/*
- stencil-scheme.cc -- implement Stencil
+ stencil-scheme.cc -- implement Stencil scheme accessors
source file of the GNU LilyPond music typesetter
- (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
*/
-#include "stencil.hh"
+
#include "font-metric.hh"
+#include "libc-extension.hh"
+#include "lookup.hh"
+#include "stencil.hh"
-LY_DEFINE(ly_stencil_set_extent_x,"ly:stencil-set-extent!", 3 , 0, 0,
- (SCM mol, SCM axis, SCM np),
- "Set the extent (@var{extent} must be a pair of numbers) of @var{mol} in \n"
-"@var{axis} direction (0 or 1 for x- and y-axis respectively).\n"
-"\n"
-"Note that an extent @code{(A . B)} is an interval and hence @code{A} is\n"
-"smaller than @code{B}, and is often negative.\n"
-)
-{
- Stencil* m = unsmob_stencil (mol);
- SCM_ASSERT_TYPE (m, mol, SCM_ARG1, __FUNCTION__, "stencil");
- SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG2, __FUNCTION__, "axis");
- SCM_ASSERT_TYPE (is_number_pair (np), np, SCM_ARG3, __FUNCTION__, "number pair");
+/*
+ TODO: naming add/combine.
+*/
- Interval iv = ly_scm2interval (np);
- m->dim_[Axis (gh_scm2int (axis))] = iv;
+LY_DEFINE (ly_translate_stencil_axis, "ly:stencil-translate-axis",
+ 3, 0, 0, (SCM stil, SCM amount, SCM axis),
+ "Return a copy of @var{stil} but translated by @var{amount} in @var{axis} direction.")
+{
+ Stencil *s = unsmob_stencil (stil);
+ SCM_ASSERT_TYPE (s, stil, SCM_ARG1, __FUNCTION__, "stencil");
+ SCM_ASSERT_TYPE (scm_is_number (amount), amount, SCM_ARG2, __FUNCTION__, "number");
- return SCM_UNDEFINED;
-}
+ Real real_amount = scm_to_double (amount);
+#if 0
+ SCM_ASSERT_TYPE (!isinf (real_amount) && !isnan (real_amount),
+ amount, SCM_ARG2, __FUNCTION__, "finite number");
+#endif
-LY_DEFINE(ly_translate_stencil_axis,"ly:stencil-translate-axis", 3, 0, 0,
- (SCM mol, SCM amount, SCM axis),
- "Return a @var{mol}, but translated by @var{amount} in @var{axis} direction")
-{
- Stencil* m = unsmob_stencil (mol);
- SCM_ASSERT_TYPE (m, mol, SCM_ARG1, __FUNCTION__, "stencil");
- SCM_ASSERT_TYPE (gh_number_p (amount), amount, SCM_ARG2, __FUNCTION__, "number pair");
SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG3, __FUNCTION__, "axis");
-
- Stencil q (*m);
- q.translate_axis (gh_scm2double (amount), Axis (gh_scm2int (axis)));
-
- return q.smobbed_copy();
+ SCM new_s = s->smobbed_copy ();
+ Stencil *q = unsmob_stencil (new_s);
+ q->translate_axis (real_amount, Axis (scm_to_int (axis)));
+ return new_s;
}
-LY_DEFINE(ly_translate_stencil,"ly:stencil-translate", 2, 0, 0,
- (SCM mol, SCM offset),
- "Return a @var{mol}, but translated by @var{offset} (a pair of numbers).")
+LY_DEFINE (ly_translate_stencil, "ly:stencil-translate",
+ 2, 0, 0, (SCM stil, SCM offset),
+ "Return a @var{stil}, "
+ "but translated by @var{offset} (a pair of numbers).")
{
- Stencil* m = unsmob_stencil (mol);
- SCM_ASSERT_TYPE (m, mol, SCM_ARG1, __FUNCTION__, "stencil");
+ Stencil *s = unsmob_stencil (stil);
+ SCM_ASSERT_TYPE (s, stil, SCM_ARG1, __FUNCTION__, "stencil");
SCM_ASSERT_TYPE (is_number_pair (offset), offset, SCM_ARG2, __FUNCTION__, "number pair");
Offset o = ly_scm2offset (offset);
-
- Stencil q (*m);
- q.translate (o);
- return q.smobbed_copy();
+
+ SCM new_s = s->smobbed_copy ();
+ Stencil *q = unsmob_stencil (new_s);
+ q->translate (o);
+ return new_s;
+}
+
+LY_DEFINE (ly_stencil_expr, "ly:stencil-expr",
+ 1, 0, 0, (SCM stil),
+ "Return the expression of @var{stil}.")
+{
+ Stencil *s = unsmob_stencil (stil);
+ SCM_ASSERT_TYPE (s, stil, SCM_ARG1, __FUNCTION__, "stencil");
+ return s->expr ();
}
-LY_DEFINE(ly_stencil_get_extent,
- "ly:stencil-get-extent", 2 , 0, 0, (SCM mol, SCM axis),
- "Return a pair of numbers signifying the extent of @var{mol} in "
-"@var{axis} direction (0 or 1 for x and y axis respectively)."
-)
+LY_DEFINE (ly_stencil_extent, "ly:stencil-extent",
+ 2, 0, 0, (SCM stil, SCM axis),
+ "Return a pair of numbers signifying the extent of @var{stil} in "
+ "@var{axis} direction (0 or 1 for x and y axis respectively).")
{
- Stencil *m = unsmob_stencil (mol);
- SCM_ASSERT_TYPE (m, mol, SCM_ARG1, __FUNCTION__, "stencil");
+ Stencil *s = unsmob_stencil (stil);
+ SCM_ASSERT_TYPE (s, stil, SCM_ARG1, __FUNCTION__, "stencil");
SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG2, __FUNCTION__, "axis");
-
- return ly_interval2scm (m->extent (Axis (gh_scm2int (axis))));
+
+ return ly_interval2scm (s->extent (Axis (scm_to_int (axis))));
}
+LY_DEFINE (ly_stencil_empty_p, "ly:stencil-empty?",
+ 1, 0, 0, (SCM stil),
+ "Return whether @var{stil} is empty ")
+{
+ Stencil *s = unsmob_stencil (stil);
+ SCM_ASSERT_TYPE (s, stil, SCM_ARG1, __FUNCTION__, "stencil");
+ return scm_from_bool (s->is_empty ());
+}
+
+LY_DEFINE (ly_stencil_origin, "ly:stencil-origin",
+ 2, 0, 0, (SCM stil, SCM axis),
+ "Return a pair of numbers signifying the origin @var{stil} in "
+ "@var{axis} direction (0 or 1 for x and y axis respectively).")
+{
+ Stencil *s = unsmob_stencil (stil);
+ SCM_ASSERT_TYPE (s, stil, SCM_ARG1, __FUNCTION__, "stencil");
+ SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG2, __FUNCTION__, "axis");
+
+ return scm_from_double (s->origin ()[Axis (scm_to_int (axis))]);
+}
+
+LY_DEFINE (ly_stencil_moved_to_edge, "ly:stencil-moved-to-edge",
+ 4, 2, 0, (SCM first, SCM axis, SCM direction, SCM second,
+ SCM padding, SCM minimum),
+ "Similar to @code{ly:stencil-combine-edge}, but returns "
+ "@var{second} positioned to be next to @var{first}. ")
+{
+ /*
+ C&P from combine-at-edge.
+ */
+ Stencil *s1 = unsmob_stencil (first);
+ Stencil *s2 = unsmob_stencil (second);
+ Stencil first_stencil;
+
+ SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG3, __FUNCTION__, "axis");
+ SCM_ASSERT_TYPE (is_direction (direction), direction, SCM_ARG4, __FUNCTION__, "dir");
+
+ Real p = 0.0;
+ if (padding != SCM_UNDEFINED)
+ {
+ SCM_ASSERT_TYPE (scm_is_number (padding), padding, SCM_ARG5, __FUNCTION__, "number");
+ p = scm_to_double (padding);
+ }
+ Real m = 0.0;
+ if (minimum != SCM_UNDEFINED)
+ {
+ SCM_ASSERT_TYPE (scm_is_number (minimum), minimum, SCM_ARG6, __FUNCTION__, "number");
+ m = scm_to_double (minimum);
+ }
+
+ if (s1)
+ first_stencil = *s1;
+
+ if (s2)
+ return first_stencil.moved_to_edge (Axis (scm_to_int (axis)),
+ Direction (scm_to_int (direction)),
+ *s2, p, m).smobbed_copy ();
+ else
+ return Stencil ().smobbed_copy ();
+}
-LY_DEFINE(ly_stencil_combined_at_edge,
- "ly:stencil-combine-at-edge",
- 4, 2, 0, (SCM first, SCM axis, SCM direction,
+LY_DEFINE (ly_stencil_combine_at_edge, "ly:stencil-combine-at-edge",
+ 4, 2, 0, (SCM first, SCM axis, SCM direction,
SCM second,
SCM padding,
SCM minimum),
- "Construct a stencil by putting @var{second} next to "
-"@var{first}. @var{axis} can be 0 (x-axis) or 1 (y-axis), @var{direction} can be "
-"-1 (left or down) or 1 (right or up). "
-"The stencils are juxtaposed with @var{padding} as extra space. If "
-"this puts the reference points closer than @var{minimum}, they are moved "
-"by the latter amount.")
-
+ "Construct a stencil by putting @var{second} next to @var{first}. "
+ "@var{axis} can be 0 (x-axis) or 1 (y-axis), "
+ "@var{direction} can be -1 (left or down) or 1 (right or up). "
+ "The stencils are juxtaposed with @var{padding} as extra space. "
+ "If this puts the reference points closer than @var{minimum}, "
+ "they are moved by the latter amount."
+ "@var{first} and @var{second} may also be '() or #f.")
{
- Stencil * m1 = unsmob_stencil (first);
- Stencil * m2 = unsmob_stencil (second);
+ Stencil *s1 = unsmob_stencil (first);
+ Stencil *s2 = unsmob_stencil (second);
Stencil result;
-
- SCM_ASSERT_TYPE(is_axis (axis), axis, SCM_ARG3, __FUNCTION__, "axis");
- SCM_ASSERT_TYPE(is_direction (direction), direction, SCM_ARG4, __FUNCTION__, "dir");
+ SCM_ASSERT_TYPE (s1 || first == SCM_BOOL_F || first == SCM_EOL,
+ first, SCM_ARG1, __FUNCTION__, "Stencil, #f or ()");
+ SCM_ASSERT_TYPE (s2 || second == SCM_BOOL_F || second == SCM_EOL,
+ second, SCM_ARG4, __FUNCTION__, "Stencil, #f or ()");
+ SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG2, __FUNCTION__, "axis");
+ SCM_ASSERT_TYPE (is_direction (direction), direction, SCM_ARG3, __FUNCTION__, "dir");
Real p = 0.0;
if (padding != SCM_UNDEFINED)
{
- SCM_ASSERT_TYPE(gh_number_p (padding), padding, SCM_ARG5, __FUNCTION__, "number");
- p = gh_scm2double (padding);
+ SCM_ASSERT_TYPE (scm_is_number (padding), padding, SCM_ARG5, __FUNCTION__, "number");
+ p = scm_to_double (padding);
}
- Real m =0.0;
+ Real m = 0.0;
if (minimum != SCM_UNDEFINED)
{
- SCM_ASSERT_TYPE(gh_number_p (minimum), minimum, SCM_ARG6, __FUNCTION__, "number");
- m = gh_scm2double (minimum);
+ SCM_ASSERT_TYPE (scm_is_number (minimum), minimum, SCM_ARG6, __FUNCTION__, "number");
+ m = scm_to_double (minimum);
}
-
- if (m1)
- result = *m1;
- if (m2)
- result.add_at_edge (Axis (gh_scm2int (axis)), Direction (gh_scm2int (direction)),
- *m2, p, m);
+
+ if (s1)
+ result = *s1;
+
+ if (s2)
+ result.add_at_edge (Axis (scm_to_int (axis)),
+ Direction (scm_to_int (direction)), *s2, p, m);
return result.smobbed_copy ();
}
-/*
- FIXME: support variable number of arguments.
-
- */
-LY_DEFINE(ly_stencil_add ,
- "ly:stencil-add", 0, 0, 1, (SCM args),
- "Combine stencils. Takes any number of arguments."
- )
+LY_DEFINE (ly_stencil_add, "ly:stencil-add",
+ 0, 0, 1, (SCM args),
+ "Combine stencils. Takes any number of arguments.")
{
#define FUNC_NAME __FUNCTION__
SCM_VALIDATE_REST_ARGUMENT (args);
- Stencil result;
+ SCM expr = SCM_EOL;
+ SCM *tail = &expr;
+ Box extent;
+ extent.set_empty ();
while (!SCM_NULLP (args))
{
- Stencil * m = unsmob_stencil (gh_car (args));
+ Stencil *s = unsmob_stencil (scm_car (args));
+ if (!s)
+ SCM_ASSERT_TYPE (s, scm_car (args), SCM_ARGn, __FUNCTION__, "Stencil");
+
+ extent.unite (s->extent_box ());
+ *tail = scm_cons (s->expr (), SCM_EOL);
+ tail = SCM_CDRLOC (*tail);
+ args = scm_cdr (args);
+ }
+
+ expr = scm_cons (ly_symbol2scm ("combine-stencil"), expr);
+ return Stencil (extent, expr).smobbed_copy ();
+}
- if (!m)
- SCM_ASSERT_TYPE(m, gh_car (args), SCM_ARGn, __FUNCTION__,
- "Stencil");
+LY_DEFINE (ly_make_stencil, "ly:make-stencil",
+ 3, 0, 0, (SCM expr, SCM xext, SCM yext),
+ " \n"
+ "Stencils are a device independent output expressions."
+ "They carry two pieces of information: \n\n"
+ "1: a specification of how to print this object. "
+ "This specification is processed by the output backends, "
+ " for example @file{scm/output-ps.scm}.\n\n"
+ "2: the vertical and horizontal extents of the object.\n\n")
+{
+ SCM_ASSERT_TYPE (!scm_is_pair (expr)
+ || is_stencil_head (scm_car (expr)),
+ expr, SCM_ARG1, __FUNCTION__, "registered stencil expression");
- result.add_stencil (*m);
+ SCM_ASSERT_TYPE (is_number_pair (xext), xext, SCM_ARG2, __FUNCTION__, "number pair");
+ SCM_ASSERT_TYPE (is_number_pair (yext), yext, SCM_ARG3, __FUNCTION__, "number pair");
- args = gh_cdr (args);
- }
-
- return result.smobbed_copy ();
+ Box b (ly_scm2interval (xext), ly_scm2interval (yext));
+ Stencil s (b, expr);
+ return s.smobbed_copy ();
}
-LY_DEFINE(ly_make_stencil,
- "ly:make-stencil", 3, 0, 0, (SCM expr, SCM xext, SCM yext),
- " \n"
-"The objective of any typesetting system is to put ink on paper in the \n"
-"right places. For LilyPond, this final stage is left to the @TeX{} and \n"
-"the printer subsystem. For lily, the last stage in processing a score is \n"
-"outputting a description of what to put where. This description roughly \n"
-"looks like \n"
-"@example \n"
-" PUT glyph AT (x,y) \n"
-" PUT glyph AT (x,y) \n"
-" PUT glyph AT (x,y) \n"
-"@end example \n"
-"you merely have to look at the tex output of lily to see this. \n"
-"Internally these instructions are encoded in Stencils.@footnote{At some \n"
-"point LilyPond also contained Atom-objects, but they have been replaced \n"
-"by Scheme expressions, making the name outdated.} A stencil is \n"
-"what-to-print-where information that also contains dimension information \n"
-"(how large is this glyph?). \n"
-" \n"
-"Conceptually, Stencils can be constructed from Scheme code, by \n"
-"translating a Stencil and by combining two stencils. In BNF \n"
-"notation: \n"
-" \n"
-"@example \n"
-"Stencil :: COMBINE Stencil Stencil \n"
-" | TRANSLATE Offset Stencil \n"
-" | GLYPH-DESCRIPTION \n"
-" ; \n"
-"@end example \n"
-" \n"
-"If you are interested in seeing how this information is stored, you \n"
-"can run with the @code{-f scm} option. The scheme expressions are then \n"
-"dumped in the output file.")
+LY_DEFINE (ly_stencil_aligned_to, "ly:stencil-aligned-to",
+ 3, 0, 0, (SCM stil, SCM axis, SCM dir),
+ "Align @var{stil} using its own extents. "
+ "@var{dir} is a number -1, 1 are left and right respectively. "
+ "Other values are interpolated (so 0 means the center).")
{
- SCM_ASSERT_TYPE (is_number_pair (xext), xext, SCM_ARG2, __FUNCTION__, "number pair");
- SCM_ASSERT_TYPE (is_number_pair (yext), yext, SCM_ARG3, __FUNCTION__, "number pair");
+ SCM_ASSERT_TYPE (unsmob_stencil (stil), stil, SCM_ARG1, __FUNCTION__, "stencil");
+ SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG2, __FUNCTION__, "axis");
+ SCM_ASSERT_TYPE (scm_is_number (dir), dir, SCM_ARG3, __FUNCTION__, "number");
+
+ Stencil target = *unsmob_stencil (stil);
- Box b (ly_scm2interval (xext), ly_scm2interval(yext));
- Stencil m (b, expr);
- return m.smobbed_copy ();
+ target.align_to ((Axis)scm_to_int (axis),
+ scm_to_double (dir));
+ return target.smobbed_copy ();
}
+LY_DEFINE (ly_stencil_fonts, "ly:stencil-fonts",
+ 1, 0, 0, (SCM s),
+ " Analyse @var{s}, and return a list of fonts used in @var{s}.")
+{
+ Stencil *stil = unsmob_stencil (s);
+ SCM_ASSERT_TYPE (stil, s, SCM_ARG1, __FUNCTION__, "Stencil");
+ return find_expression_fonts (stil->expr ());
+}
-SCM
-fontify_atom (Font_metric const * met, SCM f)
+LY_DEFINE (ly_stencil_in_color, "ly:stencil-in-color",
+ 4, 0, 0, (SCM stc, SCM r, SCM g, SCM b),
+ "Put @var{stc} in a different color.")
{
- if (f == SCM_EOL)
- return f;
- else
- return scm_list_n (ly_symbol2scm ("fontify"),
- ly_quote_scm (met->description_), f, SCM_UNDEFINED);
+ Stencil *stil = unsmob_stencil (stc);
+ SCM_ASSERT_TYPE (stil, stc, SCM_ARG1, __FUNCTION__, "Stencil");
+ return Stencil (stil->extent_box (),
+ scm_list_3 (ly_symbol2scm ("color"),
+ scm_list_3 (r, g, b),
+ stil->expr ())).smobbed_copy ();
}
-LY_DEFINE(ly_fontify_atom,"ly:fontify-atom", 2, 0, 0,
- (SCM met, SCM f),
- "Add a font selection command for the font metric @var{met} to @var{f}.")
+struct Stencil_interpret_arguments
{
- SCM_ASSERT_TYPE(unsmob_metrics (met), met, SCM_ARG1, __FUNCTION__, "font metric");
+ SCM func;
+ SCM arg1;
+};
- return fontify_atom (unsmob_metrics (met), f);
+void stencil_interpret_in_scm (void *p, SCM expr)
+{
+ Stencil_interpret_arguments *ap = (Stencil_interpret_arguments *) p;
+ scm_call_2 (ap->func, ap->arg1, expr);
}
-LY_DEFINE(ly_align_to_x,"ly:stencil-align-to!", 3, 0, 0, (SCM mol, SCM axis, SCM dir),
- "Align @var{mol} using its own extents. @var{dir} is a number -1, 1 are "
- " left and right respectively. Other values are interpolated (so 0 means "
- " the center. ")
+LY_DEFINE (ly_interpret_stencil_expression, "ly:interpret-stencil-expression",
+ 4, 0, 0, (SCM expr, SCM func, SCM arg1, SCM offset),
+ "Parse EXPR, feed bits to FUNC with first arg ARG1")
{
- SCM_ASSERT_TYPE(unsmob_stencil (mol), mol, SCM_ARG1, __FUNCTION__, "stencil");
- SCM_ASSERT_TYPE(is_axis (axis), axis, SCM_ARG2, __FUNCTION__, "axis");
- SCM_ASSERT_TYPE(gh_number_p (dir), dir, SCM_ARG3, __FUNCTION__, "number");
+ SCM_ASSERT_TYPE (ly_is_procedure (func), func, SCM_ARG1, __FUNCTION__,
+ "procedure");
+
+ Stencil_interpret_arguments a;
+ a.func = func;
+ a.arg1 = arg1;
+ Offset o = ly_scm2offset (offset);
+
+ interpret_stencil_expression (expr, stencil_interpret_in_scm, (void *) & a, o);
+
+ return SCM_UNSPECIFIED;
+}
- unsmob_stencil (mol)->align_to ((Axis)gh_scm2int (axis),
- gh_scm2double (dir));
+LY_DEFINE (ly_bracket, "ly:bracket",
+ 4, 0, 0,
+ (SCM a, SCM iv, SCM t, SCM p),
+ "Make a bracket in direction @var{a}. The extent of the bracket is "
+ "given by @var{iv}. The wings protude by an amount of @var{p}, which "
+ "may be negative. The thickness is given by @var{t}.")
+{
+ SCM_ASSERT_TYPE (is_axis (a), a, SCM_ARG1, __FUNCTION__, "axis");
+ SCM_ASSERT_TYPE (is_number_pair (iv), iv, SCM_ARG2, __FUNCTION__, "number pair");
+ SCM_ASSERT_TYPE (scm_is_number (t), a, SCM_ARG3, __FUNCTION__, "number");
+ SCM_ASSERT_TYPE (scm_is_number (p), a, SCM_ARG4, __FUNCTION__, "number");
+
+ return Lookup::bracket ((Axis)scm_to_int (a), ly_scm2interval (iv),
+ scm_to_double (t),
+ scm_to_double (p),
+ 0.95 * scm_to_double (t)).smobbed_copy ();
+}
- return SCM_UNDEFINED;
+LY_DEFINE (ly_rotate_stencil, "ly:stencil-rotate",
+ 4, 0, 0, (SCM stil, SCM angle, SCM x, SCM y),
+ "Return a @var{stil} rotated @var{angle} degrees around point (@var{x}, @var{y}).")
+{
+ Stencil *s = unsmob_stencil (stil);
+ SCM_ASSERT_TYPE (s, stil, SCM_ARG1, __FUNCTION__, "stencil");
+ SCM_ASSERT_TYPE (scm_is_number (angle), angle, SCM_ARG2, __FUNCTION__, "number");
+ SCM_ASSERT_TYPE (scm_is_number (x), x, SCM_ARG3, __FUNCTION__, "number");
+ SCM_ASSERT_TYPE (scm_is_number (y), y, SCM_ARG4, __FUNCTION__, "number");
+ Real a = scm_to_double (angle);
+ Real x_off = scm_to_double (x);
+ Real y_off = scm_to_double (y);
+
+ SCM new_s = s->smobbed_copy ();
+ Stencil *q = unsmob_stencil (new_s);
+ q->rotate (a, Offset (x_off, y_off));
+ return new_s;
+}
+
+LY_DEFINE (ly_filled_box, "ly:round-filled-box",
+ 3, 0, 0,
+ (SCM xext, SCM yext, SCM blot),
+ "Make a @code{Stencil} "
+ "that prints a black box of dimensions @var{xext}, "
+ "@var{yext} and roundness @var{blot}.")
+{
+ SCM_ASSERT_TYPE (is_number_pair (xext), xext, SCM_ARG1, __FUNCTION__, "number pair");
+ SCM_ASSERT_TYPE (is_number_pair (yext), yext, SCM_ARG2, __FUNCTION__, "number pair");
+ SCM_ASSERT_TYPE (scm_is_number (blot), blot, SCM_ARG3, __FUNCTION__, "number");
+
+ return Lookup::round_filled_box (Box (ly_scm2interval (xext), ly_scm2interval (yext)),
+ scm_to_double (blot)).smobbed_copy ();
+}
+
+LY_DEFINE (ly_register_stencil_expression, "ly:register-stencil-expression",
+ 1, 0, 0,
+ (SCM symbol),
+ "Add @var{symbol} as head of a stencil expression")
+{
+ SCM_ASSERT_TYPE (scm_is_symbol (symbol), symbol,
+ SCM_ARG1, __FUNCTION__, "Symbol");
+ register_stencil_head (symbol);
+ return SCM_UNSPECIFIED;
+}
+
+LY_DEFINE (ly_all_stencil_expressions, "ly:all-stencil-expressions",
+ 0, 0, 0,
+ (),
+ "Return all symbols recognized as stencil expressions.")
+{
+ return all_stencil_heads ();
}
projects / lilypond.git / blobdiff