/
lang.rkt
184 lines (169 loc) · 6.97 KB
/
lang.rkt
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#lang racket
(require "term.rkt" "rule.rkt"
(for-syntax racket/string racket/base syntax/parse syntax/parse/class/paren-shape))
(provide
(for-syntax atom constraint)
clingo-atom clingo-constraint clingo-rule)
(begin-for-syntax
(define (is-valid-symbol sym)
(define str (symbol->string sym))
(regexp-match "[a-z][A-Za-z0-9_-]*" str))
(define (char-upcase? c) (equal? c (char-upcase c)))
(define (is-variable sym)
(define str (symbol->string sym))
(char-upcase? (string-ref str 0)))
(define (make-variable stx)
(define sym (syntax-e stx))
(define str (symbol->string sym))
(define up-first-char (char-upcase (string-ref str 0)))
(define rest (cdr (string->list str)))
(define upcase-str (list->string (cons up-first-char rest)))
(define upcase-sym (string->symbol upcase-str))
(datum->syntax stx upcase-sym))
(define current-resolve-symbol-fun (make-parameter (lambda (_) #false)))
(define (resolve-binding-loc stx)
(syntax-local-value stx (lambda () ((current-resolve-symbol-fun) stx))))
(define (resolve-binding-loc-fun stx)
(syntax-local-value stx (lambda () ((current-resolve-symbol-fun) stx))))
(define-syntax-class atom-arg
#:datum-literals (.. || quote)
#:attributes (datum)
(pattern num:number
#:attr datum (lambda () #'num))
(pattern (.. (~or low:number low:id) (~or high:number high:id))
#:attr datum (lambda () #'`(.. ,low ,high)))
(pattern 'sym:id
#:when (is-valid-symbol (syntax-e #'sym))
#:attr datum (lambda () #''sym))
(pattern sym:id
#:when (is-valid-symbol (syntax-e #'sym))
#:with sym-variable (make-variable #'sym)
#:attr datum
(lambda ()
(let ([binding-loc (resolve-binding-loc #'sym-variable)])
(with-syntax ([fake-binder (datum->syntax #'sym #'sym-variable binding-loc)])
#'(begin (let ([fake-binder 1]) sym-variable)
'sym-variable)))))
(pattern (|| arg:atom-arg ...+)
#:attr datum
(lambda ()
(with-syntax ([(data ...) (map (lambda (f) (f)) (attribute arg.datum))])
#'(cons '|| (list data ...)))))
(pattern (sym:id arg:atom-arg ...+)
#:attr datum
(lambda ()
(let ([binding-loc (resolve-binding-loc-fun #'sym)])
(with-syntax ([fake-binder (resolve-binding-loc #'sym)]
[(data ...) (map (lambda (f) (f)) (attribute arg.datum))])
#'(begin (let ([fake-binder 1]) sym)
(cons 'sym (list data ...))))))))
(define-syntax-class atom
#:datum-literals (|| not quote)
#:attributes (datum)
(pattern 'sym:id
#:when (is-valid-symbol (syntax-e #'sym))
#:attr datum (lambda () #''sym))
(pattern sym:id
#:when (is-valid-symbol (syntax-e #'sym))
#:with sym-variable (make-variable #'sym)
#:attr datum
(lambda ()
(let ([binding-loc (resolve-binding-loc #'sym-variable)])
(with-syntax ([fake-binder (datum->syntax #'sym #'sym-variable binding-loc)])
#'(begin (let ([fake-binder #'fake-binder]) sym-variable)
'sym-variable)))))
(pattern (not 'sym:id)
#:when (is-valid-symbol (syntax-e #'sym))
#:attr datum
(lambda () #''(not sym)))
(pattern (not sym:id)
#:when (is-valid-symbol (syntax-e #'sym))
#:with sym-variable (make-variable #'sym)
#:attr datum
(lambda ()
(let ([binding-loc (resolve-binding-loc #'sym-variable)])
(with-syntax ([fake-binder (datum->syntax #'sym #'sym-variable binding-loc)])
#'(begin (let ([fake-binder #'fake-binder]) sym-variable)
(list 'not 'sym-variable))))))
(pattern (not (sym:id arg:atom-arg ...+))
#:when (is-valid-symbol (syntax-e #'sym))
#:attr datum
(lambda ()
(let ([binding-loc (resolve-binding-loc-fun #'sym)])
(with-syntax ([fake-binder (datum->syntax #'sym #'sym binding-loc)]
[(data ...) (map (lambda (f) (f)) (attribute arg.datum))])
#'(begin (let ([fake-binder #'fake-binder]) sym)
(list 'not (cons 'sym (list data ...))))))))
(pattern (|| arg:atom ...+)
#:attr datum
(lambda ()
(with-syntax
([(data ...) (map (lambda (f) (f)) (attribute arg.datum))])
#'(cons '|| (list data ...)))))
(pattern (sym:id arg:atom-arg ...+)
#:attr datum
(lambda ()
(let ([binding-loc (resolve-binding-loc-fun #'sym)]
[fs (attribute arg.datum)])
(with-syntax ([fake-binder (datum->syntax #'sym #'sym binding-loc)]
[(data ...) (map (lambda (f) (f)) fs)])
#'(begin (let ([fake-binder #'sym]) sym)
(cons 'sym (list data ...))))))
))
(define-syntax-class constraint
#:datum-literals (== <= quote)
#:attributes (datum)
(pattern {~braces arg:atom ...}
#:attr datum
(lambda ()
(with-syntax ([(data ...) (map (lambda (f) (f)) (attribute arg.datum))])
#'(cons 'subset (list data ...)))))
(pattern (== {~braces arg:atom ...} (~or card:number card:id))
#:attr datum
(lambda ()
(with-syntax ([(data ...) (map (lambda (f) (f)) (attribute arg.datum))])
#'(card-eq card data ...))))
(pattern (<= (~or lower:number lower:id) {~braces arg:atom ...})
#:attr datum
(lambda ()
(with-syntax ([(data ...) (map (lambda (f) (f)) (attribute arg.datum))])
#'(card-between #:low lower card data ...))))
(pattern (<= (~or lower:number lower:id)
{~braces arg:atom ...}
(~or upper:number upper:id))
#:attr datum
(lambda ()
(with-syntax ([(data ...) (map (lambda (f) (f)) (attribute arg.datum))])
#'(card-between #:low lower #:high upper card data ...))))
(pattern (<= {~braces arg:atom ...} (~or upper:number upper:id))
#:attr datum
(lambda ()
(with-syntax ([(data ...) (map (lambda (f) (f)) (attribute arg.datum))])
#'(card-between #:high upper card data ...))))
(pattern term:atom
#:attr datum (lambda () ((attribute term.datum))))))
(define-syntax (clingo-atom stx)
(syntax-parse stx
[(_ data:atom) ((attribute data.datum))]))
(define-syntax (clingo-constraint stx)
(syntax-parse stx
[(_ data:constraint) ((attribute data.datum))]))
(define-syntax (clingo-rule stx)
(syntax-parse stx
[(_ #false rhs ...)
#'(rule #false
(list (clingo-constraint rhs) ...))]
[(_ lhs:constraint rhs ...)
(define defined-variables '())
(define (handle-definition stx)
(set! defined-variables (cons stx defined-variables))
stx)
(define data
(parameterize ([current-resolve-symbol-fun handle-definition])
((attribute lhs.datum))))
(with-syntax ([lhs-datum data]
[(var ...) defined-variables])
#'(let-syntax ([var #'var] ...)
(rule lhs-datum
(list (clingo-constraint rhs) ...))))
]))