[Ironruby-core] Code Review: AstImprovements

Tomas Matousek Tomas.Matousek at microsoft.com
Tue Dec 8 20:21:42 EST 2009

  tfpt review "/shelveset:AstImprovements;REDMOND\tomat"
  Comment  : 
  Adds ExpressionCollectionBuilder (moves the implementation from IronRuby). This allows to construct optimized expressions via C# initializer syntax. Adds a subclass BlockBuilder that can be used to build blocks like so:
  Expression result = new BlockBuilder {
      (condition) ? foo : null,
  If the expression used in the initializer is null it is skipped.
  If the expression is a sequence of expressions (IEnumerable<Expression>) its content is included in the block.
  BlockBuilder defines an implicit conversion to Expression.
  Tree transformation refactorings:
  -	Replaces some AstFactory utility methods with AstUtils equivalents.
  -	Creates Lambda<T> explicitly to avoid calls to MakeGenericType.
  -	Uses BlockBuilder for building complex blocks.

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