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using System;
using System.Diagnostics;
using System.Linq;
namespace DSACore.Auxiliary
{
public class SpellCorrect : StringComparer
{
public const int ErrorThreshold = 94100;
public override int Compare(string x, string y)
{
return CompareEasy(x, y);
}
public static int CompareEasy(string x, string y)
{
if (string.IsNullOrEmpty(x)) throw new ArgumentException("message", nameof(x));
if (string.IsNullOrEmpty(y)) throw new ArgumentException("message", nameof(y));
if (x.Equals(y)) return 0;
x = x.ToLower();
y = y.ToLower();
if (x.Equals(y)) return 1;
var subs = y.Split(' ', '/');
var score = subs.Count();
foreach (var s in subs)
if (s.Equals(x))
score--;
if (score < subs.Count()) return score + 1;
return 100000 - (int) (CompareExact(x, y) * 1000.0);
/*if (y.Contains(x))
return 6;*/
}
public override bool Equals(string x, string y)
{
Debug.Assert(x != null, nameof(x) + " != null");
return x.Equals(y);
}
public override int GetHashCode(string obj)
{
throw new NotImplementedException();
}
public static double CompareExact(string s, string q)
{
s = s.ToLower();
q = q.ToLower();
int i, j;
const double Match = 3.0;
const double Gap = -2.0;
const double Mismatch = -2.0;
double decay;
var matrix = new double[s.Length + 1, q.Length + 1];
var max = 0.0;
matrix[0, 0] = 0.0;
for (i = 1; i < s.Length; i++)
// matrix[i, 0] = 0.0;
matrix[i, 0] = i * Gap;
for (i = 1; i < q.Length; i++) matrix[0, i] = 0.0;
for (i = 1; i <= s.Length; i++)
for (j = 1; j <= q.Length; j++)
{
decay = j / (double) (s.Length * 1000);
var add = s[i - 1] == q[j - 1] ? Match - decay : Mismatch;
var score = matrix[i - 1, j - 1] + add;
if (score < matrix[i - 1, j] + Gap) score = matrix[i - 1, j] + Gap;
if (score < matrix[i, j - 1] + Gap) score = matrix[i, j - 1] + Gap;
if (i > 1 && j > 1)
if (s[i - 1] == q[j - 2] && s[i - 2] == q[j - 1])
{
add = 3 / 2.0 * Match - decay;
if (score < matrix[i - 2, j - 2] + add) score = matrix[i - 2, j - 2] + add;
}
// if (score < 0)
// {
// score = 0;
// }
if (max < score && i == s.Length) max = score;
matrix[i, j] = score;
}
return max;
}
}
}
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