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Diffstat (limited to 'src/guile/skribilo/output.scm')
| -rw-r--r-- | src/guile/skribilo/output.scm | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/src/guile/skribilo/output.scm b/src/guile/skribilo/output.scm new file mode 100644 index 0000000..a33c040 --- /dev/null +++ b/src/guile/skribilo/output.scm @@ -0,0 +1,228 @@ +;;; output.scm -- Skribilo output stage. +;;; +;;; Copyright 2003, 2004 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr> +;;; Copyright 2005, 2006 Ludovic Courtès <ludovic.courtes@laas.fr> +;;; +;;; +;;; This program is free software; you can redistribute it and/or modify +;;; it under the terms of the GNU General Public License as published by +;;; the Free Software Foundation; either version 2 of the License, or +;;; (at your option) any later version. +;;; +;;; This program is distributed in the hope that it will be useful, +;;; but WITHOUT ANY WARRANTY; without even the implied warranty of +;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +;;; GNU General Public License for more details. +;;; +;;; You should have received a copy of the GNU General Public License +;;; along with this program; if not, write to the Free Software +;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, +;;; USA. + + +(define-module (skribilo output) + :autoload (skribilo engine) (engine-ident processor-get-engine) + :autoload (skribilo writer) (writer? writer-ident lookup-markup-writer) + :autoload (skribilo location) (location?) + :use-module (skribilo ast) + :use-module (skribilo debug) + :use-module (skribilo utils syntax) + :use-module (oop goops) + + :use-module (skribilo condition) + :use-module (srfi srfi-35) + :use-module (srfi srfi-34) + :use-module (srfi srfi-39) + + :export (output + *document-being-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. +;;; + +;; The document being output. Note: This is only meant to be used by the +;; compatibility layer in order to implement things like `find-markups'! +(define *document-being-output* (make-parameter #f)) + +(define-generic out) + +(define (%out/writer n e w) + (with-debug 5 'out/writer + (debug-item "n=" n " " (if (markup? n) (markup-markup n) "")) + (debug-item "e=" (engine-ident e)) + (debug-item "w=" (writer-ident w)) + + (when (writer? w) + (invoke (slot-ref w 'before) n e) + (invoke (slot-ref w 'action) n e) + (invoke (slot-ref w 'after) n e)))) + + + +(define (output node e . writer) + (with-debug 3 'output + (debug-item "node=" node " " (if (markup? node) (markup-markup node) "")) + (debug-item "writer=" writer) + (if (null? writer) + (out node e) + (cond + ((is-a? (car writer) <writer>) + (%out/writer node e (car writer))) + ((not (car writer)) + (raise (condition (&output-writer-error (writer writer))))) + (else + (raise (condition (&output-writer-error (writer writer))))))))) + + + +;;; +;;; OUT implementations +;;; +(define-method (out node e) + #f) + +(define-method (out (node <document>) e) + ;; Only needed by the compatibility layer. + (parameterize ((*document-being-output* node)) + (next-method))) + +(define-method (out (node <pair>) e) + (let loop ((n* node)) + (cond + ((pair? n*) + (out (car n*) e) + (loop (cdr n*))) + ((not (null? n*)) + (raise (condition (&invalid-argument-error + (proc-name output) + (argument n*)))))))) + + +(define-method (out (node <string>) e) + (let ((f (slot-ref e 'filter))) + (if (procedure? f) + (display (f node)) + (display node)))) + + +(define-method (out (node <number>) e) + (out (number->string node) e)) + + +(define-method (out (n <processor>) e) + (let ((combinator (slot-ref n 'combinator)) + (engine (slot-ref n 'engine)) + (body (slot-ref n 'body)) + (procedure (slot-ref n 'procedure))) + (let ((newe (processor-get-engine combinator engine e))) + (out (procedure body newe) newe)))) + + +(define-method (out (n <command>) e) + (let* ((fmt (slot-ref n 'fmt)) + (body (slot-ref n 'body)) + (lb (length body)) + (lf (string-length fmt))) + (define (loops i n) + (if (= i lf) + (begin + (if (> n 0) + (if (<= n lb) + (output (list-ref body (- n 1)) e) + (raise (condition (&too-few-arguments-error + (proc-name "output<command>") + (arguments n)))))) + lf) + (let ((c (string-ref fmt i))) + (cond + ((char=? c #\$) + (display "$") + (+ 1 i)) + ((not (char-numeric? c)) + (cond + ((= n 0) + i) + ((<= n lb) + (output (list-ref body (- n 1)) e) + i) + (else + (raise (condition (&too-few-arguments-error + (proc-name "output<command>") + (arguments n))))))) + (else + (loops (+ i 1) + (+ (- (char->integer c) + (char->integer #\0)) + (* 10 n)))))))) + + (let loop ((i 0)) + (cond + ((= i lf) + #f) + ((not (char=? (string-ref fmt i) #\$)) + (display (string-ref fmt i)) + (loop (+ i 1))) + (else + (loop (loops (+ i 1) 0))))))) + + +(define-method (out (n <handle>) e) + 'unspecified) + + +(define-method (out (n <unresolved>) e) + (raise (condition (&output-unresolved-error (ast n))))) + + +(define-method (out (node <markup>) e) + (let ((w (lookup-markup-writer node e))) + (if (writer? w) + (%out/writer node e w) + (output (slot-ref node 'body) e)))) |