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(define-module (language python python)
#:use-module (language python parser)
#:use-module (language python expr)
#:use-module (ice-9 match)
#:export (compile-python-string compile-python-file))
;;; VARIABLES ----------------------------------------------------------------
(define (find-global-variables vars tree)
(define (for-each* f l)
(match l
((x . l)
(f x)
(for-each* f l))
(x
(f x))))
(define (local tree)
(match tree
((#:global l)
(for-each*
(lambda (x) (hash-set! vars x #t)) l))
((x . l)
(for-each* local tree))
(_
#t)))
(define (collect tree)
(match tree
((#:lambdef . _)
#t)
((#:identifier . l)
(hash-set! vars tree #t))
((_ . _)
(for-each* collect tree))
(_
#t)))
(let lp ((tree tree))
(match tree
((#:def . l)
(for-each* local l))
((#:lambdef . l)
(for-each* local l))
((#:class . l)
(for-each* local l))
((#:expr-stmt
a (#:assign x ... e))
(collect a)
(collect x))
((x . l)
(for-each* lp tree))
(_
#t))))
;; COMPILATION
(define (expr stx out tree)
(define (expr-lhs tree)
(match tree
((#:test (#:power (#:identifier v . _)))
(datum->syntax stx (string->symbol v)))))
(define (expr-rhs tree)
(define (comp-tr op)
(match op
("notin" #'py-notin)
("isnot" #'py-isnot)
("==" #'py_==)
(">=" #'py_>=)
("<=" #'py_<=)
("<>" #'py_<>)
("!=" #'py_!=)
("in" #'py_in)
("is" #'py_is)
("<" #'py_< )
(">" #'py_> )))
(let lp ((tree tree))
(match tree
((#:test x #f)
(lp x))
((#:test x (a b))
#`(if #,(py-true? (lp a)) #,(lp x) #,(lp b)))
((#:or x . y)
#`(py-or #,(lp x) #,@(map lp y)))
((#:and x y)
#`(py-and #,(lp x) #,@(map lp y)))
((#:not x)
#`(py-not #,(lp x)))
((#:comp x)
(lp x))
((#:comp x (op . y) . l)
#'(#,(comp-tr op) #,(lp x) #,(lp (cons* #:comp y l))))
((#:bor x y)
#`(py-bor #,(lp x) #,@(map lp y)))
((#:bxor x y)
#`(py-bxor #,(lp x) #,@(map lp y)))
((#:xand x y)
#`(py-band #,(lp x) #,@(map lp y)))
((#:<< x y)
#`(py-<< #,(lp x) #,@(map lp y)))
((#:>> x y)
#`(py->> #,(lp x) #,@(map lp y)))
((#:+ x y)
#`(py-+ #,(lp x) #,@(map lp y)))
((#:- x y)
#`(py-- #,(lp x) #,@(map lp y)))
((#:* x y)
#`(py-* #,(lp x) #,@(map lp y)))
((#:/ x y)
#`(py-/ #,(lp x) #,@(map lp y)))
((#:// x y)
#`(py-// #,(lp x) #,@(map lp y)))
((#:% x y)
#`(py-% #,(lp x) #,@(map lp y)))
((#:u+ x)
#`(py-u+ #,(lp x)))
((#:u- x)
#`(py-u- #,(lp x)))
((#:u~ x)
#`(py-u~ #,(lp x)))
((#:power x trailer . #f)
(compile-trailer trailer (lp x)))
((#:power x trailer . l)
#'(py-power ,#(compile-trailer trailer (lp x)) #,(lp l)))
((#:identifier x . _)
(datum->syntax stx (string->symbol x)))
((not (_ . _))
tree))))
(lambda (tree)
(match tree
((test1 (#:assign))
(expr-rhs test1))
((test1 (#:assign tests ... last))
(with-syntax (((rhs ...) (map expr-rhs last))
((lhs1 ...) (map expr-lhs test1))
(((lhs ...) ...) (reverse (map (lambda (l)
(map expr-lhs l))
tests))))
(with-syntax (((v ...) (generate-temporaries #'(lhs1 ...))))
(out #'(call-with-values (lambda () (values rhs ...))
(lambda (v ...)
(begin
(set! lhs v) ...)
...
(set! lhs1 v) ...)))))))))
(define (compile-outer state out tree)
(define (compile-stmt state tree)
(match tree
((#:expr-stmt l)
(compile-expr l))
((#:del l)
(compile-del l))
(#:pass
(out #'(if #f #f)))
(#:break
(break out))
(#:continue
(continue out))
((#:return . l)
(compile-return state l))
((#:raise . l)
(compile-raise state l))
((#:import l)
(compile-import state l))
((#:global . _)
#t)
((#:nonlocal . _)
#t)
((#:assert . l)
(compile-assert state l))))
(match tree
((#:stmt x)
(for-each* compile-stmt tree))
((#:if . l)
(compile-if state l))
((#:while . l)
(compile-while state l))
((#:for . l)
(compile-for state l))
((#:try . l)
(compile-try state l))
((#:with . l)
(compile-with state l))
((#:def . l)
(compile-def state l))
((#:decorated . l)
(compile-decorated state l))))
(define (compile-python0 stx tree output)
(define global-variables (make-hash-table))
(find-global-variables global-variables tree)
(set! all-variables
(hash-fold
(lambda (k v e)
(match k
((_ v . _)
(cons (datum->syntax stx (string->symbol v)) e))))
'() global-variables))
(set! all-globals
(hash-fold
(lambda (k v e)
(match k
((_ v)
(cons (datum->syntax stx (string->symbol v)) e))))
'() global-variables))
(output (with-syntax (((v ...) all-variables))
#'(begin (define v (if #f #f)) ...)))
(output (with-syntax (((v ...) all-globals))
#'(export v ...)))
(output #`(begin #,@(compile-outer))))
(define (compile-python1 stx tree)
(let ((out '()))
(define (out x) (set! out (cons x out)))
(compile-python0 stx tree out)
(cons* #'begin (reverse out))))
(define-syntax compile-python-string
(lambda (x)
(syntax-case x ()
((_ y)
(if (string? (syntax->datum #'y))
(compile-python1 x (python-parser (syntax->datum #'y))))))))
(define-syntax compile-python-file
(lambda (x)
(syntax-case x ()
((_ y)
(if (string? (syntax->datum #'y))
(with-input-from-file (syntax->datum #'y)
(lambda () (compile-python1 x (python-parser))))
#f)))))
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