switch back to LoveIt, other theme is deprectated

themes/LoveIt/assets/lib/mapbox-gl/mapbox-gl-language.js

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+/**
+ * Create a new [Mapbox GL JS plugin](https://www.mapbox.com/blog/build-mapbox-gl-js-plugins/) that
+ * modifies the layers of the map style to use the `text-field` that matches the browser language.
+ * As of Mapbox GL Language v1.0.0, this plugin no longer supports token values (e.g. `{name}`). v1.0+ expects the `text-field`
+ * property of a style to use an [expression](https://docs.mapbox.com/mapbox-gl-js/style-spec/expressions/) of the form `['get', 'name_en']` or `['get', 'name']`; these expressions can be nested. Note that `get` expressions used as inputs to other expressions may not be handled by this plugin. For example:
+ * ```
+ * ["match",
+ *   ["get", "name"],
+ *   "California",
+ *   "Golden State",
+ *   ["coalesce",
+ *     ["get", "name_en"],
+ *     ["get", "name"]
+ *   ]
+ * ]
+ * ```
+ * Only styles based on [Mapbox v8 styles](https://docs.mapbox.com/help/troubleshooting/streets-v8-migration-guide/) are supported.
+ *
+ * @constructor
+ * @param {object} options - Options to configure the plugin.
+ * @param {string[]} [options.supportedLanguages] - List of supported languages
+ * @param {Function} [options.languageTransform] - Custom style transformation to apply
+ * @param {RegExp} [options.languageField=/^name_/] - RegExp to match if a text-field is a language field
+ * @param {Function} [options.getLanguageField] - Given a language choose the field in the vector tiles
+ * @param {string} [options.languageSource] - Name of the source that contains the different languages.
+ * @param {string} [options.defaultLanguage] - Name of the default language to initialize style after loading.
+ * @param {string[]} [options.excludedLayerIds] - Name of the layers that should be excluded from translation.
+ */
+ function MapboxLanguage(options) {
+  options = Object.assign({}, options);
+  if (!(this instanceof MapboxLanguage)) {
+    throw new Error('MapboxLanguage needs to be called with the new keyword');
+  }
+
+  this.setLanguage = this.setLanguage.bind(this);
+  this._initialStyleUpdate = this._initialStyleUpdate.bind(this);
+
+  this._defaultLanguage = options.defaultLanguage;
+  this._isLanguageField = options.languageField || /^name_/;
+  this._getLanguageField = options.getLanguageField || function nameField(language) {
+    return language === 'mul' ? 'name' : `name_${language}`;
+  };
+  this._languageSource = options.languageSource || null;
+  this._languageTransform = options.languageTransform;
+  this._excludedLayerIds = options.excludedLayerIds || [];
+  this.supportedLanguages = options.supportedLanguages || ['ar', 'de', 'en', 'es', 'fr', 'it', 'ja', 'ko', 'mul', 'pt', 'ru', 'vi', 'zh-Hans', 'zh-Hant'];
+}
+
+const isTokenField = /^\{name/;
+function isFlatExpressionField(isLangField, property) {
+  const isGetExpression = Array.isArray(property) && property[0] === 'get';
+  if (isGetExpression && isTokenField.test(property[1])) {
+    console.warn('This plugin no longer supports the use of token syntax (e.g. {name}). Please use a get expression. See https://docs.mapbox.com/mapbox-gl-js/style-spec/expressions/ for more details.');
+  }
+
+  return isGetExpression && isLangField.test(property[1]);
+}
+
+function adaptNestedExpressionField(isLangField, property, languageFieldName) {
+  if (Array.isArray(property)) {
+    for (let i = 1; i < property.length; i++) {
+      if (Array.isArray(property[i])) {
+        if (isFlatExpressionField(isLangField, property[i])) {
+          property[i][1] = languageFieldName;
+        }
+        adaptNestedExpressionField(isLangField, property[i], languageFieldName);
+      }
+    }
+  }
+}
+
+function adaptPropertyLanguage(isLangField, property, languageFieldName) {
+  if (isFlatExpressionField(isLangField, property)) {
+    property[1] = languageFieldName;
+  }
+
+  adaptNestedExpressionField(isLangField, property, languageFieldName);
+
+  // handle special case of bare ['get', 'name'] expression by wrapping it in a coalesce statement
+  if (property[0] === 'get' && property[1] === 'name') {
+    const defaultProp = property.slice();
+    const adaptedProp = ['get', languageFieldName];
+    property = ['coalesce', adaptedProp, defaultProp];
+  }
+
+  return property;
+}
+
+function changeLayerTextProperty(isLangField, layer, languageFieldName, excludedLayerIds) {
+  if (layer.layout && layer.layout['text-field'] && excludedLayerIds.indexOf(layer.id) === -1) {
+    return Object.assign({}, layer, {
+      layout: Object.assign({}, layer.layout, {
+        'text-field': adaptPropertyLanguage(isLangField, layer.layout['text-field'], languageFieldName)
+      })
+    });
+  }
+  return layer;
+}
+
+function findStreetsSource(style) {
+  const sources = Object.keys(style.sources).filter((sourceName) => {
+    const url = style.sources[sourceName].url;
+    // the source URL can reference the source version or the style version
+    // this check and the error forces users to migrate to styles using source version 8
+    return url && url.indexOf('mapbox.mapbox-streets-v8') > -1 || /mapbox-streets-v[1-9][1-9]/.test(url);
+  });
+  if (!sources.length) throw new Error('If using MapboxLanguage with a Mapbox style, the style must be based on vector tile version 8, e.g. "streets-v11"');
+  return sources[0];
+}
+
+/**
+ * Explicitly change the language for a style.
+ * @param {object} style - Mapbox GL style to modify
+ * @param {string} language - The language iso code
+ * @returns {object} the modified style
+ */
+MapboxLanguage.prototype.setLanguage = function (style, language) {
+  if (this.supportedLanguages.indexOf(language) < 0) throw new Error(`Language ${  language  } is not supported`);
+  const streetsSource = this._languageSource || findStreetsSource(style);
+  if (!streetsSource) return style;
+
+  const field = this._getLanguageField(language);
+  const isLangField = this._isLanguageField;
+  const excludedLayerIds = this._excludedLayerIds;
+  const changedLayers = style.layers.map((layer) => {
+    if (layer.source === streetsSource) return changeLayerTextProperty(isLangField, layer, field, excludedLayerIds);
+    return layer;
+  });
+
+  const languageStyle = Object.assign({}, style, {
+    layers: changedLayers
+  });
+
+  return this._languageTransform ? this._languageTransform(languageStyle, language) : languageStyle;
+};
+
+MapboxLanguage.prototype._initialStyleUpdate = function () {
+  const style = this._map.getStyle();
+  const language = this._defaultLanguage || browserLanguage(this.supportedLanguages);
+
+  this._map.setStyle(this.setLanguage(style, language));
+};
+
+function browserLanguage(supportedLanguages) {
+  const language = navigator.languages ? navigator.languages[0] : (navigator.language || navigator.userLanguage);
+  const parts = language && language.split('-');
+  let languageCode = language;
+  if (parts.length > 1) {
+    languageCode = parts[0];
+  }
+  if (supportedLanguages.indexOf(languageCode) > -1) {
+    return languageCode;
+  }
+  return null;
+}
+
+MapboxLanguage.prototype.onAdd = function (map) {
+  this._map = map;
+  this._map.on('style.load', this._initialStyleUpdate);
+  this._container = document.createElement('div');
+  return this._container;
+};
+
+MapboxLanguage.prototype.onRemove = function () {
+  this._map.off('style.load', this._initialStyleUpdate);
+  this._map = undefined;
+};
+
+if (typeof module !== 'undefined' && typeof module.exports !== 'undefined') {
+  module.exports = MapboxLanguage;
+} else {
+  window.MapboxLanguage = MapboxLanguage;
+}