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62 lines
2.2 KiB
OpenEdge ABL
62 lines
2.2 KiB
OpenEdge ABL
[SocketInstruction::] The Socket Construct.
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Defining the socket 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 SocketInstruction::define_construct(void) {
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inter_construct *IC = InterInstruction::create_construct(SOCKET_IST, I"socket");
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InterInstruction::specify_syntax(IC, I"socket IDENTIFIER TOKENS");
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METHOD_ADD(IC, CONSTRUCT_READ_MTID, SocketInstruction::read);
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METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, SocketInstruction::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 SocketInstruction::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"SOCKET_IST structures cannot exist", NULL);
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}
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@ What it does is to specify a symbol which is a socket 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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For how these are printed back, see //PlugInstruction::write_declaration//,
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which handles both plugs and sockets.
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=
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void SocketInstruction::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 *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 *socket_s = TextualInter::new_symbol(eloc, T, symbol_text, E);
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if (*E) return;
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text_stream *equate_name = NULL;
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match_results mr = Regexp::create_mr();
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if (Regexp::match(&mr, equate_text, U"~~> \"(%C+)\"")) {
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*E = InterErrors::plain(I"a socket cannot wire to a name", eloc);
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return;
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} else if (Regexp::match(&mr, equate_text, U"~~> (%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 socket syntax", eloc); return;
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}
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inter_symbol *eq = InterSymbolsTable::URL_to_symbol(I, equate_name);
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if (eq == NULL) {
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InterSymbol::make_socket(socket_s);
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Wiring::wire_to_name(socket_s, equate_name);
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} else {
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Wiring::make_socket_to(socket_s, eq);
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}
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Regexp::dispose_of(&mr);
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}
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