lily/general-scheme.cc

   1 /*
   2   lily-guile.cc -- implement assorted Guile bindings
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2007 Jan Nieuwenhuizen <janneke@gnu.org>
   7   Han-Wen Nienhuys <hanwen@xs4all.nl>
   8 */
   9
  10 #include "config.hh"
  11
  12 #include <cstdio>
  13 #include <ctype.h>
  14 #include <cstring>  /* memset */
  15 using namespace std;
  16
  17 #include "international.hh"
  18 #include "libc-extension.hh"
  19 #include "lily-guile.hh"
  20 #include "misc.hh"
  21 #include "warn.hh"
  22 #include "version.hh"
  23 #include "dimensions.hh"
  24 #include "main.hh"
  25 #include "file-path.hh"
  26 #include "relocate.hh"
  27 #include "file-name.hh"
  28 #include "string-convert.hh"
  29
  30 LY_DEFINE (ly_start_environment, "ly:start-environment",
  31            0, 0, 0, (),
  32            "Return the environment (a list of strings) that was in"
  33            " effect at program start.")
  34 {
  35   SCM l = SCM_EOL;
  36   SCM *tail = &l;
  37
  38   for (vsize i = 0; i < start_environment_global.size (); i++)
  39     {
  40       *tail = scm_cons (ly_string2scm (start_environment_global[i]),
  41                         SCM_EOL);
  42       tail = SCM_CDRLOC(*tail);
  43     }
  44
  45   return l;
  46 }
  47
  48
  49 LY_DEFINE (ly_find_file, "ly:find-file",
  50            1, 0, 0, (SCM name),
  51            "Return the absolute file name of @var{name},"
  52            " or @code{#f} if not found.")
  53 {
  54   LY_ASSERT_TYPE (scm_is_string, name, 1);
  55
  56   string nm = ly_scm2string (name);
  57   string file_name = global_path.find (nm);
  58   if (file_name.empty ())
  59     return SCM_BOOL_F;
  60
  61   return ly_string2scm (file_name);
  62 }
  63
  64 /*
  65   Ugh. Gulped file is copied twice. (maybe thrice if you count stdio
  66   buffering.)
  67 */
  68 LY_DEFINE (ly_gulp_file, "ly:gulp-file",
  69            1, 1, 0, (SCM name, SCM size),
  70            "Read the file @var{name}, and return its contents in a string."
  71            "  The file is looked up using the search path.")
  72 {
  73   LY_ASSERT_TYPE (scm_is_string, name, 1);
  74   int sz = INT_MAX;
  75   if (size != SCM_UNDEFINED)
  76     {
  77       LY_ASSERT_TYPE (scm_is_number, size, 2);
  78       sz = scm_to_int (size);
  79     }
  80
  81   string contents = gulp_file_to_string (ly_scm2string (name), true, sz);
  82   return scm_from_locale_stringn (contents.c_str (), contents.length ());
  83 }
  84
  85 LY_DEFINE (ly_error, "ly:error",
  86            1, 0, 1, (SCM str, SCM rest),
  87            "A Scheme callable function to issue the error @var{str}."
  88            "  The error is formatted with @code{format} and @var{rest}.")
  89 {
  90   LY_ASSERT_TYPE (scm_is_string, str, 1);
  91   str = scm_simple_format (SCM_BOOL_F, str, rest);
  92   error (ly_scm2string (str));
  93   return SCM_UNSPECIFIED;
  94 }
  95
  96 LY_DEFINE (ly_message, "ly:message",
  97            1, 0, 1, (SCM str, SCM rest),
  98            "A Scheme callable function to issue the message @var{str}."
  99            "  The message is formatted with @code{format} and @var{rest}.")
 100 {
 101   LY_ASSERT_TYPE (scm_is_string, str, 1);
 102   str = scm_simple_format (SCM_BOOL_F, str, rest);
 103   message (ly_scm2string (str));
 104   return SCM_UNSPECIFIED;
 105 }
 106
 107 LY_DEFINE (ly_progress, "ly:progress",
 108            1, 0, 1, (SCM str, SCM rest),
 109            "A Scheme callable function to print progress @var{str}."
 110            "  The message is formatted with @code{format} and @var{rest}.")
 111 {
 112   LY_ASSERT_TYPE (scm_is_string, str, 1);
 113   str = scm_simple_format (SCM_BOOL_F, str, rest);
 114   progress_indication (ly_scm2string (str));
 115   return SCM_UNSPECIFIED;
 116 }
 117
 118 LY_DEFINE (ly_programming_error, "ly:programming-error",
 119            1, 0, 1, (SCM str, SCM rest),
 120            "A Scheme callable function to issue the internal warning"
 121            "  @var{str}.  The message is formatted with @code{format}"
 122            " and @var{rest}.")
 123 {
 124   LY_ASSERT_TYPE (scm_is_string, str, 1);
 125   str = scm_simple_format (SCM_BOOL_F, str, rest);
 126   programming_error (ly_scm2string (str));
 127   return SCM_UNSPECIFIED;
 128 }
 129
 130 LY_DEFINE (ly_warning, "ly:warning",
 131            1, 0, 1, (SCM str, SCM rest),
 132            "A Scheme callable function to issue the warning @code{str}."
 133            "  The message is formatted with @code{format} and @code{rest}.")
 134 {
 135   LY_ASSERT_TYPE (scm_is_string, str, 1);
 136   str = scm_simple_format (SCM_BOOL_F, str, rest);
 137   warning (ly_scm2string (str));
 138   return SCM_UNSPECIFIED;
 139 }
 140
 141 LY_DEFINE (ly_dir_p, "ly:dir?",
 142            1, 0, 0, (SCM s),
 143            "A type predicate.  The direction@tie{}@code{s} is @code{-1},"
 144            " @code{0} or@tie{}@code{1}, where @code{-1} represents"
 145            " left or down and @code{1} represents right or up.")
 146 {
 147   if (scm_is_number (s))
 148     {
 149       int i = scm_to_int (s);
 150       return (i >= -1 && i <= 1) ? SCM_BOOL_T : SCM_BOOL_F;
 151     }
 152   return SCM_BOOL_F;
 153 }
 154
 155 LY_DEFINE (ly_assoc_get, "ly:assoc-get",
 156            2, 1, 0,
 157            (SCM key, SCM alist, SCM default_value),
 158            "Return value if @var{key} in @var{alist}, else @code{default-value}"
 159            " (or @code{#f} if not specified).")
 160 {
 161   LY_ASSERT_TYPE(ly_cheap_is_list, alist, 2);
 162
 163   SCM handle = scm_assoc (key, alist);
 164   if (scm_is_pair (handle))
 165     return scm_cdr (handle);
 166
 167   if (default_value == SCM_UNDEFINED)
 168     default_value = SCM_BOOL_F;
 169
 170   return default_value;
 171 }
 172
 173 LY_DEFINE (ly_string_substitute, "ly:string-substitute",
 174            3, 0, 0, (SCM a, SCM b, SCM s),
 175            "Replace string@tie{}@var{a} by string@tie{}@var{b} in"
 176            " string@tie{}@var{s}.")
 177 {
 178   LY_ASSERT_TYPE (scm_is_string, s, 1);
 179   LY_ASSERT_TYPE (scm_is_string, b, 2);
 180   LY_ASSERT_TYPE (scm_is_string, s, 3);
 181
 182   string ss = ly_scm2string (s);
 183   replace_all (&ss, ly_scm2string (a),
 184                ly_scm2string (b));
 185
 186   return ly_string2scm (ss);
 187 }
 188
 189 LY_DEFINE (ly_number_2_string, "ly:number->string",
 190            1, 0, 0, (SCM s),
 191            "Convert @var{num} to a string without generating many decimals.")
 192 {
 193   LY_ASSERT_TYPE (scm_is_number, s, 1);
 194
 195   char str[400];                        // ugh.
 196
 197   if (scm_exact_p (s) == SCM_BOOL_F)
 198     {
 199       Real r (scm_to_double (s));
 200         if (isinf (r) || isnan (r))
 201           {
 202             programming_error (_ ("infinity or NaN encountered while converting Real number"));
 203             programming_error (_ ("setting to zero"));
 204
 205             r = 0.0;
 206           }
 207
 208       snprintf (str, sizeof (str), "%.4f", r);
 209     }
 210   else
 211     snprintf (str, sizeof (str), "%d", int (scm_to_int (s)));
 212
 213   return scm_from_locale_string (str);
 214 }
 215
 216 LY_DEFINE (ly_version, "ly:version", 0, 0, 0, (),
 217            "Return the current lilypond version as a list, e.g.,"
 218            " @code{(1 3 127 uu1)}.")
 219 {
 220   char const *vs = "\'(" MAJOR_VERSION " " MINOR_VERSION " " PATCH_LEVEL " " MY_PATCH_LEVEL ")";
 221
 222   return scm_c_eval_string ((char *)vs);
 223 }
 224
 225 LY_DEFINE (ly_unit, "ly:unit", 0, 0, 0, (),
 226            "Return the unit used for lengths as a string.")
 227 {
 228   return scm_from_locale_string (INTERNAL_UNIT);
 229 }
 230
 231 LY_DEFINE (ly_dimension_p, "ly:dimension?", 1, 0, 0, (SCM d),
 232            "Return @var{d} as a number.  Used to distinguish length"
 233            " variables from normal numbers.")
 234 {
 235   return scm_number_p (d);
 236 }
 237
 238 /*
 239   Debugging mem leaks:
 240 */
 241 LY_DEFINE (ly_protects, "ly:protects",
 242            0, 0, 0, (),
 243            "Return hash of protected objects.")
 244 {
 245   return scm_protects;
 246 }
 247
 248 LY_DEFINE (ly_gettext, "ly:gettext",
 249            1, 0, 0, (SCM original),
 250            "A Scheme wrapper function for @code{gettext}.")
 251 {
 252   LY_ASSERT_TYPE (scm_is_string, original, 1);
 253   return ly_string2scm (_ (ly_scm2string (original).c_str ()));
 254 }
 255
 256 LY_DEFINE (ly_output_formats, "ly:output-formats",
 257            0, 0, 0, (),
 258            "Formats passed to @option{--format} as a list of strings,"
 259            " used for the output.")
 260 {
 261   vector<string> output_formats = string_split (output_format_global, ',');
 262
 263   SCM lst = SCM_EOL;
 264   int output_formats_count = output_formats.size ();
 265   for (int i = 0; i < output_formats_count; i++)
 266     lst = scm_cons (ly_string2scm (output_formats[i]), lst);
 267
 268   return lst;
 269 }
 270
 271 LY_DEFINE (ly_wide_char_2_utf_8, "ly:wide-char->utf-8",
 272            1, 0, 0, (SCM wc),
 273            "Encode the Unicode codepoint @var{wc}, an integer, as UTF-8.")
 274 {
 275   char buf[5];
 276
 277   LY_ASSERT_TYPE (scm_is_integer, wc, 1);
 278   unsigned wide_char = (unsigned) scm_to_int (wc);
 279   char *p = buf;
 280
 281   if (wide_char < 0x0080)
 282     *p++ = (char)wide_char;
 283   else if (wide_char < 0x0800)
 284     {
 285       *p++ = (char) (((wide_char >> 6)) | 0xC0);
 286       *p++ = (char) (((wide_char) & 0x3F) | 0x80);
 287     }
 288   else if (wide_char < 0x10000)
 289     {
 290       *p++ = (char) (((wide_char >> 12)) | 0xE0);
 291       *p++ = (char) (((wide_char >> 6) & 0x3F) | 0x80);
 292       *p++ = (char) (((wide_char) & 0x3F) | 0x80);
 293     }
 294   else
 295     {
 296       *p++ = (char) (((wide_char >> 18)) | 0xF0);
 297       *p++ = (char) (((wide_char >> 12) & 0x3F) | 0x80);
 298       *p++ = (char) (((wide_char >> 6) & 0x3F) | 0x80);
 299       *p++ = (char) (((wide_char) & 0x3F) | 0x80);
 300     }
 301   *p = 0;
 302
 303   return scm_from_locale_string (buf);
 304 }
 305
 306 LY_DEFINE (ly_effective_prefix, "ly:effective-prefix",
 307            0, 0, 0, (),
 308            "Return effective prefix.")
 309 {
 310   return ly_string2scm (lilypond_datadir);
 311 }
 312
 313 LY_DEFINE (ly_chain_assoc_get, "ly:chain-assoc-get",
 314            2, 1, 0, (SCM key, SCM achain, SCM dfault),
 315            "Return value for @var{key} from a list of alists @var{achain}."
 316            "  If no entry is found, return @var{dfault} or @code{#f} if no"
 317            " @var{dfault} is specified.")
 318 {
 319   if (scm_is_pair (achain))
 320     {
 321       SCM handle = scm_assoc (key, scm_car (achain));
 322       if (scm_is_pair (handle))
 323         return scm_cdr (handle);
 324       else
 325         return ly_chain_assoc_get (key, scm_cdr (achain), dfault);
 326     }
 327   return dfault == SCM_UNDEFINED ? SCM_BOOL_F : dfault;
 328 }
 329
 330
 331 LY_DEFINE (ly_stderr_redirect, "ly:stderr-redirect",
 332            1, 1, 0, (SCM file_name, SCM mode),
 333            "Redirect stderr to @var{file-name}, opened with @var{mode}.")
 334 {
 335   LY_ASSERT_TYPE (scm_is_string, file_name, 1);
 336
 337   string m = "w";
 338   if (mode != SCM_UNDEFINED && scm_string_p (mode))
 339     m = ly_scm2string (mode);
 340   /* dup2 and (fileno (current-error-port)) do not work with mingw'c
 341      gcc -mwindows.  */
 342   fflush (stderr);
 343   freopen (ly_scm2string (file_name).c_str (), m.c_str (), stderr);
 344   return SCM_UNSPECIFIED;
 345 }
 346
 347 static SCM
 348 accumulate_symbol (void *closure, SCM key, SCM val, SCM result)
 349 {
 350   (void) closure;
 351   (void) val;
 352   return scm_cons (key, result);
 353 }
 354
 355 LY_DEFINE (ly_hash_table_keys, "ly:hash-table-keys",
 356           1,0,0, (SCM tab),
 357           "Return a list of keys in @var{tab}.")
 358 {
 359   return scm_internal_hash_fold ((Hash_closure_function) & accumulate_symbol,
 360                                  NULL, SCM_EOL, tab);
 361 }
 362
 363 LY_DEFINE (ly_camel_case_2_lisp_identifier, "ly:camel-case->lisp-identifier",
 364            1, 0, 0, (SCM name_sym),
 365            "Convert @code{FooBar_Bla} to @code{foo-bar-bla} style symbol.")
 366 {
 367   LY_ASSERT_TYPE (ly_is_symbol, name_sym, 1);
 368
 369   /*
 370     TODO: should use strings instead?
 371   */
 372
 373   const string in = ly_symbol2string (name_sym);
 374   string result = camel_case_to_lisp_identifier (in);
 375
 376   return ly_symbol2scm (result.c_str ());
 377 }
 378
 379 LY_DEFINE (ly_expand_environment, "ly:expand-environment",
 380            1, 0, 0, (SCM str),
 381            "Expand @code{$VAR} and @code{$@{VAR@}} in @var{str}.")
 382 {
 383   LY_ASSERT_TYPE (scm_is_string, str, 1);
 384
 385   return ly_string2scm (expand_environment_variables (ly_scm2string (str)));
 386 }
 387
 388
 389 LY_DEFINE (ly_truncate_list_x, "ly:truncate-list!",
 390            2, 0, 0, (SCM lst, SCM i),
 391            "Take at most the first @var{i} of list @var{lst}.")
 392 {
 393   LY_ASSERT_TYPE (scm_is_integer, i, 1);
 394
 395   int k = scm_to_int (i);
 396   if (k == 0)
 397     lst = SCM_EOL;
 398   else
 399     {
 400       SCM s = lst;
 401       k--;
 402       for (; scm_is_pair (s) && k--; s = scm_cdr (s))
 403         ;
 404
 405       if (scm_is_pair (s))
 406         scm_set_cdr_x (s, SCM_EOL);
 407     }
 408   return lst;
 409 }
 410
 411 string
 412 format_single_argument (SCM arg, int precision)
 413 {
 414   if (scm_is_integer (arg) && scm_exact_p (arg) == SCM_BOOL_T)
 415     return (String_convert::int_string (scm_to_int (arg)));
 416   else if (scm_is_number (arg))
 417     {
 418       Real val = scm_to_double (arg);
 419
 420       if (isnan (val) || isinf (val))
 421         {
 422           warning (_ ("Found infinity or nan in output. Substituting 0.0"));
 423           return ("0.0");
 424           if (strict_infinity_checking)
 425             abort ();
 426         }
 427       else
 428         return (String_convert::form_string ("%.*lf", precision, val));
 429     }
 430   else if (scm_is_string (arg))
 431     return (ly_scm2string (arg));
 432   else if (scm_is_symbol (arg))
 433     return (ly_symbol2string (arg));
 434   else
 435     {
 436       ly_progress (scm_from_locale_string ("Unsupported SCM value for format: ~a"),
 437                    scm_list_1 (arg));
 438     }
 439
 440
 441   return "";
 442 }
 443
 444 LY_DEFINE (ly_format, "ly:format",
 445            1, 0, 1, (SCM str, SCM rest),
 446            "LilyPond specific format, supporting @code{~a} and @code{~[0-9]f}.")
 447 {
 448   LY_ASSERT_TYPE (scm_is_string, str, 1);
 449
 450   string format = ly_scm2string (str);
 451   vector<string> results;
 452
 453   vsize i = 0;
 454   while (i < format.size ())
 455     {
 456       vsize tilde = format.find ('~', i);
 457
 458       results.push_back (format.substr (i, (tilde-i)));
 459
 460       if (tilde == NPOS)
 461         break ;
 462
 463       tilde ++;
 464
 465       char spec = format.at (tilde ++);
 466       if (spec == '~')
 467         results.push_back ("~");
 468       else
 469         {
 470           if (!scm_is_pair (rest))
 471             {
 472               programming_error (string (__FUNCTION__)
 473                                  + ": not enough arguments for format.");
 474               return ly_string2scm ("");
 475             }
 476
 477           SCM arg = scm_car (rest);
 478           rest = scm_cdr (rest);
 479
 480           int precision = 8;
 481
 482           if (spec == '$')
 483             precision = 2;
 484           else if (isdigit (spec))
 485             {
 486               precision = spec - '0';
 487               spec = format.at (tilde ++);
 488             }
 489
 490           if (spec == 'a' || spec == 'A' || spec == 'f' || spec == '$')
 491             results.push_back (format_single_argument (arg, precision));
 492           else if (spec == 'l')
 493             {
 494               SCM s = arg;
 495               for (; scm_is_pair (s); s = scm_cdr (s))
 496                 {
 497                   results.push_back (format_single_argument (scm_car (s), precision));
 498                   if (scm_cdr (s) != SCM_EOL)
 499                     results.push_back (" ");
 500                 }
 501
 502               if (s != SCM_EOL)
 503                 results.push_back (format_single_argument (s, precision));
 504
 505             }
 506         }
 507
 508       i = tilde;
 509     }
 510
 511   if (scm_is_pair (rest))
 512     programming_error (string (__FUNCTION__)
 513                        + ": too many  arguments");
 514
 515   vsize len = 0;
 516   for (vsize i = 0; i < results.size (); i++)
 517     len += results[i].size ();
 518
 519   char *result = (char*) scm_malloc (len + 1);
 520   char *ptr = result;
 521   for (vsize i = 0; i < results.size (); i++)
 522     {
 523       strncpy (ptr, results[i].c_str (), results[i].size ());
 524       ptr += results[i].size ();
 525     }
 526   *ptr = '\0';
 527
 528   return scm_take_locale_stringn (result, len);
 529 }