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inform7/inter/inter-module/Chapter 4/The Append Construct.w
2019-07-12 11:33:52 +01:00

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[Inter::Append::] The Append Construct.
Defining the append construct.
@
@e APPEND_IST
=
void Inter::Append::define(void) {
inter_construct *IC = Inter::Defn::create_construct(
APPEND_IST,
L"append (%i+) \"(%c+)\"",
I"append", I"appends");
METHOD_ADD(IC, CONSTRUCT_READ_MTID, Inter::Append::read);
METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, Inter::Append::verify);
METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, Inter::Append::write);
}
@
@d SYMBOL_APPEND_IFLD 2
@d TEXT_APPEND_IFLD 3
@d EXTENT_APPEND_IFR 4
=
void Inter::Append::read(inter_construct *IC, inter_reading_state *IRS, inter_line_parse *ilp, inter_error_location *eloc, inter_error_message **E) {
*E = Inter::Defn::vet_level(IRS, APPEND_IST, ilp->indent_level, eloc);
if (*E) return;
if (ilp->no_annotations > 0) {
*E = Inter::Errors::plain(I"__annotations are not allowed", eloc);
return;
}
inter_symbol *symbol = Inter::SymbolsTables::symbol_from_name(Inter::Bookmarks::scope(IRS), ilp->mr.exp[0]);
if (symbol == NULL) {
*E = Inter::Errors::plain(I"no such symbol", eloc);
return;
}
inter_t ID = Inter::create_text(IRS->read_into);
*E = Inter::Constant::parse_text(Inter::get_text(IRS->read_into, ID), ilp->mr.exp[1], 0, Str::len(ilp->mr.exp[1]), eloc);
if (*E) return;
*E = Inter::Append::new(IRS, symbol, ID, (inter_t) ilp->indent_level, eloc);
}
inter_error_message *Inter::Append::new(inter_reading_state *IRS, inter_symbol *symbol, inter_t append_text, inter_t level, struct inter_error_location *eloc) {
inter_frame P = Inter::Frame::fill_2(IRS, APPEND_IST, Inter::SymbolsTables::id_from_IRS_and_symbol(IRS, symbol), append_text, eloc, level);
inter_error_message *E = Inter::Defn::verify_construct(IRS->current_package, P); if (E) return E;
Inter::Frame::insert(P, IRS);
return NULL;
}
void Inter::Append::verify(inter_construct *IC, inter_frame P, inter_package *owner, inter_error_message **E) {
inter_t vcount = P.repo_segment->bytecode[P.index + PREFRAME_VERIFICATION_COUNT]++;
if (P.extent != EXTENT_APPEND_IFR) { *E = Inter::Frame::error(&P, I"extent wrong", NULL); return; }
inter_symbol *symbol = Inter::SymbolsTables::symbol_from_id(Inter::Packages::scope(owner), P.data[SYMBOL_APPEND_IFLD]);;
if (symbol == NULL) { *E = Inter::Frame::error(&P, I"no target name", NULL); return; }
if (P.data[TEXT_APPEND_IFLD] == 0) { *E = Inter::Frame::error(&P, I"no translation text", NULL); return; }
if (vcount == 0) {
inter_t ID = P.data[TEXT_APPEND_IFLD];
text_stream *S = Inter::get_text(P.repo_segment->owning_repo, ID);
Inter::Symbols::set_append(symbol, S);
}
}
void Inter::Append::write(inter_construct *IC, OUTPUT_STREAM, inter_frame P, inter_error_message **E) {
inter_symbol *symbol = Inter::SymbolsTables::symbol_from_frame_data(P, SYMBOL_APPEND_IFLD);
inter_t ID = P.data[TEXT_APPEND_IFLD];
text_stream *S = Inter::get_text(P.repo_segment->owning_repo, ID);
WRITE("append %S \"", symbol->symbol_name);
Inter::Constant::write_text(OUT, S);
WRITE("\"");
}