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301 lines
10 KiB
Scheme
301 lines
10 KiB
Scheme
;;;; Cyclone Scheme
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;;;; https://github.com/justinethier/cyclone
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;;;;
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;;;; Copyright (c) 2014-2016, Justin Ethier
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;;;; All rights reserved.
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;;;;
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;;;; This is based on the implementation from SRFI 69.
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;;;;
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;(define-library (srfi 69)
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; (export
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; ;;Type constructors and predicate
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; make-hash-table
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; hash-table?
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; alist->hash-table
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; ;;Reflective queries
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; hash-table-equivalence-function
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; hash-table-hash-function
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; ;;Dealing with single elements
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; hash-table-ref
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; hash-table-ref/default
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; hash-table-set!
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; hash-table-delete!
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; hash-table-exists?
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; hash-table-update!
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; hash-table-update!/default
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; ;;Dealing with the whole contents
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; hash-table-size
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; hash-table-keys
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; hash-table-values
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; hash-table-walk
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; hash-table-fold
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; hash-table->alist
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; hash-table-copy
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; hash-table-merge!
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; ;;Hashing
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; hash
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; string-hash
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; string-ci-hash
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; hash-by-identity
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; )
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(import (scheme base)
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(scheme char)
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(scheme complex)
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;(scheme cyclone util)
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)
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; (begin
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(define *default-bound* (- (expt 2 29) 3))
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(define (%string-hash s ch-conv bound)
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(let ((hash 31)
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(len (string-length s)))
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(do ((index 0 (+ index 1)))
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((>= index len) (modulo hash bound))
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(set! hash (modulo (+ (* 37 hash)
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(char->integer (ch-conv (string-ref s index))))
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*default-bound*)))))
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(define (string-hash s . maybe-bound)
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(let ((bound (if (null? maybe-bound) *default-bound* (car maybe-bound))))
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(%string-hash s (lambda (x) x) bound)))
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(define (string-ci-hash s . maybe-bound)
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(let ((bound (if (null? maybe-bound) *default-bound* (car maybe-bound))))
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(%string-hash s char-downcase bound)))
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(define (symbol-hash s . maybe-bound)
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(let ((bound (if (null? maybe-bound) *default-bound* (car maybe-bound))))
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(%string-hash (symbol->string s) (lambda (x) x) bound)))
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(define (hash obj . maybe-bound)
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(let ((bound (if (null? maybe-bound) *default-bound* (car maybe-bound))))
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(cond ((integer? obj) (modulo obj bound))
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((string? obj) (string-hash obj bound))
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((symbol? obj) (symbol-hash obj bound))
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((real? obj) (modulo (+ (numerator obj) (denominator obj)) bound))
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((number? obj)
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(modulo (+ (hash (real-part obj)) (* 3 (hash (imag-part obj))))
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bound))
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((char? obj) (modulo (char->integer obj) bound))
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((vector? obj) (vector-hash obj bound))
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((pair? obj) (modulo (+ (hash (car obj)) (* 3 (hash (cdr obj))))
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bound))
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((null? obj) 0)
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((not obj) 0)
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((procedure? obj) (error "hash: procedures cannot be hashed" obj))
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(else 1))))
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(define hash-by-identity hash)
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(define (vector-hash v bound)
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(let ((hashvalue 571)
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(len (vector-length v)))
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(do ((index 0 (+ index 1)))
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((>= index len) (modulo hashvalue bound))
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(set! hashvalue (modulo (+ (* 257 hashvalue) (hash (vector-ref v index)))
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*default-bound*)))))
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(define %make-hash-node cons)
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(define %hash-node-set-value! set-cdr!)
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(define %hash-node-key car)
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(define %hash-node-value cdr)
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(define-record-type <srfi-hash-table>
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(%make-hash-table size hash compare associate entries)
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hash-table?
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(size hash-table-size hash-table-set-size!)
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(hash hash-table-hash-function)
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(compare hash-table-equivalence-function)
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(associate hash-table-association-function)
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(entries hash-table-entries hash-table-set-entries!))
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(define *default-table-size* 64)
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(define (appropriate-hash-function-for comparison)
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(or (and (eq? comparison eq?) hash-by-identity)
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(and (eq? comparison string=?) string-hash)
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(and (eq? comparison string-ci=?) string-ci-hash)
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hash))
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(define (make-hash-table . args)
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(let* ((comparison (if (null? args) equal? (car args)))
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(hash
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(if (or (null? args) (null? (cdr args)))
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(appropriate-hash-function-for comparison) (cadr args)))
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(size
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(if (or (null? args) (null? (cdr args)) (null? (cddr args)))
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*default-table-size* (caddr args)))
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(association
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(or (and (eq? comparison eq?) assq)
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(and (eq? comparison eqv?) assv)
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(and (eq? comparison equal?) assoc)
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(letrec
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((associate
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(lambda (val alist)
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(cond ((null? alist) #f)
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((comparison val (caar alist)) (car alist))
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(else (associate val (cdr alist)))))))
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associate))))
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(%make-hash-table 0 hash comparison association (make-vector size '()))))
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(define (make-hash-table-maker comp hash)
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(lambda args (apply make-hash-table (cons comp (cons hash args)))))
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(define make-symbol-hash-table
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(make-hash-table-maker eq? symbol-hash))
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(define make-string-hash-table
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(make-hash-table-maker string=? string-hash))
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(define make-string-ci-hash-table
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(make-hash-table-maker string-ci=? string-ci-hash))
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(define make-integer-hash-table
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(make-hash-table-maker = modulo))
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(define (%hash-table-hash hash-table key)
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((hash-table-hash-function hash-table)
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key (vector-length (hash-table-entries hash-table))))
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(define (%hash-table-find entries associate hash key)
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(associate key (vector-ref entries hash)))
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(define (%hash-table-add! entries hash key value)
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(vector-set! entries hash
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(cons (%make-hash-node key value)
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(vector-ref entries hash))))
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(define (%hash-table-delete! entries compare hash key)
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(let ((entrylist (vector-ref entries hash)))
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(cond ((null? entrylist) #f)
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((compare key (caar entrylist))
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(vector-set! entries hash (cdr entrylist)) #t)
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(else
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(let loop ((current (cdr entrylist)) (previous entrylist))
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(cond ((null? current) #f)
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((compare key (caar current))
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(set-cdr! previous (cdr current)) #t)
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(else (loop (cdr current) current))))))))
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(define (%hash-table-walk proc entries)
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(do ((index (- (vector-length entries) 1) (- index 1)))
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((< index 0)) (for-each proc (vector-ref entries index))))
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(define (%hash-table-maybe-resize! hash-table)
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(let* ((old-entries (hash-table-entries hash-table))
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(hash-length (vector-length old-entries)))
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(if (> (hash-table-size hash-table) hash-length)
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(let* ((new-length (* 2 hash-length))
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(new-entries (make-vector new-length '()))
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(hash (hash-table-hash-function hash-table)))
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(%hash-table-walk
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(lambda (node)
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(%hash-table-add! new-entries
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(hash (%hash-node-key node) new-length)
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(%hash-node-key node) (%hash-node-value node)))
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old-entries)
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(hash-table-set-entries! hash-table new-entries)))))
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(define (hash-table-ref hash-table key . maybe-default)
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(cond ((%hash-table-find (hash-table-entries hash-table)
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(hash-table-association-function hash-table)
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(%hash-table-hash hash-table key) key)
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=> %hash-node-value)
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((null? maybe-default)
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(error "hash-table-ref: no value associated with" key))
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(else ((car maybe-default)))))
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(define (hash-table-ref/default hash-table key default)
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(hash-table-ref hash-table key (lambda () default)))
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(define (hash-table-set! hash-table key value)
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(let ((hash (%hash-table-hash hash-table key))
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(entries (hash-table-entries hash-table)))
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(cond ((%hash-table-find entries
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(hash-table-association-function hash-table)
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hash key)
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=> (lambda (node) (%hash-node-set-value! node value)))
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(else (%hash-table-add! entries hash key value)
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(hash-table-set-size! hash-table
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(+ 1 (hash-table-size hash-table)))
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(%hash-table-maybe-resize! hash-table)))))
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(define (hash-table-update! hash-table key function . maybe-default)
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(let ((hash (%hash-table-hash hash-table key))
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(entries (hash-table-entries hash-table)))
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(cond ((%hash-table-find entries
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(hash-table-association-function hash-table)
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hash key)
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=> (lambda (node)
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(%hash-node-set-value!
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node (function (%hash-node-value node)))))
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((null? maybe-default)
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(error "hash-table-update!: no value exists for key" key))
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(else (%hash-table-add! entries hash key
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(function ((car maybe-default))))
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(hash-table-set-size! hash-table
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(+ 1 (hash-table-size hash-table)))
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(%hash-table-maybe-resize! hash-table)))))
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(define (hash-table-update!/default hash-table key function default)
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(hash-table-update! hash-table key function (lambda () default)))
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(define (hash-table-delete! hash-table key)
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(if (%hash-table-delete! (hash-table-entries hash-table)
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(hash-table-equivalence-function hash-table)
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(%hash-table-hash hash-table key) key)
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(hash-table-set-size! hash-table (- (hash-table-size hash-table) 1))))
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(define (hash-table-exists? hash-table key)
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(and (%hash-table-find (hash-table-entries hash-table)
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(hash-table-association-function hash-table)
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(%hash-table-hash hash-table key) key) #t))
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(define (hash-table-walk hash-table proc)
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(%hash-table-walk
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(lambda (node) (proc (%hash-node-key node) (%hash-node-value node)))
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(hash-table-entries hash-table)))
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(define (hash-table-fold hash-table f acc)
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(hash-table-walk hash-table
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(lambda (key value) (set! acc (f key value acc))))
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acc)
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(define (alist->hash-table alist . args)
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(let* ((comparison (if (null? args) equal? (car args)))
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(hash
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(if (or (null? args) (null? (cdr args)))
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(appropriate-hash-function-for comparison) (cadr args)))
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(size
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(if (or (null? args) (null? (cdr args)) (null? (cddr args)))
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(max *default-table-size* (* 2 (length alist))) (caddr args)))
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(hash-table (make-hash-table comparison hash size)))
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(for-each
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(lambda (elem)
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(hash-table-update!/default
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hash-table (car elem) (lambda (x) x) (cdr elem)))
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alist)
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hash-table))
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(define (hash-table->alist hash-table)
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(hash-table-fold hash-table
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(lambda (key val acc) (cons (cons key val) acc)) '()))
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(define (hash-table-copy hash-table)
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(let ((new (make-hash-table (hash-table-equivalence-function hash-table)
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(hash-table-hash-function hash-table)
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(max *default-table-size*
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(* 2 (hash-table-size hash-table))))))
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(hash-table-walk hash-table
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(lambda (key value) (hash-table-set! new key value)))
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new))
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(define (hash-table-merge! hash-table1 hash-table2)
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(hash-table-walk
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hash-table2
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(lambda (key value) (hash-table-set! hash-table1 key value)))
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hash-table1)
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(define (hash-table-keys hash-table)
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(hash-table-fold hash-table (lambda (key val acc) (cons key acc)) '()))
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(define (hash-table-values hash-table)
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(hash-table-fold hash-table (lambda (key val acc) (cons val acc)) '()))
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;))
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