parse.c

   1 /*
   2  * Copyright (C) 2012
   3  *      Dale Weiler
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a copy of
   6  * this software and associated documentation files (the "Software"), to deal in
   7  * the Software without restriction, including without limitation the rights to
   8  * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
   9  * of the Software, and to permit persons to whom the Software is furnished to do
  10  * so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in all
  13  * copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  */
  23 #include "gmqcc.h"
  24
  25 /* compile-time constant for type constants */
  26 typedef struct {
  27         char *name;
  28         int   type;
  29         float value[3];
  30         char *string; /* string value if constant is string literal */
  31 } constant;
  32 VECTOR_MAKE(constant, compile_constants);
  33
  34 void compile_constant_debug() {
  35         int iter = 0;
  36         for(; iter < compile_constants_elements; iter++) {
  37                 constant *c = &compile_constants_data[iter];
  38                 switch(c->type) {
  39                         case TYPE_FLOAT:  printf("constant: %s FLOAT   %f\n",       c->name, c->value[0]);                           break;
  40                         case TYPE_VECTOR: printf("constant: %s VECTOR {%f,%f,%f}\n",c->name, c->value[0], c->value[1], c->value[2]); break;
  41                         case TYPE_STRING: printf("constant: %s STRING  %s\n",       c->name, c->string); break;
  42                         case TYPE_VOID:   printf("constant: %s VOID    %s\n",       c->name, c->string); break;
  43                 }
  44         }
  45 }
  46
  47 /*
  48  * Generates a parse tree out of the lexees generated by the lexer.  This
  49  * is where the tree is built.  This is where valid check is performed.
  50  */
  51 int parse_gen(struct lex_file *file) {
  52         int     token = 0;
  53         while ((token = lex_token(file)) != ERROR_LEX && file->length >= 0) {
  54                 switch (token) {
  55                         case TOKEN_TYPEDEF: {
  56                                 char *f; /* from */
  57                                 char *t; /* to   */
  58
  59                                 token = lex_token(file);
  60                                 token = lex_token(file); f = util_strdup(file->lastok);
  61                                 token = lex_token(file);
  62                                 token = lex_token(file); t = util_strdup(file->lastok);
  63
  64                                 typedef_add(file, f, t);
  65                                 mem_d(f);
  66                                 mem_d(t);
  67
  68                                 token = lex_token(file);
  69                                 if (token == ' ')
  70                                         token = lex_token(file);
  71
  72                                 if (token != ';')
  73                                         error(file, ERROR_PARSE, "Expected a `;` at end of typedef statement");
  74
  75                                 token = lex_token(file);
  76                                 break;
  77                         }
  78
  79                         case TOKEN_VOID:   goto fall;
  80                         case TOKEN_STRING: goto fall;
  81                         case TOKEN_VECTOR: goto fall;
  82                         case TOKEN_ENTITY: goto fall;
  83                         case TOKEN_FLOAT:  goto fall;
  84                         {
  85                         fall:;
  86                                 char *name = NULL;
  87                                 int   type = token; /* story copy */
  88
  89                                 /* skip over space */
  90                                 token = lex_token(file);
  91                                 if (token == ' ')
  92                                         token = lex_token(file);
  93
  94                                 /* save name */
  95                                 name = util_strdup(file->lastok);
  96
  97                                 /* skip spaces */
  98                                 token = lex_token(file);
  99                                 if (token == ' ')
 100                                         token = lex_token(file);
 101
 102                                 if (token == ';') {
 103                                         /*
 104                                          * Definitions go to the defs table, they don't have
 105                                          * any sort of data with them yet.
 106                                          */
 107                                 } else if (token == '=') {
 108                                         token = lex_token(file);
 109                                         if (token == ' ')
 110                                                 token = lex_token(file);
 111
 112                                         /* strings are in file->lastok */
 113                                         switch (type) {
 114                                                 case TOKEN_VOID:
 115                                                         error(file, ERROR_PARSE, "Cannot assign value to type void\n");
 116
 117                                                 /* TODO: Validate (end quote), strip quotes for constant add, name constant */
 118                                                 case TOKEN_STRING:
 119                                                         if (*file->lastok != '"')
 120                                                                 error(file, ERROR_PARSE, "Expected a '\"' (quote) for string constant\n");
 121                                                         /* add the compile-time constant */
 122                                                         compile_constants_add((constant){
 123                                                                 .name   = util_strdup(name),
 124                                                                 .type   = TYPE_STRING,
 125                                                                 .value  = {0,0,0},
 126                                                                 .string = util_strdup(file->lastok)
 127                                                         });
 128                                                         break;
 129                                                 /* TODO: name constant, old qc vec literals, whitespace fixes, name constant */
 130                                                 case TOKEN_VECTOR: {
 131                                                         float compile_calc_x = 0;
 132                                                         float compile_calc_y = 0;
 133                                                         float compile_calc_z = 0;
 134                                                         int   compile_calc_d = 0; /* dot?        */
 135                                                         int   compile_calc_s = 0; /* sign (-, +) */
 136
 137                                                         char  compile_data[1024];
 138                                                         char *compile_eval = compile_data;
 139
 140                                                         if (token != '{')
 141                                                                 error(file, ERROR_PARSE, "Expected initializer list {} for vector constant\n");
 142
 143                                                         /*
 144                                                          * This parses a single vector element: x,y & z.  This will handle all the
 145                                                          * complicated mechanics of a vector, and can be extended as well.  This
 146                                                          * is a rather large macro, and is #undef'd after it's use below.
 147                                                          */
 148                                                         #define PARSE_VEC_ELEMENT(NAME, BIT)                                                                                                           \
 149                                                             token = lex_token(file);                                                                                                                   \
 150                                                             if (token == ' ')                                                                                                                          \
 151                                                                 token = lex_token(file);                                                                                                               \
 152                                                             if (token == '.')                                                                                                                          \
 153                                                                 compile_calc_d = 1;                                                                                                                    \
 154                                                             if (!isdigit(token) && !compile_calc_d && token != '+' && token != '-')                                                                    \
 155                                                                 error(file, ERROR_PARSE,"Invalid constant initializer element %c for vector, must be numeric\n", NAME);                                \
 156                                                             if (token == '+')                                                                                                                          \
 157                                                                 compile_calc_s = '+';                                                                                                                  \
 158                                                             if (token == '-' && !compile_calc_s)                                                                                                       \
 159                                                                 compile_calc_s = '-';                                                                                                                  \
 160                                                             while (isdigit(token) || token == '.' || token == '+' || token == '-') {                                                                   \
 161                                                                 *compile_eval++ = token;                                                                                                               \
 162                                                                 token           = lex_token(file);                                                                                                     \
 163                                                                 if (token == '.' && compile_calc_d) {                                                                                                  \
 164                                                                     error(file, ERROR_PARSE, "Invalid constant initializer element %c for vector, must be numeric.\n", NAME);                          \
 165                                                                     token = lex_token(file);                                                                                                           \
 166                                                                 }                                                                                                                                      \
 167                                                                 if ((token == '-' || token == '+') && compile_calc_s) {                                                                                \
 168                                                                     error(file, ERROR_PARSE, "Invalid constant initializer sign for vector element %c\n", NAME);                                       \
 169                                                                     token = lex_token(file);                                                                                                           \
 170                                                                 }                                                                                                                                      \
 171                                                                 else if (token == '.' && !compile_calc_d)                                                                                              \
 172                                                                     compile_calc_d = 1;                                                                                                                \
 173                                                                 else if (token == '-' && !compile_calc_s)                                                                                              \
 174                                                                     compile_calc_s = '-';                                                                                                              \
 175                                                                 else if (token == '+' && !compile_calc_s)                                                                                              \
 176                                                                     compile_calc_s = '+';                                                                                                              \
 177                                                             }                                                                                                                                          \
 178                                                             if (token == ' ')                                                                                                                          \
 179                                                                 token = lex_token(file);                                                                                                               \
 180                                                             if (NAME != 'z') {                                                                                                                         \
 181                                                                 if (token != ',' && token != ' ')                                                                                                      \
 182                                                                     error(file, ERROR_PARSE, "invalid constant initializer element %c for vector (missing spaces, or comma delimited list?)\n", NAME); \
 183                                                             } else if (token != '}') {                                                                                                                 \
 184                                                                 error(file, ERROR_PARSE, "Expected `}` on end of constant initialization for vector\n");                                               \
 185                                                             }                                                                                                                                          \
 186                                                             compile_calc_##BIT = atof(compile_data);                                                                                                   \
 187                                                             compile_calc_d = 0;                                                                                                                        \
 188                                                             compile_calc_s = 0;                                                                                                                        \
 189                                                             compile_eval   = &compile_data[0];                                                                                                         \
 190                                                             memset(compile_data, 0, sizeof(compile_data))
 191
 192                                                         /*
 193                                                          * Parse all elements using the macro above.
 194                                                          * We must undef the macro afterwards.
 195                                                          */
 196                                                         PARSE_VEC_ELEMENT('x', x);
 197                                                         PARSE_VEC_ELEMENT('y', y);
 198                                                         PARSE_VEC_ELEMENT('z', z);
 199                                                         #undef PARSE_VEC_ELEMENT
 200
 201                                                         /* Check for the semi-colon... */
 202                                                         token = lex_token(file);
 203                                                         if (token == ' ')
 204                                                                 token = lex_token(file);
 205                                                         if (token != ';')
 206                                                                 error(file, ERROR_PARSE, "Expected `;` on end of constant initialization for vector\n");
 207
 208                                                         /* add the compile-time constant */
 209                                                         compile_constants_add((constant){
 210                                                                 .name   = util_strdup(name),
 211                                                                 .type   = TYPE_VECTOR,
 212                                                                 .value  = {
 213                                                                         [0] = compile_calc_x,
 214                                                                         [1] = compile_calc_y,
 215                                                                         [2] = compile_calc_z
 216                                                                 },
 217                                                                 .string = NULL
 218                                                         });
 219                                                         break;
 220                                                 }
 221
 222                                                 case TOKEN_ENTITY:
 223                                                 case TOKEN_FLOAT: /*TODO: validate, constant generation, name constant */
 224                                                         if (!isdigit(token))
 225                                                                 error(file, ERROR_PARSE, "Expected numeric constant for float constant\n");
 226                                                         compile_constants_add((constant){
 227                                                                 .name   = util_strdup(name),
 228                                                                 .type   = TOKEN_FLOAT,
 229                                                                 .value  = {0,0,0},
 230                                                                 .string = NULL
 231                                                         });
 232                                                         break;
 233                                         }
 234                                 } else if (token == '(') {
 235                                         printf("FUNCTION ??\n");
 236                                 }
 237                                 mem_d(name);
 238                         }
 239
 240                         /*
 241                          * From here down is all language punctuation:  There is no
 242                          * need to actual create tokens from these because they're already
 243                          * tokenized as these individual tokens (which are in a special area
 244                          * of the ascii table which doesn't conflict with our other tokens
 245                          * which are higer than the ascii table.)
 246                          */
 247                         case '#':
 248                                 token = lex_token(file); /* skip '#' */
 249                                 if (token == ' ')
 250                                         token = lex_token(file);
 251                                 /*
 252                                  * If we make it here we found a directive, the supported
 253                                  * directives so far are #include.
 254                                  */
 255                                 if (strncmp(file->lastok, "include", sizeof("include")) == 0) {
 256                                         /*
 257                                          * We only suport include " ", not <> like in C (why?)
 258                                          * because the latter is silly.
 259                                          */
 260                                         while (*file->lastok != '"' && token != '\n')
 261                                                 token = lex_token(file);
 262                                         if (token == '\n')
 263                                                 return error(file, ERROR_PARSE, "Invalid use of include preprocessor directive: wanted #include \"file.h\"\n");
 264
 265                                         char            *copy = util_strdup(file->lastok);
 266                                         struct lex_file *next = lex_include(file,   copy);
 267
 268                                         if (!next) {
 269                                                 error(file, ERROR_INTERNAL, "Include subsystem failure\n");
 270                                                 exit (-1);
 271                                         }
 272                                         compile_constants_add((constant) {
 273                                                         .name   = "#include",
 274                                                         .type   = TYPE_VOID,
 275                                                         .value  = {0,0,0},
 276                                                         .string = copy
 277                                         });
 278                                         parse_gen(next);
 279                                         mem_d    (copy);
 280                                         lex_close(next);
 281                                 }
 282                                 /* skip all tokens to end of directive */
 283                                 while (token != '\n')
 284                                         token = lex_token(file);
 285                                 break;
 286
 287                         case LEX_IDENT:
 288                                 token = lex_token(file);
 289                                 break;
 290                 }
 291         }
 292         compile_constant_debug();
 293         lex_reset(file);
 294         return 1;
 295 }