dfd2a23cd4
The new notation is the same one used in Standard ML. It will also allow us to use ' in the beginning of identifiers like Standard ML.
231 lines
7.5 KiB
C++
231 lines
7.5 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 <string>
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#include <algorithm>
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#include "kernel/type_checker.h"
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#include "library/kernel_serializer.h"
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#include "library/string.h"
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#include "library/constants.h"
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#include "library/num.h"
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#include "library/trace.h"
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namespace lean {
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static name * g_string_macro = nullptr;
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static std::string * g_string_opcode = nullptr;
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static expr * g_nat = nullptr;
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static expr * g_char = nullptr;
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static expr * g_char_of_nat = nullptr;
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static expr * g_string = nullptr;
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static expr * g_empty = nullptr;
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static expr * g_str = nullptr;
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static expr * g_fin_mk = nullptr;
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static expr * g_list_char = nullptr;
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static expr * g_list_cons = nullptr;
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static expr * g_list_nil_char = nullptr;
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expr from_string_core(std::string const & s);
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static void display_char_literal_core(std::ostream & out, char c, bool in_string) {
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if (c == '\n')
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out << "\\n";
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else if (c == '\t')
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out << "\\t";
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else if (c == '\r')
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out << "\\r";
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else if (c == 0)
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out << "\\0";
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else if (in_string && c == '\"')
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out << "\\\"";
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else if (!in_string && c == '\'')
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out << "\\'";
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else
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out << c;
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}
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static void display_char_literal(std::ostream & out, char c) {
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out << "#\"";
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display_char_literal_core(out, c, false);
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out << "\"";
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}
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static void display_string_literal(std::ostream & out, std::string const & s) {
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out << "\"";
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for (unsigned i = 0; i < s.size(); i++) {
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display_char_literal_core(out, s[i], true);
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}
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out << "\"";
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}
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format pp_string_literal(std::string const & s) {
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std::ostringstream out;
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display_string_literal(out, s);
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return format(out.str());
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}
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format pp_char_literal(char c) {
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std::ostringstream out;
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display_char_literal(out, c);
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return format(out.str());
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}
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/** \brief The string macro is a compact way of encoding strings inside Lean expressions. */
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class string_macro : public macro_definition_cell {
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std::string m_value;
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public:
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string_macro(std::string const & v):m_value(v) {}
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virtual bool lt(macro_definition_cell const & d) const {
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return m_value < static_cast<string_macro const &>(d).m_value;
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}
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virtual name get_name() const { return *g_string_macro; }
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virtual expr check_type(expr const &, abstract_type_context &, bool) const {
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return *g_string;
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}
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virtual optional<expr> expand(expr const &, abstract_type_context &) const {
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return some_expr(from_string_core(m_value));
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}
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virtual unsigned trust_level() const { return 0; }
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virtual bool operator==(macro_definition_cell const & other) const {
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string_macro const * other_ptr = dynamic_cast<string_macro const *>(&other);
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return other_ptr && m_value == other_ptr->m_value;
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}
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virtual void display(std::ostream & out) const {
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display_string_literal(out, m_value);
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}
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virtual format pp(formatter const &) const {
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return pp_string_literal(m_value);
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}
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virtual bool is_atomic_pp(bool, bool) const { return true; }
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virtual unsigned hash() const { return std::hash<std::string>()(m_value); }
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virtual void write(serializer & s) const { s << *g_string_opcode << m_value; }
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std::string const & get_value() const { return m_value; }
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};
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expr mk_string_macro(std::string const & v) {
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return mk_macro(macro_definition(new string_macro(v)));
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}
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bool is_string_macro(expr const & e) {
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return is_macro(e) && dynamic_cast<string_macro const *>(macro_def(e).raw()) != nullptr;
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}
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string_macro const & to_string_macro(expr const & e) {
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lean_assert(is_string_macro(e));
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return *static_cast<string_macro const *>(macro_def(e).raw());
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}
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void initialize_string() {
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g_string_macro = new name("string_macro");
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g_string_opcode = new std::string("Str");
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g_nat = new expr(Const(get_nat_name()));
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g_char = new expr(Const(get_char_name()));
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g_char_of_nat = new expr(Const(get_char_of_nat_name()));
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g_string = new expr(Const(get_string_name()));
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g_empty = new expr(Const(get_string_empty_name()));
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g_str = new expr(Const(get_string_str_name()));
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g_fin_mk = new expr(Const(get_fin_mk_name()));
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g_list_char = new expr(mk_app(mk_constant(get_list_name(), {mk_level_one()}), *g_char));
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g_list_cons = new expr(mk_constant(get_list_cons_name(), {mk_level_one()}));
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g_list_nil_char = new expr(mk_app(mk_constant(get_list_nil_name(), {mk_level_one()}), *g_char));
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register_macro_deserializer(*g_string_opcode,
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[](deserializer & d, unsigned num, expr const *) {
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if (num != 0)
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throw corrupted_stream_exception();
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std::string v = d.read_string();
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return mk_string_macro(v);
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});
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}
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void finalize_string() {
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delete g_nat;
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delete g_str;
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delete g_empty;
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delete g_string;
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delete g_char_of_nat;
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delete g_char;
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delete g_string_opcode;
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delete g_string_macro;
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delete g_list_char;
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delete g_list_cons;
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delete g_list_nil_char;
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delete g_fin_mk;
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}
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expr from_string_core(std::string const & s) {
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expr r = *g_empty;
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for (unsigned i = 0; i < s.size(); i++) {
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expr n = to_nat_expr(mpz(static_cast<unsigned char>(s[i])));
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expr c = mk_app(*g_char_of_nat, n);
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r = mk_app(*g_str, c, r);
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}
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return r;
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}
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expr from_string(std::string const & s) {
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return mk_string_macro(s);
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}
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optional<char> to_char(expr const & e) {
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buffer<expr> args;
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expr const & fn = get_app_args(e, args);
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if (fn == *g_fin_mk && args.size() == 3) {
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if (auto n = to_num(args[1])) {
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return optional<char>(n->get_unsigned_int());
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} else {
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return optional<char>();
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}
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} else if (fn == *g_char_of_nat && args.size() == 1) {
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if (auto n = to_num(args[0])) {
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return optional<char>(n->get_unsigned_int());
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} else {
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return optional<char>();
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}
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} else {
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return optional<char>();
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}
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}
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static bool append_char(expr const & e, std::string & r) {
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if (auto c = to_char(e)) {
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r.push_back(*c);
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return true;
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} else {
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return false;
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}
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}
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bool to_string_core(expr const & e, std::string & r) {
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if (e == *g_empty || e == *g_list_nil_char) {
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return true;
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} else if (is_string_macro(e)) {
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r = to_string_macro(e).get_value();
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return true;
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} else {
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buffer<expr> args;
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expr const & fn = get_app_args(e, args);
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if (fn == *g_str && args.size() == 2) {
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return to_string_core(args[1], r) && append_char(args[0], r);
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} else if (fn == *g_list_cons && args.size() == 3 && args[0] == *g_char) {
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return to_string_core(args[2], r) && append_char(args[1], r);
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} else {
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return false;
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}
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}
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}
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optional<std::string> to_string(expr const & e) {
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if (is_string_macro(e)) {
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return optional<std::string>(to_string_macro(e).get_value());
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} else {
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std::string tmp;
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if (to_string_core(e, tmp)) {
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return optional<std::string>(tmp);
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} else {
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return optional<std::string>();
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}
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}
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}
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}
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