string Transform(string text, bool isOriginalText)
{
if (text == null)
{
throw new ArgumentNullException(nameof(text));
}
// Get a list of matches by order of the map
IDictionary <int, int> matches = MatchMap(text, isOriginalText);
// From the list of matches, rebuild the string
StringBuilder builder = new StringBuilder();
int textIdx = 0;
while (textIdx < text.Length)
{
if (!matches.ContainsKey(textIdx))
{
builder.Append(text[textIdx++]);
}
else
{
ReplacerEntry entry = map[matches[textIdx]];
string original = isOriginalText ? entry.Original : entry.Modified;
string modified = isOriginalText ? entry.Modified : entry.Original;
// Append the modified in the new string and skip the original
builder.Append(modified);
textIdx += original.Length;
}
}
return(builder.ToString());
}
/// <summary>
/// Add or replace an entry in the map.
/// </summary>
/// <param name="src">The source field for the entry.</param>
/// <param name="dst">The destination field for the entry.</param>
public void Add(string src, string dst)
{
if (string.IsNullOrEmpty(src))
{
throw new ArgumentNullException(nameof(src));
}
if (string.IsNullOrEmpty(dst))
{
throw new ArgumentNullException(nameof(dst));
}
int index = FindMapEntry(src, true);
if (index == -1)
{
map.Add(new ReplacerEntry(src, dst));
}
else
{
map[index] = new ReplacerEntry(src, dst);
}
}