private static ChainSegment ResolveMemberName(object instance, ChainSegment memberName, ICompiledHandlebarsConfiguration configuration)
{
var resolver = configuration.ExpressionNameResolver;
if (resolver == null)
{
return(memberName);
}
return(resolver.ResolveExpressionName(instance, memberName.TrimmedValue));
}
public static bool TryAccessMember(BindingContext context, object instance, ChainSegment chainSegment, out object value)
{
if (instance == null)
{
value = null;
return(false);
}
chainSegment = ResolveMemberName(instance, chainSegment, context.Configuration);
return(new ObjectAccessor(instance).TryGetValue(chainSegment, out value));
}
internal static bool TryAccessMember(object instance, ChainSegment chainSegment, ICompiledHandlebarsConfiguration configuration, out object value)
{
if (instance == null)
{
value = UndefinedBindingResult.Create(chainSegment);
return(false);
}
chainSegment = ResolveMemberName(instance, chainSegment, configuration);
return(new ObjectAccessor(instance).TryGetValue(chainSegment, out value));
}
private static ChainSegment[] GetPathChain(Substring segmentString)
{
var insideEscapeBlock = false;
var pathChainParts = Substring.Split(segmentString, '.', StringSplitOptions.RemoveEmptyEntries);
var extendedEnumerator = ExtendedEnumerator <Substring> .Create(pathChainParts);
if (!extendedEnumerator.Any && segmentString == ".")
{
return new[] { ChainSegment.This }
}
;
var chainSegments = new List <ChainSegment>();
while (extendedEnumerator.MoveNext())
{
var next = extendedEnumerator.Current.Value;
if (insideEscapeBlock)
{
if (next.EndsWith(']'))
{
insideEscapeBlock = false;
}
chainSegments[chainSegments.Count - 1] = ChainSegment.Create($"{chainSegments[chainSegments.Count - 1]}.{next.ToString()}");
continue;
}
if (next.StartsWith('['))
{
insideEscapeBlock = true;
}
if (next.EndsWith(']'))
{
insideEscapeBlock = false;
}
chainSegments.Add(ChainSegment.Create(next.ToString()));
}
return(chainSegments.ToArray());
}
private static IReadOnlyList <ChainSegment> GetPathChain(Substring segmentString)
{
var insideEscapeBlock = false;
var pathChainParts = Substring.Split(segmentString, '.', StringSplitOptions.RemoveEmptyEntries);
if (pathChainParts.Count == 0 && segmentString == ".")
{
return new[] { ChainSegment.This }
}
;
var chainSegments = new List <ChainSegment>();
var count = pathChainParts.Count;
for (int index = 0; index < count; index++)
{
var next = pathChainParts[index];
if (insideEscapeBlock)
{
if (next.EndsWith(']'))
{
insideEscapeBlock = false;
}
chainSegments[chainSegments.Count - 1] = ChainSegment.Create($"{chainSegments[chainSegments.Count - 1]}.{next.ToString()}");
continue;
}
if (next.StartsWith('['))
{
insideEscapeBlock = true;
}
if (next.EndsWith(']'))
{
insideEscapeBlock = false;
}
chainSegments.Add(ChainSegment.Create(next.ToString()));
}
return(chainSegments);
}
private static bool TryResolveValue(bool isVariable, BindingContext context, ChainSegment chainSegment, object instance, out object value)
{
if (isVariable)
{
return(context.TryGetContextVariable(chainSegment, out value));
}
if (chainSegment.IsThis)
{
value = context.Value;
return(true);
}
if (context.TryGetVariable(chainSegment, out value) ||
TryAccessMember(context, instance, chainSegment, out value))
{
return(true);
}
return(chainSegment.IsValue && context.TryGetContextVariable(chainSegment, out value));
}
private static bool ProcessSegment(BindingContext context, PathInfo pathInfo, bool isVariable, ChainSegment chainSegment, HashParameterDictionary hashParameters, ref object instance)
{
instance = ResolveValue(isVariable, context, instance, chainSegment);
if (!(instance is UndefinedBindingResult undefined))
{
return(true);
}
if (hashParameters == null || hashParameters.ContainsKey(chainSegment) || context.ParentContext == null)
{
if (context.Configuration.ThrowOnUnresolvedBindingExpression)
{
Throw.Undefined(pathInfo, undefined);
}
return(false); // return instance
}
instance = ResolveValue(isVariable, context.ParentContext, context.ParentContext.Value, chainSegment);
if (!(instance is UndefinedBindingResult result))
{
return(true);
}
if (context.Configuration.ThrowOnUnresolvedBindingExpression)
{
Throw.Undefined(pathInfo, result);
}
return(false); // return instance
}
private static object ResolveValue(bool isVariable, BindingContext context, object instance, ChainSegment chainSegment)
{
object resolvedValue;
if (isVariable)
{
return(context.TryGetContextVariable(chainSegment, out resolvedValue)
? resolvedValue
: UndefinedBindingResult.Create(chainSegment));
}
if (chainSegment.IsThis)
{
return(instance);
}
if (context.TryGetVariable(chainSegment, out resolvedValue) ||
TryAccessMember(instance, chainSegment, context.Configuration, out resolvedValue))
{
return(resolvedValue);
}
if (chainSegment.IsValue && context.TryGetContextVariable(chainSegment, out resolvedValue))
{
return(resolvedValue);
}
return(UndefinedBindingResult.Create(chainSegment));
}
