/// <summary>
/// NOTE: Code-generation-invoked method, method name and parameter order matters
/// </summary>
/// <param name="text">regex pattern</param>
/// <returns>pattern</returns>
public static Regex ExprRegexNodeCompilePattern(string text)
{
try {
return RegexExtensions.Compile(text, out string patternText);
}
catch (ArgumentException ex) {
throw new EPException("Failed to compile regex pattern '" + text + "': " + ex.Message, ex);
}
}
public override ExprNode Validate(ExprValidationContext validationContext)
{
if (ChildNodes.Length != 2) {
throw new ExprValidationException("The regexp operator requires 2 child expressions");
}
// check pattern child node
var patternChildType = ChildNodes[1].Forge.EvaluationType;
if (patternChildType != typeof(string)) {
throw new ExprValidationException("The regexp operator requires a String-type pattern expression");
}
var constantPattern = ChildNodes[1].Forge.ForgeConstantType.IsCompileTimeConstant;
// check eval child node - can be String or numeric
var evalChildType = ChildNodes[0].Forge.EvaluationType;
var isNumericValue = TypeHelper.IsNumeric(evalChildType);
if ((evalChildType != typeof(string)) && (!isNumericValue)) {
throw new ExprValidationException(
"The regexp operator requires a String or numeric type left-hand expression");
}
if (constantPattern) {
var patternText = (string) ChildNodes[1].Forge.ExprEvaluator.Evaluate(null, true, null);
Regex pattern;
try {
pattern = RegexExtensions.Compile(patternText, out patternText);
}
catch (ArgumentException ex) {
throw new ExprValidationException(
"Failed to compile regex pattern '" + patternText + "': " + ex.Message,
ex);
}
var patternInit = NewInstance<Regex>(Constant(patternText));
_forge = new ExprRegexpNodeForgeConst(this, isNumericValue, pattern, patternInit);
}
else {
_forge = new ExprRegexpNodeForgeNonconst(this, isNumericValue);
}
return null;
}