SearchOperand ParseAndExpression()
{
SearchOperand op1 = ParseAndGExpression();
SearchOperand op2;
while (pos != searchRequest.Text.Length && searchRequest.Text[pos] == ' ')
{
pos++;
}
while (pos != searchRequest.Text.Length && (searchRequest.Text[pos] == '*' || searchRequest.Text[pos] == '^'))
{
switch (searchRequest.Text[pos])
{
case '*':
pos++;
op2 = ParseAndGExpression();
op1.Add(op2, "*");
break;
case '^':
pos++;
op2 = ParseAndGExpression();
op1.Add(op2, "^");
break;
}
}
return(op1);
}
SearchOperand ParseOrExpression()
{
SearchOperand op1 = ParseAndExpression();
SearchOperand op2;
while (pos != searchRequest.Text.Length && searchRequest.Text[pos] == ' ')
{
pos++;
}
while (pos != searchRequest.Text.Length && searchRequest.Text[pos] == '+')
{
pos++;
op2 = ParseAndExpression();
op1.Add(op2, "+");
}
return(op1);
}
SearchOperand ParseAnd_Expression()
{
SearchOperand op1 = ParseTerm();
SearchOperand op2;
while (pos != searchRequest.Text.Length && searchRequest.Text[pos] == ' ')
{
pos++;
}
while (pos != searchRequest.Text.Length && searchRequest.Text[pos] == '.')
{
pos++;
if (pos == searchRequest.Text.Length || searchRequest.Text[pos] != ' ')
{
throw new RequestParsingException();
}
op2 = ParseTerm();
op1.Add(op2, ". ");
}
return(op1);
}