jere-mie/JLex-Install.md

## JLex-Install.md

      
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              JLex-Install.md
            
          
    Instructions to Install JLex on the CS Servers

Want all the instructions in one code block without the explanations? Check out the appendix.
Before Starting

You may want to create a separate "2140" directory for this class:
mkdir 2140
cd 2140
Make sure you download the following two files:

Main.java
simple.lex

You can download files on the CS servers by running wget url, where url is replaced with the url of the file you want to download.

So, to download these two files, you can run:
wget http://jlu.myweb.cs.uwindsor.ca/214/Main.java
wget http://jlu.myweb.cs.uwindsor.ca/214/simple.lex
Instructions


Create a "JLex" directory (case sensitive!):

mkdir JLex

Move "Main.java" (attached) into the JLex directory

 mv Main.java JLex

cd into the JLex directory

cd JLex

Compile "Main.java"

javac Main.java

Move back to the parent directory

cd ..

JLex is now installed! You can now run the scanner generator.

The general method to do this is to run: java JLex.Main lexFileName, replacing lexFileName with the name of your lex file.

We'll use the sample lex file simple.lex, courtesy of Dr. Jianguo Lu, which we downloaded earlier.

To run this file, simply type:

java JLex.Main simple.lex

You should now see a new file generated, called lexFileName.java, or in this case simple.lex.java. We must now compile it, by typing:

javac simple.lex.java

A new file, MyLexer.class should have been created (note, if using a lex file other than simple.lex, this file may be named something different). We can now run the lexer by running:

java MyLexer
That's it!

Now try typing stuff on your keyboard and see how the lexer responds. Try typing "int" or typing some words, like "hello" and "world".
Appendix

All the commands in one block

mkdir 2140
cd 2140
wget http://jlu.myweb.cs.uwindsor.ca/214/Main.java
wget http://jlu.myweb.cs.uwindsor.ca/214/simple.lex
mkdir JLex
mv Main.java JLex
cd JLex
javac Main.java
cd ..
java JLex.Main simple.lex
javac simple.lex.java
java MyLexer