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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 -p 2140
cd 2140

Make sure you download the following two files:

  1. Main.java
  2. 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​

  1. Create a "JLex" directory (case sensitive!):
mkdir -p JLex
  1. Move "Main.java" (attached) into the JLex directory
 mv Main.java JLex
  1. cd into the JLex directory
cd JLex
  1. Compile "Main.java"
javac Main.java
  1. Move back to the parent directory
cd ..
  1. 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
  1. 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
  1. 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 -p 2140
cd 2140

wget http://jlu.myweb.cs.uwindsor.ca/214/Main.java
wget http://jlu.myweb.cs.uwindsor.ca/214/simple.lex

mkdir -p JLex
mv Main.java JLex
cd JLex
javac Main.java
cd ..

java JLex.Main simple.lex
javac simple.lex.java
java MyLexer