private static IEnumerable<UtokenControl> BlockIndentationToUtokenControlAfter(BlockIndentation blockIndentation)
{
if (blockIndentation == BlockIndentation.Indent)
yield return UtokenControl.DecreaseIndentLevel;
else if (blockIndentation == BlockIndentation.Unindent)
yield return UtokenControl.IncreaseIndentLevel;
else if (blockIndentation == BlockIndentation.ZeroIndent)
yield return UtokenControl.RestoreIndentLevel;
}
public Params(BlockIndentation blockIndentation, InsertedUtokens insertedUtokensAfter)
{
this.blockIndentation = blockIndentation;
this.insertedUtokensAfter = insertedUtokensAfter;
}
private static IEnumerable<UtokenControl> BlockIndentationToUtokenControlBefore(BlockIndentation blockIndentation)
{
if (blockIndentation == BlockIndentation.Indent)
yield return UtokenControl.IncreaseIndentLevel;
else if (blockIndentation == BlockIndentation.Unindent)
yield return UtokenControl.DecreaseIndentLevel;
else if (blockIndentation == BlockIndentation.ZeroIndent)
yield return UtokenControl.SetIndentLevelToNone;
}
/// <exception cref="UnparsableAst.NonCalculatedException">
/// If topLeft is non-calculated or thrown out.
/// </exception>
private static IEnumerable<UtokenBase> _YieldIndentation(UnparsableAst self, ref BlockIndentation blockIndentationParameter, Unparser.Direction direction,
FormatYielder formatYielder, bool left)
{
if (!left && direction == Unparser.Direction.RightToLeft && blockIndentationParameter.IsDeferred() && blockIndentationParameter.LeftDeferred != null)
{
/*
* We are in a right-to-left unparse and this deferred right indentation depends on a deferred left indentation,
* so let's try to calculate the deferred left indentation, which - if succeed - will change the shared blockIndentation
* object state from deferred to a valid indentation.
*
* (If the left indentation wasn't deferred then it would be calculated which means that the shared blockIndentation
* object won't be deferred.)
* */
blockIndentationParameter.LeftDeferred.CalculateUtokens();
// either CalculateUtokens succeeded, and blockIndentation is not deferred, or CalculateUtokens threw a NonCalculatedException exception
Debug.Assert(!blockIndentationParameter.IsDeferred(), "CalculateUtokens succeeded, but blockIndentation remained deferred");
}
if (blockIndentationParameter == BlockIndentation.ToBeSet || blockIndentationParameter.IsDeferred())
{
UnparsableAst leftObject = GetLeftTerminalLeave(self);
BlockIndentation blockIndentation = formatYielder._GetBlockIndentation(leftObject, self);
// NOTE: topAncestorCacheForLeft gets updated by GetUsedLeftsFromTopToBottomB
if (blockIndentation != BlockIndentation.IndentNotNeeded)
Unparser.tsUnparse.Debug("blockindentation {0} for leftTarget '{1}' and for target '{2}'", blockIndentation, leftObject, self);
Debug.Assert(!blockIndentation.IsDeferred());
if (blockIndentationParameter == BlockIndentation.ToBeSet)
blockIndentationParameter = blockIndentation;
else
blockIndentationParameter.CopyKindFrom(blockIndentation);
}
if (direction == Unparser.Direction.LeftToRight)
{
return left
? BlockIndentationToUtokenControlBefore(blockIndentationParameter)
: BlockIndentationToUtokenControlAfter(blockIndentationParameter);
}
else
{
return left
? BlockIndentationToUtokenControlAfter(blockIndentationParameter)
: BlockIndentationToUtokenControlBefore(blockIndentationParameter);
}
}
/// <exception cref="UnparsableAst.NonCalculatedException">
/// If topLeft is non-calculated or thrown out.
/// </exception>
private static IEnumerable<UtokenBase> _YieldIndentation(UnparsableAst self, BlockIndentation blockIndentationParameter, Unparser.Direction direction,
FormatYielder formatYielder, bool left)
{
#if DEBUG
BlockIndentation originalBlockIndentationParameter = blockIndentationParameter;
#endif
var utokens = _YieldIndentation(self, ref blockIndentationParameter, direction, formatYielder, left);
#if DEBUG
Debug.Assert(object.ReferenceEquals(blockIndentationParameter, originalBlockIndentationParameter),
string.Format("unwanted change of blockIndentationParameter reference in _YieldIndentation ({0})", left ? "left" : "right"));
#endif
return utokens;
}
private IEnumerable<UtokenBase> YieldIndentationRight(UnparsableAst self, ref BlockIndentation blockIndentation)
{
Unparser.tsUnparse.Debug("YieldIndentationRight");
try
{
// NOTE: topAncestorCacheForLeft may get updated by YieldIndentation
// NOTE: ToList is needed to fully evaluate the called function, so we can catch the exception
return _YieldIndentation(self, ref blockIndentation, direction, formatYielder: this, left: false).ToList();
}
catch (NonCalculatedException)
{
// top left node or someone in the chain is non-calculated -> defer execution
Debug.Assert(blockIndentation == BlockIndentation.ToBeSet || blockIndentation.IsDeferred());
if (blockIndentation == BlockIndentation.ToBeSet)
blockIndentation = BlockIndentation.Defer();
Debug.Assert(blockIndentation.IsDeferred());
BlockIndentation _blockIndentation = blockIndentation;
return new[]
{
blockIndentation.RightDeferred = new DeferredUtokens(
() => _YieldIndentation(self, _blockIndentation, direction, formatYielder: this, left: false),
self: self,
helpMessage: "YieldIndentationRight",
helpCalculatedObject: _blockIndentation
)
};
}
}
private IEnumerable<UtokenBase> YieldIndentationRight(UnparsableAst self, BlockIndentation blockIndentation)
{
#if DEBUG
BlockIndentation originalBlockIndentation = blockIndentation;
#endif
var utokens = YieldIndentationRight(self, ref blockIndentation);
#if DEBUG
Debug.Assert(object.ReferenceEquals(blockIndentation, originalBlockIndentation), "unwanted change of blockIndentationParameter reference in YieldIndentationRight");
#endif
return utokens;
}