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#include <cstring>
#include "vararray.hpp"
#include "typo_editdist.hpp"
#include "config.hpp"
#include "language.hpp"
#include "file_data_util.hpp"
#include "getdata.hpp"
#include "cache-t.hpp"
#include "asc_ctype.hpp"
// edit_distance is implemented using a straight forward dynamic
// programming algorithm with out any special tricks. Its space
// usage AND running time is tightly asymptotically bounded by
// strlen(a)*strlen(b)
typedef unsigned char uchar;
namespace aspeller {
using namespace std;
short typo_edit_distance(ParmString word0,
ParmString target0,
const TypoEditDistanceInfo & w)
{
int word_size = word0.size() + 1;
int target_size = target0.size() + 1;
const uchar * word = reinterpret_cast<const uchar *>(word0.str());
const uchar * target = reinterpret_cast<const uchar *>(target0.str());
VARARRAY(short, e_d, word_size * target_size);
ShortMatrix e(word_size,target_size, e_d);
e(0,0) = 0;
for (int j = 1; j != target_size; ++j)
e(0,j) = e(0,j-1) + w.missing;
--word;
--target;
short te;
for (int i = 1; i != word_size; ++i) {
e(i,0) = e(i-1,0) + w.extra_dis2;
for (int j = 1; j != target_size; ++j) {
if (word[i] == target[j]) {
e(i,j) = e(i-1,j-1);
} else {
te = e(i,j) = e(i-1,j-1) + w.repl(word[i],target[j]);
if (i != 1) {
te = e(i-1,j ) + w.extra(word[i-1], target[j]);
if (te < e(i,j)) e(i,j) = te;
te = e(i-2,j-1) + w.extra(word[i-1], target[j])
+ w.repl(word[i] , target[j]);
if (te < e(i,j)) e(i,j) = te;
} else {
te = e(i-1,j) + w.extra_dis2;
if (te < e(i,j)) e(i,j) = te;
}
te = e(i,j-1) + w.missing;
if (te < e(i,j)) e(i,j) = te;
//swap
if (i != 1 && j != 1) {
te = e(i-2,j-2) + w.swap
+ w.repl(word[i], target[j-1])
+ w.repl(word[i-1], target[j]);
if (te < e(i,j)) e(i,j) = te;
}
}
}
}
return e(word_size-1,target_size-1);
}
static GlobalCache<TypoEditDistanceInfo> typo_edit_dist_info_cache("keyboard");
PosibErr<void> setup(CachePtr<const TypoEditDistanceInfo> & res,
const Config * c, const Language * l, ParmString kb)
{
PosibErr<TypoEditDistanceInfo *> pe = get_cache_data(&typo_edit_dist_info_cache, c, l, kb);
if (pe.has_err()) return pe;
res.reset(pe.data);
return no_err;
}
struct CharPair {
char d[2];
CharPair(char a, char b) {d[0] = a; d[1] = b;}
};
PosibErr<TypoEditDistanceInfo *>
TypoEditDistanceInfo::get_new(const char * kb, const Config * cfg, const Language * l)
{
FStream in;
String file, dir1, dir2;
fill_data_dir(cfg, dir1, dir2);
find_file(file, dir1, dir2, kb, ".kbd");
RET_ON_ERR(in.open(file.c_str(), "r"));
ConvEC iconv;
RET_ON_ERR(iconv.setup(*cfg, "utf-8", l->charmap(), NormFrom));
Vector<CharPair> data;
char to_stripped[256];
for (int i = 0; i <= 255; ++i)
to_stripped[i] = l->to_stripped(i);
String buf;
DataPair d;
while (getdata_pair(in, d, buf)) {
if (d.key == "key") {
PosibErr<char *> pe(iconv(d.value.str, d.value.size));
if (pe.has_err())
return pe.with_file(file, d.line_num);
char * v = pe.data;
char base = *v;
while (*v) {
to_stripped[(uchar)*v] = base;
++v;
while (asc_isspace(*v)) ++v;
}
} else {
PosibErr<char *> pe(iconv(d.key.str, d.key.size));
if (pe.has_err())
return pe.with_file(file, d.line_num);
char * v = pe.data;
if (strlen(v) != 2)
return make_err(invalid_string, d.key.str).with_file(file, d.line_num);
to_stripped[(uchar)v[0]] = v[0];
to_stripped[(uchar)v[1]] = v[1];
data.push_back(CharPair(v[0], v[1]));
}
}
TypoEditDistanceInfo * w = new TypoEditDistanceInfo();
w->keyboard = kb;
memset(w->to_normalized_, 0, sizeof(w->to_normalized_));
int c = 1;
for (int i = 0; i <= 255; ++i) {
if (l->is_alpha(i)) {
if (w->to_normalized_[(uchar)to_stripped[i]] == 0) {
w->to_normalized_[i] = c;
w->to_normalized_[(uchar)to_stripped[i]] = c;
++c;
} else {
w->to_normalized_[i] = w->to_normalized_[(uchar)to_stripped[i]];
}
}
}
for (int i = 0; i != 256; ++i) {
if (w->to_normalized_[i]==0) w->to_normalized_[i] = c;
}
w->max_normalized = c;
c = w->max_normalized + 1;
int cc = c * c;
w->data = (short *)malloc(cc * 2 * sizeof(short));
w->repl .init(c, c, w->data);
w->extra.init(c, c, w->data + cc);
for (int i = 0; i != c; ++i) {
for (int j = 0; j != c; ++j) {
w->repl (i,j) = w->repl_dis2;
w->extra(i,j) = w->extra_dis2;
}
}
for (unsigned i = 0; i != data.size(); ++i) {
const char * d = data[i].d;
w->repl (w->to_normalized(d[0]),
w->to_normalized(d[1])) = w->repl_dis1;
w->repl (w->to_normalized(d[1]),
w->to_normalized(d[0])) = w->repl_dis1;
w->extra(w->to_normalized(d[0]),
w->to_normalized(d[1])) = w->extra_dis1;
w->extra(w->to_normalized(d[1]),
w->to_normalized(d[0])) = w->extra_dis1;
}
for (int i = 0; i != c; ++i) {
w->repl(i,i) = 0;
w->extra(i,i) = w->extra_dis1;
}
return w;
}
}
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