kepler.gl
Version:
kepler.gl is a webgl based application to visualize large scale location data in the browser
244 lines (199 loc) • 23.7 kB
JavaScript
;
var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.readFile = readFile;
exports.getFileHandler = getFileHandler;
exports.getFileType = getFileType;
exports.loadCsv = loadCsv;
exports.loadJSON = loadJSON;
exports.readJSONFile = readJSONFile;
exports.isGeoJson = isGeoJson;
exports.isFeature = isFeature;
exports.isFeatureCollection = isFeatureCollection;
exports.isRowObject = isRowObject;
exports.isKeplerGlMap = isKeplerGlMap;
exports.determineJsonProcess = determineJsonProcess;
exports.filesToDataPayload = filesToDataPayload;
var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));
var _toConsumableArray2 = _interopRequireDefault(require("@babel/runtime/helpers/toConsumableArray"));
var _window = require("global/window");
var _console = _interopRequireDefault(require("global/console"));
var _dataProcessor = require("./data-processor");
var _utils = require("../utils/utils");
var _defaultSettings = require("../constants/default-settings");
function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }
function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { (0, _defineProperty2["default"])(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }
var FILE_HANDLERS = {
csv: loadCsv,
json: loadJSON
};
function readFile(_ref) {
var file = _ref.file,
_ref$fileCache = _ref.fileCache,
fileCache = _ref$fileCache === void 0 ? [] : _ref$fileCache;
return new Promise(function (resolve, reject) {
var _getFileHandler = getFileHandler(file),
handler = _getFileHandler.handler,
format = _getFileHandler.format;
if (!handler) {
_console["default"].warn("Canont determine file handler for file ".concat(file.name, ". It must have a valid file extension"));
resolve(fileCache);
}
handler({
file: file,
format: format
}).then(function (result) {
if (!result || !result.data) {
// return fileCache, to keep process other files
resolve(fileCache);
}
resolve([].concat((0, _toConsumableArray2["default"])(fileCache), [{
data: result.data,
info: {
label: file.name,
format: result.format
}
}]));
});
});
}
function getFileHandler(fileBlob) {
var type = getFileType(fileBlob.name);
return {
handler: FILE_HANDLERS[type],
format: type
};
}
function getFileType(filename) {
if (filename.endsWith('csv')) {
return 'csv';
} else if (filename.endsWith('json') || filename.endsWith('geojson')) {
// Read GeoJson from browser
return 'json';
} // Wait to add other file type handler
return 'other';
}
function readCSVFile(fileBlob) {
return new Promise(function (resolve, reject) {
var fileReader = new _window.FileReader();
fileReader.onload = function (_ref2) {
var result = _ref2.target.result;
resolve(result);
};
fileReader.readAsText(fileBlob);
});
}
function loadCsv(_ref3) {
var file = _ref3.file,
format = _ref3.format,
_ref3$processor = _ref3.processor,
processor = _ref3$processor === void 0 ? _dataProcessor.processCsvData : _ref3$processor;
return readCSVFile(file).then(function (rawData) {
return rawData ? {
data: processor(rawData),
format: format
} : null;
});
}
function loadJSON(_ref4) {
var file = _ref4.file,
_ref4$processor = _ref4.processor,
processor = _ref4$processor === void 0 ? _dataProcessor.processGeojson : _ref4$processor;
return readJSONFile(file).then(function (content) {
if (isKeplerGlMap(content)) {
return {
format: _defaultSettings.DATASET_FORMATS.keplergl,
data: (0, _dataProcessor.processKeplerglJSON)(content)
};
} else if (isRowObject(content)) {
return {
format: _defaultSettings.DATASET_FORMATS.row,
data: (0, _dataProcessor.processRowObject)(content)
};
} else if (isGeoJson(content)) {
return {
format: _defaultSettings.DATASET_FORMATS.geojson,
data: (0, _dataProcessor.processGeojson)(content)
};
} // unsupported json format
_console["default"].warn("unsupported Json format ".concat(file.name));
return null;
});
}
function readJSONFile(fileBlob) {
return new Promise(function (resolve, reject) {
var fileReader = new _window.FileReader();
fileReader.onload = function (_ref5) {
var result = _ref5.target.result;
try {
var json = JSON.parse(result);
resolve(json);
} catch (err) {
reject(null);
}
};
fileReader.readAsText(fileBlob, 'UTF-8');
});
}
function isGeoJson(json) {
// json can be feature collection
// or simgle feature
return (0, _utils.isPlainObject)(json) && (isFeature(json) || isFeatureCollection(json));
}
function isFeature(json) {
return json.type === 'Feature' && json.geometry;
}
function isFeatureCollection(json) {
return json.type === 'FeatureCollection' && json.features;
}
function isRowObject(json) {
return Array.isArray(json) && (0, _utils.isPlainObject)(json[0]);
}
function isKeplerGlMap(json) {
return (0, _utils.isPlainObject)(json) && json.datasets && json.config && json.info && json.info.app === 'kepler.gl';
}
function determineJsonProcess(_ref6, defaultProcessor) {
var dataset = _ref6.dataset,
format = _ref6.format;
if (isKeplerGlMap(dataset)) {
return _dataProcessor.processKeplerglJSON;
}
return defaultProcessor;
}
function filesToDataPayload(fileCache) {
// seperate out files which could be a single datasets. or a keplergl map json
var collection = fileCache.reduce(function (accu, file) {
var data = file.data,
_file$info = file.info,
info = _file$info === void 0 ? {} : _file$info;
var format = info.format;
if (format === _defaultSettings.DATASET_FORMATS.keplergl) {
// if file contains a single kepler map dataset & config
accu.keplerMaps.push(_objectSpread({}, data, {
options: {
centerMap: !(data.config && data.config.mapState)
}
}));
} else if (_defaultSettings.DATASET_FORMATS[format]) {
// if file contains only data
var newDataset = {
data: data,
info: _objectSpread({
id: info.id || (0, _utils.generateHashId)(4)
}, info)
};
accu.datasets.push(newDataset);
}
return accu;
}, {
datasets: [],
keplerMaps: []
}); // add kepler map first with config
// add datasets later in one add data call
return collection.keplerMaps.concat({
datasets: collection.datasets
});
}
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Copyright (c) 2020 Uber Technologies, Inc.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a copy\n// of this software and associated documentation files (the \"Software\"), to deal\n// in the Software without restriction, including without limitation the rights\n// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\n// copies of the Software, and to permit persons to whom the Software is\n// furnished to do so, subject to the following conditions:\n//\n// The above copyright notice and this permission notice shall be included in\n// all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\n// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\n// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\n// THE SOFTWARE.\n\nimport {FileReader} from 'global/window';\nimport Console from 'global/console';\nimport {\n  processCsvData,\n  processGeojson,\n  processKeplerglJSON,\n  processRowObject\n} from './data-processor';\nimport {isPlainObject, generateHashId} from 'utils/utils';\nimport {DATASET_FORMATS} from 'constants/default-settings';\n\nconst FILE_HANDLERS = {\n  csv: loadCsv,\n  json: loadJSON\n};\n\nexport function readFile({file, fileCache = []}) {\n  return new Promise((resolve, reject) => {\n    const {handler, format} = getFileHandler(file);\n    if (!handler) {\n      Console.warn(\n        `Canont determine file handler for file ${file.name}. It must have a valid file extension`\n      );\n      resolve(fileCache);\n    }\n\n    handler({file, format}).then(result => {\n      if (!result || !result.data) {\n        // return fileCache, to keep process other files\n        resolve(fileCache);\n      }\n      resolve([\n        ...fileCache,\n        {\n          data: result.data,\n          info: {\n            label: file.name,\n            format: result.format\n          }\n        }\n      ]);\n    });\n  });\n}\n\nexport function getFileHandler(fileBlob) {\n  const type = getFileType(fileBlob.name);\n\n  return {handler: FILE_HANDLERS[type], format: type};\n}\n\nexport function getFileType(filename) {\n  if (filename.endsWith('csv')) {\n    return 'csv';\n  } else if (filename.endsWith('json') || filename.endsWith('geojson')) {\n    // Read GeoJson from browser\n    return 'json';\n  }\n\n  // Wait to add other file type handler\n  return 'other';\n}\n\nfunction readCSVFile(fileBlob) {\n  return new Promise((resolve, reject) => {\n    const fileReader = new FileReader();\n    fileReader.onload = ({target: {result}}) => {\n      resolve(result);\n    };\n\n    fileReader.readAsText(fileBlob);\n  });\n}\n\nexport function loadCsv({file, format, processor = processCsvData}) {\n  return readCSVFile(file).then(rawData => (rawData ? {data: processor(rawData), format} : null));\n}\n\nexport function loadJSON({file, processor = processGeojson}) {\n  return readJSONFile(file).then(content => {\n    if (isKeplerGlMap(content)) {\n      return {\n        format: DATASET_FORMATS.keplergl,\n        data: processKeplerglJSON(content)\n      };\n    } else if (isRowObject(content)) {\n      return {\n        format: DATASET_FORMATS.row,\n        data: processRowObject(content)\n      };\n    } else if (isGeoJson(content)) {\n      return {\n        format: DATASET_FORMATS.geojson,\n        data: processGeojson(content)\n      };\n    }\n    // unsupported json format\n    Console.warn(`unsupported Json format ${file.name}`);\n    return null;\n  });\n}\n\nexport function readJSONFile(fileBlob) {\n  return new Promise((resolve, reject) => {\n    const fileReader = new FileReader();\n    fileReader.onload = ({target: {result}}) => {\n      try {\n        const json = JSON.parse(result);\n        resolve(json);\n      } catch (err) {\n        reject(null);\n      }\n    };\n\n    fileReader.readAsText(fileBlob, 'UTF-8');\n  });\n}\n\nexport function isGeoJson(json) {\n  // json can be feature collection\n  // or simgle feature\n  return isPlainObject(json) && (isFeature(json) || isFeatureCollection(json));\n}\n\nexport function isFeature(json) {\n  return json.type === 'Feature' && json.geometry;\n}\n\nexport function isFeatureCollection(json) {\n  return json.type === 'FeatureCollection' && json.features;\n}\n\nexport function isRowObject(json) {\n  return Array.isArray(json) && isPlainObject(json[0]);\n}\n\nexport function isKeplerGlMap(json) {\n  return (\n    isPlainObject(json) &&\n    json.datasets &&\n    json.config &&\n    json.info &&\n    json.info.app === 'kepler.gl'\n  );\n}\n\nexport function determineJsonProcess({dataset, format}, defaultProcessor) {\n  if (isKeplerGlMap(dataset)) {\n    return processKeplerglJSON;\n  }\n\n  return defaultProcessor;\n}\n\nexport function filesToDataPayload(fileCache) {\n  // seperate out files which could be a single datasets. or a keplergl map json\n  const collection = fileCache.reduce(\n    (accu, file) => {\n      const {data, info = {}} = file;\n      const {format} = info;\n      if (format === DATASET_FORMATS.keplergl) {\n        // if file contains a single kepler map dataset & config\n        accu.keplerMaps.push({\n          ...data,\n          options: {\n            centerMap: !(data.config && data.config.mapState)\n          }\n        });\n      } else if (DATASET_FORMATS[format]) {\n        // if file contains only data\n        const newDataset = {\n          data,\n          info: {\n            id: info.id || generateHashId(4),\n            ...info\n          }\n        };\n        accu.datasets.push(newDataset);\n      }\n      return accu;\n    },\n    {datasets: [], keplerMaps: []}\n  );\n\n  // add kepler map first with config\n  // add datasets later in one add data call\n  return collection.keplerMaps.concat({datasets: collection.datasets});\n}\n"]}