Feature/add ss2 ss3 support

README.md

@@ -75,6 +75,12 @@ are supported as defined in [ISO/IEC 2022](https://en.wikipedia.org/wiki/ISO/IEC
 
 * PM (Privacy Message)
 
+* SS2 (Single Shift 2)
+  this means select the following character form the G2 character set
+
+* SS3 (Single Shift 3)
+  this means select the following character form the G3 character set
+
 Each code sequence gets emitted with a dedicated event with its raw byte sequence:
 
 ```php
@@ -90,6 +96,8 @@ $stream->on('osc', function ($sequence) { … });
 $stream->on('apc', function ($sequence) { … });
 $stream->on('dps', function ($sequence) { … });
 $stream->on('pm', function ($sequence) { … });
+$stream->on('ss2', function ($sequence) { … });
+$stream->on('ss3', function ($sequence) { … });
 ```
 
 Other lesser known [C1 control codes](https://en.wikipedia.org/wiki/C0_and_C1_control_codes#C1_set)

src/ControlCodeParser.php

@@ -21,6 +21,8 @@ class ControlCodeParser extends EventEmitter implements ReadableStreamInterface
      * followed by "_" means it's APC (Application Program-Control)
      * followed by "P" means it's DPS (Device-Control string)
      * followed by "^" means it's PM (Privacy Message)
+     * followed by "N" means it's SS2 (Single Shift 2)
+     * followed by "O" means it's SS3 (Single Shift 3)
      *
      * Each of these will be parsed until the sequence ends and then emitted
      * under their respective name.
@@ -39,6 +41,8 @@ class ControlCodeParser extends EventEmitter implements ReadableStreamInterface
         '_' => 'apc',
         'P' => 'dps',
         '^' => 'pm',
+        'N' => 'ss2',
+        'O' => 'ss3',
     );
 
     public function __construct(ReadableStreamInterface $input)
@@ -171,6 +175,12 @@ public function handleData($data)
                         break;
                     }
                 }
+            } else if ($type === 'ss2' || $type === 'ss3') {
+                $data = substr($this->buffer, 0, 3);
+                $this->buffer = (string) substr($this->buffer, 3);
+
+                $this->emit($type, array($data));
+                $found = true;
             } else {
                 // all other types are terminated by ST
                 // only OSC can also be terminted by BEL (whichever comes first)

tests/ControlCodeParserTest.php

@@ -226,6 +226,38 @@ public function testDoesNotEmitDpsIfItDoesNotEndWithSt()
         $this->input->emit('data', array("\x1BPasd\x07"));
     }
 
+    public function testEmitsSs2AndData()
+    {
+        $this->parser->on('data', $this->expectCallableOnceWith('hello'));
+        $this->parser->on('ss2', $this->expectCallableOnceWith("\x1BNE"));
+
+        $this->input->emit('data', array("\x1BNEhello"));
+    }
+
+    public function testEmitsDataAndSs2()
+    {
+        $this->parser->on('data', $this->expectCallableOnceWith('hello'));
+        $this->parser->on('ss2', $this->expectCallableOnceWith("\x1BNE"));
+
+        $this->input->emit('data', array("hello\x1BNE"));
+    }
+
+    public function testEmitsSs3AndData()
+    {
+        $this->parser->on('data', $this->expectCallableOnceWith('hello'));
+        $this->parser->on('ss3', $this->expectCallableOnceWith("\x1BOP"));
+
+        $this->input->emit('data', array("\x1BOPhello"));
+    }
+
+    public function testEmitsDataAndSs3()
+    {
+        $this->parser->on('data', $this->expectCallableOnceWith('hello'));
+        $this->parser->on('ss3', $this->expectCallableOnceWith("\x1BOP"));
+
+        $this->input->emit('data', array("hello\x1BOP"));
+    }
+
     public function testEmitsUnknownC1AsOneChunk()
     {
         $this->parser->on('data', $this->expectCallableNever());