PHP and Javascript solutions to moderate challenges #76 - String Rotation

Author: pascal-bourut

moderate/76 - String Rotation/76.js

@@ -0,0 +1,22 @@
+// https://www.codeeval.com/open_challenges/76/
+var fs = require("fs");
+fs.readFileSync(process.argv[2]).toString().split('\n').forEach(function (line) {
+    line = line.trim();
+    if( line !== '' ){
+        var tmp = line.split(',');
+        var a = tmp[0];
+        var b = tmp[1];
+        
+        var offset = 0;
+        var ok = false;
+        while( -1 !== ( pos = b.indexOf(a[0], offset) ) ){
+            var start = b.substr( pos );
+            var end = b.substr(0, pos);
+            if( a == start+end ){
+                ok = true;
+            }
+            offset = pos + 1;
+        }//
+        console.log( ok ? 'True' : 'False');
+    }
+});

moderate/76 - String Rotation/76.php

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+<?php
+header('Content-Type: text/plain; charset=utf-8');
+
+// https://www.codeeval.com/open_challenges/76/
+
+if( isset($_GET['f_i_l_e']) && $_GET['f_i_l_e'] ) $argv[1] = $_GET['f_i_l_e'];
+
+if( isset($argv[1]) && $argv[1] ){
+    $filename = $argv[1];
+    if( file_exists($filename) ){
+        if( is_readable($filename) ){
+            $fp = fopen($filename, 'r');
+            if( $fp ){
+                while ( $fp && !feof( $fp ) ) {
+                    $line = trim(fgets($fp));
+                    if( $line ){
+                        list($a, $b) = explode(',', $line);
+                        $offset = 0;
+                        $ok = false;
+                        while( false !== ( $pos = strpos($b, $a[0], $offset) ) ){
+                            $start = substr($b, $pos);
+                            $end = substr($b, 0, $pos);
+                            if( $a == $start.$end ){
+                                $ok = true;
+                            }
+                            $offset = $pos + 1;
+                        }//
+                        echo ($ok ? 'True' : 'False') . "\n";
+                    }
+                    
+                }//
+                fclose( $fp );
+            }
+            else{
+                echo '!fp'."\n";
+            }
+        }
+        else{
+            echo '!readable'."\n";
+        }
+    }
+    else{
+        echo '!file_exists'."\n";
+    }
+}
+else{
+    echo '!argv[1]'."\n";
+}
+
+exit(0);
+
+?>

moderate/76 - String Rotation/test.txt

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+M8TszRYeARzZF9GBCVrI5MnR,YeARzZF9GBCVrI5MnRM8TszR
+Hello,lloHe
+Basefont,tBasefon
+MQi4oZvNEUmccgE2EA27ZpCvVWDJ,EUmccgE2EA27ZpCvVWDJMQi4oZvN
+8J8qrQ6sd3Hvzmgv4P0LMZ,qrQ6sd3Hvzmgv4P0LMZ8J8
+Acquisitions,isitionsAcqu
+7gNHLdpHmmAqPc6WFu7s5x,xgNHLdpHmmAqPc6WFu7s57
+JqDT4crse0yeyXiEPmmZrHI9FxRu P,PqDT4crse0yeyXiEPmmZrHI9FxRu J
+n8USuLgHAd8CKMgnHiYJSfi8J,i8Jn8USuLgHAd8CKMgnHiYJSf
+Hello,lloHe
+BusNpxbk7DxpMGNN6u1HOCm,musNpxbk7DxpMGNN6u1HOCB
+Trial,alrTi
+KSLP2b81bGd07ozNgMBci,ozNgMBciKSLP2b81bGd07
+v7UBoHz8ta26jl1Zgf5uJ,J7UBoHz8ta26jl1Zgf5uv
+OUoYsqUIXPQQp017 DeHfK,KUoYsqUIXPQQp017 DeHfO
+BSWoTNATfNmkfoZbX3G3,X3G3BSWoTNATfNmkfoZb
+d7B5nAKsKmQzxwl2LIwN1R,R7B5nAKsKmQzxwl2LIwN1d
+JgLhUYsXAS5YykVY2rt6Vjc,Y2rt6VjcJgLhUYsXAS5YykV
+Basefont,tBasefon
+Permute,mutePer
+EaGMsw40rQZKXZtSxDEmQ4rIzhx 1,1aGMsw40rQZKXZtSxDEmQ4rIzhx E
+PmG4j jm3BPQ7HpJpFNh,pJpFNhPmG4j jm3BPQ7H