void parse_table::for_each(buffer<transition> & ts,
std::function<void(unsigned, transition const *,
list<accepting> const &)> const & fn) const {
if (!is_nil(m_ptr->m_accept))
fn(ts.size(), ts.data(), m_ptr->m_accept);
m_ptr->m_children.for_each([&](name const & k, list<pair<action, parse_table>> const & lst) {
for (auto const & p : lst) {
ts.push_back(transition(k, p.first));
p.second.for_each(ts, fn);
ts.pop_back();
}
});
}
static action parse_action(parser & p, name const & prev_token, unsigned default_prec,
buffer<expr> & locals, buffer<token_entry> & new_tokens, notation_entry_group grp) {
if (p.curr_is_token(get_colon_tk())) {
p.next();
if (p.curr_is_numeral() || p.curr_is_token_or_id(get_max_tk())) {
unsigned prec = parse_precedence(p);
return mk_expr_action(prec);
} else if (p.curr_is_token_or_id(get_prev_tk())) {
p.next();
return mk_expr_action(get_precedence(p.env(), new_tokens, prev_token));
} else if (p.curr_is_token_or_id(get_scoped_tk())) {
p.next();
return mk_scoped_expr_action(mk_var(0));
} else {
p.check_token_next(get_lparen_tk(), "invalid notation declaration, '(', numeral or 'scoped' expected");
if (p.curr_is_token_or_id(get_foldl_tk()) || p.curr_is_token_or_id(get_foldr_tk())) {
bool is_fold_right = p.curr_is_token_or_id(get_foldr_tk());
p.next();
auto prec = parse_optional_precedence(p);
name sep = parse_quoted_symbol_or_token(p, new_tokens, grp);
expr rec;
{
parser::local_scope scope(p);
p.check_token_next(get_lparen_tk(), "invalid fold notation argument, '(' expected");
parse_notation_local(p, locals);
parse_notation_local(p, locals);
p.check_token_next(get_comma_tk(), "invalid fold notation argument, ',' expected");
rec = parse_notation_expr(p, locals);
p.check_token_next(get_rparen_tk(), "invalid fold notation argument, ')' expected");
locals.pop_back();
locals.pop_back();
}
optional<expr> ini;
if (!p.curr_is_token(get_rparen_tk()) && !p.curr_is_quoted_symbol())
ini = parse_notation_expr(p, locals);
optional<name> terminator;
if (!p.curr_is_token(get_rparen_tk()))
terminator = parse_quoted_symbol_or_token(p, new_tokens, grp);
p.check_token_next(get_rparen_tk(), "invalid fold notation argument, ')' expected");
return mk_exprs_action(sep, rec, ini, terminator, is_fold_right, prec ? *prec : 0);
} else if (p.curr_is_token_or_id(get_scoped_tk())) {
p.next();
auto prec = parse_optional_precedence(p);
expr rec;
{
parser::local_scope scope(p);
parse_notation_local(p, locals);
p.check_token_next(get_comma_tk(), "invalid scoped notation argument, ',' expected");
rec = parse_notation_expr(p, locals);
locals.pop_back();
}
p.check_token_next(get_rparen_tk(), "invalid scoped notation argument, ')' expected");
return mk_scoped_expr_action(rec, prec ? *prec : 0);
} else {
throw parser_error("invalid notation declaration, 'foldl', 'foldr' or 'scoped' expected", p.pos());
}
}
} else {
return mk_expr_action(default_prec);
}
}