Recent changes to Home

WikiPage Home modified by Axel Gehlert

Axel Gehlert — Sat, 03 Dec 2011 11:15:23 -0000

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 RAG Pattern replacer
 ====================
 
+The first release v0.1 is on its way
+------------------------------------
+
+Only a few more preparation steps have to be taken and v0.1 is ready.
+v0.1 will be a working but first draft version of rag pr to play around with.
+The aim is to find possible usability improvements and to test the pr language syntax.
+
+v0.1 will not be production ready but i am sure you can write first simple useful pr scripts.
+Be aware that some language features may change in the future so you have to port your scripts to new rag pr versions in the future.
+
+Take a look on the sample scripts in the code folder example_scripts to get a first impression of the language.
+
+By the way: You can make the cmd line tool print the pr script syntax by executing 
+
+    rag --print-syntax 
+
+Get more info by executing:
+
+    rag --help
+
+
+
 Whats can i use the pattern replacer for?
 -----------------------------------------

WikiPage Home modified by Axel Gehlert

Axel Gehlert — Tue, 27 Sep 2011 19:43:16 -0000

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-Welcome to your wiki!
-
-This is the default page, edit it as you see fit. To add a page simply reference it within brackets, e.g.: [SamplePage].
-
-The wiki uses [Markdown](/p/ragpr/home/markdown_syntax/) syntax.
+[[project_admins]]
+[[download_button]]
+
+RAG Pattern replacer
+====================
+
+Whats can i use the pattern replacer for?
+-----------------------------------------
+
+* Extract any kind of information out of input files
+* Filter input files
+* Convert ASCII file formats
+* Quickly develop your own DSL (Domain-Specific-Language)
+* Write code generators
+* ...
+
+
+How does it work?
+-----------------
+
+In order to use rag pr, you need to write a pattern replacer script that
+
+1) Defines the syntax of the input file (the "patterns")
+2) Defines the actions to be taken depending in the input
+
+The pattern-replacer-language is a simple OOP-Language that allows you to
+
+* Define your own syntax rules and/ or regexps
+* Do simple pattern-replacement operations based on "default replacements" and user-defined replacement on syntax-rule-level
+* Define classes and methods if you need more than just syntax rules and replacements
+* Use syntax rules like classes
+* Use everything as an object
+
+
+Is it like awk?
+---------------
+
+Yes and no.
+
+Like awk, rag pr 
+
+* applies patterns/ regexps to an input file and performs the actions defined in the script whenever a pattern is recognized.
+
+Unlike awk, rag pr
+
+* needs a complete syntax description for the input file as a the "patterns".
+* first reads the input file completely into "objects" and then the actions or replacements are performed like methods on those objects.
+* has an oop scripting language
+
+If you like, you can think of rag pr as a modernized version of awk.
+
+Well, in fact first i had the idea to the pattern replacer and while working on it i found that it slightly reminded me of AWK - which is one of my favourite command line tools.
+

WikiPage Home modified by Axel Gehlert

Axel Gehlert — Tue, 27 Sep 2011 18:07:32 -0000

Welcome to your wiki! This is the default page, edit it as you see fit. To add a page simply reference it within brackets, e.g.: [SamplePage]. The wiki uses [Markdown](/p/ragpr/home/markdown_syntax/) syntax.