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--2002 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 "text-item.hh"
  13 #include "paper-def.hh"
  14 #include "font-interface.hh"
  15 #include "staff-symbol-referencer.hh"
  16 #include "staff-symbol-referencer.hh"
  17 #include "main.hh"
  18 #include "all-font-metrics.hh"
  19 #include "afm.hh"
  20 #include "lookup.hh"
  21
  22
  23 /*
  24
  25   TEXT: STRING
  26         | (MARKUP? TEXT+)
  27         ;
  28
  29   HEAD: MARKUP-ITEM | (MARKUP-ITEM+)
  30
  31   MARKUP-ITEM: PROPERTY | ABBREV | FONT-STYLE
  32   PROPERTY: (key . value)
  33   ABBREV: rows lines roman music bold italic named super sub text
  34
  35 */
  36
  37 Molecule
  38 Text_item::text2molecule (Grob *me, SCM text, SCM alist_chain)
  39 {
  40   if (gh_string_p (text))
  41     return string2molecule (me, text, alist_chain);
  42   else if (gh_pair_p (text))
  43     {
  44       /* urg, why not just do  this in markup_text2molecule ? */
  45       if (gh_string_p (ly_car (text)))
  46         return markup_text2molecule (me,
  47                                      gh_append2 (scm_list_n (SCM_EOL,
  48                                                          SCM_UNDEFINED),
  49                                                  text),
  50                                      alist_chain);
  51       /*
  52         Allow (faulty) texts that are in an extra list:
  53         #'(("foo"))
  54        */
  55       else if (scm_ilength (text) <= 1)
  56         return text2molecule (me, ly_car (text), alist_chain);
  57       else
  58         return markup_text2molecule (me, text, alist_chain);
  59     }
  60   return Molecule ();
  61 }
  62
  63 Molecule
  64 Text_item::string2molecule (Grob *me, SCM text, SCM alist_chain)
  65 {
  66   SCM style = ly_assoc_chain (ly_symbol2scm ("font-style"),
  67                               alist_chain);
  68   if (gh_pair_p (style) && gh_symbol_p (ly_cdr (style)))
  69     alist_chain = Font_interface::add_style (me, ly_cdr (style), alist_chain);
  70
  71   Font_metric *fm = Font_interface::get_font (me, alist_chain);
  72
  73   SCM lookup = ly_assoc_chain (ly_symbol2scm ("lookup"), alist_chain);
  74
  75   Molecule mol;
  76   if (gh_pair_p (lookup) && ly_cdr (lookup) ==ly_symbol2scm ("name"))
  77     mol = lookup_character (me, fm, text);
  78   else
  79     mol = lookup_text (me, fm, text);
  80
  81   return mol;
  82 }
  83
  84 Molecule
  85 Text_item::lookup_character (Grob *, Font_metric*fm, SCM char_name)
  86 {
  87   return fm->find_by_name (ly_scm2string (char_name));
  88 }
  89
  90
  91 Molecule
  92 Text_item::lookup_text (Grob *, Font_metric*fm, SCM text)
  93 {
  94   SCM list = scm_list_n (ly_symbol2scm ("text"), text, SCM_UNDEFINED);
  95   list = fontify_atom (fm, list);
  96
  97   return Molecule (fm->text_dimension (ly_scm2string (text)), list);
  98 }
  99
 100
 101 /*
 102   TODO:
 103
 104   DOCME.
 105
 106
 107   MARKUP_TEXT must be compound (may not be simple string.)
 108
 109  */
 110 Molecule
 111 Text_item::markup_text2molecule (Grob *me, SCM markup_text,
 112                                  SCM alist_chain)
 113 {
 114   SCM sheet = me->get_paper ()->style_sheet_;
 115   SCM f = ly_cdr (scm_assoc (ly_symbol2scm ("markup-to-properties"), sheet));
 116
 117   SCM markup = ly_car (markup_text);
 118   SCM text = ly_cdr (markup_text);
 119
 120   SCM p = gh_cons (gh_call2 (f, sheet, markup), alist_chain);
 121
 122   Real staff_space = Staff_symbol_referencer::staff_space (me);
 123
 124   /*
 125     Line mode is default.
 126    */
 127   Axis axis = X_AXIS;
 128
 129   SCM a = ly_assoc_chain (ly_symbol2scm ("axis"), p);
 130   if (gh_pair_p (a) && ly_axis_p (ly_cdr (a)))
 131     axis = (Axis)gh_scm2int (ly_cdr (a));
 132
 133   Real baseline_skip = 0;
 134   SCM b = ly_assoc_chain (ly_symbol2scm ("baseline-skip"), p);
 135   if (gh_pair_p (b) && gh_number_p (ly_cdr (b)))
 136     baseline_skip = gh_scm2double (ly_cdr (b)) * staff_space;
 137
 138   Real kern[2] = {0,0};
 139
 140   SCM k = ly_assoc_chain (ly_symbol2scm ("kern"), p);
 141   if (gh_pair_p (k) && gh_number_p (ly_cdr (k)))
 142     kern[axis] = gh_scm2double (ly_cdr (k)) * staff_space;
 143
 144   Real raise = 0;
 145   SCM r = ly_assoc_chain (ly_symbol2scm ("raise"), p);
 146   if (gh_pair_p (r) && gh_number_p (ly_cdr (r)))
 147     raise = gh_scm2double (ly_cdr (r)) * staff_space;
 148
 149
 150   Interval extent;
 151   bool extent_b = false;
 152   SCM e = ly_assoc_chain (ly_symbol2scm ("extent"), p);
 153   if (gh_pair_p (e) && ly_number_pair_p (ly_cdr (e)))
 154     {
 155       extent = Interval (gh_scm2double (ly_cadr (e)) * staff_space,
 156                        gh_scm2double (ly_cddr (e)) * staff_space);
 157       extent_b = true;
 158     }
 159
 160   Offset o (kern[X_AXIS], raise - kern[Y_AXIS]);
 161
 162   Molecule mol = Lookup::filledbox (Box (Interval (0,0), Interval (0,0)));
 163
 164   SCM cp = ly_deep_copy (p);
 165   if (raise)
 166     {
 167       SCM cr = ly_assoc_chain (ly_symbol2scm ("raise"), cp);
 168       scm_set_cdr_x (cr, gh_int2scm (0));
 169     }
 170
 171   while (gh_pair_p (text))
 172     {
 173       Molecule m = text2molecule (me, ly_car (text), cp);
 174
 175       if (!m.empty_b ())
 176         {
 177           m.translate_axis (mol.extent (axis)[axis == X_AXIS ? RIGHT : DOWN]
 178                             - (axis == Y_AXIS ? baseline_skip : 0),
 179                             axis);
 180           mol.add_molecule (m);
 181         }
 182       text = ly_cdr (text);
 183     }
 184
 185
 186   /* Set extend to markup requested value. */
 187   if (extent_b)
 188     {
 189       Box b = mol.extent_box ();
 190       SCM expr = mol.get_expr ();
 191
 192       b[axis] = extent;
 193       mol = Molecule (b, expr);
 194     }
 195
 196   mol.translate (o);
 197
 198   return mol;
 199 }
 200
 201 MAKE_SCHEME_CALLBACK (Text_item, brew_molecule, 1);
 202 SCM
 203 Text_item::brew_molecule (SCM smob)
 204 {
 205   Grob *me = unsmob_grob (smob);
 206
 207   SCM text = me->get_grob_property ("text");
 208
 209   SCM properties = Font_interface::font_alist_chain (me);
 210   Molecule mol = Text_item::text2molecule (me, text, properties);
 211
 212   SCM space = me->get_grob_property ("word-space");
 213   if (gh_number_p (space))
 214     {
 215       Molecule m;
 216       m.set_empty (false);
 217       mol.add_at_edge (X_AXIS, RIGHT, m, gh_scm2double (space)
 218                        * Staff_symbol_referencer::staff_space (me));
 219     }
 220   return mol.smobbed_copy ();
 221 }
 222
 223
 224
 225 ADD_INTERFACE (Text_item,"text-interface",
 226   "A scheme markup text",
 227   "text align baseline-skip lookup raise kern word-space magnify");