86 lines
2.6 KiB
Go
86 lines
2.6 KiB
Go
package pathmatch
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import (
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"fmt"
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)
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// PatternSyntaxError is used to represent a specific kind of BadRequest error.
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// Specifically, it represents a syntax error in the uncompiled pattern passed to the
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// pathmatch.Compile() func.
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//
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// Example usage is as follows:
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//
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// pattern, err := pathmatch.Compile("/something/{there_is_a_syntax_error_in_this_pattern")
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// if nil != err {
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// switch err.(type) {
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//
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// case pathmatch.PatternSyntaxError: // ← Here we are detecting if the error returned was due to a syntax error, in the uncompiled pattern. Also note that it comes BEFORE the 'pathmatch.BadRequest' case; THAT IS IMPORTANT!
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//
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// fmt.Printf("The uncompiled pattern passed to pathmatch.Compile() had a syntax error in it. The error message describing the syntax error is....\n%s\n", err.Error())
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// return
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//
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// case pathmatch.BadRequest:
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//
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// fmt.Printf("Something you did when you called pathmatch.Compile() caused an error. The error message was....\n%s\n", err.Error())
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// return
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//
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// case pathmatch.InternalError:
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//
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// fmt.Printf("It's not your fault; it's our fault. Something bad happened internally when pathmatch.Compile() was running. The error message was....\n%s\n", err.Error())
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// return
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//
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// default:
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//
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// fmt.Printf("Some kind of unexpected error happend: %v", err)
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// return
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// }
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// }
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type PatternSyntaxError interface {
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BadRequest
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PatternSyntaxError()
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}
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// internalPatternSyntaxError is the only underlying implementation that fits the
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// PatternSyntaxError interface, in this library.
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type internalPatternSyntaxError struct {
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msg string
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}
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// newPatternSyntaxError creates a new internalPatternSyntaxError (struct) and
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// returns it as a PatternSyntaxError (interface).
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func newPatternSyntaxError(format string, a ...interface{}) PatternSyntaxError {
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msg := fmt.Sprintf(format, a...)
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err := internalPatternSyntaxError{
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msg:msg,
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}
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return &err
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}
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// Error method is necessary to satisfy the 'error' interface (and the
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// PatternSyntaxError interface).
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func (err *internalPatternSyntaxError) Error() string {
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s := fmt.Sprintf("Bad Request: Syntax Error: %s", err.msg)
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return s
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}
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// BadRequest method is necessary to satisfy the 'InternalError' interface.
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// It exists to make this error type detectable in a Go type-switch.
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func (err *internalPatternSyntaxError) BadRequest() {
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// Nothing here.
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}
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// PatternSyntaxError method is necessary to satisfy the 'PatternSyntaxError' interface.
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// It exists to make this error type detectable in a Go type-switch.
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func (err *internalPatternSyntaxError) PatternSyntaxError() {
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// Nothing here.
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}
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