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 <limits.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <ctype.h>
  27 #include "gmqcc.h"
  28
  29 /* compile-time constant for type constants */
  30 typedef struct {
  31         char *name;
  32         int   type;
  33         float value[3];
  34         char *string; /* string value if constant is string literal */
  35 } constant;
  36 VECTOR_MAKE(constant, compile_constants);
  37
  38 void compile_constant_debug() {
  39         int iter = 0;
  40         for(; iter < compile_constants_elements; iter++) {
  41                 constant *c = &compile_constants_data[iter];
  42                 switch(c->type) {
  43                         case TYPE_FLOAT:  printf("constant: %s FLOAT   %f\n",       c->name, c->value[0]);                           break;
  44                         case TYPE_VECTOR: printf("constant: %s VECTOR {%f,%f,%f}\n",c->name, c->value[0], c->value[1], c->value[2]); break;
  45                         case TYPE_STRING: printf("constant: %s STRING  %s\n",       c->name, c->string); break;
  46                         case TYPE_VOID:   printf("constant: %s VOID    %s\n",       c->name, c->string); break;
  47                 }
  48         }
  49 }
  50
  51 /*
  52  * Generates a parse tree out of the lexees generated by the lexer.  This
  53  * is where the tree is built.  This is where valid check is performed.
  54  */
  55 int parse_gen(struct lex_file *file) {
  56         int     token = 0;
  57         while ((token = lex_token(file)) != ERROR_LEX && file->length >= 0) {
  58                 switch (token) {
  59                         case TOKEN_TYPEDEF: {
  60                                 char *f; /* from */
  61                                 char *t; /* to   */
  62
  63                                 token = lex_token(file);
  64                                 token = lex_token(file); f = util_strdup(file->lastok);
  65                                 token = lex_token(file);
  66                                 token = lex_token(file); t = util_strdup(file->lastok);
  67
  68                                 typedef_add(file, f, t);
  69                                 mem_d(f);
  70                                 mem_d(t);
  71
  72                                 token = lex_token(file);
  73                                 if (token == ' ')
  74                                         token = lex_token(file);
  75
  76                                 if (token != ';')
  77                                         error(file, ERROR_PARSE, "Expected a `;` at end of typedef statement");
  78
  79                                 token = lex_token(file);
  80                                 break;
  81                         }
  82
  83                         case TOKEN_VOID:   goto fall;
  84                         case TOKEN_STRING: goto fall;
  85                         case TOKEN_VECTOR: goto fall;
  86                         case TOKEN_ENTITY: goto fall;
  87                         case TOKEN_FLOAT:  goto fall;
  88                         {
  89                         fall:;
  90                                 char *name = NULL;
  91                                 int   type = token; /* story copy */
  92
  93                                 /* skip over space */
  94                                 token = lex_token(file);
  95                                 if (token == ' ')
  96                                         token = lex_token(file);
  97
  98                                 /* save name */
  99                                 name = util_strdup(file->lastok);
 100
 101                                 /* skip spaces */
 102                                 token = lex_token(file);
 103                                 if (token == ' ')
 104                                         token = lex_token(file);
 105
 106                                 if (token == ';') {
 107                                         /*
 108                                          * Definitions go to the defs table, they don't have
 109                                          * any sort of data with them yet.
 110                                          */
 111                                 } else if (token == '=') {
 112                                         token = lex_token(file);
 113                                         if (token == ' ')
 114                                                 token = lex_token(file);
 115
 116                                         /* strings are in file->lastok */
 117                                         switch (type) {
 118                                                 case TOKEN_VOID:
 119                                                         error(file, ERROR_PARSE, "Cannot assign value to type void\n");
 120
 121                                                 /* TODO: Validate (end quote), strip quotes for constant add, name constant */
 122                                                 case TOKEN_STRING:
 123                                                         if (*file->lastok != '"')
 124                                                                 error(file, ERROR_PARSE, "Expected a '\"' (quote) for string constant\n");
 125                                                         /* add the compile-time constant */
 126                                                         compile_constants_add((constant){
 127                                                                 .name   = util_strdup(name),
 128                                                                 .type   = TYPE_STRING,
 129                                                                 .value  = {0,0,0},
 130                                                                 .string = util_strdup(file->lastok)
 131                                                         });
 132                                                         break;
 133                                                 /* TODO: name constant, old qc vec literals, whitespace fixes, name constant */
 134                                                 case TOKEN_VECTOR: {
 135                                                         float compile_calc_x = 0;
 136                                                         float compile_calc_y = 0;
 137                                                         float compile_calc_z = 0;
 138                                                         int   compile_calc_d = 0; /* dot?        */
 139                                                         int   compile_calc_s = 0; /* sign (-, +) */
 140
 141                                                         char  compile_data[1024];
 142                                                         char *compile_eval = compile_data;
 143
 144                                                         if (token != '{')
 145                                                                 error(file, ERROR_PARSE, "Expected initializer list {} for vector constant\n");
 146
 147                                                         /*
 148                                                          * This parses a single vector element: x,y & z.  This will handle all the
 149                                                          * complicated mechanics of a vector, and can be extended as well.  This
 150                                                          * is a rather large macro, and is #undef'd after it's use below.
 151                                                          */
 152                                                         #define PARSE_VEC_ELEMENT(NAME, BIT)                                                                                                           \
 153                                                             token = lex_token(file);                                                                                                                   \
 154                                                             if (token == ' ')                                                                                                                          \
 155                                                                 token = lex_token(file);                                                                                                               \
 156                                                             if (token == '.')                                                                                                                          \
 157                                                                 compile_calc_d = 1;                                                                                                                    \
 158                                                             if (!isdigit(token) && !compile_calc_d && token != '+' && token != '-')                                                                    \
 159                                                                 error(file, ERROR_PARSE,"Invalid constant initializer element %c for vector, must be numeric\n", NAME);                                \
 160                                                             if (token == '+')                                                                                                                          \
 161                                                                 compile_calc_s = '+';                                                                                                                  \
 162                                                             if (token == '-' && !compile_calc_s)                                                                                                       \
 163                                                                 compile_calc_s = '-';                                                                                                                  \
 164                                                             while (isdigit(token) || token == '.' || token == '+' || token == '-') {                                                                   \
 165                                                                 *compile_eval++ = token;                                                                                                               \
 166                                                                 token           = lex_token(file);                                                                                                     \
 167                                                                 if (token == '.' && compile_calc_d) {                                                                                                  \
 168                                                                     error(file, ERROR_PARSE, "Invalid constant initializer element %c for vector, must be numeric.\n", NAME);                          \
 169                                                                     token = lex_token(file);                                                                                                           \
 170                                                                 }                                                                                                                                      \
 171                                                                 if ((token == '-' || token == '+') && compile_calc_s) {                                                                                \
 172                                                                     error(file, ERROR_PARSE, "Invalid constant initializer sign for vector element %c\n", NAME);                                       \
 173                                                                     token = lex_token(file);                                                                                                           \
 174                                                                 }                                                                                                                                      \
 175                                                                 else if (token == '.' && !compile_calc_d)                                                                                              \
 176                                                                     compile_calc_d = 1;                                                                                                                \
 177                                                                 else if (token == '-' && !compile_calc_s)                                                                                              \
 178                                                                     compile_calc_s = '-';                                                                                                              \
 179                                                                 else if (token == '+' && !compile_calc_s)                                                                                              \
 180                                                                     compile_calc_s = '+';                                                                                                              \
 181                                                             }                                                                                                                                          \
 182                                                             if (token == ' ')                                                                                                                          \
 183                                                                 token = lex_token(file);                                                                                                               \
 184                                                             if (NAME != 'z') {                                                                                                                         \
 185                                                                 if (token != ',' && token != ' ')                                                                                                      \
 186                                                                     error(file, ERROR_PARSE, "invalid constant initializer element %c for vector (missing spaces, or comma delimited list?)\n", NAME); \
 187                                                             } else if (token != '}') {                                                                                                                 \
 188                                                                 error(file, ERROR_PARSE, "Expected `}` on end of constant initialization for vector\n");                                               \
 189                                                             }                                                                                                                                          \
 190                                                             compile_calc_##BIT = atof(compile_data);                                                                                                   \
 191                                                             compile_calc_d = 0;                                                                                                                        \
 192                                                             compile_calc_s = 0;                                                                                                                        \
 193                                                             compile_eval   = &compile_data[0];                                                                                                         \
 194                                                             memset(compile_data, 0, sizeof(compile_data))
 195
 196                                                         /*
 197                                                          * Parse all elements using the macro above.
 198                                                          * We must undef the macro afterwards.
 199                                                          */
 200                                                         PARSE_VEC_ELEMENT('x', x);
 201                                                         PARSE_VEC_ELEMENT('y', y);
 202                                                         PARSE_VEC_ELEMENT('z', z);
 203                                                         #undef PARSE_VEC_ELEMENT
 204
 205                                                         /* Check for the semi-colon... */
 206                                                         token = lex_token(file);
 207                                                         if (token == ' ')
 208                                                                 token = lex_token(file);
 209                                                         if (token != ';')
 210                                                                 error(file, ERROR_PARSE, "Expected `;` on end of constant initialization for vector\n");
 211
 212                                                         /* add the compile-time constant */
 213                                                         compile_constants_add((constant){
 214                                                                 .name   = util_strdup(name),
 215                                                                 .type   = TYPE_VECTOR,
 216                                                                 .value  = {
 217                                                                         [0] = compile_calc_x,
 218                                                                         [1] = compile_calc_y,
 219                                                                         [2] = compile_calc_z
 220                                                                 },
 221                                                                 .string = NULL
 222                                                         });
 223                                                         break;
 224                                                 }
 225
 226                                                 case TOKEN_ENTITY:
 227                                                 case TOKEN_FLOAT: /*TODO: validate, constant generation, name constant */
 228                                                         if (!isdigit(token))
 229                                                                 error(file, ERROR_PARSE, "Expected numeric constant for float constant\n");
 230                                                         compile_constants_add((constant){
 231                                                                 .name   = util_strdup(name),
 232                                                                 .type   = TOKEN_FLOAT,
 233                                                                 .value  = {0,0,0},
 234                                                                 .string = NULL
 235                                                         });
 236                                                         break;
 237                                         }
 238                                 } else if (token == '(') {
 239                                         printf("FUNCTION ??\n");
 240                                 }
 241                                 mem_d(name);
 242                         }
 243
 244                         /*
 245                          * From here down is all language punctuation:  There is no
 246                          * need to actual create tokens from these because they're already
 247                          * tokenized as these individual tokens (which are in a special area
 248                          * of the ascii table which doesn't conflict with our other tokens
 249                          * which are higer than the ascii table.)
 250                          */
 251                         case '#':
 252                                 token = lex_token(file); /* skip '#' */
 253                                 if (token == ' ')
 254                                         token = lex_token(file);
 255                                 /*
 256                                  * If we make it here we found a directive, the supported
 257                                  * directives so far are #include.
 258                                  */
 259                                 if (strncmp(file->lastok, "include", sizeof("include")) == 0) {
 260                                         /*
 261                                          * We only suport include " ", not <> like in C (why?)
 262                                          * because the latter is silly.
 263                                          */
 264                                         while (*file->lastok != '"' && token != '\n')
 265                                                 token = lex_token(file);
 266                                         if (token == '\n')
 267                                                 return error(file, ERROR_PARSE, "Invalid use of include preprocessor directive: wanted #include \"file.h\"\n");
 268
 269                                         char            *copy = util_strdup(file->lastok);
 270                                         struct lex_file *next = lex_include(file,   copy);
 271
 272                                         if (!next) {
 273                                                 error(file, ERROR_INTERNAL, "Include subsystem failure\n");
 274                                                 exit (-1);
 275                                         }
 276                                         compile_constants_add((constant) {
 277                                                         .name   = "#include",
 278                                                         .type   = TYPE_VOID,
 279                                                         .value  = {0,0,0},
 280                                                         .string = copy
 281                                         });
 282                                         parse_gen(next);
 283                                         mem_d    (copy);
 284                                         lex_close(next);
 285                                 }
 286                                 /* skip all tokens to end of directive */
 287                                 while (token != '\n')
 288                                         token = lex_token(file);
 289                                 break;
 290
 291                         case LEX_IDENT:
 292                                 token = lex_token(file);
 293                                 break;
 294                 }
 295         }
 296         compile_constant_debug();
 297         lex_reset(file);
 298         return 1;
 299 }