piecrust2: piecrust/templating/jinjaengine.py comparison

comparison piecrust/templating/jinjaengine.py @ 3:f485ba500df3

Gigantic change to basically make PieCrust 2 vaguely functional. - Serving works, with debug window. - Baking works, multi-threading, with dependency handling. - Various things not implemented yet.

author	Ludovic Chabant <ludovic@chabant.com>
date	Sun, 10 Aug 2014 23:43:16 -0700
parents
children	474c9882decf

comparison

equal deleted inserted replaced

-:40fa08b261b9
+:f485ba500df3
+import re
+import time
+import logging
+import strict_rfc3339
+from jinja2 import Environment, FileSystemLoader, TemplateNotFound
+from jinja2.exceptions import TemplateSyntaxError
+from jinja2.ext import Extension, Markup
+from jinja2.nodes import CallBlock, Const
+from pygments import highlight
+from pygments.formatters import HtmlFormatter
+from pygments.lexers import get_lexer_by_name, guess_lexer
+from piecrust.rendering import format_text
+from piecrust.routing import CompositeRouteFunction
+from piecrust.templating.base import TemplateEngine, TemplateNotFoundError
+logger = logging.getLogger(__name__)
+class JinjaTemplateEngine(TemplateEngine):
+# Name `twig` is for backwards compatibility with PieCrust 1.x.
+ENGINE_NAMES = ['jinja', 'jinja2', 'twig']
+EXTENSIONS = ['jinja', 'jinja2', 'twig']
+def __init__(self):
+self.env = None
+def renderString(self, txt, data, filename=None, line_offset=0):
+self._ensureLoaded()
+tpl = self.env.from_string(txt)
+try:
+return tpl.render(data)
+except TemplateSyntaxError as tse:
+tse.lineno += line_offset
+if filename:
+tse.filename = filename
+import sys
+_, __, traceback = sys.exc_info()
+raise tse, None, traceback
+def renderFile(self, paths, data):
+self._ensureLoaded()
+tpl = None
+logger.debug("Looking for template: %s" % paths)
+for p in paths:
+try:
+tpl = self.env.get_template(p)
+break
+except TemplateNotFound:
+pass
+if tpl is None:
+raise TemplateNotFoundError()
+return tpl.render(data)
+def _ensureLoaded(self):
+if self.env:
+return
+loader = FileSystemLoader(self.app.templates_dirs)
+self.env = PieCrustEnvironment(
+self.app,
+loader=loader,
+extensions=['jinja2.ext.autoescape',
+PieCrustHighlightExtension,
+PieCrustCacheExtension])
+class PieCrustEnvironment(Environment):
+def __init__(self, app, *args, **kwargs):
+super(PieCrustEnvironment, self).__init__(*args, **kwargs)
+self.app = app
+self.globals.update({
+'fail': raise_exception})
+self.filters.update({
+'formatwith': self._formatWith,
+'markdown': lambda v: self._formatWith(v, 'markdown'),
+'textile': lambda v: self._formatWith(v, 'textile'),
+'nocache': add_no_cache_parameter,
+'wordcount': get_word_count,
+'stripoutertag': strip_outer_tag,
+'stripslash': strip_slash,
+'titlecase': title_case,
+'atomdate': get_atom_date,
+'date': get_date})
+# Backwards compatibility with PieCrust 1.x.
+self.globals.update({
+'pcfail': raise_exception})
+# Backwards compatibility with Twig.
+twig_compatibility_mode = app.config.get('jinja/twig_compatibility')
+if twig_compatibility_mode is None or twig_compatibility_mode is True:
+self.trim_blocks = True
+self.filters['raw'] = self.filters['safe']
+# Add route functions.
+for route in app.routes:
+name = route.template_func_name
+func = self.globals.get(name)
+if func is None:
+func = CompositeRouteFunction()
+func.addFunc(route)
+self.globals[name] = func
+elif isinstance(func, CompositeRouteFunction):
+self.globals[name].addFunc(route)
+else:
+raise Exception("Route function '%s' collides with an "
+"existing function or template data." %
+name)
+def _formatWith(self, value, format_name):
+return format_text(self.app, format_name, value)
+def raise_exception(msg):
+raise Exception(msg)
+def add_no_cache_parameter(value, param_name='t', param_value=None):
+if not param_value:
+param_value = time.time()
+if '?' in value:
+value += '&'
+else:
+value += '?'
+value += '%s=%s' % (param_name, param_value)
+return value
+def get_word_count(value):
+return len(value.split())
+def strip_outer_tag(value, tag=None):
+tag_pattern = '[a-z]+[a-z0-9]*'
+if tag is not None:
+tag_pattern = re.escape(tag)
+pat = r'^\<' + tag_pattern + r'\>(.*)\</' + tag_pattern + '>$'
+m = re.match(pat, value)
+if m:
+return m.group(1)
+return value
+def strip_slash(value):
+return value.rstrip('/')
+def title_case(value):
+return value.title()
+def get_atom_date(value):
+return strict_rfc3339.timestamp_to_rfc3339_localoffset(int(value))
+def get_date(value, fmt):
+return time.strftime(fmt, time.localtime(value))
+class PieCrustHighlightExtension(Extension):
+tags = set(['highlight', 'geshi'])
+def __init__(self, environment):
+super(PieCrustHighlightExtension, self).__init__(environment)
+def parse(self, parser):
+lineno = next(parser.stream).lineno
+# Extract the language name.
+args = [parser.parse_expression()]
+# Extract optional arguments.
+kwarg_names = {'line_numbers': 0, 'use_classes': 0, 'class': 1, 'id': 1}
+kwargs = {}
+while not parser.stream.current.test('block_end'):
+name = parser.stream.expect('name')
+if name.value not in kwarg_names:
+raise Exception("'%s' is not a valid argument for the code "
+"highlighting tag." % name.value)
+if kwarg_names[name.value] == 0:
+kwargs[name.value] = Const(True)
+elif parser.stream.skip_if('assign'):
+kwargs[name.value] = parser.parse_expression()
+# body of the block
+body = parser.parse_statements(['name:endhighlight', 'name:endgeshi'],
+drop_needle=True)
+return CallBlock(self.call_method('_highlight', args, kwargs),
+[], [], body).set_lineno(lineno)
+def _highlight(self, lang, line_numbers=False, use_classes=False,
+css_class=None, css_id=None, caller=None):
+# Try to be mostly compatible with Jinja2-highlight's settings.
+body = caller()
+if lang is None:
+lexer = guess_lexer(body)
+else:
+lexer = get_lexer_by_name(lang, stripall=False)
+if css_class is None:
+try:
+css_class = self.environment.jinja2_highlight_cssclass
+except AttributeError:
+pass
+if css_class is not None:
+formatter = HtmlFormatter(cssclass=css_class,
+linenos=line_numbers)
+else:
+formatter = HtmlFormatter(linenos=line_numbers)
+code = highlight(Markup(body.rstrip()).unescape(), lexer, formatter)
+return code
+class PieCrustCacheExtension(Extension):
+tags = set(['pccache'])
+def __init__(self, environment):
+super(PieCrustCacheExtension, self).__init__(environment)
+environment.extend(
+piecrust_cache_prefix='',
+piecrust_cache={}
+)
+def parse(self, parser):
+# the first token is the token that started the tag.  In our case
+# we only listen to ``'pccache'`` so this will be a name token with
+# `pccache` as value.  We get the line number so that we can give
+# that line number to the nodes we create by hand.
+lineno = parser.stream.next().lineno
+# now we parse a single expression that is used as cache key.
+args = [parser.parse_expression()]
+# now we parse the body of the cache block up to `endpccache` and
+# drop the needle (which would always be `endpccache` in that case)
+body = parser.parse_statements(['name:endpccache'], drop_needle=True)
+# now return a `CallBlock` node that calls our _cache_support
+# helper method on this extension.
+return CallBlock(self.call_method('_cache_support', args),
+[], [], body).set_lineno(lineno)
+def _cache_support(self, name, caller):
+key = self.environment.piecrust_cache_prefix + name
+# try to load the block from the cache
+# if there is no fragment in the cache, render it and store
+# it in the cache.
+rv = self.environment.piecrust_cache.get(key)
+if rv is not None:
+return rv
+rv = caller()
+self.environment.piecrust_cache[key] = rv
+return rv

Mercurial > piecrust2

comparison piecrust/templating/jinjaengine.py @ 3:f485ba500df3