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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(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                     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     /* free constants */
295     {
296                 size_t i = 0;
297                 for (; i < compile_constants_elements; i++) {
298                         mem_d(compile_constants_data[i].name);
299                         mem_d(compile_constants_data[i].string);
300                 }
301                 mem_d(compile_constants_data);
302         }
303     return 1;
304 }