/// <summary>
/// Render the provided template.
/// </summary>
/// <param name="inputTemplate"></param>
/// <returns>
/// The rendered output of the template.
/// If the template is invalid, returns an error message or an empty string according to the current ExceptionHandlingStrategy setting.
/// </returns>
/// <remarks>This render method is compatible with the legacy DotLiquid implementation.</remarks>
public static LavaRenderResult RenderTemplate(string inputTemplate)
{
LavaRenderResult result;
if (_engine == null && _rockLiquidIsEnabled)
{
// If a Lava engine is not initialized, fall back to legacy DotLiquid.
result = new LavaRenderResult();
result.Text = inputTemplate.ResolveMergeFields(new Dictionary <string, object>());
return(result);
}
result = RenderTemplate(inputTemplate, LavaRenderParameters.Default);
return(result);
}
/// <summary>
/// Render the provided template in a new context with the specified merge fields.
/// </summary>
/// <param name="inputTemplate"></param>
/// <param name="mergeFields">The collection of merge fields to be added to the context used to render the template.</param>
/// <returns>
/// The rendered output of the template.
/// If the template is invalid, returns an error message or an empty string according to the current ExceptionHandlingStrategy setting.
/// </returns>
/// <remarks>This render method is compatible with the legacy DotLiquid implementation.</remarks>
public static LavaRenderResult RenderTemplate(string inputTemplate, IDictionary <string, object> mergeFields)
{
LavaRenderResult result;
if (_engine == null && _rockLiquidIsEnabled)
{
// If a Lava engine is not initialized, fall back to legacy DotLiquid.
// This allows developers to use a single method for basic template rendering that is backward-compatible with the RockLiquid implementation.
result = new LavaRenderResult();
result.Text = inputTemplate.ResolveMergeFields(mergeFields);
return(result);
}
result = RenderTemplate(inputTemplate, LavaRenderParameters.WithContext(_engine.NewRenderContext(mergeFields)));
return(result);
}
/// <summary>
/// Render the provided template using the specified parameters.
/// </summary>
/// <param name="inputTemplate"></param>
/// <param name="parameters"></param>
/// <returns>
/// The result of the render operation.
/// If the template is invalid, the Text property may contain an error message or an empty string according to the current ExceptionHandlingStrategy setting.
/// </returns>
public LavaRenderResult RenderTemplate(ILavaTemplate template, LavaRenderParameters parameters)
{
parameters = parameters ?? new LavaRenderParameters();
LavaRenderResult result;
LavaRenderParameters callParameters;
try
{
if (parameters == null)
{
callParameters = new LavaRenderParameters();
}
else if (parameters.Context == null)
{
callParameters = parameters.Clone();
callParameters.Context = NewRenderContext();
}
else
{
if (parameters.Context.GetType() == typeof(LavaRenderContext))
{
callParameters = parameters.Clone();
// Convert the default context to an engine-specific implementation.
var engineContext = NewRenderContext();
engineContext.SetInternalFields(parameters.Context.GetInternalFields());
engineContext.SetMergeFields(parameters.Context.GetMergeFields());
engineContext.SetEnabledCommands(parameters.Context.GetEnabledCommands());
// Create a copy of the parameters to ensure the input parameter remains unchanged.
callParameters.Context = engineContext;
}
else
{
callParameters = parameters;
}
}
result = OnRenderTemplate(template, callParameters);
if (result.Error != null)
{
result.Error = GetLavaRenderException(result.Error);
}
}
catch (LavaInterruptException)
{
// This exception is intentionally thrown by a component to halt the render process.
result = new LavaRenderResult();
result.Text = string.Empty;
}
catch (Exception ex)
{
if (ex is ThreadAbortException)
{
// Ignore this exception, the calling thread is terminating and no result is required.
return(null);
}
result = new LavaRenderResult();
var lre = GetLavaRenderException(ex);
string message;
ProcessException(lre, parameters.ExceptionHandlingStrategy, out message);
result.Error = lre;
result.Text = message;
}
return(result);
}
/// <summary>
/// Render the provided template using the specified parameters.
/// </summary>
/// <param name="inputTemplate"></param>
/// <param name="parameters"></param>
/// <returns>
/// The result of the render operation.
/// If the template is invalid, the Text property may contain an error message or an empty string according to the current ExceptionHandlingStrategy setting.
/// </returns>
public LavaRenderResult RenderTemplate(string inputTemplate, LavaRenderParameters parameters)
{
ILavaTemplate template;
LavaRenderParameters activeParameters;
// Copy the render parameters so they can be altered without affecting the input object.
if (parameters == null)
{
activeParameters = new LavaRenderParameters();
}
else
{
activeParameters = parameters.Clone();
}
var renderResult = new LavaRenderResult();
var exceptionStrategy = activeParameters.ExceptionHandlingStrategy ?? this.ExceptionHandlingStrategy;
try
{
if (_cacheService != null)
{
template = _cacheService.GetOrAddTemplate(this, inputTemplate, activeParameters.CacheKey);
}
else
{
template = null;
}
bool isParsed = (template != null);
if (!isParsed)
{
var parseResult = ParseTemplate(inputTemplate);
if (parseResult.HasErrors)
{
throw parseResult.Error;
}
template = parseResult.Template;
}
if (activeParameters.Context == null)
{
activeParameters.Context = NewRenderContext();
}
renderResult = RenderTemplate(template, activeParameters);
}
catch (Exception ex)
{
var lre = GetLavaRenderException(ex, inputTemplate);
string message;
if (ex is System.Threading.ThreadAbortException)
{
// If the requesting thread terminated unexpectedly, return an empty string.
// This may happen, for example, when a Lava template triggers a page redirect in a web application.
message = "{Request aborted}";
}
else
{
ProcessException(lre, exceptionStrategy, out message);
}
renderResult.Error = ex;
renderResult.Text = message;
}
return(renderResult);
}
