253 lines
9.2 KiB
C++
253 lines
9.2 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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#include <algorithm>
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#include "util/sstream.h"
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#include "util/sexpr/option_declarations.h"
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#include "kernel/type_checker.h"
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#include "library/io_state_stream.h"
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#include "library/scoped_ext.h"
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#include "library/aliases.h"
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#include "library/locals.h"
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#include "library/coercion.h"
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#include "frontends/lean/util.h"
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#include "frontends/lean/parser.h"
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#include "frontends/lean/calc.h"
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#include "frontends/lean/notation_cmd.h"
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#include "frontends/lean/inductive_cmd.h"
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#include "frontends/lean/decl_cmds.h"
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namespace lean {
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static name g_raw("raw");
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static name g_true("true");
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static name g_false("false");
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static name g_options("options");
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static name g_lparen("(");
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static name g_rparen(")");
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static name g_arrow("->");
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static name g_lbracket("[");
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static name g_rbracket("]");
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static name g_declarations("declarations");
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static name g_decls("decls");
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static name g_hiding("hiding");
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static name g_renaming("renaming");
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static name g_colon(":");
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environment print_cmd(parser & p) {
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if (p.curr() == scanner::token_kind::String) {
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p.regular_stream() << p.get_str_val() << endl;
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p.next();
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} else if (p.curr_is_token_or_id(g_raw)) {
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p.next();
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expr e = p.parse_expr();
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p.regular_stream() << e << endl;
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} else if (p.curr_is_token_or_id(g_options)) {
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p.next();
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p.regular_stream() << p.ios().get_options() << endl;
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} else {
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throw parser_error("invalid print command", p.pos());
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}
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return p.env();
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}
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environment section_cmd(parser & p) {
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p.push_local_scope();
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return push_scope(p.env(), p.ios());
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}
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environment namespace_cmd(parser & p) {
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name n = p.check_id_next("invalid namespace declaration, identifier expected");
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check_atomic(n);
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return push_scope(p.env(), p.ios(), n);
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}
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environment end_scoped_cmd(parser & p) {
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if (in_section(p.env()))
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p.pop_local_scope();
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return pop_scope(p.env());
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}
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environment check_cmd(parser & p) {
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expr e = p.parse_expr();
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level_param_names ls = to_level_param_names(collect_univ_params(e));
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e = p.elaborate(e);
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expr type = type_checker(p.env()).check(e, ls);
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p.regular_stream() << e << " : " << type << endl;
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return p.env();
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}
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environment set_line_cmd(parser & p) {
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if (!p.curr_is_numeral())
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throw parser_error("invalid #setline command, numeral expected", p.pos());
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unsigned r = p.get_small_nat();
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p.set_line(r);
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p.next();
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return p.env();
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}
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environment exit_cmd(parser &) {
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throw interrupt_parser();
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}
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environment set_option_cmd(parser & p) {
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auto id_pos = p.pos();
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name id = p.check_id_next("invalid set option, identifier (i.e., option name) expected");
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auto decl_it = get_option_declarations().find(id);
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if (decl_it == get_option_declarations().end()) {
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// add "lean" prefix
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name lean_id = name("lean") + id;
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decl_it = get_option_declarations().find(lean_id);
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if (decl_it == get_option_declarations().end()) {
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throw parser_error(sstream() << "unknown option '" << id << "', type 'help options.' for list of available options", id_pos);
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} else {
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id = lean_id;
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}
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}
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option_kind k = decl_it->second.kind();
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if (k == BoolOption) {
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if (p.curr_is_token_or_id(g_true))
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p.set_option(id, true);
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else if (p.curr_is_token_or_id(g_false))
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p.set_option(id, false);
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else
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throw parser_error("invalid Boolean option value, 'true' or 'false' expected", p.pos());
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p.next();
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} else if (k == StringOption) {
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if (!p.curr_is_string())
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throw parser_error("invalid option value, given option is not a string", p.pos());
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p.set_option(id, p.get_str_val());
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p.next();
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} else if (k == DoubleOption) {
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p.set_option(id, p.parse_double());
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} else if (k == UnsignedOption || k == IntOption) {
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p.set_option(id, p.parse_small_nat());
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} else {
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throw parser_error("invalid option value, 'true', 'false', string, integer or decimal value expected", p.pos());
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}
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p.updt_options();
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return p.env();
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}
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static name parse_class(parser & p) {
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if (p.curr_is_token(g_lbracket)) {
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p.next();
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name n;
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if (p.curr_is_identifier())
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n = p.get_name_val();
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else if (p.curr_is_keyword() || p.curr_is_command())
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n = p.get_token_info().value();
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else
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throw parser_error("invalid 'using' command, identifier or symbol expected", p.pos());
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p.next();
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p.check_token_next(g_rbracket, "invalid 'using' command, ']' expected");
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return n;
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} else {
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return name();
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}
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}
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static void check_identifier(parser & p, environment const & env, name const & ns, name const & id) {
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name full_id = ns + id;
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if (!env.find(full_id))
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throw parser_error(sstream() << "invalid 'using' command, unknown declaration '" << full_id << "'", p.pos());
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}
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// using [class] id (id ...) (renaming id->id id->id) (hiding id ... id)
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environment using_cmd(parser & p) {
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environment env = p.env();
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name cls = parse_class(p);
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bool decls = cls.is_anonymous() || cls == g_decls || cls == g_declarations;
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name ns = p.check_id_next("invalid 'using' command, identifier expected");
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env = using_namespace(env, p.ios(), ns, cls);
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if (decls) {
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// Remark: we currently to not allow renaming and hiding of universe levels
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buffer<name> exceptions;
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bool found_explicit = false;
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while (p.curr_is_token(g_lparen)) {
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p.next();
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if (p.curr_is_token_or_id(g_renaming)) {
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p.next();
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while (p.curr_is_identifier()) {
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name from_id = p.get_name_val();
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p.next();
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p.check_token_next(g_arrow, "invalid 'using' command renaming, '->' expected");
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name to_id = p.check_id_next("invalid 'using' command renaming, identifier expected");
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check_identifier(p, env, ns, from_id);
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exceptions.push_back(from_id);
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env = add_alias(env, to_id, mk_constant(ns+from_id));
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}
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} else if (p.curr_is_token_or_id(g_hiding)) {
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p.next();
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while (p.curr_is_identifier()) {
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name id = p.get_name_val();
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p.next();
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check_identifier(p, env, ns, id);
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exceptions.push_back(id);
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}
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} else if (p.curr_is_identifier()) {
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found_explicit = true;
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while (p.curr_is_identifier()) {
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name id = p.get_name_val();
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p.next();
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check_identifier(p, env, ns, id);
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env = add_alias(env, id, mk_constant(ns+id));
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}
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} else {
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throw parser_error("invalid 'using' command option, identifier, 'hiding' or 'renaming' expected", p.pos());
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}
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if (found_explicit && !exceptions.empty())
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throw parser_error("invalid 'using' command option, mixing explicit and implicit 'using' options", p.pos());
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p.check_token_next(g_rparen, "invalid 'using' command option, ')' expected");
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}
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if (!found_explicit)
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env = add_aliases(env, ns, name(), exceptions.size(), exceptions.data());
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}
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return env;
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}
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environment coercion_cmd(parser & p) {
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auto pos = p.pos();
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expr f = p.parse_expr();
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if (!is_constant(f))
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throw parser_error("invalid 'coercion' command, constant expected", pos);
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if (p.curr_is_token(g_colon)) {
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p.next();
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pos = p.pos();
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expr C = p.parse_expr();
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if (!is_constant(C))
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throw parser_error("invalid 'coercion' command, constant expected", pos);
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return add_coercion(p.env(), const_name(f), const_name(C), p.ios());
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} else {
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return add_coercion(p.env(), const_name(f), p.ios());
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}
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}
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cmd_table init_cmd_table() {
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cmd_table r;
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add_cmd(r, cmd_info("using", "create aliases for declarations, and use objects defined in other namespaces", using_cmd));
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add_cmd(r, cmd_info("set_option", "set configuration option", set_option_cmd));
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add_cmd(r, cmd_info("exit", "exit", exit_cmd));
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add_cmd(r, cmd_info("print", "print a string", print_cmd));
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add_cmd(r, cmd_info("section", "open a new section", section_cmd));
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add_cmd(r, cmd_info("namespace", "open a new namespace", namespace_cmd));
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add_cmd(r, cmd_info("end", "close the current namespace/section", end_scoped_cmd));
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add_cmd(r, cmd_info("check", "type check given expression, and display its type", check_cmd));
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add_cmd(r, cmd_info("coercion", "add a new coercion", coercion_cmd));
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add_cmd(r, cmd_info("#setline", "modify the current line number, it only affects error/report messages", set_line_cmd));
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register_decl_cmds(r);
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register_inductive_cmd(r);
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register_notation_cmds(r);
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register_calc_cmds(r);
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return r;
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}
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cmd_table get_builtin_cmds() {
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static optional<cmd_table> r;
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if (!r)
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r = init_cmd_table();
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return *r;
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}
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}
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