/// <summary>
/// Clones the ContextObject into a new Detached object
/// </summary>
/// <returns></returns>
public virtual ContextObject Clone()
{
var contextClone = new ContextObject(Options, Key, this) //note: Parent must be the original context so we can traverse up to an unmodified context
{
Value = Value,
IsNaturalContext = false
};
return(contextClone);
}
/// <summary>
/// ctor
/// </summary>
/// <param name="index">the current index of the item inside the collection</param>
/// <param name="last">true if its the last item</param>
/// <param name="options"></param>
/// <param name="key"></param>
public ContextCollection(long index,
bool last,
[NotNull] ParserOptions options,
string key,
[CanBeNull] ContextObject parent)
: base(options, key, parent)
{
Index = index;
Last = last;
}
/// <summary>
/// Clones the ContextObject into a new Detached object
/// </summary>
/// <returns></returns>
public virtual ContextObject Copy()
{
var contextClone = new ContextObject(Options, Key, Parent) //note: Parent must be the original context so we can traverse up to an unmodified context
{
Value = Value,
IsNaturalContext = true,
AbortGeneration = AbortGeneration
};
return(contextClone);
}
/// <summary>
/// Initializes a new instance of the <see cref="ContextObject"/> class.
/// </summary>
/// <param name="options">The options.</param>
/// <param name="key">The key as seen in the Template</param>
public ContextObject([NotNull] ParserOptions options, [NotNull] string key, [CanBeNull] ContextObject parent)
{
Options = options;
Key = key;
Parent = parent;
if (Parent != null)
{
CancellationToken = Parent.CancellationToken;
AbortGeneration = Parent.AbortGeneration;
}
IsNaturalContext = Parent?.IsNaturalContext ?? true;
}
/// <summary>
/// Clones the ContextObject into a new Detached object
/// </summary>
/// <returns></returns>
public virtual ContextObject Clone()
{
var contextClone = new ContextObject(Options, Key)
{
CancellationToken = CancellationToken,
Parent = Parent,
AbortGeneration = AbortGeneration,
Value = Value
};
return(contextClone);
}
/// <summary>
/// Will walk the path by using the path seperator "." and evaluate the object at the end
/// </summary>
/// <param name="path"></param>
/// <param name="scopeData"></param>
/// <returns></returns>
internal async Task <ContextObject> GetContextForPath(string path, ScopeData scopeData)
{
var elements = new Queue <string>();
foreach (var m in PathFinder.Matches(path).OfType <Match>())
{
elements.Enqueue(m.Value);
}
if (elements.Any())
{
//look at the first element if its an alias switch to that alias
var peekPathPart = elements.Peek();
if (scopeData.Alias.TryGetValue(peekPathPart, out var alias))
{
elements.Dequeue();
return(await alias.GetContextForPath(elements, scopeData));
}
//check if this part of the path can be seen as an number
if (Number.TryParse(peekPathPart, out var isNumber))
{
elements.Dequeue();
ContextObject contextObject;
if (elements.Count > 0)
{
var peekNextPathPart = elements.Peek();
if (Number.TryParse(peekPathPart
+ CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator
+ peekNextPathPart, out var floatingNumber))
{
elements.Dequeue();
contextObject = new ContextObject(Options, ".", this);
contextObject.Value = floatingNumber;
contextObject.IsNaturalContext = IsNaturalContext;
return(await contextObject.GetContextForPath(elements, scopeData));
}
}
contextObject = new ContextObject(Options, ".", this);
contextObject.Value = isNumber;
contextObject.IsNaturalContext = IsNaturalContext;
return(await contextObject.GetContextForPath(elements, scopeData));
}
}
return(await GetContextForPath(elements, scopeData));
}
/// <inheritdoc />
protected override ContextObject HandlePathContext(Queue <KeyValuePair <string, PathType> > elements,
KeyValuePair <string, PathType> path)
{
if (path.Value != PathType.DataPath)
{
return(null);
}
var innerContext = new ContextObject(Options, path.Key, this);
object value = null;
if (path.Key.Equals("$first"))
{
value = Index == 0;
}
else if (path.Key.Equals("$index"))
{
value = Index;
}
else if (path.Key.Equals("$middel"))
{
value = Index != 0 && !Last;
}
else if (path.Key.Equals("$last"))
{
value = Last;
}
else if (path.Key.Equals("$odd"))
{
value = Index % 2 != 0;
}
else if (path.Key.Equals("$even"))
{
value = Index % 2 == 0;
}
innerContext.Value = value;
return(value == null ? null : innerContext);
}
/// <inheritdoc />
protected override ContextObject HandlePathContext(Queue <string> elements, string path)
{
var innerContext = new ContextObject(Options, path);
innerContext.Parent = this;
object value = null;
if (path.Equals("$first"))
{
value = Index == 0;
}
else if (path.Equals("$index"))
{
value = Index;
}
else if (path.Equals("$middel"))
{
value = Index != 0 && !Last;
}
else if (path.Equals("$last"))
{
value = Last;
}
else if (path.Equals("$odd"))
{
value = Index % 2 != 0;
}
else if (path.Equals("$even"))
{
value = Index % 2 == 0;
}
innerContext.Value = value;
return(value == null ? null : innerContext);
}
private async Task <ContextObject> GetContextForPath(Queue <string> elements, ScopeData scopeData)
{
var retval = this;
if (elements.Any())
{
var path = elements.Dequeue();
var preHandeld = HandlePathContext(elements, path);
if (preHandeld != null)
{
return(preHandeld);
}
if (path.StartsWith("~")) //go the root object
{
var parent = Parent;
var lastParent = parent;
while (parent != null)
{
parent = parent.Parent;
if (parent != null)
{
lastParent = parent;
}
}
if (lastParent != null)
{
retval = await lastParent.GetContextForPath(elements, scopeData);
}
}
else if (path.Equals("$recursion")) //go the root object
{
retval = new ContextObject(Options, path, this)
{
Value = scopeData.PartialDepth.Count
};
}
else if (path.StartsWith("..")) //go one level up
{
if (Parent != null)
{
var parentsRetVal = (await(FindNextNaturalContextObject()?.Parent?.GetContextForPath(elements, scopeData) ?? Task.FromResult((ContextObject)null)));
if (parentsRetVal != null)
{
retval = parentsRetVal;
}
else
{
retval = await GetContextForPath(elements, scopeData);
}
}
else
{
retval = await GetContextForPath(elements, scopeData);
}
}
else
{
await EnsureValue();
var type = Value?.GetType();
if (path.StartsWith("?")) //enumerate ether an IDictionary, an cs object or an IEnumerable to a KeyValuePair array
{
//ALWAYS return the context, even if the value is null.
var innerContext = new ContextObject(Options, path, this);
switch (Value)
{
case IDictionary <string, object> dictList:
innerContext.Value = dictList.Select(e => e);
break;
//This is a draft that i have discarded as its more likely to enumerate a single IEnumerable with #each alone
//case IEnumerable ctx:
// innerContext.Value = ctx.OfType<object>().Select((item, index) => new KeyValuePair<string, object>(index.ToString(), item));
// break;
default:
{
if (Value != null)
{
innerContext.Value = type
.GetTypeInfo()
.GetProperties(BindingFlags.Instance | BindingFlags.Public)
.Where(e => !e.IsSpecialName && !e.GetIndexParameters().Any())
.Select(e => new KeyValuePair <string, object>(e.Name, e.GetValue(Value)));
}
break;
}
}
retval = await innerContext.GetContextForPath(elements, scopeData);
}
//TODO: handle array accessors and maybe "special" keys.
else
{
//ALWAYS return the context, even if the value is null.
var innerContext = new ContextObject(Options, path, this);
if (Options.ValueResolver?.CanResolve(type, Value, path, innerContext) == true)
{
innerContext.Value = Options.ValueResolver.Resolve(type, Value, path, innerContext);
}
else if (Value is IDictionary <string, object> ctx)
{
if (!ctx.TryGetValue(path, out var o))
{
Options.OnUnresolvedPath(path, type);
}
innerContext.Value = o;
}
else if (Value != null)
{
var propertyInfo = type.GetTypeInfo().GetProperty(path);
if (propertyInfo != null)
{
innerContext.Value = propertyInfo.GetValue(Value);
}
else
{
Options.OnUnresolvedPath(path, type);
}
}
retval = await innerContext.GetContextForPath(elements, scopeData);
}
}
}
return(retval);
}
private async Task <ContextObject> GetContextForPath(
Queue <KeyValuePair <string, PathType> > elements,
ScopeData scopeData)
{
var retval = this;
if (elements.Any())
{
var path = elements.Dequeue();
var preHandeld = HandlePathContext(elements, path);
if (preHandeld != null)
{
return(preHandeld);
}
var type = Value?.GetType();
if (path.Value == PathType.RootSelector) //go the root object
{
var parent = Parent ?? this;
var lastParent = parent;
while (parent != null)
{
parent = parent.Parent;
if (parent != null)
{
lastParent = parent;
}
}
if (lastParent != null)
{
retval = await lastParent.GetContextForPath(elements, scopeData);
}
}
else if (path.Value == PathType.ParentSelector) //go one level up
{
if (Parent != null)
{
var parentsRetVal = (await(FindNextNaturalContextObject()?.Parent?.GetContextForPath(elements, scopeData) ?? Task.FromResult((ContextObject)null)));
if (parentsRetVal != null)
{
retval = parentsRetVal;
}
else
{
retval = await GetContextForPath(elements, scopeData);
}
}
else
{
retval = await GetContextForPath(elements, scopeData);
}
}
else if (path.Value == PathType.ObjectSelector) //enumerate ether an IDictionary, an cs object or an IEnumerable to a KeyValuePair array
{
await EnsureValue();
if (Value is null)
{
return(Options.CreateContextObject("x:null", CancellationToken, null));
}
//ALWAYS return the context, even if the value is null.
ContextObject innerContext = null;
switch (Value)
{
case IDictionary <string, object> dictList:
innerContext = Options.CreateContextObject(path.Key, CancellationToken,
dictList.Select(e => e), this);
break;
default:
{
if (Value != null)
{
innerContext = Options.CreateContextObject(path.Key, CancellationToken,
type
.GetTypeInfo()
.GetProperties(BindingFlags.Instance | BindingFlags.Public)
.Where(e => !e.IsSpecialName && !e.GetIndexParameters().Any())
.Select(e => new KeyValuePair <string, object>(e.Name, e.GetValue(Value))),
this);
}
break;
}
}
retval = await innerContext.GetContextForPath(elements, scopeData);
}
else if (path.Value == PathType.Number)
{
//check if this part of the path can be seen as an number
if (Number.TryParse(path.Key, Options.CultureInfo, out var isNumber))
{
var contextObject = Options.CreateContextObject(".", CancellationToken, isNumber, this);
contextObject.IsNaturalContext = IsNaturalContext;
return(await contextObject.GetContextForPath(elements, scopeData));
}
}
else if (path.Value == PathType.Boolean)
{
if (path.Key == "true" || path.Key == "false")
{
var booleanContext = Options.CreateContextObject(".", CancellationToken, path.Key == "true", this);
booleanContext.IsNaturalContext = IsNaturalContext;
return(await booleanContext.GetContextForPath(elements, scopeData));
}
}
else if (path.Value == PathType.DataPath)
{
if (path.Key.Equals("$recursion")) //go the root object
{
retval = Options.CreateContextObject(path.Key, CancellationToken, scopeData.PartialDepth.Count, this);
}
else
{
await EnsureValue();
if (Value is null)
{
return(Options.CreateContextObject("x:null", CancellationToken, null));
}
//TODO: handle array accessors and maybe "special" keys.
else
{
//ALWAYS return the context, even if the value is null.
var innerContext = Options.CreateContextObject(path.Key, CancellationToken, null, this);
if (Options.ValueResolver?.CanResolve(type, Value, path.Key, innerContext) == true)
{
innerContext.Value = Options.ValueResolver.Resolve(type, Value, path.Key, innerContext);
}
else if (Value is IDictionary <string, object> ctx)
{
if (!ctx.TryGetValue(path.Key, out var o))
{
Options.OnUnresolvedPath(path.Key, type);
}
innerContext.Value = o;
}
else if (Value != null)
{
var propertyInfo = type.GetTypeInfo().GetProperty(path.Key);
if (propertyInfo != null)
{
innerContext.Value = propertyInfo.GetValue(Value);
}
else
{
Options.OnUnresolvedPath(path.Key, type);
}
}
retval = await innerContext.GetContextForPath(elements, scopeData);
}
}
}
}
return(retval);
}
