# lookup.py
# Copyright (C) 2006, 2007, 2008, 2009, 2010 Michael Bayer
# mike_mp@zzzcomputing.com
#
# This module is part of Mako and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
import os, stat, posixpath, re
from mako import exceptions, util
from mako.template import Template
try:
import threading
except:
import dummy_threading as threading
class TemplateCollection(object):
def has_template(self, uri):
try:
self.get_template(uri)
return True
except exceptions.TemplateLookupException:
return False
def get_template(self, uri, relativeto=None):
raise NotImplementedError()
def filename_to_uri(self, uri, filename):
"""Convert the given filename to a uri relative to
this TemplateCollection."""
return uri
def adjust_uri(self, uri, filename):
"""Adjust the given uri based on the calling filename.
When this method is called from the runtime, the 'filename' parameter
is taken directly to the 'filename' attribute of the calling template.
Therefore a custom TemplateCollection subclass can place any string
identifier desired in the "filename" parameter of the Template objects
it constructs and have them come back here.
"""
return uri
class TemplateLookup(TemplateCollection):
def __init__(self,
directories=None,
module_directory=None,
filesystem_checks=True,
collection_size=-1,
format_exceptions=False,
error_handler=None,
disable_unicode=False,
output_encoding=None,
encoding_errors='strict',
cache_type=None,
cache_dir=None, cache_url=None,
cache_enabled=True,
modulename_callable=None,
default_filters=None,
buffer_filters=(),
imports=None,
input_encoding=None,
preprocessor=None):
self.directories = [posixpath.normpath(d) for d in
util.to_list(directories, ())
]
self.module_directory = module_directory
self.modulename_callable = modulename_callable
self.filesystem_checks = filesystem_checks
self.collection_size = collection_size
self.template_args = {
'format_exceptions':format_exceptions,
'error_handler':error_handler,
'disable_unicode':disable_unicode,
'output_encoding':output_encoding,
'encoding_errors':encoding_errors,
'input_encoding':input_encoding,
'module_directory':module_directory,
'cache_type':cache_type,
'cache_dir':cache_dir or module_directory,
'cache_url':cache_url,
'cache_enabled':cache_enabled,
'default_filters':default_filters,
'buffer_filters':buffer_filters,
'imports':imports,
'preprocessor':preprocessor}
if collection_size == -1:
self._collection = {}
self._uri_cache = {}
else:
self._collection = util.LRUCache(collection_size)
self._uri_cache = util.LRUCache(collection_size)
self._mutex = threading.Lock()
def get_template(self, uri):
try:
if self.filesystem_checks:
return self._check(uri, self._collection[uri])
else:
return self._collection[uri]
except KeyError:
u = re.sub(r'^\/+', '', uri)
for dir in self.directories:
srcfile = posixpath.normpath(posixpath.join(dir, u))
if os.path.isfile(srcfile):
return self._load(srcfile, uri)
else:
raise exceptions.TopLevelLookupException(
"Cant locate template for uri %r" % uri)
def adjust_uri(self, uri, relativeto):
"""adjust the given uri based on the calling filename."""
if uri[0] != '/':
if relativeto is not None:
return posixpath.join(posixpath.dirname(relativeto), uri)
else:
return '/' + uri
else:
return uri
def filename_to_uri(self, filename):
try:
return self._uri_cache[filename]
except KeyError:
value = self._relativeize(filename)
self._uri_cache[filename] = value
return value
def _relativeize(self, filename):
"""Return the portion of a filename that is 'relative'
to the directories in this lookup.
"""
filename = posixpath.normpath(filename)
for dir in self.directories:
if filename[0:len(dir)] == dir:
return filename[len(dir):]
else:
return None
def _load(self, filename, uri):
self._mutex.acquire()
try:
try:
# try returning from collection one
# more time in case concurrent thread already loaded
return self._collection[uri]
except KeyError:
pass
try:
if self.modulename_callable is not None:
module_filename = self.modulename_callable(filename, uri)
else:
module_filename = None
self._collection[uri] = template = Template(
uri=uri,
filename=posixpath.normpath(filename),
lookup=self,
module_filename=module_filename,
**self.template_args)
return template
except:
# if compilation fails etc, ensure
# template is removed from collection,
# re-raise
self._collection.pop(uri, None)
raise
finally:
self._mutex.release()
def _check(self, uri, template):
if template.filename is None:
return template
if not os.path.exists(template.filename):
self._collection.pop(uri, None)
raise exceptions.TemplateLookupException(
"Cant locate template for uri %r" % uri)
elif template.module._modified_time < \
os.stat(template.filename)[stat.ST_MTIME]:
self._collection.pop(uri, None)
return self._load(template.filename, uri)
else:
return template
def put_string(self, uri, text):
self._collection[uri] = Template(
text,
lookup=self,
uri=uri,
**self.template_args)
def put_template(self, uri, template):
self._collection[uri] = template