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54831a34fa
- add booleans, dotted lists, functions - proper lexical scope - special forms: define, set!, and, or, quote, lambda - added some basic list manipulations - print functions and dotted lists - removed nil - more robust in general
76 lines
No EOL
2 KiB
Markdown
76 lines
No EOL
2 KiB
Markdown
Lake Scheme
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===========
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A quick and dirty scheme written in C, for fun and to use while reading The Little Schemer. Very quick and dirty, a weekend hack gone awry.
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Compiling & Running
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===================
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Portable C99, only dep is glib, nothing to configure, no documentation!
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Install glib 2.x using your package manager, for me it's either `brew install glib` or `sudo aptitude install glib`. Once you have glib just run:
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$ make && ./lake
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That will drop you at a repl. There are booleans, symbols, integers, strings, lists, dotted lists (pairs), lambdas, and a few special forms.
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> #t
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#t
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> (quote symbol)
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symbol
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> 101
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101
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> "hello"
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"hello"
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> (quote (1 2 3 4))
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(1 2 3 4)
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> (quote (1 . 2))
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(1 . 2)
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> (lambda () "hello")
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(lambda () "hello")
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> (define inc (lambda (x) (+ x 1)))
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Hooray! It parses (reads), evaluates, and then prints things back. However there aren't any primitives yet, so no `+`, and if you try to *use* `inc` defined above it will not work. The special forms present so far are: `quote`, `define`, `set!`, `and`, `or`, and `lambda`.
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> (define answer 7)
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> answer
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7
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> (set! answer 42)
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> answer
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42
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> (define list (lambda rest rest))
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> (list 1 2 3 4)
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(1 2 3 4)
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Woah, we even managed to define a useful function without any primitives!
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Lake still needs:
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* primitives:
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* display values
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* compare values
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* basic control flow (if, cond, when)
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* native type operations:
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* symbol
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* integer (math)
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* boolean (logic)
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* string
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* function
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* list (cons, car, cdr, ...)
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* dotted list (head, tail)
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* a minimal stdlib
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* sugar such as '... -> (quote ...)
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I don't think I'll need any other numeric types. Similarly I don't intend to add features expected from real languages, such as exception handling, I/O, GC, etc.
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Contributors
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============
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None of them want any credit.
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License
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=======
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Copyright 2011 Sami Samhuri
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MIT License, see included [LICENSE](blob/master/LICENSE) file |