protected virtual IExpressionNode ParseConstantExpression()
{
object value = null;
if (Tokenizer.Token == TokenType.IntegerLiteral)
value = ParseIntegerLiteral();
else if (Tokenizer.Token == TokenType.RealLiteral)
value = ParseRealLiteral();
else if (Tokenizer.Token == TokenType.StringLiteral)
value = ParseStringLiteral();
else if (Tokenizer.Value.Equals(TrueLiteral, StringComparison.OrdinalIgnoreCase))
{
value = Empty.TrueObject;
NextToken(true);
}
else if (Tokenizer.Value.Equals(FalseLiteral, StringComparison.OrdinalIgnoreCase))
{
value = Empty.FalseObject;
NextToken(true);
}
else
NextToken(true);
var expr = new ConstantExpressionNode(value);
return expr;
}
private IExpressionNode GetResourceMember(IExpressionNode node, string memberName, IList<IExpressionNode> nodes)
{
IExpressionNode staticValue;
if (_staticNodes.TryGetValue(node, out staticValue))
return staticValue;
IBindingPath path = BindingServiceProvider.BindingPathFactory(memberName);
string firstMember = path.Parts[0];
Type type = BindingServiceProvider.ResourceResolver.ResolveType(firstMember, Context, false);
var resourceMember = (ResourceExpressionNode)nodes[0];
if (resourceMember.Dynamic && type == null)
{
memberName = BindingExtensions.MergePath(path.Parts.Skip(1).ToArray());
return GetOrAddBindingMember("$" + path.Path, (s, i) => new BindingMemberExpressionNode(firstMember, memberName, s, i));
}
bool dynamicMember = false;
IExpressionNode firstMemberNode = nodes[1];
if (!_staticNodes.TryGetValue(firstMemberNode, out staticValue))
{
if (type == null)
{
var resourceObject = BindingServiceProvider
.ResourceResolver
.ResolveObject(firstMember, Context, true);
var dynamicObject = resourceObject.Value as IDynamicObject;
if (dynamicObject == null || path.Parts.Count <= 1)
staticValue = new ConstantExpressionNode(resourceObject.Value);
else
{
staticValue = new ConstantExpressionNode(dynamicObject.GetMember(path.Parts[1], Empty.Array<object>()));
dynamicMember = true;
}
}
else
staticValue = new ConstantExpressionNode(type, typeof(Type));
_staticNodes[firstMemberNode] = staticValue;
if (dynamicMember)
_staticNodes[nodes[2]] = staticValue;
}
if (firstMemberNode == node || (dynamicMember && node == nodes[2]))
return staticValue;
return node;
}
IExpressionNode IExpressionVisitor.Visit(IExpressionNode node)
{
var methodCallExpressionNode = node as IMethodCallExpressionNode;
if (methodCallExpressionNode == null)
return node;
if (methodCallExpressionNode.Method == GetErrorsMethod &&
methodCallExpressionNode.Target is ResourceExpressionNode)
{
var paths = methodCallExpressionNode.Arguments
.OfType<IConstantExpressionNode>()
.Where(expressionNode => expressionNode.Type == typeof(string))
.Select(expressionNode => expressionNode.Value as string ?? string.Empty);
Guid id = Guid.NewGuid();
_errorPathNames[id] = paths.ToArray();
var idNode = new ConstantExpressionNode(id, typeof(Guid));
var args = methodCallExpressionNode.Arguments.ToList();
//Adding binding source member if the expression does not contain members.
if (args.Count == 0)
args.Add(new MemberExpressionNode(ResourceExpressionNode.DynamicInstance,
BindingServiceProvider.ResourceResolver.BindingSourceResourceName));
args.Insert(0, idNode);
return new MethodCallExpressionNode(methodCallExpressionNode.Target, methodCallExpressionNode.Method, args, methodCallExpressionNode.TypeArgs);
}
return node;
}
public IExpressionNode Visit(IExpressionNode node)
{
var member = node as IMemberExpressionNode;
if (member != null && member.Target is ResourceExpressionNode)
{
//$self, $this --> $BindingServiceProvider.ResourceResolver.SelfResourceName
if (member.Member == "self" || member.Member == "this")
return new MemberExpressionNode(member.Target, BindingServiceProvider.ResourceResolver.SelfResourceName);
//$context --> $BindingServiceProvider.ResourceResolver.DataContextResourceName
if (member.Member == "context")
return new MemberExpressionNode(member.Target, BindingServiceProvider.ResourceResolver.DataContextResourceName);
//$args, $arg --> $GetEventArgs()
if (member.Member == "args" || member.Member == "arg")
return new MethodCallExpressionNode(member.Target, DefaultBindingParserHandler.GetEventArgsMethod, null, null);
//$binding --> $GetBinding()
if (member.Member == "binding")
return new MethodCallExpressionNode(member.Target, DefaultBindingParserHandler.GetBindingMethod, null, null);
}
var methodCallExp = node as IMethodCallExpressionNode;
if (methodCallExp != null && methodCallExp.Target is ResourceExpressionNode)
{
//$OneTime(Expression) --> oneTimeImpl.GetValue(GetBinding(), () => Expression)
if (methodCallExp.Method == "OneTime" && methodCallExp.Arguments.Count == 1)
{
DataConstant<object> constant = Guid.NewGuid().ToString("n");
var idEx = new ConstantExpressionNode(constant);
var getBindEx = new MethodCallExpressionNode(ResourceExpressionNode.DynamicInstance, DefaultBindingParserHandler.GetBindingMethod, null, null);
IExpressionNode getValueEx = new LambdaExpressionNode(methodCallExp.Arguments[0], null);
return new MethodCallExpressionNode(new ConstantExpressionNode(typeof(BindingExtensions)), "GetOrAddValue", new[]
{
getBindEx, idEx, getValueEx
}, null).Accept(this);
}
//Alias ($Format(), $MethodName, etc) --> type.Format()
Type type;
string method;
if (BindingServiceProvider.ResourceResolver.TryGetMethodAlias(methodCallExp.Method, out type, out method))
return new MethodCallExpressionNode(new ConstantExpressionNode(type), method, methodCallExp.Arguments, methodCallExp.TypeArgs).Accept(this);
}
var nodes = new List<IExpressionNode>();
var members = new List<string>();
string memberName = node.TryGetMemberName(true, true, nodes, members);
if (memberName == null)
{
var relativeExp = nodes[0] as IRelativeSourceExpressionNode;
if (relativeExp != null)
{
relativeExp.MergePath(BindingExtensions.MergePath(members));
return relativeExp;
}
var methodCall = nodes[0] as IMethodCallExpressionNode;
if (methodCall != null && methodCall.Target is ResourceExpressionNode)
{
if (RelativeSourceAliases.Contains(methodCall.Method))
{
if ((methodCall.Arguments.Count == 1 || methodCall.Arguments.Count == 2) &&
methodCall.Arguments[0] is IMemberExpressionNode)
{
int level = 1;
var relativeType = (IMemberExpressionNode)methodCall.Arguments[0];
if (methodCall.Arguments.Count == 2)
level = (int)((IConstantExpressionNode)methodCall.Arguments[1]).Value;
return RelativeSourceExpressionNode.CreateRelativeSource(relativeType.Member, (uint)level,
BindingExtensions.MergePath(members));
}
}
if (ElementSourceAliases.Contains(methodCall.Method))
{
if (methodCall.Arguments.Count == 1 && methodCall.Arguments[0] is IMemberExpressionNode)
{
var elementSource = (IMemberExpressionNode)methodCall.Arguments[0];
return RelativeSourceExpressionNode.CreateElementSource(elementSource.Member,
BindingExtensions.MergePath(members));
}
}
}
}
return node;
}
