Sergiu Ivanov

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~~TRANS~~

===== Course on formal languages: Parsing =====

I teach the part of this course related to the [[wp>Chomsky hierarchy]] and [[wp>parsing]].  The materials of this course are distributed under the [[https://en.wikipedia.org/wiki/Creative_Commons_license|Creative Commons Attribution Alone licence]] {{:ccby.png?60}}
.
==== Slides ====

The slides for my part of the course are available {{:parsing.pdf|here}} (in French).

==== Practical assignment ====

The exercises for the practical assignment (in French) can be downloaded {{:parsing-tp.pdf|here}}.
==== Source code ====

In this course I show a simple interpreter for a language of variable assignments.  The variables can either be strings or integer numbers.  A program in this language may look as follows:

<code>
String var1 = "hello world 1 + 2";
int var2 = 1 - (2 + 3);
int var3 = 4 + var2;
</code>

{{:parsing.zip|This}} archive contains the complete source code of the interpreter as well as several example programs.

To build the project, run the following commands:
<code bash>
jflex arith.flex
jacc arith.jacc
javac ArithEval.java
</code>

The following command runs just the scanner on the first example:
<code bash>
java Yylex examples/example1.duck
</code>

The following command runs the interpreter on the first example:
<code bash>
java ArithEval examples/example1.duck
</code>

==== Toolchain ====
The project relies on [[http://jflex.de/download.html|JFlex]] scanner generator and [[http://web.cecs.pdx.edu/~mpj/jacc/|Jacc]] parser generator.  Both tools generate Java code.  {{:parsing-workflow.pdf|Here}} is a short overview of a typical workflow.

This toolchain was suggested by [[http://lacl.univ-paris12.fr/gava/actuel.htm|Frédéric Gava]] (section Parsing de fichiers en Java).  This page also contains other slides about parsing.
Sergiu Ivanov

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