From 187225688d7a39e857712dd672d27761b8e0ecd4 Mon Sep 17 00:00:00 2001 From: Matthew Butterick Date: Thu, 24 Jul 2014 18:46:24 -0700 Subject: [PATCH] doc update --- doc/Coercion.html | 2 +- doc/Container.html | 2 +- doc/Debug.html | 3 +++ doc/File.html | 2 ++ doc/Installation___updates.html | 2 +- doc/Len.html | 2 +- doc/License___source_code.html | 2 +- doc/doc-index.html | 2 +- doc/index.html | 2 +- 9 files changed, 12 insertions(+), 7 deletions(-) create mode 100644 doc/Debug.html create mode 100644 doc/File.html diff --git a/doc/Coercion.html b/doc/Coercion.html index 59b9c5a..b8996cf 100644 --- a/doc/Coercion.html +++ b/doc/Coercion.html @@ -1,3 +1,3 @@ -2 Coercion
▼Sugar:   readability & convenience library
►2 Coercion
On this page:
2.1 Values
->int
->string
->symbol
->path
->complete-path
->list
->vector
->boolean
intish?
stringish?
symbolish?
pathish?
complete-pathish?
listish?
vectorish?
2.2 Coercion contracts
coerce/  int?
coerce/  string?
coerce/  symbol?
coerce/  path?
coerce/  boolean?
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2 Coercion

 (require sugar/coerce) package: sugar

Functions that coerce the datatype of a value to another type. Racket already has type-specific conversion functions. But if you’re handling values of indeterminate type — as sometimes happens in an untyped language — then handling the possible cases individually gets to be a drag.

2.1 Values

procedure

(->int v) → integer?

  v : any/c
Convert v to an integer in the least surprising way, or raise an error if no conversion is possible.

Numbers are rounded down to the nearest integer.

Examples:

> (->int 3)

3

> (->int 3.5)

3

> (->int -2.5)

-3

> (->int (+ 3 (/ 1 2)))

3

Stringlike values — paths, symbols, and strings — are converted to numbers and rounded down.

Examples:

> (->int "3.5")

3

> (->int '3.5)

3

> (->int (string->path "3.5"))

3

Characters are directly converted to integers.

Examples:

> (->int #\A)

65

> (->int #\◊)

9674

Lists, vectors, and other multi-value datatypes return their length (using len).

Examples:

> (->int (list 5 6 7))

3

> (->int (hash 'a 1 'b 2 'c 3))

3

The function will raise an error if no sensible conversion is possible. +2 Coercion
▼Sugar:   readability & convenience library
►2 Coercion
On this page:
2.1 Values
->int
->string
->symbol
->path
->complete-path
->list
->vector
->boolean
intish?
stringish?
symbolish?
pathish?
complete-pathish?
listish?
vectorish?
2.2 Coercion contracts
coerce/  int?
coerce/  string?
coerce/  symbol?
coerce/  path?
coerce/  boolean?
6.0.1.13
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2 Coercion

 (require sugar/coerce) package: sugar

Functions that coerce the datatype of a value to another type. Racket already has type-specific conversion functions. But if you’re handling values of indeterminate type — as sometimes happens in an untyped language — then handling the possible cases individually gets to be a drag.

2.1 Values

procedure

(->int v) → integer?

  v : any/c
Convert v to an integer in the least surprising way, or raise an error if no conversion is possible.

Numbers are rounded down to the nearest integer.

Examples:

> (->int 3)

3

> (->int 3.5)

3

> (->int -2.5)

-3

> (->int (+ 3 (/ 1 2)))

3

Stringlike values — paths, symbols, and strings — are converted to numbers and rounded down.

Examples:

> (->int "3.5")

3

> (->int '3.5)

3

> (->int (string->path "3.5"))

3

Characters are directly converted to integers.

Examples:

> (->int #\A)

65

> (->int #\◊)

9674

Lists, vectors, and other multi-value datatypes return their length (using len).

Examples:

> (->int (list 5 6 7))

3

> (->int (hash 'a 1 'b 2 'c 3))

3

The function will raise an error if no sensible conversion is possible.

Example:

> (->int #t)

Can’t convert #t to integer

procedure

(->string v) → string?

  v : any/c
Return the most natural string representation of v, or raise an error if none exists.

Examples:

> (->string "string")

"string"

> (->string 'symbol)

"symbol"

> (->string 98.6)

"98.6"

> (->string (string->path "stdio.h"))

"stdio.h"

> (->string #\A)

"A"

> (->string #t)

Can’t convert #t to string

procedure

(->symbol v) → symbol?

  v : any/c
Same as ->string, but return a symbol rather than a string.

Examples:

> (->symbol "string")

'string

> (->symbol 'symbol)

'symbol

> (->symbol 98.6)

'|98.6|

> (->symbol (string->path "stdio.h"))

'stdio.h

> (->symbol #\A)

'A

> (->symbol #t)

Can’t convert #t to symbol

procedure

(->path v) → path?

  v : any/c

procedure

(->complete-path v) → complete-path?

  v : any/c
Same as ->string, but return a path (or complete path) rather than a string.

Examples:

> (->path "string")

#<path:string>

> (->path 'symbol)

#<path:symbol>

> (->complete-path 98.6)

#<path:/Users/MB/git/sugar/98.6>

> (->complete-path (string->path "stdio.h"))

#<path:/Users/MB/git/sugar/stdio.h>

> (->complete-path #\A)

#<path:/Users/MB/git/sugar/A>

> (->complete-path #t)

Can’t convert #t to complete-path

procedure

(->list v) → list?

  v : any/c
If v is a listlike data type — a vector, set, stream, sequence, or list — convert it to a list. A hash or dictionary becomes a list using dict->list. If v is an atomic value, turn it into a single-member list.

Note that a string is treated as an atomic value rather than decomposed with string->list. This is done so the function handles strings the same way as symbols and paths.

Examples:

> (->list '(a b c))

'(a b c)

> (->list (list->vector '(a b c)))

'(a b c)

> (->list (make-hash '((k . v) (k2 . v2))))

'((k . v) (k2 . v2))

> (->list "string")

'("string")

> (->list 'symbol)

'(symbol)

> (->list (string->path "path"))

'(#<path:path>)

> (->list +)

'(#<procedure:+>)

procedure

(->vector v) → vector?

  v : any/c
Same as ->list, but returns a vector rather than a list.

Examples:

> (->vector '(a b c))

'#(a b c)

> (->vector (list->vector '(a b c)))

'#(a b c)

> (->vector (make-hash '((k . v) (k2 . v2))))

'#((k . v) (k2 . v2))

> (->vector "string")

'#("string")

> (->vector 'symbol)

'#(symbol)

> (->vector (string->path "path"))

'#(#<path:path>)

> (->vector +)

'#(#<procedure:+>)

procedure

(->boolean v) → boolean?

  v : any/c
Return #t for all v except #f, which remains #f.

Examples:

> (->boolean "string")

#t

> (->boolean 'symbol)

#t

> (->boolean +)

#t

> (->boolean '(l i s t))

#t

> (->boolean #f)

#f

procedure

(intish? v) → boolean?

  v : any/c

procedure

(stringish? v) → boolean?

  v : any/c

procedure

(symbolish? v) → boolean?

  v : any/c

procedure

(pathish? v) → boolean?

  v : any/c

procedure

(complete-pathish? v) → boolean?

  v : any/c

procedure

(listish? v) → boolean?

  v : any/c

procedure

(vectorish? v) → boolean?

  v : any/c
Predicates that report whether v can be coerced to the specified type.

Examples:

> (map intish? (list 3 3.5 #\A "A" + #t))

'(#t #t #t #f #f #f)

> (map stringish? (list 3 3.5 #\A "A" + #t))

'(#t #t #t #t #f #f)

> (map symbolish? (list 3 3.5 #\A "A" + #t))

'(#t #t #t #t #f #f)

> (map pathish? (list 3 3.5 #\A "A" + #t))

'(#t #t #t #t #f #f)

> (map complete-pathish? (list 3 3.5 #\A "A" + #t))

'(#t #t #t #t #f #f)

> (map listish? (list 3 3.5 #\A "A" + #t))

'(#t #t #t #t #t #t)

> (map vectorish? (list 3 3.5 #\A "A" + #t))

'(#t #t #t #t #t #t)

2.2 Coercion contracts

procedure

(coerce/int? v) → integer?

  v : any/c

procedure

(coerce/string? v) → string?

  v : any/c

procedure

(coerce/symbol? v) → symbol?

  v : any/c

procedure

(coerce/path? v) → path?

  v : any/c

procedure

(coerce/boolean? v) → boolean?

  v : any/c
If v can be coerced to the specified type, change it to that type, then return it. If not, raise the usual contract error. These contracts can be used with input or output values.

Examples:

> (define/contract (add-ints x y)
      (coerce/int? coerce/int? . -> . any/c)
      (+ x y))
; Input arguments will be coerced to integers, then added
> (add-ints 1.6 3.8)

4

> (define/contract (int-sum x y)
      (any/c any/c . -> . coerce/int?)
      (+ x y))
; Input arguments will be added, and the result coerced to an integer
> (int-sum 1.6 3.8)

5

Please note: this is not an officially sanctioned way to use Racket’s contract system, because contracts aren’t supposed to mutate their values (see make-contract).

But coercion contracts can be useful in two situations:

  • You want to be liberal about input types, but don’t want to deal with the housekeeping and manual conversions between types.

  • Your contract involves an expensive operation that you’d rather avoid performing twice.

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\ No newline at end of file diff --git a/doc/Container.html b/doc/Container.html index a73b971..3c6c06e 100644 --- a/doc/Container.html +++ b/doc/Container.html @@ -1,2 +1,2 @@ -3 Container
▼Sugar:   readability & convenience library
On this page:
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in?
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3 Container

 (require sugar/container) package: sugar

Type-neutral functions for getting elements out of a container, or testing membership.

procedure

(get container which [end_which]) → any/c

  container : (or/c list? vector? sequence? dict? string? symbol? path?)
  which : any/c
  end_which : (or/c (and/c integer? positive?) #f) = #f
For a container that’s a dict?, retrieve the element associated with the key which. Raise an error if the key doesn’t exist.

Examples:

> (get (make-hash '((a . 1) (b . 2) (c  . 3))) 'b)

2

> (get (make-hash '((a . 1) (b . 2) (c  . 3))) 'z)

get: couldn’t retrieve item z from #hash((a . 1) (c . 3) (b

. 2))

For other container types — which are all sequence-like — retrieve the element located at which. Or if the optional end_which argument is provided, retrieve the elements from which to (sub1 end_which), inclusive (i.e., make a slice). Raise an error if which or end_which is out of bounds.

Examples:

> (get '(0 1 2 3 4 5) 2)

2

> (get '(0 1 2 3 4 5) 2 4)

'(2 3)

> (get '(0 1 2 3 4 5) 100)

get: couldn’t retrieve item 100 from (0 1 2 3 4 5)

> (get '(0 1 2 3 4 5) 2 100)

get: couldn’t retrieve items 2 through 100 from (0 1 2 3 4

5)

> (get (list->vector '(0 1 2 3 4 5)) 2)

2

> (get (list->vector '(0 1 2 3 4 5)) 2 4)

'#(2 3)

> (get "purple" 2)

"r"

> (get "purple" 2 4)

"rp"

> (get 'purple 2)

'r

> (get 'purple 2 4)

'rp

When container is a path, it’s treated as a list of exploded path elements, not as a stringlike value.

Examples:

> (get (string->path "/root/foo/bar/file.txt") 1)

#<path:root>

> (get (string->path "/root/foo/bar/file.txt") 0 3)

'(#<path:/> #<path:root> #<path:foo>)

To slice to the end of container, use (len container) as the value of end_which.

Examples:

> (define xs '(0 1 2 3 4 5))
> (get xs 2 (len xs))

'(2 3 4 5)

> (get (list->vector xs) 2 (len (list->vector xs)))

'#(2 3 4 5)

> (define color "purple")
> (get color 2 (len color))

"rple"

procedure

(in? item container) → boolean?

  item : any/c
  container : (or/c list? vector? sequence? set? dict? string? symbol? path?)
Return #t if item is in container, or #f otherwise.

Examples:

> (in? 2 '(0 1 2 3 4 5))

#t

> (in? 'a '(0 1 2 3 4 5))

#f

> (in? 2 (list->vector '(0 1 2 3 4 5)))

#t

> (in? "pu" "purple")

#t

> (in? "zig" "purple")

#f

> (in? 'b (make-hash '((a . 1) (b . 2) (c  . 3))))

#t

> (in? 'z (make-hash '((a . 1) (b . 2) (c  . 3))))

#f

As with get, when container is a path, it’s treated as a list of exploded path elements, not as a stringlike value.

Examples:

> (in? "foo" (string->path "/root/foo/bar/file.txt"))

#t

> (in? "zam" (string->path "/root/foo/bar/file.txt"))

#f

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\ No newline at end of file +3 Container
▼Sugar:   readability & convenience library
On this page:
get
in?
6.0.1.13
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3 Container

 (require sugar/container) package: sugar

Type-neutral functions for getting elements out of a container, or testing membership.

procedure

(get container which [end_which]) → any/c

  container : (or/c list? vector? sequence? dict? string? symbol? path?)
  which : any/c
  end_which : (or/c (and/c integer? positive?) #f) = #f
For a container that’s a dict?, retrieve the element associated with the key which. Raise an error if the key doesn’t exist.

Examples:

> (get (make-hash '((a . 1) (b . 2) (c  . 3))) 'b)

2

> (get (make-hash '((a . 1) (b . 2) (c  . 3))) 'z)

get: couldn’t retrieve item z from #hash((a . 1) (c . 3) (b

. 2))

For other container types — which are all sequence-like — retrieve the element located at which. Or if the optional end_which argument is provided, retrieve the elements from which to (sub1 end_which), inclusive (i.e., make a slice). Raise an error if which or end_which is out of bounds.

Examples:

> (get '(0 1 2 3 4 5) 2)

2

> (get '(0 1 2 3 4 5) 2 4)

'(2 3)

> (get '(0 1 2 3 4 5) 100)

get: couldn’t retrieve item 100 from (0 1 2 3 4 5)

> (get '(0 1 2 3 4 5) 2 100)

get: couldn’t retrieve items 2 through 100 from (0 1 2 3 4

5)

> (get (list->vector '(0 1 2 3 4 5)) 2)

2

> (get (list->vector '(0 1 2 3 4 5)) 2 4)

'#(2 3)

> (get "purple" 2)

"r"

> (get "purple" 2 4)

"rp"

> (get 'purple 2)

'r

> (get 'purple 2 4)

'rp

When container is a path, it’s treated as a list of path elements (created by explode-path), not as a stringlike value.

Examples:

> (get (string->path "/root/foo/bar/file.txt") 1)

#<path:root>

> (get (string->path "/root/foo/bar/file.txt") 0 3)

'(#<path:/> #<path:root> #<path:foo>)

To slice to the end of container, use (len container) as the value of end_which.

Examples:

> (define xs '(0 1 2 3 4 5))
> (get xs 2 (len xs))

'(2 3 4 5)

> (get (list->vector xs) 2 (len (list->vector xs)))

'#(2 3 4 5)

> (define color "purple")
> (get color 2 (len color))

"rple"

procedure

(in? item container) → boolean?

  item : any/c
  container : (or/c list? vector? sequence? set? dict? string? symbol? path?)
Return #t if item is in container, or #f otherwise.

Examples:

> (in? 2 '(0 1 2 3 4 5))

#t

> (in? 'a '(0 1 2 3 4 5))

#f

> (in? 2 (list->vector '(0 1 2 3 4 5)))

#t

> (in? "pu" "purple")

#t

> (in? "zig" "purple")

#f

> (in? 'b (make-hash '((a . 1) (b . 2) (c  . 3))))

#t

> (in? 'z (make-hash '((a . 1) (b . 2) (c  . 3))))

#f

As with get, when container is a path, it’s treated as a list of exploded path elements, not as a stringlike value.

Examples:

> (in? "foo" (string->path "/root/foo/bar/file.txt"))

#t

> (in? "zam" (string->path "/root/foo/bar/file.txt"))

#f

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\ No newline at end of file diff --git a/doc/Debug.html b/doc/Debug.html new file mode 100644 index 0000000..94361cf --- /dev/null +++ b/doc/Debug.html @@ -0,0 +1,3 @@ + +4 Debug
▼Sugar:   readability & convenience library
On this page:
report
6.0.1.13
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4 Debug

 (require sugar/debug) package: sugar

Debugging utilities.

syntax

(report expr)

Print the name and value of expr to current-error-port, but also return the evaluated result of expr as usual. This lets you see the value of an expression or variable at runtime without disrupting any of the surrounding code.

For instance, suppose you wanted to see how first-condition? was being evaluted in this expression:

(if (and (first-condition? x) (second-condition? x))
  (one-thing)
  (other-thing))

You can wrap it in report and find out:

(if (and (report (first-condition? x)) (second-condition? x))
  (one-thing)
  (other-thing))

This code will run the same way as before. But when it reaches first-condition?, you willl see in current-error-port:

(first-condition? x) = #t

You can also add standalone calls to report as a debugging aid at points where the return value will be irrelevant, for instance:

(report x)
(if (and (report (first-condition? x)) (second-condition? x))
  (one-thing)
  (other-thing))

x = 42 +
(first-condition? x) = #t

But don’t do this, because the result of the if expression will be skipped in favor of the last expression, which will be the value of x:

(if (and (report (first-condition? x)) (second-condition? x))
  (one-thing)
  (other-thing))
  (report x)
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\ No newline at end of file diff --git a/doc/File.html b/doc/File.html new file mode 100644 index 0000000..a7b7d57 --- /dev/null +++ b/doc/File.html @@ -0,0 +1,2 @@ + +5 File
▼Sugar:   readability & convenience library
On this page:
get-ext
has-ext?
remove-ext
remove-ext*
add-ext
get-enclosing-dir
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5 File

 (require sugar/file) package: sugar

File utilities, mostly in the realm of file extensions. These functions don’t access the filesystem.

Arguments that are pathish? can take either a string or a path. For clarity below, I’ve used strings.

procedure

(get-ext file-path) → (or/c #f string?)

  file-path : pathish?
Return the last file extension of file-path as a string, or #f if it has no extension. Omit the intervening . separator.

Examples:

> (get-ext "foo.txt")

"txt"

> (get-ext "/path/to/foo.txt")

"txt"

> (get-ext "/path/to/foo.txt.bar")

"bar"

> (get-ext "/path/to/file-without-extension")

#f

> (get-ext "/path/to/directory/")

#f

procedure

(has-ext? file-path ext) → boolean?

  file-path : pathish?
  ext : stringish?
Return #t if the last file extension of file-path is ext, otherwise #f.

Examples:

> (has-ext? "foo.txt" "txt")

#t

> (has-ext? "foo.txt" "jpg")

#f

> (has-ext? "foo.jpg.txt" "jpg")

#f

procedure

(remove-ext file-path) → path?

  file-path : pathish?
Remove the last file extension of file-path, and return the path that remains. If file-path has no extension, you just get the same file-path. Does not use the filesystem.

Examples:

> (remove-ext "foo.txt")

#<path:foo>

> (remove-ext "/path/to/foo.txt")

#<path:/path/to/foo>

> (remove-ext "/path/to/foo.txt.bar")

#<path:/path/to/foo.txt>

> (remove-ext (remove-ext "/path/to/foo.txt.bar"))

#<path:/path/to/foo>

procedure

(remove-ext* file-path) → path?

  file-path : pathish?
Like remove-ext, just more. Remove all file extensions from file-path, and return the path that remains. If file-path has no extensions, you just get the same file-path. Does not use the filesystem.

Examples:

> (remove-ext* "foo.txt")

#<path:foo>

> (remove-ext* "/path/to/foo.txt")

#<path:/path/to/foo>

> (remove-ext* "/path/to/foo.txt.bar")

#<path:/path/to/foo>

> (remove-ext* (remove-ext* "/path/to/foo.txt.bar"))

#<path:/path/to/foo>

procedure

(add-ext file-path ext) → path?

  file-path : pathish?
  ext : stringish?
Return a new file-path with ext appended. Note that this does not replace an existing file extension. If that’s what you want, then do (add-ext (remove-ext file-path) ext).

Examples:

> (add-ext "foo" "txt")

#<path:foo.txt>

> (add-ext "foo.txt" "jpg")

#<path:foo.txt.jpg>

> (add-ext (remove-ext "foo.txt") "jpg")

#<path:foo.jpg>

procedure

(get-enclosing-dir path) → path?

  path : pathish?
Return the enclosing directory of path. Does not consult the filesystem about whether path is valid. If you reach the root directory, then (get-enclosing-dir root) will just return root again.

Examples:

> (define bin (string->path "/usr/bin"))
> bin

#<path:/usr/bin>

> (get-enclosing-dir bin)

#<path:/usr/>

> (get-enclosing-dir (get-enclosing-dir bin))

#<path:/>

> (get-enclosing-dir (get-enclosing-dir (get-enclosing-dir bin)))

#<path:/>

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▼Sugar:   readability & convenience library
6.0.1.13
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1 Installation & updates

At the command line: +1 Installation & updates
▼Sugar:   readability & convenience library
6.0.1.13
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1 Installation & updates

At the command line:

raco pkg install sugar

After that, you can update the package from the command line:

raco pkg update sugar

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▼Sugar:   readability & convenience library
On this page:
len
6.0.1.13
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4 Len

 (require sugar/len) package: sugar

procedure

(len x) → integer?

  x : (or/c list? string? symbol? vector? hash? integer? set?)
Convert x to a length in the least surprising way possible, or raise an error if it can’t be done.

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▼Sugar:   readability & convenience library
On this page:
len
6.0.1.13
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6 Len

 (require sugar/len) package: sugar

procedure

(len x) → integer?

  x : (or/c list? string? symbol? vector? hash? integer? set?)
Convert x to a length in the least surprising way possible, or raise an error if it can’t be done.

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▼Sugar:   readability & convenience library
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5 License & source code

This module is licensed under the LGPL.

Source repository at http://github.com/mbutterick/sugar. Suggestions & corrections welcome.

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▼Sugar:   readability & convenience library
6.0.1.13
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7 License & source code

This module is licensed under the LGPL.

Source repository at http://github.com/mbutterick/sugar. Suggestions & corrections welcome.

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▼Sugar:   readability & convenience library
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Index

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

 

->boolean
->complete-path
->int
->list
->path
->string
->symbol
->vector
coerce/boolean?
coerce/int?
coerce/path?
coerce/string?
coerce/symbol?
Coercion
Coercion contracts
complete-pathish?
Container
get
in?
Installation & updates
intish?
Len
len
License & source code
listish?
pathish?
stringish?
sugar
sugar/coerce
sugar/container
sugar/len
Sugar: readability & convenience library
symbolish?
Values
vectorish?

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▼Sugar:   readability & convenience library
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Index

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

 

->boolean
->complete-path
->int
->list
->path
->string
->symbol
->vector
add-ext
coerce/boolean?
coerce/int?
coerce/path?
coerce/string?
coerce/symbol?
Coercion
Coercion contracts
complete-pathish?
Container
Debug
File
get
get-enclosing-dir
get-ext
has-ext?
in?
Installation & updates
intish?
Len
len
License & source code
listish?
pathish?
remove-ext
remove-ext*
report
stringish?
sugar
sugar/coerce
sugar/container
sugar/debug
sugar/file
sugar/len
Sugar: readability & convenience library
symbolish?
Values
vectorish?

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▼Sugar:   readability & convenience library
On this page:
Sugar:   readability & convenience library
6.0.1.13
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Sugar: readability & convenience library

Matthew Butterick <mb@mbtype.com>

 (require sugar) package: sugar

A collection of small functions to help make Racket code simpler & more readable.

    1 Installation & updates

    2 Coercion

      2.1 Values

      2.2 Coercion contracts

    3 Container

    4 Len

    5 License & source code

    Index

    ← prev  up  next → 
 
\ No newline at end of file +Sugar: readability & convenience library
▼Sugar:   readability & convenience library
On this page:
Sugar:   readability & convenience library
6.0.1.13
    ← prev  up  next → 

Sugar: readability & convenience library

Matthew Butterick <mb@mbtype.com>

 (require sugar) package: sugar

A collection of small functions to help make Racket code simpler & more readable.

    1 Installation & updates

    2 Coercion

      2.1 Values

      2.2 Coercion contracts

    3 Container

    4 Debug

    5 File

    6 Len

    7 License & source code

    Index

    ← prev  up  next → 
 
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