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 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);
}
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);
}
}
