This needs to run in the browser too, where we have no control over stack
limits.
* build-aux/bootstrap/birth.scm
(lex): Non-recursive strategy (loop with mutable list).
(make-token): Update doc. Produce list of token, new string, and
position. Don't recurse.
(body->es): Add `ret' param. Only produce `return' statement if new param
is set.
(cdfn): Use it.
(fnmap)
[js:while, js:break]: Add forms.
[lambda, let, case]: Use new `body->es' `ret' param.
[let*]: Define JS variables in output using `let' instead of `const' to
permit mutating with new `set!' form. Use new `body->es' `ret' param.
[set!]: Add form.
(prebirth->ecmascript): Adjust libprebirth path to be relative to self.
* build-aux/bootstrap/libprebirth.js
($$append$b$): Add `append!' procedure.
($$js$regexp, $$js$match, $$js$replace): Move a few lines up.
(fs): Provide stub if `require' is not defined.
* build-aux/bootstrap/prebirth.js
(_lex): Non-recursive strategy (loop with array-appending).
(_token): No more mutual recursion with `#_lex'. Return new string
and position.
(_bodyToEs): Add `ret' param. Only produce `return' statement if new
param is set.
(fnmap) [js:while, js:break]: Add forms.
[let*]: Define JS variables in output using `let' instead of `const' to
permit mutating with new `set!' form. Use new `body->es' `ret' param.
[set!]: Add form.
This completes bootstrapping for Prebirth Lisp. The next step will be
Rebirth, which will replace libprebirth.js, removing hand-written JavaScript
entirely.
Just about ready for that sloppy code generation!
* build-aux/bootstrap/birth.scm: Update file header documentation.
Add some whitespace between existing procedures.
Invoke `parse-lisp' as the program in place of `lex', producing an AST as
output to the console.
(cadddr): Add procedure.
(token-{type,lexeme,value,pos}): Add procedures.
(parse-lisp): Add procedure (contains other procedures).
* build-aux/bootstrap/libprebirth.js
($$append): Add function (append).
($$$_$): Correct implementation (-).
($$zero$7$): Add predicate (zero?).
($$fold): Add function (fold).
* build-aux/bootstrap/prebirth.js (parseLisp): Lowercase some errors.
(Compiler): Update class docblock.
(fnmap)[labmda]: Add `lambda' form.
This was implicit in the `define-block' implementation because of the
conversion from `<foo>' to `$foo$', but that's no longer the case.
This is just a simple, temporary implementation, so don't be alarmed.
* build-aux/bootstrap/libprebirth.js: Updated header documentation to
mention `$$' prefix.
($$js$console): Renamed from `js$console'.
* build-aux/bootstrap/prebirth.js
(_idFromName): Add `global' parameter to add `$$' prefix to generated
identifiers.
(_cdfn, _sexpToEs): Use it.
Mike Gerwitz