211 lines
6.8 KiB
C++
211 lines
6.8 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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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_bool = nullptr;
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static expr * g_ff = nullptr;
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static expr * g_tt = nullptr;
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static expr * g_char = nullptr;
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static expr * g_ascii = 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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expr from_string_core(unsigned i, std::string const & s);
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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 pair<expr, constraint_seq> get_type(expr const &, extension_context &) const {
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return mk_pair(*g_string, constraint_seq());
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}
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virtual optional<expr> expand(expr const &, extension_context &) const {
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return some_expr(from_string_core(0, 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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out << "\"";
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for (unsigned i = 0; i < m_value.size(); i++) {
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char c = m_value[i];
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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 (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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out << "\"";
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}
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virtual format pp(formatter const &) const {
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std::ostringstream out;
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display(out);
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return format(out.str());
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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_bool = new expr(Const(name("bool")));
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g_ff = new expr(Const(name("bool", "ff")));
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g_tt = new expr(Const(name("bool", "tt")));
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g_char = new expr(Const(name("char")));
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g_ascii = new expr(Const(name("char", "mk")));
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g_string = new expr(Const(name("string")));
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g_empty = new expr(Const(name("string", "empty")));
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g_str = new expr(Const(name("string", "str")));
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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_str;
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delete g_empty;
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delete g_string;
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delete g_ascii;
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delete g_char;
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delete g_tt;
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delete g_ff;
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delete g_bool;
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delete g_string_opcode;
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delete g_string_macro;
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}
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bool has_string_decls(environment const & env) {
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try {
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type_checker tc(env);
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return
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tc.infer(*g_ff).first == *g_bool &&
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tc.infer(*g_tt).first == *g_bool &&
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tc.infer(*g_ascii).first == *g_bool >> (*g_bool >> (*g_bool >> (*g_bool >> (*g_bool >> (*g_bool >> (*g_bool >> (*g_bool >> *g_char))))))) &&
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tc.infer(*g_empty).first == *g_string &&
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tc.infer(*g_str).first == *g_char >> (*g_string >> *g_string);
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} catch (exception &) {
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return false;
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}
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}
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expr from_char(unsigned char c) {
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buffer<expr> bits;
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while (c != 0) {
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if (c % 2 == 1)
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bits.push_back(*g_tt);
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else
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bits.push_back(*g_ff);
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c /= 2;
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}
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while (bits.size() < 8)
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bits.push_back(*g_ff);
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return mk_rev_app(*g_ascii, bits.size(), bits.data());
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}
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expr from_string_core(unsigned i, std::string const & s) {
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if (i == s.size())
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return *g_empty;
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else
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return mk_app(*g_str, from_char(s[i]), from_string_core(i+1, s));
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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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bool to_char_core(expr const & e, buffer<char> & tmp) {
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buffer<expr> args;
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if (get_app_rev_args(e, args) == *g_ascii && args.size() == 8) {
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unsigned v = 0;
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for (unsigned i = 0; i < args.size(); i++) {
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v *= 2;
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if (args[i] == *g_tt)
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v++;
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else if (args[i] != *g_ff)
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return false;
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}
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tmp.push_back(v);
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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, buffer<char> & tmp) {
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if (e == *g_empty) {
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return true;
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} else {
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buffer<expr> args;
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return
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get_app_args(e, args) == *g_str &&
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args.size() == 2 &&
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to_char_core(args[0], tmp) &&
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to_string_core(args[1], tmp);
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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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buffer<char> tmp;
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if (to_string_core(e, tmp)) {
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std::string r;
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unsigned i = tmp.size();
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while (i > 0) {
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--i;
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r += tmp[i];
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}
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return optional<std::string>(r);
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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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