diff options
| -rw-r--r-- | src/guile/skribilo/biblio/template.scm | 121 |
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)) ;;; |