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Import from original, clean up HTML, extract CSS, add json2.js and jq…

…uery-1.3.2.min.js, rename to jscouch
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commit fa39d8727bebf2fe9fd898d3823a9aeb0ff1ddaf 0 parents
Jan Lehnardt authored
Showing with 1,542 additions and 0 deletions.
  1. +19 −0 jquery-1.3.2.min.js
  2. +110 −0 jscouch.css
  3. +189 −0 jscouch.html
  4. +746 −0 jscouch.js
  5. +478 −0 json2.js
19 jquery-1.3.2.min.js
@@ -0,0 +1,19 @@
+/*
+ * jQuery JavaScript Library v1.3.2
+ * http://jquery.com/
+ *
+ * Copyright (c) 2009 John Resig
+ * Dual licensed under the MIT and GPL licenses.
+ * http://docs.jquery.com/License
+ *
+ * Date: 2009-02-19 17:34:21 -0500 (Thu, 19 Feb 2009)
+ * Revision: 6246
+ */
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110 jscouch.css
@@ -0,0 +1,110 @@
+/*
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * Mu Dynamics Research Labs wrote this file. As long as you retain this
+ * notice you can do whatever you want with this stuff. If we meet some day,
+ * and you think this stuff is worth it, you can buy us a beer in return.
+ *
+ * http://www.mudynamics.com
+ * http://labs.mudynamics.com
+ * http://www.pcapr.net
+ */
+body {
+ background-color: rgb(244, 244, 244);
+ color: rgb(51, 51, 51);
+ line-height: 135%;
+ font-size: 13px;
+ font-family: Arial, Helvetica, sans-serif;
+}
+
+select, textarea, input {
+ font-size: 13px;
+ font-family: Arial, Helvetica, sans-serif;
+}
+
+.icouch fieldset#tabs legend a {
+ background-color: transparent;
+ margin: 2px;
+ padding: 2px;
+ border: none;
+ text-decoration: none;
+ outline: none;
+}
+
+.icouch fieldset#tabs legend a.active {
+ background-color: #dddddd;
+ border: 1px solid #9aafe5;
+}
+
+.icouch select {
+ vertical-align: middle;
+}
+
+.icouch a {
+ cursor: pointer;
+ color: rgb(39, 39, 192);
+}
+
+.icouch a:hover {
+ color: black;
+}
+
+.icouch div#doc {
+ margin-left: 20px;
+}
+
+.icouch table#docs thead td {
+ font-weight: bold;
+}
+
+.icouch table#docs td {
+ border-bottom: 1px inset #9aafe5;
+}
+
+.icouch table#docs tbody tr:hover {
+ background-color: #dddddd;
+}
+
+.icouch div#map textarea {
+ background-color: #fff8dc;
+ margin-left: 20px;
+ width: 80%;
+}
+
+.icouch div#map table#results thead td {
+ font-weight: bold;
+}
+
+.icouch div#map table#results tbody td.reduced {
+ vertical-align: middle;
+ border-left: 2px dotted #9aafe5;
+}
+
+.icouch div#map table#results tbody tr:hover {
+ background-color: #dddddd;
+}
+
+.icouch div#blurb {
+ margin-left: 20px;
+ padding-left: 20px;
+ border-left: 2px dotted #9aafe5;
+ color: #000088;
+}
+
+img.icon {
+ vertical-align: middle;
+ border: none;
+ width: 16px;
+}
+
+.jstring { color: #008800; }
+.jnumber { color: #880000; }
+.jkeyword { color: #000088; }
+
+.credits {
+ margin: -10px 0 2ex 20px;
+ font-size: 10pt;
+}
+
+.intro {
+ margin-bottom:2ex;
+}
189 jscouch.html
@@ -0,0 +1,189 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+ <head>
+ <!--
+ /*
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * Mu Dynamics Research Labs wrote this file. As long as you retain this
+ * notice you can do whatever you want with this stuff. If we meet some day,
+ * and you think this stuff is worth it, you can buy us a beer in return.
+ *
+ * http://www.mudynamics.com
+ * http://labs.mudynamics.com
+ * http://www.pcapr.net
+ */
+ -->
+ <title>Interactive CouchDB | Mu Dynamics</title>
+ <meta name="robots" content="index, follow">
+ <meta name="description" content="A JavaScript-based CouchDB emulator that implements key CouchDB concepts like collation, map/reduce and incremental reduce. This also serves as a 2 minute CouchDB tutorial.">
+ <meta http-equiv="content-type" content="text/xhtml; charset=utf-8" />
+
+ <link rel="stylesheet" href="jscouch.css" type="text/css" media="screen" charset="utf-8">
+ <script type="text/javascript" src="jquery-1.3.2.min.js"></script>
+ <script type="text/javascript" src="json2.js"></script>
+ <script type="text/javascript" src="jscouch.js"></script>
+ </head>
+ <body>
+
+ <h2>Interactive CouchDB</h2>
+
+ <div class="credits">
+ created by
+ <img class="icon" src="http://www.pcapr.net/static/image/favicon.png">
+ <a href="http://www.mudynamics.com">Mu Dynamics</a>
+ for this <a href="http://labs.mudynamics.com/2009/04/03/interactive-couchdb/">blog</a>.
+ </div>
+
+ <div class="intro">
+ This is a CouchDB emulator/visualizer written in 100% JavaScript, which
+ implements key concepts like collation, map/reduce and incremental reduce. It
+ also acts as a 2-minute CouchDB tutorial. No documents were harmed in this
+ process.
+ </div>
+
+ <div class="icouch">
+ <fieldset id="tabs">
+ <legend>
+ <a id="documents" href="javascript:void(0)" class="active">documents</a>
+ <a id="map" href="javascript:void(0)" class="">map/reduce</a>
+ </legend>
+
+ <div id="pane">
+ <div id="documents" style="">
+ <div>
+ <p>
+ <a href="http://couchdb.apache.org/">CouchDB</a> stores
+ schema-less JSON documents in a flat namespace.
+ Each document has an <em>id</em> that's either auto generated
+ or provided by the user. The JSON documents can be as simple
+ or as complex as it can be. You can think of each document as
+ an instance of a particular <strong>class</strong>. CouchDB
+ doesn't know or track relationships between documents. It's up
+ to you to keep track of that.</p> <p>The sample DB below
+ contains information about a bunch of pictures uploaded and
+ tagged by different users with some meta data about each
+ picture.
+ </p>
+ </div>
+
+ <table id="docs" width="100%">
+ <colgroup>
+ <col span="1">
+ <col width="100%">
+ </colgroup>
+ <thead>
+ <tr>
+ <td>id</td>
+ <td>doc</td>
+ </tr>
+ </thead>
+ <tbody>
+ </tbody>
+ </table>
+ » &nbsp;<a id="add" href="javascript:void(0)">add</a>
+ <div id="doc" style="display: none">
+ <textarea id="doc" rows="4" cols="60"></textarea>
+ <div>
+ <input type="button" value="apply">
+ <span class="warn" style="color: red"></span>
+ </div>
+ </div>
+ </div>
+
+ <div id="map" style="display: none; ">
+ <div>
+ <p>
+ Now that we have the documents in place, we can use the
+ <strong>map</strong> function to generate complex key
+ value pairs (sorted by key) and then
+ <strong>reduce</strong> the values corresponding to each
+ unique key into either a simple or complex value.
+ </p>
+ <p>
+ This is a very key concept so it's worth reiterating. The
+ key/value pairs generated by the <strong>map</strong>
+ function are stored in a BTree and are updated incrementally
+ as documents are added or updated. The query against a
+ view is simply slicing this sorted key space, potentially
+ <strong>reducing</strong> the slice and returning the
+ values. CouchDB will cache the reduced values in the BTree
+ as well and will try and reuse these cached values during
+ the key-space slicing, a.k.a. query.
+ </p>
+ <p>
+ Try and learn:
+ <select id="examples">
+ <option>choose one</option>
+ </select>
+ </p>
+ <div id="blurb"></div>
+ </div>
+
+ <table style="margin-top: 10px" width="100%">
+ <tbody>
+ <tr>
+ <td width="50%">
+ <div>
+ <div>function(<strong>doc</strong>) {</div>
+ <div>
+ <textarea id="map" rows="6">emit(null, null);</textarea>
+ </div>
+ <div>}</div>
+ </div>
+ </td>
+ <td width="50%">
+ <div>
+ <div>function(keys, values, <strong>rereduce</strong>) {</div>
+ <div>
+ <textarea id="reduce" rows="6"></textarea>
+ </div>
+ <div>}</div>
+ </div>
+ </td>
+ </tr>
+ </tbody>
+ </table>
+
+ <div>
+ »
+ <a id="execute" href="javascript:void(0)">execute</a>
+ <span class="warn" style="color: red"></span>
+ </div>
+
+
+ <table id="bottom" width="100%" style="display:none">
+ <tbody>
+ <tr>
+ <td valign="top" width="50%">
+ <table id="results"></table>
+ </td>
+ <td valign="top" width="50%">
+ <div>
+ query:&nbsp;
+ <select id="view">
+ <option>all</option>
+ <option>key</option>
+ <option>range</option>
+ </select>
+ <span id="views">
+ <span id="all">
+ </span>
+ <span id="key" style="display:none">
+ <input id="key" type="text" size="12">
+ </span>
+ <span id="range" style="display:none">
+ between <input id="startkey" type="text" size="12">
+ and <input id="endkey" type="text" size="12">
+ </span>
+ </span></div>
+ <div id="response"></div>
+ </td>
+ </tr>
+ </tbody>
+ </table>
+ </div>
+ </div>
+ </fieldset>
+ </div>
+ </body>
+</html>
746 jscouch.js
@@ -0,0 +1,746 @@
+/*
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * Mu Dynamics Research Labs wrote this file. As long as you retain this
+ * notice you can do whatever you want with this stuff. If we meet some day,
+ * and you think this stuff is worth it, you can buy us a beer in return.
+ *
+ * http://www.mudynamics.com
+ * http://labs.mudynamics.com
+ * http://www.pcapr.net
+ */
+(function($) {
+$(function() {
+ // Pretty much the same code in couch_view.erl, except this is JavaScript
+ // instead of Erlang.
+ var collator = function() {
+ return {
+ sorter: function(a, b) {
+ var tA = collator.type_sort(a);
+ var tB = collator.type_sort(b);
+ if (tA !== tB) {
+ return tA - tB;
+ }
+ return collator.less_same_type[tA](a, b);
+ },
+ type_sort: function(k) {
+ if (k === undefined || k === null || k === false || k === true) {
+ return 0;
+ }
+
+ if (typeof(k) === 'number') {
+ return 1;
+ }
+
+ if (typeof(k) === 'string') {
+ return 2;
+ }
+
+ if (Object.prototype.toString.apply(k) === '[object Array]') {
+ return 3;
+ }
+
+ return 4;
+ },
+ atom_sort: function(k) {
+ if (k === undefined) {
+ return 0;
+ }
+
+ if (k === null) {
+ return 1;
+ }
+
+ if (k === false) {
+ return 2;
+ }
+
+ return 3;
+ },
+ less_same_type: [
+ function(atomA, atomB) {
+ return collator.atom_sort(atomA) - collator.atom_sort(atomB);
+ },
+ function(numberA, numberB) {
+ return numberA - numberB;
+ },
+ function(stringA, stringB) {
+ return stringA < stringB ? -1 : stringA > stringB ? 1 : 0;
+ },
+ function(arrayA, arrayB) {
+ for (var i=0; i<arrayA.length; ++i) {
+ var eA = arrayA[i];
+ var tA = collator.type_sort(eA);
+ var eB = arrayB[i];
+ var tB = collator.type_sort(eB);
+ if (eB === undefined) {
+ return 1;
+ }
+
+ if (tA === tB) {
+ var val = collator.less_same_type[tA](eA, eB);
+ if (val !== 0) {
+ return val;
+ }
+ } else {
+ return tA - tB;
+ }
+ }
+
+ return 0;
+ },
+ function(objA, objB) {
+ var aryA = [];
+ for (var i in objA) { aryA.push([i, objA[i]]); }
+ var aryB = [];
+ for (var j in objB) { aryB.push([j, objB[j]]); }
+ return collator.less_same_type[3](aryA, aryB);
+ }
+ ]
+ };
+ }();
+
+ // The 'database' containing a list of JSON documents which also supports
+ // map/reduce but with hooks to visualize the results
+ var couch = function() {
+ var dbobj = {};
+ var nextid = 0;
+ var docs = [];
+
+ var mapkv = [];
+ var emit = function(k, v) {
+ var last = mapkv[mapkv.length-1];
+ last.kv.push([k || null, v || null]);
+ };
+
+ var log = function(obj) {
+ alert(JSON.stringify(obj));
+ };
+
+ return $.extend(dbobj, {
+ clear: function() {
+ docs = [];
+ nextid = 0;
+ return dbobj;
+ },
+ put: function(doc) {
+ doc._id = '' + (++nextid);
+ doc._rev = '1';
+ docs.push(doc);
+ return dbobj;
+ },
+ each: function(fn) {
+ $.each(docs, fn);
+ return dbobj;
+ },
+ map: function(mapfnval) {
+ mapkv = [];
+ var mapfn = eval('foo=(function(doc) {' + mapfnval + '})');
+ couch.each(function(index, doc) {
+ mapkv.push({ doc: doc, kv: [] });
+ mapfn(doc);
+ });
+
+ var maprs = [];
+ $.each(mapkv, function(i1, e1) {
+ $.each(e1.kv, function(i2, e2) {
+ maprs.push({ id: e1.doc._id, key: e2[0], value: e2[1] });
+ });
+ });
+
+ maprs.sort(function(d1, d2) {
+ return collator.sorter(d1.key, d2.key);
+ });
+ return maprs;
+ },
+ reduce: function(maprs, redfnval) {
+ var groups = [];
+ var sum = function(values) {
+ var rv = 0;
+ for (var i in values) {
+ rv += values[i];
+ }
+ return rv;
+ };
+
+ // First group the values by key (we use the collator to group
+ // equivalent keys)
+ $.each(maprs, function(i, e) {
+ var last = groups[groups.length-1] || null;
+ if (last && collator.sorter(last.key[0][0], e.key) === 0) {
+ last.key.push([e.key, e.id]);
+ last.value.push(e.value);
+ return;
+ }
+
+ groups.push({ key: [ [e.key,e.id] ], value: [ e.value ]});
+ });
+
+ // Then run each of the keys through the reduce function. If a
+ // given group has more than 2 keys, then we invoke rereduce
+ // just to illustrate how rereduce works
+ var redfn = eval('foo=(function(keys, values, rereduce) {' + redtxt.val() + '})');
+ $.each(groups, function(i, e) {
+ if (e.value.length > 2) {
+ var k1 = e.key.slice(0, e.key.length/2);
+ var v1 = e.value.slice(0, e.value.length/2);
+ var rv1 = redfn(k1, v1) || null;
+
+ var k2 = e.key.slice(e.key.length/2);
+ var v2 = e.value.slice(e.value.length/2);
+ var rv2 = redfn(k2, v2) || null;
+
+ e.value = redfn(null, [ rv1, rv2 ], true);
+ } else {
+ e.value = redfn(e.key, e.value) || null;
+ }
+
+ e.count = e.key.length;
+ e.key = e.key[0][0];
+ });
+
+ return groups;
+ }
+ });
+ }();
+
+ // syntax highlighter (works with JSON.stringify)
+ var highlighter = function(key, value) {
+ if (typeof(value) === 'string') {
+ value = value.replace(/&/g, '&amp;')
+ .replace(/>/g, '&gt;')
+ .replace(/</g, '&lt;')
+ .replace(/"/g, '&quot;');
+ return '<span class=jstring>' + value + '</span>';
+ }
+
+ if (typeof(value) === 'number') {
+ return '<span class=jnumber>' + value + '</span>';
+ }
+
+ if (value === null) {
+ return '<span class=jkeyword>null</span>';
+ }
+
+ return value;
+ };
+
+ // convert a JSON object into HTML with embedded spans
+ var htmlify = function(obj, indent) {
+ var html = JSON.stringify(obj, highlighter, indent);
+ var rekword = new RegExp('"(<span class=jkeyword>null</span>)"', 'g');
+ var renumbr = new RegExp('"(<span class=jnumber>[^<]+</span>)"', 'g');
+ return html.replace(rekword, '$1').replace(renumbr, '$1');
+ };
+
+ // setup the tabs
+ var fieldset = $('fieldset#tabs');
+ var legend = fieldset.find('legend');
+ var pane = fieldset.find('div#pane');
+ var links = legend.find('a');
+ links.click(function() {
+ links.removeClass('active');
+ $(this).addClass('active');
+ pane.children().css('display', 'none').end()
+ .find('div#' + $(this).attr('id')).css('display', '');
+ }).eq(0).click();
+
+ // add a new document
+ $('a#add').click(function() {
+ $(this).nextAll('div#doc')
+ .find('span.warn').empty().end()
+ .slideToggle();
+ });
+
+ // add a document to the doc table
+ var doctbody = $('table#docs tbody').empty();
+ var addDocToTable = function(doc) {
+ var _id, _rev, _doc = {};
+ $.each(doc, function(key, val) {
+ key === '_id' ? _id = val : key === '_rev' ? _rev = val : _doc[key] = val;
+ });
+
+ $(doctbody).append(
+ '<tr>' +
+ '<td>' + _id + '</td>' +
+ '<td>' + htmlify(_doc) + '</td>' +
+ '</tr>'
+ );
+ };
+
+ $('div#doc input').click(function() {
+ var text = $(this).parent().prevAll('textarea').val();
+ try {
+ var doc = JSON.parse(text);
+ couch.put(doc);
+ $('div#doc').slideToggle();
+ addDocToTable(doc);
+ } catch(e) {
+ $('div#doc span.warn').text("need a proper json object");
+ }
+ });
+
+ var mapdiv = pane.find('div#map');
+ var maptxt = mapdiv.find('textarea#map');
+ var redtxt = mapdiv.find('textarea#reduce');
+ var aexec = mapdiv.find('a#execute');
+ var bottom = mapdiv.find('table#bottom');
+ var rstbl = mapdiv.find('table#results').empty();
+ var rsdiv = mapdiv.find('div#response').empty();
+
+ var vwslct = mapdiv.find('select#view');
+
+ // display the results based on the view parameters
+ var filterAndView = function() {
+ var result = couch.groups || couch.maprs;
+ if (!result) {
+ return;
+ }
+
+ var rstxt = ['{<br/>'];
+ if (couch.groups === null) {
+ rstxt.push('&nbsp;&nbsp;&nbsp;&nbsp;');
+ rstxt.push('"total_rows": ' + couch.maprs.length + ',<br/>');
+ }
+
+ var query = vwslct.val();
+ if (query === 'key') {
+ try {
+ var key = mapdiv.find('input#key').val();
+ key = key.length === 0 ? null : JSON.parse(key);
+ if (key) {
+ result = $.map(result, function(row) {
+ return collator.sorter(row.key, key) === 0 ? row : null;
+ });
+ }
+ } catch(e) {
+ result = [];
+ }
+ } else if (query === 'range') {
+ var startkey = null;
+ try {
+ var startkey = mapdiv.find('input#startkey').val();
+ startkey = startkey.length === 0 ? null : JSON.parse(startkey);
+ var endkey = mapdiv.find('input#endkey').val();
+ endkey = endkey.length === 0 ? null : JSON.parse(endkey);
+
+ result = $.map(result, function(row) {
+ var start = startkey ? collator.sorter(row.key, startkey) >= 0 : true;
+ var end = endkey ? collator.sorter(row.key, endkey) <= 0 : true;
+ return (start && end) ? row : null;
+ });
+ } catch(e) {
+ result = [];
+ }
+ }
+
+ rstxt.push('&nbsp;&nbsp;&nbsp;&nbsp;');
+ rstxt.push('"rows": [<br/>');
+ $.each(result, function(i, e) {
+ rstxt.push('&nbsp;&nbsp;&nbsp;&nbsp;');
+ rstxt.push('&nbsp;&nbsp;&nbsp;&nbsp;');
+ rstxt.push(htmlify(e));
+ rstxt.push(i < result.length - 1 ? ',<br/>' : '<br/>');
+ });
+ rstxt.push('&nbsp;&nbsp;&nbsp;&nbsp;');
+ rstxt.push(' ]<br/>');
+ rstxt.push('}<br/>');
+
+ rsdiv.html(rstxt.join(''));
+ };
+
+ // recompute the results if the query parameters change
+ vwslct.change(function() {
+ var val = $(this).val();
+ var views = $(this).next('span#views');
+ views.children().css('display', 'none').end()
+ .find('span#' + val).css('display', '');
+ filterAndView();
+ });
+
+ // recompute the view result when the query parameters change
+ pane.find('input#key,input#startkey,input#endkey').keyup(function() {
+ var val = $(this).val();
+ try {
+ if (val.length !== 0) {
+ JSON.parse($(this).val());
+ }
+ filterAndView();
+ $(this).css('color', 'black');
+ } catch(e) {
+ $(this).css('color', 'red');
+ }
+ });
+
+ // do the map/reduce bit
+ aexec.click(function() {
+ var warn = mapdiv.find('span.warn').text('');
+ rstbl.empty();
+ bottom.hide();
+
+ // reset the results from the last query
+ couch.maprs = null;
+ couch.groups = null;
+ vwslct.attr('selectedIndex', 0).triggerHandler('change');
+
+ // map the documents
+ var maprs = null;
+ try {
+ maprs = couch.map(maptxt.val());
+ } catch(e) {
+ warn.text('map: ' + e.toString());
+ return;
+ }
+
+ // reduce the values (if there is a reduce function)
+ var groups = null;
+ if (redtxt.val().replace(/\s+/g, '').length > 0) {
+ try {
+ groups = couch.reduce(maprs, redtxt.val());
+ } catch(e) {
+ warn.text('reduce: ' + e.toString());
+ return;
+ }
+ }
+
+ couch.maprs = maprs;
+ couch.groups = groups;
+
+ // and then render the results
+ var tblhead = [];
+ tblhead.push('<thead><tr><td>id</td><td>key</td><td>value</td>');
+ if (groups) {
+ tblhead.push('<td>&raquo;&nbsp;reduced</td>');
+ }
+ tblhead.push('</tr></thead>');
+
+ var tblbody = [];
+ tblbody.push('<tbody>');
+ var gindex = 0;
+ $.each(maprs, function(index, obj) {
+ tblbody.push('<tr>');
+ tblbody.push('<td>' + obj.id + '</td>');
+ tblbody.push('<td>' + htmlify(obj.key) + '</td>');
+ tblbody.push('<td>' + htmlify(obj.value) + '</td>');
+
+ if (groups && gindex < groups.length) {
+ var first = groups[gindex];
+ if (collator.sorter(obj.key, first.key) === 0) {
+ gindex++;
+ tblbody.push(
+ '<td class="reduced" rowspan="' + first.count + '">' +
+ '&raquo;&nbsp;' + htmlify(first.value) +
+ '</td>'
+ );
+
+ delete first.count;
+ }
+ }
+
+ tblbody.push('</tr>');
+ });
+ tblbody.push('</tbody>');
+
+ rstbl.append(tblhead.join('')).append(tblbody.join(''));
+ if (groups) {
+ rstbl.find('td.reduced')
+ .prevAll('td').css('border-top', '2px dotted gray').end()
+ .end()
+ .find('tbody tr:last td:not(.reduced)')
+ .css('border-bottom', '2px dotted gray')
+ .end();
+ }
+
+ filterAndView();
+ bottom.show();
+ });
+
+ var examples = [
+ {
+ name: "sorting pictures by user",
+ blurb: "In this simple example, we want to sort all the " +
+ "pictures by the user so we can present that in a UI of some " +
+ "sort. So for this we use just the map function which " +
+ "<strong>emit</strong>s one key for each document.",
+ action: function() {
+ maptxt.val('emit(doc.user, null)');
+ redtxt.val('');
+ }
+ },
+ {
+ name: "sorting pictures by date",
+ blurb: "In this simple example, we want to sort all the " +
+ "pictures by date so we can present that in a UI of some " +
+ "sort. So we use just the map function which " +
+ "<strong>emit</strong>s one key/value pair for each of the " +
+ "document.",
+ action: function() {
+ maptxt.val('emit(Date.parse(doc.created_at), null)');
+ redtxt.val('');
+ }
+ },
+ {
+ name: 'total size of all images',
+ blurb: "All we want is to add up the <em>doc.info.size</em> " +
+ "fields across all documents. So we now use the " +
+ "<strong>reduce</strong> function to do this aggregation. " +
+ "CouchDB provides a <strong>sum</strong> function, but " +
+ "we could add others too.",
+ action: function() {
+ maptxt.val('emit("size", doc.info.size);');
+ redtxt.val('return sum(values);');
+ }
+ },
+ {
+ name: "counting pictures by users",
+ blurb: "Unlike the last example, we are now going to " +
+ "<strong>emit</strong> the name of the user as well as a " +
+ "value of 1. Then we are going to reduce the values for " +
+ "each user to sum of all the values. CouchDB provides a " +
+ "<strong>sum</strong> function, but we could add others " +
+ "too.",
+ action: function() {
+ maptxt.val('emit(doc.user, 1);');
+ redtxt.val('return sum(values);');
+ }
+ },
+ {
+ name: 'counting pictures by hour',
+ blurb: "The key used in <strong>emit</strong> doesn't have to " +
+ "be something in the document. New keys and new values can " +
+ "be derived. Notice how we are taking the create_at date and " +
+ "converting it into hours (since 1971). During the query, " +
+ "this allows us to extract data for specific time slices.",
+ action: function() {
+ maptxt.val('emit(Math.floor(Date.parse(doc.created_at)/1000/60/60), 1);');
+ redtxt.val('return sum(values);');
+ }
+ },
+ {
+ name: 'computing min width/height',
+ blurb: 'Another important concept is that the map function can ' +
+ '<strong>emit</strong> more than one key/value pair for ' +
+ 'a given document. But since the keys are grouped together, ' +
+ 'you can reduce them independently.',
+ action: function() {
+ maptxt.val(
+ 'emit("width", doc.info.width);\r\n' +
+ 'emit("height", doc.info.height);'
+ );
+ redtxt.val(
+ 'var rv=null;\r\n' +
+ 'for (i=0; i<values.length; ++i) {\r\n' +
+ ' rv = Math.min(values[i], rv || values[i]);\r\n' +
+ '}\r\n' +
+ 'return rv;'
+ );
+ }
+ },
+ {
+ name: 'computing min AND max width/height',
+ blurb: 'In the last example, we reduced the min of width and ' +
+ 'height. What if we wanted to compute both the min and the ' +
+ 'max in one go? The answer is by using <em>complex</em> ' +
+ 'values. Notice that the reduce function returns a value ' +
+ "that looks very similar to what the map emits.",
+ action: function() {
+ maptxt.val(
+ 'emit("width", { min: doc.info.width, max: doc.info.width });\r\n' +
+ 'emit("height", { min: doc.info.height, max: doc.info.height });'
+ );
+ redtxt.val(
+ 'var rv = { min: null, max: null };\r\n' +
+ 'for (i=0; i<values.length; ++i) {\r\n' +
+ ' var value = values[i];\r\n' +
+ ' rv.min = Math.min(value.min, rv.min || value.min);\r\n' +
+ ' rv.max = Math.max(value.max, rv.max || value.max);\r\n' +
+ '}\r\n' +
+ 'return rv;'
+ );
+ }
+ },
+ {
+ name: 'unique cameras for a user (attempt #1)',
+ blurb: 'We want to find out what kind of cameras a given user ' +
+ "has used when uploading pictures. This one uses " +
+ "<strong>reduce</strong> to find that out. But be aware that " +
+ "this could make CouchDB pretty slow especially if the " +
+ "#cameras per user is not bounded.",
+ action: function() {
+ maptxt.val(
+ 'var val = {};\r\n' +
+ 'val[doc.camera] = 1;\r\n' +
+ 'emit(doc.user, val);'
+ );
+ redtxt.val(
+ 'var rv = {};\r\n' +
+ 'for (i in values) {\r\n' +
+ ' var value = values[i];\r\n' +
+ ' for (k in value) {\r\n' +
+ ' rv[k] = (rv[k] || 0) + value[k];\r\n' +
+ ' }\r\n' +
+ '}\r\n' +
+ 'return rv;'
+ );
+ }
+ },
+ {
+ name: 'unique cameras for a user (attempt #2)',
+ blurb: "In this approach, we use [user, camera] as the unique " +
+ "key and reduce that to get our answers. This approach tends " +
+ "to scale better as the number of unique values grows. The " +
+ "downside is that the client has to setup the query properly " +
+ "using <strong>startkey</strong>/<strong>endkey</strong> " +
+ "to get at the unique values.",
+ action: function() {
+ maptxt.val('emit([doc.user, doc.camera], 1);');
+ redtxt.val('return sum(values);');
+ }
+ },
+ {
+ name: "counting pictures by users (advanced)",
+ blurb: "This example demonstrates the <strong>rereduce</strong> " +
+ "option in the reduce function. CouchDB doesn't necessarily " +
+ "pass in all the values for a <em>unique</em> key to the " +
+ "<strong>reduce</strong> function. This means that the " +
+ "reduce function needs to handle values potentially being " +
+ "an array of previous outputs. Since " +
+ "this is an emulator that runs within the browser, we've " +
+ "mapped the <strong>log</strong> method that CouchDB " +
+ "provides into <em>window.alert</em>, so you can see " +
+ "how map/reduce works. You need to " +
+ "explicitly click on the <strong><em>execute</em></strong> " +
+ "link below, which will trigger 5 alerts.",
+ action: function() {
+ mapdiv.find('span.warn').text('');
+ rstbl.empty();
+ rsdiv.empty();
+ bottom.hide();
+ maptxt.val('emit(doc.user, 1);');
+ redtxt.val(
+ 'log([ keys, values, rereduce ]);\r\n' +
+ 'return sum(values);'
+ );
+ return false;
+ }
+ }
+ ];
+
+ // load the examples
+ var exslct = mapdiv.find('select#examples');
+ var blrdiv = mapdiv.find('div#blurb');
+ $.each(examples, function(index, e) {
+ exslct.append('<option>' + e.name + '</option>');
+ });
+
+ // and run them when clicked on
+ exslct.change(function() {
+ blrdiv.slideUp(function() {
+ var index = exslct.attr('selectedIndex');
+ if (index > 0) {
+ blrdiv.html(examples[index-1].blurb);
+ var rv = examples[index-1].action();
+ blrdiv.slideDown(function() {
+ if (rv !== false) {
+ aexec.click();
+ }
+ });
+ }
+ });
+ });
+
+ // feedback while entering a new JSON doc
+ pane.find('textarea#doc').keyup(function() {
+ try {
+ JSON.parse($(this).val());
+ $(this).css('color', 'black');
+ } catch(e) {
+ $(this).css('color', 'red');
+ }
+ });
+
+ // popluate the DB with initial entries
+ var now = new Date().getTime();
+ var millisInHHour = 1000*60*30;
+ couch.put({
+ name: 'fish.jpg',
+ created_at: new Date(now + millisInHHour*Math.random()).toUTCString(),
+ user: 'bob',
+ type: 'jpeg',
+ camera: 'nikon',
+ info: {
+ width: 100,
+ height: 200,
+ size: 12345
+ },
+ tags: [ 'tuna', 'shark' ]
+ });
+ couch.put({
+ name: 'trees.jpg',
+ created_at: new Date(now + millisInHHour*Math.random()).toUTCString(),
+ user: 'john',
+ type: 'jpeg',
+ camera: 'canon',
+ info: {
+ width: 30,
+ height: 250,
+ size: 32091
+ },
+ tags: [ 'oak' ]
+ });
+ couch.put({
+ name: 'snow.png',
+ created_at: new Date(now + millisInHHour*Math.random()).toUTCString(),
+ user: 'john',
+ type: 'png',
+ camera: 'canon',
+ info: {
+ width: 64,
+ height: 64,
+ size: 1253
+ },
+ tags: [ 'tahoe', 'powder' ]
+ });
+ couch.put({
+ name: 'hawaii.png',
+ created_at: new Date(now + millisInHHour*Math.random()).toUTCString(),
+ user: 'john',
+ type: 'png',
+ camera: 'nikon',
+ info: {
+ width: 128,
+ height: 64,
+ size: 92834
+ },
+ tags: [ 'maui', 'tuna' ]
+ });
+ couch.put({
+ name: 'hawaii.gif',
+ created_at: new Date(now + millisInHHour*Math.random()).toUTCString(),
+ user: 'bob',
+ type: 'gif',
+ camera: 'canon',
+ info: {
+ width: 320,
+ height: 128,
+ size: 49287
+ },
+ tags: [ 'maui' ]
+ });
+ couch.put({
+ name: 'island.gif',
+ created_at: new Date(now + millisInHHour*Math.random()).toUTCString(),
+ user: 'zztop',
+ type: 'gif',
+ camera: 'nikon',
+ info: {
+ width: 640,
+ height: 480,
+ size: 50398
+ },
+ tags: [ 'maui' ]
+ });
+
+ // populate the initial docs to the UI
+ couch.each(function(index, doc) { addDocToTable(doc); });
+});
+})(jQuery);
478 json2.js
@@ -0,0 +1,478 @@
+/*
+ http://www.JSON.org/json2.js
+ 2008-11-19
+
+ Public Domain.
+
+ NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
+
+ See http://www.JSON.org/js.html
+
+ This file creates a global JSON object containing two methods: stringify
+ and parse.
+
+ JSON.stringify(value, replacer, space)
+ value any JavaScript value, usually an object or array.
+
+ replacer an optional parameter that determines how object
+ values are stringified for objects. It can be a
+ function or an array of strings.
+
+ space an optional parameter that specifies the indentation
+ of nested structures. If it is omitted, the text will
+ be packed without extra whitespace. If it is a number,
+ it will specify the number of spaces to indent at each
+ level. If it is a string (such as '\t' or '&nbsp;'),
+ it contains the characters used to indent at each level.
+
+ This method produces a JSON text from a JavaScript value.
+
+ When an object value is found, if the object contains a toJSON
+ method, its toJSON method will be called and the result will be
+ stringified. A toJSON method does not serialize: it returns the
+ value represented by the name/value pair that should be serialized,
+ or undefined if nothing should be serialized. The toJSON method
+ will be passed the key associated with the value, and this will be
+ bound to the object holding the key.
+
+ For example, this would serialize Dates as ISO strings.
+
+ Date.prototype.toJSON = function (key) {
+ function f(n) {
+ // Format integers to have at least two digits.
+ return n < 10 ? '0' + n : n;
+ }
+
+ return this.getUTCFullYear() + '-' +
+ f(this.getUTCMonth() + 1) + '-' +
+ f(this.getUTCDate()) + 'T' +
+ f(this.getUTCHours()) + ':' +
+ f(this.getUTCMinutes()) + ':' +
+ f(this.getUTCSeconds()) + 'Z';
+ };
+
+ You can provide an optional replacer method. It will be passed the
+ key and value of each member, with this bound to the containing
+ object. The value that is returned from your method will be
+ serialized. If your method returns undefined, then the member will
+ be excluded from the serialization.
+
+ If the replacer parameter is an array of strings, then it will be
+ used to select the members to be serialized. It filters the results
+ such that only members with keys listed in the replacer array are
+ stringified.
+
+ Values that do not have JSON representations, such as undefined or
+ functions, will not be serialized. Such values in objects will be
+ dropped; in arrays they will be replaced with null. You can use
+ a replacer function to replace those with JSON values.
+ JSON.stringify(undefined) returns undefined.
+
+ The optional space parameter produces a stringification of the
+ value that is filled with line breaks and indentation to make it
+ easier to read.
+
+ If the space parameter is a non-empty string, then that string will
+ be used for indentation. If the space parameter is a number, then
+ the indentation will be that many spaces.
+
+ Example:
+
+ text = JSON.stringify(['e', {pluribus: 'unum'}]);
+ // text is '["e",{"pluribus":"unum"}]'
+
+
+ text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t');
+ // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
+
+ text = JSON.stringify([new Date()], function (key, value) {
+ return this[key] instanceof Date ?
+ 'Date(' + this[key] + ')' : value;
+ });
+ // text is '["Date(---current time---)"]'
+
+
+ JSON.parse(text, reviver)
+ This method parses a JSON text to produce an object or array.
+ It can throw a SyntaxError exception.
+
+ The optional reviver parameter is a function that can filter and
+ transform the results. It receives each of the keys and values,
+ and its return value is used instead of the original value.
+ If it returns what it received, then the structure is not modified.
+ If it returns undefined then the member is deleted.
+
+ Example:
+
+ // Parse the text. Values that look like ISO date strings will
+ // be converted to Date objects.
+
+ myData = JSON.parse(text, function (key, value) {
+ var a;
+ if (typeof value === 'string') {
+ a =
+/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
+ if (a) {
+ return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
+ +a[5], +a[6]));
+ }
+ }
+ return value;
+ });
+
+ myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) {
+ var d;
+ if (typeof value === 'string' &&
+ value.slice(0, 5) === 'Date(' &&
+ value.slice(-1) === ')') {
+ d = new Date(value.slice(5, -1));
+ if (d) {
+ return d;
+ }
+ }
+ return value;
+ });
+
+
+ This is a reference implementation. You are free to copy, modify, or
+ redistribute.
+
+ This code should be minified before deployment.
+ See http://javascript.crockford.com/jsmin.html
+
+ USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
+ NOT CONTROL.
+*/
+
+/*jslint evil: true */
+
+/*global JSON */
+
+/*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply,
+ call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours,
+ getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join,
+ lastIndex, length, parse, prototype, push, replace, slice, stringify,
+ test, toJSON, toString, valueOf
+*/
+
+// Create a JSON object only if one does not already exist. We create the
+// methods in a closure to avoid creating global variables.
+
+if (!this.JSON) {
+ JSON = {};
+}
+(function () {
+
+ function f(n) {
+ // Format integers to have at least two digits.
+ return n < 10 ? '0' + n : n;
+ }
+
+ if (typeof Date.prototype.toJSON !== 'function') {
+
+ Date.prototype.toJSON = function (key) {
+
+ return this.getUTCFullYear() + '-' +
+ f(this.getUTCMonth() + 1) + '-' +
+ f(this.getUTCDate()) + 'T' +
+ f(this.getUTCHours()) + ':' +
+ f(this.getUTCMinutes()) + ':' +
+ f(this.getUTCSeconds()) + 'Z';
+ };
+
+ String.prototype.toJSON =
+ Number.prototype.toJSON =
+ Boolean.prototype.toJSON = function (key) {
+ return this.valueOf();
+ };
+ }
+
+ var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
+ escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
+ gap,
+ indent,
+ meta = { // table of character substitutions
+ '\b': '\\b',
+ '\t': '\\t',
+ '\n': '\\n',
+ '\f': '\\f',
+ '\r': '\\r',
+ '"' : '\\"',
+ '\\': '\\\\'
+ },
+ rep;
+
+
+ function quote(string) {
+
+// If the string contains no control characters, no quote characters, and no
+// backslash characters, then we can safely slap some quotes around it.
+// Otherwise we must also replace the offending characters with safe escape
+// sequences.
+
+ escapable.lastIndex = 0;
+ return escapable.test(string) ?
+ '"' + string.replace(escapable, function (a) {
+ var c = meta[a];
+ return typeof c === 'string' ? c :
+ '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
+ }) + '"' :
+ '"' + string + '"';
+ }
+
+
+ function str(key, holder) {
+
+// Produce a string from holder[key].
+
+ var i, // The loop counter.
+ k, // The member key.
+ v, // The member value.
+ length,
+ mind = gap,
+ partial,
+ value = holder[key];
+
+// If the value has a toJSON method, call it to obtain a replacement value.
+
+ if (value && typeof value === 'object' &&
+ typeof value.toJSON === 'function') {
+ value = value.toJSON(key);
+ }
+
+// If we were called with a replacer function, then call the replacer to
+// obtain a replacement value.
+
+ if (typeof rep === 'function') {
+ value = rep.call(holder, key, value);
+ }
+
+// What happens next depends on the value's type.
+
+ switch (typeof value) {
+ case 'string':
+ return quote(value);
+
+ case 'number':
+
+// JSON numbers must be finite. Encode non-finite numbers as null.
+
+ return isFinite(value) ? String(value) : 'null';
+
+ case 'boolean':
+ case 'null':
+
+// If the value is a boolean or null, convert it to a string. Note:
+// typeof null does not produce 'null'. The case is included here in
+// the remote chance that this gets fixed someday.
+
+ return String(value);
+
+// If the type is 'object', we might be dealing with an object or an array or
+// null.
+
+ case 'object':
+
+// Due to a specification blunder in ECMAScript, typeof null is 'object',
+// so watch out for that case.
+
+ if (!value) {
+ return 'null';
+ }
+
+// Make an array to hold the partial results of stringifying this object value.
+
+ gap += indent;
+ partial = [];
+
+// Is the value an array?
+
+ if (Object.prototype.toString.apply(value) === '[object Array]') {
+
+// The value is an array. Stringify every element. Use null as a placeholder
+// for non-JSON values.
+
+ length = value.length;
+ for (i = 0; i < length; i += 1) {
+ partial[i] = str(i, value) || 'null';
+ }
+
+// Join all of the elements together, separated with commas, and wrap them in
+// brackets.
+
+ v = partial.length === 0 ? '[]' :
+ gap ? '[\n' + gap +
+ partial.join(',\n' + gap) + '\n' +
+ mind + ']' :
+ '[' + partial.join(',') + ']';
+ gap = mind;
+ return v;
+ }
+
+// If the replacer is an array, use it to select the members to be stringified.
+
+ if (rep && typeof rep === 'object') {
+ length = rep.length;
+ for (i = 0; i < length; i += 1) {
+ k = rep[i];
+ if (typeof k === 'string') {
+ v = str(k, value);
+ if (v) {
+ partial.push(quote(k) + (gap ? ': ' : ':') + v);
+ }
+ }
+ }
+ } else {
+
+// Otherwise, iterate through all of the keys in the object.
+
+ for (k in value) {
+ if (Object.hasOwnProperty.call(value, k)) {
+ v = str(k, value);
+ if (v) {
+ partial.push(quote(k) + (gap ? ': ' : ':') + v);
+ }
+ }
+ }
+ }
+
+// Join all of the member texts together, separated with commas,
+// and wrap them in braces.
+
+ v = partial.length === 0 ? '{}' :
+ gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' +
+ mind + '}' : '{' + partial.join(',') + '}';
+ gap = mind;
+ return v;
+ }
+ }
+
+// If the JSON object does not yet have a stringify method, give it one.
+
+ if (typeof JSON.stringify !== 'function') {
+ JSON.stringify = function (value, replacer, space) {
+
+// The stringify method takes a value and an optional replacer, and an optional
+// space parameter, and returns a JSON text. The replacer can be a function
+// that can replace values, or an array of strings that will select the keys.
+// A default replacer method can be provided. Use of the space parameter can
+// produce text that is more easily readable.
+
+ var i;
+ gap = '';
+ indent = '';
+
+// If the space parameter is a number, make an indent string containing that
+// many spaces.
+
+ if (typeof space === 'number') {
+ for (i = 0; i < space; i += 1) {
+ indent += ' ';
+ }
+
+// If the space parameter is a string, it will be used as the indent string.
+
+ } else if (typeof space === 'string') {
+ indent = space;
+ }
+
+// If there is a replacer, it must be a function or an array.
+// Otherwise, throw an error.
+
+ rep = replacer;
+ if (replacer && typeof replacer !== 'function' &&
+ (typeof replacer !== 'object' ||
+ typeof replacer.length !== 'number')) {
+ throw new Error('JSON.stringify');
+ }
+
+// Make a fake root object containing our value under the key of ''.
+// Return the result of stringifying the value.
+
+ return str('', {'': value});
+ };
+ }
+
+
+// If the JSON object does not yet have a parse method, give it one.
+
+ if (typeof JSON.parse !== 'function') {
+ JSON.parse = function (text, reviver) {
+
+// The parse method takes a text and an optional reviver function, and returns
+// a JavaScript value if the text is a valid JSON text.
+
+ var j;
+
+ function walk(holder, key) {
+
+// The walk method is used to recursively walk the resulting structure so
+// that modifications can be made.
+
+ var k, v, value = holder[key];
+ if (value && typeof value === 'object') {
+ for (k in value) {
+ if (Object.hasOwnProperty.call(value, k)) {
+ v = walk(value, k);
+ if (v !== undefined) {
+ value[k] = v;
+ } else {
+ delete value[k];
+ }
+ }
+ }
+ }
+ return reviver.call(holder, key, value);
+ }
+
+
+// Parsing happens in four stages. In the first stage, we replace certain
+// Unicode characters with escape sequences. JavaScript handles many characters
+// incorrectly, either silently deleting them, or treating them as line endings.
+
+ cx.lastIndex = 0;
+ if (cx.test(text)) {
+ text = text.replace(cx, function (a) {
+ return '\\u' +
+ ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
+ });
+ }
+
+// In the second stage, we run the text against regular expressions that look
+// for non-JSON patterns. We are especially concerned with '()' and 'new'
+// because they can cause invocation, and '=' because it can cause mutation.
+// But just to be safe, we want to reject all unexpected forms.
+
+// We split the second stage into 4 regexp operations in order to work around
+// crippling inefficiencies in IE's and Safari's regexp engines. First we
+// replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
+// replace all simple value tokens with ']' characters. Third, we delete all
+// open brackets that follow a colon or comma or that begin the text. Finally,
+// we look to see that the remaining characters are only whitespace or ']' or
+// ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
+
+ if (/^[\],:{}\s]*$/.
+test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@').
+replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').
+replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
+
+// In the third stage we use the eval function to compile the text into a
+// JavaScript structure. The '{' operator is subject to a syntactic ambiguity
+// in JavaScript: it can begin a block or an object literal. We wrap the text
+// in parens to eliminate the ambiguity.
+
+ j = eval('(' + text + ')');
+
+// In the optional fourth stage, we recursively walk the new structure, passing
+// each name/value pair to a reviver function for possible transformation.
+
+ return typeof reviver === 'function' ?
+ walk({'': j}, '') : j;
+ }
+
+// If the text is not JSON parseable, then a SyntaxError is thrown.
+
+ throw new SyntaxError('JSON.parse');
+ };
+ }
+})();
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