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;;; -*- Mode: LISP; Syntax: COMMON-LISP; Package: X-HTML-TEMPLATE; Base: 10 -*-
;;; $Header: /usr/local/cvsrep/html-template/errors.lisp,v 1.8 2007/01/01 23:49:16 edi Exp $
;;; Copyright (c) 2003-2007, Dr. Edmund Weitz. All rights reserved.
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;; * Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;; * Redistributions in binary form must reproduce the above
;;; copyright notice, this list of conditions and the following
;;; disclaimer in the documentation and/or other materials
;;; provided with the distribution.
;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;;; ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
(in-package #:x-html-template)
(defstruct syntax-error-location
"Structure to store parser locations consisting of a stream, a line
number, and a column number."
line col stream)
(defvar *syntax-error-location* (make-syntax-error-location)
"Used internally to remember the last position which made sense to
the parser.")
(define-condition template-error (simple-error)
()
(:documentation "All errors signaled by X-HTML-TEMPLATE are of
this type."))
(define-condition template-invocation-error (template-error)
()
(:documentation "Signaled when X-HTML-TEMPLATE functions are
invoked with wrong arguments."))
(define-condition template-missing-value-error (template-error)
()
(:documentation "Signaled when a TMPL_VAR printer is provided
with a NIL value and *CONVERT-NIL-TO-EMPTY-STRING* is false."))
(define-condition template-not-a-string-error (template-error)
((value :initarg :value
:reader template-not-a-string-error-value))
(:documentation "Signaled when a TMPL_VAR printer is provided
with a non-string value."))
(define-condition template-syntax-error (template-error)
((line :initarg :line
:reader template-syntax-error-line)
(col :initarg :col
:reader template-syntax-error-col)
(stream :initarg :stream
:reader template-syntax-error-stream))
(:default-initargs
:line (syntax-error-location-line *syntax-error-location*)
:col (syntax-error-location-col *syntax-error-location*)
:stream (syntax-error-location-stream *syntax-error-location*))
(:report (lambda (condition stream)
(format stream "~?~%[Line ~A, column ~A, stream ~A]"
(simple-condition-format-control condition)
(simple-condition-format-arguments condition)
(template-syntax-error-line condition)
(template-syntax-error-col condition)
(template-syntax-error-stream condition))))
(:documentation "Signaled when a syntax error occurs while
parsing a template."))
(defmacro signal-template-invocation-error (format-control &rest format-arguments)
`(error 'template-invocation-error
:format-control ,format-control
:format-arguments (list ,@format-arguments)))
(defmacro signal-template-missing-value-error (format-control &rest format-arguments)
`(error 'template-missing-value-error
:format-control ,format-control
:format-arguments (list ,@format-arguments)))
(defmacro signal-template-syntax-error (format-control &rest format-arguments)
`(error 'template-syntax-error
:format-control ,format-control
:format-arguments (list ,@format-arguments)))
(defmacro with-syntax-error-location ((&rest rest) &body body)
"This is wrapped around forms in order to remember a meaningful
position within the stream in case an error has to be signaled."
(declare (ignore rest))
`(let ((*syntax-error-location* (make-syntax-error-location
:line *current-line*
:col *current-column*
:stream *standard-input*)))
,@body))
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