haScm

haScm is an Interpreter of Scheme written in Haskell.

The Implementation mainly (but loosely) follows "Revised5 Report on the Algorithmic Language Scheme".

Settings

• It loads <home>/.hascmrc when REPL starts.
• lib/core.scm and lib/lib.scm includes functions provided r5rs.

Important difference

• List is immutable(deriving Haskell) .
  • So set-car! and set-cdr! is limited.
  • So eq?, eqv?, set! has its own semantics.
• Macro is classic (like Common Lips's one).

Built-in Module System

• (module <definition> ... (export <symbol> ...))
  • A buit-in macro.
  • Write definitions and export some of them.
  • It is a list of pairs of name and value, actually.
• (require '<symbol>)
  • Search directories in 'path and load a file found.
• (import <module>)
  • define the exported definitons in the current environment.