (P == NULL) return NULL;
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if (Inode::isnt(P, PRAGMA_IST)) return NULL;
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return Inode::ID_to_text(P, P->W.instruction[TARGET_PRAGMA_IFLD]);
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}
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text_stream *PragmaInstruction::content(inter_tree_node *P) {
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if (P == NULL) return NULL;
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if (Inode::isnt(P, PRAGMA_IST)) return NULL;
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return Inode::ID_to_text(P, P->W.instruction[TEXT_PRAGMA_IFLD]);
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}
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