public ConditionParser(String condition, FullTextSearchOptions options)
{
ConditionStream stream = new ConditionStream(condition, options);
this.options = options;
rootExpression = new ConditionExpression(options);
currentExpression = rootExpression;
Reset();
while (stream.Read())
{
if (ConditionOperator.IsSymbol(stream.Current))
{
PutToken();
SetToken(stream.Current);
PutToken();
continue;
}
switch (stream.Current)
{
case ' ': PutToken(); continue;
case '(': PushExpression(); continue;
case ')': PopExpression(); continue;
case '"':
PutToken();
inQuotes = true;
SetToken(stream.ReadQuote());
PutToken();
inQuotes = false;
continue;
}
AddToken(stream.Current);
}
PutToken();
if (!object.ReferenceEquals(rootExpression, currentExpression))
{
if ((options & FullTextSearchOptions.ThrowOnUnbalancedParens) != 0)
{
throw new InvalidOperationException("Unbalanced parentheses.");
}
}
}
public ConditionExpression AddSubexpression(ConditionOperator op)
{
ConditionOperator newOp = op;
if (op == ConditionOperator.Near)
{
if ((options & FullTextSearchOptions.ThrowOnInvalidNearUse) != 0)
{
throw new InvalidOperationException("Invalid near operator before subexpression.");
}
newOp = ConditionOperator.And;
}
ConditionExpression exp = new ConditionExpression(this, newOp);
subexpressions.Add(exp);
return(exp);
}
private ConditionExpression(ConditionExpression parent, ConditionOperator op, string term)
: this(parent, op)
{
this.term = term;
isTerm = true;
isPhrase = (term.IndexOf(' ') != -1);
int prefixIndex = term.IndexOf('*');
isPrefix = (prefixIndex != -1);
if (!isPrefix)
{
return;
}
if (!isPhrase)
{
if ((options & FullTextSearchOptions.TrimPrefixTerms) == 0)
{
return;
}
if (prefixIndex == (term.Length - 1))
{
return;
}
this.term = (prefixIndex == 0) ? "" : term.Remove(prefixIndex + 1);
return;
}
if ((options & FullTextSearchOptions.TrimPrefixPhrases) == 0)
{
return;
}
term = Regex.Replace(term, @"(\*[^ ]+)|(\*)", "");
term = Regex.Replace(term.Trim(), @"[ ]{2,}", " ");
this.term = term + "*";
}
public string ReadQuote()
{
StringBuilder sb = new StringBuilder();
while (Read())
{
if (Current.Equals('"'))
{
if ((index + 1) == condition.Length)
{
index = condition.Length;
return(sb.ToString());
}
char peek = condition[index + 1];
if ((peek == ' ') || (peek == ')') || (peek == '(') || (ConditionOperator.IsSymbol(peek)))
{
return(sb.ToString());
}
if (peek == '"')
{
index += 1;
}
else
{
if ((options & FullTextSearchOptions.ThrowOnUnbalancedQuotes) != 0)
{
return(sb.ToString());
}
}
}
sb.Append(Current);
}
if ((options & FullTextSearchOptions.ThrowOnUnbalancedQuotes) != 0)
{
throw new InvalidOperationException("Unbalanced quotes.");
}
return(sb.ToString());
}
private bool Equals(ConditionOperator obj)
{
return(value == obj.value);
}
private ConditionExpression(ConditionExpression parent, ConditionOperator op) : this(parent.options)
{
index = parent.subexpressions.Count;
this.parent = parent;
this.op = op;
}
private void Reset()
{
ResetToken();
lastOp = ConditionOperator.And;
}