This is an interpreter and compiler (to javascript) for the Scheme language, which I must admit I know very little about. The plan is to create a number of components which operate on highland streams, and can be composed together create a compiler or interpreter that works in both the browser and on a server with node.js. See the following diagram:
+---------+ +-------------+
| Browser |>-+ +-->| Interpreter |
+---------+ \ / +-------------+
\ +-----------+ /
+->| Tokenizer |>-+
/ +-----------+ \
+--------+ / \ +----------+
| Server |>-+ +-->| Compiler |>--> Compiled Javascript
+--------+ +----------+
For the server, a file stream created with fs.createReadStream() forms the
input stream. In the browser, a component will generate a readable stream from
a given text input or whatever. For both the server and the browser, there will
also be a REPL.
The input stream is piped through the tokenizer and then into either the interpreter, which executes the Scheme program as it streams through, or into the compiler, which generates a stream of javascript to write to a compiled file.