i18n: Massive rework to modernize features
* Added support for multiple base languages. * Added support for per-language base languages. * Added caching for language translation chain. * Changed language functionality to allow creating, loading, saving and destroying a language. * Added functionality to set, get and clear keys for a language. * Added functionality to override resolver and applier for domTranslate (previously autoTranslate).
This commit is contained in:
Michael Fabian 'Xaymar' Dirks
committed by
Michael Fabian Dirks
Michael Fabian Dirks
parent
a3604e7a22
commit
44cf17a348
@@ -15,152 +15,536 @@
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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let group = "i18n";
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let group_style = "font-weight: bold;";
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let text_style = "font-weight: inherit;";
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/*
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Dead Simple I18n Library
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Languages are stored in a Map() to allow for any kind of name to be used. In
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addition to that there is a global base language, and each language can
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specify an override base language which will be used only if that language
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is actually loaded during translation. The base language can be an array
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instead of a string, in which each language is tested in order of appearance.
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The key can only be a string, while the Value is allowed to be anything. In
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case you want to implement pluralization in your translation layer, you would
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be doing it with an object value or similar. This creates a simple structure
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that can be used for various kinds of translations, and is as fast as the
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underlying Map implementation.
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# Example: Evaluation of the language chain [en-US < en-GB < de-DE < de-BE]
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Searching for the key will first happen in de-BE, then in de-DE, then in en-GB
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and finally in en-US. If de-BE, de-DE or en-GB is not loaded, that specific
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lookup step skips straight to the global base language, in this case en-US. If
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en-US is not loaded, the original i18n key is returned instead.
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# Example: Evaluation of the language chain [en-US < en-GB < de-DE, en-GB < de-BE]
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Checks first happen in de-BE, if de-BE does not have the key checks move on to
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de-DE. If de-DE is not loaded, en-GB is instead checked. If de-DE does not
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have the key, checks progress to en-GB. If en-GB does not have the key, checks
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progress to en-US. If any of them are not loaded or does not have the key, the
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next language in the base languages is checked, until the base languages are
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exhausted, in which case the i18n key is returned.
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# Structure
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Map{
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languageName: Map{
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// Base language override (optional)
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_base: {string},
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// Key Value storage for lookup
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{string key}: {any value},
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}
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}
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# Internal behavior
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The library will build a chain of languages to check in a loop for, to avoid
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costly recursive calls that aren't well protected against loops in base
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language definitions (i.e. de-DE depends on en-GB, en-GB depends on de-DE).
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This cache is refreshed when first attempting to translate to that language,
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and flagged as dirty every time a language is loaded or a base language is
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changed.
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*/
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let group = 'i18n';
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let group_style = 'font-weight: bold;';
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let text_style = 'font-weight: inherit;';
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class I18n {
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/** Create a new object, ready to be used.
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*
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* @param {string} urlFormat URL from which to asynchronously load translation data from in the format 'url/file{0}.extension' ({0} is replaced by the lowercase language name).
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* @param {string} language Initial base language to base all translations on.
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* @param {string} baseLanguageKey Key to use for base language overrides. (Default = _base)
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* @throws Exception on invalid parameters.
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*/
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constructor(urlFormat) {
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console.log("%c[%s]%c Initializing ...", group_style, group, text_style);
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if (typeof(urlFormat) != "string") {
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throw "urlFormat must be of type string";
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constructor(language, baseLanguageKey = '_base') {
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this._sanitizeLanguage(language);
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this._verifyKey(baseLanguageKey);
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console.log('%c[%s]%c Initializing ...', group_style, group, text_style);
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this.languages = new Map();
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this.chains = new Map();
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this.baseLanguage = language;
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this.baseLanguageKey = baseLanguageKey;
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this.dirtyTs = performance.now();
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this.chainsTs = performance.now();
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}
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_verifyLanguageKnown(language) {
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if (!this.languages.has(language)) {
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throw 'language unknown';
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}
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this.url = urlFormat;
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this.languages = {};
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this.languages.base = '';
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}
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_verifyKey(key) {
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if (typeof (key) == 'string') {
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return;
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}
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throw 'key must be of type string';
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}
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_verifyKeyKnown(language, key) {
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this._verifyLanguageKnown(language);
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this._verifyKey(key);
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if (!this.languages.get(language).has(key)) {
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throw 'key unknown in language';
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}
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}
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_verifyData(data) {
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if (typeof (data) == 'string') {
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return;
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}
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if (typeof (data) == 'object') {
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return;
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}
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if (data instanceof File) {
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return;
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}
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if (data instanceof Blob) {
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return;
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}
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throw 'data must be of type string, object, File or Blob';
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}
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_sanitizeLanguage(language) {
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if (typeof(language) != "string") {
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throw "language must be of type string";
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try {
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this._verifyKey(language);
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} catch (e) {
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throw 'language must be of type string';
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}
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return language.toLowerCase();
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}
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_defaultResolver(language, key, element) {
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return this.translate(key, language);
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}
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_defaultApplier(language, key, translation, element) {
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try {
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element.textContent = translation;
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return true;
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} catch (e) {
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return false;
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}
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}
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/** Caches the necessary language chain for translation.
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*
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* Creates and returns a language chain required for translation, avoiding
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* recursive loops that never end in the process. The chain will not
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* evalute the entire branch first, instead it will check all branches
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* and then list the childs of those branches. This is an expensive
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* operation and should only be done once on every language update.
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*
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* Example:
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* de-DE +- en-GB - en-US - de-DE (- en-GB, en-US, ... [recursive])
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* \- en-US - de-DE (- en-GB, en-US, ... [recursive])
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* Result: [de-DE, en-GB, en-US]
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* Explanation: de-DE depends on both en-GB and en-US, and will check both
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* before considering the next branch. Since all dependencies are resolved
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* early, a recursive lookup is prevented here.
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*
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* Example:
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*
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*
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* @param {string} language
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* @returns {array} Translation chain
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*/
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_cacheChain(language) {
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// This caches a chain so that we do not have to rebuild this every
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// lookup. It is important that there are no recursive loops in this
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// code, which means we can't rely on this function to work until the
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// cache is completed.
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// Have there been changes to the timestamp?
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if (this.chainsTs < this.dirtyTs) {
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// If yes, clear all chains for rebuilding.
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this.chainsTs = this.dirtyTs;
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this.chains.clear();
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}
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// Do we have a chain cached?
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if (this.languageChains.has(language)) {
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// Yes, return the cached chain and go back to translation.
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return this.languageChains.get(language);
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}
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// Create a new chain without relying on our own function.
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let chain = [language]; // Chains always contain the language itself.
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// Now we walk through the chain manually, modifying it as we go.
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for (let pos = 0; pos < chain.length; pos++) {
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// Check if the language is loaded, if not skip it.
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if (!this.languages.has(chain[pos])) {
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continue;
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}
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let languageMap = this.languages.get(chain[pos]);
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// Check if there is a base language override.
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if (!languageMap.has(this.baseLanguageKey)) {
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continue;
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}
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// If yes, walk it.
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let baseLanguages = languageMap.get(this.baseLanguageKey);
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if (typeof (baseLanguages) == 'string') {
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baseLanguages = [baseLanguages];
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} else if (typeof (baseLanguages) == 'array') {
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} else {
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continue;
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}
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for (baseLanguage in baseLanguages) {
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if (!chain.includes(baseLanguage)) {
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chain = chain.push(baseLanguage);
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}
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}
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}
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// We are now through with the actual language chain, so we now have to check for the base language chain.
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// The logic for this is identical to the above.
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let baseChain = this.baseLanguage;
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if (typeof (this.baseLanguage) == 'string') {
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baseChain = [baseChain];
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}
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for (let pos = 0; pos < baseChain.length; pos++) {
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// Check if the language is loaded, if not skip it.
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if (!this.languages.has(baseChain[pos])) {
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continue;
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}
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let languageMap = this.languages.get(baseChain[pos]);
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// Check if there is a base language override.
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if (!languageMap.has(this.baseLanguageKey)) {
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continue;
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}
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// If yes, walk it.
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let baseLanguages = languageMap.get(this.baseLanguageKey);
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if (typeof (baseLanguages) == 'string') {
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baseLanguages = [baseLanguages];
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} else if (typeof (baseLanguages) == 'array') {
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} else {
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continue;
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}
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for (baseLanguage in baseLanguages) {
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if ((!chain.includes(baseLanguage)) && (!baseChain.includes(baseLanguage))) {
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baseChain = baseChain.push(baseLanguage);
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}
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}
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}
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// Concat normal walk and base chain walk.
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chain = chain.concat(baseChain);
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// Store.
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this.chains.set(language, chain);
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// Return.
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return chain;
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}
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/** Create a new language.
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*
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* @param {string} language Name of the language.
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* @throws Exception on invalid parameters.
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*/
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createLanguage(language) {
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language = this._sanitizeLanguage(language);
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console.debug('%c[%s]%c Creating language "%s"...',
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group_style, group, text_style,
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language);
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this.languages.set(language, new Map());
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console.debug('%c[%s]%c Created language "%s".',
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group_style, group, text_style,
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language);
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this.dirtyTs = performance.now();
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}
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/** Load a new language.
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*
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* @param {string} language Name of the language file.
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* @param {boolean} isBaseLanguage Use this language as the new base language.
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* @param {string} language Name of the language.
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* @param {File/Blob/object/string} data Data containing a JSON representation of the language.
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* @param {string} encoding (Optional) Encoding to use when reading File or Blob.
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* @returns {Promise}
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* @throws Exception on invalid parameters or invalid data.
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*/
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load(language, isBaseLanguage) {
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loadLanguage(language, data, encoding = 'utf-8') {
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// Verify input.
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language = this._sanitizeLanguage(language);
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if (isBaseLanguage == true) {
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this.languages.base = language;
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}
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if (this.languages[language] == undefined) {
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return new Promise((resolve, reject) => {
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let self = this;
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let url = this.url.replace('{0}', language);
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console.debug("%c[%s]%c Loading language '%s' from url '%s'...",
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_verifyData(data);
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return new Promise(async (resolve, reject) => {
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console.debug('%c[%s]%c Loading language "%s"...',
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group_style, group, text_style,
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language);
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try {
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let json_data;
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// Decode File, Blob and string to JSON object.
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if ((data instanceof File) || (data instanceof Blob)) {
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await new Promise((resolve2, reject2) => {
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let freader = new FileReader();
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freader.onload((ev) => {
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resolve2();
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});
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freader.onabort((ev) => {
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reject2(ev);
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});
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freader.onerror((ev) => {
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reject2(ev);
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});
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freader.readAsText(data, encoding);
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});
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json_data = JSON.parse(freader.result);
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} else if (typeof (data) == 'string') {
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json_data = JSON.parse(data);
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} else if (typeof (data) == 'object') {
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json_data = data;
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}
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let language_map = new Map();
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for (key in json_data) {
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language_map.set(key, json_data[key]);
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}
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this.languages.set(language, language_map);
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this.dirtyTs = performance.now();
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console.debug('%c[%s]%c Loaded language "%s".',
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group_style, group, text_style, language);
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resolve(language);
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} catch (e) {
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console.error('%c[%s]%c Failed to load language "%s": %o',
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group_style, group, text_style,
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language, url);
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language, e);
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reject(e);
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return;
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}
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});
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}
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let req = new XMLHttpRequest();
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req.addEventListener("error", function (event) {
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console.log("%c[%s]%c Failed to load language '%s': ",
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group_style, group, text_style,
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language, event);
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/** Save a language.
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*
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* @param {string} language Name of the language.
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* @returns {Promise} Promise that eventually returns the JSON data of the language.
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* @throws Exception on invalid parameters and missing language.
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*/
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saveLanguage(language) {
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language = this._sanitizeLanguage(language);
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this._verifyLanguageKnown(language);
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});
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req.addEventListener("progress", function (event) {
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let prc = event.loaded / event.total;
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if (event.loaded == event.total) {
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prc = 100.0;
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}
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if (event.total == 0) {
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prc = 0.0;
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}
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console.debug("%c[%s]%c Loading language '%s'... [%6.2f%%]",
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group_style, group, text_style,
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language, prc);
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});
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req.addEventListener("load", function (event) {
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console.debug("%c[%s]%c Parsing language '%s'...",
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group_style, group, text_style,
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language);
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try {
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self.languages[language] = JSON.parse(req.responseText);
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} catch (e) {
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console.log("%c[%s]%c Failed to load language '%s': ",
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group_style, group, text_style,
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language, e);
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reject(e);
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return;
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}
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resolve(true);
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console.log("%c[%s]%c Loaded language '%s'.",
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group_style, group, text_style,
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language);
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return;
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});
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req.open("GET", url);
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req.overrideMimeType("text/plain; charset=utf-8");
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req.send();
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return new Promise((resolve, reject) => {
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console.debug('%c[%s]%c Saving language "%s"...',
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group_style, group, text_style,
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language);
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this._verifyLanguageKnown(language);
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let language_data = {};
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let language_map = this.languages.get(language);
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language_map.forEach((value, key, map) => {
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language_data[key] = value;
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});
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} else {
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console.log("%c[%s]%c Loaded language '%s'...",
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group_style, group, text_style, language);
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return new Promise((resolve, reject) => { resolve(true); });
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let json_data = JSON.stringify(language_data);
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console.debug('%c[%s]%c Saved language "%s".',
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group_style, group, text_style,
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language);
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resolve(json_data);
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});
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}
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/** Destroy/unload a language.
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*
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* @param {string} language Name of the language.
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* @throws Exception on invalid parameters and missing language.
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*/
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destroyLanguage(language) {
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language = this._sanitizeLanguage(language);
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this._verifyLanguageKnown(language);
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console.debug('%c[%s]%c Destroying language "%s"...',
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group_style, group, text_style,
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language);
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this.languages.delete(language);
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this.dirtyTs = performance.now();
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console.debug('%c[%s]%c Destroyed language "%s".',
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group_style, group, text_style,
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language);
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}
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/** Clear a key from a language.
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*
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* @param {string} language Language to edit.
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* @param {string} key Key to clear.
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* @return {bool} true on success.
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* @throws Exception on invalid parameters and missing language.
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*/
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clearKey(language, key) {
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// Verify and sanitize input.
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language = this._sanitizeLanguage(language);
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this._verifyKey(key);
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// Check if language exists.
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this._verifyLanguageKnown(language);
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// Delete key if exists.
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let language_map = this.languages.get(language);
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if (!language_map.has(key)) {
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return false;
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}
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language_map.delete(key);
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// If the key was the base language key, set dirty timestamp.
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if (key == this.baseLanguageKey) {
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this.dirtyTs = performance.now();
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
/** Set a key in a language
|
||||
*
|
||||
* @param {string} language Language to edit.
|
||||
* @param {string} key Key to set.
|
||||
* @param {*} value New value to set.
|
||||
* @param {bool} force Force the update if the key exists. (Default = true)
|
||||
* @return {bool} true on success.
|
||||
* @throws Exception on invalid parameters and missing language.
|
||||
*/
|
||||
setKey(language, key, value, force = true) {
|
||||
// Verify and sanitize input.
|
||||
language = this._sanitizeLanguage(language);
|
||||
this._verifyKey(key);
|
||||
|
||||
// Check if language exists.
|
||||
this._verifyLanguageKnown(language);
|
||||
|
||||
// Set key.
|
||||
let language_map = this.languages.get(language);
|
||||
if ((language_map.has(key)) && !force) {
|
||||
return false;
|
||||
}
|
||||
language_map.set(key, value);
|
||||
|
||||
// If the key was the base language key, set dirty timestamp.
|
||||
if (key == this.baseLanguageKey) {
|
||||
this.dirtyTs = performance.now();
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
/** Get a key in a language
|
||||
*
|
||||
* @param {string} language
|
||||
* @param {string} key
|
||||
* @return {*} the value
|
||||
* @throws Exception on invalid parameters, missing language and missing key.
|
||||
*/
|
||||
getKey(language, key) {
|
||||
// Verify and sanitize input.
|
||||
language = this._sanitizeLanguage(language);
|
||||
this._verifyKeyKnown(language, key);
|
||||
|
||||
// Get Key
|
||||
let language_map = this.languages.get(language);
|
||||
return language_map.get(key);
|
||||
}
|
||||
|
||||
/** Translate a single string to any loaded language.
|
||||
*
|
||||
* @param {string} string String to translate
|
||||
* @param {string} key String to translate
|
||||
* @param {string} language Language to translate to
|
||||
* @return {string} Translated string, or if failed the string plus the language appended.
|
||||
* @throws Exception on invalid parameters.
|
||||
*/
|
||||
translate(string, language) {
|
||||
translate(key, language) {
|
||||
// Verify and sanitize input.
|
||||
language = this._sanitizeLanguage(language);
|
||||
if (typeof(string) != "string") {
|
||||
throw "string must be of type string";
|
||||
}
|
||||
let str = this.languages[language][string];
|
||||
if (str == undefined) {
|
||||
let str = this.languages[this.languages.base][string];
|
||||
if (str == undefined) {
|
||||
console.error("%c[%s]%c Language '%s' and base language '%s' contain no translation for '%s'.",
|
||||
group_style, group, text_style,
|
||||
language, this.languages.base, string
|
||||
)
|
||||
return string + language;
|
||||
} else {
|
||||
console.debug("%c[%s]%c Language '%s' contains no translation for '%s', falling back to base language '%s'.",
|
||||
group_style, group, text_style,
|
||||
language, string, this.languages.base
|
||||
)
|
||||
return str;
|
||||
this._verifyKey(key);
|
||||
|
||||
// Translate using the translation chain.
|
||||
let chain = this._cacheChain(language);
|
||||
let translated = key;
|
||||
for (language in chain) {
|
||||
let languageMap = this.languages.get(language);
|
||||
if (languageMap.has(key)) {
|
||||
translated = languageMap.get(key);
|
||||
break;
|
||||
}
|
||||
} else {
|
||||
return str;
|
||||
}
|
||||
|
||||
return translated;
|
||||
}
|
||||
|
||||
/** Automatically translate the entire page using the specified property on elements.
|
||||
*
|
||||
* @param {*} language Language to translate to
|
||||
* @param {*} property Property to search for (default 'data-i18n')
|
||||
* @param {string} language Language to translate to
|
||||
* @param {string} property Property to search for (default 'data-i18n')
|
||||
* @param {function} resolver Function to call to find the proper translation, called with parameters ({string}language, {string}key, {Node}element) and must return a string.
|
||||
* @param {function} applier Function to call to apply the proper translation, called with parameters ({string}language, {string}key, {string}translation, {Node}element) and must return a boolean.
|
||||
* @returns {Promise} resolved when successful, rejected if applier returns false.
|
||||
* @throws Exception on invalid parameters.
|
||||
*/
|
||||
autoTranslate(language, property = 'data-i18n') {
|
||||
domTranslate(language, property = 'data-i18n', resolver = this._defaultResolver, applier = this._defaultApplier) {
|
||||
language = this._sanitizeLanguage(language);
|
||||
if (typeof (resolver) != 'function') {
|
||||
throw 'resolver must be a function';
|
||||
}
|
||||
if (typeof (applier) != 'function') {
|
||||
throw 'applier must be a function';
|
||||
}
|
||||
|
||||
return new Promise((resolve, reject) => {
|
||||
console.debug("%c[%s]%c Starting automatic translation to language '%s'...",
|
||||
console.debug('%c[%s]%c Starting DOM translation to language "%s" using property "%s"...',
|
||||
group_style, group, text_style,
|
||||
language);
|
||||
language, property);
|
||||
|
||||
let els = document.querySelectorAll(`[${property}]`);
|
||||
for (let el of els) {
|
||||
let string = el.getAttribute(property);
|
||||
el.textContent = string;
|
||||
el.textContent = this.translate(string, language);
|
||||
let key = el.getAttribute(property);
|
||||
if (!applier(language, key, resolver(language, key, el), el)) {
|
||||
reject();
|
||||
return;
|
||||
}
|
||||
}
|
||||
console.log("%c[%s]%c Translated to language '%s'.",
|
||||
console.log('%c[%s]%c Translated to language "%s".',
|
||||
group_style, group, text_style,
|
||||
language);
|
||||
resolve();
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user