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128 lines
4.0 KiB
128 lines
4.0 KiB
from pathlib import Path
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import jinja2
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from django.conf import settings
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from django.template import TemplateDoesNotExist, TemplateSyntaxError
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from django.utils.functional import cached_property
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from django.utils.module_loading import import_string
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from .base import BaseEngine
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class Jinja2(BaseEngine):
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app_dirname = "jinja2"
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def __init__(self, params):
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params = params.copy()
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options = params.pop("OPTIONS").copy()
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super().__init__(params)
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self.context_processors = options.pop("context_processors", [])
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environment = options.pop("environment", "jinja2.Environment")
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environment_cls = import_string(environment)
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if "loader" not in options:
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options["loader"] = jinja2.FileSystemLoader(self.template_dirs)
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options.setdefault("autoescape", True)
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options.setdefault("auto_reload", settings.DEBUG)
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options.setdefault(
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"undefined", jinja2.DebugUndefined if settings.DEBUG else jinja2.Undefined
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)
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self.env = environment_cls(**options)
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def from_string(self, template_code):
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return Template(self.env.from_string(template_code), self)
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def get_template(self, template_name):
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try:
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return Template(self.env.get_template(template_name), self)
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except jinja2.TemplateNotFound as exc:
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raise TemplateDoesNotExist(exc.name, backend=self) from exc
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except jinja2.TemplateSyntaxError as exc:
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new = TemplateSyntaxError(exc.args)
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new.template_debug = get_exception_info(exc)
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raise new from exc
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@cached_property
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def template_context_processors(self):
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return [import_string(path) for path in self.context_processors]
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class Template:
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def __init__(self, template, backend):
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self.template = template
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self.backend = backend
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self.origin = Origin(
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name=template.filename,
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template_name=template.name,
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)
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def render(self, context=None, request=None):
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from .utils import csrf_input_lazy, csrf_token_lazy
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if context is None:
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context = {}
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if request is not None:
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context["request"] = request
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context["csrf_input"] = csrf_input_lazy(request)
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context["csrf_token"] = csrf_token_lazy(request)
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for context_processor in self.backend.template_context_processors:
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context.update(context_processor(request))
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try:
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return self.template.render(context)
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except jinja2.TemplateSyntaxError as exc:
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new = TemplateSyntaxError(exc.args)
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new.template_debug = get_exception_info(exc)
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raise new from exc
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class Origin:
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"""
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A container to hold debug information as described in the template API
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documentation.
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"""
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def __init__(self, name, template_name):
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self.name = name
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self.template_name = template_name
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def get_exception_info(exception):
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"""
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Format exception information for display on the debug page using the
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structure described in the template API documentation.
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"""
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context_lines = 10
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lineno = exception.lineno
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source = exception.source
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if source is None:
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exception_file = Path(exception.filename)
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if exception_file.exists():
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with open(exception_file, "r") as fp:
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source = fp.read()
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if source is not None:
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lines = list(enumerate(source.strip().split("\n"), start=1))
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during = lines[lineno - 1][1]
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total = len(lines)
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top = max(0, lineno - context_lines - 1)
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bottom = min(total, lineno + context_lines)
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else:
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during = ""
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lines = []
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total = top = bottom = 0
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return {
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"name": exception.filename,
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"message": exception.message,
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"source_lines": lines[top:bottom],
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"line": lineno,
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"before": "",
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"during": during,
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"after": "",
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"total": total,
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"top": top,
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"bottom": bottom,
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}
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