/// <summary>
/// Removes the affix suffix rule entry for the word if valid.
/// </summary>
/// <param name="word">
/// The word to be modified.
/// </param>
/// <param name="entry">
/// The affix rule entry to use.
/// </param>
/// <returns>
/// The word after affix removed. Will be the same word if affix could not be removed.
/// </returns>
/// <remarks>
/// This method does not verify that the returned word is a valid word, only that the affix can be removed.
/// </remarks>
public static string RemoveSuffix(string word, AffixEntry entry)
{
int tempLength = word.Length - entry.AddCharacters.Length;
if ((tempLength > 0) &&
(tempLength + entry.StripCharacters.Length >= entry.ConditionCount) &&
(endsWith(word, entry.AddCharacters)))
{
// word with out affix
string tempWord = word.Substring(0, tempLength);
// add back strip chars
tempWord += entry.StripCharacters;
// check that this is valid
for (int i = 0, j = tempWord.Length - entry.ConditionCount; i < entry.ConditionCount; i++, j++)
{
int charCode = tempWord[j];
if ((entry.Condition[charCode] & (1 << i)) == 0)
{
return(null);
}
}
return(tempWord);
}
return(null);
}
/// <summary>
/// Generates the condition character array.
/// </summary>
/// <param name="conditionText" type="string">
/// The text form of the conditions.
/// </param>
/// <param name="entry">
/// The <see cref="AffixEntry"/> to add the condition array to.
/// </param>
public static void EncodeConditions(string conditionText, AffixEntry entry)
{
// clear the conditions array
for (int i = 0; i < entry.Condition.Length; i++)
{
entry.Condition[i] = 0;
}
// if no condition just return
if (conditionText == ".")
{
entry.ConditionCount = 0;
return;
}
bool neg = false; /* complement indicator */
bool group = false; /* group indicator */
bool end = false; /* end condition indicator */
int num = 0; /* number of conditions */
char[] memberChars = new char[200];
int numMember = 0; /* number of member in group */
foreach (char cond in conditionText)
{
// parse member group
if (cond == '[')
{
group = true; // start a group
}
else if (cond == '^' && group)
{
neg = true; // negative group
}
else if (cond == ']')
{
end = true; // end of a group
}
else if (group)
{
// add chars to group
memberChars[numMember] = cond;
numMember++;
}
else
{
end = true; // no group
}
// set condition
if (end)
{
if (group)
{
if (neg)
{
// turn all chars on
for (int j = 0; j < entry.Condition.Length; j++)
{
entry.Condition[j] = entry.Condition[j] | (1 << num);
}
// turn off chars in member group
for (int j = 0; j < numMember; j++)
{
int charCode = memberChars[j];
entry.Condition[charCode] = entry.Condition[charCode] & ~(1 << num);
}
}
else
{
// turn on chars in member group
for (int j = 0; j < numMember; j++)
{
int charCode = memberChars[j];
entry.Condition[charCode] = entry.Condition[charCode] | (1 << num);
}
}
group = false;
neg = false;
numMember = 0;
} // if group
else
{
if (cond == '.')
{
// wild card character, turn all chars on
for (int j = 0; j < entry.Condition.Length; j++)
{
entry.Condition[j] = entry.Condition[j] | (1 << num);
}
}
else
{
// turn on char
int charCode = cond;
entry.Condition[charCode] = entry.Condition[charCode] | (1 << num);
}
} // not group
end = false;
num++;
} // if end
} // foreach char
entry.ConditionCount = num;
return;
}