Language_3 - A Language of Expressions with Lexically Scoped Variables

The packages {@link language3}, {@link treelanguage}, {@link tree}, and {@link tokenizer} define a language of arithmetic and boolean expressions that uses a Lisp like prefix notation.

The grammar for this language is in the file Language_3.txt

The file {@link Language_3_Examples} shows many examples of expressions in this language.

The file {@link Language_3} defines an interpreter for this language.

To build the interpreter, run (double-click)

   build_all_classes.cmd

then run

   build_jar_file.cmd

which builds an executable jar file for the interpreter program.

To run the interpreter jar file, on the command-line run

> Language_3.cmd

which runs the interpreter as a REPL (read eval print loop).

The files

script-1.Lan3
script-2.Lan3

are "script files" written in this language.

To run a script file using the interpreter, on the command-line run

> Language_3.cmd  script-1.Lan3
> Language_3.cmd  script-2.Lan3

You can use the Language_3.cmd shell script without having to open a command-line window. This makes it easy to run the interpreter's jar file. If you double click on Language_3.cmd (after having built the jar file), it will run the interpreter as a REPL. If you drag-and-drop one of the "language scripts," script-1.Lan3 or script-2.Lan3, onto Language_3.cmd, the shell script will execute the language script file using the interpreter's jar file.