lily/general-scheme.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1998--2010 Jan Nieuwenhuizen <janneke@gnu.org>
   5   Han-Wen Nienhuys <hanwen@xs4all.nl>
   6
   7   LilyPond is free software: you can redistribute it and/or modify
   8   it under the terms of the GNU General Public License as published by
   9   the Free Software Foundation, either version 3 of the License, or
  10   (at your option) any later version.
  11
  12   LilyPond is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "config.hh"
  22
  23 #include <cstdio>
  24 #include <ctype.h>
  25 #include <cstring>  /* memset */
  26 using namespace std;
  27
  28 #include "dimensions.hh"
  29 #include "file-name.hh"
  30 #include "file-path.hh"
  31 #include "international.hh"
  32 #include "libc-extension.hh"
  33 #include "lily-guile.hh"
  34 #include "main.hh"
  35 #include "misc.hh"
  36 #include "program-option.hh"
  37 #include "relocate.hh"
  38 #include "string-convert.hh"
  39 #include "version.hh"
  40 #include "warn.hh"
  41
  42 LY_DEFINE (ly_start_environment, "ly:start-environment",
  43            0, 0, 0, (),
  44            "Return the environment (a list of strings) that was in"
  45            " effect at program start.")
  46 {
  47   SCM l = SCM_EOL;
  48   SCM *tail = &l;
  49
  50   for (vsize i = 0; i < start_environment_global.size (); i++)
  51     {
  52       *tail = scm_cons (ly_string2scm (start_environment_global[i]),
  53                         SCM_EOL);
  54       tail = SCM_CDRLOC(*tail);
  55     }
  56
  57   return l;
  58 }
  59
  60
  61 LY_DEFINE (ly_find_file, "ly:find-file",
  62            1, 0, 0, (SCM name),
  63            "Return the absolute file name of @var{name},"
  64            " or @code{#f} if not found.")
  65 {
  66   LY_ASSERT_TYPE (scm_is_string, name, 1);
  67
  68   string nm = ly_scm2string (name);
  69   string file_name = global_path.find (nm);
  70   if (file_name.empty ())
  71     return SCM_BOOL_F;
  72
  73   return ly_string2scm (file_name);
  74 }
  75
  76 /*
  77   Ugh. Gulped file is copied twice. (maybe thrice if you count stdio
  78   buffering.)
  79 */
  80 LY_DEFINE (ly_gulp_file, "ly:gulp-file",
  81            1, 1, 0, (SCM name, SCM size),
  82            "Read the file @var{name}, and return its contents in a string."
  83            "  The file is looked up using the search path.")
  84 {
  85   LY_ASSERT_TYPE (scm_is_string, name, 1);
  86   int sz = INT_MAX;
  87   if (size != SCM_UNDEFINED)
  88     {
  89       LY_ASSERT_TYPE (scm_is_number, size, 2);
  90       sz = scm_to_int (size);
  91     }
  92
  93   string contents = gulp_file_to_string (ly_scm2string (name), true, sz);
  94   return scm_from_locale_stringn (contents.c_str (), contents.length ());
  95 }
  96
  97 LY_DEFINE (ly_error, "ly:error",
  98            1, 0, 1, (SCM str, SCM rest),
  99            "A Scheme callable function to issue the error @var{str}."
 100            "  The error is formatted with @code{format} and @var{rest}.")
 101 {
 102   LY_ASSERT_TYPE (scm_is_string, str, 1);
 103   str = scm_simple_format (SCM_BOOL_F, str, rest);
 104   error (ly_scm2string (str));
 105   return SCM_UNSPECIFIED;
 106 }
 107
 108 LY_DEFINE (ly_message, "ly:message",
 109            1, 0, 1, (SCM str, SCM rest),
 110            "A Scheme callable function to issue the message @var{str}."
 111            "  The message is formatted with @code{format} and @var{rest}.")
 112 {
 113   LY_ASSERT_TYPE (scm_is_string, str, 1);
 114   str = scm_simple_format (SCM_BOOL_F, str, rest);
 115   message (ly_scm2string (str));
 116   return SCM_UNSPECIFIED;
 117 }
 118
 119 LY_DEFINE (ly_progress, "ly:progress",
 120            1, 0, 1, (SCM str, SCM rest),
 121            "A Scheme callable function to print progress @var{str}."
 122            "  The message is formatted with @code{format} and @var{rest}.")
 123 {
 124   LY_ASSERT_TYPE (scm_is_string, str, 1);
 125   str = scm_simple_format (SCM_BOOL_F, str, rest);
 126   progress_indication (ly_scm2string (str));
 127   return SCM_UNSPECIFIED;
 128 }
 129
 130 LY_DEFINE (ly_programming_error, "ly:programming-error",
 131            1, 0, 1, (SCM str, SCM rest),
 132            "A Scheme callable function to issue the internal warning"
 133            "  @var{str}.  The message is formatted with @code{format}"
 134            " and @var{rest}.")
 135 {
 136   LY_ASSERT_TYPE (scm_is_string, str, 1);
 137   str = scm_simple_format (SCM_BOOL_F, str, rest);
 138
 139   if (get_program_option ("warning-as-error"))
 140     error (ly_scm2string (str));
 141   else
 142     programming_error (ly_scm2string (str));
 143
 144   return SCM_UNSPECIFIED;
 145 }
 146
 147 LY_DEFINE (ly_success, "ly:success",
 148            1, 0, 1, (SCM str, SCM rest),
 149            "A Scheme callable function to issue a success message @var{str}."
 150            "  The message is formatted with @code{format} and @var{rest}.")
 151 {
 152   LY_ASSERT_TYPE (scm_is_string, str, 1);
 153   str = scm_simple_format (SCM_BOOL_F, str, rest);
 154   successful (ly_scm2string (str));
 155   return SCM_UNSPECIFIED;
 156
 157 }
 158 LY_DEFINE (ly_warning, "ly:warning",
 159            1, 0, 1, (SCM str, SCM rest),
 160            "A Scheme callable function to issue the warning @var{str}."
 161            "  The message is formatted with @code{format} and @var{rest}.")
 162 {
 163   LY_ASSERT_TYPE (scm_is_string, str, 1);
 164   str = scm_simple_format (SCM_BOOL_F, str, rest);
 165
 166   if (get_program_option ("warning-as-error"))
 167     error (ly_scm2string (str));
 168   else
 169     warning (ly_scm2string (str));
 170
 171   return SCM_UNSPECIFIED;
 172 }
 173
 174 LY_DEFINE (ly_dir_p, "ly:dir?",
 175            1, 0, 0, (SCM s),
 176            "Is @var{s} a direction?  Valid directions are @code{-1},"
 177            " @code{0}, or@tie{}@code{1}, where @code{-1} represents"
 178            " left or down, @code{1}@tie{}represents right or up, and @code{0}"
 179            " represents a neutral direction.")
 180 {
 181   if (scm_is_number (s))
 182     {
 183       int i = scm_to_int (s);
 184       return (i >= -1 && i <= 1) ? SCM_BOOL_T : SCM_BOOL_F;
 185     }
 186   return SCM_BOOL_F;
 187 }
 188
 189 LY_DEFINE (ly_assoc_get, "ly:assoc-get",
 190            2, 2, 0,
 191            (SCM key, SCM alist, SCM default_value, SCM strict_checking),
 192            "Return value if @var{key} in @var{alist}, else @var{default-value}"
 193            " (or @code{#f} if not specified).  If @var{strict-checking} is set"
 194            " to @code{#t} and @var{key} is not in @var{alist}, a programming_error"
 195            " is output.")
 196 {
 197   LY_ASSERT_TYPE(ly_cheap_is_list, alist, 2);
 198
 199   SCM handle = scm_assoc (key, alist);
 200   if (scm_is_pair (handle))
 201     return scm_cdr (handle);
 202
 203   if (default_value == SCM_UNDEFINED)
 204     default_value = SCM_BOOL_F;
 205
 206   if (strict_checking == SCM_BOOL_T)
 207     {
 208       string key_string = ly_scm2string
 209                             (scm_object_to_string (key, SCM_UNDEFINED));
 210       string default_value_string = ly_scm2string
 211                                       (scm_object_to_string (default_value,
 212                                                              SCM_UNDEFINED));
 213       programming_error ("Cannot find key `" +
 214                          key_string +
 215                          "' in alist, setting to `" +
 216                          default_value_string + "'.");
 217     }
 218
 219   return default_value;
 220 }
 221
 222 LY_DEFINE (ly_string_substitute, "ly:string-substitute",
 223            3, 0, 0, (SCM a, SCM b, SCM s),
 224            "Replace string@tie{}@var{a} by string@tie{}@var{b} in"
 225            " string@tie{}@var{s}.")
 226 {
 227   LY_ASSERT_TYPE (scm_is_string, s, 1);
 228   LY_ASSERT_TYPE (scm_is_string, b, 2);
 229   LY_ASSERT_TYPE (scm_is_string, s, 3);
 230
 231   string ss = ly_scm2string (s);
 232   replace_all (&ss, ly_scm2string (a),
 233                ly_scm2string (b));
 234
 235   return ly_string2scm (ss);
 236 }
 237
 238 bool
 239 is_not_escape_character (Byte c)
 240 {
 241   switch (c)
 242     {
 243     case '-':
 244     case '.':
 245     case '/':
 246     case '0'...'9':
 247     case ':':
 248     case 'A'...'Z':
 249     case '_':
 250     case 'a'...'z':
 251       return true;
 252     }
 253
 254   return false;
 255 }
 256
 257 LY_DEFINE (ly_string_percent_encode, "ly:string-percent-encode",
 258            1, 0, 0, (SCM str),
 259            "Encode all characters in string @var{str} with hexadecimal"
 260            " percent escape sequences, with the following exceptions:"
 261            " characters @code{-}, @code{.}, @code{/}, and @code{_}; and"
 262            " characters in ranges @code{0-9}, @code{A-Z}, and @code{a-z}.")
 263 {
 264   LY_ASSERT_TYPE (scm_is_string, str, 1);
 265
 266   string orig_str = ly_scm2string (str);
 267   string new_str = "";
 268
 269   vsize i = 0;
 270   vsize n = orig_str.size ();
 271
 272   while (i < n)
 273     {
 274       Byte cur = orig_str[i];
 275
 276       if (is_not_escape_character (cur))
 277         new_str += cur;
 278       else
 279         {
 280           new_str += '%';
 281           new_str += String_convert::bin2hex (cur);
 282         }
 283
 284       i++;
 285     }
 286
 287   return ly_string2scm (new_str);
 288 }
 289
 290 LY_DEFINE (ly_number_2_string, "ly:number->string",
 291            1, 0, 0, (SCM s),
 292            "Convert @var{num} to a string without generating many decimals.")
 293 {
 294   LY_ASSERT_TYPE (scm_is_number, s, 1);
 295
 296   char str[400];                        // ugh.
 297
 298   if (scm_exact_p (s) == SCM_BOOL_F)
 299     {
 300       Real r (scm_to_double (s));
 301         if (isinf (r) || isnan (r))
 302           {
 303             programming_error (_ ("infinity or NaN encountered while converting Real number"));
 304             programming_error (_ ("setting to zero"));
 305
 306             r = 0.0;
 307           }
 308
 309       snprintf (str, sizeof (str), "%.4f", r);
 310     }
 311   else
 312     snprintf (str, sizeof (str), "%d", int (scm_to_int (s)));
 313
 314   return scm_from_locale_string (str);
 315 }
 316
 317 LY_DEFINE (ly_version, "ly:version", 0, 0, 0, (),
 318            "Return the current lilypond version as a list, e.g.,"
 319            " @code{(1 3 127 uu1)}.")
 320 {
 321   char const *vs = "\'(" MAJOR_VERSION " " MINOR_VERSION " " PATCH_LEVEL " " MY_PATCH_LEVEL ")";
 322
 323   return scm_c_eval_string ((char *)vs);
 324 }
 325
 326 LY_DEFINE (ly_unit, "ly:unit", 0, 0, 0, (),
 327            "Return the unit used for lengths as a string.")
 328 {
 329   return scm_from_locale_string (INTERNAL_UNIT);
 330 }
 331
 332 LY_DEFINE (ly_dimension_p, "ly:dimension?", 1, 0, 0, (SCM d),
 333            "Return @var{d} as a number.  Used to distinguish length"
 334            " variables from normal numbers.")
 335 {
 336   return scm_number_p (d);
 337 }
 338
 339 /*
 340   Debugging mem leaks:
 341 */
 342 LY_DEFINE (ly_protects, "ly:protects",
 343            0, 0, 0, (),
 344            "Return hash of protected objects.")
 345 {
 346   return scm_protects;
 347 }
 348
 349 LY_DEFINE (ly_gettext, "ly:gettext",
 350            1, 0, 0, (SCM original),
 351            "A Scheme wrapper function for @code{gettext}.")
 352 {
 353   LY_ASSERT_TYPE (scm_is_string, original, 1);
 354   return ly_string2scm (_ (ly_scm2string (original).c_str ()));
 355 }
 356
 357 LY_DEFINE (ly_output_formats, "ly:output-formats",
 358            0, 0, 0, (),
 359            "Formats passed to @option{--format} as a list of strings,"
 360            " used for the output.")
 361 {
 362   vector<string> output_formats = string_split (output_format_global, ',');
 363
 364   SCM lst = SCM_EOL;
 365   int output_formats_count = output_formats.size ();
 366   for (int i = 0; i < output_formats_count; i++)
 367     lst = scm_cons (ly_string2scm (output_formats[i]), lst);
 368
 369   return lst;
 370 }
 371
 372 LY_DEFINE (ly_wide_char_2_utf_8, "ly:wide-char->utf-8",
 373            1, 0, 0, (SCM wc),
 374            "Encode the Unicode codepoint @var{wc}, an integer, as UTF-8.")
 375 {
 376   char buf[5];
 377
 378   LY_ASSERT_TYPE (scm_is_integer, wc, 1);
 379   unsigned wide_char = (unsigned) scm_to_int (wc);
 380   char *p = buf;
 381
 382   if (wide_char < 0x0080)
 383     *p++ = (char)wide_char;
 384   else if (wide_char < 0x0800)
 385     {
 386       *p++ = (char) (((wide_char >> 6)) | 0xC0);
 387       *p++ = (char) (((wide_char) & 0x3F) | 0x80);
 388     }
 389   else if (wide_char < 0x10000)
 390     {
 391       *p++ = (char) (((wide_char >> 12)) | 0xE0);
 392       *p++ = (char) (((wide_char >> 6) & 0x3F) | 0x80);
 393       *p++ = (char) (((wide_char) & 0x3F) | 0x80);
 394     }
 395   else
 396     {
 397       *p++ = (char) (((wide_char >> 18)) | 0xF0);
 398       *p++ = (char) (((wide_char >> 12) & 0x3F) | 0x80);
 399       *p++ = (char) (((wide_char >> 6) & 0x3F) | 0x80);
 400       *p++ = (char) (((wide_char) & 0x3F) | 0x80);
 401     }
 402   *p = 0;
 403
 404   return scm_from_locale_string (buf);
 405 }
 406
 407 LY_DEFINE (ly_effective_prefix, "ly:effective-prefix",
 408            0, 0, 0, (),
 409            "Return effective prefix.")
 410 {
 411   return ly_string2scm (lilypond_datadir);
 412 }
 413
 414 LY_DEFINE (ly_chain_assoc_get, "ly:chain-assoc-get",
 415            2, 2, 0, (SCM key, SCM achain, SCM default_value, SCM strict_checking),
 416            "Return value for @var{key} from a list of alists @var{achain}."
 417            "  If no entry is found, return @var{default-value} or @code{#f} if"
 418            " @var{default-value} is not specified.  With @var{strict-checking}"
 419            " set to @code{#t}, a programming_error is output in such cases.")
 420 {
 421   if (scm_is_pair (achain))
 422     {
 423       SCM handle = scm_assoc (key, scm_car (achain));
 424       if (scm_is_pair (handle))
 425         return scm_cdr (handle);
 426       else
 427         return ly_chain_assoc_get (key, scm_cdr (achain), default_value);
 428     }
 429
 430   if (strict_checking == SCM_BOOL_T)
 431     {
 432       string key_string = ly_scm2string
 433                             (scm_object_to_string (key, SCM_UNDEFINED));
 434       string default_value_string = ly_scm2string
 435                                       (scm_object_to_string (default_value,
 436                                                              SCM_UNDEFINED));
 437       programming_error ("Cannot find key `" +
 438                          key_string +
 439                          "' in achain, setting to `" +
 440                          default_value_string + "'.");
 441     }
 442
 443   return default_value == SCM_UNDEFINED ? SCM_BOOL_F : default_value;
 444 }
 445
 446
 447 LY_DEFINE (ly_stderr_redirect, "ly:stderr-redirect",
 448            1, 1, 0, (SCM file_name, SCM mode),
 449            "Redirect stderr to @var{file-name}, opened with @var{mode}.")
 450 {
 451   LY_ASSERT_TYPE (scm_is_string, file_name, 1);
 452
 453   string m = "w";
 454   FILE *stderrfile;
 455   if (mode != SCM_UNDEFINED && scm_string_p (mode))
 456     m = ly_scm2string (mode);
 457   /* dup2 and (fileno (current-error-port)) do not work with mingw'c
 458      gcc -mwindows.  */
 459   fflush (stderr);
 460   stderrfile = freopen (ly_scm2string (file_name).c_str (), m.c_str (), stderr);
 461   return SCM_UNSPECIFIED;
 462 }
 463
 464 static SCM
 465 accumulate_symbol (void * /* closure */,
 466                    SCM key,
 467                    SCM /* val */,
 468                    SCM result)
 469 {
 470   return scm_cons (key, result);
 471 }
 472
 473 LY_DEFINE (ly_hash_table_keys, "ly:hash-table-keys",
 474           1,0,0, (SCM tab),
 475           "Return a list of keys in @var{tab}.")
 476 {
 477   return scm_internal_hash_fold ((scm_t_hash_fold_fn) &accumulate_symbol,
 478                                  NULL, SCM_EOL, tab);
 479 }
 480
 481 LY_DEFINE (ly_camel_case_2_lisp_identifier, "ly:camel-case->lisp-identifier",
 482            1, 0, 0, (SCM name_sym),
 483            "Convert @code{FooBar_Bla} to @code{foo-bar-bla} style symbol.")
 484 {
 485   LY_ASSERT_TYPE (ly_is_symbol, name_sym, 1);
 486
 487   /*
 488     TODO: should use strings instead?
 489   */
 490
 491   const string in = ly_symbol2string (name_sym);
 492   string result = camel_case_to_lisp_identifier (in);
 493
 494   return ly_symbol2scm (result.c_str ());
 495 }
 496
 497 LY_DEFINE (ly_expand_environment, "ly:expand-environment",
 498            1, 0, 0, (SCM str),
 499            "Expand @code{$VAR} and @code{$@{VAR@}} in @var{str}.")
 500 {
 501   LY_ASSERT_TYPE (scm_is_string, str, 1);
 502
 503   return ly_string2scm (expand_environment_variables (ly_scm2string (str)));
 504 }
 505
 506
 507 LY_DEFINE (ly_truncate_list_x, "ly:truncate-list!",
 508            2, 0, 0, (SCM lst, SCM i),
 509            "Take at most the first @var{i} of list @var{lst}.")
 510 {
 511   LY_ASSERT_TYPE (scm_is_integer, i, 1);
 512
 513   int k = scm_to_int (i);
 514   if (k == 0)
 515     lst = SCM_EOL;
 516   else
 517     {
 518       SCM s = lst;
 519       k--;
 520       for (; scm_is_pair (s) && k--; s = scm_cdr (s))
 521         ;
 522
 523       if (scm_is_pair (s))
 524         scm_set_cdr_x (s, SCM_EOL);
 525     }
 526   return lst;
 527 }
 528
 529 string
 530 format_single_argument (SCM arg, int precision, bool escape = false)
 531 {
 532   if (scm_is_integer (arg) && scm_exact_p (arg) == SCM_BOOL_T)
 533     return (String_convert::int_string (scm_to_int (arg)));
 534   else if (scm_is_number (arg))
 535     {
 536       Real val = scm_to_double (arg);
 537
 538       if (isnan (val) || isinf (val))
 539         {
 540           warning (_ ("Found infinity or nan in output. Substituting 0.0"));
 541           return ("0.0");
 542           if (strict_infinity_checking)
 543             abort ();
 544         }
 545       else
 546         return (String_convert::form_string ("%.*lf", precision, val));
 547     }
 548   else if (scm_is_string (arg))
 549     {
 550       string s = ly_scm2string (arg);
 551       if (escape)
 552         {
 553           // Escape backslashes and double quotes, wrap it in double quotes
 554           replace_all (&s, "\\", "\\\\");
 555           replace_all (&s, "\"", "\\\"");
 556           // don't replace percents, since the png backend uses %d as escape sequence
 557           // replace_all (&s, "%", "\\%");
 558           replace_all (&s, "$", "\\$");
 559           s = "\"" + s + "\"";
 560         }
 561       return s;
 562     }
 563   else if (scm_is_symbol (arg))
 564     return (ly_symbol2string (arg));
 565   else
 566     {
 567       ly_progress (scm_from_locale_string ("Unsupported SCM value for format: ~a"),
 568                    scm_list_1 (arg));
 569     }
 570
 571
 572   return "";
 573 }
 574
 575 LY_DEFINE (ly_format, "ly:format",
 576            1, 0, 1, (SCM str, SCM rest),
 577            "LilyPond specific format, supporting @code{~a} and @code{~[0-9]f}."
 578            "  Basic support for @code{~s} is also provided.")
 579 {
 580   LY_ASSERT_TYPE (scm_is_string, str, 1);
 581
 582   string format = ly_scm2string (str);
 583   vector<string> results;
 584
 585   vsize i = 0;
 586   while (i < format.size ())
 587     {
 588       vsize tilde = format.find ('~', i);
 589
 590       results.push_back (format.substr (i, (tilde-i)));
 591
 592       if (tilde == NPOS)
 593         break ;
 594
 595       tilde ++;
 596
 597       char spec = format.at (tilde ++);
 598       if (spec == '~')
 599         results.push_back ("~");
 600       else
 601         {
 602           if (!scm_is_pair (rest))
 603             {
 604               programming_error (string (__FUNCTION__)
 605                                  + ": not enough arguments for format.");
 606               return ly_string2scm ("");
 607             }
 608
 609           SCM arg = scm_car (rest);
 610           rest = scm_cdr (rest);
 611
 612           int precision = 8;
 613
 614           if (spec == '$')
 615             precision = 2;
 616           else if (isdigit (spec))
 617             {
 618               precision = spec - '0';
 619               spec = format.at (tilde ++);
 620             }
 621
 622           if (spec == 'a' || spec == 'A' || spec == 'f' || spec == '$')
 623             results.push_back (format_single_argument (arg, precision));
 624           else if (spec == 's' || spec == 'S')
 625             results.push_back (format_single_argument (arg, precision, true));
 626           else if (spec == 'l')
 627             {
 628               SCM s = arg;
 629               for (; scm_is_pair (s); s = scm_cdr (s))
 630                 {
 631                   results.push_back (format_single_argument (scm_car (s), precision));
 632                   if (scm_cdr (s) != SCM_EOL)
 633                     results.push_back (" ");
 634                 }
 635
 636               if (s != SCM_EOL)
 637                 results.push_back (format_single_argument (s, precision));
 638
 639             }
 640         }
 641
 642       i = tilde;
 643     }
 644
 645   if (scm_is_pair (rest))
 646     programming_error (string (__FUNCTION__)
 647                        + ": too many arguments");
 648
 649   vsize len = 0;
 650   for (vsize i = 0; i < results.size (); i++)
 651     len += results[i].size ();
 652
 653   char *result = (char*) scm_malloc (len + 1);
 654   char *ptr = result;
 655   for (vsize i = 0; i < results.size (); i++)
 656     {
 657       strncpy (ptr, results[i].c_str (), results[i].size ());
 658       ptr += results[i].size ();
 659     }
 660   *ptr = '\0';
 661
 662   return scm_take_locale_stringn (result, len);
 663 }