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using System;
using Monodoc;
namespace macdoc
{
public class IndexSearcher
{
IndexReader index_reader;
public IndexSearcher (IndexReader indexReader)
{
this.index_reader = indexReader;
}
public int FindClosest (string text)
{
if (index_reader == null)
return -1;
int low = 0;
int top = index_reader.Rows-1;
int high = top;
int best_rate_idx = Int32.MaxValue, best_rate = -1;
while (low < high){
int mid = (high+low)/2;
int p = mid;
string s;
for (s = index_reader.GetValue (mid); s [0] == ' ';){
if (p == high){
if (p == low){
if (best_rate_idx != Int32.MaxValue)
return best_rate_idx;
else
return p;
}
high = mid;
break;
}
if (p < 0)
return 0;
s = index_reader.GetValue (++p);
}
if (s [0] == ' ')
continue;
int c, rate;
c = Rate (text, s, out rate);
if (rate > best_rate){
best_rate = rate;
best_rate_idx = p;
}
if (c == 0)
return mid;
if (low == high){
if (best_rate_idx != Int32.MaxValue)
return best_rate_idx;
else
return low;
}
if (c < 0)
high = mid;
else {
if (low == mid)
low = high;
else
low = mid;
}
}
return high;
}
int Rate (string user_text, string db_text, out int rate)
{
int c = String.Compare (user_text, db_text, true);
if (c == 0){
rate = 0;
return 0;
}
int i;
for (i = 0; i < user_text.Length; i++){
if (db_text [i] != user_text [i]){
rate = i;
return c;
}
}
rate = i;
return c;
}
public IndexEntry GetIndexEntry (int idx)
{
if (index_reader == null || idx >= index_reader.Rows || idx < 0)
return null;
return index_reader.GetIndexEntry (idx);
}
public IndexReader Index {
get {
return index_reader;
}
set {
index_reader = value;
}
}
}
}
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