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reader reports tokenizer errors through normal return

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This commit is contained in:
Roland Conybeare 2025-07-19 16:47:59 -05:00
commit 8c36bbce28
14 changed files with 174 additions and 30 deletions
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18
xo-reader/examples/exprreplxx/exprreplxx.cpp
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@ -93,27 +93,41 @@ main() {
input = span_type::from_string(input_str);
while (!input.empty()) {
auto [expr, consumed, psz] = rdr.read_expr(input, eof);
auto [expr, consumed, psz, error] = rdr.read_expr(input, eof);
if (expr) {
ppconfig ppc;
ppstate_standalone pps(&cout, 0, &ppc);
pps.prettyn(expr);
} else if (error.is_error()) {
cout << "parsing error (detected in " << error.src_function() << "): " << endl;
error.report(cout);
break;
}
input = input.after_prefix(consumed);
parser_stack_size = psz;
}
/* here: input.empty() or error encountered */
/* discard stashed remainder of input line
* (for nicely-formatted errors)
*/
rdr.reset_to_idle_toplevel();
}
auto [expr, _1, _2] = rdr.read_expr(input, true /*eof*/);
auto [expr, _1, _2, error] = rdr.read_expr(input, true /*eof*/);
if (expr) {
ppconfig ppc;
ppstate_standalone pps(&cout, 0, &ppc);
pps.prettyn<rp<Expression>>(rp<Expression>(expr));
} else if (error.is_error()) {
cout << "parsing error (detected in " << error.src_function() << "): " << endl;
error.report(cout);
}
rx.history_save("repl_history.txt");