// 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 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();
}
}
static notation_entry parse_notation_core(parser & p, bool overload, notation_entry_group grp, buffer<token_entry> & new_tokens, bool parse_only,
unsigned priority) {
buffer<expr> locals;
buffer<transition> ts;
parser::local_scope scope(p);
bool is_nud = true;
optional<parse_table> pt;
optional<parse_table> reserved_pt;
if (p.curr_is_numeral()) {
lean_assert(p.curr_is_numeral());
mpz num = p.get_num_val().get_numerator();
p.next();
p.check_token_next(get_assign_tk(), "invalid numeral notation, `:=` expected");
auto e_pos = p.pos();
expr e = p.parse_expr();
check_notation_expr(e, e_pos);
return notation_entry(num, e, overload, parse_only);
} else if (p.curr_is_identifier()) {
parse_notation_local(p, locals);
is_nud = false;
pt = get_led_table(p.env());
if (grp != notation_entry_group::Reserve)
reserved_pt = get_reserved_led_table(p.env());
} else {
pt = get_nud_table(p.env());
if (grp != notation_entry_group::Reserve)
reserved_pt = get_reserved_nud_table(p.env());
}
bool used_default = false;
while ((grp != notation_entry_group::Reserve && !p.curr_is_token(get_assign_tk())) ||
(grp == notation_entry_group::Reserve && !p.curr_is_command() && !p.curr_is_eof())) {
name pp_tk = parse_quoted_symbol_or_token(p, new_tokens, used_default, grp).to_string();
name tk = utf8_trim(pp_tk.to_string());
if (auto at = find_next(reserved_pt, tk)) {
// Remark: we are ignoring multiple actions in the reserved notation table
transition const & trans = head(at).first;
action const & a = trans.get_action();
reserved_pt = head(at).second;
if (!p.curr_is_quoted_symbol())
pp_tk = trans.get_pp_token();
switch (a.kind()) {
case notation::action_kind::Skip:
if (!p.curr_is_quoted_symbol() && !p.curr_is_keyword() && !p.curr_is_token(get_assign_tk())) {
if (g_allow_local && !p.curr_is_token_or_id(get_binders_tk())) {
ts.push_back(parse_transition(p, pt, tk, locals, new_tokens, grp, pp_tk));
break;
}
p.check_token_or_id_next(get_binders_tk(),
"invalid notation declaration, quoted-symbol, keyword or `:=` expected "
"(declaration prefix matches reserved notation)");
}
ts.push_back(transition(tk, a, pp_tk));
break;
case notation::action_kind::Binder:
if (g_allow_local && !p.curr_is_token_or_id(get_binder_tk())) {
ts.push_back(parse_transition(p, pt, tk, locals, new_tokens, grp, pp_tk));
break;
}
p.check_token_or_id_next(get_binder_tk(),
"invalid notation declaration, 'binder' expected "
"(declaration prefix matches reserved notation)");
ts.push_back(transition(tk, a, pp_tk));
break;
case notation::action_kind::Binders:
if (g_allow_local && !p.curr_is_token_or_id(get_binders_tk())) {
ts.push_back(parse_transition(p, pt, tk, locals, new_tokens, grp, pp_tk));
break;
}
p.check_token_or_id_next(get_binders_tk(),
"invalid notation declaration, 'binders' expected "
"(declaration prefix matches reserved notation)");
ts.push_back(transition(tk, a, pp_tk));
break;
case notation::action_kind::Expr: case notation::action_kind::Exprs: case notation::action_kind::ScopedExpr:
case notation::action_kind::Ext: {
if (g_allow_local && !p.curr_is_identifier()) {
ts.push_back(parse_transition(p, pt, tk, locals, new_tokens, grp, pp_tk));
break;
}
name n = p.check_id_next("invalid notation declaration, identifier expected "
"(declaration prefix matches reserved notation)");
if (p.curr_is_token(get_colon_tk())) {
if (g_allow_local) {
unsigned default_prec = get_default_prec(pt, tk);
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);
ts.push_back(transition(tk, a, pp_tk));
break;
} else {
throw parser_error("invalid notation declaration, invalid ':' occurrence "
"(declaration prefix matches reserved notation)", p.pos());
}
} else {
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);
ts.push_back(transition(tk, a, pp_tk));
break;
}
}}
} else {
reserved_pt = optional<parse_table>();
ts.push_back(parse_transition(p, pt, tk, locals, new_tokens, grp, pp_tk));
}
pt = find_match(pt, ts.back());
}
// for atomic notation where binding power was not set, we set it to max
if (used_default && ts.size() == 1 && ts.back().get_action().kind() == notation::action_kind::Skip) {
lean_assert(!new_tokens.empty());
new_tokens.back().m_prec = get_max_prec();
}
expr n;
if (grp == notation_entry_group::Reserve) {
// reserve notation commands do not have a denotation
lean_assert(p.curr_is_command() || p.curr_is_eof());
expr dummy = mk_Prop(); // any expression without free variables will do
n = dummy;
} else {
lean_assert(p.curr_is_token(get_assign_tk()));
p.next();
if (ts.empty())
throw parser_error("invalid notation declaration, empty notation is not allowed", p.pos());
n = parse_notation_expr(p, locals);
}
return notation_entry(is_nud, to_list(ts.begin(), ts.end()), n, overload, priority, grp, parse_only);
}