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/*
jmdict, a frontend to the JMdict file. http://mandrill.fuxx0r.net/jmdict.php
Copyright (C) 2004 Florian Bluemel (florian.bluemel@uni-dortmund.de)
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <cstring>
#include <string>
#include <cctype>
#include <stdexcept>
#include <sqlite3.h>
namespace sql {
template<typename T> struct query_traits;
template<> struct query_traits<const char* const> { static std::string chars() { return "qQs"; } };
template<> struct query_traits<char* const> { static std::string chars() { return "qQs"; } };
template<> struct query_traits<const int> { static std::string chars() { return "cdi"; } };
template<> struct query_traits<const unsigned> { static std::string chars() { return "ouxX"; } };
typedef int (*callback)(void*, int, char**, char**);
class query {
class mem_guard {
public:
mem_guard(char* p) : p(p) {}
~mem_guard() { sqlite3_free(p); }
operator const char*() const { return p; }
private:
char* p;
};
public:
explicit query(const std::string& q = "") : q(q), pos(0) {
ff();
}
query& operator=(const std::string& s) {
q = s;
pos = 0;
ff();
return *this;
}
class wrong_format : public std::logic_error {
public:
wrong_format(char type, const std::string& format)
: std::logic_error(std::string("wrong format string in sql query, expected one of the following: ")
+ format + ", got " + type + ".") {}
};
template<typename T> query& operator%(const T& t)
{
if(type >= q.size() || query_traits<const T>::chars().find(q[type]) == std::string::npos)
throw wrong_format(q[type], query_traits<const T>::chars());
mem_guard repl(sqlite3_mprintf(q.substr(pos, type - pos + 1).c_str(), t));
put(repl);
return *this;
}
query& operator%(const std::string& s) {
return *this % s.c_str();
}
const std::string& str() const {
return q;
}
private:
void put(const char* repl) {
q.replace(pos, type - pos + 1, repl);
pos += strlen(repl);
ff();
}
void ff() {
static const std::string CONV("diouxXeEfFgGaAcsCSPnqQ");
pos = q.find('%', pos);
while (pos < q.size() - 1 && q[pos + 1] == '%')
pos = q.find('%', pos + 2);
type = pos;
while (type < q.size() && CONV.find(q[type]) == std::string::npos)
++type;
}
std::string q;
std::string::size_type pos;
std::string::size_type type;
};
struct db {
explicit db(const std::string& name) {
if (sqlite3_open(name.c_str(), &raw) != SQLITE_OK)
throw std::runtime_error("Could not connect to sqlite database '" + name + "'.");
}
~db() {
sqlite3_close(raw);
}
void exec(const std::string& query, callback cb = 0, void* arg = 0) {
sqlite3_exec(raw, query.c_str(), cb, arg, 0);
}
void exec(const query& query, callback cb = 0, void* arg = 0) {
exec(query.str(), cb, arg);
}
private:
sqlite3* raw;
};
} // namespace sql
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