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-rw-r--r--src/guile/skribilo/biblio/template.scm121
1 files changed, 74 insertions, 47 deletions
diff --git a/src/guile/skribilo/biblio/template.scm b/src/guile/skribilo/biblio/template.scm
index 067f07a..0917a93 100644
--- a/src/guile/skribilo/biblio/template.scm
+++ b/src/guile/skribilo/biblio/template.scm
@@ -20,6 +20,7 @@
;;; USA.
(define-module (skribilo biblio template)
+ :use-module (srfi srfi-1)
:use-module (skribilo ast)
:autoload (skribilo lib) (skribe-error)
:autoload (skribilo output) (output)
@@ -28,7 +29,8 @@
:use-module (skribilo utils syntax)
- :export (output-bib-entry-template
+ :export (evaluate-bib-entry-template
+ output-bib-entry-template
make-bib-entry-template/default
make-bib-entry-template/skribe))
@@ -52,57 +54,82 @@
;;; Outputting a bibliography entry template for a specific entry.
;;;
+(define (evaluate-bib-entry-template bib template . rest)
+ ;; An interpreter for the bibliography template language. Overview of the
+ ;; language:
+ ;;
+ ;; form := (cond-list|special-sexp|string|field-spec)
+ ;;
+ ;; field-spec := ("author"|"title"|...)
+ ;; cond-list := (form+)
+ ;; special-sexp := (("if" form form form?)|("or" form*))
+ ;;
+ ;; A `cond-list' gets issued only if all its elements are true.
+
+ (define get-field
+ (if (null? rest)
+ markup-option
+ (car rest)))
+
+ (define (eval-cond-list sexp eval-sexp)
+ (let loop ((sexp sexp)
+ (result '()))
+ (if (null? sexp)
+ (reverse! result)
+ (let ((head (eval-sexp (car sexp))))
+ (if (not head)
+ #f
+ (loop (cdr sexp)
+ (cons head result)))))))
+
+ (define (eval-special-sexp sexp eval-sexp)
+ (let ((special (car sexp))
+ (formals (cdr sexp)))
+ (case special
+ ((or)
+ (any eval-sexp formals))
+ ((if)
+ (if (or (> (length formals) 3)
+ (< (length formals) 2))
+ (error (_ "wrong number of arguments to `if' template")
+ formals))
+ (let* ((if-cond (car formals))
+ (if-then (cadr formals))
+ (if-else (if (null? (cddr formals))
+ #f
+ (caddr formals)))
+ (result (eval-sexp if-cond)))
+ (if result
+ (eval-sexp if-then)
+ (eval-sexp if-else))))
+ (else
+ (eval-cond-list sexp eval-sexp)))))
+
+ (let loop ((template template))
+ (cond ((symbol? template)
+ (get-field bib template))
+ ((null? template)
+ #f)
+ ((pair? template)
+ (cond ((symbol? (car template))
+ (eval-special-sexp template loop))
+ (else
+ (eval-cond-list template loop))))
+ ((string? template)
+ template)
+ (else
+ (error (_ "invalid bibliography entry template") template)))))
+
+
(define* (output-bib-entry-template bib engine template
:optional (get-field markup-option))
;; Output the fields of BIB (a bibliography entry) for ENGINE according to
;; TEMPLATE. Example of templates are found below (e.g.,
;; `make-bib-entry-template/default').
- (let loop ((template template)
- (pending #f)
- (armed #f))
- (cond
- ((null? template)
- 'done)
- ((pair? (car template))
- (if (eq? (caar template) 'or)
- (let ((o1 (cadr (car template))))
- (if (get-field bib o1)
- (loop (cons o1 (cdr template))
- pending
- #t)
- (let ((o2 (caddr (car template))))
- (loop (cons o2 (cdr template))
- pending
- armed))))
- (let ((o (get-field bib (cadr (car template)))))
- (if o
- (begin
- (if (and pending armed)
- (output pending engine))
- (output (caar template) engine)
- (output o engine)
- (if (pair? (cddr (car template)))
- (output (caddr (car template)) engine))
- (loop (cdr template) #f #t))
- (loop (cdr template) pending armed)))))
- ((symbol? (car template))
- (let ((o (get-field bib (car template))))
- (if o
- (begin
- (if (and armed pending)
- (output pending engine))
- (output o engine)
- (loop (cdr template) #f #t))
- (loop (cdr template) pending armed))))
- ((null? (cdr template))
- (output (car template) engine))
- ((string? (car template))
- (if pending (output pending engine))
- (loop (cdr template) (car template) armed))
- (else
- (skribe-error 'output-bib-fields
- "Illegal templateiption"
- (car template))))))
+ (output (map (lambda (form)
+ (evaluate-bib-entry-template bib form get-field))
+ template)
+ engine))
;;;