1 files changed, 87 insertions, 0 deletions
diff --git a/pygments/lexers/prolog.py b/pygments/lexers/prolog.py
new file mode 100644
index 00000000..5b705a0b
--- /dev/null
+++ b/pygments/lexers/prolog.py
@@ -0,0 +1,87 @@
+# -*- coding: utf-8 -*-
+"""
+    pygments.lexers.prolog
+    ~~~~~~~~~~~~~~~~~~~~~~
+
+    Lexers for Prolog and Prolog-like languages.
+
+    :copyright: Copyright 2006-2014 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+import re
+
+from pygments.lexer import RegexLexer, include, bygroups, using, \
+    this, inherit, default, words
+from pygments.util import get_bool_opt
+from pygments.token import Text, Comment, Operator, Keyword, Name, String, \
+    Number, Punctuation, Error
+
+__all__ = ['PrologLexer']
+
+
+class PrologLexer(RegexLexer):
+    """
+    Lexer for Prolog files.
+    """
+    name = 'Prolog'
+    aliases = ['prolog']
+    filenames = ['*.prolog', '*.pro', '*.pl']
+    mimetypes = ['text/x-prolog']
+
+    flags = re.UNICODE
+
+    tokens = {
+        'root': [
+            (r'^#.*', Comment.Single),
+            (r'/\*', Comment.Multiline, 'nested-comment'),
+            (r'%.*', Comment.Single),
+            # character literal
+            (r'0\'.', String.Char),
+            (r'0b[01]+', Number.Bin),
+            (r'0o[0-7]+', Number.Oct),
+            (r'0x[0-9a-fA-F]+', Number.Hex),
+            # literal with prepended base
+            (r'\d\d?\'[a-zA-Z0-9]+', Number.Integer),
+            (r'(\d+\.\d*|\d*\.\d+)([eE][+-]?[0-9]+)?', Number.Float),
+            (r'\d+', Number.Integer),
+            (r'[\[\](){}|.,;!]', Punctuation),
+            (r':-|-->', Punctuation),
+            (r'"(?:\\x[0-9a-fA-F]+\\|\\u[0-9a-fA-F]{4}|\\U[0-9a-fA-F]{8}|'
+             r'\\[0-7]+\\|\\["\nabcefnrstv]|[^\\"])*"', String.Double),
+            (r"'(?:''|[^'])*'", String.Atom),  # quoted atom
+            # Needs to not be followed by an atom.
+            # (r'=(?=\s|[a-zA-Z\[])', Operator),
+            (r'is\b', Operator),
+            (r'(<|>|=<|>=|==|=:=|=|/|//|\*|\+|-)(?=\s|[a-zA-Z0-9\[])',
+             Operator),
+            (r'(mod|div|not)\b', Operator),
+            (r'_', Keyword),  # The don't-care variable
+            (r'([a-z]+)(:)', bygroups(Name.Namespace, Punctuation)),
+            (u'([a-z\u00c0-\u1fff\u3040-\ud7ff\ue000-\uffef]'
+             u'[\w$\u00c0-\u1fff\u3040-\ud7ff\ue000-\uffef]*)'
+             u'(\\s*)(:-|-->)',
+             bygroups(Name.Function, Text, Operator)),  # function defn
+            (u'([a-z\u00c0-\u1fff\u3040-\ud7ff\ue000-\uffef]'
+             u'[\w$\u00c0-\u1fff\u3040-\ud7ff\ue000-\uffef]*)'
+             u'(\\s*)(\\()',
+             bygroups(Name.Function, Text, Punctuation)),
+            (u'[a-z\u00c0-\u1fff\u3040-\ud7ff\ue000-\uffef]'
+             u'[\w$\u00c0-\u1fff\u3040-\ud7ff\ue000-\uffef]*',
+             String.Atom),  # atom, characters
+            # This one includes !
+            (u'[#&*+\\-./:<=>?@\\\\^~\u00a1-\u00bf\u2010-\u303f]+',
+             String.Atom),  # atom, graphics
+            (r'[A-Z_]\w*', Name.Variable),
+            (u'\\s+|[\u2000-\u200f\ufff0-\ufffe\uffef]', Text),
+        ],
+        'nested-comment': [
+            (r'\*/', Comment.Multiline, '#pop'),
+            (r'/\*', Comment.Multiline, '#push'),
+            (r'[^*/]+', Comment.Multiline),
+            (r'[*/]', Comment.Multiline),
+        ],
+    }
+
+    def analyse_text(text):
+        return ':-' in text