36 lines
1.7 KiB
Factor
36 lines
1.7 KiB
Factor
USING: help.syntax help.markup strings ;
|
|
IN: unicode.normalize
|
|
|
|
ABOUT: "unicode.normalize"
|
|
|
|
ARTICLE: "unicode.normalize" "Unicode normalization"
|
|
"The " { $vocab-link "unicode.normalize" } " vocabulary defines words for normalizing Unicode strings."
|
|
$nl
|
|
"In Unicode, it is often possible to have multiple sequences of characters which really represent exactly the same thing. For example, to represent e with an acute accent above, there are two possible strings: " { $snippet "\"e\\u000301\"" } " (the e character, followed by the combining acute accent character) and " { $snippet "\"\\u0000e9\"" } " (a single character, e with an acute accent)."
|
|
$nl
|
|
"There are four normalization forms: NFD, NFC, NFKD, and NFKC. Basically, in NFD and NFKD, everything is expanded, whereas in NFC and NFKC, everything is contracted. In NFKD and NFKC, more things are expanded and contracted. This is a process which loses some information, so it should be done only with care."
|
|
$nl
|
|
"Most of the world uses NFC to communicate, but for many purposes, NFD/NFKD is easier to process. For more information, see Unicode Standard Annex #15 and section 3 of the Unicode standard."
|
|
{ $subsections
|
|
nfc
|
|
nfd
|
|
nfkc
|
|
nfkd
|
|
} ;
|
|
|
|
HELP: nfc
|
|
{ $values { "string" string } { "nfc" "a string in NFC" } }
|
|
{ $description "Converts a string to Normalization Form C." } ;
|
|
|
|
HELP: nfd
|
|
{ $values { "string" string } { "nfd" "a string in NFD" } }
|
|
{ $description "Converts a string to Normalization Form D." } ;
|
|
|
|
HELP: nfkc
|
|
{ $values { "string" string } { "nfkc" "a string in NFKC" } }
|
|
{ $description "Converts a string to Normalization Form KC." } ;
|
|
|
|
HELP: nfkd
|
|
{ $values { "string" string } { "nfkd" "a string in NFKD" } }
|
|
{ $description "Converts a string to Normalization Form KD." } ;
|