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87 lines
3 KiB
OpenEdge ABL
87 lines
3 KiB
OpenEdge ABL
[PlugInstruction::] The Plug Construct.
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Defining the symbol construct.
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@ This is a pseudo-construct: it looks like an instruction in textual Inter
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syntax, but specifies something else, and does not result in an |inter_tree_node|.
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=
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void PlugInstruction::define_construct(void) {
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inter_construct *IC = InterInstruction::create_construct(PLUG_IST, I"plug");
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InterInstruction::specify_syntax(IC, I"plug IDENTIFIER TOKENS");
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METHOD_ADD(IC, CONSTRUCT_READ_MTID, PlugInstruction::read);
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METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, PlugInstruction::verify);
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InterInstruction::allow_in_depth_range(IC, 0, 1);
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InterInstruction::permit(IC, INSIDE_PLAIN_PACKAGE_ICUP);
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}
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void PlugInstruction::verify(inter_construct *IC, inter_tree_node *P,
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inter_package *owner, inter_error_message **E) {
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*E = Inode::error(P, I"PLUG_IST structures cannot exist", NULL);
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}
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@ What it does is to specify a symbol which is a plug in the current tree:
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this results in an entry in the symbols table for the current package (which
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will always be |/main/connectors|, in fact) but not an instruction.
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Surprisingly, this can actually result in a socket rather than a plug, but
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only in the case where the plug asks to wire to something existing in the current
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tree already.
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=
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void PlugInstruction::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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text_stream *symbol_text = ilp->mr.exp[0];
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text_stream *equate_text = ilp->mr.exp[1];
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inter_tree *I = InterBookmark::tree(IBM);
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inter_symbols_table *T = InterBookmark::scope(IBM);
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inter_symbol *plug_s = TextualInter::new_symbol(eloc, T, symbol_text, E);
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if (*E) return;
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InterSymbol::make_plug(plug_s);
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text_stream *equate_name = NULL;
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int to_name = FALSE;
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match_results mr = Regexp::create_mr();
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if (Regexp::match(&mr, equate_text, L"~~> \"(%C+)\"")) {
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equate_name = mr.exp[0];
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to_name = TRUE;
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} else if (Regexp::match(&mr, equate_text, L"~~> (%C+)")) {
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equate_name = mr.exp[0];
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} else {
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Regexp::dispose_of(&mr);
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*E = InterErrors::plain(I"bad plug syntax", eloc); return;
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}
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if (to_name) {
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Wiring::make_plug_wanting_identifier(plug_s, equate_name);
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} else {
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inter_symbol *eq_s = InterSymbolsTable::URL_to_symbol(I, equate_name);
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if (eq_s == NULL) Wiring::wire_to_name(plug_s, equate_name);
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else Wiring::make_socket_to(plug_s, eq_s);
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}
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Regexp::dispose_of(&mr);
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}
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@ The following writes a valid line of textual Inter to declare a plug or socket,
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appearing at level |N| in the hierarchy.
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=
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void PlugInstruction::write_declaration(OUTPUT_STREAM, inter_symbol *S, int N) {
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for (int L=0; L<N; L++) WRITE("\t");
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switch (InterSymbol::get_type(S)) {
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case PLUG_ISYMT: WRITE("plug"); break;
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case SOCKET_ISYMT: WRITE("socket"); break;
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default: internal_error("not a connector"); break;
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}
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WRITE(" %S", InterSymbol::identifier(S));
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if (Wiring::is_wired_to_name(S)) {
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WRITE(" ~~> \"%S\"", Wiring::wired_to_name(S));
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} else if (Wiring::is_wired(S)) {
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WRITE(" ~~> ");
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InterSymbolsTable::write_symbol_URL(OUT, Wiring::wired_to(S));
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} else {
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WRITE(" ?");
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}
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}
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