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1228 lines
66 KiB
Scheme
1228 lines
66 KiB
Scheme
;; Library: sxml-match
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;; Author: Jim Bender
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;; Version: 1.1, version for PLT Scheme
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;;
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;; Copyright 2005-9, Jim Bender
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;; sxml-match is released under the MIT License
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;;
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(define-module (sxml-match)
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#:export (sxml-match
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sxml-match-let
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sxml-match-let*)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-11))
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;;;
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;;; PLT compatibility layer.
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;;;
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(define-syntax syntax-object->datum
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(syntax-rules ()
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((_ stx)
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(syntax->datum stx))))
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(define-syntax void
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(syntax-rules ()
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((_) *unspecified*)))
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(define-syntax call/ec
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;; aka. `call-with-escape-continuation'
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(syntax-rules ()
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((_ proc)
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(let ((prompt (gensym)))
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(call-with-prompt prompt
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(lambda ()
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(proc (lambda args
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(apply abort-to-prompt
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prompt args))))
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(lambda (k . args)
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(apply values args)))))))
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(define-syntax let/ec
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(syntax-rules ()
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((_ cont body ...)
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(call/ec (lambda (cont) body ...)))))
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(define (raise-syntax-error x msg obj sub)
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(throw 'sxml-match-error x msg obj sub))
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;;;
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;;; Body, unmodified from
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;;; http://planet.plt-scheme.org/package-source/jim/sxml-match.plt/1/1/sxml-match.ss
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;;; except for:
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;;;
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;;; 1. The PLT-specific `module' form.
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;;;
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;;; 2. In `sxml-match1', ESCAPE is called with `call-with-values' instead
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;;; of being called "normally", such that the example below returns the
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;;; values `x' and `y' instead of just `x':
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;;;
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;;; (sxml-match '(foo) ((bar) (values 'p 'q)) ((foo) (values 'x 'y)))
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;;;
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(define (nodeset? x)
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(or (and (pair? x) (not (symbol? (car x)))) (null? x)))
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(define (xml-element-tag s)
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(if (and (pair? s) (symbol? (car s)))
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(car s)
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(error 'xml-element-tag "expected an xml-element, given" s)))
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(define (xml-element-attributes s)
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(if (and (pair? s) (symbol? (car s)))
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(fold-right (lambda (a b)
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(if (and (pair? a) (eq? '@ (car a)))
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(if (null? b)
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(filter (lambda (i) (not (and (pair? i) (eq? '@ (car i))))) (cdr a))
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(fold-right (lambda (c d)
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(if (and (pair? c) (eq? '@ (car c)))
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d
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(cons c d)))
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b (cdr a)))
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b))
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'()
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(cdr s))
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(error 'xml-element-attributes "expected an xml-element, given" s)))
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(define (xml-element-contents s)
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(if (and (pair? s) (symbol? (car s)))
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(filter (lambda (i)
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(not (and (pair? i) (eq? '@ (car i)))))
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(cdr s))
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(error 'xml-element-contents "expected an xml-element, given" s)))
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(define (match-xml-attribute key l)
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(if (not (pair? l))
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#f
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(if (eq? (car (car l)) key)
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(car l)
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(match-xml-attribute key (cdr l)))))
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(define (filter-attributes keys lst)
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(if (null? lst)
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'()
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(if (member (caar lst) keys)
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(filter-attributes keys (cdr lst))
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(cons (car lst) (filter-attributes keys (cdr lst))))))
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(define-syntax compile-clause
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(lambda (stx)
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(letrec
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([sxml-match-syntax-error
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(lambda (msg exp sub)
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(raise-syntax-error #f msg (with-syntax ([s exp]) (syntax (sxml-match s))) sub))]
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[ellipsis?
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(lambda (stx)
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(and (identifier? stx) (eq? '... (syntax->datum stx))))]
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[literal?
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(lambda (stx)
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(let ([x (syntax->datum stx)])
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(or (string? x)
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(char? x)
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(number? x)
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(boolean? x))))]
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[keyword?
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(lambda (stx)
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(and (identifier? stx)
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(let ([str (symbol->string (syntax->datum stx))])
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(char=? #\: (string-ref str (- (string-length str) 1))))))]
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[extract-cata-fun
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(lambda (cf)
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(syntax-case cf ()
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[#f #f]
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[other cf]))]
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[add-pat-var
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(lambda (pvar pvar-lst)
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(define (check-pvar lst)
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(if (null? lst)
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(void)
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(if (bound-identifier=? (car lst) pvar)
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(sxml-match-syntax-error "duplicate pattern variable not allowed"
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stx
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pvar)
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(check-pvar (cdr lst)))))
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(check-pvar pvar-lst)
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(cons pvar pvar-lst))]
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[add-cata-def
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(lambda (depth cvars cfun ctemp cdefs)
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(cons (list depth cvars cfun ctemp) cdefs))]
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[process-cata-exp
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(lambda (depth cfun ctemp)
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(if (= depth 0)
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(with-syntax ([cf cfun]
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[ct ctemp])
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(syntax (cf ct)))
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(let ([new-ctemp (car (generate-temporaries (list ctemp)))])
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(with-syntax ([ct ctemp]
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[nct new-ctemp]
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[body (process-cata-exp (- depth 1) cfun new-ctemp)])
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(syntax (map (lambda (nct) body) ct))))))]
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[process-cata-defs
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(lambda (cata-defs body)
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(if (null? cata-defs)
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body
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(with-syntax ([(cata-binding ...)
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(map (lambda (def)
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(with-syntax ([bvar (cadr def)]
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[bval (process-cata-exp (car def)
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(caddr def)
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(cadddr def))])
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(syntax (bvar bval))))
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cata-defs)]
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[body-stx body])
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(syntax (let-values (cata-binding ...)
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body-stx)))))]
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[cata-defs->pvar-lst
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(lambda (lst)
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(if (null? lst)
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'()
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(let iter ([items (cadr (car lst))])
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(syntax-case items ()
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[() (cata-defs->pvar-lst (cdr lst))]
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[(fst . rst) (cons (syntax fst) (iter (syntax rst)))]))))]
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[process-output-action
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(lambda (action dotted-vars)
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(define (finite-lst? lst)
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(syntax-case lst ()
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(item
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(identifier? (syntax item))
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#f)
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(()
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#t)
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((fst dots . rst)
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(ellipsis? (syntax dots))
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#f)
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((fst . rst)
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(finite-lst? (syntax rst)))))
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(define (expand-lst lst)
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(syntax-case lst ()
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[() (syntax '())]
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[item
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(identifier? (syntax item))
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(syntax item)]
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[(fst dots . rst)
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(ellipsis? (syntax dots))
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(with-syntax ([exp-lft (expand-dotted-item
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(process-output-action (syntax fst)
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dotted-vars))]
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[exp-rgt (expand-lst (syntax rst))])
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(syntax (append exp-lft exp-rgt)))]
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[(fst . rst)
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(with-syntax ([exp-lft (process-output-action (syntax fst)
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dotted-vars)]
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[exp-rgt (expand-lst (syntax rst))])
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(syntax (cons exp-lft exp-rgt)))]))
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(define (member-var? var lst)
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(let iter ([lst lst])
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(if (null? lst)
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#f
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(if (or (bound-identifier=? var (car lst))
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(free-identifier=? var (car lst)))
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#t
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(iter (cdr lst))))))
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(define (dotted-var? var)
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(member-var? var dotted-vars))
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(define (merge-pvars lst1 lst2)
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(if (null? lst1)
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lst2
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(if (member-var? (car lst1) lst2)
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(merge-pvars (cdr lst1) lst2)
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(cons (car lst1) (merge-pvars (cdr lst1) lst2)))))
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(define (select-dotted-vars x)
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(define (walk-quasi-body y)
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(syntax-case y (unquote unquote-splicing)
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[((unquote a) . rst)
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(merge-pvars (select-dotted-vars (syntax a))
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(walk-quasi-body (syntax rst)))]
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[((unquote-splicing a) . rst)
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(merge-pvars (select-dotted-vars (syntax a))
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(walk-quasi-body (syntax rst)))]
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[(fst . rst)
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(merge-pvars (walk-quasi-body (syntax fst))
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(walk-quasi-body (syntax rst)))]
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[other
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'()]))
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(syntax-case x (quote quasiquote)
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[(quote . rst) '()]
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[(quasiquote . rst) (walk-quasi-body (syntax rst))]
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[(fst . rst)
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(merge-pvars (select-dotted-vars (syntax fst))
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(select-dotted-vars (syntax rst)))]
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[item
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(and (identifier? (syntax item))
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(dotted-var? (syntax item)))
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(list (syntax item))]
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[item '()]))
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(define (expand-dotted-item item)
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(let ([dvars (select-dotted-vars item)])
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(syntax-case item ()
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[x
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(identifier? (syntax x))
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(syntax x)]
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[x (with-syntax ([(dv ...) dvars])
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(syntax (map (lambda (dv ...) x) dv ...)))])))
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(define (expand-quasiquote-body x)
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(syntax-case x (unquote unquote-splicing quasiquote)
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[(quasiquote . rst) (process-quasiquote x)]
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[(unquote item)
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(with-syntax ([expanded-item (process-output-action (syntax item)
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dotted-vars)])
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(syntax (unquote expanded-item)))]
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[(unquote-splicing item)
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(with-syntax ([expanded-item (process-output-action (syntax item)
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dotted-vars)])
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(syntax (unquote-splicing expanded-item)))]
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[((unquote item) dots . rst)
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(ellipsis? (syntax dots))
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(with-syntax ([expanded-item (expand-dotted-item
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(process-output-action (syntax item)
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dotted-vars))]
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[expanded-rst (expand-quasiquote-body (syntax rst))])
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(syntax ((unquote-splicing expanded-item) . expanded-rst)))]
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[(item dots . rst)
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(ellipsis? (syntax dots))
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(with-syntax ([expanded-item (expand-dotted-item
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(process-output-action (syntax (quasiquote item))
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dotted-vars))]
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[expanded-rst (expand-quasiquote-body (syntax rst))])
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(syntax ((unquote-splicing expanded-item) . expanded-rst)))]
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[(fst . rst)
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(with-syntax ([expanded-fst (expand-quasiquote-body (syntax fst))]
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[expanded-rst (expand-quasiquote-body (syntax rst))])
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(syntax (expanded-fst . expanded-rst)))]
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[other x]))
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(define (process-quasiquote x)
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(syntax-case x ()
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[(quasiquote term) (with-syntax ([expanded-body (expand-quasiquote-body (syntax term))])
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(syntax (quasiquote expanded-body)))]
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[else (sxml-match-syntax-error "bad quasiquote-form"
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stx
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x)]))
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(syntax-case action (quote quasiquote)
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[(quote . rst) action]
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[(quasiquote . rst) (process-quasiquote action)]
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[(fst . rst) (if (finite-lst? action)
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(with-syntax ([exp-lft (process-output-action (syntax fst) dotted-vars)]
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[exp-rgt (process-output-action (syntax rst) dotted-vars)])
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(syntax (exp-lft . exp-rgt)))
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(with-syntax ([exp-lft (process-output-action (syntax fst)
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dotted-vars)]
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[exp-rgt (expand-lst (syntax rst))])
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(syntax (apply exp-lft exp-rgt))))]
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[item action]))]
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[compile-element-pat
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(lambda (ele exp nextp fail-k pvar-lst depth cata-fun cata-defs dotted-vars)
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(syntax-case ele (@)
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[(tag (@ . attr-items) . items)
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(identifier? (syntax tag))
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(let ([attr-exp (car (generate-temporaries (list exp)))]
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[body-exp (car (generate-temporaries (list exp)))])
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(let-values ([(tests new-pvar-lst new-cata-defs new-dotted-vars)
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(compile-attr-list (syntax attr-items)
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(syntax items)
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attr-exp
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body-exp
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'()
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nextp
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fail-k
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pvar-lst
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depth
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cata-fun
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cata-defs
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dotted-vars)])
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(values (with-syntax ([x exp]
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[ax attr-exp]
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[bx body-exp]
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[body tests]
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[fail-to fail-k])
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(syntax (if (and (pair? x) (eq? 'tag (xml-element-tag x)))
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(let ([ax (xml-element-attributes x)]
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[bx (xml-element-contents x)])
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body)
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(fail-to))))
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new-pvar-lst
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new-cata-defs
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new-dotted-vars)))]
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[(tag . items)
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(identifier? (syntax tag))
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(let ([body-exp (car (generate-temporaries (list exp)))])
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(let-values ([(tests new-pvar-lst new-cata-defs new-dotted-vars)
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(compile-item-list (syntax items)
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body-exp
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nextp
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||
fail-k
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||
#t
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||
pvar-lst
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||
depth
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||
cata-fun
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||
cata-defs
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||
dotted-vars)])
|
||
(values (with-syntax ([x exp]
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[bx body-exp]
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[body tests]
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[fail-to fail-k])
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(syntax (if (and (pair? x) (eq? 'tag (xml-element-tag x)))
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(let ([bx (xml-element-contents x)])
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body)
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(fail-to))))
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new-pvar-lst
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||
new-cata-defs
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||
new-dotted-vars)))]))]
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||
[compile-end-element
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||
(lambda (exp nextp fail-k pvar-lst cata-defs dotted-vars)
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||
(let-values ([(next-tests new-pvar-lst new-cata-defs new-dotted-vars)
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||
(nextp pvar-lst cata-defs dotted-vars)])
|
||
(values (with-syntax ([x exp]
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[body next-tests]
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[fail-to fail-k])
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(syntax (if (null? x) body (fail-to))))
|
||
new-pvar-lst
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new-cata-defs
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||
new-dotted-vars)))]
|
||
[compile-attr-list
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||
(lambda (attr-lst body-lst attr-exp body-exp attr-key-lst nextp fail-k pvar-lst depth cata-fun cata-defs dotted-vars)
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||
(syntax-case attr-lst (unquote ->)
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||
[(unquote var)
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||
(identifier? (syntax var))
|
||
(let-values ([(tests new-pvar-lst new-cata-defs new-dotted-vars)
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||
(compile-item-list body-lst
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||
body-exp
|
||
nextp
|
||
fail-k
|
||
#t
|
||
(add-pat-var (syntax var) pvar-lst)
|
||
depth
|
||
cata-fun
|
||
cata-defs
|
||
dotted-vars)])
|
||
(values (with-syntax ([ax attr-exp]
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||
[matched-attrs attr-key-lst]
|
||
[body tests])
|
||
(syntax (let ([var (filter-attributes 'matched-attrs ax)])
|
||
body)))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars))]
|
||
[((atag [(unquote [cata -> cvar ...]) default]) . rst)
|
||
(identifier? (syntax atag))
|
||
(let ([ctemp (car (generate-temporaries (syntax ([cvar ...]))))])
|
||
(let-values ([(tests new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(compile-attr-list (syntax rst)
|
||
body-lst
|
||
attr-exp
|
||
body-exp
|
||
(cons (syntax atag) attr-key-lst)
|
||
nextp
|
||
fail-k
|
||
(add-pat-var ctemp pvar-lst)
|
||
depth
|
||
cata-fun
|
||
(add-cata-def depth
|
||
(syntax [cvar ...])
|
||
(syntax cata)
|
||
ctemp
|
||
cata-defs)
|
||
dotted-vars)])
|
||
(values (with-syntax ([ax attr-exp]
|
||
[ct ctemp]
|
||
[body tests])
|
||
(syntax (let ([binding (match-xml-attribute 'atag ax)])
|
||
(let ([ct (if binding
|
||
(cadr binding)
|
||
default)])
|
||
body))))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars)))]
|
||
[((atag [(unquote [cvar ...]) default]) . rst)
|
||
(identifier? (syntax atag))
|
||
(let ([ctemp (car (generate-temporaries (syntax ([cvar ...]))))])
|
||
(if (not cata-fun)
|
||
(sxml-match-syntax-error "sxml-match pattern: catamorphism not allowed in this context"
|
||
stx
|
||
(syntax [cvar ...])))
|
||
(let-values ([(tests new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(compile-attr-list (syntax rst)
|
||
body-lst
|
||
attr-exp
|
||
body-exp
|
||
(cons (syntax atag) attr-key-lst)
|
||
nextp
|
||
fail-k
|
||
(add-pat-var ctemp pvar-lst)
|
||
depth
|
||
cata-fun
|
||
(add-cata-def depth
|
||
(syntax [cvar ...])
|
||
cata-fun
|
||
ctemp
|
||
cata-defs)
|
||
dotted-vars)])
|
||
(values (with-syntax ([ax attr-exp]
|
||
[ct ctemp]
|
||
[body tests])
|
||
(syntax (let ([binding (match-xml-attribute 'atag ax)])
|
||
(let ([ct (if binding
|
||
(cadr binding)
|
||
default)])
|
||
body))))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars)))]
|
||
[((atag [(unquote var) default]) . rst)
|
||
(and (identifier? (syntax atag)) (identifier? (syntax var)))
|
||
(let-values ([(tests new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(compile-attr-list (syntax rst)
|
||
body-lst
|
||
attr-exp
|
||
body-exp
|
||
(cons (syntax atag) attr-key-lst)
|
||
nextp
|
||
fail-k
|
||
(add-pat-var (syntax var) pvar-lst)
|
||
depth
|
||
cata-fun
|
||
cata-defs
|
||
dotted-vars)])
|
||
(values (with-syntax ([ax attr-exp]
|
||
[body tests])
|
||
(syntax (let ([binding (match-xml-attribute 'atag ax)])
|
||
(let ([var (if binding
|
||
(cadr binding)
|
||
default)])
|
||
body))))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars))]
|
||
[((atag (unquote [cata -> cvar ...])) . rst)
|
||
(identifier? (syntax atag))
|
||
(let ([ctemp (car (generate-temporaries (syntax ([cvar ...]))))])
|
||
(let-values ([(tests new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(compile-attr-list (syntax rst)
|
||
body-lst
|
||
attr-exp
|
||
body-exp
|
||
(cons (syntax atag) attr-key-lst)
|
||
nextp
|
||
fail-k
|
||
(add-pat-var ctemp pvar-lst)
|
||
depth
|
||
cata-fun
|
||
(add-cata-def depth
|
||
(syntax [cvar ...])
|
||
(syntax cata)
|
||
ctemp
|
||
cata-defs)
|
||
dotted-vars)])
|
||
(values (with-syntax ([ax attr-exp]
|
||
[ct ctemp]
|
||
[body tests]
|
||
[fail-to fail-k])
|
||
(syntax (let ([binding (match-xml-attribute 'atag ax)])
|
||
(if binding
|
||
(let ([ct (cadr binding)])
|
||
body)
|
||
(fail-to)))))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars)))]
|
||
[((atag (unquote [cvar ...])) . rst)
|
||
(identifier? (syntax atag))
|
||
(let ([ctemp (car (generate-temporaries (syntax ([cvar ...]))))])
|
||
(if (not cata-fun)
|
||
(sxml-match-syntax-error "sxml-match pattern: catamorphism not allowed in this context"
|
||
stx
|
||
(syntax [cvar ...])))
|
||
(let-values ([(tests new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(compile-attr-list (syntax rst)
|
||
body-lst
|
||
attr-exp
|
||
body-exp
|
||
(cons (syntax atag) attr-key-lst)
|
||
nextp
|
||
fail-k
|
||
(add-pat-var ctemp pvar-lst)
|
||
depth
|
||
cata-fun
|
||
(add-cata-def depth
|
||
(syntax [cvar ...])
|
||
cata-fun
|
||
ctemp
|
||
cata-defs)
|
||
dotted-vars)])
|
||
(values (with-syntax ([ax attr-exp]
|
||
[ct ctemp]
|
||
[body tests]
|
||
[fail-to fail-k])
|
||
(syntax (let ([binding (match-xml-attribute 'atag ax)])
|
||
(if binding
|
||
(let ([ct (cadr binding)])
|
||
body)
|
||
(fail-to)))))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars)))]
|
||
[((atag (unquote var)) . rst)
|
||
(and (identifier? (syntax atag)) (identifier? (syntax var)))
|
||
(let-values ([(tests new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(compile-attr-list (syntax rst)
|
||
body-lst
|
||
attr-exp
|
||
body-exp
|
||
(cons (syntax atag) attr-key-lst)
|
||
nextp
|
||
fail-k
|
||
(add-pat-var (syntax var) pvar-lst)
|
||
depth
|
||
cata-fun
|
||
cata-defs
|
||
dotted-vars)])
|
||
(values (with-syntax ([ax attr-exp]
|
||
[body tests]
|
||
[fail-to fail-k])
|
||
(syntax (let ([binding (match-xml-attribute 'atag ax)])
|
||
(if binding
|
||
(let ([var (cadr binding)])
|
||
body)
|
||
(fail-to)))))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars))]
|
||
[((atag (i ...)) . rst)
|
||
(identifier? (syntax atag))
|
||
(sxml-match-syntax-error "bad attribute pattern"
|
||
stx
|
||
(syntax (kwd (i ...))))]
|
||
[((atag i) . rst)
|
||
(and (identifier? (syntax atag)) (identifier? (syntax i)))
|
||
(sxml-match-syntax-error "bad attribute pattern"
|
||
stx
|
||
(syntax (kwd i)))]
|
||
[((atag literal) . rst)
|
||
(and (identifier? (syntax atag)) (literal? (syntax literal)))
|
||
(let-values ([(tests new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(compile-attr-list (syntax rst)
|
||
body-lst
|
||
attr-exp
|
||
body-exp
|
||
(cons (syntax atag) attr-key-lst)
|
||
nextp
|
||
fail-k
|
||
pvar-lst
|
||
depth
|
||
cata-fun
|
||
cata-defs
|
||
dotted-vars)])
|
||
(values (with-syntax ([ax attr-exp]
|
||
[body tests]
|
||
[fail-to fail-k])
|
||
(syntax (let ([binding (match-xml-attribute 'atag ax)])
|
||
(if binding
|
||
(if (equal? (cadr binding) literal)
|
||
body
|
||
(fail-to))
|
||
(fail-to)))))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars))]
|
||
[()
|
||
(compile-item-list body-lst
|
||
body-exp
|
||
nextp
|
||
fail-k
|
||
#t
|
||
pvar-lst
|
||
depth
|
||
cata-fun
|
||
cata-defs
|
||
dotted-vars)]))]
|
||
[compile-item-list
|
||
(lambda (lst exp nextp fail-k ellipsis-allowed? pvar-lst depth cata-fun cata-defs dotted-vars)
|
||
(syntax-case lst (unquote ->)
|
||
[() (compile-end-element exp nextp fail-k pvar-lst cata-defs dotted-vars)]
|
||
[(unquote var)
|
||
(identifier? (syntax var))
|
||
(if (not ellipsis-allowed?)
|
||
(sxml-match-syntax-error "improper list pattern not allowed in this context"
|
||
stx
|
||
(syntax dots))
|
||
(let-values ([(next-tests new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(nextp (add-pat-var (syntax var) pvar-lst) cata-defs dotted-vars)])
|
||
(values (with-syntax ([x exp]
|
||
[body next-tests])
|
||
(syntax (let ([var x]) body)))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars)))]
|
||
[(unquote [cata -> cvar ...])
|
||
(if (not ellipsis-allowed?)
|
||
(sxml-match-syntax-error "improper list pattern not allowed in this context"
|
||
stx
|
||
(syntax dots))
|
||
(let ([ctemp (car (generate-temporaries (syntax ([cvar ...]))))])
|
||
(let-values ([(next-tests new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(nextp (add-pat-var ctemp pvar-lst)
|
||
(add-cata-def depth
|
||
(syntax [cvar ...])
|
||
(syntax cata)
|
||
ctemp
|
||
cata-defs)
|
||
dotted-vars)])
|
||
(values (with-syntax ([ct ctemp]
|
||
[x exp]
|
||
[body next-tests])
|
||
(syntax (let ([ct x]) body)))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars))))]
|
||
[(unquote [cvar ...])
|
||
(let ([ctemp (car (generate-temporaries (syntax ([cvar ...]))))])
|
||
(if (not cata-fun)
|
||
(sxml-match-syntax-error "sxml-match pattern: catamorphism not allowed in this context"
|
||
stx
|
||
(syntax [cvar ...])))
|
||
(let-values ([(next-tests new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(nextp (add-pat-var ctemp pvar-lst)
|
||
(add-cata-def depth
|
||
(syntax [cvar ...])
|
||
cata-fun
|
||
ctemp
|
||
cata-defs)
|
||
dotted-vars)])
|
||
(values (with-syntax ([ct ctemp]
|
||
[x exp]
|
||
[body next-tests])
|
||
(syntax (let ([ct x]) body)))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars)))]
|
||
[(item dots . rst)
|
||
(ellipsis? (syntax dots))
|
||
(if (not ellipsis-allowed?)
|
||
(sxml-match-syntax-error "ellipses not allowed in this context"
|
||
stx
|
||
(syntax dots))
|
||
(compile-dotted-pattern-list (syntax item)
|
||
(syntax rst)
|
||
exp
|
||
nextp
|
||
fail-k
|
||
pvar-lst
|
||
depth
|
||
cata-fun
|
||
cata-defs
|
||
dotted-vars))]
|
||
[(item . rst)
|
||
(compile-item (syntax item)
|
||
exp
|
||
(lambda (new-exp new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(compile-item-list (syntax rst)
|
||
new-exp
|
||
nextp
|
||
fail-k
|
||
ellipsis-allowed?
|
||
new-pvar-lst
|
||
depth
|
||
cata-fun
|
||
new-cata-defs
|
||
new-dotted-vars))
|
||
fail-k
|
||
pvar-lst
|
||
depth
|
||
cata-fun
|
||
cata-defs
|
||
dotted-vars)]))]
|
||
[compile-dotted-pattern-list
|
||
(lambda (item
|
||
tail
|
||
exp
|
||
nextp
|
||
fail-k
|
||
pvar-lst
|
||
depth
|
||
cata-fun
|
||
cata-defs
|
||
dotted-vars)
|
||
(let-values ([(tail-tests tail-pvar-lst tail-cata-defs tail-dotted-vars)
|
||
(compile-item-list tail
|
||
(syntax lst)
|
||
(lambda (new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(values (with-syntax ([(npv ...) new-pvar-lst])
|
||
(syntax (values #t npv ...)))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars))
|
||
(syntax fail)
|
||
#f
|
||
'()
|
||
depth
|
||
'()
|
||
'()
|
||
dotted-vars)]
|
||
[(item-tests item-pvar-lst item-cata-defs item-dotted-vars)
|
||
(compile-item item
|
||
(syntax lst)
|
||
(lambda (new-exp new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(values (with-syntax ([(npv ...) new-pvar-lst])
|
||
(syntax (values #t (cdr lst) npv ...)))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars))
|
||
(syntax fail)
|
||
'()
|
||
(+ 1 depth)
|
||
cata-fun
|
||
'()
|
||
dotted-vars)])
|
||
; more here: check for duplicate pat-vars, cata-defs
|
||
(let-values ([(final-tests final-pvar-lst final-cata-defs final-dotted-vars)
|
||
(nextp (append tail-pvar-lst item-pvar-lst pvar-lst)
|
||
(append tail-cata-defs item-cata-defs cata-defs)
|
||
(append item-pvar-lst
|
||
(cata-defs->pvar-lst item-cata-defs)
|
||
tail-dotted-vars
|
||
dotted-vars))])
|
||
(let ([temp-item-pvar-lst (generate-temporaries item-pvar-lst)])
|
||
(values
|
||
(with-syntax
|
||
([x exp]
|
||
[fail-to fail-k]
|
||
[tail-body tail-tests]
|
||
[item-body item-tests]
|
||
[final-body final-tests]
|
||
[(ipv ...) item-pvar-lst]
|
||
[(gpv ...) temp-item-pvar-lst]
|
||
[(tpv ...) tail-pvar-lst]
|
||
[(item-void ...) (map (lambda (i) (syntax (void))) item-pvar-lst)]
|
||
[(tail-void ...) (map (lambda (i) (syntax (void))) tail-pvar-lst)]
|
||
[(item-null ...) (map (lambda (i) (syntax '())) item-pvar-lst)]
|
||
[(item-cons ...) (map (lambda (a b)
|
||
(with-syntax ([xa a]
|
||
[xb b])
|
||
(syntax (cons xa xb))))
|
||
item-pvar-lst
|
||
temp-item-pvar-lst)])
|
||
(syntax (letrec ([match-tail
|
||
(lambda (lst fail)
|
||
tail-body)]
|
||
[match-item
|
||
(lambda (lst)
|
||
(let ([fail (lambda ()
|
||
(values #f
|
||
lst
|
||
item-void ...))])
|
||
item-body))]
|
||
[match-dotted
|
||
(lambda (x)
|
||
(let-values ([(tail-res tpv ...)
|
||
(match-tail x
|
||
(lambda ()
|
||
(values #f
|
||
tail-void ...)))])
|
||
(if tail-res
|
||
(values item-null ...
|
||
tpv ...)
|
||
(let-values ([(res new-x ipv ...) (match-item x)])
|
||
(if res
|
||
(let-values ([(gpv ... tpv ...)
|
||
(match-dotted new-x)])
|
||
(values item-cons ... tpv ...))
|
||
(let-values ([(last-tail-res tpv ...)
|
||
(match-tail x fail-to)])
|
||
(values item-null ... tpv ...)))))))])
|
||
(let-values ([(ipv ... tpv ...)
|
||
(match-dotted x)])
|
||
final-body))))
|
||
final-pvar-lst
|
||
final-cata-defs
|
||
final-dotted-vars)))))]
|
||
[compile-item
|
||
(lambda (item exp nextp fail-k pvar-lst depth cata-fun cata-defs dotted-vars)
|
||
(syntax-case item (unquote ->)
|
||
; normal pattern var
|
||
[(unquote var)
|
||
(identifier? (syntax var))
|
||
(let ([new-exp (car (generate-temporaries (list exp)))])
|
||
(let-values ([(next-tests new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(nextp new-exp (add-pat-var (syntax var) pvar-lst) cata-defs dotted-vars)])
|
||
(values (with-syntax ([x exp]
|
||
[nx new-exp]
|
||
[body next-tests]
|
||
[fail-to fail-k])
|
||
(syntax (if (pair? x)
|
||
(let ([nx (cdr x)]
|
||
[var (car x)])
|
||
body)
|
||
(fail-to))))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars)))]
|
||
; named catamorphism
|
||
[(unquote [cata -> cvar ...])
|
||
(let ([new-exp (car (generate-temporaries (list exp)))]
|
||
[ctemp (car (generate-temporaries (syntax ([cvar ...]))))])
|
||
(let-values ([(next-tests new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(nextp new-exp
|
||
(add-pat-var ctemp pvar-lst)
|
||
(add-cata-def depth
|
||
(syntax [cvar ...])
|
||
(syntax cata)
|
||
ctemp
|
||
cata-defs)
|
||
dotted-vars)])
|
||
(values (with-syntax ([x exp]
|
||
[nx new-exp]
|
||
[ct ctemp]
|
||
[body next-tests]
|
||
[fail-to fail-k])
|
||
(syntax (if (pair? x)
|
||
(let ([nx (cdr x)]
|
||
[ct (car x)])
|
||
body)
|
||
(fail-to))))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars)))]
|
||
; basic catamorphism
|
||
[(unquote [cvar ...])
|
||
(let ([new-exp (car (generate-temporaries (list exp)))]
|
||
[ctemp (car (generate-temporaries (syntax ([cvar ...]))))])
|
||
(if (not cata-fun)
|
||
(sxml-match-syntax-error "sxml-match pattern: catamorphism not allowed in this context"
|
||
stx
|
||
(syntax [cvar ...])))
|
||
(let-values ([(next-tests new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(nextp new-exp
|
||
(add-pat-var ctemp pvar-lst)
|
||
(add-cata-def depth
|
||
(syntax [cvar ...])
|
||
cata-fun
|
||
ctemp
|
||
cata-defs)
|
||
dotted-vars)])
|
||
(values (with-syntax ([x exp]
|
||
[nx new-exp]
|
||
[ct ctemp]
|
||
[body next-tests]
|
||
[fail-to fail-k])
|
||
(syntax (if (pair? x)
|
||
(let ([nx (cdr x)]
|
||
[ct (car x)])
|
||
body)
|
||
(fail-to))))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars)))]
|
||
[(tag item ...)
|
||
(identifier? (syntax tag))
|
||
(let ([new-exp (car (generate-temporaries (list exp)))])
|
||
(let-values ([(after-tests after-pvar-lst after-cata-defs after-dotted-vars)
|
||
(compile-element-pat (syntax (tag item ...))
|
||
(with-syntax ([x exp])
|
||
(syntax (car x)))
|
||
(lambda (more-pvar-lst more-cata-defs more-dotted-vars)
|
||
(let-values ([(next-tests new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars)
|
||
(nextp new-exp
|
||
more-pvar-lst
|
||
more-cata-defs
|
||
more-dotted-vars)])
|
||
(values (with-syntax ([x exp]
|
||
[nx new-exp]
|
||
[body next-tests])
|
||
(syntax (let ([nx (cdr x)])
|
||
body)))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars)))
|
||
fail-k
|
||
pvar-lst
|
||
depth
|
||
cata-fun
|
||
cata-defs
|
||
dotted-vars)])
|
||
; test that we are not at the end of an item-list, BEFORE
|
||
; entering tests for the element pattern (against the 'car' of the item-list)
|
||
(values (with-syntax ([x exp]
|
||
[body after-tests]
|
||
[fail-to fail-k])
|
||
(syntax (if (pair? x)
|
||
body
|
||
(fail-to))))
|
||
after-pvar-lst
|
||
after-cata-defs
|
||
after-dotted-vars)))]
|
||
[(i ...)
|
||
(sxml-match-syntax-error "bad pattern syntax (not an element pattern)"
|
||
stx
|
||
(syntax (i ...)))]
|
||
[i
|
||
(identifier? (syntax i))
|
||
(sxml-match-syntax-error "bad pattern syntax (symbol not allowed in this context)"
|
||
stx
|
||
(syntax i))]
|
||
[literal
|
||
(literal? (syntax literal))
|
||
(let ([new-exp (car (generate-temporaries (list exp)))])
|
||
(let-values ([(next-tests new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(nextp new-exp pvar-lst cata-defs dotted-vars)])
|
||
(values (with-syntax ([x exp]
|
||
[nx new-exp]
|
||
[body next-tests]
|
||
[fail-to fail-k])
|
||
(syntax (if (and (pair? x) (equal? literal (car x)))
|
||
(let ([nx (cdr x)])
|
||
body)
|
||
(fail-to))))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars)))]))])
|
||
(let ([fail-k (syntax failure)])
|
||
(syntax-case stx (unquote guard ->)
|
||
[(compile-clause ((unquote var) (guard gexp ...) action0 action ...)
|
||
exp
|
||
cata-fun
|
||
fail-exp)
|
||
(identifier? (syntax var))
|
||
(syntax (let ([var exp])
|
||
(if (and gexp ...)
|
||
(begin action0 action ...)
|
||
(fail-exp))))]
|
||
[(compile-clause ((unquote [cata -> cvar ...]) (guard gexp ...) action0 action ...)
|
||
exp
|
||
cata-fun
|
||
fail-exp)
|
||
(syntax (if (and gexp ...)
|
||
(let-values ([(cvar ...) (cata exp)])
|
||
(begin action0 action ...))
|
||
(fail-exp)))]
|
||
[(compile-clause ((unquote [cvar ...]) (guard gexp ...) action0 action ...)
|
||
exp
|
||
cata-fun
|
||
fail-exp)
|
||
(if (not (extract-cata-fun (syntax cata-fun)))
|
||
(sxml-match-syntax-error "sxml-match pattern: catamorphism not allowed in this context"
|
||
stx
|
||
(syntax [cvar ...]))
|
||
(syntax (if (and gexp ...)
|
||
(let-values ([(cvar ...) (cata-fun exp)])
|
||
(begin action0 action ...))
|
||
(fail-exp))))]
|
||
[(compile-clause ((unquote var) action0 action ...) exp cata-fun fail-exp)
|
||
(identifier? (syntax var))
|
||
(syntax (let ([var exp])
|
||
action0 action ...))]
|
||
[(compile-clause ((unquote [cata -> cvar ...]) action0 action ...) exp cata-fun fail-exp)
|
||
(syntax (let-values ([(cvar ...) (cata exp)])
|
||
action0 action ...))]
|
||
[(compile-clause ((unquote [cvar ...]) action0 action ...) exp cata-fun fail-exp)
|
||
(if (not (extract-cata-fun (syntax cata-fun)))
|
||
(sxml-match-syntax-error "sxml-match pattern: catamorphism not allowed in this context"
|
||
stx
|
||
(syntax [cvar ...]))
|
||
(syntax (let-values ([(cvar ...) (cata-fun exp)])
|
||
action0 action ...)))]
|
||
[(compile-clause ((lst . rst) (guard gexp ...) action0 action ...) exp cata-fun fail-exp)
|
||
(and (identifier? (syntax lst)) (eq? 'list (syntax->datum (syntax lst))))
|
||
(let-values ([(result pvar-lst cata-defs dotted-vars)
|
||
(compile-item-list (syntax rst)
|
||
(syntax exp)
|
||
(lambda (new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(values
|
||
(with-syntax
|
||
([exp-body (process-cata-defs new-cata-defs
|
||
(process-output-action
|
||
(syntax (begin action0
|
||
action ...))
|
||
new-dotted-vars))]
|
||
[fail-to fail-k])
|
||
(syntax (if (and gexp ...) exp-body (fail-to))))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars))
|
||
fail-k
|
||
#t
|
||
'()
|
||
0
|
||
(extract-cata-fun (syntax cata-fun))
|
||
'()
|
||
'())])
|
||
(with-syntax ([fail-to fail-k]
|
||
[body result])
|
||
(syntax (let ([fail-to fail-exp])
|
||
(if (nodeset? exp)
|
||
body
|
||
(fail-to))))))]
|
||
[(compile-clause ((lst . rst) action0 action ...) exp cata-fun fail-exp)
|
||
(and (identifier? (syntax lst)) (eq? 'list (syntax-object->datum (syntax lst))))
|
||
(let-values ([(result pvar-lst cata-defs dotted-vars)
|
||
(compile-item-list (syntax rst)
|
||
(syntax exp)
|
||
(lambda (new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(values (process-cata-defs new-cata-defs
|
||
(process-output-action
|
||
(syntax (begin action0
|
||
action ...))
|
||
new-dotted-vars))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars))
|
||
fail-k
|
||
#t
|
||
'()
|
||
0
|
||
(extract-cata-fun (syntax cata-fun))
|
||
'()
|
||
'())])
|
||
(with-syntax ([body result]
|
||
[fail-to fail-k])
|
||
(syntax (let ([fail-to fail-exp])
|
||
(if (nodeset? exp)
|
||
body
|
||
(fail-to))))))]
|
||
[(compile-clause ((fst . rst) (guard gexp ...) action0 action ...) exp cata-fun fail-exp)
|
||
(identifier? (syntax fst))
|
||
(let-values ([(result pvar-lst cata-defs dotted-vars)
|
||
(compile-element-pat (syntax (fst . rst))
|
||
(syntax exp)
|
||
(lambda (new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(values
|
||
(with-syntax
|
||
([body (process-cata-defs new-cata-defs
|
||
(process-output-action
|
||
(syntax (begin action0
|
||
action ...))
|
||
new-dotted-vars))]
|
||
[fail-to fail-k])
|
||
(syntax (if (and gexp ...) body (fail-to))))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars))
|
||
fail-k
|
||
'()
|
||
0
|
||
(extract-cata-fun (syntax cata-fun))
|
||
'()
|
||
'())])
|
||
(with-syntax ([fail-to fail-k]
|
||
[body result])
|
||
(syntax (let ([fail-to fail-exp])
|
||
body))))]
|
||
[(compile-clause ((fst . rst) action0 action ...) exp cata-fun fail-exp)
|
||
(identifier? (syntax fst))
|
||
(let-values ([(result pvar-lst cata-defs dotted-vars)
|
||
(compile-element-pat (syntax (fst . rst))
|
||
(syntax exp)
|
||
(lambda (new-pvar-lst new-cata-defs new-dotted-vars)
|
||
(values (process-cata-defs new-cata-defs
|
||
(process-output-action
|
||
(syntax (begin action0
|
||
action ...))
|
||
new-dotted-vars))
|
||
new-pvar-lst
|
||
new-cata-defs
|
||
new-dotted-vars))
|
||
fail-k
|
||
'()
|
||
0
|
||
(extract-cata-fun (syntax cata-fun))
|
||
'()
|
||
'())])
|
||
(with-syntax ([fail-to fail-k]
|
||
[body result])
|
||
(syntax (let ([fail-to fail-exp])
|
||
body))))]
|
||
[(compile-clause ((i ...) (guard gexp ...) action0 action ...) exp cata-fun fail-exp)
|
||
(sxml-match-syntax-error "bad pattern syntax (not an element pattern)"
|
||
stx
|
||
(syntax (i ...)))]
|
||
[(compile-clause ((i ...) action0 action ...) exp cata-fun fail-exp)
|
||
(sxml-match-syntax-error "bad pattern syntax (not an element pattern)"
|
||
stx
|
||
(syntax (i ...)))]
|
||
[(compile-clause (pat (guard gexp ...) action0 action ...) exp cata-fun fail-exp)
|
||
(identifier? (syntax pat))
|
||
(sxml-match-syntax-error "bad pattern syntax (symbol not allowed in this context)"
|
||
stx
|
||
(syntax pat))]
|
||
[(compile-clause (pat action0 action ...) exp cata-fun fail-exp)
|
||
(identifier? (syntax pat))
|
||
(sxml-match-syntax-error "bad pattern syntax (symbol not allowed in this context)"
|
||
stx
|
||
(syntax pat))]
|
||
[(compile-clause (literal (guard gexp ...) action0 action ...) exp cata-fun fail-exp)
|
||
(literal? (syntax literal))
|
||
(syntax (if (and (equal? literal exp) (and gexp ...))
|
||
(begin action0 action ...)
|
||
(fail-exp)))]
|
||
[(compile-clause (literal action0 action ...) exp cata-fun fail-exp)
|
||
(literal? (syntax literal))
|
||
(syntax (if (equal? literal exp)
|
||
(begin action0 action ...)
|
||
(fail-exp)))])))))
|
||
|
||
(define-syntax sxml-match1
|
||
(syntax-rules ()
|
||
[(sxml-match1 exp cata-fun clause)
|
||
(compile-clause clause exp cata-fun
|
||
(lambda () (error 'sxml-match "no matching clause found")))]
|
||
[(sxml-match1 exp cata-fun clause0 clause ...)
|
||
(let/ec escape
|
||
(compile-clause clause0 exp cata-fun
|
||
(lambda () (call-with-values
|
||
(lambda () (sxml-match1 exp cata-fun
|
||
clause ...))
|
||
escape))))]))
|
||
|
||
(define-syntax sxml-match
|
||
(syntax-rules ()
|
||
((sxml-match val clause0 clause ...)
|
||
(letrec ([cfun (lambda (exp)
|
||
(sxml-match1 exp cfun clause0 clause ...))])
|
||
(cfun val)))))
|
||
|
||
(define-syntax sxml-match-let1
|
||
(syntax-rules ()
|
||
[(sxml-match-let1 syntag synform () body0 body ...)
|
||
(let () body0 body ...)]
|
||
[(sxml-match-let1 syntag synform ([pat exp]) body0 body ...)
|
||
(compile-clause (pat (let () body0 body ...))
|
||
exp
|
||
#f
|
||
(lambda () (error 'syntag "could not match pattern ~s" 'pat)))]
|
||
[(sxml-match-let1 syntag synform ([pat0 exp0] [pat exp] ...) body0 body ...)
|
||
(compile-clause (pat0 (sxml-match-let1 syntag synform ([pat exp] ...) body0 body ...))
|
||
exp0
|
||
#f
|
||
(lambda () (error 'syntag "could not match pattern ~s" 'pat0)))]))
|
||
|
||
(define-syntax sxml-match-let-help
|
||
(lambda (stx)
|
||
(syntax-case stx ()
|
||
[(sxml-match-let-help syntag synform ([pat exp] ...) body0 body ...)
|
||
(with-syntax ([(temp-name ...) (generate-temporaries (syntax (exp ...)))])
|
||
(syntax (let ([temp-name exp] ...)
|
||
(sxml-match-let1 syntag synform ([pat temp-name] ...) body0 body ...))))])))
|
||
|
||
(define-syntax sxml-match-let
|
||
(lambda (stx)
|
||
(syntax-case stx ()
|
||
[(sxml-match-let ([pat exp] ...) body0 body ...)
|
||
(with-syntax ([synform stx])
|
||
(syntax (sxml-match-let-help sxml-match-let synform ([pat exp] ...) body0 body ...)))])))
|
||
|
||
(define-syntax sxml-match-let*
|
||
(lambda (stx)
|
||
(syntax-case stx ()
|
||
[(sxml-match-let* () body0 body ...)
|
||
(syntax (let () body0 body ...))]
|
||
[(sxml-match-let* ([pat0 exp0] [pat exp] ...) body0 body ...)
|
||
(with-syntax ([synform stx])
|
||
(syntax (sxml-match-let-help sxml-match-let* synform ([pat0 exp0])
|
||
(sxml-match-let* ([pat exp] ...)
|
||
body0 body ...))))])))
|