/// <summary>
/// Returns true if the given pre-processed expression evaluates to true.
/// </summary>
/// <param name="preprocExpression"></param>
/// <param name="definedFunc"></param>
/// <returns></returns>
/// <exception cref="Exception"></exception>
public static bool IsExpressionTrue(string preprocExpression, Func<string, int> definedFunc = null) {
preprocExpression = preprocExpression.Trim().ToLower();
preprocExpression = ReplaceDefinedFunction(preprocExpression, definedFunc, out bool usedDefinedProc);
if (ExpressionResults.ContainsKey(preprocExpression)) {
return ExpressionResults[preprocExpression];
}
if (CanEvaluateFromString(preprocExpression, out bool result)) {
if (!usedDefinedProc) { // defined() depends on the current context (which var is defined at this line), so don't store.
ExpressionResults.Add(preprocExpression, result);
}
return result;
}
if (!string.IsNullOrEmpty(ProEnvironment.Current?.ProwinPath)) {
var dlcPath = Path.Combine(Path.GetDirectoryName(ProEnvironment.Current.ProwinPath) ?? "", "..");
using (var ev = new UoePreprocessedExpressionEvaluator(dlcPath)) {
result = ev.IsTrue(preprocExpression);
ExpressionResults.Add(preprocExpression, result);
return result;
}
}
throw new Exception($"Could not evaluate expression: {preprocExpression}.");
}
/// <summary>
/// Matches a &IF expression &THEN pre-processed statement (extractes the evaluated expression in BlockDescription)
/// </summary>
private ParsedScopePreProcIfBlock CreateParsedIfEndIfPreProc(Token ifToken, bool lastPreProcIfBlockWasTrue)
{
List <Token> expressionTokens;
StringBuilder expression = new StringBuilder();
bool expressionResult;
// do we need to extract an expression from this IF/ELSEIF? (or is it an ELSE)
if (ifToken.Value.ToLower().EndsWith("if"))
{
expressionTokens = new List <Token>();
int i = 0;
do
{
i++;
// need to replace in case we use for instance a {&var} in a scope-define value
ReplaceIncludeAndPreprocVariablesAhead(i + 1);
var token = PeekAt(i);
if (token is TokenComment)
{
continue;
}
if (token is TokenEof)
{
break;
}
if (token is TokenPreProcDirective)
{
break;
}
expressionTokens.Add(token);
} while (true);
// we directly set the new token position there (it will be just 1 token before the &THEN)
_tokenPos += i - 1;
AddLineInfo(PeekAt(0));
// since we didn't use MoveNext we also manually replace the includes ahead
ReplaceIncludeAndPreprocVariablesAhead(2);
foreach (var token in expressionTokens)
{
expression.Append(token.Value);
}
try {
expressionResult = !lastPreProcIfBlockWasTrue && UoePreprocessedExpressionEvaluator.IsExpressionTrue(expression.ToString(), s => {
return(_parsedIncludes[ifToken.OwnerNumber].GetScopedPreProcVariableDefinedLevel(s));
});
} catch (Exception e) {
ErrorHandler.LogError(e);
expressionResult = false;
}
}
else
{
// it's an &ELSE
expressionResult = !lastPreProcIfBlockWasTrue;
}
var newIf = new ParsedScopePreProcIfBlock(ifToken.Value, ifToken)
{
EvaluatedExpression = expression.ToString().Trim(),
ExpressionResult = expressionResult
};
AddParsedItem(newIf, ifToken.OwnerNumber);
return(newIf);
}
