From aaf4950d4ffc6db1e9e8ce16f1a7559a94993b00 Mon Sep 17 00:00:00 2001
From: jfsimon <contact@jfsimon.fr>
Date: Tue, 10 Jul 2012 11:13:16 +0200
Subject: [PATCH] [Console] Implemented '<' escaping.

---
 .../Console/Formatter/OutputFormatter.php     | 46 ++++++++++++++-----
 1 file changed, 35 insertions(+), 11 deletions(-)

diff --git a/src/Symfony/Component/Console/Formatter/OutputFormatter.php b/src/Symfony/Component/Console/Formatter/OutputFormatter.php
index 5cfadfc3514d..2f321ae5c3eb 100644
--- a/src/Symfony/Component/Console/Formatter/OutputFormatter.php
+++ b/src/Symfony/Component/Console/Formatter/OutputFormatter.php
@@ -23,12 +23,29 @@ class OutputFormatter implements OutputFormatterInterface
     /**
      * The pattern to phrase the format.
      */
-    const FORMAT_PATTERN = '#<(/?)([a-z][a-z0-9_=;-]+)?>([^<]*)#is';
+    const FORMAT_PATTERN = '#(\\\\?)<(/?)([a-z][a-z0-9_=;-]+)?>([^\\\\<]*)#is';
+
+    /**
+     * The escape sequence for LG char.
+     */
+    const LG_CHAR_ESCAPING = '\\';
 
     private $decorated;
     private $styles = array();
     private $styleStack;
 
+    /**
+     * Escapes "<" special char in given text.
+     *
+     * @param string $text Text to escape
+     *
+     * @return string Escaped text
+     */
+    public static function escape($text)
+    {
+        return preg_replace('/([^\\\\]?)</is', '$1\\<', $text);
+    }
+
     /**
      * Initializes console output formatter.
      *
@@ -135,7 +152,9 @@ public function getStyle($name)
      */
     public function format($message)
     {
-        return preg_replace_callback(self::FORMAT_PATTERN, array($this, 'replaceStyle'), $message);
+        $message = preg_replace_callback(self::FORMAT_PATTERN, array($this, 'replaceStyle'), $message);
+
+        return str_replace(self::LG_CHAR_ESCAPING.'<', '<', $message);
     }
 
     /**
@@ -147,35 +166,40 @@ public function format($message)
      */
     private function replaceStyle($match)
     {
-        if ('' === $match[2]) {
-            if ('/' === $match[1]) {
+        // we got "\<" escaped char
+        if (self::LG_CHAR_ESCAPING === $match[1]) {
+            return $match[0];
+        }
+
+        if ('' === $match[3]) {
+            if ('/' === $match[2]) {
                 // we got "</>" tag
                 $this->styleStack->pop();
 
-                return $this->applyStyle($this->styleStack->getCurrent(), $match[3]);
+                return $this->applyStyle($this->styleStack->getCurrent(), $match[4]);
             }
 
             // we got "<>" tag
-            return '<>'.$match[3];
+            return '<>'.$match[4];
         }
 
-        if (isset($this->styles[strtolower($match[2])])) {
-            $style = $this->styles[strtolower($match[2])];
+        if (isset($this->styles[strtolower($match[3])])) {
+            $style = $this->styles[strtolower($match[3])];
         } else {
-            $style = $this->createStyleFromString($match[2]);
+            $style = $this->createStyleFromString($match[3]);
 
             if (false === $style) {
                 return $match[0];
             }
         }
 
-        if ('/' === $match[1]) {
+        if ('/' === $match[2]) {
             $this->styleStack->pop($style);
         } else {
             $this->styleStack->push($style);
         }
 
-        return $this->applyStyle($this->styleStack->getCurrent(), $match[3]);
+        return $this->applyStyle($this->styleStack->getCurrent(), $match[4]);
     }
 
     /**