Editing Preprocessor (section)

===Extending a language===
The best examples of language extension through macros are found in the [[Lisp programming language|Lisp]] family of languages. While the languages, by themselves, are simple dynamically typed functional cores, the standard distributions of [[Scheme (programming language)|Scheme]] or [[Common Lisp]] permit imperative or object-oriented programming, as well as static typing. Almost all of these features are implemented by syntactic preprocessing, although it bears noting that the "macro expansion" phase of compilation is handled by the compiler in Lisp. This can still be considered a form of preprocessing, since it takes place before other phases of compilation.