birth,prebirth: Non-recursive lexing to prevent stack exhaustion
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.
master
parent
35fa13a8a0
commit
431b18e1df
GPG Key ID:
8C917B7F5DC51BA2
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@ -69,54 +69,75 @@
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;; This is the lexer. Whitespace is ignored. The grammar consists of
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;; simple s-expressions.
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;;
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;; This procedure is mutually recursive with `token'. It expects that
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;; the source SRC will be left-truncated as input is processed. POS exists
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;; for producing metadata for error reporting---it has no impact on parsing.
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;; Tokens are produced with `make-token'. The source SRC will be
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;; left-truncated as input is processed. POS exists for producing metadata
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;; for error reporting---it has no impact on parsing.
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;;
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;; This implementation was originally recursive and immutable, but the stack
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;; was being exhausted, so it was refactored into an inferior
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;; implementation. Note the use of `js:while' and `js:break'---these are
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;; quick fixes to the problem of stack exhaustion in browsers (where we have
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;; no control over the stack limit); proper tail call support will come
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;; later when we have a decent architecture in place.
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;;
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;; The result is a list of tokens. See `token' for the format.
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(define (lex src pos)
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(let* ((ws (or (js:match-regexp "^\\s+"
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src)
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(list "")))
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(ws-len (string-length (car ws)))
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(trim (substring src ws-len)) ; ignore whitespace, if any
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(newpos (+ pos ws-len))) ; adj pos to account for removed ws
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(let ((toks (list)))
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(js:while #t ; browser stack workaround
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(let* ((ws (or (js:match-regexp "^\\s+"
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src)
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(list "")))
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(ws-len (string-length (car ws)))
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(trim (substring src ws-len)) ; ignore whitespace, if any
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(newpos (+ pos ws-len))) ; adj pos to account for removed ws
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(if (string=? "" trim)
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(list) ; EOF and we're done
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(if (string=? "" trim)
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(js:break) ; EOF and we're done
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;; normally we'd use `string-ref' here, but then we'd have to
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;; implement Scheme characters, so let's keep this simple and keep
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;; with strings
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(let ((ch (substring trim 0 1)))
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(case ch
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;; comments extend until the end of the line
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((";") (let ((eol (js:match-regexp "^(.*?)(\\n|$)" trim)))
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(make-token "comment" (cadr eol) trim newpos)))
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;; normally we'd use `string-ref' here, but then we'd have to
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;; implement Scheme characters, so let's keep this simple and keep
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;; with strings
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(let* ((ch (substring trim 0 1))
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(t (case ch
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;; comments extend until the end of the line
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((";") (let ((eol (js:match-regexp "^(.*?)(\\n|$)" trim)))
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(make-token "comment" (cadr eol) trim newpos)))
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;; left and right parenthesis are handled in the same manner:
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;; they produce distinct tokens with single-character lexemes
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(("(") (make-token "open" ch trim newpos))
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((")") (make-token "close" ch trim newpos))
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;; left and right parenthesis are handled in the same
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;; manner: they produce distinct tokens with
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;; single-character lexemes
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(("(") (make-token "open" ch trim newpos))
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((")") (make-token "close" ch trim newpos))
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;; strings are delimited by opening and closing ASCII double
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;; quotes, which can be escaped with a backslash
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(("\"") (let ((str (js:match-regexp "^\"(|.*?[^\\\\])\""
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trim)))
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(or str (parse-error
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src pos "missing closing string delimiter"))
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;; a string token consists of the entire string
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;; including quotes as its lexeme, but its value will
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;; be the value of the string without quotes due to
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;; the `str' match group (see `token')
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(make-token "string" str trim newpos)))
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;; strings are delimited by opening and closing ASCII
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;; double quotes, which can be escaped with a
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;; backslash
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(("\"") (let ((str (js:match-regexp "^\"(|.*?[^\\\\])\""
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trim)))
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(or str (parse-error
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src pos
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"missing closing string delimiter"))
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;; a string token consists of the entire
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;; string including quotes as its lexeme,
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;; but its value will be the value of the
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;; string without quotes due to the `str'
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;; match group (see `token')
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(make-token "string" str trim newpos)))
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(else
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;; anything else is considered a symbol up until whitespace or
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;; any of the aforementioned delimiters
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(let ((symbol (js:match-regexp "^[^\\s()\"]+"
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trim)))
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(make-token "symbol" symbol trim newpos))))))))
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(else
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;; anything else is considered a symbol up until
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;; whitespace or any of the aforementioned
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;; delimiters
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(let ((symbol (js:match-regexp "^[^\\s()\"]+"
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trim)))
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(make-token "symbol" symbol trim newpos))))))
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;; yikes---see notes in docblock with regards to why
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;; we're using mutators here
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(set! toks (append toks (list (car t))))
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(set! src (cadr t))
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(set! pos (caddr t))))))
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toks))
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@ -132,14 +153,7 @@
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;; Produce a token and recurse.
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;;
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;; The token will be concatenated with the result of the mutually
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;; recursive procedure `lex'.
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;;
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;; For the record: I'm not fond of mutual recursion from a clarity
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;; standpoint, but this is how the abstraction evolved to de-duplicate
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;; code, and I don't much feel like refactoring it.
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;; Produce a token, left-truncate src, and update pos.
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;;
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;; Unlike the JS Prebirth implementation which uses a key/value object,
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;; we're just using a simple list.
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@ -160,9 +174,9 @@
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;; produce token and recurse on `lex', left-truncating the source
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;; string to discard what we have already processed
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(cons (list (quote token) type lexeme value pos)
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(lex (substring src len)
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(+ pos len)))))
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(list (list (quote token) type lexeme value pos)
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(substring src len)
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(+ pos len))))
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;; various accessor procedures for token lists (we're Prebirth Lisp here,
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@ -309,21 +323,21 @@
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;;
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;; This produces a 1:1 mapping of body XS s-expressions to ES statements,
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;; recursively. The heavy lifting is done by `sexp->es'.
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(define (body->es xs)
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(define (body->es xs ret)
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;; recursively process body XS until we're out of pairs
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(if (not (pair? xs))
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""
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(let* ((x (car xs))
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(rest (cdr xs))
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(more? (pair? rest)))
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(more? (or (not ret) (pair? rest))))
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;; the result is a semicolon-delimited string of statements, with
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;; the final statement prefixed with `return'
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;; the final statement prefixed with `return' unless (not ret)
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(string-append
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" "
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(if more? "" "return ") ; prefix with `return' if last body exp
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(sexp->es x) ";" ; process current body expression
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(if more? "\n" "")
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(body->es rest))))) ; recurse
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(if more? "" "return ") ; prefix with `return' if last body exp
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(sexp->es x) ";" ; process current body expression
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(if (pair? rest) "\n" "")
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(body->es rest ret))))) ; recurse
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;; Compile procedure definition into an ES function definition
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@ -334,7 +348,7 @@
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(let* ((dfn (cadr t))
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(id (tname->id (token-value (car dfn))))
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(params (params->es (cdr dfn)))
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(body (body->es (cddr t))))
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(body (body->es (cddr t) #t)))
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;; this is the final format---each procedure becomes its own function
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;; definition in ES
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(string-append
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@ -363,6 +377,19 @@
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(("js:console")
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(string-append "console.log(" (map sexp->es args) ")"))
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;; yes, there are more important things to do until we get to the
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;; point where it's worth implementing proper tail calls
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(("js:while")
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(let ((pred (car args))
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(body (cdr args)))
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(string-append
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"(function(__whilebrk){"
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"while (" (sexp->es pred) "){\n"
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(body->es body #f) " if (__whilebrk) break;\n"
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"}\n"
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"})(false)")))
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(("js:break") "__whilebrk=true")
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;; fortunately ES6+ has native symbol support :)
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;; we don't (yet?) need list quoting in Prebirth
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(("quote")
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@ -377,7 +404,7 @@
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(body (cdr args)))
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(string-append
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"function(" (join ", " (map sexp->es fnargs)) "){\n"
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(body->es body)
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(body->es body #t)
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"}")))
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;; simple if statement with optional else, wrapped in a self-executing
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@ -430,10 +457,10 @@
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(join "" (map (lambda (binding)
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(let ((var (car binding))
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(init (cadr binding)))
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(string-append " const " (sexp->es var)
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(string-append " let " (sexp->es var)
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" = " (sexp->es init) ";\n")))
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bindings))
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(body->es body) "\n"
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(body->es body #t) "\n"
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" })()")))
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;; similar to the above, but variables cannot reference one-another
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@ -445,7 +472,7 @@
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(fargs (join ", " (map sexp->es
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(map cadr bindings)))))
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(string-append "(function(" fparams "){\n"
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(body->es body) "\n"
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(body->es body #t) "\n"
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"})(" fargs ")")))
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;; and here I thought Prebirth Lisp would be simple...but having
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@ -469,11 +496,16 @@
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(string-append
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"case " (sexp->es datum) ":\n"))
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data)))
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(body->es exprs) "\n"))
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(body->es exprs #t) "\n"))
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(map car clauses)
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(map cdr clauses)))
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"}})()")))
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(("set!")
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(let ((varid (car args))
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(val (cadr args)))
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(string-append (sexp->es varid) " = " (sexp->es val))))
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;; normal procedure application
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(else (let* ((idfn (tname->id fn))
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(argstr (join ", " (map sexp->es args))))
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@ -516,7 +548,7 @@
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;; output libprebirth and compiled output, wrapped in a self-executing
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;; function to limit scope
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(string-append "(function(){"
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(js:file->string "build-aux/bootstrap/libprebirth.js") "\n\n"
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(js:file->string "libprebirth.js") "\n\n"
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(join "\n\n" (map sexp->es ast))
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"})();"))
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@ -83,6 +83,11 @@ const $$cons = ( item, list ) => _assertList( list ) && [ item ].concat( list )
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const $$car = xs => _assertPair( xs ) && xs[ 0 ];
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const $$cdr = xs => _assertPair( xs ) && xs.slice( 1 );
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// warning: this should technically set the cdr to the next element, and
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// should accept any number of arguments, but that's not what we're doing
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// here (note that an empty list is not a pair and therefore has no cdr)
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const $$append$b$ = ( dest, xs ) => ( dest.length === 0 ) ? [] : dest.push( xs );
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// warning: blows up if any items are non-lists, whereas the proper RnRS
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// implementation will set the cdr to the final item even if it's not a pair
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function $$append()
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@ -134,16 +139,18 @@ const $$map = ( f, ...xs ) =>
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xs.map( x => x[ i ] ) ) );
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// Node.js stuff
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const fs = require( 'fs' );
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// stdin->string
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const $$js$file$_$$g$string = ( path ) =>
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fs.readFileSync( path ).toString();
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const $$js$regexp = ( s, opts ) => new RegExp( s, opts );
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const $$js$match = ( r, s ) => s.match( r ) || false;
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const $$js$replace = ( r, repl, s ) => s.replace( r, repl );
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const fs = ( typeof require !== 'undefined' )
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? require( 'fs' )
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: { readFileSync: path => window.fsdata[ path ] };
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// stdin->string
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const $$js$file$_$$g$string = ( path ) =>
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fs.readFileSync( path ).toString();
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/** =============== end of libprebirth =============== **/
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@ -177,10 +177,13 @@ class Parser
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* This is the lexer. Whitespace is ignored. The grammar consists of
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* simple s-expressions.
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*
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* This function is mutually recursive with `#_token'. It expects that
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* the source SRC will be left-truncated as input is
|
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* processed. POS exists for producing metadata for error
|
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* reporting---it has no impact on parsing.
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* Tokens are produced with `#_token'. The source SRC will be
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* left-truncated as input is processed. POS exists for producing
|
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* metadata for error reporting---it has no impact on parsing.
|
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*
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* This implementation was originally recursive and immutable, but the
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* stack was being exhausted, so it was refactored into an inferior
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* implementation.
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*
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* @param {string} src source code
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* @param {number} pos position (character offset) in source
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@ -189,63 +192,74 @@ class Parser
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*/
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_lex( src, pos = 0 )
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{
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// ignore whitespace, if any
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const ws = src.match( /^\s+/ ) || [ "" ];
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const trim = src.substr( ws[ 0 ].length );
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const toks = [];
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// adjust position to account for any removed whitespace
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pos += ws[ 0 ].length;
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// process until EOF (see break)
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while ( true ) {
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// ignore whitespace, if any
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const ws = src.match( /^\s+/ ) || [ "" ];
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const trim = src.substr( ws[ 0 ].length );
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// EOF and we're done
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if ( trim === '' ) {
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return [];
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}
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// adjust position to account for any removed whitespace
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pos += ws[ 0 ].length;
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// comment until end of line
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if ( trim[ 0 ] === ';' ) {
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const eol = trim.match( /^(.*?)(\n|$)/ );
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return this._token( 'comment', eol[ 1 ], trim, pos );
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}
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// left and right parenthesis are handled in the same manner: they
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// produce distinct tokens with single-character lexemes
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if ( trim[ 0 ] === '(' ) {
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return this._token( 'open', '(', trim, pos );
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}
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if ( trim[ 0 ] === ')' ) {
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return this._token( 'close', ')', trim, pos );
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}
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// strings are delimited by opening and closing ASCII double quotes,
|
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// which can be escaped with a backslash
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if ( trim[ 0 ] === '"' ) {
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const str = trim.match( /^"(|.*?[^\\])"/ );
|
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if ( !str ) {
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this._error( src, pos, "missing closing string delimiter" );
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// EOF and we're done
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if ( trim === '' ) {
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break;
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}
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// a string token consists of the entire string including quotes
|
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// as its lexeme, but its value will be the value of the string
|
||||
// without quotes due to the `str' match group (see `#_token')
|
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return this._token( 'string', str, trim, pos );
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let t = null;
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// comment until end of line
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if ( trim[ 0 ] === ';' ) {
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const eol = trim.match( /^(.*?)(\n|$)/ );
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t = this._token( 'comment', eol[ 1 ], trim, pos );
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}
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// left and right parenthesis are handled in the same manner: they
|
||||
// produce distinct tokens with single-character lexemes
|
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else if ( trim[ 0 ] === '(' ) {
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t = this._token( 'open', '(', trim, pos );
|
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}
|
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else if ( trim[ 0 ] === ')' ) {
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t = this._token( 'close', ')', trim, pos );
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}
|
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// strings are delimited by opening and closing ASCII double quotes,
|
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// which can be escaped with a backslash
|
||||
else if ( trim[ 0 ] === '"' ) {
|
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const str = trim.match( /^"(|.*?[^\\])"/ );
|
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if ( !str ) {
|
||||
this._error( src, pos, "missing closing string delimiter" );
|
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}
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||||
|
||||
// a string token consists of the entire string including quotes
|
||||
// as its lexeme, but its value will be the value of the string
|
||||
// without quotes due to the `str' match group (see `#_token')
|
||||
t = this._token( 'string', str, trim, pos );
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}
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// anything else is considered a symbol up until whitespace or any
|
||||
// of the aforementioned delimiters
|
||||
else {
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const symbol = trim.match( /^[^\s()"]+/ );
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t = this._token( 'symbol', symbol, trim, pos );
|
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}
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const [ tok, newsrc, newpos ] = t;
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// add token, left-truncate src, update pos
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toks.push( tok );
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||||
src = newsrc;
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pos = newpos;
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}
|
||||
|
||||
// anything else is considered a symbol up until whitespace or any
|
||||
// of the aforementioned delimiters
|
||||
const symbol = trim.match( /^[^\s()"]+/ );
|
||||
return this._token( 'symbol', symbol, trim, pos );
|
||||
return toks;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Produce a token and recurse
|
||||
*
|
||||
* The token will be concatenated with the result of the mutually
|
||||
* recursive method `_lex'.
|
||||
*
|
||||
* For the record: I'm not fond of mutual recursion from a clarity
|
||||
* standpoint, but this is how the abstraction evolved to de-duplicate
|
||||
* code, and I don't much feel like refactoring it.
|
||||
* Produce a token, left-truncate src, and update pos
|
||||
*
|
||||
* @param {string} type token type
|
||||
* @param {string|Array} match lexeme match
|
||||
|
|
@ -272,14 +286,13 @@ class Parser
|
|||
pos: pos
|
||||
};
|
||||
|
||||
// continue producing tokens by recursing, left-truncating the
|
||||
// source string to discard what we have already processed
|
||||
return [ token ].concat(
|
||||
this._lex(
|
||||
src.substr( lexeme.length ),
|
||||
( pos + lexeme.length )
|
||||
)
|
||||
);
|
||||
// produce token, left-truncating the source string to discard what
|
||||
// we have already processed
|
||||
return [
|
||||
token,
|
||||
src.substr( lexeme.length ),
|
||||
( pos + lexeme.length ),
|
||||
];
|
||||
}
|
||||
};
|
||||
|
||||
|
|
@ -431,7 +444,7 @@ class Compiler
|
|||
*
|
||||
* @return {string} compiled BODY
|
||||
*/
|
||||
_bodyToEs( body )
|
||||
_bodyToEs( body, ret = true )
|
||||
{
|
||||
// the body must be an array of expressions (this should always be
|
||||
// the case unless we have a bug in the compiler)
|
||||
|
|
@ -447,8 +460,8 @@ class Compiler
|
|||
// the final expression
|
||||
return js.map( ( s, i ) =>
|
||||
{
|
||||
const ret = ( i === ( js.length - 1 ) ) ? "return " : "";
|
||||
return ` ${ret}${s};`;
|
||||
const retstmt = ( ret && i === ( js.length - 1 ) ) ? "return " : "";
|
||||
return ` ${retstmt}${s};`;
|
||||
} ).join( '\n' );
|
||||
}
|
||||
|
||||
|
|
@ -543,6 +556,16 @@ class Compiler
|
|||
const fnmap = {
|
||||
'js:console': 'console.log',
|
||||
|
||||
// yes, there are more important things to do until we get to the point
|
||||
// where it's worth implementing proper tail calls
|
||||
'js:while': ( [ pred, ...body ], stoes, btoes ) =>
|
||||
"(function(__whilebrk){" +
|
||||
`while (${stoes(pred)}){\n` +
|
||||
`${btoes(body, false)} if (__whilebrk) break;\n` +
|
||||
"}\n" +
|
||||
"})(false)",
|
||||
'js:break': () => '__whilebrk=true',
|
||||
|
||||
// fortunately ES6+ has native symbol support :)
|
||||
// we don't (yet?) need list quoting in Prebirth
|
||||
'quote': ( x, stoes ) => Array.isArray( x.value )
|
||||
|
|
@ -590,7 +613,7 @@ const fnmap = {
|
|||
'let*': ( [ bindings, ...body ], stoes, btoes ) =>
|
||||
"(function(){\n" +
|
||||
bindings
|
||||
.map( ([ x, val ]) => ` const ${stoes(x)} = ${stoes(val)};\n` )
|
||||
.map( ([ x, val ]) => ` let ${stoes(x)} = ${stoes(val)};\n` )
|
||||
.join( '' ) +
|
||||
btoes( body ) + "\n" +
|
||||
" })()",
|
||||
|
|
@ -624,7 +647,11 @@ const fnmap = {
|
|||
btoes( exprs ) + "\n"
|
||||
).join( '' ) +
|
||||
"}" +
|
||||
"})()"
|
||||
"})()",
|
||||
|
||||
// basic mutator (variable assignment)
|
||||
'set!': ( [ varid, val ], stoes ) =>
|
||||
`${stoes(varid)} = ${stoes(val)}`,
|
||||
};
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue