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186 lines
6.7 KiB
OpenEdge ABL
186 lines
6.7 KiB
OpenEdge ABL
[PropertyValueInstruction::] The PropertyValue Construct.
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Defining the propertyvalue 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 PropertyValueInstruction::define_construct(void) {
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inter_construct *IC = InterInstruction::create_construct(PROPERTYVALUE_IST, I"propertyvalue");
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InterInstruction::specify_syntax(IC, I"propertyvalue IDENTIFIER of IDENTIFIER = TOKENS");
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InterInstruction::data_extent_always(IC, 4);
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InterInstruction::permit(IC, INSIDE_PLAIN_PACKAGE_ICUP);
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METHOD_ADD(IC, CONSTRUCT_READ_MTID, PropertyValueInstruction::read);
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METHOD_ADD(IC, CONSTRUCT_TRANSPOSE_MTID, PropertyValueInstruction::transpose);
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METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, PropertyValueInstruction::verify);
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METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, PropertyValueInstruction::write);
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}
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@h Instructions.
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In bytecode, the frame of a |propertyvalue| instruction is laid out with the
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compulsory words -- see //Inter Nodes// -- followed by:
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@d PROP_PVAL_IFLD (DATA_IFLD + 0)
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@d OWNER_PVAL_IFLD (DATA_IFLD + 1)
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@d VAL1_PVAL_IFLD (DATA_IFLD + 2)
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@d VAL2_PVAL_IFLD (DATA_IFLD + 3)
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=
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inter_error_message *PropertyValueInstruction::new(inter_bookmark *IBM,
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inter_symbol *prop_s, inter_symbol *owner_s, inter_pair val, inter_ti level,
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inter_error_location *eloc) {
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inter_tree_node *P = Inode::new_with_4_data_fields(IBM, PROPERTYVALUE_IST,
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/* PROP_PVAL_IFLD: */ InterSymbolsTable::id_at_bookmark(IBM, prop_s),
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/* OWNER_PVAL_IFLD: */ InterSymbolsTable::id_at_bookmark(IBM, owner_s),
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/* VAL1_PVAL_IFLD: */ InterValuePairs::to_word1(val),
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/* VAL2_PVAL_IFLD: */ InterValuePairs::to_word2(val),
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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 PropertyValueInstruction::transpose(inter_construct *IC, inter_tree_node *P,
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inter_ti *grid, inter_ti grid_extent, inter_error_message **E) {
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InterValuePairs::set(P, VAL1_PVAL_IFLD,
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InterValuePairs::transpose(InterValuePairs::get(P, VAL1_PVAL_IFLD), grid, grid_extent, E));
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}
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@ Verification begins with sanity checks, but then also adds the new property
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value to the list of properties of the owner.
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=
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void PropertyValueInstruction::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::SID_field(owner, P, PROP_PVAL_IFLD, PROPERTY_IST);
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if (*E) return;
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*E = VerifyingInter::POID_field(owner, P, OWNER_PVAL_IFLD);
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if (*E) return;
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inter_symbol *prop_s = PropertyValueInstruction::property(P);
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*E = VerifyingInter::data_pair_fields(owner, P, VAL1_PVAL_IFLD, InterTypes::unchecked());
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if (*E) return;
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inter_symbol *owner_s = PropertyValueInstruction::owner(P);
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if (PropertyValueInstruction::permitted(P, owner, owner_s, prop_s) == FALSE) {
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text_stream *err = Str::new();
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WRITE_TO(err, "no permission for '%S' have this property",
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InterSymbol::identifier(owner_s));
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*E = Inode::error(P, err, InterSymbol::identifier(prop_s));
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return;
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}
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inter_node_list *FL;
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if (TypenameInstruction::is(owner_s))
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FL = TypenameInstruction::properties_list(owner_s);
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else
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FL = InstanceInstruction::properties_list(owner_s);
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inter_tree_node *X;
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LOOP_THROUGH_INTER_NODE_LIST(X, FL)
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if (PropertyValueInstruction::property(X) == prop_s) {
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*E = Inode::error(P, I"duplicate property value", NULL);
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return;
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}
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InterNodeList::add(FL, P);
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}
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int PropertyValueInstruction::permitted(inter_tree_node *F, inter_package *pack,
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inter_symbol *owner, inter_symbol *prop_s) {
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if (InstanceInstruction::is(owner)) {
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inter_node_list *FL = InstanceInstruction::permissions_list(owner);
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inter_tree_node *X;
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LOOP_THROUGH_INTER_NODE_LIST(X, FL)
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if (PermissionInstruction::property(X) == prop_s)
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return TRUE;
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owner = InstanceInstruction::typename(owner);
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}
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while (owner) {
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inter_node_list *FL = TypenameInstruction::permissions_list(owner);
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if (FL == NULL) internal_error("no permissions list");
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inter_tree_node *X;
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LOOP_THROUGH_INTER_NODE_LIST(X, FL)
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if (PermissionInstruction::property(X) == prop_s)
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return TRUE;
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owner = TypenameInstruction::super(owner);
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}
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return FALSE;
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}
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@h Creating from textual Inter syntax.
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=
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void PropertyValueInstruction::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 *prop_name = ilp->mr.exp[0], *owner_name = ilp->mr.exp[1];
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inter_symbol *prop_s = TextualInter::find_symbol(IBM, eloc, prop_name, PROPERTY_IST, E);
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if (*E) return;
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inter_symbol *owner_s = PropertyValueInstruction::parse_owner(eloc,
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InterBookmark::scope(IBM), owner_name, E);
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if (*E) return;
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inter_type val_type = InterTypes::of_symbol(prop_s);
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inter_pair val = InterValuePairs::undef();
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*E = TextualInter::parse_pair(ilp->line, eloc, IBM, val_type, ilp->mr.exp[2], &val);
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if (*E) return;
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*E = PropertyValueInstruction::new(IBM, prop_s, owner_s, val,
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(inter_ti) ilp->indent_level, eloc);
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}
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inter_symbol *PropertyValueInstruction::parse_owner(inter_error_location *eloc,
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inter_symbols_table *T, text_stream *name, inter_error_message **E) {
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*E = NULL;
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inter_symbol *symb = InterSymbolsTable::symbol_from_name(T, name);
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if (symb == NULL) {
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*E = InterErrors::quoted(I"no such symbol", name, eloc);
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return NULL;
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}
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inter_tree_node *D = InterSymbol::definition(symb);
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if (D == NULL) {
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*E = InterErrors::quoted(I"undefined symbol", name, eloc);
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return NULL;
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}
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if ((Inode::isnt(D, TYPENAME_IST)) &&
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(Inode::isnt(D, INSTANCE_IST))) {
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*E = InterErrors::quoted(I"owner not an instance or enumerated type", name, eloc);
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return NULL;
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}
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return symb;
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}
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@h Writing to textual Inter syntax.
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=
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void PropertyValueInstruction::write(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P) {
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inter_symbol *prop_s = PropertyValueInstruction::property(P);
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inter_symbol *owner_s = PropertyValueInstruction::owner(P);
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WRITE("propertyvalue %S of %S = ",
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InterSymbol::identifier(prop_s), InterSymbol::identifier(owner_s));
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TextualInter::write_pair(OUT, P, PropertyValueInstruction::value(P), FALSE);
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}
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@h Access functions.
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=
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inter_symbol *PropertyValueInstruction::property(inter_tree_node *P) {
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if (P == NULL) return NULL;
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if (Inode::isnt(P, PROPERTYVALUE_IST)) return NULL;
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return InterSymbolsTable::symbol_from_ID_at_node(P, PROP_PVAL_IFLD);
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}
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inter_symbol *PropertyValueInstruction::owner(inter_tree_node *P) {
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if (P == NULL) return NULL;
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if (Inode::isnt(P, PROPERTYVALUE_IST)) return NULL;
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return InterSymbolsTable::symbol_from_ID_at_node(P, OWNER_PVAL_IFLD);
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}
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inter_pair PropertyValueInstruction::value(inter_tree_node *P) {
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if (P == NULL) return InterValuePairs::undef();
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if (Inode::isnt(P, PROPERTYVALUE_IST)) return InterValuePairs::undef();
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return InterValuePairs::get(P, VAL1_PVAL_IFLD);
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}
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