private static IEnumerable<Snippet> BuildSnippets(Binding binding, BindingPrefixReference prefix, ElementNode element)
{
// this reference can use all attributes that start with it's prefix
var candidates = element.Attributes
.Where(attr => attr.Name.StartsWith(prefix.Prefix ?? ""));
// attributes that are matched by name, or by a longer prefix, no longer remain
var remaining = candidates
.Where(attr => binding.Nodes.Any(compare => TestBetterMatch(attr.Name, prefix.Prefix, compare)) == false);
// remaining attributes have a name that doesn't include the prefix characters
var attrs = remaining
.Select(attr => new { PropertyName = attr.Name.Substring((prefix.Prefix ?? "").Length), Attribute = attr });
var results = new List<Snippet>();
var first = true;
foreach (var attr in attrs)
{
if (first)
first = false;
else
results.Add(new Snippet { Value = "," });
results.Add(new Snippet { Value = attr.PropertyName + "=" });
if (prefix.AssumeStringValue)
{
var builder = new ExpressionBuilder();
PopulateBuilder(attr.Attribute.Nodes, builder);
results.Add(new Snippet { Value = builder.ToCode() });
}
else
{
results.AddRange(attr.Attribute.AsCode());
}
}
return results;
}
private static Binding ParseBinding(XElement element, BindingGrammar grammar)
{
var binding = new Binding
{
ElementName = (string)element.Attribute("name")
};
var start = element.Element("start");
var end = element.Element("end");
if (start != null && end != null)
{
binding.Phrases = new[]
{
ParsePhrase(start, grammar),
ParsePhrase(end, grammar)
};
}
else
{
binding.Phrases = new[]
{
ParsePhrase(element, grammar)
};
}
binding.HasChildReference = binding.Phrases
.SelectMany(phrase => phrase.Nodes)
.OfType<BindingChildReference>()
.Any();
if (binding.Phrases.Count() > 1 && binding.HasChildReference)
{
throw new CompilerException("Binding element '" + element.Attribute("name") +
"' can not have child::* in start or end phrases.");
}
return binding;
}
private static IEnumerable<Snippet> BuildSnippetsForNode(Binding binding, BindingNode node, ElementNode element)
{
if (node is BindingLiteral)
return BuildSnippets(node as BindingLiteral);
if (node is BindingNameReference)
return BuildSnippets(node as BindingNameReference, element);
if (node is BindingPrefixReference)
return BuildSnippets(binding, node as BindingPrefixReference, element);
throw new CompilerException("Binding node type " + node.GetType() + " not understood");
}
private static bool RequiredAttributesSatisfied(Binding binding, ElementNode element)
{
// any xpath targetting a flat name must be present, or the binding doesn't qualify
foreach (var reference in binding.Nodes.OfType<BindingNameReference>())
{
var nameReference = reference;
if (!element.Attributes.Any(attr => attr.Name == nameReference.Name))
return false;
}
return true;
}
