source file of the GNU LilyPond music typesetter
- (c) 2004 Jan Nieuwenhuizen <janneke@gnu.org>
+ (c) 2004--2005 Jan Nieuwenhuizen <janneke@gnu.org>
*/
-#include <stdio.h>
-#include <math.h>
+#include "paper-book.hh"
-#include "ly-module.hh"
#include "main.hh"
-#include "paper-book.hh"
-#include "paper-def.hh"
-#include "paper-outputter.hh"
+#include "output-def.hh"
#include "paper-score.hh"
-#include "stencil.hh"
+#include "paper-system.hh"
+#include "text-item.hh"
+#include "warn.hh"
-static Real const MIN_COVERAGE = 0.66;
-static Real const MAX_CRAMP = 0.05;
+#include "ly-smobs.icc"
-static SCM
-stencil2line (Stencil* stil)
+Paper_book::Paper_book ()
{
- static SCM z = ly_offset2scm (Offset (0, 0));
- Offset dim = Offset (stil->extent (X_AXIS).length (),
- stil->extent (Y_AXIS).length ());
- return scm_cons (ly_offset2scm (dim),
- scm_list_1 (scm_cons (z, stil->smobbed_copy ())));
+ header_ = SCM_EOL;
+ pages_ = SCM_BOOL_F;
+ scores_ = SCM_EOL;
+ systems_ = SCM_BOOL_F;
+
+ paper_ = 0;
+ smobify_self ();
}
-static SCM
-title2line (Stencil* stil)
+Paper_book::~Paper_book ()
{
- SCM s = stencil2line (stil);
- /* whugh, add marker recognise titles. */
- return scm_cons (scm_cons (ly_symbol2scm ("title"), ly_car (s)), ly_cdr (s));
}
-/* Simplistic page interface */
-class Page
-{
-public:
- Paper_def *paper_;
- static int page_count_;
- int number_;
- int line_count_;
-
- Protected_scm lines_;
- Protected_scm header_;
- Protected_scm footer_;
- Protected_scm copyright_;
- Protected_scm tagline_;
-
- Stencil *get_header () { return unsmob_stencil (header_); }
- Stencil *get_copyright () { return unsmob_stencil (copyright_); }
- Stencil *get_tagline () { return unsmob_stencil (tagline_); }
- Stencil *get_footer () { return unsmob_stencil (footer_); }
+IMPLEMENT_DEFAULT_EQUAL_P (Paper_book);
+IMPLEMENT_SMOBS (Paper_book)
+IMPLEMENT_TYPE_P (Paper_book, "ly:paper-book?")
- /* actual height filled with text. */
- Real height_;
-
- // HMMM all this size stuff to paper/paper-outputter?
- Real hsize_;
- Real vsize_;
- Real left_margin_;
- Real top_margin_;
- Real bottom_margin_;
- Real foot_sep_;
- Real head_sep_;
- Real text_width_;
-
- /* available area for text. */
- Real text_height ();
-
- Page (Paper_def*, int);
- void output (Paper_outputter*, bool);
-};
-
-int Page::page_count_ = 0;
-
-Page::Page (Paper_def *paper, int number)
+SCM
+Paper_book::mark_smob (SCM smob)
{
- paper_ = paper;
- number_ = number;
- page_count_++;
-
- height_ = 0;
- lines_ = SCM_EOL;
- line_count_ = 0;
-
- hsize_ = paper->get_realvar (ly_symbol2scm ("hsize"));
- vsize_ = paper->get_realvar (ly_symbol2scm ("vsize"));
- top_margin_ = paper->get_realvar (ly_symbol2scm ("top-margin"));
- bottom_margin_ = paper->get_realvar (ly_symbol2scm ("bottom-margin"));
- head_sep_ = paper->get_realvar (ly_symbol2scm ("head-sep"));
- foot_sep_ = paper->get_realvar (ly_symbol2scm ("foot-sep"));
- text_width_ = paper->get_realvar (ly_symbol2scm ("linewidth"));
- left_margin_ = (hsize_ - text_width_) / 2;
-
- copyright_ = SCM_EOL;
- tagline_ = SCM_EOL;
-
- SCM make_header = scm_primitive_eval (ly_symbol2scm ("make-header"));
- SCM make_footer = scm_primitive_eval (ly_symbol2scm ("make-footer"));
-
- header_ = scm_call_2 (make_header, paper_->smobbed_copy (),
- scm_int2num (number_));
- // FIXME: why does this (generates Stencil) not trigger font load?
- if (get_header ())
- get_header ()->align_to (Y_AXIS, UP);
-
- footer_ = scm_call_2 (make_footer, paper_->smobbed_copy (),
- scm_int2num (number_));
- if (get_footer ())
- get_footer ()->align_to (Y_AXIS, UP);
+ Paper_book *b = (Paper_book*) SCM_CELL_WORD_1 (smob);
+ if (b->paper_)
+ scm_gc_mark (b->paper_->self_scm ());
+ scm_gc_mark (b->header_);
+ scm_gc_mark (b->pages_);
+ scm_gc_mark (b->scores_);
+ return b->systems_;
}
-void
-Page::output (Paper_outputter *out, bool is_last)
+int
+Paper_book::print_smob (SCM smob, SCM port, scm_print_state*)
{
- progress_indication ("[" + to_string (number_));
- out->output_scheme (scm_list_1 (ly_symbol2scm ("start-page")));
- Offset o (left_margin_, top_margin_);
- Real vfill = line_count_ > 1 ? (text_height () - height_) / (line_count_ - 1)
- : 0;
-
- Real coverage = height_ / text_height ();
- if (coverage < MIN_COVERAGE)
- /* Do not space out a badly filled page. This is too simplistic
- (ie broken), because this should not vary too much between
- (subsequent?) pages in a book. */
- vfill = 0;
-
- if (get_header ())
- {
- out->output_line (stencil2line (get_header ()), &o, false);
- o[Y_AXIS] += head_sep_;
- }
- for (SCM s = lines_; gh_pair_p (s); s = ly_cdr (s))
- {
- SCM line = ly_car (s);
- SCM offset = ly_car (line);
- if (ly_car (offset) == ly_symbol2scm ("title"))
- line = scm_cons (ly_cdr (offset), ly_cdr (line));
- out->output_line (line, &o,
- is_last && gh_pair_p (ly_cdr (s)) && !get_copyright ()
- && !get_tagline () && !get_footer ());
- if (gh_pair_p (ly_cdr (s)) && ly_car (offset) != ly_symbol2scm ("title"))
- o[Y_AXIS] += vfill;
- }
-
-#if 0
- if (get_copyright () || get_tagline () || get_footer ())
- o[Y_AXIS] += foot_sep_;
-#else
- o[Y_AXIS] = vsize_ - bottom_margin_;
- if (get_copyright ())
- o[Y_AXIS] -= get_copyright ()->extent (Y_AXIS).length ();
- if (get_tagline ())
- o[Y_AXIS] -= get_tagline ()->extent (Y_AXIS).length ();
- if (get_footer ())
- o[Y_AXIS] -= get_footer ()->extent (Y_AXIS).length ();
-#endif
-
- if (get_copyright ())
- out->output_line (stencil2line (get_copyright ()), &o,
- is_last && !get_tagline () && !get_footer ());
- if (get_tagline ())
- out->output_line (stencil2line (get_tagline ()), &o,
- is_last && !get_footer ());
- if (get_footer ())
- out->output_line (stencil2line (get_footer ()), &o, is_last);
- out->output_scheme (scm_list_2 (ly_symbol2scm ("stop-page"),
- gh_bool2scm (is_last && !get_footer ())));
- progress_indication ("]");
+ Paper_book *b = (Paper_book*) SCM_CELL_WORD_1 (smob);
+
+ scm_puts ("#<", port);
+ scm_puts (classname (b), port);
+ scm_puts (" ", port);
+ scm_puts (">", port);
+ return 1;
}
-Real
-Page::text_height ()
+SCM
+dump_fields ()
{
- Real h = vsize_ - top_margin_ - bottom_margin_;
- if (get_header ())
- h -= get_header ()->extent (Y_AXIS).length () + head_sep_;
- if (get_copyright () || get_tagline () || get_footer ())
- h -= foot_sep_;
- if (get_copyright ())
- h -= get_copyright ()->extent (Y_AXIS).length ();
- if (get_tagline ())
- h -= get_tagline ()->extent (Y_AXIS).length ();
- if (get_footer ())
- h -= get_footer ()->extent (Y_AXIS).length ();
- return h;
+ SCM fields = SCM_EOL;
+ for (int i = dump_header_fieldnames_global.size (); i--; )
+ fields
+ = scm_cons (ly_symbol2scm (dump_header_fieldnames_global[i].to_str0 ()),
+ fields);
+ return fields;
}
-/****************************************************************/
-
-/* Current global paper book. Gives default_rendering access from
- input-file-results. */
-Paper_book *paper_book;
-
-Paper_book::Paper_book ()
+void
+Paper_book::add_score (SCM s)
{
- smobify_self ();
+ scores_ = scm_cons (s, scores_);
}
-Paper_book::~Paper_book ()
+void
+Paper_book::output (String outname)
{
+ if (scores_ == SCM_EOL)
+ return;
+
+ /* Generate all stencils to trigger font loads. */
+ pages ();
+
+ SCM scopes = SCM_EOL;
+ if (ly_c_module_p (header_))
+ scopes = scm_cons (header_, scopes);
+
+ String mod_nm = "scm framework-" + output_backend_global;
+
+ SCM mod = scm_c_resolve_module (mod_nm.to_str0 ());
+ if (make_pages)
+ {
+ SCM func = scm_c_module_lookup (mod, "output-framework");
+
+ func = scm_variable_ref (func);
+ scm_apply_0 (func, scm_list_n (scm_makfrom0str (outname.to_str0 ()),
+ self_scm (),
+ scopes,
+ dump_fields (),
+ SCM_UNDEFINED));
+ }
+
+ if (make_preview)
+ {
+ SCM func = scm_c_module_lookup (mod, "output-preview-framework");
+ func = scm_variable_ref (func);
+ scm_apply_0 (func, scm_list_n (scm_makfrom0str (outname.to_str0 ()),
+ self_scm (),
+ scopes,
+ dump_fields (),
+ SCM_UNDEFINED));
+ }
+ progress_indication ("\n");
}
void
-Paper_book::output (String outname)
+Paper_book::classic_output (String outname)
{
- if (!papers_.size ())
- return;
-
/* Generate all stencils to trigger font loads. */
- Link_array<Page> *pages = get_pages ();
+ systems ();
- Paper_def *paper = papers_[0];
- Paper_outputter *out = paper->get_paper_outputter (outname);
- out->output_header (paper, get_scopes (0), pages->size ());
+ // ugh code dup
+ SCM scopes = SCM_EOL;
+ if (ly_c_module_p (header_))
+ scopes = scm_cons (header_, scopes);
- int page_count = pages->size ();
- for (int i = 0; i < page_count; i++)
- (*pages)[i]->output (out, i + 1 == page_count);
+#if 0
+ if (ly_c_module_p (scores_[0].header_))
+ scopes = scm_cons (scores_[0].header_, scopes);
+#endif
+ //end ugh
+
+ String format = output_backend_global;
+ String mod_nm = "scm framework-" + format;
+
+ SCM mod = scm_c_resolve_module (mod_nm.to_str0 ());
+ SCM func = scm_c_module_lookup (mod, "output-classic-framework");
+
+
+ func = scm_variable_ref (func);
+ scm_apply_0 (func, scm_list_n (scm_makfrom0str (outname.to_str0 ()),
+ self_scm (),
+ scopes,
+ dump_fields (),
+ SCM_UNDEFINED));
- out->output_scheme (scm_list_1 (ly_symbol2scm ("end-output")));
progress_indication ("\n");
}
-SCM
-Paper_book::get_scopes (int i)
+
+/* TODO: resurrect more complex user-tweaks for titling? */
+Stencil
+Paper_book::book_title ()
{
+ SCM title_func = paper_->lookup_variable (ly_symbol2scm ("book-title"));
+ Stencil title;
+
SCM scopes = SCM_EOL;
- if (headers_[i])
- scopes = scm_cons (headers_[i], scopes);
- if (global_headers_[i] && global_headers_[i] != headers_[i])
- scopes = scm_cons (global_headers_[i], scopes);
- return scopes;
-}
+ if (ly_c_module_p (header_))
+ scopes = scm_cons (header_, scopes);
-Stencil*
-Paper_book::get_title (int i)
-{
- SCM user_title = scm_primitive_eval (ly_symbol2scm ("user-title"));
- SCM book_title = scm_primitive_eval (ly_symbol2scm ("book-title"));
- SCM score_title = scm_primitive_eval (ly_symbol2scm ("score-title"));
- SCM field = (i == 0 ? ly_symbol2scm ("bookTitle")
- : ly_symbol2scm ("scoreTitle"));
-
- Stencil *title = 0;
- SCM scopes = get_scopes (i);
- SCM s = ly_modules_lookup (scopes, field);
- if (s != SCM_UNDEFINED && scm_variable_bound_p (s) == SCM_BOOL_T)
- title = unsmob_stencil (scm_call_2 (user_title,
- papers_[0]->self_scm (),
- scm_variable_ref (s)));
- else
- title = unsmob_stencil (scm_call_2 (i == 0 ? book_title : score_title,
- papers_[0]->self_scm (),
- scopes));
- if (title)
- title->align_to (Y_AXIS, UP);
+
+ SCM tit = SCM_EOL;
+ if (ly_c_procedure_p (title_func))
+ tit = scm_call_2 (title_func,
+ paper_->self_scm (),
+ scopes);
+
+ if (unsmob_stencil (tit))
+ title = *unsmob_stencil (tit);
+
+ if (!title.is_empty ())
+ title.align_to (Y_AXIS, UP);
return title;
}
-/* calculate book height, #lines, stencils. */
-void
-Paper_book::init ()
+Stencil
+Paper_book::score_title (SCM header)
{
- int score_count = scores_.size ();
+ SCM title_func = paper_->lookup_variable (ly_symbol2scm ("score-title"));
- /* Calculate the full book height. Hmm, can't we cache system
- heights while making stencils? */
- height_ = 0;
- for (int i = 0; i < score_count; i++)
- {
- Stencil *title = get_title (i);
- if (title)
- height_ += title->extent (Y_AXIS).length ();
+ Stencil title;
- int line_count = SCM_VECTOR_LENGTH ((SCM) scores_[i]);
- for (int j = 0; j < line_count; j++)
- {
- SCM line = scm_vector_ref ((SCM) scores_[i], scm_int2num (j));
- height_ += ly_scm2offset (ly_car (line))[Y_AXIS];
- }
- }
+ SCM scopes = SCM_EOL;
+ if (ly_c_module_p (header_))
+ scopes = scm_cons (header_, scopes);
+
+ if (ly_c_module_p (header))
+ scopes = scm_cons (header, scopes);
- Paper_def *paper = papers_[0];
- SCM scopes = get_scopes (0);
-
- SCM make_tagline = scm_primitive_eval (ly_symbol2scm ("make-tagline"));
- tagline_ = scm_call_2 (make_tagline, paper->smobbed_copy (), scopes);
- Real tag_height = 0;
- if (Stencil *s = unsmob_stencil (tagline_))
- tag_height = s->extent (Y_AXIS).length ();
- height_ += tag_height;
-
- SCM make_copyright = scm_primitive_eval (ly_symbol2scm ("make-copyright"));
- copyright_ = scm_call_2 (make_copyright, paper->smobbed_copy (), scopes);
- Real copy_height = 0;
- if (Stencil *s = unsmob_stencil (copyright_))
- copy_height = s->extent (Y_AXIS).length ();
- height_ += copy_height;
+ SCM tit = SCM_EOL;
+ if (ly_c_procedure_p (title_func))
+ tit = scm_call_2 (title_func,
+ paper_->self_scm (),
+ scopes);
+
+ if (unsmob_stencil (tit))
+ title = *unsmob_stencil (tit);
+
+ if (!title.is_empty ())
+ title.align_to (Y_AXIS, UP);
+
+ return title;
}
-/* Ideas:
- - real page breaking algorithm (Gourlay?)
- Hmmughr, Gourlay uses Grobs, columns etc -- looks like it needs serious
- refactoring before it can be applied to Page breaking...
- - override: # pages, or pageBreakLines= #'(3 3 4), ? */
-Link_array<Page>*
-Paper_book::get_pages ()
+void
+set_system_penalty (Paper_system * ps, SCM header)
{
- init ();
- Page::page_count_ = 0;
- Paper_def *paper = papers_[0];
- Page *page = new Page (paper, 1);
-
- Real text_height = page->text_height ();
- Real page_frac = height_ / text_height;
- int page_count = (int) ceil (page_frac);
- if (unsmob_stencil (copyright_))
- page->copyright_ = copyright_;
- if (unsmob_stencil (tagline_) && page_count == 1)
- page->tagline_ = tagline_;
-
- /* Attempt to fill pages better using FUDGE kludge. */
- Real r = page_frac - (int) page_frac;
- Real cramp_fudge = page_count > 1 ? (r / (page_count - 1)) * text_height : 0;
- Real expand_fudge = - ((1 - r) / page_count) * text_height;
-
- Link_array<Page>* pages = 0;
- if ((page_count > 1 && (r / (page_count - 1)) < MAX_CRAMP))
- {
- /* Just a little more space (<MAX_CRAMP) per page is needed,
- cramp onto one page less. */
- pages = fill_pages (page, page_count - 1, cramp_fudge);
- if (pages->size () != page_count - 1)
- {
- /* Cramping failed. */
- page = pages->get (0);
- delete pages;
- pages = 0;
- }
- }
- if (!pages && ((1 - r) / page_count) < 1 - MIN_COVERAGE)
+ if (ly_c_module_p (header))
{
- /* There is space left, but not so much that paged would have too
- little blackness (< MIN_COVERAGE), distribute evenly. */
- pages = fill_pages (page, page_count, expand_fudge);
- bool badly_covered = false;
- if (pages->size () == page_count)
- for (int i = 0; i < page_count; i++)
- {
- Page *p = (*pages)[i];
- Real coverage = p ->height_ / p->text_height ();
- if (coverage < MIN_COVERAGE)
- {
- badly_covered = true;
- break;
- }
- }
- if (pages->size () != page_count || badly_covered)
+ SCM force = ly_module_lookup (header, ly_symbol2scm ("breakbefore"));
+ if (SCM_VARIABLEP(force)
+ && scm_is_bool (SCM_VARIABLE_REF(force)))
{
- /* expanding failed. */
- page = pages->get (0);
- delete pages;
- pages = 0;
+ ps->break_before_penalty_ = to_boolean (SCM_VARIABLE_REF(force))
+ ? -10000
+ : 10000;
}
}
-
- if (!pages)
- /* Fudging failed; just fill pages. */
- pages = fill_pages (page, page_count, 0);
- return pages;
}
-
-/* Simplistic page breaking:
- add lines until HEIGHT > PAGE.TEXT_HEIGHT_ + FUDGE */
-Link_array<Page>*
-Paper_book::fill_pages (Page *page, int page_count, Real fudge)
+
+SCM
+Paper_book::systems ()
{
- int page_number = 1;
- int score_count = scores_.size ();
- Paper_def *paper = papers_[0];
- Link_array<Page> *pages = new Link_array<Page>;
- page->lines_ = SCM_EOL;
- page->height_ = 0;
- page->line_count_ = 0;
- Real text_height = page->text_height ();
- for (int i = 0; i < score_count; i++)
+ if (systems_ != SCM_BOOL_F)
+ return systems_;
+
+ systems_ = SCM_EOL;
+ Stencil title = book_title ();
+
+ if (!title.is_empty ())
{
- Real h = 0;
- Stencil *title = get_title (i);
- if (title)
- h = title->extent (Y_AXIS).length ();
+ Paper_system *ps = new Paper_system (title, true);
+ set_system_penalty (ps, header_);
+
+ systems_ = scm_cons (ps->self_scm (), systems_);
+ scm_gc_unprotect_object (ps->self_scm ());
+ }
- int line_count = SCM_VECTOR_LENGTH ((SCM) scores_[i]);
- for (int j = 0; j < line_count; j++)
+ SCM page_properties
+ = scm_call_1 (ly_lily_module_constant ("layout-extract-page-properties"),
+ paper_->self_scm ());
+
+ SCM header = SCM_EOL;
+ for (SCM s = scm_reverse (scores_); s != SCM_EOL; s = scm_cdr (s))
+ {
+ if (ly_c_module_p (scm_car (s)))
+ header = scm_car (s);
+ else if (scm_is_vector (scm_car (s)))
{
- SCM line = scm_vector_ref ((SCM) scores_[i], scm_int2num (j));
- h += ly_scm2offset (ly_car (line))[Y_AXIS];
- Real fill = (page->height_ - text_height) / text_height;
- // Real fill_h = (page->height_ + h - text_height) / text_height;
- Real fudged_fill = (page->height_ - (text_height + fudge))
- / (text_height + fudge);
- Real fudged_fill_h = ((page->height_ + h) - (text_height + fudge))
- / (text_height + fudge);
- if (fill > -MAX_CRAMP
- || (fudged_fill > -MAX_CRAMP
- && (fudge < 0
- || !(fudged_fill_h > 0
- && abs (fudged_fill_h) < 4 * abs (fudged_fill)))))
+ Stencil title = score_title (header);
+ if (!title.is_empty ())
{
- pages->push (page);
- page = new Page (paper, ++page_number);
- if (unsmob_stencil (tagline_) && page_number == page_count)
- page->tagline_ = tagline_;
- text_height = page->text_height ();
+ Paper_system *ps = new Paper_system (title, true);
+ systems_ = scm_cons (ps->self_scm (), systems_);
+ scm_gc_unprotect_object (ps->self_scm ());
+ set_system_penalty (ps, header);
}
- if (j == 0 && title)
- page->lines_ = ly_snoc (title2line (title), page->lines_);
- page->lines_ = ly_snoc (line, page->lines_);
- page->line_count_++;
- page->height_ += h;
- h = 0;
+ header = SCM_EOL;
+
+ SCM system_list = scm_vector_to_list (scm_car (s));
+ system_list = scm_reverse (system_list);
+ systems_ = scm_append (scm_list_2 (system_list, systems_));
+ }
+ else if (Text_interface::markup_p (scm_car (s)))
+ {
+ SCM t = Text_interface::interpret_markup (paper_->self_scm (),
+ page_properties,
+ scm_car (s));
+ // FIXME: title=true?
+ Paper_system *ps = new Paper_system (*unsmob_stencil (t), true);
+ systems_ = scm_cons (ps->self_scm (), systems_);
+ scm_gc_unprotect_object (ps->self_scm ());
+ // FIXME: figure out penalty.
+ //set_system_penalty (ps, scores_[i].header_);
}
+ else
+ assert (0);
}
-
- pages->push (page);
- return pages;
-}
-
-void
-Paper_book::classic_output (String outname)
-{
- int count = scores_.size ();
- Paper_outputter *out = papers_.top ()->get_paper_outputter (outname);
- out->output_header (papers_.top (), get_scopes (count - 1), 0);
-
- int line_count = SCM_VECTOR_LENGTH ((SCM) scores_.top ());
- for (int i = 0; i < line_count; i++)
- out->output_line (scm_vector_ref ((SCM) scores_.top (), scm_int2num (i)),
- 0, i == line_count - 1);
- out->output_scheme (scm_list_1 (ly_symbol2scm ("end-output")));
- progress_indication ("\n");
+ systems_ = scm_reverse (systems_);
+
+ int i = 0;
+ Paper_system *last = 0;
+ for (SCM s = systems_; s != SCM_EOL; s = scm_cdr (s))
+ {
+ Paper_system *ps = unsmob_paper_system (scm_car (s));
+ ps->number_ = ++i;
+
+ if (last
+ && last->is_title ()
+ && !ps->break_before_penalty_)
+ ps->break_before_penalty_ = 10000;
+ last = ps;
+ }
+
+ return systems_;
}
-
-#include "ly-smobs.icc"
-
-IMPLEMENT_DEFAULT_EQUAL_P (Paper_book);
-IMPLEMENT_SMOBS (Paper_book)
-IMPLEMENT_TYPE_P (Paper_book, "ly:paper-book?")
-
SCM
-Paper_book::mark_smob (SCM smob)
+Paper_book::pages ()
{
- Paper_book *pb = (Paper_book*) SCM_CELL_WORD_1 (smob);
- for (int i = 0; i < pb->headers_.size (); i++)
- scm_gc_mark (pb->headers_[i]);
- for (int i = 0; i < pb->global_headers_.size (); i++)
- scm_gc_mark (pb->global_headers_[i]);
- for (int i = 0; i < pb->papers_.size (); i++)
- scm_gc_mark (pb->papers_[i]->self_scm ());
- for (int i = 0; i < pb->scores_.size (); i++)
- scm_gc_mark (pb->scores_[i]);
- return SCM_EOL;
-}
+ if (SCM_BOOL_F != pages_)
+ return pages_;
-int
-Paper_book::print_smob (SCM smob, SCM port, scm_print_state*)
-{
- Paper_book *b = (Paper_book*) ly_cdr (smob);
-
- scm_puts ("#<", port);
- scm_puts (classname (b), port);
- scm_puts (" ", port);
- //scm_puts (b->, port);
- scm_puts (">", port);
- return 1;
+ pages_ = SCM_EOL;
+ SCM proc = paper_->c_variable ("page-breaking");
+ pages_ = scm_apply_0 (proc, scm_list_2 (systems (), self_scm ()));
+ return pages_;
}