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89 lines
3.1 KiB
OpenEdge ABL
89 lines
3.1 KiB
OpenEdge ABL
[LocalInstruction::] The Local Construct.
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Defining the local 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 LocalInstruction::define_construct(void) {
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inter_construct *IC = InterInstruction::create_construct(LOCAL_IST, I"local");
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InterInstruction::defines_symbol_in_fields(IC, DEFN_LOCAL_IFLD, TYPE_LOCAL_IFLD);
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InterInstruction::specify_syntax(IC, I"local TOKENS");
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InterInstruction::data_extent_always(IC, 2);
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InterInstruction::permit(IC, INSIDE_CODE_PACKAGE_ICUP);
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METHOD_ADD(IC, CONSTRUCT_READ_MTID, LocalInstruction::read);
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METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, LocalInstruction::verify);
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METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, LocalInstruction::write);
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}
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@h Instructions.
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In bytecode, the frame of a |local| instruction is laid out with the
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compulsory words -- see //Inter Nodes// -- followed by:
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@d DEFN_LOCAL_IFLD (DATA_IFLD + 0)
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@d TYPE_LOCAL_IFLD (DATA_IFLD + 1)
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=
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inter_error_message *LocalInstruction::new(inter_bookmark *IBM, inter_symbol *variable_s,
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inter_type var_type, inter_ti level, inter_error_location *eloc) {
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inter_tree_node *P = Inode::new_with_2_data_fields(IBM, LOCAL_IST,
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/* DEFN_LOCAL_IFLD: */ InterSymbolsTable::id_at_bookmark(IBM, variable_s),
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/* TYPE_LOCAL_IFLD: */ InterTypes::to_TID_at(IBM, var_type),
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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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@ Verification consists only of sanity checks.
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=
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void LocalInstruction::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::TID_field(owner, P, TYPE_LOCAL_IFLD);
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}
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@h Creating from textual Inter syntax.
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=
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void LocalInstruction::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 *type_text = NULL, *name_text = ilp->mr.exp[0];
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inter_symbol *variable_s = NULL;
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match_results mr = Regexp::create_mr();
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if (Regexp::match(&mr, name_text, L"%((%c+)%) (%c+)")) {
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type_text = mr.exp[0]; name_text = mr.exp[1];
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}
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inter_symbols_table *T = InterBookmark::scope(IBM);
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inter_type var_type = InterTypes::parse_simple(T, eloc, type_text, E);
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if (*E == NULL) variable_s = TextualInter::new_symbol(eloc, T, name_text, E);
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Regexp::dispose_of(&mr);
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if (*E) return;
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InterSymbol::make_local(variable_s);
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SymbolAnnotation::copy_set_to_symbol(&(ilp->set), variable_s);
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*E = LocalInstruction::new(IBM, variable_s, var_type, (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 LocalInstruction::write(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P) {
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WRITE("local ");
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TextualInter::write_optional_type_marker(OUT, P, TYPE_LOCAL_IFLD);
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inter_symbol *variable_s = LocalInstruction::variable(P);
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WRITE("%S", InterSymbol::identifier(variable_s));
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}
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@h Access function.
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=
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inter_symbol *LocalInstruction::variable(inter_tree_node *P) {
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if (P == NULL) return NULL;
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if (Inode::isnt(P, LOCAL_IST)) return NULL;
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return InterSymbolsTable::symbol_from_ID_at_node(P, DEFN_LOCAL_IFLD);
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}
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