Update docs

Signed-off-by: Jack Cherng <jfcherng@gmail.com>

Author: jfcherng

README.md

@@ -75,6 +75,7 @@ $rendererName = 'Unified';
 // the Diff class options
 $differOptions = [
     // show how many neighbor lines
+    // Differ::CONTEXT_ALL can be used to show the whole file
     'context' => 3,
     // ignore case difference
     'ignoreCase' => false,

example/demo.php

@@ -2,6 +2,7 @@
 
 include __DIR__ . '/../vendor/autoload.php';
 
+use Jfcherng\Diff\Differ;
 use Jfcherng\Diff\DiffHelper;
 use Jfcherng\Diff\Factory\RendererFactory;
 
@@ -25,6 +26,7 @@
         // options for Diff class
         $diffOptions = [
             // show how many neighbor lines
+            // Differ::CONTEXT_ALL can be used to show the whole file
             'context' => 1,
             // ignore case difference
             'ignoreCase' => false,

src/Differ.php

@@ -15,8 +15,8 @@
  */
 final class Differ
 {
-    // a safe number for indicating showing all contexts
-    const CONTEXT_ALL = \PHP_INT_MAX >> 4;
+    /** @var int a safe number for indicating showing all contexts */
+    const CONTEXT_ALL = \PHP_INT_MAX >> 3;
 
     /**
      * @var array cached properties and their default values
@@ -32,12 +32,12 @@ final class Differ
     public $options = [];
 
     /**
-     * @var string[] the "old" sequence to use as the basis for the comparison
+     * @var string[] the old sequence
      */
     private $old = [];
 
     /**
-     * @var string[] the "new" sequence to generate the changes for
+     * @var string[] the new sequence
      */
     private $new = [];
 
@@ -67,6 +67,7 @@ final class Differ
      */
     private static $defaultOptions = [
         // show how many neighbor lines
+        // Differ::CONTEXT_ALL can be used to show the whole file
         'context' => 3,
         // ignore case difference
         'ignoreWhitespace' => false,