// using [class] id (id ...) (renaming id->id id->id) (hiding id ... id)
environment using_cmd(parser & p) {
environment env = p.env();
while (true) {
name cls = parse_class(p);
bool decls = cls.is_anonymous() || cls == g_decls || cls == g_declarations;
auto pos = p.pos();
name ns = p.check_id_next("invalid 'using' command, identifier expected");
optional<name> real_ns = to_valid_namespace_name(env, ns);
if (!real_ns)
throw parser_error(sstream() << "invalid namespace name '" << ns << "'", pos);
ns = *real_ns;
env = using_namespace(env, p.ios(), ns, cls);
if (decls) {
// Remark: we currently to not allow renaming and hiding of universe levels
buffer<name> exceptions;
bool found_explicit = false;
while (p.curr_is_token(g_lparen)) {
p.next();
if (p.curr_is_token_or_id(g_renaming)) {
p.next();
while (p.curr_is_identifier()) {
name from_id = p.get_name_val();
p.next();
p.check_token_next(g_arrow, "invalid 'using' command renaming, '->' expected");
name to_id = p.check_id_next("invalid 'using' command renaming, identifier expected");
check_identifier(p, env, ns, from_id);
exceptions.push_back(from_id);
env = add_expr_alias(env, to_id, ns+from_id);
}
} else if (p.curr_is_token_or_id(g_hiding)) {
p.next();
while (p.curr_is_identifier()) {
name id = p.get_name_val();
p.next();
check_identifier(p, env, ns, id);
exceptions.push_back(id);
}
} else if (p.curr_is_identifier()) {
found_explicit = true;
while (p.curr_is_identifier()) {
name id = p.get_name_val();
p.next();
check_identifier(p, env, ns, id);
env = add_expr_alias(env, id, ns+id);
}
} else {
throw parser_error("invalid 'using' command option, identifier, 'hiding' or 'renaming' expected", p.pos());
}
if (found_explicit && !exceptions.empty())
throw parser_error("invalid 'using' command option, mixing explicit and implicit 'using' options", p.pos());
p.check_token_next(g_rparen, "invalid 'using' command option, ')' expected");
}
if (!found_explicit)
env = add_aliases(env, ns, name(), exceptions.size(), exceptions.data());
}
if (!p.curr_is_token(g_lbracket) && !p.curr_is_identifier())
break;
}
return env;
}
static transition parse_transition(parser & p, optional<parse_table> const & pt, name const & tk,
buffer<expr> & locals, buffer<token_entry> & new_tokens, notation_entry_group grp,
name const & pp_tk) {
if (p.curr_is_token_or_id(get_binder_tk())) {
p.next();
unsigned rbp = parse_binders_rbp(p);
return transition(tk, mk_binder_action(rbp), pp_tk);
} else if (p.curr_is_token_or_id(get_binders_tk())) {
p.next();
unsigned rbp = parse_binders_rbp(p);
return transition(tk, mk_binders_action(rbp), pp_tk);
} else if (p.curr_is_identifier()) {
unsigned default_prec = get_default_prec(pt, tk);
name n = p.get_name_val();
p.next();
action a = parse_action(p, tk, default_prec, locals, new_tokens, grp);
expr local_type = mk_Prop(); // type used in notation local declarations, it is irrelevant
expr l = mk_local(n, local_type);
p.add_local(l);
locals.push_back(l);
return transition(tk, a, pp_tk);
} else if (p.curr_is_quoted_symbol() || p.curr_is_keyword() ||
p.curr_is_token(get_assign_tk()) || p.curr_is_command() || p.curr_is_eof()) {
return transition(tk, mk_skip_action(), pp_tk);
} else {
throw parser_error("invalid notation declaration, quoted-symbol, identifier, "
"'binder', 'binders' expected", p.pos());
}
}
static name parse_quoted_symbol_or_token(parser & p, buffer<token_entry> & new_tokens, bool & used_default, notation_entry_group grp) {
used_default = false;
if (p.curr_is_quoted_symbol()) {
environment const & env = p.env();
auto pp_tk = p.get_name_val();
auto tks = utf8_trim(pp_tk.to_string());
auto tkcs = tks.c_str();
check_not_forbidden(tkcs);
p.next();
if (p.curr_is_token(get_colon_tk())) {
p.next();
unsigned prec = parse_precedence(p);
new_tokens.push_back(mk_token_entry(tkcs, prec, grp));
} else if (!get_precedence(env, tkcs, grp)) {
new_tokens.push_back(mk_token_entry(tkcs, LEAN_DEFAULT_PRECEDENCE, grp));
used_default = true;
}
return pp_tk;
} else if (p.curr_is_keyword()) {
auto tk = p.get_token_info().token();
check_not_forbidden(tk.to_string().c_str());
p.next();
return tk;
} else {
throw parser_error("invalid notation declaration, symbol expected", p.pos());
}
}
static void parse_notation_local(parser & p, buffer<expr> & locals) {
if (p.curr_is_identifier()) {
name n = p.get_name_val();
p.next();
expr local_type = mk_Prop(); // type used in notation local declarations, it is irrelevant
expr l = mk_local(n, local_type); // remark: the type doesn't matter
p.add_local(l);
locals.push_back(l);
} else {
throw parser_error("invalid notation declaration, identifier expected", p.pos());
}
}
static name parse_class(parser & p) {
if (p.curr_is_token(g_lbracket)) {
p.next();
name n;
if (p.curr_is_identifier())
n = p.get_name_val();
else if (p.curr_is_keyword() || p.curr_is_command())
n = p.get_token_info().value();
else
throw parser_error("invalid 'using' command, identifier or symbol expected", p.pos());
p.next();
p.check_token_next(g_rbracket, "invalid 'using' command, ']' expected");
return n;
} else {
return name();
}
}
