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-rw-r--r--src/guile/skribilo/output.scm81
1 files changed, 69 insertions, 12 deletions
diff --git a/src/guile/skribilo/output.scm b/src/guile/skribilo/output.scm
index 02633f1..becf2f1 100644
--- a/src/guile/skribilo/output.scm
+++ b/src/guile/skribilo/output.scm
@@ -1,7 +1,7 @@
;;; output.scm -- Skribilo output stage.
;;;
;;; Copyright 2003-2004 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
-;;; Copyright 2005 Ludovic Courtès <ludovic.courtes@laas.fr>
+;;; Copyright 2005, 2006 Ludovic Courtès <ludovic.courtes@laas.fr>
;;;
;;;
;;; This program is free software; you can redistribute it and/or modify
@@ -21,18 +21,70 @@
(define-module (skribilo output)
- :export (output)
:autoload (skribilo engine) (engine-ident processor-get-engine)
:autoload (skribilo writer) (writer? writer-ident lookup-markup-writer)
- :use-module (skribilo lib)
+ :autoload (skribilo location) (location?)
:use-module (skribilo ast)
:use-module (skribilo debug)
:use-module (skribilo utils syntax)
- :use-module (oop goops))
+ :use-module (oop goops)
+
+ :use-module (skribilo condition)
+ :use-module (srfi srfi-35)
+ :use-module (srfi srfi-34)
+
+ :export (output
+ &output-error &output-unresolved-error &output-writer-error
+ output-error? output-unresolved-error? output-writer-error?))
+
(fluid-set! current-reader %skribilo-module-reader)
+;;;
+;;; Error conditions.
+;;;
+
+(define-condition-type &output-error &skribilo-error
+ output-error?)
+
+(define-condition-type &output-unresolved-error &output-error
+ output-unresolved-error?
+ (ast output-unresolved-error:ast))
+
+(define-condition-type &output-writer-error &output-error
+ output-writer-error?
+ (writer output-writer-error:writer))
+
+
+(define (handle-output-error c)
+ ;; Issue a user-friendly error message for error condition C.
+ (cond ((output-unresolved-error? c)
+ (let* ((node (output-unresolved-error:ast c))
+ (location (and (ast? node) (ast-loc node))))
+ (format (current-error-port) "unresolved node: ~a~a~%"
+ node
+ (if (location? location)
+ (string-append " "
+ (location-file location) ":"
+ (location-line location))
+ ""))))
+ ((output-writer-error? c)
+ (format (current-error-port) "invalid writer: ~a~%"
+ (output-writer-error:writer c)))
+ (else
+ (format (current-error-port) "undefined output error: ~a~%"
+ c))))
+
+(register-error-condition-handler! output-error?
+ handle-output-error)
+
+
+
+;;;
+;;; Output method.
+;;;
+
(define-generic out)
(define (%out/writer n e w)
@@ -58,11 +110,10 @@
((is-a? (car writer) <writer>)
(%out/writer node e (car writer)))
((not (car writer))
- (skribe-error 'output
- (format #f "illegal ~A user writer" (engine-ident e))
- (if (markup? node) (markup-markup node) node)))
+ (raise (condition (&output-writer-error (writer writer)))))
(else
- (skribe-error 'output "illegal user writer" (car writer)))))))
+ (raise (condition (&output-writer-error (writer writer)))))))))
+
;;;
@@ -79,7 +130,9 @@
(out (car n*) e)
(loop (cdr n*)))
((not (null? n*))
- (skribe-error 'out "Illegal argument" n*)))))
+ (raise (condition (&invalid-argument-error
+ (proc-name output)
+ (argument n*))))))))
(define-method (out (node <string>) e)
@@ -113,7 +166,9 @@
(if (> n 0)
(if (<= n lb)
(output (list-ref body (- n 1)) e)
- (skribe-error '! "Too few arguments provided" n)))
+ (raise (condition (&too-few-arguments-error
+ (proc-name "output<command>")
+ (arguments n))))))
lf)
(let ((c (string-ref fmt i)))
(cond
@@ -128,7 +183,9 @@
(output (list-ref body (- n 1)) e)
i)
(else
- (skribe-error '! "Too few arguments provided" n))))
+ (raise (condition (&too-few-arguments-error
+ (proc-name "output<command>")
+ (arguments n)))))))
(else
(loops (+ i 1)
(+ (- (char->integer c)
@@ -151,7 +208,7 @@
(define-method (out (n <unresolved>) e)
- (skribe-error 'output "orphan unresolved" n))
+ (raise (condition (&output-unresolved-error (ast n)))))
(define-method (out (node <markup>) e)