added tags to the document

dist/flexsearch.compact.js

@@ -0,0 +1,24 @@
+/**!
+ * FlexSearch.js v0.7.0-pre-alpha (Compact)
+ * Copyright 2019 Nextapps GmbH
+ * Author: Thomas Wilkerling
+ * Licence: Apache-2.0
+ * https://github.com/nextapps-de/flexsearch
+ */
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dist/flexsearch.light.js

@@ -0,0 +1,17 @@
+/**!
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+ * Copyright 2019 Nextapps GmbH
+ * Author: Thomas Wilkerling
+ * Licence: Apache-2.0
+ * https://github.com/nextapps-de/flexsearch
+ */
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dist/flexsearch.min.js

@@ -1,25 +1,28 @@
 /**!
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  * Copyright 2019 Nextapps GmbH
  * Author: Thomas Wilkerling
  * Licence: Apache-2.0
  * https://github.com/nextapps-de/flexsearch
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+function fa(a,b,c,d,f,h,e,g){var k=[],l=g?a.i:a.g;a.m||(l=ha(l,e,g,a.v));if(l){var r=0;d=Math.min(l.length,d);for(var p=0,n=0,m;p<d&&!(m=l[p],a.m&&(m=ha(m,e,g,a.v)),m&&(k[r++]=m,h&&(n+=m.length,n>=f)));p++);if(r){if(h)return k=1===r?k[0]:[].concat.apply([],k),k.length>f?k.slice(0,f):k;b[b.length]=k;return}}return!c&&k}q.contain=function(a){return!!this.register[a]};q.update=function(a,b){return this.remove(a).add(a,b)};
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+q.remove=function(a,b){var c=this.register[a];if(c){if(this.s)for(var d=0,f;d<c.length;d++)f=c[d],f.splice(f.indexOf(a),1);else V(this.g,a,this.o-this.threshold,this.m),this.depth&&V(this.i,a,this.h-this.j,this.m);b||delete this.register[a];if(this.cache)for(b=this.cache,c=0;c<b.g.length;c++)f=b.g[c],d=b.cache[f],-1!==d.indexOf(a)&&(b.g.splice(c--,1),delete b.cache[f])}return this};
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+typeof e?Object.assign({},b,e):b):e=b,a[h]=new S(e,this.register),this.F[f]=X(h,this.i),this.h[f]=h;if(this.j)for(d=b.store,"string"===typeof d&&(d=[d]),b=0;b<d.length;b++)this.j[b]=X(d[b],this.i);this.A=a}function X(a,b){for(var c=a.split(":"),d=0,f=0;f<c.length;f++)a=c[f],0<=a.indexOf("[]")&&(a=a.substring(0,a.length-2))&&(b[d]=!0),a&&(c[d++]=a);d<c.length&&(c.length=d);return 1<d?c:c[0]}function ia(a,b){if("string"===typeof b)a=a[b];else for(var c=0;a&&c<b.length;c++)a=a[b[c]];return a}
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+function Y(a,b,c,d,f){a=a[f];if(d===c.length-1)b[f]=a;else if(a)if(a.constructor===Array)for(b=b[f]=Array(a.length),f=0;f<a.length;f++)Y(a,b,c,d,f);else b=b[f]||(b[f]=B()),f=c[++d],Y(a,b,c,d,f)}function Z(a,b,c,d,f,h,e,g){a=a[e];if(d===b.length-1){if(a.constructor===Array){if(c[d]){for(b=0;b<a.length;b++)f.add(h,a[b],!0);return}a=a.join(" ")}f.add(h,a,g)}else if(a)if(a.constructor===Array)for(e=0;e<a.length;e++)Z(a,b,c,d,f,h,e,g);else e=b[++d],Z(a,b,c,d,f,h,e,g)}q=W.prototype;
-r.add=function(a,b,c){if("object"===typeof a){a=b=a;var d=this.key;if("string"===typeof d)a=a[d];else for(var e=0;a&&e<d.length;e++)a=a[d[e]]}if(b&&(a||0===a)){if(this.register[a])return this.update(a,b);d=0;for(var h;d<this.g.length;d++)h=this.g[d],e=this.u[d],"string"===typeof e&&(e=[e]),Z(b,e,this.i,0,this.o[h],a,e[0],c);if(this.store){if(this.h){var f=x();for(c=0;c<this.h.length;c++)d=this.h[c],"string"===typeof d?f[d]=b[d]:Y(b,f,d,0,d[0])}this.store[a]=f||b}}return this};
+q.add=function(a,b,c){"object"===typeof a&&(b=a,a=ia(b,this.key));if(b&&(a||0===a)){if(this.register[a])return this.update(a,b);for(var d=0,f,h;d<this.h.length;d++)h=this.h[d],f=this.F[d],"string"===typeof f&&(f=[f]),Z(b,f,this.i,0,this.A[h],a,f[0],c);if(this.u){d=ia(b,this.u);f=B();"string"===typeof d&&(d=[d]);h=0;for(var e;h<d.length;h++)if(e=d[h],!f[e]&&(f[e]=1,e=this.g[e]||(this.g[e]=[]),!c||-1===e.indexOf(a)))if(e[e.length]=a,this.s){var g=this.register[a]||(this.register[a]=[]);g[g.length]=
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+e}}if(this.store){if(this.j){var k=B();for(c=0;c<this.j.length;c++)d=this.j[c],"string"===typeof d?k[d]=b[d]:Y(b,k,d,0,d[0])}this.store[a]=k||b}}return this};q.append=function(a,b){return this.add(a,b,!0)};q.update=function(a,b){return this.remove(a).add(a,b)};
-r.search=function(a,b,c){"object"===typeof a?(c=a,a=c.query):"object"===typeof b&&(c=b);var d=[],e,h=0;if(c){var f=(e=c.pluck)||c.field;var g=c.enrich;var k="and"===c.bool;b=c.limit}if(f)if("string"===typeof f)f=[f];else{if(f.constructor!==Array){var l=f;f=Object.keys(f)}}else f=this.g;k=k&&1<f.length;for(var p=0,m,n;p<f.length;p++){m=f[p];n=l?l[m]:c;m=this.o[m].search(a,b,n);if(k&&!m.length)return[];h+=m.length;d[p]=m}if(!h)return[];if(e&&(!g||!this.store))return d[0];for(a=0;a<f.length;a++){b=f[a];
+q.remove=function(a){"object"===typeof a&&(a=a[this.key]);if(this.register[a]){for(var b=0;b<this.h.length;b++)this.A[this.h[b]].remove(a,!0);if(this.u&&!this.s)for(var c in this.g){b=this.g[c];var d=b.indexOf(a);-1!==d&&(1<b.length?b.splice(d,1):delete this.g[c])}this.store&&delete this.store[a];delete this.register[a]}return this};
-c=d[a];if(g&&this.store){l=Array(c.length);for(k=0;k<c.length;k++)h=c[k],l[k]={key:h,doc:this.store[h]};c=l}if(e)return c;d[a]={field:b,result:c}}return d};r.get=function(a){return this.store[a]};r.set=function(a,b){this.store[a]=b;return this};r.contain=function(a){return!!this.register[a]};r.searchCache=O;r.addAsync=H;r.appendAsync=J;r.searchAsync=K;r.updateAsync=L;r.removeAsync=M;window.FlexSearch={Index:Q,Document:W,registerCharset:function(a,b){E[a]=b},registerLanguage:function(a,b){D[a]=b}};}).call(this);
+q.search=function(a,b,c){"object"===typeof a?(c=a,a=c.query):"object"===typeof b&&(c=b);var d=[],f,h=0;if(c){var e=(f=c.pluck)||c.field;var g=c.tag;var k=c.enrich;var l="and"===c.bool;b=c.limit;if(e)if("string"===typeof e)e=[e];else if(e.constructor!==Array){var r=e;e=Object.keys(e)}if(g&&("string"===typeof g&&(g=[g]),!a)){for(f=0;f<g.length;f++){e=g[f];var p=b||100;(c=(a=this.g[e])&&a.length)?(c>p&&(a=a.slice(0,p)),k&&this.store&&(a=ja.call(this,a)),e={tag:e,result:a}):e=void 0;e&&(d[d.length]=e,
+h++)}return h?d:[]}}e||(e=this.h);l=l&&(1<e.length||g&&1<g.length);p=[];for(var n=0,m,t,v;n<e.length;n++){t=e[n];m=this.A[t].search(a,b,r?r[t]:c);v=m.length;if(g&&v){var x=p[n]=[];t=[];var w=0;l&&(t[0]=[m]);for(var y=0,A,z;y<g.length;y++)if(A=g[y],v=(z=this.g[A])&&z.length)t[t.length]=l?[z]:z,x[w++]=A;if(w){if(l)t=P(t,b||100);else{w=m;m=B();v=B();x=[];for(y=0;y<w.length;y++)m[w[y]]=1;for(w=0;w<t.length;w++)for(y=t[w],A=0;A<y.length;A++)z=y[A],m[z]&&!v[z]&&(v[z]=1,x[x.length]=z);t=x}m=t;v=m.length}}if(v)d[h++]=
+m;else if(l)return[]}if(!h)return[];if(f&&(!k||!this.store))return d[0];for(b=0;b<e.length;b++){h=e[b];g=d[b];g.length&&k&&this.store&&(g=ja.call(this,g));if(f)return g;d[b]=g={field:h,result:g};this.u&&(g.tag=p[b])}return d};function ja(a){for(var b=Array(a.length),c=0,d;c<a.length;c++)d=a[c],b[c]={key:d,doc:this.store[d]};return b}q.contain=function(a){return!!this.register[a]};q.get=function(a){return this.store[a]};q.set=function(a,b){this.store[a]=b;return this};q.searchCache=R;q.addAsync=J;
+q.appendAsync=L;q.searchAsync=M;q.updateAsync=N;q.removeAsync=O;window.FlexSearch={Index:S,Document:W,registerCharset:function(a,b){G[a]=b},registerLanguage:function(a,b){F[a]=b}};}).call(this);

doc/0.7.0.md

@@ -19,6 +19,25 @@ In a document every index can have its own configuration, except the `encoder`.
 
 You can use an instance of Index directly (very much like the old FlexSearch when not indexing documents, instead just ID and text contents).
 
+### Basic Usage
+
+Load the library via the ES6 module system:
+
+```js
+import Index from "./index.js";
+import Document from "./document.js";
+
+var index = new Index(options);
+var document = new Document(options);
+```
+
+Or load one of the builds from the folder `dist` to your html as a script and use as follows:
+
+```js
+var index = new FlexSearch.Index(options);
+var document = new FlexSearch.Document(options);
+```
+
 The method signature stays almost unchanged:
 
 ```js
@@ -463,7 +482,7 @@ You need to follow 2 rules for your documents:
 
 ```js
 {
-  "records": [ // <-- not allowed when id lives inside!
+  "records": [ // <-- not allowed when ID or tag lives inside!
     {
       "id": 0,
       "title": "title"
@@ -529,7 +548,7 @@ This example breaks both rules from above:
 [ // <-- not allowed as document start!
   {
     "tag": "cat",
-    "records": [ // <-- not allowed when id lives inside!
+    "records": [ // <-- not allowed when ID or tag lives inside!
       {
         "id": 0,
         "body": {
@@ -577,8 +596,8 @@ function add(sequential_data){
             record = data.records[y];
 
             index.add({
-                tag: data.tag,
                 id: record.id,
+                tag: data.tag,
                 record: record
             });
         }
@@ -725,7 +744,7 @@ Ok, but why? These change is basically based on "boolean search". Instead of app
 
 > A field search will apply a query with the boolean "or" logic by default. Each field has its own result to the given query.
 
-There is only one situation where the `bool` property is still supported. When you like to switch the default "or" logic from the field search into "and", e.g.:
+There is one situation where the `bool` property is still supported. When you like to switch the default "or" logic from the field search into "and", e.g.:
 
 ```js
 index.search(query, { 
@@ -754,7 +773,103 @@ index.search({
         }
     }
 });
-``` 
+```
+
+### Tags
+
+Like the `key` for the ID just define the path to the tag:
+
+```js
+const index = new Document({ 
+    key: "id",
+    tag: "tag",
+    doc: "content"
+});
+```
+
+```js
+index.add({
+    id: 0,
+    tag: "cat",
+    content: "Some content ..."
+},{
+    id: 1,
+    tag: "dog",
+    content: "Some content ..."
+});
+```
+
+Your data also can have multiple tags as an array:
+
+```js
+index.add({
+    id: 0,
+    tag: ["animal", "cat"],
+    content: "Some content ..."
+},{
+    id: 1,
+    tag: ["animal", "dog"],
+    content: "Some content ..."
+});
+```
+
+You can perform a tag-specific search by:
+
+```js
+index.search(query, { 
+    field: "content",
+    tag: "animal" 
+});
+```
+
+This just gives you result which was tagged with the given tag.
+
+Use multiple tags when searching:
+
+```js
+index.search(query, { 
+    field: "content",
+    tag: ["cat", "dog"]
+});
+```
+
+This gives you result which are tagged with one of the given tag.
+
+> Multiple tags will apply as the boolean "or" by default. It just needs one of the tags to be existing.
+
+This is another situation where the `bool` property is still supported. When you like to switch the default "or" logic from the tag search into "and", e.g.:
+
+```js
+index.search(query, { 
+    field: "content",
+    tag: ["dog", "animal"],
+    bool: "and"
+});
+```
+
+You will just get results which contains both tags (in this example there is just one records which has the tag "dog" and "animal").
+
+### Tag Search
+
+You can also fetch results from one or more tags when no query was passed:
+
+```js
+index.search({ tag: ["cat", "dog"] });
+```
+
+In this case the result-set looks like:
+
+```js
+[{
+    tag: "cat",
+    result: [ /* all cats */ ]
+},{
+    tag: "dog",
+    result: [ /* all dogs */ ]
+}]
+```
+
+> By default, every query is limited to 100 entries. Unbounded queries leads into issues. You need to set the limit as an option to adjust the size.
 
 ## Document Stores
 
@@ -1355,6 +1470,22 @@ FlexSearch provides you many parameters you can use to adjust the optimal balanc
         <td>0</td>
     </tr>
     <tr></tr>
+    <tr>
+        <td>document index</td>
+        <td>+3 (per field)</td>
+        <td>-1 (per field)</td>
+        <td>0</td>
+        <td>0</td>
+    </tr>
+    <tr></tr>
+    <tr>
+        <td>document tags</td>
+        <td>+1 (per tag)</td>
+        <td>-1 (per tag)</td>
+        <td>0</td>
+        <td>0</td>
+    </tr>
+    <tr></tr>
     <tr>
         <td>store: true</td>
         <td>+5 (per document)</td>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "flexsearch",
-  "version": "0.7.0",
+  "version": "0.7.0-pre-alpha",
   "description": "Next-Generation full text search library with zero dependencies.",
   "homepage": "https://github.com/nextapps-de/flexsearch/",
   "author": "Thomas Wilkerling",

src/config.js

@@ -2,10 +2,7 @@
 export const RELEASE = "browser";
 
 /** @define {boolean} */
-export const DEBUG = true;
+export const DEBUG = false;
-
-/** @define {boolean} */
-export const PROFILER = false;
 
 /** @define {boolean} */
 export const POLYFILL = true;
@@ -28,26 +25,20 @@ export const SUPPORT_ASYNC = true;
 /** @define {boolean} */
 export const SUPPORT_PRESET = true;
 
+/** @define {boolean} */
+export const SUPPORT_STORE = true;
+
+/** @define {boolean} */
+export const SUPPORT_TAGS = true;
+
 /** @define {boolean} */
 export const SUPPORT_SUGGESTION = true;
 
 /** @define {boolean} */
 export const SUPPORT_SERIALIZE = true;
 
-/** @define {boolean} */
-export const SUPPORT_INFO = true;
-
 /** @define {boolean} */
 export const SUPPORT_DOCUMENT = true;
 
-/** @define {boolean} */
-export const SUPPORT_WHERE = true;
-
 /** @define {boolean} */
 export const SUPPORT_PAGINATION = true;
-
-/** @define {boolean} */
-export const SUPPORT_OPERATOR = true;
-
-/** @define {boolean} */
-export const SUPPORT_CALLBACK = true;

src/config/bundle.js

@@ -0,0 +1,44 @@
+/** @define {string}  */
+export const RELEASE = "browser";
+
+/** @define {boolean} */
+export const DEBUG = false;
+
+/** @define {boolean} */
+export const POLYFILL = true;
+
+/** @define {boolean} */
+export const SUPPORT_WORKER = true;
+
+/** @define {boolean|string} */
+export const SUPPORT_ENCODER = true;
+
+/** @define {boolean|string} */
+export const SUPPORT_LANG = true;
+
+/** @define {boolean} */
+export const SUPPORT_CACHE = true;
+
+/** @define {boolean} */
+export const SUPPORT_ASYNC = true;
+
+/** @define {boolean} */
+export const SUPPORT_PRESET = true;
+
+/** @define {boolean} */
+export const SUPPORT_STORE = true;
+
+/** @define {boolean} */
+export const SUPPORT_TAGS = true;
+
+/** @define {boolean} */
+export const SUPPORT_SUGGESTION = true;
+
+/** @define {boolean} */
+export const SUPPORT_SERIALIZE = true;
+
+/** @define {boolean} */
+export const SUPPORT_DOCUMENT = true;
+
+/** @define {boolean} */
+export const SUPPORT_PAGINATION = true;

src/config/compact.js

@@ -0,0 +1,44 @@
+/** @define {string}  */
+export const RELEASE = "browser";
+
+/** @define {boolean} */
+export const DEBUG = false;
+
+/** @define {boolean} */
+export const POLYFILL = false;
+
+/** @define {boolean} */
+export const SUPPORT_WORKER = false;
+
+/** @define {boolean|string} */
+export const SUPPORT_ENCODER = true;
+
+/** @define {boolean|string} */
+export const SUPPORT_LANG = false;
+
+/** @define {boolean} */
+export const SUPPORT_CACHE = false;
+
+/** @define {boolean} */
+export const SUPPORT_ASYNC = true;
+
+/** @define {boolean} */
+export const SUPPORT_PRESET = true;
+
+/** @define {boolean} */
+export const SUPPORT_STORE = true;
+
+/** @define {boolean} */
+export const SUPPORT_TAGS = false;
+
+/** @define {boolean} */
+export const SUPPORT_SUGGESTION = true;
+
+/** @define {boolean} */
+export const SUPPORT_SERIALIZE = false;
+
+/** @define {boolean} */
+export const SUPPORT_DOCUMENT = true;
+
+/** @define {boolean} */
+export const SUPPORT_PAGINATION = false;

src/config/light.js

@@ -0,0 +1,44 @@
+/** @define {string}  */
+export const RELEASE = "browser";
+
+/** @define {boolean} */
+export const DEBUG = false;
+
+/** @define {boolean} */
+export const POLYFILL = false;
+
+/** @define {boolean} */
+export const SUPPORT_WORKER = false;
+
+/** @define {boolean|string} */
+export const SUPPORT_ENCODER = false;
+
+/** @define {boolean|string} */
+export const SUPPORT_LANG = false;
+
+/** @define {boolean} */
+export const SUPPORT_CACHE = false;
+
+/** @define {boolean} */
+export const SUPPORT_ASYNC = false;
+
+/** @define {boolean} */
+export const SUPPORT_PRESET = false;
+
+/** @define {boolean} */
+export const SUPPORT_STORE = false;
+
+/** @define {boolean} */
+export const SUPPORT_TAGS = false;
+
+/** @define {boolean} */
+export const SUPPORT_SUGGESTION = false;
+
+/** @define {boolean} */
+export const SUPPORT_SERIALIZE = false;
+
+/** @define {boolean} */
+export const SUPPORT_DOCUMENT = false;
+
+/** @define {boolean} */
+export const SUPPORT_PAGINATION = false;

src/document.js

@@ -6,11 +6,12 @@
  * https://github.com/nextapps-de/flexsearch
  */
 
-import { SUPPORT_ASYNC, SUPPORT_CACHE } from "./config.js";
+import { SUPPORT_ASYNC, SUPPORT_CACHE, SUPPORT_STORE, SUPPORT_TAGS } from "./config.js";
-import { create_object } from "./common.js";
 import Index from "./index.js";
-import { addAsync, appendAsync, removeAsync, searchAsync, updateAsync } from "./async.js";
 import Cache, { searchCache } from "./cache.js";
+import { create_object } from "./common.js";
+import { addAsync, appendAsync, removeAsync, searchAsync, updateAsync } from "./async.js";
+import { intersect, intersect_union } from "./intersect.js";
 
 /**
  * @param {Object=} options
@@ -29,13 +30,24 @@ function Document(options){
 
     options || (options = {});
 
-    this.register = create_object();
-    this.store = (opt = options["store"]) && create_object();
-    this.storetree = opt && (opt !== true) && [];
-    this.markup = [];
-    this.key = ((opt = options["key"]) && parse_tree(opt, this.markup)) || "id";
     this.tree = [];
     this.field = [];
+    this.marker = [];
+    this.register = create_object();
+    this.key = ((opt = options["key"]) && parse_tree(opt, this.marker)) || "id";
+    this.fastupdate = parse_option(options["fastupdate"], true);
+
+    if(SUPPORT_STORE){
+
+        this.store = (opt = options["store"]) && create_object();
+        this.storetree = opt && (opt !== true) && [];
+    }
+
+    if(SUPPORT_TAGS){
+
+        this.tag = ((opt = options["tag"]) && parse_tree(opt, this.marker));
+        this.tagindex = opt && create_object();
+    }
 
     if(SUPPORT_CACHE){
 
@@ -49,6 +61,11 @@ function Document(options){
 
 export default Document;
 
+function parse_option(value, default_value){
+
+    return typeof value !== "undefined" ? value : default_value;
+}
+
 /**
  * @this Document
  */
@@ -84,11 +101,11 @@ function parse_descriptor(options){
         }
 
         index[key] = new Index(item, this.register);
-        this.tree[i] = parse_tree(key, this.markup);
+        this.tree[i] = parse_tree(key, this.marker);
         this.field[i] = key;
     }
 
-    if(this.storetree){
+    if(SUPPORT_STORE && this.storetree){
 
         let store = options["store"];
 
@@ -99,14 +116,14 @@ function parse_descriptor(options){
 
         for(let i = 0; i < store.length; i++){
 
-            this.storetree[i] = parse_tree(store[i], this.markup);
+            this.storetree[i] = parse_tree(store[i], this.marker);
         }
     }
 
     return index;
 }
 
-function parse_tree(key, markup){
+function parse_tree(key, marker){
 
     const tree = key.split(":");
     let count = 0;
@@ -121,7 +138,7 @@ function parse_tree(key, markup){
 
             if(key){
 
-                markup[count] = true;
+                marker[count] = true;
             }
         }
 
@@ -139,7 +156,7 @@ function parse_tree(key, markup){
     return count > 1 ? tree : tree[0];
 }
 
-function get_id(obj, tree){
+function parse_simple(obj, tree){
 
     if(typeof tree === "string"){
 
@@ -190,7 +207,7 @@ function store_value(obj, store, tree, pos, key){
     }
 }
 
-function add_index(obj, tree, markup, pos, index, id, key, _append){
+function add_index(obj, tree, marker, pos, index, id, key, _append){
 
     obj = obj[key];
 
@@ -202,7 +219,7 @@ function add_index(obj, tree, markup, pos, index, id, key, _append){
 
         if(obj.constructor === Array){
 
-            if(markup[pos]){
+            if(marker[pos]){
 
                 for(let i = 0; i < obj.length; i++){
 
@@ -224,14 +241,14 @@ function add_index(obj, tree, markup, pos, index, id, key, _append){
             for(let i = 0; i < obj.length; i++){
 
                 // do not increase index, an array is not a field
-                add_index(obj, tree, markup, pos, index, id, i, _append);
+                add_index(obj, tree, marker, pos, index, id, i, _append);
             }
         }
         else{
 
             key = tree[++pos];
 
-            add_index(obj, tree, markup, pos, index, id, key, _append);
+            add_index(obj, tree, marker, pos, index, id, key, _append);
         }
     }
 }
@@ -249,7 +266,7 @@ Document.prototype.add = function(id, content, _append){
     if(typeof id === "object"){
 
         content = id;
-        id = get_id(content, this.key);
+        id = parse_simple(content, this.key);
     }
 
     if(content && (id || (id === 0))){
@@ -269,10 +286,45 @@ Document.prototype.add = function(id, content, _append){
                 tree = [tree];
             }
 
-            add_index(content, tree, this.markup, 0, this.index[field], id, tree[0], _append);
+            add_index(content, tree, this.marker, 0, this.index[field], id, tree[0], _append);
         }
 
-        if(this.store){
+        if(SUPPORT_TAGS && this.tag){
+
+            let tag = parse_simple(content, this.tag);
+            let dupes = create_object();
+
+            if(typeof tag === "string"){
+
+                tag = [tag];
+            }
+
+            for(let i = 0, key, arr; i < tag.length; i++){
+
+                key = tag[i];
+
+                if(!dupes[key]){
+
+                    dupes[key] = 1;
+                    arr = this.tagindex[key] || (this.tagindex[key] = []);
+
+                    if(!_append || (arr.indexOf(id) === -1)){
+
+                        arr[arr.length] = id;
+
+                        // add a reference to the register for fast updates
+
+                        if(this.fastupdate){
+
+                            const tmp = this.register[id] || (this.register[id] = []);
+                            tmp[tmp.length] = arr;
+                        }
+                    }
+                }
+            }
+        }
+
+        if(SUPPORT_STORE && this.store){
 
             let store;
 
@@ -297,6 +349,7 @@ Document.prototype.add = function(id, content, _append){
 
             this.store[id] = store || content;
         }
+
     }
 
     return this;
@@ -326,7 +379,33 @@ Document.prototype.remove = function(id){
             this.index[this.field[i]].remove(id, true);
         }
 
-        if(this.store){
+        if(SUPPORT_TAGS && this.tag){
+
+            // when fastupdate was enabled the id will be already cleanup by the index
+
+            if(!this.fastupdate){
+
+                for(let key in this.tagindex){
+
+                    const tag = this.tagindex[key];
+                    const pos = tag.indexOf(id);
+
+                    if(pos !== -1){
+
+                        if(tag.length > 1){
+
+                            tag.splice(pos, 1);
+                        }
+                        else{
+
+                            delete this.tagindex[key];
+                        }
+                    }
+                }
+            }
+        }
+
+        if(SUPPORT_STORE && this.store){
 
             delete this.store[id];
         }
@@ -351,75 +430,145 @@ Document.prototype.search = function(query, limit, options){
 
     let result = [];
     let pluck, enrich;
-    let field, field_options, bool, count = 0;
+    let field, field_options, tag, bool, count = 0;
 
     if(options){
 
         pluck = options["pluck"];
         field = pluck || options["field"];
-        enrich = options["enrich"];
+        tag = SUPPORT_TAGS && options["tag"];
+        enrich = SUPPORT_STORE && this.store && options["enrich"];
         bool = options["bool"] === "and";
         limit = options["limit"];
-    }
 
-    if(field){
+        if(field){
 
-        if(typeof field === "string"){
+            if(typeof field === "string"){
 
-            field = [field];
+                field = [field];
+            }
+            else if(field.constructor !== Array){
+
+                field_options = field;
+                field = Object.keys(field);
+            }
         }
-        else if(field.constructor !== Array){
 
-            field_options = field;
+        if(tag){
-            field = Object.keys(field);
+
+            if(typeof tag === "string"){
+
+                tag = [tag];
+            }
+
+            // when tags is used and no query was set,
+            // then just return the tag indexes
+
+            if(!query){
+
+                for(let i = 0, res; i < tag.length; i++){
+
+                    res = get_tag.call(this, tag[i], limit || 100, enrich);
+
+                    if(res){
+
+                        result[result.length] = res;
+                        count++;
+                    }
+                }
+
+                return count ? result : [];
+            }
         }
     }
-    else{
 
-        field = this.field;
+    field || (field = this.field);
-    }
+    bool = bool && ((field.length > 1) || (tag && (tag.length > 1)));
 
-    bool = bool && (field.length > 1);
+    let found_tag = [];
 
-    for(let i = 0, res, key, item; i < field.length; i++){
+    // TODO solve this in one loop below
+
+    for(let i = 0, res, key, item, len; i < field.length; i++){
 
         key = field[i];
 
-        if(field_options){
+        // if(field_options){
+        //
+        //     item = field_options[key];
+        //
+        //     // inherit options also when search? it is just for laziness, Object.assign() has a cost
+        //     //item = typeof item === "object" ? Object.assign({}, options, item) : options;
+        // }
+        // else{
+        //
+        //     item = options;
+        // }
 
-            item = field_options[key];
+        res = this.index[key].search(query, limit, field_options ? field_options[key] : options);
+        len = res.length;
 
-            // inherit options?
+        if(tag && len){
-            //item = typeof item === "object" ? Object.assign({}, options, item) : options;
-        }
-        else{
 
-            item = options;
+            const field_tag = found_tag[i] = [];
+            const arr = [];
+            let count = 0;
+
+            if(bool){
+
+                // prepare for intersection
+
+                arr[0] = [res];
+            }
+
+            for(let y = 0, key, res; y < tag.length; y++){
+
+                key = tag[y];
+                res = this.tagindex[key];
+                len = res && res.length;
+
+                if(len){
+
+                    arr[arr.length] = bool ? [res] : res;
+                    field_tag[count++] = key;
+                }
+            }
+
+            if(count){
+
+                if(bool){
+
+                    res = intersect(arr, limit || 100);
+                }
+                else{
+
+                    res = intersect_union(res, arr);
+                }
+
+                len = res.length;
+            }
         }
 
-        res = this.index[key].search(query, limit, item);
+        if(len){
 
-        if(bool){
+            result[count++] = res;
+        }
+        else if(bool){
 
-            if(!res.length){
+            //if(!len){
-
-                // fast path optimization
 
                 return [];
-            }
+            //}
 
             // add a pseudo relevance index for the intersection
             // used when squash the results on boolean "and"
             //res = [res];
         }
-
-        count += res.length;
-        result[i] = res;
     }
 
     if(!count){
 
-        // fast path optimization
+        // fast path "not found"
 
         return [];
     }
@@ -450,9 +599,12 @@ Document.prototype.search = function(query, limit, options){
         key = field[i];
         res = result[i];
 
-        if(enrich && this.store){
+        if(res.length){
 
-            res = apply_enrich.call(this, res);
+            if(enrich){
+
+                res = apply_enrich.call(this, res);
+            }
         }
 
         if(pluck){
@@ -460,16 +612,50 @@ Document.prototype.search = function(query, limit, options){
             return res;
         }
 
-        result[i] = {
+        result[i] = res = {
 
             "field": key,
             "result": res
         };
+
+        if(tag){
+
+            res["tag"] = found_tag[i];
+        }
     }
 
     return result;
 };
 
+/**
+ * @this Document
+ */
+
+function get_tag(key, limit, enrich){
+
+    let res = this.tagindex[key];
+    let len = res && res.length;
+
+    if(len){
+
+        if(len > limit){
+
+            res = res.slice(0, limit);
+        }
+
+        if(enrich){
+
+            res = apply_enrich.call(this, res);
+        }
+
+        return {
+
+            "tag": key,
+            "result": res
+        };
+    }
+}
+
 /**
  * @this Document
  */
@@ -492,22 +678,25 @@ function apply_enrich(res){
     return arr;
 }
 
-Document.prototype.get = function(id){
-
-    return this.store[id];
-};
-
-Document.prototype.set = function(id, data){
-
-    this.store[id] = data;
-    return this;
-};
-
 Document.prototype.contain = function(id){
 
     return !!this.register[id];
 };
 
+if(SUPPORT_STORE){
+
+    Document.prototype.get = function(id){
+
+        return this.store[id];
+    };
+
+    Document.prototype.set = function(id, data){
+
+        this.store[id] = data;
+        return this;
+    };
+}
+
 if(SUPPORT_CACHE){
 
     Document.prototype.searchCache = searchCache;

src/index.js

@@ -6,15 +6,15 @@
  * https://github.com/nextapps-de/flexsearch
  */
 
-import { SUPPORT_PRESET, SUPPORT_CACHE, SUPPORT_ASYNC, SUPPORT_WORKER } from "./config.js";
+import { SUPPORT_PRESET, SUPPORT_CACHE, SUPPORT_ASYNC, SUPPORT_WORKER, SUPPORT_SUGGESTION } from "./config.js";
 import { encode as default_encoder } from "./lang/latin/default.js";
 import { create_object, create_object_array, concat, sort_by_length_down } from "./common.js";
 import { pipeline, init_stemmer_or_matcher, init_filter } from "./lang.js";
 import { global_lang, global_charset } from "./global.js";
 import { addAsync, appendAsync, removeAsync, searchAsync, updateAsync } from "./async.js";
+import { intersect } from "./intersect.js";
 import Cache, { searchCache } from "./cache.js";
 import apply_preset from "./presets.js";
-import intersect from "./intersect.js";
 
 /**
  * @param {Object=} options
@@ -349,16 +349,8 @@ Index.prototype.push_index = function(dupes, value, score, id, append, keyword){
 
             if(this.fastupdate){
 
-                const tmp = this.register[id];
+                const tmp =  this.register[id] || (this.register[id] = []);
-
+                tmp[tmp.length] = arr;
-                if(tmp){
-
-                    tmp[tmp.length] = arr;
-                }
-                else{
-
-                    this.register[id] = [arr];
-                }
             }
         }
     }
@@ -392,7 +384,7 @@ Index.prototype.search = function(query, limit, options){
         limit = options["limit"];
         threshold = parse_option(options["threshold"], threshold);
         context = options["context"];
-        suggest = options["suggest"];
+        suggest = SUPPORT_SUGGESTION && options["suggest"];
     }
 
     if(query){
@@ -569,18 +561,6 @@ Index.prototype.add_result = function(result, suggest, resolution, limit, just_o
     if(!this.optimize){
 
         arr = get_array(arr, term, keyword, this.bidirectional);
-
-        // if(keyword){
-        //
-        //     const swap = this.bidirectional && (term > keyword);
-        //
-        //     arr = arr[swap ? term : keyword];
-        //     arr = arr && arr[swap ? keyword : term];
-        // }
-        // else{
-        //
-        //     arr = arr[term];
-        // }
     }
 
     if(arr){
@@ -595,18 +575,6 @@ Index.prototype.add_result = function(result, suggest, resolution, limit, just_o
             if(this.optimize){
 
                 tmp = get_array(tmp, term, keyword, this.bidirectional);
-
-                // if(keyword){
-                //
-                //     const swap = this.bidirectional && (term > keyword);
-                //
-                //     tmp = tmp[swap ? term : keyword];
-                //     tmp = tmp && tmp[swap ? keyword : term];
-                // }
-                // else{
-                //
-                //     tmp = tmp[term];
-                // }
             }
 
             if(tmp){
@@ -682,7 +650,7 @@ Index.prototype.remove = function(id, _skip_deletion){
 
         if(this.fastupdate){
 
-            // fast updates performs really fast but did not cleanup the key entries
+            // fast updates performs really fast but did not fully cleanup the key entries
 
             for(let i = 0, tmp; i < refs.length; i++){
 

src/intersect.js

@@ -7,7 +7,7 @@ import { create_object, concat } from "./common.js";
  * @returns {Array}
  */
 
-export default function(arrays, limit, suggest) {
+export function intersect(arrays, limit, suggest) {
 
     const length = arrays.length;
     let result = [];
@@ -135,3 +135,42 @@ export default function(arrays, limit, suggest) {
 
     return result;
 }
+
+/**
+ * @param mandatory
+ * @param arrays
+ * @returns {Array}
+ */
+
+export function intersect_union(mandatory, arrays) {
+
+    const check = create_object();
+    const union = create_object();
+    const result = [];
+
+    for(let x = 0; x < mandatory.length; x++){
+
+        check[mandatory[x]] = 1;
+    }
+
+    for(let x = 0, arr; x <  arrays.length; x++){
+
+        arr = arrays[x];
+
+        for(let y = 0, id; y < arr.length; y++){
+
+            id = arr[y];
+
+            if(check[id]){
+
+                if(!union[id]){
+
+                    union[id] = 1;
+                    result[result.length] = id;
+                }
+            }
+        }
+    }
+
+    return result;
+}