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47 lines
1.7 KiB
47 lines
1.7 KiB
package web
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import (
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"log"
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"net/http"
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"regexp"
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)
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// A Pattern determines whether or not a given request matches some criteria.
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// They are often used in routes, which are essentially (pattern, methodSet,
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// handler) tuples. If the method and pattern match, the given handler is used.
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//
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// Built-in implementations of this interface are used to implement regular
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// expression and string matching.
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type Pattern interface {
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// In practice, most real-world routes have a string prefix that can be
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// used to quickly determine if a pattern is an eligible match. The
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// router uses the result of this function to optimize away calls to the
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// full Match function, which is likely much more expensive to compute.
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// If your Pattern does not support prefixes, this function should
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// return the empty string.
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Prefix() string
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// Returns true if the request satisfies the pattern. This function is
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// free to examine both the request and the context to make this
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// decision. Match should not modify either argument, and since it will
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// potentially be called several times over the course of matching a
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// request, it should be reasonably efficient.
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Match(r *http.Request, c *C) bool
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// Run the pattern on the request and context, modifying the context as
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// necessary to bind URL parameters or other parsed state.
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Run(r *http.Request, c *C)
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}
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func parsePattern(p interface{}) Pattern {
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switch p.(type) {
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case Pattern:
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return p.(Pattern)
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case *regexp.Regexp:
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return parseRegexpPattern(p.(*regexp.Regexp))
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case string:
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return parseStringPattern(p.(string))
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default:
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log.Fatalf("Unknown pattern type %v. Expected a web.Pattern, "+
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"regexp.Regexp, or a string.", p)
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}
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panic("log.Fatalf does not return")
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}
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