;;;; This file is part of LilyPond, the GNU music typesetter.
;;;;
-;;;; Copyright (C) 2004--2011 Nicolas Sceaux <nicolas.sceaux@free.fr>
+;;;; Copyright (C) 2004--2014 Nicolas Sceaux <nicolas.sceaux@free.fr>
;;;; Jan Nieuwenhuizen <janneke@gnu.org>
;;;;
;;;; LilyPond is free software: you can redistribute it and/or modify
"Read a lilypond music expression enclosed within @code{#@{} and @code{#@}}
from @var{port} and return the corresponding Scheme music expression.
@samp{$} and @samp{#} introduce immediate and normal Scheme forms."
- (let ((lily-string (call-with-output-string
- (lambda (out)
- (do ((c (read-char port) (read-char port)))
- ((and (char=? c #\#)
- (char=? (peek-char port) #\})) ;; we stop when #} is encountered
- (read-char port))
- ;; a #scheme or $scheme expression
- (if (or (char=? c #\#) (char=? c #\$))
- (format out "~a~s" c (read port))
- ;; other characters
- (display c out)))))))
- `(let* ((clone
- (ly:parser-clone parser (procedure-environment (lambda () '()))))
- (result (begin
- (ly:parser-clear-error clone)
- (ly:parse-string-expression clone ,lily-string))))
- (if (ly:parser-has-error? clone)
- (ly:parser-error parser (_ "error in #{ ... #}")))
- result)))
+ (let* ((closures '())
+ (filename (port-filename port))
+ (line (port-line port))
+ (lily-string (call-with-output-string
+ (lambda (out)
+ (let ((copycat
+ (make-soft-port
+ (vector #f #f #f
+ (lambda ()
+ (let ((x (read-char port)))
+ (write-char x out)
+ x)) #f)
+ "r")))
+ (set-port-filename! copycat filename)
+ (do ((c (read-char port) (read-char port)))
+ ((and (char=? c #\#)
+ (char=? (peek-char port) #\}))
+ ;; we stop when #} is encountered
+ (read-char port))
+ (write-char c out)
+ ;; a #scheme or $scheme expression
+ (if (or (char=? c #\#) (char=? c #\$))
+ (let* ((p (ftell out))
+ (expr
+ (begin
+ (set-port-line! copycat
+ (port-line port))
+ (set-port-column! copycat
+ (port-column port))
+ (if (char=? (peek-char port) #\@)
+ (read-char copycat))
+ (read copycat))))
+ ;; kill unused lookahead, it has been
+ ;; written out already
+ (drain-input copycat)
+ ;; only put symbols and non-quote
+ ;; lists into closures -- constants
+ ;; don't need lexical environments
+ ;; for evaluation.
+ (if (or (symbol? expr)
+ (and (pair? expr)
+ (not (eq? 'quote (car expr)))))
+ (set! closures
+ (cons `(cons ,p (lambda () ,expr))
+ closures)))))))))))
+ (define (embedded-lilypond parser lily-string filename line
+ closures location)
+ (let* ((clone (ly:parser-clone parser closures location))
+ (result (ly:parse-string-expression clone lily-string
+ filename line)))
+ (if (ly:parser-has-error? clone)
+ (ly:parser-error parser (_ "error in #{ ... #}")))
+ result))
+ (list embedded-lilypond
+ 'parser lily-string filename line
+ (cons 'list (reverse! closures))
+ 'location)))
(read-hash-extend #\{ read-lily-expression)