compiler.l

   1 %{
   2 /*
   3
   4     Ann Hell Ex Machina - Music Software
   5     Copyright (C) 2003/2005 Angel Ortega <angel@triptico.com>
   6
   7     compiler.l - Scripting language [F]lex lexer
   8
   9     This program is free software; you can redistribute it and/or
  10     modify it under the terms of the GNU General Public License
  11     as published by the Free Software Foundation; either version 2
  12     of the License, or (at your option) any later version.
  13
  14     This program is distributed in the hope that it will be useful,
  15     but WITHOUT ANY WARRANTY; without even the implied warranty of
  16     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17     GNU General Public License for more details.
  18
  19     You should have received a copy of the GNU General Public License
  20     along with this program; if not, write to the Free Software
  21     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  22
  23     http://www.triptico.com
  24
  25 */
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <math.h>
  31 #include "y.tab.h"
  32
  33 void yyerror(char * s);
  34 int yy_input_for_flex(char * buf, int max);
  35
  36 /* the notes */
  37 static char * ascii_notes="ccddeffggaab";
  38
  39 /* redefinition of input function for GNU Flex */
  40 #undef YY_INPUT
  41 #define YY_INPUT(b,r,m) (r=yy_input_for_flex(b,m))
  42
  43 #define MAX_INPUTS 256
  44
  45 struct code_stack
  46 {
  47         char * code;    /* code string */
  48         int offset;     /* current offset */
  49         int times;      /* times to be fed to lexer/parser */
  50         int dyn;        /* if set, free() after usage */
  51 };
  52
  53 static struct code_stack code_stack[MAX_INPUTS];
  54 static int code_stack_i=-1;
  55
  56 /* dynamic string manipulation macros */
  57 #ifndef ds_init
  58 struct ds { char * d; int p; int s; };
  59 #define ds_init(x) do { x.d=(char *)0; x.p=x.s=0; } while(0)
  60 #define ds_rewind(x) x.p=0;
  61 #define ds_free(x) do { if(x.d) free(x.d); ds_init(x); } while(0)
  62 #define ds_redim(x) do { if(x.p >= x.s) x.d=realloc(x.d, x.s += 32); } while(0)
  63 #define ds_poke(x,c) do { ds_redim(x); x.d[x.p++]=c; } while(0)
  64 #define ds_pokes(x,t) do { char *p=t; while(*p) ds_poke(x, *p++); } while(0)
  65 #endif /* ds_init */
  66
  67 /* block dynstring */
  68 static struct ds ds_blk;
  69
  70 /* count of parentheses */
  71 static int ds_blk_i;
  72
  73 /* line number */
  74 int yyline=0;
  75
  76 %}
  77
  78 DIGIT           [0-9]
  79 P_INTEGER       {DIGIT}+
  80 S_INTEGER       [-+]{P_INTEGER}
  81 P_REAL          {DIGIT}*[\.]?{DIGIT}+
  82 S_REAL          [-+]{P_REAL}
  83
  84 NOTE_P          [a-g]
  85 NOTE_T3         \/3
  86 NOTE_T5         \/5
  87
  88 MARKNAME        [-a-zA-Z0-9_]+
  89 NEW_MARK        \^{MARKNAME}
  90 GOTO_MARK       @{MARKNAME}
  91 ASSERT_MARK     !{MARKNAME}
  92
  93 BLOCKNAME       [-a-zA-Z0-9_]+
  94
  95 WSPACE          [ \t]+
  96
  97 %x REM XC REMXC BLK
  98
  99 %%
 100
 101 {P_INTEGER}             {
 102                                 /* integers without sign */
 103                                 yylval.i=atoi(yytext);
 104                                 return(P_INTEGER);
 105                         }
 106 {S_INTEGER}             {
 107                                 /* signed integers */
 108                                 yylval.i=atoi(yytext);
 109                                 return(S_INTEGER);
 110                         }
 111 {P_REAL}                {
 112                                 /* real numbers without sign */
 113                                 yylval.d=atof(yytext);
 114                                 return(P_REAL);
 115                         }
 116 {S_REAL}                {
 117                                 /* signel real numbers */
 118                                 yylval.d=atof(yytext);
 119                                 return(S_REAL);
 120                         }
 121
 122 {NOTE_P}                {
 123                                 /* note pitch */
 124                                 yylval.i=strchr(ascii_notes, *yytext) - ascii_notes;
 125                                 return(NOTE_P);
 126                         }
 127 {NOTE_T3}               { return(NOTE_T3); }
 128 {NOTE_T5}               { return(NOTE_T5); }
 129
 130 {NEW_MARK}              {
 131                                 /* create new mark */
 132                                 yylval.p=yytext + 1;
 133                                 return(NEW_MARK);
 134                         }
 135 {GOTO_MARK}             {
 136                                 /* go to mark */
 137                                 yylval.p=yytext + 1;
 138                                 return(GOTO_MARK);
 139                         }
 140 {ASSERT_MARK}           {
 141                                 /* assert mark */
 142                                 yylval.p=yytext + 1;
 143                                 return(ASSERT_MARK);
 144                         }
 145
 146 {WSPACE}                { ; /* ignore blanks */ }
 147
 148 \n                      { yyline++; }
 149
 150 \/\*                    { BEGIN REM; /* C-like comments */ }
 151 <REM>\*\/               { BEGIN 0; }
 152 <REM>\n                 { yyline++; }
 153 <REM>.                  { ; /* drop anything inside a comment */ }
 154
 155 \{                      { BEGIN XC; /* start of extended commands */ }
 156 <XC>\"[^\"]*\"          {
 157                                 /* double-quoted string */
 158                                 yytext[yyleng - 1]='\0';
 159                                 yylval.p=strdup(yytext + 1);
 160                                 return(XC_STR);
 161                         }
 162 <XC>\'[^\']*\'          {
 163                                 /* single-quoted string */
 164                                 yytext[yyleng - 1]='\0';
 165                                 yylval.p=strdup(yytext + 1);
 166                                 return(XC_STR);
 167                         }
 168 <XC>{P_INTEGER}         {
 169                                 yylval.i=atoi(yytext);
 170                                 return(P_INTEGER);
 171                         }
 172 <XC>{S_INTEGER}         {
 173                                 yylval.i=atoi(yytext);
 174                                 return(S_INTEGER);
 175                         }
 176 <XC>{P_REAL}            {
 177                                 yylval.d=atof(yytext);
 178                                 return(P_REAL);
 179                         }
 180 <XC>{S_REAL}            {
 181                                 yylval.d=atof(yytext);
 182                                 return(S_REAL);
 183                         }
 184 <XC>{P_REAL}s           {
 185                                 /* frame count, in seconds */
 186                                 yytext[yyleng - 1]='\0';
 187                                 yylval.d=atof(yytext) * 1000;
 188                                 return(XC_MSECS);
 189                         }
 190 <XC>{P_REAL}ms          {
 191                                 /* frame count, in milliseconds */
 192                                 yytext[yyleng - 2]='\0';
 193                                 yylval.d=atof(yytext);
 194                                 return(XC_MSECS);
 195                         }
 196 <XC>{NOTE_P}[\#\&]?{P_INTEGER} {
 197                                 char * ptr=yytext;
 198
 199                                 /* process note */
 200                                 yylval.i=strchr(ascii_notes, *ptr) - ascii_notes;
 201                                 ptr++;
 202
 203                                 /* process optional sharps or flats */
 204                                 if(*ptr == '#')
 205                                 {
 206                                         yylval.i++;
 207                                         ptr++;
 208                                 }
 209                                 else
 210                                 if(*ptr == '&')
 211                                 {
 212                                         yylval.i--;
 213                                         ptr++;
 214                                 }
 215
 216                                 /* process octave */
 217                                 yylval.i += atoi(ptr) * 12;
 218
 219                                 return(XC_ABSNOTE);
 220                         }
 221
 222 <XC>wav                 { return(SS_WAV); }
 223 <XC>pat                 { return(SS_PAT); }
 224 <XC>sustain             { return(SS_SUSTAIN); }
 225 <XC>vibrato             { return(SS_VIBRATO); }
 226 <XC>channel             { return(SS_CHANNEL); }
 227 <XC>vol                 { return(SS_VOL); }
 228
 229 <XC>delay               { return(SS_EFF_DELAY); }
 230 <XC>echo                { return(SS_EFF_ECHO); }
 231 <XC>comb                { return(SS_EFF_COMB); }
 232 <XC>allpass             { return(SS_EFF_ALLPASS); }
 233 <XC>flanger             { return(SS_EFF_FLANGER); }
 234 <XC>wobble              { return(SS_EFF_WOBBLE); }
 235 <XC>square_wobble       { return(SS_EFF_SQWOBBLE); }
 236 <XC>fader               { return(SS_EFF_FADER); }
 237 <XC>reverb              { return(SS_EFF_REVERB); }
 238 <XC>off                 { return(SS_EFF_OFF); }
 239
 240 <XC>pitch_stretch       { return(SS_PITCH_STRETCH); }
 241 <XC>time_stretch        { return(SS_TIME_STRETCH); }
 242
 243 <XC>midi_channel        { return(MIDI_CHANNEL); }
 244 <XC>midi_program        { return(MIDI_PROGRAM); }
 245 <XC>midi_generic        { return(MIDI_GENERIC); }
 246
 247 <XC>\/\*                { BEGIN REMXC; /* C-like comments inside XC */ }
 248 <REMXC>\*\/             { BEGIN XC; /* jump back to XC processing */ }
 249 <REMXC>\n               { yyline++; }
 250 <REMXC>.                { ; }
 251
 252 <XC>\}                  { BEGIN 0; }
 253 <XC>{WSPACE}            { ; /* ignore blanks */ }
 254 <XC>\n                  { yyline++; }
 255 <XC>.                   { return(*yytext); }
 256
 257 \(                      {
 258                                 /* start of block */
 259                                 ds_init(ds_blk);
 260                                 ds_blk_i=1;
 261                                 BEGIN BLK;
 262                         }
 263 <BLK>\(                 { ds_blk_i++; ds_poke(ds_blk, *yytext); }
 264 <BLK>\)                 {
 265                                 /* one parentheses less */
 266                                 ds_blk_i--;
 267
 268                                 /* ok with block? */
 269                                 if(ds_blk_i == 0)
 270                                 {
 271                                         ds_poke(ds_blk, '\0');
 272                                         yylval.p=ds_blk.d;
 273
 274                                         BEGIN 0;
 275                                         return(BLOCK);
 276                                 }
 277                                 else
 278                                         ds_poke(ds_blk, ')');
 279                         }
 280 <BLK>\n                 { yyline++; }
 281 <BLK>.                  { ds_poke(ds_blk, *yytext); }
 282
 283 =[ \t\n]*{BLOCKNAME}    {
 284                                 /* block assignation */
 285                                 yylval.p=yytext + 1;
 286
 287                                 /* skip (possible) spaces between
 288                                    the = and the blockname; this lex
 289                                    rule is written this way to avoid
 290                                    having a global match for {BLOCKNAME},
 291                                    that could swallow notes and such,
 292                                    being mismatched as blocknames */
 293                                 while(*yylval.p == ' ' ||
 294                                       *yylval.p == '\n' ||
 295                                       *yylval.p == '\t')
 296                                         yylval.p++;
 297
 298                                 return(BLK_ASSIGN);
 299                         }
 300 \${BLOCKNAME}           {
 301                                 /* block insertion */
 302                                 yylval.p=yytext + 1;
 303                                 return(BLK_INSERT);
 304                         }
 305 `.+`                    {
 306                                 /* file inclusion */
 307                                 yytext[yyleng - 1]='\0';
 308                                 yylval.p=yytext + 1;
 309                                 return(FILE_INSERT);
 310                         }
 311
 312 .                       { return(*yytext); }
 313
 314 %%
 315
 316 int yywrap(void) { return(1); }
 317
 318 char * ds_load(char * file)
 319 {
 320         struct ds s;
 321         int c;
 322         FILE * f;
 323
 324         if((f=fopen(file, "r")) == NULL)
 325                 return(NULL);
 326
 327         ds_init(s);
 328
 329         while((c=fgetc(f)) != EOF)
 330                 ds_poke(s, c);
 331
 332         ds_poke(s, '\0');
 333         fclose(f);
 334
 335         return(s.d);
 336 }
 337
 338
 339 int push_code(char * code, int times, int dyn)
 340 {
 341         struct code_stack * cs;
 342
 343         if(code_stack_i == MAX_INPUTS)
 344                 return(0);
 345
 346         code_stack_i++;
 347         cs=&code_stack[code_stack_i];
 348
 349         cs->code=code;
 350         cs->offset=0;
 351         cs->times=times;
 352         cs->dyn=dyn;
 353
 354         return(1);
 355 }
 356
 357
 358 int push_code_from_file(char * file)
 359 {
 360         char * c;
 361
 362         if((c=ds_load(file)) == NULL)
 363                 return(0);
 364
 365         push_code(c, 1, 1);
 366         return(1);
 367 }
 368
 369
 370 int code_getchar(void)
 371 {
 372         struct code_stack * cs;
 373         int c='\0';
 374
 375         while(c == '\0' && code_stack_i > -1)
 376         {
 377                 /* get current char */
 378                 cs=&code_stack[code_stack_i];
 379                 c=cs->code[cs->offset++];
 380
 381                 /* end of code? */
 382                 if(c == '\0')
 383                 {
 384                         /* decrease times */
 385                         if(--cs->times)
 386                         {
 387                                 /* rewind */
 388                                 cs->offset=0;
 389                         }
 390                         else
 391                         {
 392                                 /* free if needed */
 393                                 if(cs->dyn)
 394                                         free(cs->code);
 395
 396                                 /* move to previous */
 397                                 code_stack_i--;
 398                         }
 399
 400                         /* in any case, return a separator */
 401                         c=' ';
 402                 }
 403         }
 404
 405         return(c);
 406 }
 407
 408
 409 int yy_input_for_flex(char * buf, int max)
 410 {
 411         buf[0]=code_getchar();
 412
 413         return(buf[0] == '\0' ? 0 : 1);
 414 }