https://github.com/NicholasLYang/for-the-graal

A simple but absurd language implemented in Ruby-Java-JavaScript
https://github.com/NicholasLYang/for-the-graal

Last synced: about 1 month ago
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A simple but absurd language implemented in Ruby-Java-JavaScript

• Host: GitHub
• URL: https://github.com/NicholasLYang/for-the-graal
• Owner: NicholasLYang
• Created: 2021-04-16T23:03:31.000Z (over 3 years ago)
• Default Branch: master
• Last Pushed: 2021-04-17T05:54:18.000Z (over 3 years ago)
• Last Synced: 2024-08-04T08:02:40.402Z (5 months ago)
• Language: Java
• Size: 21.5 KB
• Stars: 3
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# For The Graal

This is a fun absurd interpreter for a mini language.

The parser is implemented in Ruby using a s-expression parser SXP,

the type checker/compiler is written in Java and the interpreter in

JavaScript

## Language

A program consists of a list of statements. Currently, there are functions,

 if statements, let statements and print statements.

The language supports numbers (double precision floating point), strings and bools.

Functions are defined using `fun`. They take in a name, a list of params,

and a body. Params are a name/type pair. The function body is a list of

statements.

```

(

  (fun foo ((n number) (b number)) 

    (

      (print (* n b))

    )

  )

)

```

Let statements are defined using `let`. They take in a name and an expression.

```

(

  (let a (* 25 (/ 30 10)))

)

```

Print statements are defined using `print`. They take in a single expression.

```

(

  (print "foobar")

)

```

If statements are defined using `if`. They take in a condition, and 

a then block with an optional else block.

```

(

  (if (< 10 20) (print "10 < 20"))

  (if (< 21 20) (print "21 < 20") (print "21 > 20"))

)

```

## Running

Before running, you should have Graal with Ruby, JavaScript and Java

all installed. Also, please make sure to run `bundle install` 

to install `sxp`.

Compiling is simply:

```

javac -Xlint:unchecked -classpath src/ src/Main.java

```

and running:

```

java -classpath src/ Main 

```

Where `` is a file containing the source code. 

Check out `examples/` for, well, examples.

`javac` and `java` must be the Graal versions, of course.

NOTE: You must run the code from the root directory as it loads files

via relative paths.