150 lines
4.8 KiB
Python
150 lines
4.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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flask.templating
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~~~~~~~~~~~~~~~~
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Implements the bridge to Jinja2.
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:copyright: (c) 2015 by Armin Ronacher.
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:license: BSD, see LICENSE for more details.
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"""
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from jinja2 import BaseLoader, Environment as BaseEnvironment, \
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TemplateNotFound
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from .globals import _request_ctx_stack, _app_ctx_stack
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from .signals import template_rendered, before_render_template
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def _default_template_ctx_processor():
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"""Default template context processor. Injects `request`,
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`session` and `g`.
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"""
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reqctx = _request_ctx_stack.top
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appctx = _app_ctx_stack.top
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rv = {}
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if appctx is not None:
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rv['g'] = appctx.g
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if reqctx is not None:
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rv['request'] = reqctx.request
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rv['session'] = reqctx.session
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return rv
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class Environment(BaseEnvironment):
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"""Works like a regular Jinja2 environment but has some additional
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knowledge of how Flask's blueprint works so that it can prepend the
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name of the blueprint to referenced templates if necessary.
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"""
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def __init__(self, app, **options):
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if 'loader' not in options:
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options['loader'] = app.create_global_jinja_loader()
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BaseEnvironment.__init__(self, **options)
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self.app = app
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class DispatchingJinjaLoader(BaseLoader):
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"""A loader that looks for templates in the application and all
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the blueprint folders.
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"""
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def __init__(self, app):
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self.app = app
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def get_source(self, environment, template):
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if self.app.config['EXPLAIN_TEMPLATE_LOADING']:
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return self._get_source_explained(environment, template)
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return self._get_source_fast(environment, template)
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def _get_source_explained(self, environment, template):
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attempts = []
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trv = None
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for srcobj, loader in self._iter_loaders(template):
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try:
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rv = loader.get_source(environment, template)
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if trv is None:
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trv = rv
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except TemplateNotFound:
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rv = None
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attempts.append((loader, srcobj, rv))
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from .debughelpers import explain_template_loading_attempts
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explain_template_loading_attempts(self.app, template, attempts)
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if trv is not None:
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return trv
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raise TemplateNotFound(template)
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def _get_source_fast(self, environment, template):
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for srcobj, loader in self._iter_loaders(template):
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try:
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return loader.get_source(environment, template)
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except TemplateNotFound:
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continue
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raise TemplateNotFound(template)
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def _iter_loaders(self, template):
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loader = self.app.jinja_loader
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if loader is not None:
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yield self.app, loader
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for blueprint in self.app.iter_blueprints():
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loader = blueprint.jinja_loader
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if loader is not None:
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yield blueprint, loader
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def list_templates(self):
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result = set()
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loader = self.app.jinja_loader
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if loader is not None:
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result.update(loader.list_templates())
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for blueprint in self.app.iter_blueprints():
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loader = blueprint.jinja_loader
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if loader is not None:
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for template in loader.list_templates():
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result.add(template)
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return list(result)
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def _render(template, context, app):
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"""Renders the template and fires the signal"""
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before_render_template.send(app, template=template, context=context)
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rv = template.render(context)
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template_rendered.send(app, template=template, context=context)
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return rv
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def render_template(template_name_or_list, **context):
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"""Renders a template from the template folder with the given
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context.
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:param template_name_or_list: the name of the template to be
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rendered, or an iterable with template names
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the first one existing will be rendered
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:param context: the variables that should be available in the
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context of the template.
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"""
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ctx = _app_ctx_stack.top
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ctx.app.update_template_context(context)
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return _render(ctx.app.jinja_env.get_or_select_template(template_name_or_list),
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context, ctx.app)
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def render_template_string(source, **context):
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"""Renders a template from the given template source string
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with the given context. Template variables will be autoescaped.
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:param source: the source code of the template to be
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rendered
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:param context: the variables that should be available in the
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context of the template.
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"""
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ctx = _app_ctx_stack.top
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ctx.app.update_template_context(context)
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return _render(ctx.app.jinja_env.from_string(source),
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context, ctx.app)
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