| author |
Steve Losh <steve@stevelosh.com> |
| date |
Mon, 16 Jan 2017 22:39:22 +0000 |
| parents |
f088d1a1afd6 |
| children |
824673714b91 |
;;;; This file was automatically generated by Quickutil.
;;;; See http://quickutil.org for details.
;;;; To regenerate:
;;;; (qtlc:save-utils-as "quickutils.lisp" :utilities '(:CURRY :ENSURE-BOOLEAN :ENSURE-GETHASH :ENSURE-LIST :N-GRAMS :ONCE-ONLY :RCURRY :READ-FILE-INTO-STRING :WITH-GENSYMS) :ensure-package T :package "MAGITEK.QUICKUTILS")
(eval-when (:compile-toplevel :load-toplevel :execute)
(unless (find-package "MAGITEK.QUICKUTILS")
(defpackage "MAGITEK.QUICKUTILS"
(:documentation "Package that contains Quickutil utility functions.")
(:use #:cl))))
(in-package "MAGITEK.QUICKUTILS")
(when (boundp '*utilities*)
(setf *utilities* (union *utilities* '(:MAKE-GENSYM-LIST :ENSURE-FUNCTION
:CURRY :ENSURE-BOOLEAN :ENSURE-GETHASH
:ENSURE-LIST :TAKE :N-GRAMS :ONCE-ONLY
:RCURRY :WITH-OPEN-FILE*
:WITH-INPUT-FROM-FILE
:READ-FILE-INTO-STRING
:STRING-DESIGNATOR :WITH-GENSYMS))))
(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 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 take (n sequence)
"Take the first `n` elements from `sequence`."
(subseq sequence 0 n))
(defun n-grams (n sequence)
"Find all `n`-grams of the sequence `sequence`."
(assert (and (plusp n)
(<= n (length sequence))))
(etypecase sequence
;; Lists
(list (loop :repeat (1+ (- (length sequence) n))
:for seq :on sequence
:collect (take n seq)))
;; General sequences
(sequence (loop :for i :to (- (length sequence) n)
:collect (subseq sequence i (+ i n))))))
(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)))))
(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-input-from-file ((stream-name file-name &rest args
&key (direction nil direction-p)
&allow-other-keys)
&body body)
"Evaluate `body` with `stream-name` to an input 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-INPUT-FROM-FILE."))
`(with-open-file* (,stream-name ,file-name :direction :input ,@args)
,@body))
(defun read-file-into-string (pathname &key (buffer-size 4096) external-format)
"Return the contents of the file denoted by `pathname` as a fresh string.
The `external-format` parameter will be passed directly to `with-open-file`
unless it's `nil`, which means the system default."
(with-input-from-file
(file-stream pathname :external-format external-format)
(let ((*print-pretty* nil))
(with-output-to-string (datum)
(let ((buffer (make-array buffer-size :element-type 'character)))
(loop
:for bytes-read = (read-sequence buffer file-stream)
:do (write-sequence buffer datum :start 0 :end bytes-read)
:while (= bytes-read buffer-size)))))))
(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))
(eval-when (:compile-toplevel :load-toplevel :execute)
(export '(curry ensure-boolean ensure-gethash ensure-list n-grams once-only
rcurry read-file-into-string with-gensyms with-unique-names)))
;;;; END OF quickutils.lisp ;;;;