use maintained theme
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/**
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* Create a new [Mapbox GL JS plugin](https://www.mapbox.com/blog/build-mapbox-gl-js-plugins/) that
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* modifies the layers of the map style to use the 'text-field' that matches the browser language.
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* @constructor
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* @param {object} options - Options to configure the plugin.
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* @param {string[]} [options.supportedLanguages] - List of supported languages
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* @param {Function} [options.languageTransform] - Custom style transformation to apply
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* @param {RegExp} [options.languageField=/^\{name/] - RegExp to match if a text-field is a language field
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* @param {Function} [options.getLanguageField] - Given a language choose the field in the vector tiles
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* @param {string} [options.languageSource] - Name of the source that contains the different languages.
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* @param {string} [options.defaultLanguage] - Name of the default language to initialize style after loading.
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* @param {string[]} [options.excludedLayerIds] - Name of the layers that should be excluded from translation.
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*/
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function MapboxLanguage(options) {
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options = Object.assign({}, options);
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if (!(this instanceof MapboxLanguage)) {
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throw new Error('MapboxLanguage needs to be called with the new keyword');
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}
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this.setLanguage = this.setLanguage.bind(this);
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this._initialStyleUpdate = this._initialStyleUpdate.bind(this);
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this._defaultLanguage = options.defaultLanguage;
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this._isLanguageField = options.languageField || /^\{name/;
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this._getLanguageField = options.getLanguageField || function nameField(language) {
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return language === 'mul' ? '{name}' : '{name_' + language + '}';
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};
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this._languageSource = options.languageSource || null;
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this._languageTransform = options.languageTransform || function (style, language) {
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if (language === 'ar') {
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return noSpacing(style);
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} else {
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return standardSpacing(style);
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}
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};
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this._excludedLayerIds = options.excludedLayerIds || [];
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this.supportedLanguages = options.supportedLanguages || ['ar', 'en', 'es', 'fr', 'de', 'ja', 'ko', 'mul', 'pt', 'ru', 'zh'];
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}
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function standardSpacing(style) {
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var changedLayers = style.layers.map(function (layer) {
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if (!(layer.layout || {})['text-field']) return layer;
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var spacing = 0;
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if (layer['source-layer'] === 'state_label') {
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spacing = 0.15;
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}
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if (layer['source-layer'] === 'marine_label') {
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if (/-lg/.test(layer.id)) {
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spacing = 0.25;
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}
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if (/-md/.test(layer.id)) {
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spacing = 0.15;
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}
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if (/-sm/.test(layer.id)) {
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spacing = 0.1;
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}
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}
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if (layer['source-layer'] === 'place_label') {
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if (/-suburb/.test(layer.id)) {
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spacing = 0.15;
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}
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if (/-neighbour/.test(layer.id)) {
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spacing = 0.1;
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}
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if (/-islet/.test(layer.id)) {
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spacing = 0.01;
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}
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}
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if (layer['source-layer'] === 'airport_label') {
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spacing = 0.01;
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}
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if (layer['source-layer'] === 'rail_station_label') {
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spacing = 0.01;
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}
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if (layer['source-layer'] === 'poi_label') {
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if (/-scalerank/.test(layer.id)) {
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spacing = 0.01;
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}
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}
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if (layer['source-layer'] === 'road_label') {
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if (/-label-/.test(layer.id)) {
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spacing = 0.01;
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}
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if (/-shields/.test(layer.id)) {
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spacing = 0.05;
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}
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}
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return Object.assign({}, layer, {
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layout: Object.assign({}, layer.layout, {
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'text-letter-spacing': spacing
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})
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});
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});
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return Object.assign({}, style, {
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layers: changedLayers
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});
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}
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function noSpacing(style) {
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var changedLayers = style.layers.map(function (layer) {
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if (!(layer.layout || {})['text-field']) return layer;
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var spacing = 0;
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return Object.assign({}, layer, {
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layout: Object.assign({}, layer.layout, {
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'text-letter-spacing': spacing
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})
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});
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});
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return Object.assign({}, style, {
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layers: changedLayers
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});
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}
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function isNameStringField(isLangField, property) {
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return typeof property === 'string' && isLangField.test(property);
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}
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function isNameFunctionField(isLangField, property) {
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return property.stops && property.stops.filter(function (stop) {
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return isLangField.test(stop[1]);
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}).length > 0;
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}
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function adaptPropertyLanguage(isLangField, property, languageFieldName) {
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if (isNameStringField(isLangField, property)) return languageFieldName;
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if (isNameFunctionField(isLangField, property)) {
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var newStops = property.stops.map(function (stop) {
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if (isLangField.test(stop[1])) {
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return [stop[0], languageFieldName];
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}
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return stop;
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});
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return Object.assign({}, property, {
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stops: newStops
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});
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}
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return property;
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}
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function changeLayerTextProperty(isLangField, layer, languageFieldName, excludedLayerIds) {
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if (layer.layout && layer.layout['text-field'] && excludedLayerIds.indexOf(layer.id) === -1) {
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return Object.assign({}, layer, {
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layout: Object.assign({}, layer.layout, {
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'text-field': adaptPropertyLanguage(isLangField, layer.layout['text-field'], languageFieldName)
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})
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});
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}
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return layer;
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}
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function findStreetsSource(style) {
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var sources = Object.keys(style.sources).filter(function (sourceName) {
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var source = style.sources[sourceName];
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return /mapbox-streets-v\d/.test(source.url);
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});
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return sources[0];
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}
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/**
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* Explicitly change the language for a style.
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* @param {object} style - Mapbox GL style to modify
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* @param {string} language - The language iso code
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* @returns {object} the modified style
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*/
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MapboxLanguage.prototype.setLanguage = function (style, language) {
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if (this.supportedLanguages.indexOf(language) < 0) throw new Error('Language ' + language + ' is not supported');
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var streetsSource = this._languageSource || findStreetsSource(style);
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if (!streetsSource) return style;
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var field = this._getLanguageField(language);
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var isLangField = this._isLanguageField;
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var excludedLayerIds = this._excludedLayerIds;
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var changedLayers = style.layers.map(function (layer) {
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if (layer.source === streetsSource) return changeLayerTextProperty(isLangField, layer, field, excludedLayerIds);
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return layer;
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});
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var languageStyle = Object.assign({}, style, {
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layers: changedLayers
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});
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return this._languageTransform(languageStyle, language);
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};
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MapboxLanguage.prototype._initialStyleUpdate = function () {
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var style = this._map.getStyle();
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var language = this._defaultLanguage || browserLanguage(this.supportedLanguages);
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// We only update the style once
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this._map.off('styledata', this._initialStyleUpdate);
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this._map.setStyle(this.setLanguage(style, language));
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};
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function browserLanguage(supportedLanguages) {
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var language = navigator.languages ? navigator.languages[0] : (navigator.language || navigator.userLanguage);
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var parts = language.split('-');
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var languageCode = language;
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if (parts.length > 1) {
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languageCode = parts[0];
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}
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if (supportedLanguages.indexOf(languageCode) > -1) {
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return languageCode;
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}
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return null;
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}
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MapboxLanguage.prototype.onAdd = function (map) {
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this._map = map;
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this._map.on('styledata', this._initialStyleUpdate);
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this._container = document.createElement('div');
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return this._container;
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};
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MapboxLanguage.prototype.onRemove = function () {
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this._map.off('styledata', this._initialStyleUpdate);
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this._map = undefined;
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};
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function ie11Polyfill() {
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if (typeof Object.assign != 'function') {
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// Must be writable: true, enumerable: false, configurable: true
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Object.defineProperty(Object, 'assign', {
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// eslint-disable-next-line no-unused-vars
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value: function assign(target, varArgs) { // .length of function is 2
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// eslint-disable-next-line strict
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'use strict';
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if (target === null) { // TypeError if undefined or null
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throw new TypeError('Cannot convert undefined or null to object');
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}
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var to = Object(target);
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for (var index = 1; index < arguments.length; index++) {
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var nextSource = arguments[index];
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if (nextSource !== null) { // Skip over if undefined or null
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for (var nextKey in nextSource) {
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// Avoid bugs when hasOwnProperty is shadowed
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if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
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to[nextKey] = nextSource[nextKey];
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}
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}
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}
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}
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return to;
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},
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writable: true,
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configurable: true
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});
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}
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}
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if (typeof module !== 'undefined' && typeof module.exports !== 'undefined') {
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module.exports = MapboxLanguage;
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} else {
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ie11Polyfill();
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window.MapboxLanguage = MapboxLanguage;
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}
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