523 lines
26 KiB
C++
523 lines
26 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 "util/flet.h"
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#include "util/name_map.h"
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#include "util/exception.h"
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#include "kernel/environment.h"
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#include "kernel/expr_maps.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/definition_cache.h"
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#include "frontends/lean/scanner.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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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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/** \brief Extra data needed to be saved when we execute parser::push_local_scope */
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struct parser_scope {
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optional<options> m_options;
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name_set m_level_variables;
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name_set m_variables;
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name_set m_include_vars;
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unsigned m_num_undef_ids;
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unsigned m_next_inst_idx;
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bool m_has_params;
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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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parser_scope(optional<options> const & o, name_set const & lvs, name_set const & vs, name_set const & ivs,
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unsigned num_undef_ids, unsigned next_inst_idx, bool has_params,
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local_level_decls const & lld, local_expr_decls const & led):
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m_options(o), m_level_variables(lvs), m_variables(vs), m_include_vars(ivs),
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m_num_undef_ids(num_undef_ids), m_next_inst_idx(next_inst_idx), m_has_params(has_params),
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m_local_level_decls(lld), m_local_decls(led) {}
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};
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typedef list<parser_scope> parser_scope_stack;
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/** \brief Snapshot of the state of the Lean parser */
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struct snapshot {
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environment m_env;
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local_level_decls m_lds;
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local_expr_decls m_eds;
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name_set m_lvars; // subset of m_lds that is tagged as level variable
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name_set m_vars; // subset of m_eds that is tagged as variable
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name_set m_include_vars; // subset of m_eds that must be included
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options m_options;
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parser_scope_stack m_parser_scope_stack;
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unsigned m_line;
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snapshot():m_line(0) {}
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snapshot(environment const & env, options const & o):m_env(env), m_options(o), m_line(1) {}
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snapshot(environment const & env, local_level_decls const & lds,
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local_expr_decls const & eds, name_set const & lvars, name_set const & vars,
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name_set const & includes, options const & opts, parser_scope_stack const & pss, unsigned line):
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m_env(env), m_lds(lds), m_eds(eds), m_lvars(lvars), m_vars(vars), m_include_vars(includes),
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m_options(opts), m_parser_scope_stack(pss), m_line(line) {}
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};
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typedef std::vector<snapshot> snapshot_vector;
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enum class keep_theorem_mode { All, DiscardImported, DiscardAll };
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enum class id_behavior {
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ErrorIfUndef, /* Default: just generate an error when an undefined identifier is found */
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AssumeConstantIfUndef, /* Assume an undefined identifier is a constant, we use it for parsing inductive datatypes. */
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AssumeLocalIfUndef, /* Assume an undefined identifier is a local constant, we use it when parsing quoted terms. */
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AllLocal /* Assume that *all* identifiers (without level annotation) are local constants. */ };
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class parser : public abstract_parser {
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environment m_env;
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io_state m_ios;
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bool m_verbose;
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bool m_use_exceptions;
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bool m_show_errors;
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unsigned m_num_threads;
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scanner m_scanner;
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scanner::token_kind m_curr;
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optional<std::string> m_base_dir;
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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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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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bool m_found_errors;
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bool m_used_sorry;
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pos_info_table m_pos_table;
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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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// info support
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snapshot_vector * m_snapshot_vector;
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// cache support
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definition_cache * m_cache;
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keep_theorem_mode m_keep_theorem_mode;
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// curr command token
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name m_cmd_token;
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buffer<expr> m_undef_ids;
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// profiling
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bool m_profile;
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// stop/info at line/col
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bool m_stop_at; // if true, then parser stops execution after the given line and column is reached
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unsigned m_stop_at_line;
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bool m_info_at;
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unsigned m_info_at_line;
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unsigned m_info_at_col;
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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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// Temporary field for switching to new elaborator
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bool m_new_elaborator{false};
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void display_warning_pos(unsigned line, unsigned pos);
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void display_error_pos(unsigned line, unsigned pos);
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void display_error_pos(pos_info p);
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void display_error(char const * msg, unsigned line, unsigned pos);
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void display_error(char const * msg, pos_info p);
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void throw_parser_exception(char const * msg, pos_info p);
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void throw_nested_exception(throwable const & ex, pos_info p);
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void sync_command();
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void protected_call(std::function<void()> && f, std::function<void()> && sync);
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tag get_tag(expr e);
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expr copy_with_new_pos(expr const & e, pos_info 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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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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void parse_imports();
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void parse_command();
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bool parse_commands();
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unsigned curr_lbp_core() const;
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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 const & bi, unsigned rbp);
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bool parse_binder_collection(buffer<pair<pos_info, name>> const & names, binder_info const & bi, buffer<expr> & r);
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void parse_binder_block(buffer<expr> & r, binder_info const & bi, unsigned rbp);
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void parse_binders_core(buffer<expr> & r, buffer<notation_entry> * nentries, bool & last_block_delimited, unsigned rbp, bool simple_only);
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local_environment parse_binders(buffer<expr> & r, buffer<notation_entry> * nentries, bool & last_block_delimited,
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bool allow_empty, unsigned rbp, bool simple_only);
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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 context_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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void push_local_scope(bool save_options = true);
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void pop_local_scope();
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void save_snapshot();
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void init_stop_at(options const & opts);
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void replace_theorem(certified_declaration const & thm);
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environment reveal_theorems_core(buffer<name> const & ds, bool all);
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public:
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parser(environment const & env, io_state const & ios,
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std::istream & strm, char const * str_name, optional<std::string> const & base_dir,
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bool use_exceptions = false, unsigned num_threads = 1,
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snapshot const * s = nullptr, snapshot_vector * sv = nullptr,
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keep_theorem_mode tmode = keep_theorem_mode::All);
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~parser();
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void display_error(throwable const & ex);
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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 found_errors() const { return m_found_errors; }
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name mk_anonymous_inst_name();
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bool is_anonymous_inst_name(name const & n) const;
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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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void set_cache(definition_cache * c) { m_cache = c; }
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void cache_definition(name const & n, expr const & pre_type, expr const & pre_value,
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level_param_names const & ls, expr const & type, expr const & value, bool is_trusted);
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/** \brief Try to find an elaborated definition for (n, pre_type, pre_value) in the cache */
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optional<std::tuple<level_param_names, expr, expr>>
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find_cached_definition(name const & n, expr const & pre_type, expr const & pre_value, bool is_trusted);
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void erase_cached_definition(name const & n) { if (m_cache) m_cache->erase(n); }
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bool are_info_lines_valid(unsigned start_line, unsigned end_line) const;
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environment const & env() const { return m_env; }
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io_state const & ios() const { return m_ios; }
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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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bool keep_new_thms() const { return m_keep_theorem_mode != keep_theorem_mode::DiscardAll; }
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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 save_pos(expr e, pos_info p);
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expr rec_save_pos(expr const & e, pos_info p);
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expr update_pos(expr e, pos_info p);
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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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void set_line(unsigned p) { return m_scanner.set_line(p); }
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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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unsigned num_threads() const { return m_num_threads; }
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void add_delayed_theorem(environment const & env, name const & n, level_param_names const & ls,
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expr const & t, expr const & v);
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void add_delayed_theorem(certified_declaration const & cd);
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environment reveal_theorems(buffer<name> const & ds);
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environment reveal_all_theorems();
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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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scanner::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() == scanner::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() == scanner::token_kind::Numeral; }
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bool curr_is_decimal() const { return curr() == scanner::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() == scanner::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() == scanner::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() == scanner::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() == scanner::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() == scanner::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 != scanner::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. */
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void 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);
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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);
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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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list<name> 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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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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unsigned rbp = 0; bool allow_empty = false; bool simple_only = false;
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return parse_binders(r, nullptr, last_block_delimited, allow_empty, rbp, simple_only);
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}
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local_environment parse_binders(buffer<expr> & r, unsigned rbp) {
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bool tmp; bool allow_empty = false; bool simple_only = false;
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return parse_binders(r, nullptr, tmp, allow_empty, rbp, simple_only);
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}
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void parse_simple_binders(buffer<expr> & r, unsigned rbp) {
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bool tmp; bool allow_empty = false; bool simple_only = true;
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parse_binders(r, nullptr, tmp, allow_empty, rbp, simple_only);
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}
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local_environment parse_optional_binders(buffer<expr> & r) {
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bool tmp; bool allow_empty = true; unsigned rbp = 0; bool simple_only = false;
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return parse_binders(r, nullptr, tmp, allow_empty, rbp, simple_only);
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}
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local_environment parse_binders(buffer<expr> & r, buffer<notation_entry> & nentries) {
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bool tmp; bool allow_empty = false; unsigned rbp = 0; bool simple_only = false;
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return parse_binders(r, &nentries, tmp, allow_empty, rbp, simple_only);
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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 const & 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);
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expr 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();
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expr parse_led(expr left);
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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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expr parse_tactic(unsigned rbp = 0);
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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_in_quote;
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bool m_saved_in_pattern;
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quote_scope(parser & p, bool q);
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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_locals();
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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(expr const & l) const { return is_local(l) && m_local_decls.contains(local_pp_name(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(name const & n) const { return m_variables.contains(n); }
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|
bool is_local_variable(expr const & e) const { return is_local_variable(local_pp_name(e)); }
|
|
/** \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 const & bi);
|
|
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); }
|
|
bool is_include_variable(name const & n) const { return m_include_vars.contains(n); }
|
|
void get_include_variables(buffer<expr> & vars) const;
|
|
/** \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); }
|
|
bool is_local_level(name const & n) const { return m_local_level_decls.contains(n); }
|
|
/** \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); }
|
|
/** \brief Return local declarations as a list of local constants. */
|
|
list<expr> locals_to_context() const;
|
|
/** \brief Return all local declarations and aliases */
|
|
list<pair<name, expr>> const & get_local_entries() const { return m_local_decls.get_entries(); }
|
|
/** \brief By default, when the parser finds a unknown identifier, it signs an error.
|
|
These scope objects temporarily change this behavior. In any scope where this object
|
|
is declared, the parse creates a constant/local even when the identifier is unknown.
|
|
This behavior is useful when we are trying to parse mutually recursive declarations and
|
|
tactics.
|
|
*/
|
|
struct undef_id_to_const_scope : public flet<id_behavior> { undef_id_to_const_scope(parser & p); };
|
|
struct undef_id_to_local_scope : public flet<id_behavior> { undef_id_to_local_scope(parser &); };
|
|
struct error_if_undef_scope : public flet<id_behavior> { error_if_undef_scope(parser & p); };
|
|
struct all_id_local_scope : public flet<id_behavior> { all_id_local_scope(parser & p); };
|
|
|
|
/** \brief Return the size of the stack of undefined local constants */
|
|
unsigned get_num_undef_ids() const { return m_undef_ids.size(); }
|
|
/** \brief Return the i-th undefined local constants */
|
|
expr const & get_undef_id(unsigned i) const { return m_undef_ids[i]; }
|
|
|
|
private:
|
|
pair<expr, level_param_names> elaborate(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(expr const & e);
|
|
pair<expr, level_param_names> elaborate(metavar_context & mctx, expr const & e, bool check_unassigned = true);
|
|
pair<expr, level_param_names> elaborate(metavar_context & mctx, list<expr> const & lctx, expr const & e, bool check_unassigned);
|
|
pair<expr, level_param_names> elaborate(list<expr> const & ctx, expr const & e);
|
|
pair<expr, level_param_names> elaborate_type(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(metavar_context & mctx, expr const & e);
|
|
|
|
expr mk_sorry(pos_info const & p);
|
|
bool used_sorry() const { return m_used_sorry; }
|
|
|
|
void display_information_pos(pos_info p);
|
|
void display_warning_pos(pos_info p);
|
|
|
|
/** return true iff profiling is enabled */
|
|
bool profiling() const { return m_profile; }
|
|
|
|
/** parse all commands in the input stream */
|
|
bool operator()() { return parse_commands(); }
|
|
|
|
class in_notation_ctx {
|
|
scanner::in_notation_ctx m_ctx;
|
|
public:
|
|
in_notation_ctx(parser & p):m_ctx(p.m_scanner) {}
|
|
};
|
|
|
|
public:
|
|
/* pos_info_provider API */
|
|
virtual optional<pos_info> get_pos_info(expr const & e) const override;
|
|
virtual pos_info get_some_pos() const override;
|
|
virtual char const * get_file_name() const override;
|
|
};
|
|
|
|
bool parse_commands(environment & env, io_state & ios, std::istream & in,
|
|
char const * strm_name, optional<std::string> const & base_dir,
|
|
bool use_exceptions, unsigned num_threads, definition_cache * cache = nullptr,
|
|
keep_theorem_mode tmode = keep_theorem_mode::All);
|
|
bool parse_commands(environment & env, io_state & ios, char const * fname, optional<std::string> const & base,
|
|
bool use_exceptions, unsigned num_threads,
|
|
definition_cache * cache = nullptr,
|
|
keep_theorem_mode tmode = keep_theorem_mode::All);
|
|
|
|
void initialize_parser();
|
|
void finalize_parser();
|
|
}
|