| author |
Steve Losh <steve@stevelosh.com> |
| date |
Tue, 07 Feb 2017 12:29:12 +0000 |
| parents |
4843f09b50f6 |
| children |
fd5861c11c5f |
;;;; This file was automatically generated by Quickutil.
;;;; See http://quickutil.org for details.
;;;; To regenerate:
;;;; (qtlc:save-utils-as "quickutils.lisp" :utilities '(:COMPOSE :COPY-HASH-TABLE :CURRY :ENSURE-BOOLEAN :ENSURE-GETHASH :ENSURE-LIST :EXTREMUM :FLATTEN-ONCE :HASH-TABLE-ALIST :HASH-TABLE-KEYS :HASH-TABLE-VALUES :MAP-PRODUCT :MAP-TREE :MKSTR :ONCE-ONLY :RCURRY :SET-EQUAL :SUBDIVIDE :SYMB :WITH-GENSYMS :WITH-OUTPUT-TO-FILE :WRITE-STRING-INTO-FILE :YES-NO) :ensure-package T :package "SCULLY.QUICKUTILS")
(eval-when (:compile-toplevel :load-toplevel :execute)
(unless (find-package "SCULLY.QUICKUTILS")
(defpackage "SCULLY.QUICKUTILS"
(:documentation "Package that contains Quickutil utility functions.")
(:use #:cl))))
(in-package "SCULLY.QUICKUTILS")
(when (boundp '*utilities*)
(setf *utilities* (union *utilities* '(:MAKE-GENSYM-LIST :ENSURE-FUNCTION
:COMPOSE :COPY-HASH-TABLE :CURRY
:ENSURE-BOOLEAN :ENSURE-GETHASH
:ENSURE-LIST :EXTREMUM :FLATTEN-ONCE
:HASH-TABLE-ALIST :MAPHASH-KEYS
:HASH-TABLE-KEYS :MAPHASH-VALUES
:HASH-TABLE-VALUES :MAPPEND
:MAP-PRODUCT :MAP-TREE :MKSTR
:ONCE-ONLY :RCURRY :SET-EQUAL
:SUBDIVIDE :SYMB :STRING-DESIGNATOR
:WITH-GENSYMS :WITH-OPEN-FILE*
:WITH-OUTPUT-TO-FILE
:WRITE-STRING-INTO-FILE :YES-NO))))
(eval-when (:compile-toplevel :load-toplevel :execute)
(defun make-gensym-list (length &optional (x "G"))
"Returns a list of `length` gensyms, each generated as if with a call to `make-gensym`,
using the second (optional, defaulting to `\"G\"`) argument."
(let ((g (if (typep x '(integer 0)) x (string x))))
(loop repeat length
collect (gensym g))))
) ; eval-when
(eval-when (:compile-toplevel :load-toplevel :execute)
;;; To propagate return type and allow the compiler to eliminate the IF when
;;; it is known if the argument is function or not.
(declaim (inline ensure-function))
(declaim (ftype (function (t) (values function &optional))
ensure-function))
(defun ensure-function (function-designator)
"Returns the function designated by `function-designator`:
if `function-designator` is a function, it is returned, otherwise
it must be a function name and its `fdefinition` is returned."
(if (functionp function-designator)
function-designator
(fdefinition function-designator)))
) ; eval-when
(defun compose (function &rest more-functions)
"Returns a function composed of `function` and `more-functions` that applies its ;
arguments to to each in turn, starting from the rightmost of `more-functions`,
and then calling the next one with the primary value of the last."
(declare (optimize (speed 3) (safety 1) (debug 1)))
(reduce (lambda (f g)
(let ((f (ensure-function f))
(g (ensure-function g)))
(lambda (&rest arguments)
(declare (dynamic-extent arguments))
(funcall f (apply g arguments)))))
more-functions
:initial-value function))
(define-compiler-macro compose (function &rest more-functions)
(labels ((compose-1 (funs)
(if (cdr funs)
`(funcall ,(car funs) ,(compose-1 (cdr funs)))
`(apply ,(car funs) arguments))))
(let* ((args (cons function more-functions))
(funs (make-gensym-list (length args) "COMPOSE")))
`(let ,(loop for f in funs for arg in args
collect `(,f (ensure-function ,arg)))
(declare (optimize (speed 3) (safety 1) (debug 1)))
(lambda (&rest arguments)
(declare (dynamic-extent arguments))
,(compose-1 funs))))))
(defun copy-hash-table (table &key key test size
rehash-size rehash-threshold)
"Returns a copy of hash table `table`, with the same keys and values
as the `table`. The copy has the same properties as the original, unless
overridden by the keyword arguments.
Before each of the original values is set into the new hash-table, `key`
is invoked on the value. As `key` defaults to `cl:identity`, a shallow
copy is returned by default."
(setf key (or key 'identity))
(setf test (or test (hash-table-test table)))
(setf size (or size (hash-table-size table)))
(setf rehash-size (or rehash-size (hash-table-rehash-size table)))
(setf rehash-threshold (or rehash-threshold (hash-table-rehash-threshold table)))
(let ((copy (make-hash-table :test test :size size
:rehash-size rehash-size
:rehash-threshold rehash-threshold)))
(maphash (lambda (k v)
(setf (gethash k copy) (funcall key v)))
table)
copy))
(defun curry (function &rest arguments)
"Returns a function that applies `arguments` and the arguments
it is called with to `function`."
(declare (optimize (speed 3) (safety 1) (debug 1)))
(let ((fn (ensure-function function)))
(lambda (&rest more)
(declare (dynamic-extent more))
;; Using M-V-C we don't need to append the arguments.
(multiple-value-call fn (values-list arguments) (values-list more)))))
(define-compiler-macro curry (function &rest arguments)
(let ((curries (make-gensym-list (length arguments) "CURRY"))
(fun (gensym "FUN")))
`(let ((,fun (ensure-function ,function))
,@(mapcar #'list curries arguments))
(declare (optimize (speed 3) (safety 1) (debug 1)))
(lambda (&rest more)
(apply ,fun ,@curries more)))))
(defun ensure-boolean (x)
"Convert `x` into a Boolean value."
(and x t))
(defmacro ensure-gethash (key hash-table &optional default)
"Like `gethash`, but if `key` is not found in the `hash-table` saves the `default`
under key before returning it. Secondary return value is true if key was
already in the table."
`(multiple-value-bind (value ok) (gethash ,key ,hash-table)
(if ok
(values value ok)
(values (setf (gethash ,key ,hash-table) ,default) nil))))
(defun ensure-list (list)
"If `list` is a list, it is returned. Otherwise returns the list designated by `list`."
(if (listp list)
list
(list list)))
(defun extremum (sequence predicate &key key (start 0) end)
"Returns the element of `sequence` that would appear first if the subsequence
bounded by `start` and `end` was sorted using `predicate` and `key`.
`extremum` determines the relationship between two elements of `sequence` by using
the `predicate` function. `predicate` should return true if and only if the first
argument is strictly less than the second one (in some appropriate sense). Two
arguments `x` and `y` are considered to be equal if `(funcall predicate x y)`
and `(funcall predicate y x)` are both false.
The arguments to the `predicate` function are computed from elements of `sequence`
using the `key` function, if supplied. If `key` is not supplied or is `nil`, the
sequence element itself is used.
If `sequence` is empty, `nil` is returned."
(let* ((pred-fun (ensure-function predicate))
(key-fun (unless (or (not key) (eq key 'identity) (eq key #'identity))
(ensure-function key)))
(real-end (or end (length sequence))))
(cond ((> real-end start)
(if key-fun
(flet ((reduce-keys (a b)
(if (funcall pred-fun
(funcall key-fun a)
(funcall key-fun b))
a
b)))
(declare (dynamic-extent #'reduce-keys))
(reduce #'reduce-keys sequence :start start :end real-end))
(flet ((reduce-elts (a b)
(if (funcall pred-fun a b)
a
b)))
(declare (dynamic-extent #'reduce-elts))
(reduce #'reduce-elts sequence :start start :end real-end))))
((= real-end start)
nil)
(t
(error "Invalid bounding indexes for sequence of length ~S: ~S ~S, ~S ~S"
(length sequence)
:start start
:end end)))))
(defun flatten-once (list)
"Flatten `list` once."
(loop :for x :in list
:if (listp x)
:append x
:else
:collect x))
(defun hash-table-alist (table)
"Returns an association list containing the keys and values of hash table
`table`."
(let ((alist nil))
(maphash (lambda (k v)
(push (cons k v) alist))
table)
alist))
(declaim (inline maphash-keys))
(defun maphash-keys (function table)
"Like `maphash`, but calls `function` with each key in the hash table `table`."
(maphash (lambda (k v)
(declare (ignore v))
(funcall function k))
table))
(defun hash-table-keys (table)
"Returns a list containing the keys of hash table `table`."
(let ((keys nil))
(maphash-keys (lambda (k)
(push k keys))
table)
keys))
(declaim (inline maphash-values))
(defun maphash-values (function table)
"Like `maphash`, but calls `function` with each value in the hash table `table`."
(maphash (lambda (k v)
(declare (ignore k))
(funcall function v))
table))
(defun hash-table-values (table)
"Returns a list containing the values of hash table `table`."
(let ((values nil))
(maphash-values (lambda (v)
(push v values))
table)
values))
(defun mappend (function &rest lists)
"Applies `function` to respective element(s) of each `list`, appending all the
all the result list to a single list. `function` must return a list."
(loop for results in (apply #'mapcar function lists)
append results))
(defun map-product (function list &rest more-lists)
"Returns a list containing the results of calling `function` with one argument
from `list`, and one from each of `more-lists` for each combination of arguments.
In other words, returns the product of `list` and `more-lists` using `function`.
Example:
(map-product 'list '(1 2) '(3 4) '(5 6))
=> ((1 3 5) (1 3 6) (1 4 5) (1 4 6)
(2 3 5) (2 3 6) (2 4 5) (2 4 6))"
(labels ((%map-product (f lists)
(let ((more (cdr lists))
(one (car lists)))
(if (not more)
(mapcar f one)
(mappend (lambda (x)
(%map-product (curry f x) more))
one)))))
(%map-product (ensure-function function) (cons list more-lists))))
(defun map-tree (function tree)
"Map `function` to each of the leave of `tree`."
(check-type tree cons)
(labels ((rec (tree)
(cond
((null tree) nil)
((atom tree) (funcall function tree))
((consp tree)
(cons (rec (car tree))
(rec (cdr tree)))))))
(rec tree)))
(defun mkstr (&rest args)
"Receives any number of objects (string, symbol, keyword, char, number), extracts all printed representations, and concatenates them all into one string.
Extracted from _On Lisp_, chapter 4."
(with-output-to-string (s)
(dolist (a args) (princ a s))))
(defmacro once-only (specs &body forms)
"Evaluates `forms` with symbols specified in `specs` rebound to temporary
variables, ensuring that each initform is evaluated only once.
Each of `specs` must either be a symbol naming the variable to be rebound, or of
the form:
(symbol initform)
Bare symbols in `specs` are equivalent to
(symbol symbol)
Example:
(defmacro cons1 (x) (once-only (x) `(cons ,x ,x)))
(let ((y 0)) (cons1 (incf y))) => (1 . 1)"
(let ((gensyms (make-gensym-list (length specs) "ONCE-ONLY"))
(names-and-forms (mapcar (lambda (spec)
(etypecase spec
(list
(destructuring-bind (name form) spec
(cons name form)))
(symbol
(cons spec spec))))
specs)))
;; bind in user-macro
`(let ,(mapcar (lambda (g n) (list g `(gensym ,(string (car n)))))
gensyms names-and-forms)
;; bind in final expansion
`(let (,,@(mapcar (lambda (g n)
``(,,g ,,(cdr n)))
gensyms names-and-forms))
;; bind in user-macro
,(let ,(mapcar (lambda (n g) (list (car n) g))
names-and-forms gensyms)
,@forms)))))
(defun rcurry (function &rest arguments)
"Returns a function that applies the arguments it is called
with and `arguments` to `function`."
(declare (optimize (speed 3) (safety 1) (debug 1)))
(let ((fn (ensure-function function)))
(lambda (&rest more)
(declare (dynamic-extent more))
(multiple-value-call fn (values-list more) (values-list arguments)))))
(defun set-equal (list1 list2 &key (test #'eql) (key nil keyp))
"Returns true if every element of `list1` matches some element of `list2` and
every element of `list2` matches some element of `list1`. Otherwise returns false."
(let ((keylist1 (if keyp (mapcar key list1) list1))
(keylist2 (if keyp (mapcar key list2) list2)))
(and (dolist (elt keylist1 t)
(or (member elt keylist2 :test test)
(return nil)))
(dolist (elt keylist2 t)
(or (member elt keylist1 :test test)
(return nil))))))
(defun subdivide (sequence chunk-size)
"Split `sequence` into subsequences of size `chunk-size`."
(check-type sequence sequence)
(check-type chunk-size (integer 1))
(etypecase sequence
;; Since lists have O(N) access time, we iterate through manually,
;; collecting each chunk as we pass through it. Using SUBSEQ would
;; be O(N^2).
(list (loop :while sequence
:collect
(loop :repeat chunk-size
:while sequence
:collect (pop sequence))))
;; For other sequences like strings or arrays, we can simply chunk
;; by repeated SUBSEQs.
(sequence (loop :with len := (length sequence)
:for i :below len :by chunk-size
:collect (subseq sequence i (min len (+ chunk-size i)))))))
(defun symb (&rest args)
"Receives any number of objects, concatenates all into one string with `#'mkstr` and converts them to symbol.
Extracted from _On Lisp_, chapter 4.
See also: `symbolicate`"
(values (intern (apply #'mkstr args))))
(deftype string-designator ()
"A string designator type. A string designator is either a string, a symbol,
or a character."
`(or symbol string character))
(defmacro with-gensyms (names &body forms)
"Binds each variable named by a symbol in `names` to a unique symbol around
`forms`. Each of `names` must either be either a symbol, or of the form:
(symbol string-designator)
Bare symbols appearing in `names` are equivalent to:
(symbol symbol)
The string-designator is used as the argument to `gensym` when constructing the
unique symbol the named variable will be bound to."
`(let ,(mapcar (lambda (name)
(multiple-value-bind (symbol string)
(etypecase name
(symbol
(values name (symbol-name name)))
((cons symbol (cons string-designator null))
(values (first name) (string (second name)))))
`(,symbol (gensym ,string))))
names)
,@forms))
(defmacro with-unique-names (names &body forms)
"Binds each variable named by a symbol in `names` to a unique symbol around
`forms`. Each of `names` must either be either a symbol, or of the form:
(symbol string-designator)
Bare symbols appearing in `names` are equivalent to:
(symbol symbol)
The string-designator is used as the argument to `gensym` when constructing the
unique symbol the named variable will be bound to."
`(with-gensyms ,names ,@forms))
(defmacro with-open-file* ((stream filespec &key direction element-type
if-exists if-does-not-exist external-format)
&body body)
"Just like `with-open-file`, but `nil` values in the keyword arguments mean to use
the default value specified for `open`."
(once-only (direction element-type if-exists if-does-not-exist external-format)
`(with-open-stream
(,stream (apply #'open ,filespec
(append
(when ,direction
(list :direction ,direction))
(when ,element-type
(list :element-type ,element-type))
(when ,if-exists
(list :if-exists ,if-exists))
(when ,if-does-not-exist
(list :if-does-not-exist ,if-does-not-exist))
(when ,external-format
(list :external-format ,external-format)))))
,@body)))
(defmacro with-output-to-file ((stream-name file-name &rest args
&key (direction nil direction-p)
&allow-other-keys)
&body body)
"Evaluate `body` with `stream-name` to an output stream on the file
`file-name`. `args` is sent as is to the call to `open` except `external-format`,
which is only sent to `with-open-file` when it's not `nil`."
(declare (ignore direction))
(when direction-p
(error "Can't specifiy :DIRECTION for WITH-OUTPUT-TO-FILE."))
`(with-open-file* (,stream-name ,file-name :direction :output ,@args)
,@body))
(defun write-string-into-file (string pathname &key (if-exists :error)
if-does-not-exist
external-format)
"Write `string` to `pathname`.
The `external-format` parameter will be passed directly to `with-open-file`
unless it's `nil`, which means the system default."
(with-output-to-file (file-stream pathname :if-exists if-exists
:if-does-not-exist if-does-not-exist
:external-format external-format)
(write-sequence string file-stream)))
(defun yes (&rest ignored)
(declare (ignore ignored))
t)
(defun no (&rest ignored)
(declare (ignore ignored))
nil)
(eval-when (:compile-toplevel :load-toplevel :execute)
(export '(compose copy-hash-table curry ensure-boolean ensure-gethash
ensure-list extremum flatten-once hash-table-alist hash-table-keys
hash-table-values map-product map-tree mkstr once-only rcurry
set-equal subdivide symb with-gensyms with-unique-names
with-output-to-file write-string-into-file yes no)))
;;;; END OF quickutils.lisp ;;;;