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inform7/inter/inter-module/Chapter 4/The Nop Construct.w
2019-02-05 00:44:07 +00:00

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[Inter::Nop::] The Nop Construct.
Defining the nop construct.
@
@e NOP_IST
=
void Inter::Nop::define(void) {
inter_construct *IC = Inter::Defn::create_construct(
NOP_IST,
NULL,
&Inter::Comment::read,
NULL,
&Inter::Comment::verify,
&Inter::Comment::write,
NULL,
NULL,
NULL,
NULL,
I"nop", I"nops");
IC->usage_permissions = OUTSIDE_OF_PACKAGES + INSIDE_PLAIN_PACKAGE + INSIDE_CODE_PACKAGE;
}
inter_error_message *Inter::Nop::read(inter_reading_state *IRS, inter_line_parse *ilp, inter_error_location *eloc) {
return Inter::Errors::plain(I"nop constructs cannot be expressed in text", eloc);
}
inter_error_message *Inter::Nop::new(inter_reading_state *IRS, inter_t level, inter_error_location *eloc) {
inter_frame P = Inter::Frame::fill_0(IRS, NOP_IST, eloc, level);
inter_error_message *E = Inter::Defn::verify_construct(P);
if (E) return E;
Inter::Frame::insert(P, IRS);
return NULL;
}
inter_error_message *Inter::Nop::nop_out(inter_repository *I, inter_frame P) {
P.data[ID_IFLD] = NOP_IST;
return NULL;
}
inter_error_message *Inter::Nop::verify(inter_frame P) {
return NULL;
}
inter_error_message *Inter::Nop::write(OUTPUT_STREAM, inter_frame P) {
return NULL;
}