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/*
Darts -- Double-ARray Trie System
$Id: darts.h.in 1674 2008-03-22 11:21:34Z taku $;
Copyright(C) 2001-2007 Taku Kudo <taku@chasen.org>
*/
#ifndef DARTS_H_
#define DARTS_H_
#define DARTS_VERSION "0.32"
#include <vector>
#include <cstring>
#include <cstdio>
#ifdef HAVE_ZLIB_H
namespace zlib {
#include <zlib.h>
}
#define SH(p)((unsigned short)(unsigned char)((p)[0]) | ((unsigned short)(unsigned char)((p)[1]) << 8))
#define LG(p)((unsigned long)(SH(p)) |((unsigned long)(SH((p)+2)) << 16))
#endif
namespace Darts {
template <class T> inline T _max(T x, T y) { return(x > y) ? x : y; }
template <class T> inline T* _resize(T* ptr, size_t n, size_t l, T v) {
T *tmp = new T[l];
for (size_t i = 0; i < n; ++i) tmp[i] = ptr[i];
for (size_t i = n; i < l; ++i) tmp[i] = v;
delete [] ptr;
return tmp;
}
template <class T>
class Length {
public: size_t operator()(const T *key) const
{ size_t i; for (i = 0; key[i] != static_cast<T>(0); ++i) {} return i; }
};
template <> class Length<char> {
public: size_t operator()(const char *key) const
{ return std::strlen(key); }
};
template <class node_type_, class node_u_type_,
class array_type_, class array_u_type_,
class length_func_ = Length<node_type_> >
class DoubleArrayImpl {
public:
typedef array_type_ value_type;
typedef node_type_ key_type;
typedef array_type_ result_type; // for compatibility
struct result_pair_type {
value_type value;
size_t length;
};
explicit DoubleArrayImpl(): array_(0), used_(0),
size_(0), alloc_size_(0),
no_delete_(0), error_(0) {}
virtual ~DoubleArrayImpl() { clear(); }
void set_result(value_type *x, value_type r, size_t) const {
*x = r;
}
void set_result(result_pair_type *x, value_type r, size_t l) const {
x->value = r;
x->length = l;
}
void set_array(void *ptr, size_t size = 0) {
clear();
array_ = reinterpret_cast<unit_t *>(ptr);
no_delete_ = true;
size_ = size;
}
const void *array() const {
return const_cast<const void *>(reinterpret_cast<void *>(array_));
}
void clear() {
if (!no_delete_)
delete [] array_;
delete [] used_;
array_ = 0;
used_ = 0;
alloc_size_ = 0;
size_ = 0;
no_delete_ = false;
}
size_t unit_size() const { return sizeof(unit_t); }
size_t size() const { return size_; }
size_t total_size() const { return size_ * sizeof(unit_t); }
size_t nonzero_size() const {
size_t result = 0;
for (size_t i = 0; i < size_; ++i)
if (array_[i].check) ++result;
return result;
}
int build(size_t key_size,
const key_type **key,
const size_t *length = 0,
const value_type *value = 0,
int (*progress_func)(size_t, size_t) = 0) {
if (!key_size || !key) return 0;
progress_func_ = progress_func;
key_ = key;
length_ = length;
key_size_ = key_size;
value_ = value;
progress_ = 0;
resize(8192);
array_[0].base = 1;
next_check_pos_ = 0;
node_t root_node;
root_node.left = 0;
root_node.right = key_size;
root_node.depth = 0;
std::vector<node_t> siblings;
fetch(root_node, siblings);
insert(siblings);
size_ += (1 << 8 * sizeof(key_type)) + 1;
if (size_ >= alloc_size_) resize(size_);
delete [] used_;
used_ = 0;
return error_;
}
int open(const char *file,
const char *mode = "rb",
size_t offset = 0,
size_t size = 0) {
std::FILE *fp = std::fopen(file, mode);
if (!fp) return -1;
if (std::fseek(fp, offset, SEEK_SET) != 0) return -1;
if (!size) {
if (std::fseek(fp, 0L, SEEK_END) != 0) return -1;
size = std::ftell(fp);
if (std::fseek(fp, offset, SEEK_SET) != 0) return -1;
}
clear();
size_ = size;
size_ /= sizeof(unit_t);
array_ = new unit_t[size_];
if (size_ != std::fread(reinterpret_cast<unit_t *>(array_),
sizeof(unit_t), size_, fp)) return -1;
std::fclose(fp);
return 0;
}
int save(const char *file,
const char *mode = "wb",
size_t offset = 0) {
if (!size_) return -1;
std::FILE *fp = std::fopen(file, mode);
if (!fp) return -1;
if (size_ != std::fwrite(reinterpret_cast<unit_t *>(array_),
sizeof(unit_t), size_, fp))
return -1;
std::fclose(fp);
return 0;
}
#ifdef HAVE_ZLIB_H
int gzopen(const char *file,
const char *mode = "rb",
size_t offset = 0,
size_t size = 0) {
std::FILE *fp = std::fopen(file, mode);
if (!fp) return -1;
clear();
size_ = size;
if (!size_) {
if (-1L != static_cast<long>(std::fseek(fp, -8, SEEK_END))) {
char buf[8];
if (std::fread(static_cast<char*>(buf),
1, 8, fp) != sizeof(buf)) {
std::fclose(fp);
return -1;
}
size_ = LG(buf+4);
size_ /= sizeof(unit_t);
}
}
std::fclose(fp);
if (!size_) return -1;
zlib::gzFile gzfp = zlib::gzopen(file, mode);
if (!gzfp) return -1;
array_ = new unit_t[size_];
if (zlib::gzseek(gzfp, offset, SEEK_SET) != 0) return -1;
zlib::gzread(gzfp, reinterpret_cast<unit_t *>(array_),
sizeof(unit_t) * size_);
zlib::gzclose(gzfp);
return 0;
}
int gzsave(const char *file, const char *mode = "wb",
size_t offset = 0) {
zlib::gzFile gzfp = zlib::gzopen(file, mode);
if (!gzfp) return -1;
zlib::gzwrite(gzfp, reinterpret_cast<unit_t *>(array_),
sizeof(unit_t) * size_);
zlib::gzclose(gzfp);
return 0;
}
#endif
template <class T>
inline void exactMatchSearch(const key_type *key,
T & result,
size_t len = 0,
size_t node_pos = 0) const {
result = exactMatchSearch<T> (key, len, node_pos);
return;
}
template <class T>
inline T exactMatchSearch(const key_type *key,
size_t len = 0,
size_t node_pos = 0) const {
if (!len) len = length_func_()(key);
T result;
set_result(&result, -1, 0);
register array_type_ b = array_[node_pos].base;
register array_u_type_ p;
for (register size_t i = 0; i < len; ++i) {
p = b +(node_u_type_)(key[i]) + 1;
if (static_cast<array_u_type_>(b) == array_[p].check)
b = array_[p].base;
else
return result;
}
p = b;
array_type_ n = array_[p].base;
if (static_cast<array_u_type_>(b) == array_[p].check && n < 0)
set_result(&result, -n-1, len);
return result;
}
template <class T>
size_t commonPrefixSearch(const key_type *key,
T* result,
size_t result_len,
size_t len = 0,
size_t node_pos = 0) const {
if (!len) len = length_func_()(key);
register array_type_ b = array_[node_pos].base;
register size_t num = 0;
register array_type_ n;
register array_u_type_ p;
for (register size_t i = 0; i < len; ++i) {
p = b; // + 0;
n = array_[p].base;
if ((array_u_type_) b == array_[p].check && n < 0) {
// result[num] = -n-1;
if (num < result_len) set_result(&result[num], -n-1, i);
++num;
}
p = b +(node_u_type_)(key[i]) + 1;
if ((array_u_type_) b == array_[p].check)
b = array_[p].base;
else
return num;
}
p = b;
n = array_[p].base;
if ((array_u_type_)b == array_[p].check && n < 0) {
if (num < result_len) set_result(&result[num], -n-1, len);
++num;
}
return num;
}
value_type traverse(const key_type *key,
size_t &node_pos,
size_t &key_pos,
size_t len = 0) const {
if (!len) len = length_func_()(key);
register array_type_ b = array_[node_pos].base;
register array_u_type_ p;
for (; key_pos < len; ++key_pos) {
p = b + (node_u_type_)(key[key_pos]) + 1;
if (static_cast<array_u_type_>(b) == array_[p].check) {
node_pos = p;
b = array_[p].base;
} else {
return -2; // no node
}
}
p = b;
array_type_ n = array_[p].base;
if (static_cast<array_u_type_>(b) == array_[p].check && n < 0)
return -n-1;
return -1; // found, but no value
}
private:
struct node_t {
array_u_type_ code;
size_t depth;
size_t left;
size_t right;
};
struct unit_t {
array_type_ base;
array_u_type_ check;
};
unit_t *array_;
unsigned char *used_;
size_t size_;
size_t alloc_size_;
size_t key_size_;
const node_type_ **key_;
const size_t *length_;
const array_type_ *value_;
size_t progress_;
size_t next_check_pos_;
bool no_delete_;
int error_;
int (*progress_func_)(size_t, size_t);
size_t resize(const size_t new_size) {
unit_t tmp;
tmp.base = 0;
tmp.check = 0;
array_ = _resize(array_, alloc_size_, new_size, tmp);
used_ = _resize(used_, alloc_size_, new_size,
static_cast<unsigned char>(0));
alloc_size_ = new_size;
return new_size;
}
size_t fetch(const node_t &parent, std::vector <node_t> &siblings) {
if (error_ < 0) return 0;
array_u_type_ prev = 0;
for (size_t i = parent.left; i < parent.right; ++i) {
if ((length_ ? length_[i] : length_func_()(key_[i])) < parent.depth)
continue;
const node_u_type_ *tmp = reinterpret_cast<const node_u_type_ *>(key_[i]);
array_u_type_ cur = 0;
if ((length_ ? length_[i] : length_func_()(key_[i])) != parent.depth)
cur = (array_u_type_)tmp[parent.depth] + 1;
if (prev > cur) {
error_ = -3;
return 0;
}
if (cur != prev || siblings.empty()) {
node_t tmp_node;
tmp_node.depth = parent.depth + 1;
tmp_node.code = cur;
tmp_node.left = i;
if (!siblings.empty()) siblings[siblings.size()-1].right = i;
siblings.push_back(tmp_node);
}
prev = cur;
}
if (!siblings.empty())
siblings[siblings.size()-1].right = parent.right;
return siblings.size();
}
size_t insert(const std::vector <node_t> &siblings) {
if (error_ < 0) return 0;
size_t begin = 0;
size_t pos = _max((size_t)siblings[0].code + 1, next_check_pos_) - 1;
size_t nonzero_num = 0;
int first = 0;
if (alloc_size_ <= pos) resize(pos + 1);
while (true) {
next:
++pos;
if (alloc_size_ <= pos) resize(pos + 1);
if (array_[pos].check) {
++nonzero_num;
continue;
} else if (!first) {
next_check_pos_ = pos;
first = 1;
}
begin = pos - siblings[0].code;
if (alloc_size_ <= (begin + siblings[siblings.size()-1].code))
resize(static_cast<size_t>(alloc_size_ *
_max(1.05, 1.0 * key_size_ / progress_)));
if (used_[begin]) continue;
for (size_t i = 1; i < siblings.size(); ++i)
if (array_[begin + siblings[i].code].check != 0) goto next;
break;
}
// -- Simple heuristics --
// if the percentage of non-empty contents in check between the index
// 'next_check_pos' and 'check' is greater than some constant
// value(e.g. 0.9),
// new 'next_check_pos' index is written by 'check'.
if (1.0 * nonzero_num/(pos - next_check_pos_ + 1) >= 0.95)
next_check_pos_ = pos;
used_[begin] = 1;
size_ = _max(size_,
begin +
static_cast<size_t>(siblings[siblings.size() - 1].code + 1));
for (size_t i = 0; i < siblings.size(); ++i)
array_[begin + siblings[i].code].check = begin;
for (size_t i = 0; i < siblings.size(); ++i) {
std::vector <node_t> new_siblings;
if (!fetch(siblings[i], new_siblings)) {
array_[begin + siblings[i].code].base =
value_ ?
static_cast<array_type_>(-value_[siblings[i].left]-1) :
static_cast<array_type_>(-siblings[i].left-1);
if (value_ && (array_type_)(-value_[siblings[i].left]-1) >= 0) {
error_ = -2;
return 0;
}
++progress_;
if (progress_func_)(*progress_func_)(progress_, key_size_);
} else {
size_t h = insert(new_siblings);
array_[begin + siblings[i].code].base = h;
}
}
return begin;
}
};
#if 4 == 2
typedef Darts::DoubleArrayImpl<char, unsigned char, short,
unsigned short> DoubleArray;
#define DARTS_ARRAY_SIZE_IS_DEFINED 1
#endif
#if 4 == 4 && !defined(DARTS_ARRAY_SIZE_IS_DEFINED)
typedef Darts::DoubleArrayImpl<char, unsigned char, int,
unsigned int> DoubleArray;
#define DARTS_ARRAY_SIZE_IS_DEFINED 1
#endif
#if 4 == 8 && !defined(DARTS_ARRAY_SIZE_IS_DEFINED)
typedef Darts::DoubleArrayImpl<char, unsigned char, long,
unsigned long> DoubleArray;
#define DARTS_ARRAY_SIZE_IS_DEFINED 1
#endif
#if 4 == 8 && !defined(DARTS_ARRAY_SIZE_IS_DEFINED)
typedef Darts::DoubleArrayImpl<char, unsigned char, long long,
unsigned long long> DoubleArray;
#endif
}
#endif