fixup! Start Pasers Combinators lesson

blackheaven · blackheaven · commit 221524902189 · 2021-12-17T14:31:27.000+01:00
diff --git a/Gemfile.lock b/Gemfile.lock
@@ -122,6 +122,7 @@ GEM
       execjs (>= 0.3.0, < 3)
 
 PLATFORMS
+  ruby
   x86_64-linux
 
 DEPENDENCIES
diff --git a/_data/contents.yml b/_data/contents.yml
@@ -11,11 +11,10 @@ basics:
   - pattern-matching
   - containers
 parsers:
-  - appar
-  - attoparsec
-  - index
   - introduction
-  - megaparsec
+  - readp
   - parsec
+  - megaparsec
+  - attoparsec
+  - appar
   - parsley
-  - readp
diff --git a/en/lessons/parsers/index.md b/en/lessons/parsers/index.md
diff --git a/en/lessons/parsers/introduction.md b/en/lessons/parsers/introduction.md
@@ -5,6 +5,8 @@ title: Introduction to Parser Combinators
 
 {% include toc.html %}
 
+Parsers are ubiquitous in Haskell litterature because, thanks to Parser Combinators it illustrates the power of composition.
+
 Parsers, while being mostly associated to compilers and interpreters, can be found everywhere.
 
 Their goal is to take a input data (usually a text or a stream), and produce a structured output (usually a data structure, such as an [AST](https://en.wikipedia.org/wiki/Abstract_syntax_tree)), see [this article](https://lexi-lambda.github.io/blog/2019/11/05/parse-don-t-validate/) for day to day application.
