private (object value, string error) EvalByAdaptiveExpression(string exp, object scope, ParserRuleContext expressionContext)
{
var currentTemplate = CurrentTemplate();
if (currentTemplate != null)
{
var source = currentTemplate.SourceRange.Source;
if (expressionContext != null && _lgOptions.OnEvent != null)
{
var lineOffset = currentTemplate.SourceRange.Range.Start.Line;
var sourceRange = new SourceRange(expressionContext, source, lineOffset);
var expressionRef = new ExpressionRef(exp, sourceRange);
var expression = currentTemplate.Expressions.FirstOrDefault(u => u.GetId() == expressionRef.GetId());
if (expression != null)
{
_lgOptions.OnEvent(expression, new BeginExpressionEvaluationArgs {
Source = source, Expression = exp
});
}
}
}
var parse = this.ExpressionParser.Parse(exp);
var opt = new Options
{
Locale = _lgOptions.Locale,
NullSubstitution = _lgOptions.NullSubstitution
};
var result = parse.TryEvaluate(scope, opt);
if (currentTemplate != null && _lgOptions.OnEvent != null)
{
string text;
if (string.IsNullOrEmpty(result.error))
{
text = $"Evaluate expression '{exp}' get result: {result.value}";
}
else
{
text = $"Evaluate expression '{exp}' get error: {result.error}";
}
_lgOptions.OnEvent(currentTemplate, new MessageArgs {
Source = currentTemplate.SourceRange.Source, Text = text
});
}
return(result);
}
private void FillInExpression(ParserRuleContext expressionContext)
{
if (expressionContext == null)
{
return;
}
var exp = expressionContext.GetText().TrimExpression();
var lineOffset = this._template.SourceRange.Range.Start.Line;
var sourceRange = new SourceRange(expressionContext, _template.SourceRange.Source, lineOffset);
var expressionRef = new ExpressionRef(exp, sourceRange);
_template.Expressions.Add(expressionRef);
}
