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micro-templating extensions to Pyramid routing

Project description

Route 7

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pyramid_route_7 extends pyramid’s routing to have provide a macro syntax that can be easier to maintain on larger projects.

It works through a ridiculously simple mechanism – when calling add_route_7 instead of add_route, the package expands the macros in the route declaration, then immediately calls pyramid’s own add_route.

Usage

There are two main patterns supported by pyramid_route_7:

route_kvpattern

A kvpattern ties a key to a pattern. The macro is invoked by the key, and generates both the key and pattern.

Here is a canonical example:

config.add_route_7_kvpattern("year", r"\d\d\d\d")
config.add_route_7_kvpattern("month", r"\d\d")
config.add_route_7_kvpattern("day", r"\d\d")
config.add_route_7("ymd", "/{@year}/{@month}/{@day}")

this will result in route_7 generating the following route:

config.add_route("ymd",  r"/{year:\d\d\d\d}/{month:\d\d}/{day:\d\d}")

note that they syntax for expanding a route_kvpattern is

    @ key
[at-sign] key

route_pattern

A pattern represents a reusable regex. The macro is invoked by the pattern_name, and generates only the pattern regex.

Here is a canonical example:

config.add_route_7_pattern("d4", r"\d\d\d\d")
config.add_route_7_pattern("d2", r"\d\d")
config.add_route_7("ymd", r"/{year|d4}/{month|d2}/{day|d2}")

this will result in route_7 generating the following route:

config.add_route_7("ymd",  r"/{year:\d\d\d\d}/{month:\d\d}/{day:\d\d}")

note that they syntax for expanding a route_pattern is

key [pipe] pattern

while the syntax for a route is

key [colon] regex

Warnings

If an second pattern identical to a first pattern is added, this package will not raise an exception on the second add.

However, this mimics the behavior of Pyramid itself, which allows for multiple conflicting routes to be added without raising an error.

A future version may warn or raise exceptions on conflicting routes.

FAQ:

Q: Why this package?

In larger applications (dozens of routes), it’s not uncommon to see lots of patterns re-used.

This package was designed to consolidate the patterns in one place so they can be centrally managed and upgraded over time.

Q: Why the name “route_7”?

A: Two reasons: * It makes it trivial to implement on existing projects by replacing add_route with add_route_7, and vice-versa * “The Lurid Traversal of Route 7” by Hoover, might… just might… be the best album on Dischord records. (http://www.dischord.com/release/089/lurid-traversal-of-rte-7)

Q: Any integration tips?

By default the package will emit logging activity on how it upgrades routes (expands macros) to the default logger. If you have any troubles, that will help!

A very fast way to integrate routes is just using find & replace.

Step 1 - Define Macros

Before you declare your first route like this:

config.add_route("main", "/")
config.add_route("foo", "/foo")
config.add_route("foo_paginated", r"/foo/{page:\d+}")

You should include the package and define some macros

# incude pyramid_route_7 and define our routes/macros
config.include("pyramid_route_7")
config.add_route_7_kvpattern("page", r"\d+")

     # okay, go!
     config.add_route("main", "/")
     config.add_route("foo", "/foo")
     config.add_route("foo_paginated", r"/foo/{page:\d+}")

Step 2 - Just use find & replace in a couple of passes

First, replace config.add_route with config.add_route_7:

    # incude pyramid_route_7 and define our routes/macros
    config.include("pyramid_route_7")
    config.add_route_7_kvpattern("page", r"\d+")

# okay, go!
# config.add_route("main", "/")
    config.add_route_7("main", "/")
# config.add_route("foo", "/foo")
config.add_route_7("foo", "/foo")
# config.add_route("foo_paginated", r"/foo/{page:\d+}")
config.add_route_7("foo_paginated", r"/foo/{page:\d+}")

Then find/replace your macros:

    # incude pyramid_route_7 and define our routes/macros
    config.include("pyramid_route_7")
    config.add_route_7_kvpattern("page", r"\d+")

    # okay, go!
config.add_route_7("main", "/")
config.add_route_7("foo", "/foo")
# config.add_route_7("foo_paginated", r"/foo/{page:\d+}")
config.add_route_7("foo_paginated", "/foo/{@page}")

Because add_route_7 simply expands registered macros and passes the result to Pyramid’s own add_route, you can just run it on every declared route. The performance hit is only at startup and is incredibly minimal (it’s really just a regex).

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