1 files changed, 63 insertions, 0 deletions
diff --git a/pygments/lexers/iolang.py b/pygments/lexers/iolang.py
new file mode 100644
index 00000000..e62dd434
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+++ b/pygments/lexers/iolang.py
@@ -0,0 +1,63 @@
+# -*- coding: utf-8 -*-
+"""
+    pygments.lexers.iolang
+    ~~~~~~~~~~~~~~~~~~~~~~
+
+    Lexers for the Io language.
+
+    :copyright: Copyright 2006-2015 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+from pygments.lexer import RegexLexer
+from pygments.token import Text, Comment, Operator, Keyword, Name, String, \
+    Number
+
+__all__ = ['IoLexer']
+
+
+class IoLexer(RegexLexer):
+    """
+    For `Io <http://iolanguage.com/>`_ (a small, prototype-based
+    programming language) source.
+
+    .. versionadded:: 0.10
+    """
+    name = 'Io'
+    filenames = ['*.io']
+    aliases = ['io']
+    mimetypes = ['text/x-iosrc']
+    tokens = {
+        'root': [
+            (r'\n', Text),
+            (r'\s+', Text),
+            # Comments
+            (r'//(.*?)\n', Comment.Single),
+            (r'#(.*?)\n', Comment.Single),
+            (r'/(\\\n)?[*](.|\n)*?[*](\\\n)?/', Comment.Multiline),
+            (r'/\+', Comment.Multiline, 'nestedcomment'),
+            # DoubleQuotedString
+            (r'"(\\\\|\\"|[^"])*"', String),
+            # Operators
+            (r'::=|:=|=|\(|\)|;|,|\*|-|\+|>|<|@|!|/|\||\^|\.|%|&|\[|\]|\{|\}',
+             Operator),
+            # keywords
+            (r'(clone|do|doFile|doString|method|for|if|else|elseif|then)\b',
+             Keyword),
+            # constants
+            (r'(nil|false|true)\b', Name.Constant),
+            # names
+            (r'(Object|list|List|Map|args|Sequence|Coroutine|File)\b',
+             Name.Builtin),
+            ('[a-zA-Z_]\w*', Name),
+            # numbers
+            (r'(\d+\.?\d*|\d*\.\d+)([eE][+-]?[0-9]+)?', Number.Float),
+            (r'\d+', Number.Integer)
+        ],
+        'nestedcomment': [
+            (r'[^+/]+', Comment.Multiline),
+            (r'/\+', Comment.Multiline, '#push'),
+            (r'\+/', Comment.Multiline, '#pop'),
+            (r'[+/]', Comment.Multiline),
+        ]
+    }