I've been torn on this for a bit, but we're using "es" (ECMAScript) in a lot
of important places. Thinks like "js:console" I was considering leaving
because "console" is not an ECMAScript thing---it is JavaScript. But now we
will take "es:" to mean "outputting in ECMAScript".
* build-aux/bootstrap/birth.scm, build-aux/bootstrap/rebirth.scm,
build-aux/bootstrap/prebirth.js:
s/js:/es:/g.
* build-aux/bootstrap/libprebirth.js: s/\$\$js\$/\$\$es\$/g.
This allows bootstrapping in either a development environment (Node.js) or
simply using the intended runtime environment: the user's browser.
* bootstrap.html: Add file (browser).
* bootstrap.js: Add file (command-line).
* bootstrap/Bootstrap.js: Add class. Formalize bootstrap process.
* bootstrap/libprebirth.js
(fsdata): Add variable to serve as filesystem stub.
(fs): Always throw error when `fs' module is unavailable.
($$js$file$_$$g$string): Consider `fsdata'.
* bootstrap/prebirth.js: Export as CommonJS module if in proper
environment. Abort automatic processing via stdin if root CommonJS
module.
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