public FilterClause(string filterString)
{
if (filterString == null)
{
filterString = string.Empty;
}
var match = StartsWithRegex.Match(filterString);
if (match.Success)
{
// startswith(field-name, 'value')
this.Predicate = (v) => v.StartsWith(match.Groups[2].Value);
}
else
{
match = ContainsRegex.Match(filterString);
if (match.Success)
{
// contains(field-name, 'value')
this.Predicate = (v) => v.Contains(match.Groups[2].Value);
}
else
{
match = EqRegex.Match(filterString);
if (match.Success)
{
// field-name eq 'value'
string value = match.Groups[2].Value;
this.Predicate = (v) =>
{
return(value == "null" ? string.IsNullOrEmpty(v) : v == value);
};
}
}
}
if (this.Predicate != null)
{
this.FieldName = match.Groups[1].Value;
}
}
public FilterClause(string filterString)
{
if (filterString == null)
{
filterString = string.Empty;
}
var match = StartsWithRegex.Match(filterString);
if (match.Success)
{
// startswith(field-name, 'value') eq true|false
bool result = true;
if (match.Groups.Count > 4)
{
result = match.Groups[4].Value != "false";
}
string arg = match.Groups[2].Value;
this.Predicate = (v) => v.StartsWith(arg) == result;
}
else
{
match = ContainsRegex.Match(filterString);
if (match.Success)
{
// contains(field-name, 'value') eq true|false
bool result = true;
if (match.Groups.Count > 4)
{
result = match.Groups[4].Value != "false";
}
string arg = match.Groups[2].Value;
this.Predicate = (v) => v.Contains(arg) == result;
}
else
{
match = EqRegex.Match(filterString);
if (match.Success)
{
// field-name eq|ne 'value'
string value = match.Groups[3].Value;
string op = match.Groups[2].Value;
this.Predicate = (v) =>
{
bool res = value == "null" ? string.IsNullOrEmpty(v) : v == value;
return(op == "ne" ? !res : res);
};
}
}
}
if (this.Predicate != null)
{
this.FieldName = match.Groups[1].Value;
}
}
private void ExtractPredicate(string filterString)
{
// startswith(field-name, 'value') eq true|false
var match = StartsWithRegex.Match(filterString);
if (match.Success)
{
bool result = true;
if (match.Groups.Count > 4)
{
result = match.Groups[4].Value != "false";
}
string arg = match.Groups[2].Value;
this.Predicate = (v) => v.StartsWith(arg) == result;
}
// contains(field-name, 'value') eq true|false
else if ((match = ContainsRegex.Match(filterString)).Success)
{
bool result = true;
if (match.Groups.Count > 4)
{
result = match.Groups[4].Value != "false";
}
string arg = match.Groups[2].Value;
this.Predicate = (v) => v.Contains(arg) == result;
}
// field-name eq|ne 'value'
else if ((match = EqRegex.Match(filterString)).Success)
{
string value = match.Groups[3].Value;
string op = match.Groups[2].Value;
this.Predicate = (v) =>
{
bool res = value == "null" ? string.IsNullOrEmpty(v) : v == value;
return(op == "ne" ? !res : res);
};
}
// field-name in ('value1','value2','value3')
else if ((match = InRegex.Match(filterString)).Success)
{
string value = match.Groups[2].Value.Trim();
string[] values;
if (value.StartsWith("'"))
{
values = LazyQuotesRegex.Matches(value)
.Select(m => m.Groups[1].Value)
.ToArray();
}
else
{
values = match.Groups[2].Value
.Split(',').Where(s => !string.IsNullOrEmpty(s))
.Select(s => s.Trim(' ', '\''))
.ToArray();
}
if ((match.Groups.Count) > 4 && (match.Groups[4].Value == "false"))
{
this.Predicate = (v) => !values.Contains(v);
}
else
{
this.Predicate = (v) => values.Contains(v);
}
}
if (this.Predicate != null)
{
this.FieldName = match.Groups[1].Value;
}
}
