release: 1.3.0

[lilypond.git] / lily / lily-guile.cc

diff --git a/lily/lily-guile.cc b/lily/lily-guile.cc
index 311397cdd857a66669592b0a828b0928a4a4b218..51b56ca726deb798e2b889965d80486f795a0837 100644 (file)
--- a/lily/lily-guile.cc
+++ b/lily/lily-guile.cc
@@ -33,6 +33,62 @@ ly_ch_C_eval_scm (char const*c)
   return gh_eval_str ((char*)c);
 }
 
+  
+/*
+  Pass string to scm parser, evaluate one expression.
+  Return result value and #chars read.
+
+  Thanks to Gary Houston <ghouston@freewire.co.uk>
+
+  Need guile-1.3.4 (>1.3 anyway) for ftell on str ports -- jcn
+*/
+SCM
+ly_parse_scm (char const* s, int* n)
+{
+  SCM str = gh_str02scm ((char*)s);
+  SCM port = scm_mkstrport (SCM_INUM0, str, SCM_OPN | SCM_RDNG,
+                            "scm_eval_0str");
+  SCM from = scm_ftell (port);
+
+  SCM form;
+  SCM answer = SCM_UNSPECIFIED;
+
+  /* Read expression from port */
+  if (!SCM_EOF_OBJECT_P (form = scm_read (port)))
+    answer = scm_eval_x (form);
+
+  /*
+   After parsing
+
+       (begin (foo 1 2))
+
+   all seems fine, but after parsing
+
+       (foo 1 2)
+
+   read_buf has been advanced to read_pos - 1,
+   so that scm_ftell returns 1, instead of #parsed chars
+   */
+  
+  /*
+    urg: reset read_buf for scm_ftell
+    shouldn't scm_read () do this for us?
+  */
+  scm_fill_input (port);
+  SCM to = scm_ftell (port);
+  *n = gh_scm2int (to) - gh_scm2int (from);
+
+  /* Don't close the port here; if we re-enter this function via a
+     continuation, then the next time we enter it, we'll get an error.
+     It's a string port anyway, so there's no advantage to closing it
+     early.
+
+     scm_close_port (port);
+  */
+
+  return answer;
+}
+
 /*
   scm_m_quote doesn't use any env, but needs one for a good signature in GUILE.
 */
@@ -129,7 +185,7 @@ ly_scm2string (SCM s)
   char * p = gh_scm2newstr (s , &len);
   
   String r (p);
-  //  delete p;
+
   free (p);
   return r;
 }
@@ -168,14 +224,28 @@ init_functions ()
   scm_make_gsubr ("ly-gulp-file", 1,0, 0, (SCM(*)(...))ly_gulp_file);
 }
 
-extern void init_symbols ();
-extern void init_smobs ();     // guh -> .hh
+ADD_SCM_INIT_FUNC(funcs, init_functions);
+
 
+typedef void (*Void_fptr)();
+Array<Void_fptr> *scm_init_funcs_;
+
+void add_scm_init_func (void (*f)())
+{
+  if (!scm_init_funcs_)
+    scm_init_funcs_ = new Array<Void_fptr>;
+
+  scm_init_funcs_->push (f);
+}
 
 void
 init_lily_guile ()
 {
-  init_symbols();
-  init_functions ();
-  init_smobs ();
+  for (int i=scm_init_funcs_->size() ; i--;)
+    (scm_init_funcs_->elem (i)) ();
+}
+
+unsigned int ly_scm_hash (SCM s)
+{
+  return scm_ihashv (s, ~1u);
 }