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Copy pathdatadata.js
File metadata and controls
647 lines (581 loc) · 18.6 KB
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(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
},{}],2:[function(require,module,exports){
/*! datadata.js © 2014-2015 Florian Ledermann
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
'use strict';
// test whether in a browser environment
if (typeof window === 'undefined') {
// node
var d3dsv = require('d3-dsv');
var fs = require('fs');
var fileparser = function(func) {
return function(path, row, callback) {
if (dd.isUndefined(callback)) {
callback = row;
row = null;
}
fs.readFile(path, 'utf8', function(error, data) {
if (error) return callback(error);
data = func(data, row);
callback(null,data);
});
};
};
var d3 = {
csv: fileparser(d3dsv.csv.parse),
tsv: fileparser(d3dsv.tsv.parse),
json: fileparser(JSON.parse)
};
} else {
// browser
// we expect global d3 to be available
var d3 = window.d3;
}
function rowFileHandler(loader) {
// TODO: file handler API should not need to be passed map, reduce functions but be wrapped externally
return function(path, map, reduce, options) {
options = dd.merge({
// default accessor function tries to convert number-like strings to numbers
accessor: function(d) {
var keys = Object.keys(d);
for (var i=0; i<keys.length; i++) {
var key = keys[i],
val = d[key];
// CSV doesn't support specification of null values
// interpret empty field values as missing
if (val === "") {
d[key] = null;
}
else if (dd.isNumeric(val)) {
// unary + converts both ints and floats correctly
d[key] = +val;
}
}
return d;
}
}, options);
return new Promise(function(resolve, reject) {
loader(path, options.accessor,
function(error, data) {
if (error) {
reject(error);
return;
}
resolve(dd.mapreduce(data, map, reduce));
}
);
});
};
}
function jsonFileHandler(path, map, reduce) {
return new Promise(function(resolve, reject) {
d3.json(path, function(error, data) {
if (error) {
reject(error);
return;
}
if (dd.isArray(data)) {
resolve(dd.mapreduce(data, map, reduce));
}
else {
// object - treat entries as keys by default
var keys = Object.keys(data);
var map_func;
if (!map) {
// use keys as data to emit key/data pairs in map step!
map_func = dd.map.dict(data);
}
else {
map_func = function(k, emit) {
// put original key into object
var v = data[k];
v.__key__ = k;
// call user-provided map funtion with object
map(v, emit);
};
}
resolve(dd.mapreduce(keys, map_func, reduce));
}
});
});
}
var fileHandlers = {
'csv': rowFileHandler(d3.csv),
'tsv': rowFileHandler(d3.tsv),
'json': jsonFileHandler
};
var getFileHandler = function(pathOrExt) {
// guess type
var ext = pathOrExt.split('.').pop().toLowerCase();
return fileHandlers[ext] || null;
};
var registerFileHandler = function(ext, handler) {
fileHandlers[ext] = handler;
};
// TODO: register .topojson, .geojson in mapmap.js
/**
Datadata - a module for loading and processing data.
You can call the module as a function to create a promise for data from a URL, Function or Array.
Returns a promise for data for everything.
@param {(string|function|Array)} spec - A String (URL), Function or Array of data.
@param {(function|string)} [map={@link datadata.map.dict}] - The map function for map/reduce.
@param {(string)} [reduce=datadata.emit.last] - The reduce function for map/reduce.
@exports module:datadata
*/
var dd = function(spec, map, reduce, options) {
// options
// type: override file extension, e.g. for API urls (e.g. 'csv')
// fileHandler: manually specify file handler to be used to load & parse file
options = options || {};
if (spec == null) throw new Error("datadata.js: No data specification.");
if (map && !dd.isFunction(map)) {
// map is string -> map to attribute value
map = dd.map.key(map);
}
if (dd.isString(spec)) {
// consider spec to be a URL/file to load
var handler = options.fileHandler || getFileHandler(options.type || spec);
if (handler) {
return handler(spec, map, reduce, options);
}
else {
throw new Error("datadata.js: Unknown file type for: " + spec);
}
}
if (dd.isArray(spec)) {
return new Promise(function(resolve, reject) {
resolve(dd.mapreduce(spec, map, reduce));
});
}
throw new Error("datadata.js: Unknown data specification.");
};
// expose registration method & rowFileHandler helper
dd.registerFileHandler = registerFileHandler;
dd.rowFileHandler = rowFileHandler;
// simple load function, returns a promise for data without map/reduce-ing
// DO NOT USE - present only for mapmap.js legacy reasons
dd.load = function(spec, key) {
if (spec.then && typeof spec.then === 'function') {
// already a thenable / promise
return spec;
}
else if (dd.isString(spec)) {
// consider spec to be a URL to load
// guess type
var ext = spec.split('.').pop();
if (ext == 'json' || ext == 'topojson' || ext == 'geojson') {
return new Promise(function(resolve, reject) {
d3.json(spec, function(error, data) {
if (error) {
reject(error);
return;
}
resolve(data);
});
});
}
else {
console.warn("Unknown extension: " + ext);
}
}
};
// Type checking
/**
Return true if argument is a string.
@param {any} val - The value to check.
*/
dd.isString = function (val) {
return Object.prototype.toString.call(val) == '[object String]';
};
/**
Return true if argument is a function.
@param {any} val - The value to check.
*/
dd.isFunction = function(obj) {
return (typeof obj === 'function');
};
/**
Return true if argument is an Array.
@param {any} val - The value to check.
*/
dd.isArray = function(obj) {
return (obj instanceof Array);
};
/**
Return true if argument is an Object, but not an Array, String or anything created with a custom constructor.
@param {any} val - The value to check.
*/
dd.isDictionary = function(obj) {
return (obj && obj.constructor && obj.constructor === Object);
};
/**
Return true if argument is undefined.
@param {any} val - The value to check.
*/
dd.isUndefined = function(obj) {
return (typeof obj == 'undefined');
};
/**
Return true if argument is a number or a string that strictly looks like a number.
This method is stricter than +val or parseInt(val) as it doesn't validate the empty
string or strings contining any non-numeric characters.
@param {any} val - The value to check.
*/
dd.isNumeric = function(val) {
// check if string looks like a number
// +"" => 0
// parseInt("") => NaN
// parseInt("123OK") => 123
// +"123OK" => NaN
// so we need to pass both to be strict
return !isNaN(+val) && !isNaN(parseFloat(val));
}
// Type conversion / utilities
/**
If the argument is already an Array, return a copy of the Array.
Else, return a single-element Array containing the argument.
*/
dd.toArray = function(val) {
if (!val) return [];
// return a copy if aready array, else single-element array
return dd.isArray(val) ? val.slice() : [val];
};
/**
Shallow object merging, mainly for options. Returns a new object.
*/
dd.merge = function() {
var obj = {};
for (var i = 0; i < arguments.length; i++) {
var src = arguments[i];
for (var key in src) {
if (src.hasOwnProperty(key)) {
obj[key] = src[key];
}
}
}
return obj;
};
/**
Return an {@link module:datadata.OrderedHash|OrderedHash} object.
@exports module:datadata.OrderedHash
*/
dd.OrderedHash = function() {
// ordered hash implementation
var keys = [];
var vals = {};
return {
/**
Add a key/value pair to the end of the OrderedHash.
@param {String} k - Key
@param v - Value
*/
push: function(k,v) {
if (!vals[k]) keys.push(k);
vals[k] = v;
},
/**
Insert a key/value pair at the specified position.
@param {Number} i - Index to insert value at
@param {String} k - Key
@param v - Value
*/
insert: function(i,k,v) {
if (!vals[k]) {
keys.splice(i,0,k);
vals[k] = v;
}
},
/**
Return the value for specified key.
@param {String} k - Key
*/
get: function(k) {
// string -> key
return vals[k];
},
/**
Return the value at specified index position.
@param {String} i - Index
*/
at: function(i) {
// number -> nth object
return vals[keys[i]];
},
length: function(){return keys.length;},
keys: function(){return keys;},
key: function(i) {return keys[i];},
values: function() {
return keys.map(function(key){return vals[key];});
},
map: function(func) {
return keys.map(function(k){return func(k, vals[k]);});
},
unsorted_dict: function() {
return vals;
}
};
};
// Utility functions for map/reduce
dd.map = {
key: function(attr, remap) {
return function(d, emit) {
var key = d[attr];
if (remap && remap[key] !== undefined) {
key = remap[key];
}
emit(key, d);
};
},
dict: function(dict) {
return function(d, emit) {
emit(d, dict[d]);
};
}
};
dd.emit = {
ident: function() {
return function(key, values, emit) {
emit(key, values);
};
},
first: function() {
return function(key, values, emit) {
emit(key, values[0]);
};
},
last: function() {
return function(key, values, emit) {
emit(key, values[values.length - 1]);
};
},
merge: function() {
return function(key, values, emit) {
var obj = values.reduce(function(prev, curr) {
var keys = Object.keys(curr);
for (var i=0; i<keys.length; i++) {
var k = keys[i];
prev[k] = curr[k];
}
return prev;
});
emit(key, obj);
};
},
toAttr: function(attr, func) {
func = func || dd.emit.last();
return function(key, values, emit) {
func(key, values, function(k, v) {
var obj = {};
obj[attr] = v;
emit(k, obj);
});
};
},
sum: function(include, exclude) {
include = wildcards(include || '*');
exclude = wildcards(exclude);
return function(key, values, emit) {
var obj = values.reduce(function(prev, curr) {
var keys = Object.keys(curr);
for (var i=0; i<keys.length; i++) {
var key = keys[i],
doAdd = false,
j;
for (j=0; j<include.length; j++) {
if (key.search(include[i]) > -1) {
doAdd = true;
break;
}
}
for (j=0; j<exclude.length; j++) {
if (key.search(include[j]) > -1) {
doAdd = false;
break;
}
}
if (doAdd && prev[key] && curr[key] && !isNaN(prev[key]) && !isNaN(curr[key])) {
prev[key] = prev[key] + curr[key];
}
else {
prev[key] = curr[key];
if (doAdd) {
console.warn("datadata.emit.sum(): Cannot add keys " + key + "!");
}
}
}
return prev;
});
emit(key, obj);
};
}
};
dd.map.geo = {
point: function(latProp, lonProp, keyProp) {
var id = 0;
return function(d, emit) {
var key = keyProp ? d[keyProp] : id++;
emit(key, dd.geo.Point(d[lonProp], d[latProp], d));
};
}
};
dd.emit.geo = {
segments: function() {
return function(key, data, emit) {
var prev = null, cur = null;
for (var i=0; i<data.length; i++) {
cur = data[i];
if (prev) {
emit(key + '-' + i, dd.geo.LineString([[prev.lon,prev.lat],[cur.lon,cur.lat]], prev));
}
prev = cur;
}
};
}
};
// constructors for GeoJSON objects
dd.geo = {
Point: function(lon, lat, properties) {
return {
type: 'Feature',
geometry: {
type: 'Point',
coordinates: [lon, lat]
},
properties: properties
};
},
LineString: function(coordinates, properties) {
return {
type: 'Feature',
geometry: {
type: 'LineString',
coordinates: coordinates
},
properties: properties
};
}
};
function wildcards(spec) {
spec = dd.toArray(spec);
for (var i=0; i<spec.length; i++) {
if (!(spec[i] instanceof RegExp)) {
spec[i] = new RegExp('^' + spec[i].replace('*','.*').replace('?','.'));
}
}
return spec;
}
// https://code.google.com/p/mapreduce-js/
// Mozilla Public License
dd.mapreduce = function (data, map, reduce) {
var mapResult = [],
reduceResult = dd.OrderedHash(),
reduceKey;
reduce = reduce || dd.emit.last(); // default
var mapEmit = function(key, value) {
if (key == null) return; // do not emit if key is null or undefined
if(!mapResult[key]) {
mapResult[key] = [];
}
mapResult[key].push(value);
};
var reduceEmit = function(key, value) {
reduceResult.push(key, value);
};
for(var i = 0; i < data.length; i++) {
map(data[i], mapEmit);
}
for(reduceKey in mapResult) {
reduce(reduceKey, mapResult[reduceKey], reduceEmit);
}
return reduceResult;
};
dd.mapreducer = function(map, reduce) {
return function(data) {
dd.mapreduce(data, map, reduce);
};
};
// Helper functions for map etc.
// put 'd' in another object using the attribute 'key'
// optional 'pull' is the name of a key to leave on the top level
dd.envelope = function(key, pull, func) {
return function(d) {
if (pull && typeof pull == 'function') {
// envelope(key, func) case
func = pull;
pull = null;
}
if (func) d = func(d);
var val = {};
val[key] = d;
if (pull) {
val[pull] = d[pull];
delete d[pull];
}
return val;
};
};
dd.prefix = function(prefix, func) {
return function(d) {
if (func) d = func(d);
var val = {},
keys = Object.keys(d);
for (var i=0; i<keys.length; i++) {
val[prefix + keys[i]] = d[keys[i]];
}
return val;
};
};
dd.prefix_attr = function(attr, func) {
return function(d) {
if (func) d = func(d);
var val = {},
keys = Object.keys(d),
prefix = d[attr] ? d[attr] + '_' : '';
for (var i=0; i<keys.length; i++) {
val[prefix + keys[i]] = d[keys[i]];
}
return val;
};
};
dd.map_attr = function(map, func) {
return function(d) {
if (func) d = func(d);
if (typeof map == 'function') {
d = map(d);
}
else {
var keys = Object.keys(map);
for (var i=0; i<keys.length; i++) {
var key = keys[i];
var val = map[key];
if (typeof val == 'function') {
d[key] = val(d);
}
else if (d[val]) {
d[key] = d[val];
delete d[val];
}
}
}
return d;
};
};
dd.reverse = function(data) {
if (data.slice && typeof data.slice == 'function') {
// slice() = copy
return data.slice().reverse();
}
return data;
};
module.exports = dd;
},{"d3-dsv":1,"fs":1}]},{},[2]);
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