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inform7/inter/bytecode-module/Chapter 5/The Evaluation Construct.w
2020-07-01 00:58:55 +01:00

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[Inter::Evaluation::] The Evaluation Construct.
Defining the Evaluation construct.
@
@e EVALUATION_IST
=
void Inter::Evaluation::define(void) {
inter_construct *IC = Inter::Defn::create_construct(
EVALUATION_IST,
L"evaluation",
I"evaluation", I"evaluations");
IC->min_level = 1;
IC->max_level = 100000000;
IC->usage_permissions = INSIDE_CODE_PACKAGE + CAN_HAVE_CHILDREN;
METHOD_ADD(IC, CONSTRUCT_READ_MTID, Inter::Evaluation::read);
METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, Inter::Evaluation::verify);
METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, Inter::Evaluation::write);
METHOD_ADD(IC, VERIFY_INTER_CHILDREN_MTID, Inter::Evaluation::verify_children);
}
@
@d BLOCK_EVAL_IFLD 2
@d EXTENT_EVAL_IFR 3
=
void Inter::Evaluation::read(inter_construct *IC, inter_bookmark *IBM, inter_line_parse *ilp, inter_error_location *eloc, inter_error_message **E) {
if (Inter::Annotations::exist(&(ilp->set))) { *E = Inter::Errors::plain(I"__annotations are not allowed", eloc); return; }
*E = Inter::Defn::vet_level(IBM, EVALUATION_IST, ilp->indent_level, eloc);
if (*E) return;
inter_package *routine = Inter::Defn::get_latest_block_package();
if (routine == NULL) { *E = Inter::Errors::plain(I"'evaluation' used outside function", eloc); return; }
*E = Inter::Evaluation::new(IBM, ilp->indent_level, eloc);
}
inter_error_message *Inter::Evaluation::new(inter_bookmark *IBM, int level, inter_error_location *eloc) {
inter_tree_node *P = Inode::fill_1(IBM, EVALUATION_IST, 0, eloc, (inter_ti) level);
inter_error_message *E = Inter::Defn::verify_construct(Inter::Bookmarks::package(IBM), P); if (E) return E;
Inter::Bookmarks::insert(IBM, P);
return NULL;
}
void Inter::Evaluation::verify(inter_construct *IC, inter_tree_node *P, inter_package *owner, inter_error_message **E) {
if (P->W.extent != EXTENT_EVAL_IFR) { *E = Inode::error(P, I"extent wrong", NULL); return; }
}
void Inter::Evaluation::write(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P, inter_error_message **E) {
WRITE("evaluation");
}
void Inter::Evaluation::verify_children(inter_construct *IC, inter_tree_node *P, inter_error_message **E) {
LOOP_THROUGH_INTER_CHILDREN(C, P) {
if ((C->W.data[0] != INV_IST) && (C->W.data[0] != SPLAT_IST) && (C->W.data[0] != VAL_IST) && (C->W.data[0] != LABEL_IST) && (C->W.data[0] != EVALUATION_IST)) {
*E = Inode::error(C, I"only an inv, a splat, a val, or a label can be below an evaluation", NULL);
return;
}
}
}