public static PathInfo Parse(string path)
{
if (path == "null")
{
return(Empty);
}
var originalPath = path;
var pathType = GetPathType(path);
var pathSubstring = new Substring(path);
var isValidHelperLiteral = true;
var isVariable = pathType == PathType.Variable;
var isInversion = pathType == PathType.Inversion;
var isBlockHelper = pathType == PathType.BlockHelper;
if (isVariable || isBlockHelper || isInversion)
{
isValidHelperLiteral = isBlockHelper || isInversion;
pathSubstring = new Substring(pathSubstring, 1);
}
var segments = new List <PathSegment>();
var pathParts = Substring.Split(pathSubstring, '/');
var extendedEnumerator = ExtendedEnumerator <Substring> .Create(pathParts);
while (extendedEnumerator.MoveNext())
{
var segment = extendedEnumerator.Current.Value;
if (segment.Length == 2 && segment[0] == '.' && segment[1] == '.')
{
isValidHelperLiteral = false;
segments.Add(new PathSegment(segment, ArrayEx.Empty <ChainSegment>()));
continue;
}
if (segment.Length == 1 && segment[0] == '.')
{
isValidHelperLiteral = false;
segments.Add(new PathSegment(segment, ArrayEx.Empty <ChainSegment>()));
continue;
}
var chainSegments = GetPathChain(segment);
if (chainSegments.Length > 1)
{
isValidHelperLiteral = false;
}
segments.Add(new PathSegment(segment, chainSegments));
}
if (isValidHelperLiteral && segments.Count > 1)
{
isValidHelperLiteral = false;
}
return(new PathInfo(pathType, originalPath, isValidHelperLiteral, segments.ToArray()));
}
private static void IterateObject(
BindingContext context,
EncodedTextWriter writer,
ObjectDescriptor descriptor,
ChainSegment[] blockParamsVariables,
object target,
IEnumerable properties,
Type targetType,
TemplateDelegate template,
TemplateDelegate ifEmpty)
{
using var innerContext = context.CreateFrame();
var iterator = new ObjectIteratorValues(innerContext);
var blockParams = new BlockParamsValues(innerContext, blockParamsVariables);
blockParams.CreateProperty(0, out var _0);
blockParams.CreateProperty(1, out var _1);
var accessor = new MemberAccessor(target, descriptor);
var enumerable = new ExtendedEnumerator <object>(properties.GetEnumerator());
var enumerated = false;
object iteratorValue;
ChainSegment iteratorKey;
while (enumerable.MoveNext())
{
enumerated = true;
var enumerableValue = enumerable.Current;
iteratorKey = ChainSegment.Create(enumerableValue.Value);
iterator.Key = iteratorKey;
iterator.Index = enumerableValue.Index;
if (enumerableValue.Index == 1)
{
iterator.First = BoxedValues.False;
}
if (enumerableValue.IsLast)
{
iterator.Last = BoxedValues.True;
}
iteratorValue = accessor[iteratorKey];
iterator.Value = iteratorValue;
innerContext.Value = iteratorValue;
blockParams[_0] = iteratorValue;
blockParams[_1] = iteratorKey;
template(writer, innerContext);
}
if (!enumerated)
{
innerContext.Value = context.Value;
ifEmpty(writer, innerContext);
}
}
public IExtendedEnumerator <Token> Filter(List <Token> input)
{
IExtendedEnumerator <Token> tokens = new ExtendedEnumerator <Token>(input);
foreach (ITokenFilter filter in this.filters)
{
tokens = filter.Filter(tokens);
}
return(tokens);
}
private static void IterateEnumerable(
BindingContext context,
EncodedTextWriter writer,
ChainSegment[] blockParamsVariables,
IEnumerable target,
TemplateDelegate template,
TemplateDelegate ifEmpty)
{
using var innerContext = context.CreateFrame();
var iterator = new IteratorValues(innerContext);
var blockParams = new BlockParamsValues(innerContext, blockParamsVariables);
blockParams.CreateProperty(0, out var _0);
blockParams.CreateProperty(1, out var _1);
var enumerator = new ExtendedEnumerator <object>(target.GetEnumerator());
var enumerated = false;
object boxedIndex;
object iteratorValue;
while (enumerator.MoveNext())
{
enumerated = true;
var enumerableValue = enumerator.Current;
if (enumerableValue.Index == 1)
{
iterator.First = BoxedValues.False;
}
if (enumerableValue.IsLast)
{
iterator.Last = BoxedValues.True;
}
boxedIndex = enumerableValue.Index;
iteratorValue = enumerableValue.Value;
iterator.Value = iteratorValue;
iterator.Index = boxedIndex;
blockParams[_0] = iteratorValue;
blockParams[_1] = boxedIndex;
innerContext.Value = iteratorValue;
template(writer, innerContext);
}
if (!enumerated)
{
innerContext.Value = context.Value;
ifEmpty(writer, innerContext);
}
}
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());
}
public static PathInfo Parse(string path)
{
if (path == "null")
{
return(Empty);
}
var originalPath = path;
var pathType = GetPathType(path);
var pathSubstring = new Substring(path);
var isValidHelperLiteral = true;
var isVariable = pathType == PathType.Variable;
var isInversion = pathType == PathType.Inversion;
var isBlockHelper = pathType == PathType.BlockHelper;
if (isVariable || isBlockHelper || isInversion)
{
isValidHelperLiteral = isBlockHelper || isInversion;
pathSubstring = new Substring(pathSubstring, 1);
}
var segments = new List <PathSegment>();
var pathParts = Substring.Split(pathSubstring, '/');
var extendedEnumerator = ExtendedEnumerator <Substring> .Create(pathParts);
using var container = StringBuilderPool.Shared.Use();
var buffer = container.Value;
while (extendedEnumerator.MoveNext())
{
var segment = extendedEnumerator.Current.Value;
if (buffer.Length != 0)
{
buffer.Append('/');
buffer.Append(in segment);
if (Substring.LastIndexOf(segment, ']', out var index) &&
!Substring.LastIndexOf(segment, '[', index, out _))
{
var chainSegment = GetPathChain(buffer.ToString());
if (chainSegment.Length > 1)
{
isValidHelperLiteral = false;
}
segments.Add(new PathSegment(segment, chainSegment));
buffer.Length = 0;
continue;
}
}
if (Substring.LastIndexOf(segment, '[', out var startIndex) &&
!Substring.LastIndexOf(segment, ']', startIndex, out _))
{
buffer.Append(in segment);
continue;
}
switch (segment.Length)
{
case 2 when segment[0] == '.' && segment[1] == '.':
