/// <summary>
/// Get all operators from user input text.
/// </summary>
/// <param name="userInputText">User input text.</param>
/// <param name="invertedIndex">The inverted index that we are going to run operators on it.</param>
/// <returns>List of all operators order by priority.</returns>
public static List <IOperator> GetAllOperators(string userInputText, InvertedIndex invertedIndex)
{
var operatorExtractor = new OperatorExtractor(userInputText);
var operators = new List <IOperator>();
while (!operatorExtractor.EndOfText())
{
operators.Add(operatorExtractor.GetNextOperator(invertedIndex));
}
return(operators.OrderBy(op => op.Priority).ToList());
}
public List <string> Filter(List <string> inputList)
{
if (inputList == null || inputList.Count == 0)
{
return(new List <string>());
}
var tokenDocumentIDs = new List <string>();
InvertedIndex.TryGetTokenDocumentIDs(Token, out tokenDocumentIDs);
inputList.RemoveAll(item => tokenDocumentIDs.Contains(item));
return(inputList);
}
/// <summary>
/// Get next operator from user input text.
/// </summary>
/// <param name="invertedIndex">The inverted index that we are going to run operators on it.</param>
/// <returns>Next operator from user Input text.</returns>
public IOperator GetNextOperator(InvertedIndex invertedIndex)
{
var operatorToken = tokens[pointer++];
switch (operatorToken[0])
{
case '+': return(new Or(operatorToken.Substring(1), invertedIndex));
case '-': return(new Not(operatorToken.Substring(1), invertedIndex));
default: return(new And(operatorToken, invertedIndex));
}
}
public List <string> Filter(List <string> inputList)
{
if (inputList == null || inputList.Count == 0)
{
return(new List <string>());
}
List <string> tokenDocumentIDs;
if (InvertedIndex.TryGetTokenDocumentIDs(Token, out tokenDocumentIDs))
{
return(inputList.Intersect(tokenDocumentIDs).ToList());
}
return(new List <string>());
}
public List <string> Filter(List <string> inputList)
{
if (inputList == null)
{
inputList = new List <string>();
}
List <string> tokenDocuments;
if (InvertedIndex.TryGetTokenDocumentIDs(Token, out tokenDocuments))
{
inputList = inputList.Union(tokenDocuments).ToList();
}
return(inputList);
}
static void Main(string[] args)
{
IUserInterface ui = new ConsoleUI();
var dataPath = ui.UserDataPath;
var fileReader = new FileReader(dataPath);
var directoryData = fileReader.GetRawData();
var invertedIndex = new InvertedIndex();
foreach (KeyValuePair <string, string> pair in directoryData)
{
invertedIndex.InsertDatas(Tokenizer.GetAllTokens(pair.Key, pair.Value));
}
var userInputText = ui.UserInput;
var operators = OperatorExtractor.GetAllOperators(userInputText, invertedIndex);
var result = new Searcher().RunOperators(operators);
ui.ShowOutput(result);
}
public And(string token, InvertedIndex invertedIndex)
{
Token = token;
InvertedIndex = invertedIndex;
}