2 lily-guile.cc -- implement assorted guile functions
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2000 Jan Nieuwenhuizen <janneke@gnu.org>
8 Han-Wen Nienhuys <hanwen@cs.uu.nl>
15 #include "libc-extension.hh"
16 #include "lily-guile.hh"
18 #include "simple-file-storage.hh"
19 #include "file-path.hh"
21 #include "direction.hh"
25 ly_str02scm (char const*c)
27 // this all really sucks, guile should take char const* arguments!
28 return gh_str02scm ((char*)c);
32 ly_eval_str (String s)
34 // this all really sucks, guile should take char const* arguments!
35 return gh_eval_str ((char*)s.ch_C ());
40 Pass string to scm parser, evaluate one expression.
41 Return result value and #chars read.
43 Thanks to Gary Houston <ghouston@freewire.co.uk>
45 Need guile-1.3.4 (>1.3 anyway) for ftell on str ports -- jcn
48 ly_parse_scm (char const* s, int* n)
50 SCM str = gh_str02scm ((char*)s);
51 SCM port = scm_mkstrport (SCM_INUM0, str, SCM_OPN | SCM_RDNG,
53 SCM from = scm_ftell (port);
56 SCM answer = SCM_UNSPECIFIED;
58 /* Read expression from port */
59 if (!SCM_EOF_OBJECT_P (form = scm_read (port)))
60 answer = scm_eval_x (form);
67 all seems fine, but after parsing
71 read_buf has been advanced to read_pos - 1,
72 so that scm_ftell returns 1, instead of #parsed chars
76 urg: reset read_buf for scm_ftell
77 shouldn't scm_read () do this for us?
79 scm_fill_input (port);
80 SCM to = scm_ftell (port);
81 *n = gh_scm2int (to) - gh_scm2int (from);
83 /* Don't close the port here; if we re-enter this function via a
84 continuation, then the next time we enter it, we'll get an error.
85 It's a string port anyway, so there's no advantage to closing it
88 scm_close_port (port);
95 scm_m_quote doesn't use any env, but needs one for a good signature in GUILE.
100 return gh_list (ly_symbol2scm ("quote"), s, SCM_UNDEFINED);
105 ly_symbol2scm(const char *s)
107 return gh_symbol2scm ((char *)s);
111 ly_symbol2string (SCM s)
113 assert (gh_symbol_p (s));
114 return String((Byte*)SCM_CHARS (s), (int) SCM_LENGTH(s));
119 Read a file, and shove it down GUILE. GUILE also has file read
120 functions, but you can't fiddle with the path of those.
123 read_lily_scm_file (String fn)
125 String s = global_path.find (fn);
128 String e = _f ("Can't find file: `%s'", fn);
130 e += _f ("(load path: `%s')", global_path.str ());
134 progress_indication ("[" + s);
137 Simple_file_storage f(s);
139 ly_eval_str ((char *) f.ch_C());
140 progress_indication ("]");
145 ly_gulp_file (SCM name)
147 String fn (ly_scm2string (name));
148 String s = global_path.find (fn);
151 String e = _f ("Can't find file: `%s'", fn);
153 e += _f ("(load path: `%s')", global_path.str ());
157 progress_indication ("[" + s );
160 Simple_file_storage f(s);
161 SCM result = ly_str02scm (f.ch_C());
162 progress_indication ("]");
167 ly_display_scm (SCM s)
174 ly_scm2string (SCM s)
176 assert (gh_string_p (s));
178 char * p = gh_scm2newstr (s , &len);
187 index_cell (SCM s, Direction d)
190 return (d == LEFT) ? gh_car (s) : gh_cdr (s);
194 index_set_cell (SCM s, Direction d, SCM v)
206 assert (gh_string_p (str));
207 warning ("lily-guile: " + ly_scm2string (str));
216 int i = gh_scm2int (s);
217 return (i>= -1 && i <= 1) ? SCM_BOOL_T : SCM_BOOL_F;
226 scm_make_gsubr ("ly-warn", 1, 0, 0, (SCM(*)(...))ly_warning);
227 scm_make_gsubr ("ly-gulp-file", 1,0, 0, (SCM(*)(...))ly_gulp_file);
228 scm_make_gsubr ("dir?", 1,0, 0, (SCM(*)(...))ly_isdir_p);
231 ADD_SCM_INIT_FUNC(funcs, init_functions);
234 typedef void (*Void_fptr)();
235 Array<Void_fptr> *scm_init_funcs_;
237 void add_scm_init_func (void (*f)())
239 if (!scm_init_funcs_)
240 scm_init_funcs_ = new Array<Void_fptr>;
242 scm_init_funcs_->push (f);
248 for (int i=scm_init_funcs_->size() ; i--;)
249 (scm_init_funcs_->elem (i)) ();
252 unsigned int ly_scm_hash (SCM s)
254 return scm_ihashv (s, ~1u);
264 int i = gh_scm2int (s);
265 return i>= -1 && i <= 1;
273 return (Direction) gh_scm2int (s);
280 return gh_int2scm (i);
287 scm_to (SCM s, int* )
289 return gh_number_p (s) ? gh_scm2int (s) : 0;
295 return gh_double2scm (r);
299 scm_to (SCM s, Real* )
301 return gh_number_p (s) ? gh_scm2double (s) : 0;
307 return gh_boolean_p (s) && gh_scm2bool (s);
311 Appendable list L: the cdr contains the list, the car the last cons
317 SCM s = gh_cons (SCM_EOL, SCM_EOL);
324 appendable_list_append (SCM l, SCM elt)
326 SCM newcons = gh_cons (elt, SCM_EOL);
328 gh_set_cdr_x (gh_car (l), newcons);
329 gh_set_car_x (l, newcons);
334 ly_offset2scm (Offset o)
336 return gh_cons (gh_double2scm (o[X_AXIS]), gh_double2scm(o[Y_AXIS]));