lily/text-item.cc

   1 /*
   2   text-item.cc -- implement Text_item
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7   Jan Nieuwenhuizen <janneke@gnu.org>
   8  */
   9 #include <math.h>
  10
  11 #include "warn.hh"
  12 #include "grob.hh"
  13 #include "text-item.hh"
  14 #include "font-interface.hh"
  15 #include "virtual-font-metric.hh"
  16 #include "paper-def.hh"
  17
  18 MAKE_SCHEME_CALLBACK(Text_item,interpret_markup,3);
  19 SCM
  20 Text_item::interpret_markup (SCM paper, SCM props, SCM markup)
  21 {
  22   if (gh_string_p (markup))
  23     {
  24       Paper_def *pap = unsmob_paper (paper);
  25       Font_metric *fm = select_font (pap, props);
  26
  27       SCM list = scm_list_n (ly_symbol2scm ("text"), markup, SCM_UNDEFINED);
  28
  29       if (dynamic_cast<Virtual_font_metric*> (fm))
  30         {
  31           /*
  32             ARGH.
  33           */
  34           programming_error ("Can't use virtual font for text.");
  35         }
  36       else
  37         list = fontify_atom (fm, list);
  38
  39       Box b = fm->text_dimension (ly_scm2string (markup));
  40       return Molecule (b, list).smobbed_copy();
  41     }
  42   else if (gh_pair_p (markup))
  43     {
  44       SCM func = gh_car (markup);
  45       SCM args = gh_cdr (markup);
  46       if (!markup_p (markup))
  47         programming_error ("Markup head has no markup signature.");
  48
  49       return scm_apply_2 (func, paper, props, args);
  50     }
  51   else
  52     {
  53       return SCM_EOL;
  54     }
  55 }
  56
  57 MAKE_SCHEME_CALLBACK(Text_item,brew_molecule,1);
  58 SCM
  59 Text_item::brew_molecule (SCM grob)
  60 {
  61   Grob * me = unsmob_grob (grob);
  62
  63   SCM t = me->get_grob_property ("text");
  64   SCM chain = Font_interface::font_alist_chain (me);
  65   return interpret_markup (me->get_paper ()->self_scm (), chain, t);
  66 }
  67
  68
  69 /*
  70   Ugh. Duplicated from Scheme.
  71  */
  72 bool
  73 Text_item::markup_p (SCM x)
  74 {
  75   return
  76     gh_string_p (x) ||
  77     (gh_pair_p (x)
  78      && SCM_BOOL_F != scm_object_property (gh_car (x), ly_symbol2scm ("markup-signature")));
  79 }
  80
  81 ADD_INTERFACE (Text_item,"text-interface",
  82   "A scheme markup text, see @ref{Markup functions}.",
  83   "text baseline-skip word-space");
  84
  85
  86
  87