mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-16 16:16:40 +03:00
Joey Parrish
f539147d48
This fixes all the license headers in the main library, which corrects the appearance of the main license in the compiled output. It seems that the `!` in the header forces the compiler to keep it in the output. I believe older compiler releases did this purely based on `@license`. Issue #2638 Change-Id: I7f0e918caad10c9af689c9d07672b7fe9be7b2f3
485 lines
17 KiB
JavaScript
485 lines
17 KiB
JavaScript
/*! @license
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* Shaka Player
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* Copyright 2016 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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goog.provide('shaka.util.LanguageUtils');
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goog.require('goog.asserts');
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/**
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* @summary A set of language utility functions.
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* @final
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*/
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shaka.util.LanguageUtils = class {
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/**
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* Check if |locale1| and |locale2| are locale-compatible.
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*
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* Locale-compatible is defined as all components in each locale match. Since
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* we only respect the language and region components, we only check that
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* the language and region components match.
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*
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* Examples:
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* Locale A | Locale B | Locale Compatible
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* ---------------------------------------
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* en-US | en-US | true
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* en | en-US | false
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* en-US | en-CA | false
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*
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* @param {string} locale1
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* @param {string} locale2
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* @return {boolean}
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*/
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static areLocaleCompatible(locale1, locale2) {
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const LanguageUtils = shaka.util.LanguageUtils;
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// Even through they SHOULD already be normalized, let's just be safe and
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// do it again.
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locale1 = LanguageUtils.normalize(locale1);
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locale2 = LanguageUtils.normalize(locale2);
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return locale1 == locale2;
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}
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/**
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* Check if |locale1| and |locale2| are language-compatible.
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*
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* Language compatible is when the language component of each locale matches.
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* This means that no matter what region they have (or don't have) as long as
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* the language components match, they are language-compatible.
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*
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* Examples:
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* Locale A | Locale B | Language-Compatible
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* -----------------------------------------
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* en-US | en-US | true
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* en-US | en | true
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* en-US | en-CA | true
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* en-CA | fr-CA | false
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*
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* @param {string} locale1
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* @param {string} locale2
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* @return {boolean}
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*/
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static areLanguageCompatible(locale1, locale2) {
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const LanguageUtils = shaka.util.LanguageUtils;
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// Even through they SHOULD already be normalized, let's just be safe and
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// do it again.
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locale1 = LanguageUtils.normalize(locale1);
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locale2 = LanguageUtils.normalize(locale2);
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// Get all components. This should only be language and region
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// since we do not support dialect.
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/** @type {!Array.<string>} */
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const locale1Components = LanguageUtils.disassembleLocale_(locale1);
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/** @type {!Array.<string>} */
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const locale2Components = LanguageUtils.disassembleLocale_(locale2);
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// We are language compatible if we have the same language.
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return locale1Components[0] == locale2Components[0];
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}
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/**
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* Check if |possibleParent| is the parent locale of |possibleChild|. Because
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* we do not support dialects, the parent-child relationship is a lot simpler.
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* In a parent child relationship:
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* - The parent and child have the same language-component
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* - The parent has no region-component
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* - The child has a region-component
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*
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* Example:
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* Locale A | Locale B | Is A The parent of B?
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* --------------------------------------------
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* en-US | en-US | no
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* en-US | en | no
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* en | en-US | yes
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* en | en | no
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* en | fr | no
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*
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* @param {string} possibleParent
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* @param {string} possibleChild
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* @return {boolean}
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*/
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static isParentOf(possibleParent, possibleChild) {
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const LanguageUtils = shaka.util.LanguageUtils;
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// Even through they SHOULD already be normalized, let's just be safe and
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// do it again.
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possibleParent = LanguageUtils.normalize(possibleParent);
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possibleChild = LanguageUtils.normalize(possibleChild);
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// Get all components. This should only be language and region
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// since we do not support dialect.
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/** @type {!Array.<string>} */
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const possibleParentComponents =
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LanguageUtils.disassembleLocale_(possibleParent);
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/** @type {!Array.<string>} */
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const possibleChildComponents =
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LanguageUtils.disassembleLocale_(possibleChild);
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return possibleParentComponents[0] == possibleChildComponents[0] &&
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possibleParentComponents.length == 1 &&
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possibleChildComponents.length == 2;
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}
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/**
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* Check if |localeA| shares the same parent with |localeB|. Since we don't
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* support dialect, we will only look at language and region. For two locales
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* to be siblings:
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* - Both must have language-components
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* - Both must have region-components
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* - Both must have the same language-component
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*
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* Example:
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* Locale A | Locale B | Siblings?
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* --------------------------------------------
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* en-US | en-US | yes
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* en-US | en-CA | yes
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* en-US | en | no
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* en | en-US | no
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* en | en | no
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* en | fr | no
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*
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* @param {string} localeA
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* @param {string} localeB
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* @return {boolean}
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*/
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static isSiblingOf(localeA, localeB) {
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const LanguageUtils = shaka.util.LanguageUtils;
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// Even through they SHOULD already be normalized, let's just be safe and
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// do it again.
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localeA = LanguageUtils.normalize(localeA);
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localeB = LanguageUtils.normalize(localeB);
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// Get all components. This should only be language and region
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// since we do not support dialect.
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/** @type {!Array.<string>} */
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const localeAComponents = LanguageUtils.disassembleLocale_(localeA);
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/** @type {!Array.<string>} */
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const localeBComponents = LanguageUtils.disassembleLocale_(localeB);
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return localeAComponents.length == 2 &&
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localeBComponents.length == 2 &&
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localeAComponents[0] == localeBComponents[0];
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}
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/**
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* Normalize a locale. This will take a locale and canonicalize it to a state
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* that we are prepared to work with.
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*
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* We only support with:
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* - language
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* - language-REGION
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*
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* If given a dialect, we will discard it. We will convert any 3-character
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* codes to 2-character codes. We will force language codes to lowercase and
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* region codes to uppercase.
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*
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* @param {string} locale
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* @return {string}
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*/
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static normalize(locale) {
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const LanguageUtils = shaka.util.LanguageUtils;
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const components = locale.split('-');
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// We are only going to use the language and the region. If there was
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// a dialect or anything else, we are throwing it a way.
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let language = components[0] || '';
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let region = components[1] || '';
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// Convert the language to lower case. It is standard for the language code
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// to be in lower case, but it will also make the map look-up easier.
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language = language.toLowerCase();
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language = LanguageUtils.isoMap_.get(language) || language;
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// Convert the region to upper case. It is standard for the region to be in
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// upper case. If there is no upper code, then it will be an empty string
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// and this will be a no-op.
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region = region.toUpperCase();
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return region ?
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language + '-' + region :
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language;
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}
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/**
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* Check if two language codes are siblings. Language codes are siblings if
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* they share the same base language while neither one is the base language.
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*
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* For example, "en-US" and "en-CA" are siblings but "en-US" and "en" are not
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* siblings.
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*
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* @param {string} a
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* @param {string} b
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* @return {boolean}
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*/
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static areSiblings(a, b) {
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const LanguageUtils = shaka.util.LanguageUtils;
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const baseA = LanguageUtils.getBase(a);
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const baseB = LanguageUtils.getBase(b);
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return a != baseA && b != baseB && baseA == baseB;
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}
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/**
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* Compute a numerical relatedness for language codes. Language codes with a
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* higher relatedness are a better match. Unrelated language codes have a
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* relatedness score of 0.
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*
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* @param {string} target
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* @param {string} candidate
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* @return {number}
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*/
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static relatedness(target, candidate) {
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const LanguageUtils = shaka.util.LanguageUtils;
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target = LanguageUtils.normalize(target);
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candidate = LanguageUtils.normalize(candidate);
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// An exact match is the top score.
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if (candidate == target) {
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return 4;
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}
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// Next is a parent of the target language.
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if (LanguageUtils.isParentOf(candidate, target)) {
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return 3;
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}
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// Next is a sibling of the target language.
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if (LanguageUtils.isSiblingOf(candidate, target)) {
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return 2;
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}
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// Next is a child of the target language.
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if (LanguageUtils.isParentOf(target, candidate)) {
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return 1;
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}
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// Otherwise, they are unrelated.
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return 0;
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}
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/**
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* Get the normalized base language for a language code.
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*
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* @param {string} lang
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* @return {string}
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*/
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static getBase(lang) {
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const LanguageUtils = shaka.util.LanguageUtils;
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const splitAt = lang.indexOf('-');
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let major;
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if (splitAt >= 0) {
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major = lang.substring(0, splitAt);
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} else {
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major = lang;
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}
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// Convert the major code to lower case. It is standard for the major code
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// to be in lower case, but it will also make the map look-up easier.
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major = major.toLowerCase();
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major = LanguageUtils.isoMap_.get(major) || major;
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return major;
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}
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/**
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* Get the normalized language of the given text stream. Will return 'und' if
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* a language is not found on the text stream.
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*
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* This should always be used to get the language from a text stream.
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*
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* @param {shaka.extern.Stream} stream
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* @return {string}
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*/
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static getLocaleForText(stream) {
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const LanguageUtils = shaka.util.LanguageUtils;
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const ContentType = shaka.util.ManifestParserUtils.ContentType;
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goog.asserts.assert(
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stream.type == ContentType.TEXT,
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'Can only get language from text streams');
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const language = stream.language || 'und';
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return LanguageUtils.normalize(language);
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}
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/**
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* Get the normalized locale for the given variant. This will look through
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* the variant to find the locale that represents the content in the variant.
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* This will return 'und' if no language can be found.
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*
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* This should always be used to get the locale from a variant.
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*
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* @param {shaka.extern.Variant} variant
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* @return {string}
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*/
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static getLocaleForVariant(variant) {
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const LanguageUtils = shaka.util.LanguageUtils;
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// Our preference order is:
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// 1. Variant
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// 2. Audio Stream
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// 3. Video Stream
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//
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// We are going to consider all falsy strings to be invalid locales, this
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// will include empty strings.
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if (variant.language) {
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return LanguageUtils.normalize(variant.language);
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}
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if (variant.audio && variant.audio.language) {
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return LanguageUtils.normalize(variant.audio.language);
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}
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if (variant.video && variant.video.language) {
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return LanguageUtils.normalize(variant.video.language);
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}
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// No language was found, but we still want to return a valid string.
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return 'und';
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}
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/**
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* Find the locale in |searchSpace| that comes closest to |target|. If no
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* locale is found to be close to |target|, then |null| will be returned.
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*
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* @param {string} target
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* @param {!Iterable.<string>} searchSpace
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* @return {?string}
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*/
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static findClosestLocale(target, searchSpace) {
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const LanguageUtils = shaka.util.LanguageUtils;
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/** @type {string} */
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const safeTarget = LanguageUtils.normalize(target);
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/** @type {!Set.<string>} */
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const safeSearchSpace = new Set();
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for (const option of searchSpace) {
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safeSearchSpace.add(LanguageUtils.normalize(option));
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}
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// Preference 1 - The option is an exact match. For example, "en-US" is an
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// exact match of "en-US". So if there is an option that is an exact
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// match, it would be the best match possible.
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for (const option of safeSearchSpace) {
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if (option == safeTarget) {
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return option;
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}
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}
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// Preference 2 - The option is the parent of the target. For example,
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// "en" is the parent of "en-US". So if there is an option with
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// "en", it should be good enough when our preference is "en-US".
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for (const option of safeSearchSpace) {
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if (LanguageUtils.isParentOf(option, safeTarget)) {
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return option;
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}
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}
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// Preference 3 - The option is a sibling of the target. For example,
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// "en-US" is a sibling of "en-CA". So if there is an option with
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// "en_CA", it should be good enough when our preference is "en-US".
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for (const option of safeSearchSpace) {
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if (LanguageUtils.isSiblingOf(option, safeTarget)) {
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return option;
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}
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}
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// Preference 4 - The option is a child of the target. For example,
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// "en-US" is the child of "en". SO it there is an option with
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// "en-US", it should be good enough when our preference is "en".
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for (const option of safeSearchSpace) {
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if (LanguageUtils.isParentOf(safeTarget, option)) {
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return option;
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}
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}
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// Failed to find anything.
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return null;
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}
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/**
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* Take a locale string and break it into its component. Check that each
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* component matches what we would expect internally for locales. This
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* should ONLY be used to verify locales that have been normalized.
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*
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* @param {string} locale
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* @return {!Array.<string>}
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* @private
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*/
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static disassembleLocale_(locale) {
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const components = locale.split('-');
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goog.asserts.assert(
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components.length <= 2,
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[
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'Locales should not have more than 2 components. ',
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locale,
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' has too many components.',
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].join());
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return components;
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}
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};
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/**
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* A map from 3-letter language codes (ISO 639-2) to 2-letter language codes
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* (ISO 639-1) for all languages which have both in the registry.
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*
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* @const {!Map.<string, string>}
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* @private
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*/
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shaka.util.LanguageUtils.isoMap_ = new Map([
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['aar', 'aa'], ['abk', 'ab'], ['afr', 'af'], ['aka', 'ak'], ['alb', 'sq'],
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['amh', 'am'], ['ara', 'ar'], ['arg', 'an'], ['arm', 'hy'], ['asm', 'as'],
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['ava', 'av'], ['ave', 'ae'], ['aym', 'ay'], ['aze', 'az'], ['bak', 'ba'],
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['bam', 'bm'], ['baq', 'eu'], ['bel', 'be'], ['ben', 'bn'], ['bih', 'bh'],
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['bis', 'bi'], ['bod', 'bo'], ['bos', 'bs'], ['bre', 'br'], ['bul', 'bg'],
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['bur', 'my'], ['cat', 'ca'], ['ces', 'cs'], ['cha', 'ch'], ['che', 'ce'],
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['chi', 'zh'], ['chu', 'cu'], ['chv', 'cv'], ['cor', 'kw'], ['cos', 'co'],
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['cre', 'cr'], ['cym', 'cy'], ['cze', 'cs'], ['dan', 'da'], ['deu', 'de'],
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['div', 'dv'], ['dut', 'nl'], ['dzo', 'dz'], ['ell', 'el'], ['eng', 'en'],
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['epo', 'eo'], ['est', 'et'], ['eus', 'eu'], ['ewe', 'ee'], ['fao', 'fo'],
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['fas', 'fa'], ['fij', 'fj'], ['fin', 'fi'], ['fra', 'fr'], ['fre', 'fr'],
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['fry', 'fy'], ['ful', 'ff'], ['geo', 'ka'], ['ger', 'de'], ['gla', 'gd'],
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['gle', 'ga'], ['glg', 'gl'], ['glv', 'gv'], ['gre', 'el'], ['grn', 'gn'],
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['guj', 'gu'], ['hat', 'ht'], ['hau', 'ha'], ['heb', 'he'], ['her', 'hz'],
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['hin', 'hi'], ['hmo', 'ho'], ['hrv', 'hr'], ['hun', 'hu'], ['hye', 'hy'],
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['ibo', 'ig'], ['ice', 'is'], ['ido', 'io'], ['iii', 'ii'], ['iku', 'iu'],
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['ile', 'ie'], ['ina', 'ia'], ['ind', 'id'], ['ipk', 'ik'], ['isl', 'is'],
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['ita', 'it'], ['jav', 'jv'], ['jpn', 'ja'], ['kal', 'kl'], ['kan', 'kn'],
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['kas', 'ks'], ['kat', 'ka'], ['kau', 'kr'], ['kaz', 'kk'], ['khm', 'km'],
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['kik', 'ki'], ['kin', 'rw'], ['kir', 'ky'], ['kom', 'kv'], ['kon', 'kg'],
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['kor', 'ko'], ['kua', 'kj'], ['kur', 'ku'], ['lao', 'lo'], ['lat', 'la'],
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['lav', 'lv'], ['lim', 'li'], ['lin', 'ln'], ['lit', 'lt'], ['ltz', 'lb'],
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['lub', 'lu'], ['lug', 'lg'], ['mac', 'mk'], ['mah', 'mh'], ['mal', 'ml'],
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['mao', 'mi'], ['mar', 'mr'], ['may', 'ms'], ['mkd', 'mk'], ['mlg', 'mg'],
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['mlt', 'mt'], ['mon', 'mn'], ['mri', 'mi'], ['msa', 'ms'], ['mya', 'my'],
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['nau', 'na'], ['nav', 'nv'], ['nbl', 'nr'], ['nde', 'nd'], ['ndo', 'ng'],
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['nep', 'ne'], ['nld', 'nl'], ['nno', 'nn'], ['nob', 'nb'], ['nor', 'no'],
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['nya', 'ny'], ['oci', 'oc'], ['oji', 'oj'], ['ori', 'or'], ['orm', 'om'],
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['oss', 'os'], ['pan', 'pa'], ['per', 'fa'], ['pli', 'pi'], ['pol', 'pl'],
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['por', 'pt'], ['pus', 'ps'], ['que', 'qu'], ['roh', 'rm'], ['ron', 'ro'],
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['rum', 'ro'], ['run', 'rn'], ['rus', 'ru'], ['sag', 'sg'], ['san', 'sa'],
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['sin', 'si'], ['slk', 'sk'], ['slo', 'sk'], ['slv', 'sl'], ['sme', 'se'],
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['smo', 'sm'], ['sna', 'sn'], ['snd', 'sd'], ['som', 'so'], ['sot', 'st'],
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['spa', 'es'], ['sqi', 'sq'], ['srd', 'sc'], ['srp', 'sr'], ['ssw', 'ss'],
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['sun', 'su'], ['swa', 'sw'], ['swe', 'sv'], ['tah', 'ty'], ['tam', 'ta'],
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['tat', 'tt'], ['tel', 'te'], ['tgk', 'tg'], ['tgl', 'tl'], ['tha', 'th'],
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['tib', 'bo'], ['tir', 'ti'], ['ton', 'to'], ['tsn', 'tn'], ['tso', 'ts'],
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['tuk', 'tk'], ['tur', 'tr'], ['twi', 'tw'], ['uig', 'ug'], ['ukr', 'uk'],
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['urd', 'ur'], ['uzb', 'uz'], ['ven', 've'], ['vie', 'vi'], ['vol', 'vo'],
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['wel', 'cy'], ['wln', 'wa'], ['wol', 'wo'], ['xho', 'xh'], ['yid', 'yi'],
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['yor', 'yo'], ['zha', 'za'], ['zho', 'zh'], ['zul', 'zu'],
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]);
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