treem
Version:
High performance conversion of flat data (like SQL result rows) into nested objects.
203 lines (182 loc) • 17.6 kB
JavaScript
'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
var _classCallCheck2 = require('babel-runtime/helpers/classCallCheck');
var _classCallCheck3 = _interopRequireDefault(_classCallCheck2);
var _createClass2 = require('babel-runtime/helpers/createClass');
var _createClass3 = _interopRequireDefault(_createClass2);
var _equalArray = require('equal-array');
var _equalArray2 = _interopRequireDefault(_equalArray);
var _header = require('./header');
var _header2 = _interopRequireDefault(_header);
var _node = require('./node');
var _node2 = _interopRequireDefault(_node);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
var DEFAULT_KEY_SYMBOL = '#';
var DEFAULT_COLLECTION_SYMBOL = '+';
var DEFAULT_SEPARATOR_SYMBOL = '.';
var Treem = function () {
function Treem() {
var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
(0, _classCallCheck3.default)(this, Treem);
var symbols = {
key: DEFAULT_KEY_SYMBOL,
collection: DEFAULT_COLLECTION_SYMBOL,
separator: DEFAULT_SEPARATOR_SYMBOL
};
if (options.symbols !== undefined) {
if (options.symbols.key !== undefined) {
symbols.key = options.symbols.key;
}
if (options.symbols.collection !== undefined) {
symbols.collection = options.symbols.collection;
}
if (options.symbols.separator !== undefined) {
symbols.separator = options.symbols.separator;
}
}
this._separator = symbols.separator;
// default options
this._config = {
headers: undefined,
reuseObject: 'key',
overwriteObject: false,
root: 'collection',
wrap: {
single: function single() {
return {};
},
collection: function collection() {
return [];
}
},
detect: {
key: function key(node) {
return {
check: node.startsWith(symbols.key),
name: node.substring(symbols.key.length)
};
},
collection: function collection(node) {
return {
check: node.startsWith(symbols.collection),
name: node.substring(symbols.collection.length)
};
}
},
prune: function prune(x) {
return x === undefined || x === null;
},
equalArray: new _equalArray2.default()
};
this._config.headers = options.headers;
if (options.reuseObject !== undefined) {
this._config.reuseObject = options.reuseObject;
}
if (options.overwriteObject !== undefined) {
this._config.overwriteObject = options.overwriteObject;
}
if (options.root !== undefined) {
this._config.root = options.root;
}
if (options.wrap !== undefined) {
if (options.wrap.single !== undefined) {
this._config.wrap.single = options.wrap.single;
}
if (options.wrap.collection !== undefined) {
this._config.wrap.collection = options.wrap.collection;
}
}
if (options.detect !== undefined) {
if (options.detect.key !== undefined) {
this._config.detect.key = options.detect.key;
}
if (options.detect.collection !== undefined) {
this._config.detect.collection = options.detect.collection;
}
}
if (options.prune !== undefined) {
if (options.prune !== true) {
if (options.prune === false) {
this._config.prune = function () {
return false;
};
} else {
this._config.prune = options.prune;
}
}
}
this.reset();
}
(0, _createClass3.default)(Treem, [{
key: 'reset',
value: function reset() {
this._firstFeed = true;
if (this._config.root === 'collection') {
this._data = this._config.wrap.collection('');
} else {
this._data = this._config.wrap.single('');
}
this._root = undefined;
}
}, {
key: 'fill',
value: function fill(rows) {
this.reset();
this.feed(rows);
}
}, {
key: 'feed',
value: function feed(rows) {
var _this = this;
if (rows.length === 0) return;
if (this._root === undefined) {
var headers = this._config.headers;
if (headers === undefined) {
headers = {};
for (var property in rows[0]) {
headers[property] = property;
}
}
this._root = this._makeRoot(headers);
}
if (this._config.root === 'collection') {
rows.forEach(function (row) {
return _this._root.add(row, _this);
});
} else {
var start = 0;
if (this._firstFeed) {
this._root.add(rows[0], this);
start = 1;
}
var memData = this._data;
for (var i = start; i < rows.length; i++) {
this._root.add(rows[i], this);
if (!this._config.overwriteObject) {
this._data = memData;
}
}
}
this._firstFeed = false;
}
}, {
key: '_makeRoot',
value: function _makeRoot(headers) {
var columns = [];
for (var header in headers) {
columns.push(new _header2.default(header, headers[header], this._separator, this._config.detect));
}
return new _node2.default('_data', columns, this._config, this._config.root === 'collection');
}
}, {
key: 'data',
get: function get() {
return this._data;
}
}]);
return Treem;
}();
exports.default = Treem;
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EqualArray from 'equal-array';\nimport Header from './header';\nimport Node from './node';\n\nconst DEFAULT_KEY_SYMBOL = '#';\nconst DEFAULT_COLLECTION_SYMBOL = '+';\nconst DEFAULT_SEPARATOR_SYMBOL = '.';\n\nexport default class Treem {\n\n  constructor(options = {}) {\n    const symbols = {\n      key: DEFAULT_KEY_SYMBOL,\n      collection: DEFAULT_COLLECTION_SYMBOL,\n      separator: DEFAULT_SEPARATOR_SYMBOL\n    }\n    if (options.symbols !== undefined) {\n      if (options.symbols.key !== undefined) {\n        symbols.key = options.symbols.key;\n      }\n      if (options.symbols.collection !== undefined) {\n        symbols.collection = options.symbols.collection;\n      }\n      if (options.symbols.separator !== undefined) {\n        symbols.separator = options.symbols.separator;\n      }\n    }\n    this._separator = symbols.separator;\n    // default options\n    this._config = {\n      headers: undefined,\n      reuseObject: 'key',\n      overwriteObject: false,\n      root: 'collection',\n      wrap: {\n        single: () => {return {}},\n        collection: () => []\n      },\n      detect: {\n        key: node => {\n          return {\n            check: node.startsWith(symbols.key),\n            name: node.substring(symbols.key.length)\n          }\n        },\n        collection: node => {\n          return {\n            check: node.startsWith(symbols.collection),\n            name: node.substring(symbols.collection.length)\n          }\n        }\n      },\n      prune: x => x === undefined || x === null,\n      equalArray: new EqualArray()\n    }\n    this._config.headers = options.headers;\n    if (options.reuseObject !== undefined)  {\n      this._config.reuseObject = options.reuseObject;\n    }\n    if (options.overwriteObject !== undefined)  {\n      this._config.overwriteObject = options.overwriteObject;\n    }\n    if (options.root !== undefined)  {\n      this._config.root = options.root;\n    }\n    if (options.wrap !== undefined) {\n      if (options.wrap.single !== undefined) {\n        this._config.wrap.single = options.wrap.single;\n      }\n      if (options.wrap.collection !== undefined) {\n        this._config.wrap.collection = options.wrap.collection;\n      }\n    }\n    if (options.detect !== undefined) {\n      if (options.detect.key !== undefined) {\n        this._config.detect.key = options.detect.key;\n      }\n      if (options.detect.collection !== undefined) {\n        this._config.detect.collection = options.detect.collection;\n      }\n    }\n    if (options.prune !== undefined)  {\n      if (options.prune !== true) {\n        if (options.prune === false) {\n          this._config.prune = () => false;\n        } else {\n          this._config.prune = options.prune;\n        }\n      }\n    }\n    this.reset();\n  }\n\n  get data() {\n    return this._data;\n  }\n\n  reset() {\n    this._firstFeed = true;\n    if (this._config.root === 'collection') {\n      this._data = this._config.wrap.collection('');\n    } else {\n      this._data = this._config.wrap.single('');\n    }\n    this._root = undefined;\n  }\n\n  fill(rows) {\n    this.reset();\n    this.feed(rows);\n  }\n\n  feed(rows) {\n    if (rows.length === 0) return;\n\n    if (this._root === undefined) {\n      let headers = this._config.headers;\n      if (headers === undefined) {\n        headers = {};\n        for (let property in rows[0]) {\n          headers[property] = property;\n        }\n      }\n      this._root = this._makeRoot(headers);\n    }\n\n    if (this._config.root === 'collection') {\n      rows.forEach(row => this._root.add(row, this));\n    } else {\n      let start = 0;\n      if (this._firstFeed) {\n        this._root.add(rows[0], this);\n        start = 1;\n      }\n      const memData = this._data;\n      for (let i = start; i < rows.length; i++) {\n        this._root.add(rows[i], this);\n        if (!this._config.overwriteObject) {\n          this._data = memData;\n        }\n      }\n    }\n\n    this._firstFeed = false;\n  }\n\n  _makeRoot(headers) {\n    const columns = [];\n    for (let header in headers) {\n      columns.push(new Header(header, headers[header], this._separator, this._config.detect));\n    }\n    return new Node('_data', columns, this._config, this._config.root === 'collection');\n  }\n\n}\n"]}