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68 lines
2.3 KiB
Go
68 lines
2.3 KiB
Go
8 years ago
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// Copyright 2012 The Gorilla Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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/*
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Package gorilla/pat is a request router and dispatcher with a pat-like
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interface. It is an alternative to gorilla/mux that showcases how it can
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be used as a base for different API flavors. Package pat is documented at:
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http://godoc.org/github.com/bmizerany/pat
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Let's start registering a couple of URL paths and handlers:
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func main() {
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r := pat.New()
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r.Get("/products", ProductsHandler)
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r.Get("/articles", ArticlesHandler)
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r.Get("/", HomeHandler)
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http.Handle("/", r)
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}
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Here we register three routes mapping URL paths to handlers. This is
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equivalent to how http.HandleFunc() works: if an incoming GET request matches
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one of the paths, the corresponding handler is called passing
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(http.ResponseWriter, *http.Request) as parameters.
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Note: gorilla/pat matches path prefixes, so you must register the most
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specific paths first.
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Note: differently from pat, these methods accept a handler function, and not an
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http.Handler. We think this is shorter and more convenient. To set an
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http.Handler, use the Add() method.
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Paths can have variables. They are defined using the format {name} or
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{name:pattern}. If a regular expression pattern is not defined, the matched
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variable will be anything until the next slash. For example:
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r := pat.New()
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r.Get("/articles/{category}/{id:[0-9]+}", ArticleHandler)
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r.Get("/articles/{category}/", ArticlesCategoryHandler)
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r.Get("/products/{key}", ProductHandler)
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The names are used to create a map of route variables which are stored in the
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URL query, prefixed by a colon:
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category := req.URL.Query().Get(":category")
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As in the gorilla/mux package, other matchers can be added to the registered
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routes and URLs can be reversed as well. To build a URL for a route, first
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add a name to it:
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r.Get("/products/{key}", ProductHandler).Name("product")
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Then you can get it using the name and generate a URL:
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url, err := r.GetRoute("product").URL("key", "transmogrifier")
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...and the result will be a url.URL with the following path:
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"/products/transmogrifier"
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Check the mux documentation for more details about URL building and extra
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matchers:
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http://gorilla-web.appspot.com/pkg/mux/
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*/
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package pat
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