Joypy

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• Thun
• Joypy

Better definition for enstacken.

Minor cleanup.

Minor cleanup.

Rearrange parser code.

It fits on a page now and reads well top-to-bottom.

Fold in expect-right-bracket-lookahead

Remake C version.

Remove underscores from example names.

Just for visual effect in the doc.

Parse errors.

Convert error to abort to get the messages picked up by the exception
handler.

Runtime type checking for bool.

I think I'm going to retire bool in favor of e.g. 0= and null.
Booleans are already Boolean, of course, and symbols should not be
expected to have a valid interpretation in a Boolean context (I think?)

Runtime type checking for rest of core; inscribe.

joy-dup

Runtime type checking for comparison ops.

Because we're using Scheme Booleans for Thun Booleans there's no need to
make a special function for these, we can reuse the one for math ops.

Runtime type checking for math ops.

joy-first

pop-any and pop-list.

Runtime type-checking.

minor edits

A little BTree.

Persistent (immutable) datastructure.

A start on error reporting.

I outfitted `rest` with some error reporting and tried out exception
handling. So far so good.

One issue is that the dictionary is not a persistent datastructure, so
if there was an "inscribe" command (it's not yet implemented for this
Scheme implementation) that might be slightly problematical. (If an
error were to occur in an evaluation that had already entered new
definitions into the dict then those definitions would "survive" into
the rest of the REPL session (or whatever.))

I'll look into persistent dict for Scheme.

Use Scheme symbols for Thun symbols.

It seems more elegant that way, but I haven't tested it to find out if
it has better performance or memory usage (yet.)

Symbols for symbols.

This shouldn't work yet, because the parser makes Lisp symbols out of
the Thun symbols, but the match expr still has strings. In the REPL
this fails, but in the compiled Joy binary it doesn't fail, the
interpreter interprets just fine.

add defs for select and small; cleaner joy-func.

A little more match.

Use match a little more.

Use match instead of cond.

Minor indentation change, a typo.

Remove global stack, dict.

Pass them through the recursive loop instead.

Put a bang on add-def.

Some edits.

min and max

Some edits to some notebooks.