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https 1#@!#!123s
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Filename : helpers.py
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"""
useful context functions, see
http://jinja.pocoo.org/docs/dev/api/#jinja2.contextfunction
"""
from typing import Any, Dict, cast

import jinja2
from aiohttp import web
from yarl import URL


@jinja2.contextfunction
def url_for(context: Dict[str, Any], __route_name: str, **parts: Any) -> URL:
    """Filter for generating urls.

    Usage: {{ url('the-view-name') }} might become "/path/to/view" or
    {{ url('item-details', id=123, query={'active': 'true'}) }}
    might become "/items/1?active=true".
    """
    app = cast(web.Application, context["app"])

    query = None
    if "query_" in parts:
        query = parts.pop("query_")

    for key in parts:
        val = parts[key]
        if isinstance(val, str):
            # if type is inherited from str expilict cast to str makes sense
            # if type is exactly str the operation is very fast
            val = str(val)
        elif type(val) is int:
            # int inherited classes like bool are forbidden
            val = str(val)
        else:
            raise TypeError(
                "argument value should be str or int, "
                "got {} -> [{}] {!r}".format(key, type(val), val)
            )
        parts[key] = val

    url = app.router[__route_name].url_for(**parts)
    if query:
        url = url.with_query(query)
    return url


@jinja2.contextfunction
def static_url(context: Dict[str, Any], static_file_path: str) -> str:
    """Filter for generating urls for static files.

    NOTE: you'll need
    to set app['static_root_url'] to be used as the root for the urls returned.

    Usage: {{ static('styles.css') }} might become
    "/static/styles.css" or "http://mycdn.example.com/styles.css"
    """
    app = context["app"]
    try:
        static_url = app["static_root_url"]
    except KeyError:
        raise RuntimeError(
            "app does not define a static root url "
            "'static_root_url', you need to set the url root "
            "with app['static_root_url'] = '<static root>'."
        ) from None
    return "{}/{}".format(static_url.rstrip("/"), static_file_path.lstrip("/"))


GLOBAL_HELPERS = dict(
    url=url_for,
    static=static_url,
)