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Article contents:== Outdated egg! This is an egg for CHICKEN 3, the unsupported old release. You're almost certainly looking for [[/eggref/4/locale|the CHICKEN 4 version of this egg]], if it exists. If it does not exist, there may be equivalent functionality provided by another egg; have a look at the [[https://wiki.call-cc.org/chicken-projects/egg-index-4.html|egg index]]. Otherwise, please consider porting this egg to the current version of CHICKEN. [[tags: egg]] == locale Provides locale operations. [[toc:]] == Documentation ''locale'' is a set of routines supporting locale query operations. The environment locale information is determined upon module load and the corresponding parameters are set. ''locale'' does not interact with the C library routines {{setlocale}} or {{tzset}}, except for the {{with-tzset}} routine (see below). ''locale'' does not provide a localized message service, see [[srfi-29|SRFI 29]]. ''locale'' does not provide a localized time service, see [[srfi-19|SRFI 19]]. ''locale'' does not provide a localized collating service. ''locale'' does not provide much of anything beyond locale identification. === Locale Components The major data structure is the {{locale-components}} object, portrayed as an extensible {{key+value}} pairing. The {{key}} is a {{symbol}}. The {{value}} is usually a {{string}}. A {{locale-components}} object will have more properties but the following are provided for every instance: Common Component Keys: ; tag : What kind. Examples: 'locale and 'timezone. ; name : The composite information object, source specific. ; source : The origin for the information. A primary source is one of the following (others are possible): ; PLATFORM : Information from the system. ; POSIX : Information from POSIX environment. The "name" is a string. ; GNU : Information from GNU environment. ; BUILTIN : Information from system defaults. * The {{PLATFORM}} source is used for information first. (Currently unavailable.) * Then the {{POSIX/GNU}} source is attempted. * When all have failed the {{BUILTIN}} source is used. The point being locale information will be available, but without an accuracy guarantee. The {{BUILTIN}} source creates a POSIX-style string "name" constructed using constants and library procedures. The {{source}} is either a {{string}} or a {{(string object...)}}: ; POSIX : ("POSIX" "<environment variable name>"). Example: {{("POSIX" "TZ")}}. ; GNU : ("GNU" "<environment variable name>"). Example: {{("GNU" "LANGUAGE")}}. === Locale Components ==== make-locale-components <procedure>(make-locale-components NAME [SOURCE #f [TAG 'locale]]) => LOCALE-COMPONENTS</procedure> Returns a new {{locale-components}} object. ==== locale-components? <procedure>(locale-components? OBJECT) => BOOLEAN</procedure> Is the {{OBJECT}} a {{locale-compenents}} object? ==== locale-components-exists? <procedure>(locale-components-exists? LOCALE-COMPONENTS KEY) => BOOLEAN</procedure> Does the specified {{LOCALE-COMPONENTS}} have a value for {{KEY}}? ==== locale-component-ref <procedure>(locale-component-ref LOCALE-COMPONENTS KEY [DEFAULT #f]) => OBJECT</procedure> Returns the {{KEY}} property of {{LOCALE-COMPONENTS}} or the {{DEFAULT}} when not found. ==== set-locale-component! <procedure>(set-locale-component! LOCALE-COMPONENTS KEY VALUE)</procedure> Updates or creates the {{KEY}} property of {{LOCALE-COMPONENTS}} with the {{VALUE}}. ==== update-locale-components! <procedure>(update-locale-components! LOCALE-COMPONENTS KEY VALUE ...) => LOCALE-COMPONENTS</procedure> Updates in place the {{LOCALE-COMPONENTS}} with the specified {{KEY+VALUE}} pairs. === Locale Access to locale information. A locale object is composed of a Language, an optional Script, an optional Region, an optional Codeset, and an optional Modifier. The language should be an ISO 639-1 or ISO 639-2 name. The Script should be a RFC 3066bis name. The region should be an ISO 3166-1 name. The codeset and modifier forms are locale dependent. Locale Properties: ; language : ISO 639-1 or ISO 639-2 name string. Default "en". ; script : RFC 3066bis name string. ; region : ISO 3166-1 name string. Default "US". ; codeset : The character code to character mapping system. ; modifier : Instance data, if any. ==== current-locale <procedure>(current-locale) => STRING</procedure> <procedure>(current-locale VALUE)</procedure> The currently defined locale. Returns the locale name string. The specified {{VALUE}} is either a locale string value, a {{locale-components}} object or {{#f}}, indicating locale independence. When no locale value is set the default locale is {{#f}}. ==== current-locale-component <procedure>(current-locale-components) => LOCALE-COMPONENTS</procedure> Returns the {{locale-components}} object corresponding to the current-locale. ==== posix-locale-string->locale-components <procedure>(posix-locale-string->locale-components STRING [SOURCE "POSIX" [TAG 'locale]]) => LOCALE-COMPONENTS</procedure> Parses a POSIX locale string specification, {{STRING}}, and returns the corresponding locale-components object, or {{#f}} when a parse error occurs. A {{#f}} or empty string value is mapped to the default locale. The optional {{SOURCE}} indicates what locale system supplied the string. ==== posix-load-local <procedure>(posix-load-locale)</procedure> Sets up the locale using POSIX rules. Initializes the {{current-locale}} from the {{MESSAGES}} category. The Posix pathname locale is currently unsupported. The "C" & "POSIX" locales are unsupported. === Timezone Access to timezone information. A timezone object is a {{locale-components}} object with properties for Standard Time Name and Offset, and an optional Summer or Daylight Saving Time Name and Offset. The offset is seconds west (positive or east (negative of UTC. The name is some locally accepted timezone name, such as "PST". A Daylight Saving Time start rule and end rule are optional properties. Timezone Component Properties: ; std-name : The Standard timezone name. ; std-offset : Seconds +/- UTC. ; dst-name : The Daylight Saving Time timezone name. ; dst-offset : Seconds +/- UTC. ; dst-start : The start of Daylight Saving Time; a timezone-dst-rule. ; dst-end : The end of Daylight Saving Time; a timezone-dst-rule. ==== current-timezone <procedure>(current-timezone) => STRING</procedure> <procedure>(current-timezone VALUE)</procedure> The currently defined timezone. Retruns the timezone name string. The specified {{VALUE}} is either a timezone string value, a {{timezone-components}} or {{#f}}, indicating no timezone. When no timezone value is set the default timezone is UTC. ==== current-timezone-component <procedure>(current-timezone-components) => TIMEZONE-COMPONENTS</procedure> Returns the timezone-components object corresponding to the current-timezone. ==== posix-timezone-string->timezone-components <procedure>(posix-timezone-string->timezone-components STRING [SOURCE "POSIX"]) => TIMEZONE-COMPONENTS</procedure> Parses a POSIX timezone string specification, {{STRING}}, and returns the corresponding timezone-components object, or {{#f}} when a parse error occurs. A {{#f}} or empty string value is mapped to the default timezone. The optional {{SOURCE}} indicates what locale system supplied the string. ==== posix-load-timezone <procedure>(posix-load-timezone)</procedure> Initialize the current-timezone from the TZ environment variable. The Posix pathname and implementation-defined timezone is currently unsupported. === Timezone Components ==== make-timezone-components <procedure>(make-timezone-components NAME [SOURCE #f]) => TIMEZONE-COMPONENTS</procedure> Returns a new {{timezone-components}} object. ==== timezone-components? <procedure>(timezone-components? OBJECT) => BOOLEAN</procedure> Is the specified {{OBJECT}} actually a timezone-components object? Note that a {{timezone-components}} object is-a {{locale-compenents}} object. ==== timezone-components-exists? <procedure>(timezone-components-exists? TIMEZONE-COMPONENTS KEY) => BOOLEAN</procedure> Does the specified {{TIMEZONE-COMPONENTS}} have a value for {{KEY}}? ==== timezone-component-ref <procedure>(timezone-component-ref TIMEZONE-COMPONENTS KEY [DEFAULT #f])</procedure> Returns the timezone-component {{KEY}} of the {{TIMEZONE-COMPONENTS}} object, or the {{DEFAULT}} for a missing component. ==== set-timezone-component! <procedure>(set-timezone-component! TIMEZONE-COMPONENTS KEY VALUE)</procedure> Sets the timezone-component {{KEY}} of the {{TIMEZONE-COMPONENTS}} object to {{VALUE}}. ==== update-timezone-components! <procedure>(update-timezone-components! TIMEZONE-COMPONENTS KEY VALUE ...) => TIMEZONE-COMPONENTS</procedure> Updates in place the {{TIMEZONE-COMPONENTS}} with the specified {{KEY+VALUE}} pairs. ==== timezone-dst-rule-julian-noleap? <procedure>(timezone-dst-rule-julian-noleap? OBJECT) => BOOLEAN</procedure> Is the specified {{OBJECT}} actually a daylight saving time julian day without leap seconds object? ==== timezone-dst-rule-julian-leap? <procedure>(timezone-dst-rule-julian-leap? OBJECT) => BOOLEAN</procedure> Is the specified {{OBJECT}} actually a daylight saving time julian day assuming leap seconds object? ==== timezone-dst-rule-mwd? <procedure>(timezone-dst-rule-mwd? OBJECT) => BOOLEAN</procedure> Is the specified {{OBJECT}} actually a daylight saving time month+week+day object? ==== timezone-dst-rule-offset <procedure>(timezone-dst-rule-offset TIMEZONE-DST-RULE) => INTEGER</procedure> Returns the seconds within day offset component of the specified {{TIMEZONE-DST-RULE}} object. ==== timezone-dst-rule-julian <procedure>(timezone-dst-rule-julian TIMEZONE-DST-RULE) => INTEGER</procedure> Returns the julian day component of the specified {{TIMEZONE-DST-RULE}} object. ==== timezone-dst-rule-month <procedure>(timezone-dst-rule-month TIMEZONE-DST-RULE) => INTEGER</procedure> Returns the month of year component of the specified {{TIMEZONE-DST-RULE}} object. ==== timezone-dst-rule-week <procedure>(timezone-dst-rule-week TIMEZONE-DST-RULE) => INTEGER</procedure> Returns the week of month component of the specified {{TIMEZONE-DST-RULE}} object. ==== timezone-dst-rule-day <procedure>(timezone-dst-rule-day TIMEZONE-DST-RULE) => INTEGER</procedure> Returns the day of week component of the specified {{TIMEZONE-DST-RULE}} object. ==== make-timezone-dst-rule-julian-leap <procedure>(make-timezone-dst-rule-julian-leap JULIAN-DAY OFFSET) => TIMEZONE-DST-RULE</procedure> Returns a daylight saving time julian day assuming leap seconds rule object. ==== make-timezone-dst-rule-julian-noleap <procedure>(make-timezone-dst-rule-julian-noleap JULIAN-DAY OFFSET) => TIMEZONE-DST-RULE</procedure> Returns a daylight saving time julian day without leap seconds rule object. ==== make-timezone-dst-rule-mwd <procedure>(make-timezone-dst-rule-mwd MONTH WEEK DAY OFFSET) => TIMEZONE-DST-RULE</procedure> Returns a daylight saving time month.week.day rule object. ==== local-timezone <procedure>(local-timezone TM | YEAR MONTH DAY [HOUR 12 [MINUTE 0 [SECOND 0]]] [#:offset? OFFSET? #f]) => STRING</procedure> Returns the timezone for the given date as a string, (e.g. "EST"). If {{OFFSET?}} is {{#t}}, then return it in RFC-822 format (e.g. "-0500"). The date maybe specified using a 10-element time-vector {{TM}} or separately as {{YEAR MONTH DAY [HOUR 12 [MINUTE 0 [SECOND 0]]]}}. {{YEAR}} will be biased by {{-1900}}, except for a {{TM}} argument. ((MONTH}} in [0 11]. {{DAY}} in [1 31]. {{HOUR}} in [0 23]. {{MINUTE}} in [0 59]. {{SECOND}} in [0 60]. ==== local-timezone-offset <procedure>(local-timezone-offset TM | YEAR MONTH DAY [HOUR 12 [MINUTE 0 [SECOND 0]]]) => FIXNUM</procedure> Returns the timezone offset as seconds where positive is east of UTC & negative is west of UTC. ==== with-tzset <procedure>(with-tzset TZ THUNK) => OBJECT</procedure> Invoke {{THUNK}} with the TZ environment variable bound to the string {{TZ}}. Uses the C library routine {{tzset}}. Restores the original TZ value. === Locale Category Access to the locale information by category. Locale Category Keys (others are possible): ; address : A {{locale-components} object. ; collate : A {{locale-components} object. ; ctype : A {{locale-components} object. ; identification : A {{locale-components} object. ; language : A {{language-components} object. ; measurement : A {{locale-components} object. ; messages : A {{locale-components} object. ; monetary : A {{locale-components} object. ; name : A {{locale-components} object. ; numeric : A {{locale-components} object. ; paper : A {{locale-components} object. ; telephone : A {{locale-components} object. ; time : A {{locale-components} object. ; timezone : A {{timezone-components} object. ==== make-locale-dictionary <procedure>(make-locale-dictionary) => LOCALE-CATEGORIES</procedure> Returns a new {{locale-categories}} object. ==== locale-dictionary? <procedure>(locale-dictionary? OBJECT) => BOOLEAN</procedure> Is the specified {{OBJECT}} a {{locale-categories}} object? ==== locale-dictionary-category <procedure>(locale-dictionary-category LOCALE-CATEGORIES KEY [DEFAULT #f]) => OBJECT</procedure> Returns the value for {{KEY}} in the {{LOCALE-CATEGORIES}}. ==== set-locale-dictionary-category! <procedure>(set-locale-dictionary-category! LOCALE-CATEGORIES KEY VALUE)</procedure> Changes the {{VALUE}} for {{KEY}} in the {{LOCALE-CATEGORIES}}. A {{VALUE}} of {{#f}} will delete the category identified by {{KEY}}. ==== current-locale-dictionary <parameter>(current-locale-dictionary) => LOCALE-CATEGORIES</parameter> <parameter>(current-locale-dictionary LOCALE-CATEGORIES)</parameter> Gets and sets the current {{locale-categories}} object. ==== locale-category-ref <procedure>(locale-category-ref CATEGORY [DEFAULT #f])</procedure> Returns the specified {{CATEGORY}} locale-components object, or {{#f}} if the category is not valued. ==== set-locale-category! <procedure>(set-locale-category! CATEGORY LOCALE-COMPONENTS)</procedure> Sets the specified {{CATEGORY}} to the specified {{LOCALE-COMPONENTS}} object. == Usage <enscript language=scheme> (require-extension locale) </enscript> == Examples == Notes * This is a work in progress. Currently only the Posix locale information is supported. Plans are to support the native MacOS X and Windows locale APIs. == Requirements [[lookup-table|lookup-table]] [[miscmacros|miscmacros]] == Bugs and Limitations == Author [[/users/kon lovett|kon lovett]] == Version history ; 0.5.1 : Added 'with-tzset'. Added TM argument support to 'local-timezone' & 'local-timezone-offset'. ; 0.5.0 : Added 'local-timezone' & 'local-timezone-offset'. ; 0.4.0 : Added "buitlin" timezone & locale. Added categories. ; 0.3.3 : Removed use of 'critical-section'. ; 0.3.2 : Dropped ':optional'. ; 0.3.1 : Bug fix for default dst offset. ; 0.3 : Reverts to defaults for timezone & locale when parse errors. ; 0.2 : Exports. ; 0.1 : Initial release. == License Copyright (C 2009 Kon Lovett. All rights reserved. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the Software, to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED ASIS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 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