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165 lines
5.9 KiB
OpenEdge ABL
165 lines
5.9 KiB
OpenEdge ABL
[PermissionInstruction::] The Permission Construct.
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Defining the permission 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 PermissionInstruction::define_construct(void) {
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inter_construct *IC = InterInstruction::create_construct(PERMISSION_IST, I"permission");
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InterInstruction::specify_syntax(IC,
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I"permission for IDENTIFIER to have IDENTIFIER OPTIONALIDENTIFIER");
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InterInstruction::data_extent_always(IC, 3);
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InterInstruction::permit(IC, INSIDE_PLAIN_PACKAGE_ICUP);
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METHOD_ADD(IC, CONSTRUCT_READ_MTID, PermissionInstruction::read);
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METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, PermissionInstruction::verify);
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METHOD_ADD(IC, CONSTRUCT_XREF_MTID, PermissionInstruction::xref);
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METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, PermissionInstruction::write);
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}
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@h Instructions.
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In bytecode, the frame of a |permission| instruction is laid out with the
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compulsory words -- see //Inter Nodes// -- followed by:
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@d PROP_PERM_IFLD (DATA_IFLD + 0)
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@d OWNER_PERM_IFLD (DATA_IFLD + 1)
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@d STORAGE_PERM_IFLD (DATA_IFLD + 2)
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=
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inter_error_message *PermissionInstruction::new(inter_bookmark *IBM, inter_symbol *prop_s,
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inter_symbol *owner_s, inter_symbol *storage_s, inter_ti level,
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inter_error_location *eloc) {
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inter_ti SID = 0;
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if (storage_s) SID = InterSymbolsTable::id_at_bookmark(IBM, storage_s);
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inter_tree_node *P = Inode::new_with_3_data_fields(IBM, PERMISSION_IST,
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/* PROP_PERM_IFLD: */ InterSymbolsTable::id_at_bookmark(IBM, prop_s),
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/* OWNER_PERM_IFLD: */ InterSymbolsTable::id_at_bookmark(IBM, owner_s),
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/* STORAGE_PERM_IFLD: */ SID,
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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 is quite thorough here: the fields must pass sanity checks, but
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then we also require the owner to be the name of an instance or an enumerated
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typename, and that its permission list should not already contain a permission
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for the same property we are permitting here.
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But the process is not entirely passive because we also use verification to add
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the new permission to the list for the owner and for the property.
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=
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void PermissionInstruction::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_PERM_IFLD, PROPERTY_IST);
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if (*E) return;
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*E = VerifyingInter::POID_field(owner, P, OWNER_PERM_IFLD);
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if (*E) return;
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if (P->W.instruction[STORAGE_PERM_IFLD]) {
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*E = VerifyingInter::SID_field(owner, P, STORAGE_PERM_IFLD, CONSTANT_IST);
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if (*E) return;
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}
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}
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void PermissionInstruction::xref(inter_construct *IC, inter_tree_node *P,
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inter_error_message **E) {
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inter_symbol *prop_s = InterSymbolsTable::symbol_from_ID_at_node(P, PROP_PERM_IFLD);
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inter_symbol *owner_s = InterSymbolsTable::symbol_from_ID_at_node(P, OWNER_PERM_IFLD);
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inter_node_list *FL = NULL;
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if (TypenameInstruction::is(owner_s)) {
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if (InterTypes::is_enumerated(InterTypes::from_type_name(owner_s)) == FALSE) {
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*E = Inode::error(P, I"property permission for non-enumerated kind", NULL);
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return;
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}
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FL = TypenameInstruction::permissions_list(owner_s);
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} else if (InstanceInstruction::is(owner_s)) {
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FL = InstanceInstruction::permissions_list(owner_s);
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} else {
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*E = Inode::error(P, I"property permission for impossible owner", NULL);
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return;
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}
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if (FL == NULL) {
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*E = Inode::error(P, I"property permission for owner without list", NULL);
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return;
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}
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inter_tree_node *X;
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LOOP_THROUGH_INTER_NODE_LIST(X, FL)
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if (InterSymbolsTable::symbol_from_ID_at_node(X, PROP_PERM_IFLD) == prop_s) {
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*E = Inode::error(P, I"duplicate permission", InterSymbol::identifier(prop_s));
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return;
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}
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InterNodeList::add(FL, P);
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FL = Inode::ID_to_frame_list(P, PropertyInstruction::permissions_list(prop_s));
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if (FL == NULL) {
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*E = Inode::error(P, I"property permission for property without list", 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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@h Creating from textual Inter syntax.
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=
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void PermissionInstruction::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 *owner_name = ilp->mr.exp[0];
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text_stream *prop_name = ilp->mr.exp[1];
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text_stream *storage_name = ilp->mr.exp[2];
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inter_symbol *prop_s =
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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 =
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PropertyValueInstruction::parse_owner(eloc, InterBookmark::scope(IBM), owner_name, E);
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if (*E) return;
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inter_symbol *store = NULL;
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if (Str::len(storage_name) > 0) {
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store = TextualInter::find_symbol(IBM, eloc, storage_name, CONSTANT_IST, E);
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if (*E) return;
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}
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*E = PermissionInstruction::new(IBM, prop_s, owner_s, store,
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(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 PermissionInstruction::write(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P) {
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WRITE("permission for ");
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TextualInter::write_symbol_from(OUT, P, OWNER_PERM_IFLD);
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WRITE(" to have ");
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TextualInter::write_symbol_from(OUT, P, PROP_PERM_IFLD);
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if (PermissionInstruction::storage(P)) {
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WRITE(" ");
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TextualInter::write_symbol_from(OUT, P, STORAGE_PERM_IFLD);
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}
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}
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@h Access functions.
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=
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inter_symbol *PermissionInstruction::property(inter_tree_node *P) {
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if (P == NULL) return NULL;
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if (Inode::isnt(P, PERMISSION_IST)) return NULL;
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return InterSymbolsTable::symbol_from_ID_at_node(P, PROP_PERM_IFLD);
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}
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inter_symbol *PermissionInstruction::owner(inter_tree_node *P) {
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if (P == NULL) return NULL;
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if (Inode::isnt(P, PERMISSION_IST)) return NULL;
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return InterSymbolsTable::symbol_from_ID_at_node(P, OWNER_PERM_IFLD);
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}
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inter_symbol *PermissionInstruction::storage(inter_tree_node *P) {
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if (P == NULL) return NULL;
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if (Inode::isnt(P, PERMISSION_IST)) return NULL;
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if (P->W.instruction[STORAGE_PERM_IFLD] == 0) return NULL;
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return InterSymbolsTable::symbol_from_ID_at_node(P, STORAGE_PERM_IFLD);
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}
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