C++ parser::check_id_next方法代码示例

// 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 void parse_filters(parser & p, buffer<std::string> & pos_names, buffer<std::string> & neg_names) {
    name plus("+"); name minus("-");
    while (p.curr_is_token(get_comma_tk())) {
        p.next();
        if (p.curr_is_token(plus)) {
            p.next();
            pos_names.push_back(p.check_id_next("invalid find_decl command, identifier expected").to_string());
        } else if (p.curr_is_token(minus)) {
            p.next();
            neg_names.push_back(p.check_id_next("invalid find_decl command, identifier expected").to_string());
        } else {
            pos_names.push_back(p.check_id_next("invalid find_decl command, '+', '-', or identifier expected").to_string());
        }
    }
}

expr parse_nested_declaration(parser & p, unsigned, expr const *, pos_info const & pos) {
    try {
        optional<name> n;
        decl_attributes attrs;
        if (!g_allow_nested_declarations)
            throw parser_error("invalid 'abstract' expression, it is only allowed inside definitions", pos);
        if (p.curr_is_token(get_as_tk())) {
            p.next();
            n = p.check_id_next("invalid 'abstract' expression, identifier expected");
        }
        attrs.parse(p);
        expr e = p.parse_expr();
        p.check_token_next(get_end_tk(), "invalid 'abstract' expression, 'end' expected");
        return p.save_pos(mk_nested_declaration(n, attrs, e), pos);
    } catch (exception & ex) {
        consume_until_end(p);
        ex.rethrow();
        lean_unreachable();
    }
}

environment set_option_cmd(parser & p) {
    auto id_pos = p.pos();
    name id = p.check_id_next("invalid set option, identifier (i.e., option name) expected");
    auto decl_it = get_option_declarations().find(id);
    if (decl_it == get_option_declarations().end()) {
        // add "lean" prefix
        name lean_id = name("lean") + id;
        decl_it = get_option_declarations().find(lean_id);
        if (decl_it == get_option_declarations().end()) {
            throw parser_error(sstream() << "unknown option '" << id << "', type 'help options.' for list of available options", id_pos);
        } else {
            id = lean_id;
        }
    }
    option_kind k = decl_it->second.kind();
    if (k == BoolOption) {
        if (p.curr_is_token_or_id(g_true))
            p.set_option(id, true);
        else if (p.curr_is_token_or_id(g_false))
            p.set_option(id, false);
        else
            throw parser_error("invalid Boolean option value, 'true' or 'false' expected", p.pos());
        p.next();
    } else if (k == StringOption) {
        if (!p.curr_is_string())
            throw parser_error("invalid option value, given option is not a string", p.pos());
        p.set_option(id, p.get_str_val());
        p.next();
    } else if (k == DoubleOption) {
        p.set_option(id, p.parse_double());
    } else if (k == UnsignedOption || k == IntOption) {
        p.set_option(id, p.parse_small_nat());
    } else {
        throw parser_error("invalid option value, 'true', 'false', string, integer or decimal value expected", p.pos());
    }
    p.updt_options();
    return p.env();
}

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);
//.........这里部分代码省略.........