CAMLP4 TUTORIAL PDF

Camlp4 Deprecation Warning: this tutorial describes technology that is considered obsolete. It’s been replaced by extensions points and ppx rewriters. Camlp4 is part of the standard OCaml distribution and Camlp5 is distributed The title of the tutorial says Camlp4 but that is because it was written prior to the. Many of the tutorials below need updating and tutorials on many new topics are Camlp4 Tutorial (by Jake Donham), to build syntax extensions for OCaml with.

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The user defines a grammar using a special notation, and CamlP4 generates a parser for it.

Ambassador to the Computers: Reading Camlp4

Quotations and Abstract Syntax Quotations allow the programmer to treat a piece of code tutirial data instead of being part of the program itself. The ocaml beta announcement: It’s been replaced by extensions points and ppx rewriters Camlp4the OCaml “pre-processor pretty printer” is an advanced macro system which allows complex abstract syntax tree transformations on ocaml programs, and on other recursive decent grammars. Before attempting to learn CamlP4, it is recommended to learn how to program in OCaml reasonably well, and to have at least some familiarity with parsing and programming language tools.

It provides a camlp keywordmemowhich can be used as a replacement for function and provides automatic memoization camlp44 functions with pattern matching. Expanders can also generate strings instead of AST nodes, although this is less useful.

Camlp4 stands for Caml Preprocessor and Pretty-Printer and one of its most important applications is the definition of domain-specific extensions of the syntax of OCaml.

For now, there are no better options, so the only way out is to read both sources and try to integrate them mentally. The only thing to be aware of is that OCaml code inside quotations must use the revised syntax. I just found out about it as I was almost finished writing this post.

A syntax extension is defined by a compiled OCaml module, which is passed to the camlp4o executable along with the program to process. Retrieved from ” https: As demonstrated by the definition of a revised syntax for OCaml, the same programming language can use different concrete syntaxes. This CamlP5 tutorial by Martin Jambon is very good.

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Back to the Revised syntax: Instead, each template has gaps that must be filled with data which depends on the situation. Daniel de Rauglaudre wrote the original CamlP4, which was available for OCaml since its early versions.

A (meta-)guide to CamlP4: Metaprogramming in OCaml

Other target languages can also be used, such as C. The CamlP4 wiki has a page on quotationsand a page making uttorial analogy between quotations and strings. They are widely used in Lisp because of its uniform representation for code and data, and are widely used when programming in CamlP4 because they make it easier to generate code. Or read the CamlP4 sources, in this case tutoriap OCaml parsers. Given textual input, CamlP4 parses the input into an abstract syntax tree, which is tutoriwl printed in some format.

To learn how to use quotations to generate OCaml AST nodes, you can look at this appendix from the same manual. It provides a set of Caamlp4 libraries that are used to define grammars as well as loadable syntax extensions of such grammars. Besides the above-linked tutorials in the CamlP4 wiki, the section about grammars in the old manual is still very useful. To extend the OCaml parser, it may be useful to take a look at how it is defined for the standard syntax es.

OCaml tutorials

This page was last edited on 18 Novemberat This is similar to the way format strings work in printf-like functions. It can be output in a binary form, e. The wiki has a page with a simple extension for float expressions this extension uses a map over the AST to avoid having to rewrite many grammar productions.

To use this from the OCaml compilers, you just need to use the -pp command-line flag. The output of the program is as follows, showing that the fac function factorial only computes products that were not computed previously:. CamlP4 has an embedded notation for parser generation. Jake Donham has written a series of posts in his blog about CamlP4.

The new CamlP4 wiki has useful stuff, although it is incomplete both as a tutorial and as a reference. Sources and Final Thoughts CamlP4 gives OCaml programmers much of the power of metaprogramming available in Lisp languages, added with static type checking and customizable components.

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CamlP4 is mostly used as a metaprogramming tool for OCaml, but it can turorial used in many ways: As with most things in CamlP4, quotations are also customizable.

However, it is a quite complex piece of software and this is sometimes exposed to users. Camlp4 is a software system for writing extensible parsers for programming tutrial. For example, this piece of code: The topics are presented in the best order IMO, of course for learning, under this assumption. Grammars and Extensible Parsers: Camlp4the OCaml “pre-processor pretty printer” is an advanced macro system which allows complex abstract syntax tree transformations on ocaml programs, and on other recursive decent grammars.

Richard Jones posted an ttutorial in the official Caml-list for wrapping pattern matching in a predicate. The notion of concrete syntax refers to the format in which the abstract syntax is represented.

Conceptually, the plan is tutkrial The latter one is defined as an extension of the former, so you may need to consult both. If you know the revised syntax, you can start to use quotations to generate OCaml code. It is often used to write syntax extensions to OCaml, like adding support for a notation for monads or for list comprehensions. He also uses quotations in original syntax in the earlier parts, rendering the example code unusable in current versions of Tutoril in some cases he linked to newer versions that work.

CamlP4 gives OCaml programmers much of the power of metaprogramming available in Lisp languages, added with static type checking and customizable components. All of the examples below are for Camlp5 or the previous version of Camlp4 versions 3. De Rauglaudre maintains a separate backward-compatible version, which has been renamed Camlp5.

And now for the punchline: Camlp4 Wiki The ocaml beta announcement:

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