42 lines
1.6 KiB
Scheme
42 lines
1.6 KiB
Scheme
;;; Error stuff for the http server. -*- Scheme -*-
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;;; This file is part of the Scheme Untergrund Networking package.
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;;; Copyright (c) 1995 by Olin Shivers.
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;;; For copyright information, see the file COPYING which comes with
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;;; the distribution.
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;;; An http error condition is a data structure with the following pieces:
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;;; (error-code request message . irritants)
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;;; You recognise one with HTTP-ERROR?, and retrieve the pieces with
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;;; CONDITION-STUFF.
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;;;
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;;; HTTP error condition
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; Define a sub-type of the S48 error condition, the HTTP error condition.
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;;; An HTTP error is one that corresponds to one of the HTTP error response
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;;; codes, so you can reliably use an HTTP error condition to construct an
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;;; error response message to send back to the HTTP client.
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(define-condition-type 'http-error '(error))
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(define http-error? (condition-predicate 'http-error))
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(define (http-error status-code req . args)
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(apply signal 'http-error status-code req args))
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;;; Syntax error condition
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; Scheme 48 has a "syntax error" error condition, but it isn't an error
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;;; condition! It's a warning condition. I don't understand this.
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;;; We define a *fatal* syntax error here for the parsers to use.
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(define-condition-type 'fatal-syntax-error '(error))
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(define fatal-syntax-error? (condition-predicate 'fatal-syntax-error))
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(define (fatal-syntax-error msg . irritants)
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(apply signal 'fatal-syntax-error msg irritants))
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