| author |
Steve Losh <steve@stevelosh.com> |
| date |
Tue, 23 Aug 2016 01:23:06 +0000 |
| parents |
4bb629601097 |
| children |
0221e1d8de22 |
# Documentation for `cl-losh`
This library is my own personal utility belt.
Everything I write in here is MIT/X11 licensed, so you're free to use it if
you want. But I make no guarantees about backwards compatibility -- I might
change and break things at any time. Use this at your own risk.
[TOC]
## Package `LOSH`
This package exports all of the symbols in the other packages.
If you just want to get everything you can `:use` this one and be done with
it. Otherwise you can `:use` only the ones you need.
## Package `LOSH.ARRAYS`
Utilities related to arrays.
### `DO-ARRAY` (macro)
(DO-ARRAY (VALUE ARRAY)
&BODY
BODY)
Perform `body` once for each element in `array` using `value` for the place.
`array` can be multidimensional.
`value` will be `symbol-macrolet`ed to the appropriate `aref`, so you can use
it as a place if you want.
Returns the array.
Example:
(let ((arr (vector 1 2 3)))
(do-array (x arr)
(setf x (1+ x))))
=> #(2 3 4)
### `FILL-MULTIDIMENSIONAL-ARRAY` (function)
(FILL-MULTIDIMENSIONAL-ARRAY ARRAY ITEM)
Fill `array` with `item`.
Unlike `fill`, this works on multidimensional arrays. It won't cons on SBCL,
but it may in other implementations.
### `FILL-MULTIDIMENSIONAL-ARRAY-FIXNUM` (function)
(FILL-MULTIDIMENSIONAL-ARRAY-FIXNUM ARRAY ITEM)
Fill `array` (which must be of type `(array FIXNUM *)`) with `item`.
Unlike `fill`, this works on multidimensional arrays. It won't cons on SBCL,
but it may in other implementations.
### `FILL-MULTIDIMENSIONAL-ARRAY-SINGLE-FLOAT` (function)
(FILL-MULTIDIMENSIONAL-ARRAY-SINGLE-FLOAT ARRAY ITEM)
Fill `array` (which must be of type `(array SINGLE-FLOAT *)`) with `item`.
Unlike `fill`, this works on multidimensional arrays. It won't cons on SBCL,
but it may in other implementations.
### `FILL-MULTIDIMENSIONAL-ARRAY-T` (function)
(FILL-MULTIDIMENSIONAL-ARRAY-T ARRAY ITEM)
Fill `array` (which must be of type `(array T *)`) with `item`.
Unlike `fill`, this works on multidimensional arrays. It won't cons on SBCL,
but it may in other implementations.
## Package `LOSH.CONTROL-FLOW`
Utilities for managing control flow.
### `GATHERING` (macro)
(GATHERING
&BODY
BODY)
Run `body` to gather some things and return them.
`body` will be executed with the symbol `gather` bound to a function of one
argument. Once `body` has finished, a list of everything `gather` was called
on will be returned.
It's handy for pulling results out of code that executes procedurally and
doesn't return anything, like `maphash` or Alexandria's `map-permutations`.
The `gather` function can be passed to other functions, but should not be
retained once the `gathering` form has returned (it would be useless to do so
anyway).
Examples:
(gathering
(dotimes (i 5)
(gather i))
=>
(0 1 2 3 4)
(gathering
(mapc #'gather '(1 2 3))
(mapc #'gather '(a b)))
=>
(1 2 3 a b)
### `IF-FOUND` (macro)
(IF-FOUND VAR LOOKUP-EXPR THEN ELSE)
Perform `then` or `else` depending on the results of `lookup-expr`.
`lookup-expr` should be an expression that returns two values, the first being
the result and the second indicating whether the lookup was successful. The
standard `gethash` is an example of a function that behaves like this.
If the lookup was successful, `then` will be executed with `var` bound to the
result, and its value returned.
Otherwise `else` will be executed and returned, without any extra bindings.
Example:
(multiple-value-bind (val found) (gethash :foo hash)
(if found
'yes
'no))
; becomes
(if-found val (gethash :foo hash)
'yes
'no)
### `RECURSIVELY` (macro)
(RECURSIVELY BINDINGS
&BODY
BODY)
Execute `body` recursively, like Clojure's `loop`/`recur`.
`bindings` should contain a list of symbols and (optional) starting values.
In `body` the symbol `recur` will be bound to the function for recurring.
This macro doesn't perform an explicit tail-recursion check like Clojure's
`loop`. You know what you're doing, right?
Example:
(defun length (some-list)
(recursively ((list some-list)
(n 0))
(if (null list)
n
(recur (cdr list) (1+ n)))))
### `WHEN-FOUND` (macro)
(WHEN-FOUND VAR
LOOKUP-EXPR
&BODY
BODY)
Perform `body` with `var` to the results of `lookup-expr`, when valid.
`lookup-expr` should be an expression that returns two values, the first being
the result (which will be bound to `var`) and the second indicating whether
the lookup was successful. The standard `gethash` is an example of a function
that behaves like this.
If the lookup was successful, `body` will be executed and its value returned.
Example:
(multiple-value-bind (val found) (gethash :foo hash)
(when found
body))
; becomes
(when-found val (gethash :foo hash)
body)
## Package `LOSH.DEBUGGING`
Utilities for figuring out what the hell is going on.
### `BITS` (function)
(BITS N SIZE &OPTIONAL (STREAM T))
Print the bits of the `size`-bit two's complement integer `n` to `stream`.
Examples:
(bits 5 10)
=> 0000000101
(bits -5 10)
=> 1111111011
### `DIS` (macro)
(DIS ARGLIST
&BODY
BODY)
Disassemble the code generated for a `lambda` with `arglist` and `body`.
It will also spew compiler notes so you can see why the garbage box isn't
doing what you think it should be doing.
### `PR` (function)
(PR &REST ARGS)
Print `args` readably, separated by spaces and followed by a newline.
This is what `print` should have been.
## Package `LOSH.DISTRIBUTIONS`
Utilities for calculating statistical... things.
### `FREQUENCIES` (function)
(FREQUENCIES SEQ &KEY (TEST 'EQL))
Return a hash table containing the frequencies of the items in `seq`.
Uses `test` for the `:test` of the hash table.
Example:
(frequencies '(foo foo bar))
=> {foo 2
bar 1}
### `PREFIX-SUMS` (function)
(PREFIX-SUMS LIST)
Return a list of the prefix sums of the numbers in `list`.
Example:
(prefix-sums '(10 10 10 0 1))
=> (10 20 30 30 31)
## Package `LOSH.ELDRITCH-HORRORS`
Abandon all hope, ye who enter here.
### `DEFINE-WITH-MACRO` (macro)
(DEFINE-WITH-MACRO TYPE &REST SLOTS)
Define a with-`type` macro for the given `type` and `slots`.
This new macro wraps `with-accessors` so you don't have to type `type-`
a billion times.
The given `type` must be a symbol naming a struct or class. It must have the
appropriate accessors with names exactly of the form `type`-`slot`.
The defined macro will look something like this:
(define-with-macro foo a b)
=>
(defmacro with-foo ((foo &optional (a-symbol 'a) (b-symbol 'b))
&body body)
`(with-accessors ((,a-symbol foo-a) (,b-symbol foo-b))
,foo
,@body))
There's a lot of magic here, but it cuts down on boilerplate for simple things
quite a lot.
Example:
(defstruct foo x y)
(define-with-macro foo x y)
(defparameter *f* (make-foo :x 10 :y 20))
(defparameter *g* (make-foo :x 555 :y 999))
(with-foo (*f*)
(with-foo (*g* gx gy)
(print (list x y gx gy))))
=>
(10 20 555 999)
### `DLAMBDA` (macro)
(DLAMBDA &REST CLAUSES)
## Package `LOSH.FUNCTIONS`
Utilities for working with higher-order functions.
### `JUXT` (function)
(JUXT &REST FNS)
Return a function that will juxtapose the results of `functions`.
This is like Clojure's `juxt`. Given functions `(f0 f1 ... fn)`, this will
return a new function which, when called with some arguments, will return
`(list (f0 ...args...) (f1 ...args...) ... (fn ...args...))`.
Example:
(funcall (juxt #'list #'+ #'- #'*) 1 2)
=> ((1 2) 3 -1 2)
### `NULLARY` (function)
(NULLARY FUNCTION &OPTIONAL RESULT)
Return a new function that acts as a nullary-patched version of `function`.
The new function will return `result` when called with zero arguments, and
delegate to `function` otherwise.
Examples:
(max 1 10 2) => 10
(max) => invalid number of arguments
(funcall (nullary #'max)) => nil
(funcall (nullary #'max 0)) => 0
(funcall (nullary #'max 0) 1 10 2) => 10
(reduce #'max nil) => invalid number of arguments
(reduce (nullary #'max) nil) => nil
(reduce (nullary #'max :empty) nil) => :empty
(reduce (nullary #'max) '(1 10 2)) => 10
## Package `LOSH.HASH-SETS`
A simple hash set implementation.
### `HASH-SET` (class)
#### Slot `DATA`
* Allocation: `:INSTANCE`
* Initarg: `:DATA`
### `MAKE-SET` (function)
(MAKE-SET &KEY (TEST #'EQL) (INITIAL-DATA NIL))
### `SET-ADD` (function)
(SET-ADD SET VALUE)
### `SET-ADD-ALL` (function)
(SET-ADD-ALL SET SEQ)
### `SET-CLEAR` (function)
(SET-CLEAR SET)
### `SET-CONTAINS-P` (function)
(SET-CONTAINS-P SET VALUE)
### `SET-EMPTY-P` (function)
(SET-EMPTY-P SET)
### `SET-POP` (function)
(SET-POP SET)
### `SET-RANDOM` (function)
(SET-RANDOM SET)
### `SET-REMOVE` (function)
(SET-REMOVE SET VALUE)
### `SET-REMOVE-ALL` (function)
(SET-REMOVE-ALL SET SEQ)
## Package `LOSH.ITERATE`
Custom `iterate` drivers and clauses.
## Package `LOSH.LISTS`
Utilities related to lists.
### `TAKE` (function)
(TAKE N LIST)
Return a fresh list of the first `n` elements of `list`.
If `list` is shorter than `n` a shorter result will be returned.
Example:
(take 2 '(a b c))
=> (a b)
(take 4 '(1))
=> (1)
## Package `LOSH.MATH`
Utilities related to math and numbers.
### `CLAMP` (function)
(CLAMP FROM TO VALUE)
Clamp `value` between `from` and `to`.
### `DIVIDESP` (function)
(DIVIDESP N DIVISOR)
Return whether `n` is evenly divisible by `divisor`.
### `LERP` (function)
(LERP FROM TO N)
Lerp together `from` and `to` by factor `n`.
Note that you might want `precise-lerp` instead.
### `MAP-RANGE` (function)
(MAP-RANGE SOURCE-FROM SOURCE-TO DEST-FROM DEST-TO SOURCE-VAL)
Map `source-val` from the source range to the destination range.
Example:
; source dest value
(map-range 0.0 1.0 10.0 20.0 0.2)
=> 12.0
### `NORM` (function)
(NORM MIN MAX VAL)
Normalize `val` to a number between `0` and `1` (maybe).
If `val` is between `max` and `min`, the result will be a number between `0`
and `1`.
If `val` lies outside of the range, it'll be still be scaled and will end up
outside the 0/1 range.
### `PRECISE-LERP` (function)
(PRECISE-LERP FROM TO N)
Lerp together `from` and `to` by factor `n`, precisely.
Vanilla lerp does not guarantee `(lerp from to 0.0)` will return exactly
`from` due to floating-point errors. This version will return exactly `from`
when given a `n` of `0.0`, at the cost of an extra multiplication.
### `SQUARE` (function)
(SQUARE X)
### `TAU` (variable)
## Package `LOSH.MUTATION`
Utilities for mutating places in-place.
### `CALLF` (macro)
(CALLF &REST PLACE-FUNCTION-PAIRS)
Set each `place` to the result of calling `function` on its current value.
Examples:
(let ((x 10) (y 20))
(callf x #'1-
y #'1+)
(list x y))
=>
(9 21)
### `CLAMPF` (macro)
(CLAMPF PLACE FROM TO)
Clamp `place` between `from` and `to` in-place.
### `DIVF` (macro)
(DIVF PLACE &OPTIONAL DIVISOR)
Divide `place` by `divisor` in-place.
If `divisor` is not given, `place` will be set to `(/ 1 place)`.
### `MODF` (macro)
(MODF PLACE DIVISOR)
Modulo `place` by `divisor` in-place.
### `MULF` (macro)
(MULF PLACE FACTOR)
Multiply `place` by `factor` in-place.
### `NEGATEF` (macro)
(NEGATEF PLACE)
Negate the value of `place`.
### `NOTF` (macro)
(NOTF PLACE)
Set `place` to `(not place)` in-place.
### `REMAINDERF` (macro)
(REMAINDERF PLACE DIVISOR)
Remainder `place` by `divisor` in-place.
### `ZAPF` (macro)
(ZAPF &REST PLACE-EXPR-PAIRS)
Update each `place` by evaluating `expr` with `%` bound to the current value.
`zapf` works like `setf`, but when evaluating the value expressions the symbol
`%` will be bound to the current value of the place.
Examples:
(zapf foo (1+ %)
(car bar) (if (> % 10) :a :b))
## Package `LOSH.QUEUES`
A simple queue implementation.
### `DEQUEUE` (function)
(DEQUEUE QUEUE)
Dequeue an item from `queue` and return it.
### `ENQUEUE` (function)
(ENQUEUE ITEM QUEUE)
Enqueue `item` in `queue`, returning the new size of the queue.
### `MAKE-QUEUE` (function)
(MAKE-QUEUE)
Allocate and return a fresh queue.
### `QUEUE` (struct)
Slots: `CONTENTS`, `LAST`, `SIZE`
### `QUEUE-APPEND` (function)
(QUEUE-APPEND QUEUE LIST)
Enqueue each element of `list` in `queue` and return the queue's final size.
### `QUEUE-CONTENTS` (function)
(QUEUE-CONTENTS VALUE INSTANCE)
### `QUEUE-EMPTY-P` (function)
(QUEUE-EMPTY-P QUEUE)
Return whether `queue` is empty.
### `QUEUE-SIZE` (function)
(QUEUE-SIZE VALUE INSTANCE)
## Package `LOSH.RANDOM`
Utilities related to randomness.
### `D` (function)
(D N SIDES &OPTIONAL (PLUS 0))
Roll some dice.
Examples:
(d 1 4) ; rolls 1d4
(d 2 8) ; rolls 2d8
(d 1 10 -1) ; rolls 1d10-1
### `RANDOM-AROUND` (function)
(RANDOM-AROUND VALUE SPREAD)
Return a random number within `spread` of `value`.
### `RANDOM-ELT` (function)
(RANDOM-ELT SEQ)
Return a random element of `seq`, and whether one was available.
This will NOT be efficient for lists.
Examples:
(random-elt #(1 2 3))
=> 1
T
(random-elt nil)
=> nil
nil
### `RANDOM-GAUSSIAN` (function)
(RANDOM-GAUSSIAN &OPTIONAL (MEAN 0.0) (STANDARD-DEVIATION 1.0))
Return a random float from a gaussian distribution. NOT THREAD-SAFE (yet)!
### `RANDOM-GAUSSIAN-INTEGER` (function)
(RANDOM-GAUSSIAN-INTEGER &OPTIONAL (MEAN 0) (STANDARD-DEVIATION 1))
Return a random integer from a gaussian distribution. NOT THREAD-SAFE (yet)!
### `RANDOM-RANGE` (function)
(RANDOM-RANGE MIN MAX)
Return a random number between [`min`, `max`).
### `RANDOM-RANGE-EXCLUSIVE` (function)
(RANDOM-RANGE-EXCLUSIVE MIN MAX)
Return a random number between (`min`, `max`).
### `RANDOMP` (function)
(RANDOMP &OPTIONAL (CHANCE 0.5))
Return a random boolean with `chance` probability of `t`.
## Package `LOSH.WEIGHTLISTS`
A simple data structure for choosing random items with weighted probabilities.
### `MAKE-WEIGHTLIST` (function)
(MAKE-WEIGHTLIST ITEMS WEIGHTS)
Make a weightlist of the given items and weights.
Weights can be any `real` numbers. Weights of zero are fine, as long as at
least one of the weights is nonzero (otherwise there's nothing to choose).
### `WEIGHTLIST` (struct)
Slots: `WEIGHTS`, `SUMS`, `ITEMS`, `TOTAL`
### `WEIGHTLIST-ITEMS` (function)
(WEIGHTLIST-ITEMS VALUE INSTANCE)
### `WEIGHTLIST-RANDOM` (function)
(WEIGHTLIST-RANDOM WEIGHTLIST)
Return a random item from the weightlist, taking the weights into account.
### `WEIGHTLIST-WEIGHTS` (function)
(WEIGHTLIST-WEIGHTS VALUE INSTANCE)