public (StringBuilder, StringReader) Execute(
string currentLine,
StringReader templateReader,
StringBuilder output,
IDictionary <string, object> model = null)
{
if (currentLine == null)
{
throw new ArgumentNullException(nameof(currentLine));
}
var forEachDetails = Regex.Match(currentLine, @"@foreach\s*\((?'criteria'.*)\)");
if (!forEachDetails.Success)
{
throw new MalformedException($"Malformed foreach statement: `{ currentLine }`.");
}
var loopCriteria = forEachDetails.Groups["criteria"].Value.Trim();
if (!loopCriteria.StartsWith("var"))
{
throw new MalformedException("Missing keyword `var`");
}
var variableRefs = Regex.Match(loopCriteria, @"var\s*(?'varName'[\w]+)\s*in\s*(?'collection'[\w.]+)");
if (!variableRefs.Success)
{
throw new MalformedException(loopCriteria);
}
var varName = variableRefs.Groups["varName"].Value;
var collectionNavProps = variableRefs.Groups["collection"].Value;
// resolve collection
if (!(model.GetReference(collectionNavProps) is ICollection collection))
{
throw new Exception($"`{ collectionNavProps }` isn't a valid collection");
}
// look for the loop statements.
var forBlock = BlockReader.ReadBlock(templateReader).ReadToEnd();
var engine = new RazorAlikeEngine();
foreach (var item in collection)
{
var iteratorModel = model.Clone();
iteratorModel.DefineVariable(varName, item);
var iterationOutput = engine.Run(forBlock, iteratorModel);
output.Append(iterationOutput.ToString());
}
return(output, templateReader);
}
public void MultipleBlockPositiveTests()
{
var reader = new StringReader(@"
{
{ BLOCK }
}!");
var blockReader = BlockReader.ReadBlock(reader);
Assert.AreEqual("{ BLOCK }", blockReader.ReadToEnd().Trim());
Assert.AreEqual('!', reader.Read());
}
public (StringBuilder, StringReader) Execute(
string currentLine,
StringReader templateReader,
StringBuilder output,
IDictionary <string, object> model = null)
{
var blockBody = BlockReader.ReadBlock(new StringReader(currentLine));
var engine = new RazorAlikeEngine();
var resolved = engine.Run(blockBody.ReadToEnd(), model);
output.AppendLine(resolved);
return(output, templateReader);
}