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Modernizing legacy computer programs is challenging. This paper introduces a generalized framework for language transformation with three main elements. First, target languages are shielded from the transformation process by a collection of interfaces such as "create an if statement. " Transforming from Delphi is the same whether the target is Python, Java, C# or some other language that implements the interfaces. Second, the framework ensures synchronization between source language grammars and transformation tools, so changes to a grammar cannot be made without adjusting the impacted tools. This allows large scale transformation projects where both the grammars and the tools are under concurrent development. Third, source code generation is accomplished by adding output formatting annotations to the target language grammar.