private void CheckTemplateReference(string templateName, IEnumerable <Expression> children)
{
if (!this.TemplateMap.ContainsKey(templateName))
{
throw new Exception(TemplateErrors.TemplateNotExist(templateName));
}
var expectedArgsCount = this.TemplateMap[templateName].Parameters.Count();
var actualArgsCount = children.Count();
if (actualArgsCount != 0 && expectedArgsCount != actualArgsCount)
{
throw new Exception(TemplateErrors.ArgumentMismatch(templateName, expectedArgsCount, actualArgsCount));
}
}
/// <summary>
/// Evaluate a template with given name and scope.
/// </summary>
/// <param name="inputTemplateName">template name.</param>
/// <param name="scope">scope.</param>
/// <returns>Evaluate result.</returns>
public object EvaluateTemplate(string inputTemplateName, object scope)
{
if (!(scope is CustomizedMemory))
{
scope = new CustomizedMemory(SimpleObjectMemory.Wrap(scope));
}
(var reExecute, var templateName) = ParseTemplateName(inputTemplateName);
if (!TemplateMap.ContainsKey(templateName))
{
throw new Exception(TemplateErrors.TemplateNotExist(templateName));
}
if (evaluationTargetStack.Any(e => e.TemplateName == templateName))
{
throw new Exception($"{TemplateErrors.LoopDetected} {string.Join(" => ", evaluationTargetStack.Reverse().Select(e => e.TemplateName))} => {templateName}");
}
var templateTarget = new EvaluationTarget(templateName, scope);
var currentEvaluateId = templateTarget.GetId();
EvaluationTarget previousEvaluateTarget = null;
if (evaluationTargetStack.Count != 0)
{
previousEvaluateTarget = evaluationTargetStack.Peek();
if (!reExecute && previousEvaluateTarget.EvaluatedChildren.ContainsKey(currentEvaluateId))
{
return(previousEvaluateTarget.EvaluatedChildren[currentEvaluateId]);
}
}
// Using a stack to track the evaluation trace
evaluationTargetStack.Push(templateTarget);
var result = Visit(TemplateMap[templateName].ParseTree);
if (previousEvaluateTarget != null)
{
previousEvaluateTarget.EvaluatedChildren[currentEvaluateId] = result;
}
evaluationTargetStack.Pop();
return(result);
}
private void ValidTemplateReference(Expression expression)
{
var templateName = expression.Type;
if (!this.TemplateMap.ContainsKey(templateName))
{
throw new Exception(TemplateErrors.TemplateNotExist(templateName));
}
var expectedArgsCount = this.TemplateMap[templateName].Parameters.Count();
var actualArgsCount = expression.Children.Length;
if (expectedArgsCount != actualArgsCount)
{
throw new Exception(TemplateErrors.ArgumentMismatch(templateName, expectedArgsCount, actualArgsCount));
}
}
/// <summary>
/// Expand the results of a template with given name and scope.
/// </summary>
/// <param name="templateName">Given template name.</param>
/// <param name="scope">Given scope.</param>
/// <returns>All possiable results.</returns>
public List <object> ExpandTemplate(string templateName, object scope)
{
if (!(scope is CustomizedMemory))
{
scope = new CustomizedMemory(scope);
}
if (!TemplateMap.ContainsKey(templateName))
{
throw new Exception(TemplateErrors.TemplateNotExist(templateName));
}
if (evaluationTargetStack.Any(e => e.TemplateName == templateName))
{
throw new Exception($"{TemplateErrors.LoopDetected} {string.Join(" => ", evaluationTargetStack.Reverse().Select(e => e.TemplateName))} => {templateName}");
}
// Using a stack to track the evaluation trace
evaluationTargetStack.Push(new EvaluationTarget(templateName, scope));
var expanderResult = Visit(TemplateMap[templateName].TemplateBodyParseTree);
evaluationTargetStack.Pop();
var result = new List <object>();
expanderResult.ForEach(u =>
{
if (lgOptions.LineBreakStyle == LGLineBreakStyle.Markdown && u is string str)
{
result.Add(Evaluator.NewLineRegex.Replace(str, "$1$1"));
}
else
{
result.Add(u);
}
});
return(result);
}
/// <summary>
/// Analyzes a template to get the static analyzer results.
/// </summary>
/// <param name="templateName">Template name.</param>
/// <returns>Analyze result including variables and template references.</returns>
public AnalyzerResult AnalyzeTemplate(string templateName)
{
var missingName = !_templateMap.ContainsKey(templateName);
var stackHasName = _evaluationTargetStack.Any(e => e.TemplateName == templateName);
if (_analyzerOptions?.ThrowOnRecursive == true)
{
if (missingName)
{
throw new ArgumentException(TemplateErrors.TemplateNotExist(templateName));
}
if (stackHasName)
{
throw new InvalidOperationException($"{TemplateErrors.LoopDetected} {string.Join(" => ", _evaluationTargetStack.Reverse().Select(e => e.TemplateName))} => {templateName}");
}
}
if (missingName || stackHasName)
{
return(new AnalyzerResult());
}
// Using a stack to track the evaluation trace
_evaluationTargetStack.Push(new EvaluationTarget(templateName, null));
// we don't exclude parameters any more
// because given we don't track down for templates have parameters
// the only scenario that we are still analyzing an parameterized template is
// this template is root template to analyze, in this we also don't have exclude parameters
var dependencies = Visit(_templateMap[templateName].TemplateBodyParseTree);
_evaluationTargetStack.Pop();
return(dependencies);
}
/// <summary>
/// Analyzer a template to get the static analyzer results.
/// </summary>
/// <param name="templateName">Template name.</param>
/// <returns>Analyze result including variables and template references.</returns>
public AnalyzerResult AnalyzeTemplate(string templateName)
{
if (!templateMap.ContainsKey(templateName))
{
throw new Exception(TemplateErrors.TemplateNotExist(templateName));
}
if (evaluationTargetStack.Any(e => e.TemplateName == templateName))
{
throw new Exception($"{TemplateErrors.LoopDetected} {string.Join(" => ", evaluationTargetStack.Reverse().Select(e => e.TemplateName))} => {templateName}");
}
// Using a stack to track the evaluation trace
evaluationTargetStack.Push(new EvaluationTarget(templateName, null));
// we don't exclude parameters any more
// because given we don't track down for templates have parameters
// the only scenario that we are still analyzing an parameterized template is
// this template is root template to analyze, in this we also don't have exclude parameters
var dependencies = Visit(templateMap[templateName].TemplateBodyParseTree);
evaluationTargetStack.Pop();
return dependencies;
}
/// <summary>
/// Evaluate a template with given name and scope.
/// Throws errors if certain errors detected <see cref="TemplateErrors"/>.
/// </summary>
/// <param name="inputTemplateName">Template name.</param>
/// <param name="scope">Scope.</param>
/// <returns>Evaluate result.</returns>
public object EvaluateTemplate(string inputTemplateName, object scope)
{
var memory = scope is CustomizedMemory scopeMemory ? scopeMemory : new CustomizedMemory(scope);
(var reExecute, var templateName) = ParseTemplateName(inputTemplateName);
if (!TemplateMap.ContainsKey(templateName))
{
throw new ArgumentException(TemplateErrors.TemplateNotExist(templateName));
}
var templateTarget = new EvaluationTarget(templateName, memory);
var currentEvaluateId = templateTarget.GetId();
if (_evaluationTargetStack.Any(e => e.GetId() == currentEvaluateId))
{
throw new InvalidOperationException($"{TemplateErrors.LoopDetected} {string.Join(" => ", _evaluationTargetStack.Reverse().Select(e => e.TemplateName))} => {templateName}");
}
object result = null;
var hasResult = false;
if (!reExecute)
{
if (_lgOptions.CacheScope == LGCacheScope.Global)
{
if (_cachedResult.ContainsKey(currentEvaluateId))
{
result = _cachedResult[currentEvaluateId];
hasResult = true;
}
}
else if (_lgOptions.CacheScope == null || _lgOptions.CacheScope == LGCacheScope.Local)
{
EvaluationTarget previousEvaluateTarget = null;
if (CurrentTemplate() != null)
{
previousEvaluateTarget = CurrentTarget();
if (previousEvaluateTarget.CachedEvaluatedChildren.ContainsKey(currentEvaluateId))
{
result = previousEvaluateTarget.CachedEvaluatedChildren[currentEvaluateId];
hasResult = true;
}
}
}
}
if (!hasResult)
{
_evaluationTargetStack.Push(templateTarget);
var currentTemplate = CurrentTemplate();
_lgOptions.OnEvent?.Invoke(currentTemplate, new BeginTemplateEvaluationArgs {
Source = currentTemplate.SourceRange.Source, TemplateName = templateName
});
result = Visit(TemplateMap[templateName].TemplateBodyParseTree);
if (_lgOptions.OnEvent != null)
{
var text = $"Evaluate template [{templateName}] get result: {result}";
_lgOptions.OnEvent(currentTemplate, new MessageArgs {
Source = currentTemplate.SourceRange.Source, Text = text
});
}
_evaluationTargetStack.Pop();
if (!reExecute)
{
if (_lgOptions.CacheScope == LGCacheScope.Global)
{
_cachedResult[currentEvaluateId] = result;
}
else if (_lgOptions.CacheScope == null || _lgOptions.CacheScope == LGCacheScope.Local)
{
if (_evaluationTargetStack.Count > 0)
{
_evaluationTargetStack.Peek().CachedEvaluatedChildren[currentEvaluateId] = result;
}
}
}
}
return(result);
}
