Imported Upstream version 2.14.2

[lilypond.git] / lily / misc.cc

diff --git a/lily/misc.cc b/lily/misc.cc
index 9ff95f2a020e9926ef66955f929d70d8f2c79bda..4b7dc472ed6fc1312522683de8321ba159645a6a 100644 (file)
--- a/lily/misc.cc
+++ b/lily/misc.cc
@@ -1,69 +1,119 @@
 /*
-  misc.cc -- implement various stuff
+  This file is part of LilyPond, the GNU music typesetter.
 
-  source file of the GNU LilyPond music typesetter
+  Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  Jan Nieuwenhuizen <janneke@gnu.org>
 
-  (c)  1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
-    Jan Nieuwenhuizen <janneke@gnu.org>
+  LilyPond is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  LilyPond is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include <math.h>
+
 #include "misc.hh"
+#include "warn.hh"
 
 /*
-  Return the 2-log, rounded down 
- */
+  Return the 2-log, rounded down
+*/
 int
-intlog2(int d)
+intlog2 (int d)
 {
   assert (d);
-  int i=0;
-  while ((d != 1)) 
+  int i = 0;
+  while ((d != 1))
     {
-      d/= 2;
+      d /= 2;
       i++;
     }
-  
-  assert (!(d/2));
+
+  assert (! (d / 2));
   return i;
 }
 
 double
-log_2(double x)
+log_2 (double x)
 {
-  return log (x)  /log (2.0);
+  return log (x) / log (2.0);
 }
 
+Real
+directed_round (Real f, Direction d)
+{
+  if (d < 0)
+    return floor (f);
+  else
+    return ceil (f);
+}
+
+
+
+/*
+   0 at threshold,  1 at 0, with 1/x falloff.
+ */
+Real
+peak_around (Real epsilon,  Real threshold, Real x)
+{
+  if (x < 0)
+    return 1.0;
+  return max (- epsilon * (x - threshold) / ((x + epsilon) * threshold), 0.0);
+}
 
-static int
-comp (Real const &a, Real const &b)
+/*
+  0 at 0,  1 at standard_x, and increasing thereafter. 
+ */
+Real
+convex_amplifier (Real standard_x, Real increase_factor, Real x)
 {
-  return sign (a-b);
+  return (exp (increase_factor * x / standard_x) - 1.0) / (exp (increase_factor) - 1.0); 
 }
 
-Interval
-quantise_iv (Array<Real> positions, Real x)
+string
+camel_case_to_lisp_identifier (string in)
 {
-  positions.sort (comp);
-  Real period = positions.top () - positions[0];
+  vector<char> out;
   
-  int n =  int ((x - positions[0]) / period);
-  Real frac = (x - positions[0] ) -  n * period;
-
-  while (frac < 0)
+  /* don't add '-' before first character */
+  out.push_back (char (tolower (in[0])));
+    
+  for (size_t inpos = 1; inpos < in.size (); inpos++)
     {
-      frac += period;
-      n --;
+      if (isupper (in[inpos]))
+       out.push_back ('-');
+      out.push_back ( char(tolower (in[inpos])));
     }
   
-  Real px = frac + positions[0];
-  assert ( positions[0] <= px && px <= positions.top ());
-  int i=0;
-  for (; i < positions.size () - 1; i++)
-    {
-      if (positions[i] <= px && px <= positions[i+1])
-       break; 
-    }
+  string result (&out[0], out.size ());
+  replace_all (&result, '_', '-');
+
+  return result;
+}
+
+vsize
+utf8_char_len (char current)
+{
+  vsize char_len = 1;
+
+  // U+10000 - U+10FFFF
+  if ((current & 0xF0) == 0xF0)
+    char_len = 4;
+  // U+0800 - U+FFFF
+  else if ((current & 0xE0) == 0xE0)
+    char_len = 3;
+  // U+0080 - U+07FF
+  else if ((current & 0xC0) == 0xC0)
+    char_len = 2;
+  else if (current & 0x80)
+    programming_error ("invalid UTF-8 string");
 
-  return Interval (positions[i] , positions[i+1]) + period * n;
+  return char_len;
 }