220 lines
7.4 KiB
Python
220 lines
7.4 KiB
Python
from __future__ import annotations
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import typing as t
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from jinja2 import BaseLoader
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from jinja2 import Environment as BaseEnvironment
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from jinja2 import Template
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from jinja2 import TemplateNotFound
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from .globals import _cv_app
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from .globals import _cv_request
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from .globals import current_app
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from .globals import request
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from .helpers import stream_with_context
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from .signals import before_render_template
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from .signals import template_rendered
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if t.TYPE_CHECKING: # pragma: no cover
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from .app import Flask
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from .sansio.app import App
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from .sansio.scaffold import Scaffold
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def _default_template_ctx_processor() -> dict[str, t.Any]:
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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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appctx = _cv_app.get(None)
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reqctx = _cv_request.get(None)
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rv: dict[str, t.Any] = {}
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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 Jinja 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: App, **options: t.Any) -> None:
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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: App) -> None:
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self.app = app
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def get_source(
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self, environment: BaseEnvironment, template: str
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) -> tuple[str, str | None, t.Callable[[], bool] | None]:
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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(
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self, environment: BaseEnvironment, template: str
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) -> tuple[str, str | None, t.Callable[[], bool] | None]:
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attempts = []
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rv: tuple[str, str | None, t.Callable[[], bool] | None] | None
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trv: None | (tuple[str, str | None, t.Callable[[], bool] | None]) = 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(
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self, environment: BaseEnvironment, template: str
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) -> tuple[str, str | None, t.Callable[[], bool] | None]:
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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: str) -> t.Iterator[tuple[Scaffold, BaseLoader]]:
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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) -> list[str]:
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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(app: Flask, template: Template, context: dict[str, t.Any]) -> str:
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app.update_template_context(context)
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before_render_template.send(
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app, _async_wrapper=app.ensure_sync, template=template, context=context
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)
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rv = template.render(context)
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template_rendered.send(
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app, _async_wrapper=app.ensure_sync, template=template, context=context
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)
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return rv
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def render_template(
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template_name_or_list: str | Template | list[str | Template],
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**context: t.Any,
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) -> str:
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"""Render a template by name with the given context.
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:param template_name_or_list: The name of the template to render. If
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a list is given, the first name to exist will be rendered.
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:param context: The variables to make available in the template.
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"""
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app = current_app._get_current_object() # type: ignore[attr-defined]
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template = app.jinja_env.get_or_select_template(template_name_or_list)
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return _render(app, template, context)
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def render_template_string(source: str, **context: t.Any) -> str:
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"""Render a template from the given source string with the given
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context.
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:param source: The source code of the template to render.
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:param context: The variables to make available in the template.
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"""
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app = current_app._get_current_object() # type: ignore[attr-defined]
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template = app.jinja_env.from_string(source)
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return _render(app, template, context)
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def _stream(
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app: Flask, template: Template, context: dict[str, t.Any]
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) -> t.Iterator[str]:
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app.update_template_context(context)
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before_render_template.send(
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app, _async_wrapper=app.ensure_sync, template=template, context=context
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)
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def generate() -> t.Iterator[str]:
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yield from template.generate(context)
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template_rendered.send(
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app, _async_wrapper=app.ensure_sync, template=template, context=context
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)
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rv = generate()
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# If a request context is active, keep it while generating.
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if request:
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rv = stream_with_context(rv)
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return rv
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def stream_template(
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template_name_or_list: str | Template | list[str | Template],
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**context: t.Any,
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) -> t.Iterator[str]:
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"""Render a template by name with the given context as a stream.
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This returns an iterator of strings, which can be used as a
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streaming response from a view.
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:param template_name_or_list: The name of the template to render. If
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a list is given, the first name to exist will be rendered.
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:param context: The variables to make available in the template.
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.. versionadded:: 2.2
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"""
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app = current_app._get_current_object() # type: ignore[attr-defined]
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template = app.jinja_env.get_or_select_template(template_name_or_list)
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return _stream(app, template, context)
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def stream_template_string(source: str, **context: t.Any) -> t.Iterator[str]:
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"""Render a template from the given source string with the given
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context as a stream. This returns an iterator of strings, which can
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be used as a streaming response from a view.
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:param source: The source code of the template to render.
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:param context: The variables to make available in the template.
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.. versionadded:: 2.2
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"""
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app = current_app._get_current_object() # type: ignore[attr-defined]
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template = app.jinja_env.from_string(source)
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return _stream(app, template, context)
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