IronRuby.Compiler.Ast.IfExpression.TransformRead C# (CSharp) Метод

        internal override MSA.Expression/*!*/ TransformRead(AstGenerator/*!*/ gen) {

            MSA.Expression result;

            int i = _elseIfClauses.Count - 1;

            if (i >= 0 && _elseIfClauses[i].Condition == null) {
                // ... else body end
                result = gen.TransformStatementsToExpression(_elseIfClauses[i].Statements);
                i--;
            } else {
                // no else clause => the result of the if-expression is nil:
                result = AstUtils.Constant(null);
            }

            while (i >= 0) {
                // emit: else (if (condition) body else result)
                result = AstFactory.Condition(
                    _elseIfClauses[i].Condition.TransformCondition(gen, true),
                    gen.TransformStatementsToExpression(_elseIfClauses[i].Statements),
                    result
                );
                i--;
            }

            // if (condition) body else result
            return AstFactory.Condition(
                _condition.TransformCondition(gen, true),
                gen.TransformStatementsToExpression(_body),
                result
            );
        }