571 lines
27 KiB
C++
571 lines
27 KiB
C++
/*
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Copyright (c) 2014 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#pragma once
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#include <string>
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#include <utility>
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#include <vector>
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#include "runtime/exception.h"
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#include "runtime/flet.h"
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#include "util/name_map.h"
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#include "util/task.h"
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#include "kernel/environment.h"
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#include "kernel/expr_maps.h"
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#include "library/util.h"
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#include "library/module.h"
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#include "library/abstract_parser.h"
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#include "library/io_state.h"
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#include "library/io_state_stream.h"
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#include "library/message_builder.h"
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#include "library/tactic/tactic_state.h"
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#include "frontends/lean/parser_state.h"
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#include "frontends/lean/local_decls.h"
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#include "frontends/lean/local_level_decls.h"
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#include "frontends/lean/parser_config.h"
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#include "frontends/lean/local_context_adapter.h"
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#include "frontends/lean/decl_util.h"
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namespace lean {
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struct interrupt_parser {};
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typedef environment local_environment;
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class metavar_context;
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class local_context_adapter;
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class scope_message_context;
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class parser : public abstract_parser {
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environment m_env;
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name_generator m_ngen;
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io_state m_ios;
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bool m_use_exceptions;
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bool m_show_errors;
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module_loader m_import_fn;
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std::string m_file_name;
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scanner m_scanner;
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token_kind m_curr;
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local_level_decls m_local_level_decls;
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local_expr_decls m_local_decls;
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bool m_has_params; // true context context contains parameters
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name_set m_level_variables;
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name_set m_variables; // subset of m_local_decls that is marked as variables
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name_set m_include_vars; // subset of m_local_decls that is marked as include
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bool m_imports_parsed;
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bool m_scanner_inited = false;
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parser_scope_stack m_parser_scope_stack;
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parser_scope_stack m_quote_stack;
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bool m_in_quote;
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bool m_in_pattern;
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pos_info m_last_cmd_pos;
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unsigned m_next_tag_idx;
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unsigned m_next_inst_idx;
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// By default, when the parser finds a unknown identifier, it signs an error.
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// When the following flag is true, it creates a constant.
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// This flag is when we are trying to parse mutually recursive declarations.
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id_behavior m_id_behavior;
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optional<pos_info> m_break_at_pos;
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// auto completing
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bool m_complete{false};
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// error recovery
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bool m_error_recovery = true;
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bool m_error_since_last_cmd = false;
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pos_info m_last_recovered_error_pos {0, 0};
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optional<pos_info> m_backtracking_pos;
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// curr command token
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name m_cmd_token;
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// profiling
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bool m_profile;
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// If the following flag is true we do not raise error messages
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// noncomputable definitions not tagged as noncomputable.
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bool m_ignore_noncomputable;
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void sync_command();
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unsigned curr_level_lbp() const;
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level parse_max_imax(bool is_max);
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level parse_level_id();
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level parse_level_nud();
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level parse_level_led(level left);
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std::string parse_doc_block();
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void parse_mod_doc_block();
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void process_imports();
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void process_postponed(buffer<expr> const & args, bool is_left, buffer<notation::action_kind> const & kinds,
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buffer<list<expr>> const & nargs, buffer<expr> const & ps, buffer<pair<unsigned, pos_info>> const & scoped_info,
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list<notation::action> const & postponed, pos_info const & p, buffer<expr> & new_args);
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expr parse_notation(parse_table t, expr * left);
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expr parse_nud_notation();
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expr parse_led_notation(expr left);
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expr parse_inaccessible();
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expr parse_placeholder();
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expr parse_anonymous_var_pattern();
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expr parse_nud();
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bool curr_starts_expr();
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expr parse_numeral_expr(bool user_notation = true);
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expr parse_decimal_expr();
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expr parse_string_expr();
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expr parse_char_expr();
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expr parse_inst_implicit_decl();
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void parse_inst_implicit_decl(buffer<expr> & r);
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expr parse_binder_core(binder_info bi, unsigned rbp);
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bool parse_binder_collection(buffer<pair<pos_info, name>> const & names, binder_info bi, buffer<expr> & r);
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void parse_binder_block(buffer<expr> & r, binder_info bi, unsigned rbp, bool allow_default);
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struct parse_binders_config {
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/* (input) If m_allow_empty is true, then parse_binders will succeed even if not binder is parsed. */
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bool m_allow_empty{false};
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/* (input) right binding power */
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unsigned m_rbp{0};
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/* (input) If m_simple_only, then binder modifiers '{', '[' and '⦃' are not allowed. */
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bool m_simple_only{false};
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/* (input) If true, it will allow binders of the form (x : T := v), and they will be converted
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into (x : opt_param T v) */
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bool m_allow_default{false};
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/* (input) If true, then all binders must be surrounded with some kind of bracket. (e.g., '()', '{}', '[]').
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We use this feature when parsing examples/definitions/theorems. The goal is to avoid counter-intuitive
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declarations such as:
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example p : false := trivial
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def main proof : false := trivial
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which would be parsed as
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example (p : false) : _ := trivial
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def main (proof : false) : _ := trivial
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where `_` in both cases is elaborated into `true`. This issue was raised by @gebner in the slack channel.
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Remark: we still want implicit delimiters for lambda/pi expressions. That is, we want to
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write
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fun x : t, s
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or
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fun x, s
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instead of
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fun (x : t), s
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*/
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bool m_explicit_delimiters{false};
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/* (input and output)
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If m_infer_kind != nullptr, then a sequence of binders can be prefixed with '{}' or '()'
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Moreover, *m_infer_kind will be updated with
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- implicit_infer_kind::None if prefix is '()'
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- implicit_infer_kind::RelaxedImplicit if prefix is '{}'
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- implicit_infer_kind::Implicit, otherwise. */
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implicit_infer_kind * m_infer_kind{nullptr};
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/* (output) It is set to true if the last binder is surrounded
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with some kind of bracket (e.g., '()', '{}', '[]'). */
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bool m_last_block_delimited{false};
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/* (output) If m_nentries != nullptr, then local notation declarations are stored here */
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buffer<notation_entry> * m_nentries{nullptr};
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};
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void parse_binders_core(buffer<expr> & r, parse_binders_config & cfg);
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local_environment parse_binders(buffer<expr> & r, parse_binders_config & cfg);
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bool parse_local_notation_decl(buffer<notation_entry> * entries);
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pair<optional<name>, expr> parse_id_tk_expr(name const & tk, unsigned rbp);
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friend environment section_cmd(parser & p);
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friend environment namespace_cmd(parser & p);
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friend environment end_scoped_cmd(parser & p);
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parser_scope mk_parser_scope(optional<options> const & opts = optional<options>());
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void restore_parser_scope(parser_scope const & s);
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bool has_local_scopes() const { return !is_nil(m_parser_scope_stack); }
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void push_local_scope(bool save_options = true);
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void pop_local_scope();
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std::shared_ptr<snapshot> mk_snapshot();
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optional<expr> resolve_local(name const & id, pos_info const & p, names const & extra_locals,
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bool allow_field_notation = true);
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friend class module_parser;
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friend class patexpr_to_expr_fn;
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struct backtracking_exception {};
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flet<optional<pos_info>> backtracking_scope() {
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return flet<optional<pos_info>>(m_backtracking_pos, optional<pos_info>(pos()));
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}
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bool consumed_input() {
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return *m_backtracking_pos != pos();
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}
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public:
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parser(environment const & env, io_state const & ios,
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module_loader const & import_fn,
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std::istream & strm, std::string const & file_name,
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bool use_exceptions = false);
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~parser();
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void init_scanner();
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name next_name() { return m_ngen.next(); }
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void set_break_at_pos(pos_info const & pos) { m_break_at_pos = some(pos); }
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optional<pos_info> const & get_break_at_pos() const { return m_break_at_pos; }
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template <class T>
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T without_break_at_pos(std::function<T()> const & f) {
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flet<optional<pos_info>> l(m_break_at_pos, {});
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return f();
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}
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template <class T>
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pair<T, pos_info> with_input(std::istream & input, std::function<T()> const & f) {
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flet<token_kind> l(m_curr, token_kind::Eof);
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flet<scanner> l1(m_scanner, scanner(input, m_scanner.get_stream_name().c_str()));
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m_curr = m_scanner.scan(m_env);
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T t = f();
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return {t, pos()};
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}
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bool get_complete() { return m_complete; }
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void set_complete(bool complete) { m_complete = complete; }
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/** \brief Throw \c break_at_pos_exception with given context if \c m_break_at_pos is inside current token. */
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void check_break_at_pos(break_at_pos_exception::token_context ctxt = break_at_pos_exception::token_context::none);
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/** \brief Throw \c break_at_pos_exception with empty token and given context if \c m_break_at_pos is before current
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position. */
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void check_break_before(break_at_pos_exception::token_context ctxt = break_at_pos_exception::token_context::none);
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bool ignore_noncomputable() const { return m_ignore_noncomputable; }
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void set_ignore_noncomputable() { m_ignore_noncomputable = true; }
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bool in_pattern() const { return m_in_pattern; }
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name mk_anonymous_inst_name();
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unsigned curr_lbp() const;
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cmd_table const & cmds() const { return get_cmd_table(env()); }
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environment const & env() const { return m_env; }
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void set_env(environment const & env) { m_env = env; }
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io_state const & ios() const { return m_ios; }
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message_builder mk_message(pos_info const & p, message_severity severity) const;
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message_builder mk_message(pos_info const & start_pos, pos_info const & end_pos, message_severity severity) const;
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message_builder mk_message(message_severity severity) const;
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local_level_decls const & get_local_level_decls() const { return m_local_level_decls; }
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local_expr_decls const & get_local_expr_decls() const { return m_local_decls; }
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void updt_options();
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options get_options() const { return m_ios.get_options(); }
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template<typename T> void set_option(name const & n, T const & v) { m_ios.set_option(n, v); }
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/** \brief Return the current position information */
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virtual pos_info pos() const override final { return pos_info(m_scanner.get_line(), m_scanner.get_pos()); }
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expr rec_save_pos(expr const & e, pos_info p);
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expr rec_save_pos(expr const & e, optional<pos_info> p) { return p ? rec_save_pos(e, *p) : e; }
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expr update_pos(expr e, pos_info p);
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void erase_pos(expr const & e);
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pos_info pos_of(expr const & e, pos_info default_pos) const;
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pos_info pos_of(expr const & e) const { return pos_of(e, pos()); }
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pos_info cmd_pos() const { return m_last_cmd_pos; }
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name const & get_cmd_token() const { return m_cmd_token; }
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parser_pos_provider get_parser_pos_provider(pos_info const & some_pos) const {
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return parser_pos_provider(m_file_name, some_pos);
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}
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expr mk_app(expr fn, expr arg, pos_info const & p);
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expr mk_app(expr fn, buffer<expr> const & args, pos_info const & p);
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expr mk_app(std::initializer_list<expr> const & args, pos_info const & p);
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parse_table const & nud() const { return get_nud_table(env()); }
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parse_table const & led() const { return get_led_table(env()); }
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expr copy_with_new_pos(expr const & e, pos_info p);
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/** \brief Read the next token. */
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void scan();
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/** \brief Return the current token */
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token_kind curr() const { return m_curr; }
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/** \brief Return true iff the current token is an identifier */
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bool curr_is_identifier() const { return curr() == token_kind::Identifier; }
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/** \brief Return true iff the current token is a numeral */
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virtual bool curr_is_numeral() const final override { return curr() == token_kind::Numeral; }
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bool curr_is_decimal() const { return curr() == token_kind::Decimal; }
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/** \brief Return true iff the current token is a string */
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bool curr_is_string() const { return curr() == token_kind::String; }
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/** \brief Return true iff the current token is a keyword */
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bool curr_is_keyword() const { return curr() == token_kind::Keyword; }
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/** \brief Return true iff the current token is a keyword */
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bool curr_is_command() const { return curr() == token_kind::CommandKeyword; }
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/** \brief Return true iff the current token is EOF */
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bool curr_is_eof() const { return curr() == token_kind::Eof; }
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/** \brief Return true iff the current token is a keyword */
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bool curr_is_quoted_symbol() const { return curr() == token_kind::QuotedSymbol; }
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/** \brief Return true iff the current token is a keyword named \c tk or an identifier named \c tk */
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bool curr_is_token_or_id(name const & tk) const;
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/** \brief Return true iff the current token is a command, EOF, period or script block */
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bool curr_is_command_like() const;
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/** \brief Read the next token if the current one is not End-of-file. */
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virtual void next() override final { if (m_curr != token_kind::Eof) scan(); }
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/** \brief Return true iff the current token is a keyword (or command keyword) named \c tk */
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virtual bool curr_is_token(name const & tk) const override final;
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/** \brief Check current token, and move to next characther, throw exception if current token is not \c tk. Returns true if succesful. */
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bool check_token_next(name const & tk, char const * msg);
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void check_token_or_id_next(name const & tk, char const * msg);
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/** \brief Check if the current token is an identifier, if it is return it and move to next token,
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otherwise throw an exception. */
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name check_id_next(char const * msg, break_at_pos_exception::token_context ctxt =
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break_at_pos_exception::token_context::none);
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void check_not_internal(name const & n, pos_info const & pos);
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/** \brief Similar to check_id_next, but also ensures the identifier is *not* an internal/reserved name. */
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name check_decl_id_next(char const * msg, break_at_pos_exception::token_context ctxt =
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break_at_pos_exception::token_context::none);
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/** \brief Check if the current token is an atomic identifier, if it is, return it and move to next token,
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otherwise throw an exception. */
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name check_atomic_id_next(char const * msg);
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name check_atomic_decl_id_next(char const * msg);
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names to_constants(name const & id, char const * msg, pos_info const & p) const;
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name to_constant(name const & id, char const * msg, pos_info const & p);
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/** \brief Check if the current token is a constant, if it is, return it and move to next token, otherwise throw an exception. */
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name check_constant_next(char const * msg);
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mpq const & get_num_val() const { return m_scanner.get_num_val(); }
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name const & get_name_val() const { return m_scanner.get_name_val(); }
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std::string const & get_str_val() const { return m_scanner.get_str_val(); }
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token_info const & get_token_info() const { return m_scanner.get_token_info(); }
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std::string const & get_stream_name() const { return m_scanner.get_stream_name(); }
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unsigned get_small_nat();
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virtual unsigned parse_small_nat() override final;
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virtual std::string parse_string_lit() override final;
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double parse_double();
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bool parse_local_notation_decl() { return parse_local_notation_decl(nullptr); }
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level parse_level(unsigned rbp = 0);
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expr parse_binder(unsigned rbp);
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local_environment parse_binders(buffer<expr> & r, bool & last_block_delimited) {
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parse_binders_config cfg;
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auto new_env = parse_binders(r, cfg);
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last_block_delimited = cfg.m_last_block_delimited;
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return new_env;
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}
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local_environment parse_binders(buffer<expr> & r, unsigned rbp, bool allow_default = false) {
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parse_binders_config cfg;
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cfg.m_rbp = rbp;
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cfg.m_allow_default = allow_default;
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return parse_binders(r, cfg);
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}
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void parse_simple_binders(buffer<expr> & r, unsigned rbp) {
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parse_binders_config cfg;
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cfg.m_simple_only = true;
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cfg.m_rbp = rbp;
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parse_binders(r, cfg);
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}
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local_environment parse_optional_binders(buffer<expr> & r, bool allow_default = false, bool explicit_delimiters = false) {
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parse_binders_config cfg;
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cfg.m_allow_empty = true;
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cfg.m_allow_default = allow_default;
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cfg.m_explicit_delimiters = explicit_delimiters;
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return parse_binders(r, cfg);
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}
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local_environment parse_optional_binders(buffer<expr> & r, implicit_infer_kind & kind, bool allow_default = false) {
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parse_binders_config cfg;
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cfg.m_allow_default = allow_default;
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cfg.m_allow_empty = true;
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cfg.m_infer_kind = &kind;
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return parse_binders(r, cfg);
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}
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local_environment parse_binders(buffer<expr> & r, buffer<notation_entry> & nentries) {
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parse_binders_config cfg;
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cfg.m_nentries = &nentries;
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return parse_binders(r, cfg);
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}
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optional<binder_info> parse_optional_binder_info(bool simple_only = false);
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binder_info parse_binder_info(bool simple_only = false);
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void parse_close_binder_info(optional<binder_info> const & bi);
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void parse_close_binder_info(binder_info bi) { return parse_close_binder_info(optional<binder_info>(bi)); }
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/** \brief Convert an identifier into an expression (constant or local constant) based on the current scope */
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expr id_to_expr(name const & id, pos_info const & p, bool resolve_only = false, bool allow_field_notation = true,
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names const & extra_locals = names());
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/** Always parses an expression. Returns a synthetic sorry even if no input is consumed. */
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virtual expr parse_expr(unsigned rbp = 0) override final;
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/** Tries to parse an expression, or else consumes no input. */
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optional<expr> maybe_parse_expr(unsigned rbp = 0);
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/** \brief Parse an (optionally) qualified expression.
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If the input is of the form <id> : <expr>, then return the pair (some(id), expr).
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Otherwise, parse the next expression and return (none, expr). */
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pair<optional<name>, expr> parse_qualified_expr(unsigned rbp = 0);
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/** \brief If the input is of the form <id> := <expr>, then return the pair (some(id), expr).
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Otherwise, parse the next expression and return (none, expr). */
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pair<optional<name>, expr> parse_optional_assignment(unsigned rbp = 0);
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/** \brief Parse a pattern or expression */
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expr parse_pattern_or_expr(unsigned rbp = 0);
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/** \brief Convert an expression parsed using parse_pattern_or_expr into a pattern.
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The new local constants declared by the pattern are stored at new_locals.
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If skip_main_fn == true, then in the top-level application (f ...), the function f
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is not processed. */
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expr patexpr_to_pattern(expr const & pat_or_expr, bool skip_main_fn, buffer<expr> & new_locals);
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/** \brief Convert an expression parsed using parse_pattern_or_expr into a regular term. */
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expr patexpr_to_expr(expr const & pat_or_expr);
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expr parse_pattern(buffer<expr> & new_locals, unsigned rbp = 0) {
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return patexpr_to_pattern(parse_pattern_or_expr(rbp), false, new_locals);
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}
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/* \brief Set pattern mode, and invoke fn. The new locals are stored in new_locals */
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expr parse_pattern(std::function<expr(parser &)> const & fn, buffer<expr> & new_locals);
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expr parse_id(bool allow_field_notation = true);
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expr parse_led(expr left);
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expr parse_led_loop(expr left, unsigned rbp);
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expr parse_scoped_expr(unsigned num_params, expr const * ps, local_environment const & lenv, unsigned rbp = 0);
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expr parse_scoped_expr(buffer<expr> const & ps, local_environment const & lenv, unsigned rbp = 0) {
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return parse_scoped_expr(ps.size(), ps.data(), lenv, rbp);
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}
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expr parse_scoped_expr(unsigned num_params, expr const * ps, unsigned rbp = 0) {
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return parse_scoped_expr(num_params, ps, local_environment(m_env), rbp);
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}
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expr parse_scoped_expr(buffer<expr> const & ps, unsigned rbp = 0) { return parse_scoped_expr(ps.size(), ps.data(), rbp); }
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expr parse_expr_with_env(local_environment const & lenv, unsigned rbp = 0);
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|
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bool parse_command_like();
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void parse_command(cmd_meta const & meta);
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void parse_imports(unsigned & fingerprint, std::vector<module_name> &);
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|
|
|
struct local_scope {
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|
parser & m_p; environment m_env;
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local_scope(parser & p, bool save_options = false);
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|
local_scope(parser & p, environment const & env);
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|
local_scope(parser & p, optional<environment> const & env);
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|
~local_scope();
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};
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|
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struct quote_scope {
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|
parser & m_p;
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|
id_behavior m_id_behavior;
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|
bool m_old_in_quote;
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|
bool m_in_quote;
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|
bool m_saved_in_pattern;
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|
quote_scope(parser & p, bool q, id_behavior i = id_behavior::AssumeLocalIfNotLocal);
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|
~quote_scope();
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|
};
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|
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bool in_quote() const { return m_in_quote; }
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|
|
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void clear_expr_fvars();
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bool has_locals() const { return !m_local_decls.empty() || !m_local_level_decls.empty(); }
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|
void add_local_level(name const & n, level const & l, bool is_variable = false);
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void add_local_expr(name const & n, expr const & p, bool is_variable = false);
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|
environment add_local_ref(environment const & env, name const & n, expr const & ref);
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|
void add_variable(name const & n, expr const & p);
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|
void add_parameter(name const & n, expr const & p);
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|
void add_local(expr const & p) { return add_local_expr(local_pp_name(p), p); }
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|
bool has_params() const { return m_has_params; }
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|
bool is_local_decl_user_name(expr const & l) const { return is_local(l) && m_local_decls.contains(local_pp_name(l)); }
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|
bool is_local_decl(expr const & l);
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|
bool is_local_level_variable(name const & n) const { return m_level_variables.contains(n); }
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|
bool is_local_variable(expr const & e) const { return m_variables.contains(local_name(e)); }
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|
bool is_local_variable_user_name(name const & n) const {
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|
if (expr const * d = m_local_decls.find(n))
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|
return is_local(*d) && m_variables.contains(local_name(*d));
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|
else
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|
return false;
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|
}
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|
/** \brief Update binder information for the section parameter n, return true if success, and false if n is not a section parameter. */
|
|
bool update_local_binder_info(name const & n, binder_info bi);
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|
void include_variable(name const & n) { m_include_vars.insert(n); }
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|
void omit_variable(name const & n) { m_include_vars.erase(n); }
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|
bool is_include_variable(name const & n) const { return m_include_vars.contains(n); }
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|
void get_include_variables(buffer<expr> & vars) const;
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|
/** \brief Position of the local level declaration named \c n in the sequence of local level decls. */
|
|
unsigned get_local_level_index(name const & n) const { return m_local_level_decls.find_idx(n); }
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|
bool is_local_level(name const & n) const { return m_local_level_decls.contains(n); }
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|
/** \brief Position of the local declaration named \c n in the sequence of local decls. */
|
|
unsigned get_local_index(name const & n) const;
|
|
unsigned get_local_index(expr const & e) const { return get_local_index(local_pp_name(e)); }
|
|
/** \brief Return the local parameter named \c n */
|
|
expr const * get_local(name const & n) const { return m_local_decls.find(n); }
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|
/** \brief Return local declarations as a list of local constants. */
|
|
list<expr> locals_to_context() const;
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|
/** \brief Return all local declarations and aliases */
|
|
list<pair<name, expr>> const & get_local_entries() const { return m_local_decls.get_entries(); }
|
|
|
|
void maybe_throw_error(parser_error && err);
|
|
level parser_error_or_level(parser_error && err);
|
|
expr parser_error_or_expr(parser_error && err);
|
|
void throw_invalid_open_binder(pos_info const & pos);
|
|
|
|
bool has_error_recovery() const { return m_error_recovery; }
|
|
flet<bool> error_recovery_scope(bool enable_recovery) {
|
|
return flet<bool>(m_error_recovery, enable_recovery);
|
|
}
|
|
flet<bool> no_error_recovery_scope() { return error_recovery_scope(false); }
|
|
flet<bool> no_error_recovery_scope_if(bool cond) {
|
|
return error_recovery_scope(m_error_recovery && !cond);
|
|
}
|
|
|
|
/* This is the default mode. We also use it when converting a pre-term that can be a pattern_or_expression
|
|
into an expression.
|
|
|
|
\remark By default, when the parser finds a unknown identifier, it signs an error. */
|
|
struct error_if_undef_scope : public flet<id_behavior> { error_if_undef_scope(parser & p); };
|
|
/* We use this mode when parsing patterns (and a pre-term that can be a pattern or expression). */
|
|
struct all_id_local_scope : public flet<id_behavior> { all_id_local_scope(parser & p); };
|
|
/* We use this mode when converting a pre-term that can be a pattern_or_expression into a pattern. */
|
|
struct undef_id_to_local_scope : public flet<id_behavior> { undef_id_to_local_scope(parser &); };
|
|
|
|
private:
|
|
pair<expr, level_param_names> elaborate(name const & decl_name, metavar_context & mctx, local_context_adapter const & adapter,
|
|
expr const & e, bool check_unassigned = true);
|
|
|
|
public:
|
|
local_context_adapter mk_local_context_adapter() { return local_context_adapter(m_local_decls); }
|
|
pair<expr, level_param_names> elaborate(name const & decl_name, metavar_context & mctx, expr const & e, bool check_unassigned = true);
|
|
pair<expr, level_param_names> elaborate(name const & decl_name, metavar_context & mctx, list<expr> const & lctx, expr const & e, bool check_unassigned);
|
|
pair<expr, level_param_names> elaborate(name const & decl_name, list<expr> const & ctx, expr const & e);
|
|
pair<expr, level_param_names> elaborate_type(name const & decl_name, list<expr> const & lctx, expr const & e);
|
|
/* Elaborate \c e as a type using the given metavariable context, and using m_local_decls as the local context */
|
|
pair<expr, level_param_names> elaborate_type(name const & decl_name, metavar_context & mctx, expr const & e);
|
|
|
|
expr mk_sorry(pos_info const & p, bool synthetic = false);
|
|
|
|
/** return true iff profiling is enabled */
|
|
bool profiling() const { return m_profile; }
|
|
|
|
void get_imports(std::vector<module_name> &);
|
|
|
|
class in_notation_ctx {
|
|
scanner::in_notation_ctx m_ctx;
|
|
public:
|
|
in_notation_ctx(parser & p):m_ctx(p.m_scanner) {}
|
|
};
|
|
|
|
bool in_notation() const { return m_scanner.in_notation(); }
|
|
|
|
public:
|
|
/* pos_info_provider API */
|
|
virtual pos_info get_some_pos() const override;
|
|
virtual char const * get_file_name() const override;
|
|
};
|
|
|
|
bool parse_commands(environment & env, io_state & ios, char const * fname);
|
|
|
|
void initialize_parser();
|
|
void finalize_parser();
|
|
}
|