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+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2005 Edgewall Software
+# Copyright (C) 2005 Christian Boos <cboos@bct-technology.com>
+# Copyright (C) 2005 Christopher Lenz <cmlenz@gmx.de>
+# All rights reserved.
+#
+# This software is licensed as described in the file COPYING, which
+# you should have received as part of this distribution. The terms
+# are also available at http://trac.edgewall.com/license.html.
+#
+# This software consists of voluntary contributions made by many
+# individuals. For the exact contribution history, see the revision
+# history and logs, available at http://projects.edgewall.com/trac/.
+#
+# Author: Christian Boos <cboos@bct-technology.com>
+#         Christopher Lenz <cmlenz@gmx.de>
+
+import re
+
+from trac.core import *
+from trac.config import Option
+from trac.mimeview.api import IHTMLPreviewRenderer, content_to_unicode
+from trac.util import NaivePopen
+from trac.util.markup import Deuglifier
+
+__all__ = ['PHPRenderer']
+
+php_types = ('text/x-php', 'application/x-httpd-php',
+             'application/x-httpd-php4', 'application/x-httpd-php1')
+
+
+class PhpDeuglifier(Deuglifier):
+
+    def format(self, indata):
+        # The PHP highlighter produces the end-span tags on the next line
+        # instead of the line they actually apply to, which causes
+        # Trac to produce lots of (useless) open-and-immediately-close
+        # spans beginning each line.  This tries to curtail by bubbling
+        # the first span after a set of 1+ "<br />" to before them.
+        r_fixeol = re.compile(r"((?:<br />)+)(</(?:font|span)>)")
+        indata = r_fixeol.sub(lambda m: m.group(2) + m.group(1), indata)
+        
+        # Now call superclass implementation that handles the dirty work
+        # of applying css classes.
+        return Deuglifier.format(self, indata)
+
+    def rules(cls):
+        colors = dict(comment='FF8000', lang='0000BB', keyword='007700',
+                      string='DD0000')
+        # rules check for <font> for PHP 4 or <span> for PHP 5
+        color_rules = [
+            r'(?P<%s><(?:font color="|span style="color: )#%s">)' % c
+            for c in colors.items()
+            ]
+        return color_rules + [ r'(?P<font><font.*?>)', r'(?P<endfont></font>)' ]
+    rules = classmethod(rules)
+
+class PHPRenderer(Component):
+    """
+    Syntax highlighting using the PHP executable if available.
+    """
+
+    implements(IHTMLPreviewRenderer)
+
+    path = Option('mimeviewer', 'php_path', 'php',
+        """Path to the PHP executable (''since 0.9'').""")
+
+    # IHTMLPreviewRenderer methods
+
+    def get_quality_ratio(self, mimetype):
+        if mimetype in php_types:
+            return 4
+        return 0
+
+    def render(self, req, mimetype, content, filename=None, rev=None):
+        cmdline = self.config.get('mimeviewer', 'php_path')
+        # -n to ignore php.ini so we're using default colors
+        cmdline += ' -sn'
+        self.env.log.debug("PHP command line: %s" % cmdline)
+        
+        content = content_to_unicode(self.env, content, mimetype)
+        content = content.encode('utf-8')
+        np = NaivePopen(cmdline, content, capturestderr=1)
+        if np.errorlevel or np.err:
+            err = 'Running (%s) failed: %s, %s.' % (cmdline, np.errorlevel,
+                                                    np.err)
+            raise Exception, err
+        odata = ''.join(np.out.splitlines()[1:-2])
+        if odata.startswith('X-Powered-By'):
+            raise TracError, 'You appear to be using the PHP CGI binary.  ' \
+                             'Trac requires the CLI version for syntax ' \
+                             'highlighting.'
+
+        html = PhpDeuglifier().format(odata.decode('utf-8'))
+        for line in html.split('<br />'):
+            # PHP generates _way_ too many non-breaking spaces...
+            # We don't need them anyway, so replace them by normal spaces
+            yield line.replace('&nbsp;', ' ')