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87 lines
3.6 KiB
OpenEdge ABL
87 lines
3.6 KiB
OpenEdge ABL
[Inter::Cast::] The Cast Construct.
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Defining the cast construct.
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@
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@e CAST_IST
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=
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void Inter::Cast::define(void) {
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inter_construct *IC = Inter::Defn::create_construct(
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CAST_IST,
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L"cast (%i+) <- (%i+)",
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I"cast", I"casts");
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IC->min_level = 1;
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IC->max_level = 100000000;
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IC->usage_permissions = INSIDE_CODE_PACKAGE + CAN_HAVE_CHILDREN;
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METHOD_ADD(IC, CONSTRUCT_READ_MTID, Inter::Cast::read);
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METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, Inter::Cast::verify);
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METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, Inter::Cast::write);
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METHOD_ADD(IC, VERIFY_INTER_CHILDREN_MTID, Inter::Cast::verify_children);
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}
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@
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@d BLOCK_CAST_IFLD 2
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@d TO_KIND_CAST_IFLD 3
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@d FROM_KIND_CAST_IFLD 4
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@d EXTENT_CAST_IFR 5
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=
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void Inter::Cast::read(inter_construct *IC, inter_bookmark *IBM, inter_line_parse *ilp, inter_error_location *eloc, inter_error_message **E) {
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if (Inter::Annotations::exist(&(ilp->set))) { *E = Inter::Errors::plain(I"__annotations are not allowed", eloc); return; }
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*E = Inter::Defn::vet_level(IBM, CAST_IST, ilp->indent_level, eloc);
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if (*E) return;
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inter_package *routine = Inter::Defn::get_latest_block_package();
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if (routine == NULL) { *E = Inter::Errors::plain(I"'val' used outside function", eloc); return; }
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inter_symbol *from_kind = Inter::Textual::find_symbol(Inter::Bookmarks::tree(IBM), eloc, Inter::Bookmarks::scope(IBM), ilp->mr.exp[1], KIND_IST, E);
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if (*E) return;
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inter_symbol *to_kind = Inter::Textual::find_symbol(Inter::Bookmarks::tree(IBM), eloc, Inter::Bookmarks::scope(IBM), ilp->mr.exp[0], KIND_IST, E);
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if (*E) return;
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*E = Inter::Cast::new(IBM, from_kind, to_kind, (inter_ti) ilp->indent_level, eloc);
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}
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inter_error_message *Inter::Cast::new(inter_bookmark *IBM, inter_symbol *from_kind, inter_symbol *to_kind, inter_ti level, inter_error_location *eloc) {
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inter_tree_node *P = Inode::fill_3(IBM, CAST_IST, 0, InterSymbolsTables::id_from_IRS_and_symbol(IBM, to_kind), InterSymbolsTables::id_from_IRS_and_symbol(IBM, from_kind), eloc, (inter_ti) level);
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inter_error_message *E = Inter::Defn::verify_construct(Inter::Bookmarks::package(IBM), P); if (E) return E;
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Inter::Bookmarks::insert(IBM, P);
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return NULL;
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}
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void Inter::Cast::verify(inter_construct *IC, inter_tree_node *P, inter_package *owner, inter_error_message **E) {
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if (P->W.extent != EXTENT_CAST_IFR) { *E = Inode::error(P, I"extent wrong", NULL); return; }
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*E = Inter::Verify::symbol(owner, P, P->W.data[TO_KIND_CAST_IFLD], KIND_IST); if (*E) return;
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*E = Inter::Verify::symbol(owner, P, P->W.data[FROM_KIND_CAST_IFLD], KIND_IST); if (*E) return;
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}
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void Inter::Cast::write(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P, inter_error_message **E) {
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inter_symbols_table *locals = Inter::Packages::scope_of(P);
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if (locals == NULL) { *E = Inode::error(P, I"function has no symbols table", NULL); return; }
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inter_symbol *from_kind = InterSymbolsTables::symbol_from_frame_data(P, FROM_KIND_CAST_IFLD);
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inter_symbol *to_kind = InterSymbolsTables::symbol_from_frame_data(P, TO_KIND_CAST_IFLD);
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if ((from_kind) && (to_kind)) {
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WRITE("cast %S <- %S", to_kind->symbol_name, from_kind->symbol_name);
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} else { *E = Inode::error(P, I"cannot write cast", NULL); return; }
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}
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void Inter::Cast::verify_children(inter_construct *IC, inter_tree_node *P, inter_error_message **E) {
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int arity_as_invoked = 0;
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LOOP_THROUGH_INTER_CHILDREN(C, P) {
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arity_as_invoked++;
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if ((C->W.data[0] != INV_IST) && (C->W.data[0] != VAL_IST) && (C->W.data[0] != EVALUATION_IST) && (C->W.data[0] != CAST_IST)) {
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*E = Inode::error(P, I"only inv, cast, concatenate and val can be under a cast", NULL);
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return;
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}
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}
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if (arity_as_invoked != 1) {
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*E = Inode::error(P, I"a cast should have exactly one child", NULL);
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return;
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}
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}
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