add configurable order function for Alphabetical Use Statement Sniff, fixes #5

MO4/Sniffs/Formatting/AlphabeticalUseStatementsSniff.php

@@ -16,26 +16,55 @@
 /**
  * Alphabetical Use Statements sniff.
  *
- * Use statements must be in alphabetical order, grouped by empty lines
+ * Use statements must be in alphabetical order, grouped by empty lines.
  *
  * @category  PHP
  * @package   PHP_CodeSniffer-MO4
  * @author    Xaver Loppenstedt <xaver@loppenstedt.de>
  * @author    Steffen Ritter <steffenritter1@gmail.com>
  * @author    Christian Albrecht <christian.albrecht@mayflower.de>
- * @copyright 2013-2014 Xaver Loppenstedt, some rights reserved.
+ * @copyright 2013-2017 Xaver Loppenstedt, some rights reserved.
  * @license   http://spdx.org/licenses/MIT MIT License
  * @link      https://github.com/Mayflower/mo4-coding-standard
  */
 
 namespace MO4\Sniffs\Formatting;
 
+use PHP_CodeSniffer\Exceptions\RuntimeException;
 use PHP_CodeSniffer\Files\File;
 use PHP_CodeSniffer\Standards\PSR2\Sniffs\Namespaces\UseDeclarationSniff;
+use PHP_CodeSniffer\Util\Common;
 use PHP_CodeSniffer\Util\Tokens as PHP_CodeSniffer_Tokens;
 
 class AlphabeticalUseStatementsSniff extends UseDeclarationSniff
 {
+
+    const NAMESPACE_SEPRATOR_STRING = '\\';
+
+    /**
+     * Sorting order, can be one of:
+     *   'dictionary', 'string', 'string-locale' or 'string-case-insensitive'
+     *
+     * Unknown types will be mapped to 'string'.
+     *
+     * @var string
+     */
+    public $order = 'dictionary';
+
+
+    /**
+     * Supported ordering methods
+     *
+     * @var array
+     */
+    private $supportedOrderingMethods = [
+                                         'dictionary',
+                                         'string',
+                                         'string',
+                                         'string-locale',
+                                         'string-case-insensitive',
+                                        ];
+
     /**
      * Last import seen in group
      *
@@ -58,6 +87,30 @@ class AlphabeticalUseStatementsSniff extends UseDeclarationSniff
     private $currentFile = null;
 
 
+    /**
+     * Returns an array of tokens this test wants to listen for.
+     *
+     * @return array
+     * @throws \PHP_CodeSniffer\Exceptions\RuntimeException
+     */
+    public function register()
+    {
+        if (in_array($this->order, $this->supportedOrderingMethods) === false) {
+            $error = sprintf(
+                "'%s' is not a valid order function for %s! Pick one of: %s",
+                $this->order,
+                Common::getSniffCode(__CLASS__),
+                implode(', ', $this->supportedOrderingMethods)
+            );
+
+            throw new RuntimeException($error);
+        }
+
+        return parent::register();
+
+    }//end register()
+
+
     /**
      * Processes this test, when one of its tokens is encountered.
      *
@@ -99,11 +152,11 @@ public function process(File $phpcsFile, $stackPtr)
 
         $fixable = false;
         if ($this->lastImport !== ''
-            && strcmp($this->lastImport, $currentImport) > 0
+            && $this->compareString($this->lastImport, $currentImport) > 0
         ) {
-            $msg     = 'USE statements must be sorted alphabetically';
+            $msg     = 'USE statements must be sorted alphabetically, order %s';
             $code    = 'MustBeSortedAlphabetically';
-            $fixable = $phpcsFile->addFixableError($msg, $currentPtr, $code);
+            $fixable = $phpcsFile->addFixableError($msg, $currentPtr, $code, [$this->order]);
         }
 
         if (true === $fixable) {
@@ -280,12 +333,82 @@ private function findNewDestination(
             $prevLine      = $tokens[$prevPtr]['line'];
             $prevImportArr = $this->getUseImport($phpcsFile, $prevPtr);
         } while ($prevLine === ($line - 1)
-            && (strcmp($prevImportArr['content'], $import) > 0)
+            && ($this->compareString($prevImportArr['content'], $import) > 0)
         );
 
         return $ptr;
 
     }//end findNewDestination()
 
 
+    /**
+     * Compare namespace strings according defined order function.
+     *
+     * @param string $a first namespace string
+     * @param string $b second namespace string
+     *
+     * @return int
+     */
+    private function compareString($a, $b)
+    {
+        if ('dictionary' === $this->order) {
+            return $this->dictionaryCompare($a, $b);
+        } else if ('string' === $this->order) {
+            return strcmp($a, $b);
+        } else if ('string-locale' === $this->order) {
+            return strcoll($a, $b);
+        } else if ('string-case-insensitive' === $this->order) {
+            return strcasecmp($a, $b);
+        } else {
+            return $this->dictionaryCompare($a, $b);
+        }
+
+    }//end compareString()
+
+
+    /**
+     * Lexicographical namespace string compare.
+     *
+     * Example:
+     *
+     *   use Doctrine\ORM\Query;
+     *   use Doctrine\ORM\Query\Expr;
+     *   use Doctrine\ORM\QueryBuilder;
+     *
+     * @param string $a first namespace string
+     * @param string $b second namespace string
+     *
+     * @return int
+     */
+    private function dictionaryCompare($a, $b)
+    {
+        $min = min(strlen($a), strlen($b));
+
+        for ($i = 0; $i < $min; $i++) {
+            if ($a[$i] === $b[$i]) {
+                continue;
+            }
+
+            if ($a[$i] === self::NAMESPACE_SEPRATOR_STRING) {
+                return -1;
+            }
+
+            if ($b[$i] === self::NAMESPACE_SEPRATOR_STRING) {
+                return 1;
+            }
+
+            if ($a[$i] < $b[$i]) {
+                return -1;
+            }
+
+            if ($a[$i] > $b[$i]) {
+                return 1;
+            }
+        }//end for
+
+        return strcmp(substr($a, $min), substr($b, $min));
+
+    }//end dictionaryCompare()
+
+
 }//end class

MO4/Tests/Formatting/AlphabeticalUseStatementsUnitTest.fail.4.inc

@@ -0,0 +1,26 @@
+<?php
+
+use A1\B\C;
+use A1\B;
+use A1\BD;
+
+use A2\BD;
+use A2\B;
+use A2\B\C;
+
+use A3\B;
+use A3\BD;
+use A3\B\C;
+
+use A4\B\C;
+use A4\BD;
+use A4\B;
+
+use A5\BD;
+use A5\B\C;
+use A5\B;
+
+class Foo
+{
+
+}

MO4/Tests/Formatting/AlphabeticalUseStatementsUnitTest.fail.4.inc.fixed

@@ -0,0 +1,26 @@
+<?php
+
+use A1\B;
+use A1\B\C;
+use A1\BD;
+
+use A2\B;
+use A2\B\C;
+use A2\BD;
+
+use A3\B;
+use A3\B\C;
+use A3\BD;
+
+use A4\B;
+use A4\B\C;
+use A4\BD;
+
+use A5\B;
+use A5\B\C;
+use A5\BD;
+
+class Foo
+{
+
+}

MO4/Tests/Formatting/AlphabeticalUseStatementsUnitTest.pass.inc

@@ -12,6 +12,10 @@ use Z;
 
 use X;
 
+use A\B;
+use A\B\C;
+use A\BD;
+
 class Foo {
     $bar = 'foo';
 
@@ -25,4 +29,4 @@ class Foo {
 
     // test run away tokens
     use () {};
-}
+}

MO4/Tests/Formatting/AlphabeticalUseStatementsUnitTest.php

@@ -71,6 +71,15 @@ protected function getErrorList($testFile='')
                     10 => 1,
                     15 => 1,
                    );
+        case 'AlphabeticalUseStatementsUnitTest.fail.4.inc':
+            return array(
+                    4  => 1,
+                    8  => 1,
+                    13 => 1,
+                    17 => 1,
+                    20 => 1,
+                    21 => 1,
+                   );
         }//end switch
 
         return null;

README.md

@@ -17,13 +17,52 @@ The MO4 Coding Standard is an extension of the [Symfony Coding Standard](http://
 * in associative arrays, the `=>` operators must be aligned
 * in arrays, the key and `=>` operator must be on the same line
 * each consecutive variable assignment must align at the assignment operator
-* use statements must be sorted lexicographically
+* use statements must be sorted lexicographically, grouped by empty lines. The order function can be configured.
 * you should use the imported class name when it was imported with a use statement
 * interpolated variables in double quoted strings must be surrounded by `{ }`, e.g. `{$VAR}` instead of `$VAR`
-* `sprintf` or `"{$VAR1} {$VAR2}"` must be used instead of the dot operator; concat operators are only allowed to concatenate constants and multi line strings,
+* `sprintf` or `"{$VAR1} {$VAR2}"` must be used instead of the dot operator; concat operators are only allowed to concatenate constants and multi line strings
 * a whitespace is required after each typecast, e.g. `(int) $value` instead of `(int)$value`
 * doc blocks of class properties must be multiline and have exactly one `@var` annotation
 
+## Configuration
+
+### MO4.Formatting.AlphabeticalUseStatements
+
+The `order` property of the `MO4.Formatting.AlphabeticalUseStatements` sniff defines
+which function is used for ordering.
+
+Possible values for order:
+* `dictionary` (default): based on [strcmp](http://php.net/strcmp), the namespace separator
+  precedes any other character
+  ```php
+  use Doctrine\ORM\Query;
+  use Doctrine\ORM\Query\Expr;
+  use Doctrine\ORM\QueryBuilder;
+  ```
+* `string`: binary safe string comparison using [strcmp](http://php.net/strcmp)
+  ```php
+  use Doctrine\ORM\Query;
+  use Doctrine\ORM\QueryBuilder;
+  use Doctrine\ORM\Query\Expr;
+
+  use ExampleSub;
+  use Examples;
+  ```
+* `string-locale`: locale based string comparison using [strcoll](http://php.net/strcoll)
+* `string-case-insenstive`: binary safe case-insensitive string comparison [strcasecmp](http://php.net/strcasecmp)
+   ```php
+   use Examples;
+   use ExampleSub;
+   ```
+
+```
+<rule ref="MO4.Formatting.AlphabeticalUseStatements">
+    <properties>
+        <property name="order" value="string-locale"/>
+    </properties>
+</rule>
+```
+
 ## Installation
 
 ### Composer