/// <summary>
/// Validates the templates function calls
/// </summary>
/// <param name="template">The template</param>
/// <returns>An array of errors</returns>
/// <remarks>
/// There are two steps to function validation:
///
/// 1) Check all function names are valid (i.e. matching function is found)
/// 2) Check the correct parameter values are supplied
/// </remarks>
public TemplateValidationError[] ValidateTemplate
(
Template template
)
{
Validate.IsNotNull(template);
var functionCalls = template.FindBlocks <FunctionCall>();
if (false == functionCalls.Any())
{
return(new TemplateValidationError[] { });
}
else
{
var errors = new List <TemplateValidationError>();
foreach (var call in functionCalls)
{
var exists = _functionRepository.FunctionExists
(
call.FunctionName
);
if (false == exists)
{
errors.Add
(
new TemplateValidationError
(
call,
"No function was found with the name '{0}'.".With
(
call.FunctionName
)
)
);
}
else
{
var function = _functionRepository.GetFunction
(
call.FunctionName
);
var parameters = function.GetAllParameters();
var values = call.ParameterValues;
if (parameters.Count() != values.Count())
{
var requiredParameters = function.GetRequiredParameters();
if (requiredParameters.Count() > values.Count())
{
errors.Add
(
new TemplateValidationError
(
call,
"One or more parameter values are missing for '{0}'.".With
(
call.FunctionName
)
)
);
}
}
var counter = 0;
if (parameters.Any())
{
foreach (var value in values)
{
if (counter < parameters.Count())
{
var matchingParameter = parameters.ElementAt
(
counter
);
var acceptsValue = matchingParameter.Accepts
(
value
);
if (false == acceptsValue)
{
errors.Add
(
new TemplateValidationError
(
call,
"The parameter value '{0}' is not valid.".With
(
call.FunctionName
)
)
);
}
}
counter++;
}
}
}
}
return(errors.ToArray());
}
}