From 9e6ea96aa650b69cbd7162f56f68fdb1df3b7c8f Mon Sep 17 00:00:00 2001
From: Allan Jardine <allan@datatables.net>
Date: Mon, 27 May 2019 11:08:43 +0000
Subject: [PATCH] Filtering - improved support for searching with accents

- Thanks to lledieu for pointing this out
---
 filtering/type-based/accent-neutralise.js | 59 +++++------------------
 1 file changed, 13 insertions(+), 46 deletions(-)

diff --git a/filtering/type-based/accent-neutralise.js b/filtering/type-based/accent-neutralise.js
index 806bbd9..69eb1e8 100644
--- a/filtering/type-based/accent-neutralise.js
+++ b/filtering/type-based/accent-neutralise.js
@@ -4,11 +4,9 @@
  * type based search plug-in replaces the built-in string formatter in
  * DataTables with a function that will replace the accented characters
  * with their unaccented counterparts for fast and easy filtering.
- *
- * Note that with the accented characters being replaced, a search input using
- * accented characters will no longer match. The second example below shows
- * how the function can be used to remove accents from the search input as well,
- * to mitigate this problem.
+ * 
+ * Note that this plug-in uses the Javascript I18n API that was introduced in
+ * ES6. For older browser's this plug-in will have no effect.
  *
  *  @summary Replace accented characters with unaccented counterparts
  *  @name Accent neutralise
@@ -18,54 +16,23 @@
  *    $(document).ready(function() {
  *        $('#example').dataTable();
  *    } );
- *
- *  @example
- *    $(document).ready(function() {
- *        var table = $('#example').dataTable();
- *
- *        // Remove accented character from search input as well
- *        $('#myInput').keyup( function () {
- *          table
- *            .search(
- *              jQuery.fn.DataTable.ext.type.search.string( this.value )
- *            )
- *            .draw()
- *        } );
- *    } );
  */
 
 (function(){
 
 function removeAccents ( data ) {
-    return data
-        .replace( /έ/g, 'ε' )
-        .replace( /[ύϋΰ]/g, 'υ' )
-        .replace( /ό/g, 'ο' )
-        .replace( /ώ/g, 'ω' )
-        .replace( /ά/g, 'α' )
-        .replace( /[ίϊΐ]/g, 'ι' )
-        .replace( /ή/g, 'η' )
-        .replace( /\n/g, ' ' )
-        .replace( /[ÀÁÂÃÄÅ]/g, 'A' )
-        .replace( /[àáâãäå]/g, 'a' )
-        .replace( /[ÈÉÊË]/g, 'E' )
-        .replace( /[èéêë]/g, 'e' )
-        .replace( /[ÌÍÎÏ]/g, 'i' )
-        .replace( /[ìíîï]/g, 'i' )
-        .replace( /[ÒÓÔÕÖ]/g, 'O' )
-        .replace( /[òóôõö]/g, 'o' )
-        .replace( /[ÙÚÛÜ]/g, 'U' )
-        .replace( /[ùúûü]/g, 'u' )
-        .replace( /Ñ/g, 'N' )
-        .replace( /ñ/g, 'n' )
-        .replace( /Ț/g, 'T' )
-        .replace( /ț/g, 't' )
-        .replace( /Ș/g, 'S' )
-        .replace( /ș/g, 's' )
-        .replace( /Ç/g, 'C' )
-        .replace( /ç/g, 'c' );
+    if ( data.normalize ) {
+        // Use I18n API if avaiable to split characters and accents, then remove
+        // the accents wholesale. Note that we use the original data as well as
+        // the new to allow for searching of either form.
+        return data +' '+ data
+            .normalize('NFD')
+            .replace(/[\u0300-\u036f]/g, '');
     }
 
+    return data;
+}
+
 var searchType = jQuery.fn.DataTable.ext.type.search;
 
 searchType.string = function ( data ) {