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:
12 * The above copyright notice and this permission notice shall be included in all
13 * copies or substantial portions of the Software.
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
35 /* a copy from the lexer */
49 /* yes we need an extra flag since `#define FOO x` is not the same as `#define FOO() x` */
61 ppcondition *conditions;
65 #define ftepp_tokval(f) ((f)->lex->tok.value)
66 #define ftepp_ctx(f) ((f)->lex->tok.ctx)
68 static void ftepp_errorat(ftepp_t *ftepp, lex_ctx ctx, const char *fmt, ...)
75 con_vprintmsg(LVL_ERROR, ctx.file, ctx.line, "error", fmt, ap);
79 static void ftepp_error(ftepp_t *ftepp, const char *fmt, ...)
86 con_vprintmsg(LVL_ERROR, ftepp->lex->tok.ctx.file, ftepp->lex->tok.ctx.line, "error", fmt, ap);
90 ppmacro *ppmacro_new(lex_ctx ctx, const char *name)
92 ppmacro *macro = (ppmacro*)mem_a(sizeof(ppmacro));
93 memset(macro, 0, sizeof(*macro));
94 macro->name = util_strdup(name);
98 void ppmacro_delete(ppmacro *self)
100 vec_free(self->params);
101 vec_free(self->output);
106 ftepp_t* ftepp_init()
110 ftepp = (ftepp_t*)mem_a(sizeof(*ftepp));
111 memset(ftepp, 0, sizeof(*ftepp));
116 void ftepp_delete(ftepp_t *self)
118 vec_free(self->macros);
119 vec_free(self->conditions);
123 ppmacro* ftepp_macro_find(ftepp_t *ftepp, const char *name)
126 for (i = 0; i < vec_size(ftepp->macros); ++i) {
127 if (!strcmp(name, ftepp->macros[i]->name))
128 return ftepp->macros[i];
133 static inline int ftepp_next(ftepp_t *ftepp)
135 return (ftepp->token = lex_do(ftepp->lex));
138 /* Important: this does not skip newlines! */
139 static bool ftepp_skipspace(ftepp_t *ftepp)
141 if (ftepp->token != TOKEN_WHITE)
143 while (ftepp_next(ftepp) == TOKEN_WHITE) {}
144 if (ftepp->token >= TOKEN_EOF) {
145 ftepp_error(ftepp, "unexpected end of preprocessor directive");
152 * The huge macro parsing code...
154 static bool ftepp_define(ftepp_t *ftepp)
157 (void)ftepp_next(ftepp);
158 if (!ftepp_skipspace(ftepp))
161 switch (ftepp->token) {
165 macro = ppmacro_new(ftepp_ctx(ftepp), ftepp_tokval(ftepp));
168 ftepp_error(ftepp, "expected macro name");
172 (void)ftepp_next(ftepp);
173 if (!ftepp_skipspace(ftepp))
175 if (ftepp->token != TOKEN_EOL) {
176 ftepp_error(ftepp, "stray tokens after macro");
179 vec_push(ftepp->macros, macro);
184 * #if - the FTEQCC way:
185 * defined(FOO) => true if FOO was #defined regardless of parameters or contents
186 * <numbers> => True if the number is not 0
187 * !<factor> => True if the factor yields false
188 * <macro> => becomes the macro's FIRST token regardless of parameters
189 * <e> && <e> => True if both expressions are true
190 * <e> || <e> => True if either expression is true
192 * <ident> => False (remember for macros the <macro> rule applies instead)
193 * Unary + and - are skipped
194 * parenthesis in expressions are allowed
195 * parameter lists on macros are errors
196 * No mathematical calculations are executed
198 static bool ftepp_if_expr(ftepp_t *ftepp, bool *out)
201 while (ftepp->token != TOKEN_EOL) {
202 switch (ftepp->token) {
206 macro = ftepp_macro_find(ftepp, ftepp_tokval(ftepp));
207 if (!macro || !vec_size(macro->output)) {
210 /* This does not expand recursively! */
211 switch (macro->output[0]->token) {
213 *out = !!(macro->output[0]->constval.f);
215 case TOKEN_FLOATCONST:
216 *out = !!(macro->output[0]->constval.f);
224 case TOKEN_STRINGCONST:
228 *out = !!(ftepp->lex->tok.constval.i);
230 case TOKEN_FLOATCONST:
231 *out = !!(ftepp->lex->tok.constval.f);
235 ftepp_error(ftepp, "junk in #if");
240 if (!ftepp_skipspace(ftepp))
243 switch (ftepp->token) {
246 (void)ftepp_next(ftepp);
250 static bool ftepp_if(ftepp_t *ftepp, ppcondition *cond)
254 ftepp->lex->flags.noops = false;
256 memset(cond, 0, sizeof(*cond));
257 (void)ftepp_next(ftepp);
259 if (!ftepp_skipspace(ftepp))
261 if (ftepp->token == TOKEN_EOL) {
262 ftepp_error(ftepp, "expected expression for #if-directive");
266 if (!ftepp_if_expr(ftepp, &result))
268 ftepp->lex->flags.noops = true;
275 * ifdef is rather simple
277 static bool ftepp_ifdef(ftepp_t *ftepp, ppcondition *cond)
280 memset(cond, 0, sizeof(*cond));
281 (void)ftepp_next(ftepp);
282 if (!ftepp_skipspace(ftepp))
285 switch (ftepp->token) {
289 macro = ftepp_macro_find(ftepp, ftepp_tokval(ftepp));
292 ftepp_error(ftepp, "expected macro name");
296 (void)ftepp_next(ftepp);
297 if (!ftepp_skipspace(ftepp))
299 if (ftepp->token != TOKEN_EOL) {
300 ftepp_error(ftepp, "stray tokens after #ifdef");
307 /* Basic structure handlers */
308 static bool ftepp_else_allowed(ftepp_t *ftepp)
310 if (!vec_size(ftepp->conditions)) {
311 ftepp_error(ftepp, "#else without #if");
314 if (vec_last(ftepp->conditions).had_else) {
315 ftepp_error(ftepp, "multiple #else for a single #if");
321 static bool ftepp_hash(ftepp_t *ftepp)
326 lex_ctx ctx = ftepp_ctx(ftepp);
328 if (!ftepp_skipspace(ftepp))
331 switch (ftepp->token) {
335 if (!strcmp(ftepp_tokval(ftepp), "define")) {
336 return ftepp_define(ftepp);
338 else if (!strcmp(ftepp_tokval(ftepp), "ifdef")) {
339 if (!ftepp_ifdef(ftepp, &cond))
341 vec_push(ftepp->conditions, cond);
344 else if (!strcmp(ftepp_tokval(ftepp), "ifndef")) {
345 if (!ftepp_ifdef(ftepp, &cond))
348 vec_push(ftepp->conditions, cond);
351 else if (!strcmp(ftepp_tokval(ftepp), "elifdef")) {
352 if (!ftepp_else_allowed(ftepp))
354 if (!ftepp_ifdef(ftepp, &cond))
356 pc = &vec_last(ftepp->conditions);
357 pc->on = !pc->was_on && cond.on;
358 pc->was_on = pc->was_on || pc->on;
361 else if (!strcmp(ftepp_tokval(ftepp), "elifndef")) {
362 if (!ftepp_else_allowed(ftepp))
364 if (!ftepp_ifdef(ftepp, &cond))
367 pc = &vec_last(ftepp->conditions);
368 pc->on = !pc->was_on && cond.on;
369 pc->was_on = pc->was_on || pc->on;
372 else if (!strcmp(ftepp_tokval(ftepp), "elif")) {
373 if (!ftepp_else_allowed(ftepp))
375 if (!ftepp_if(ftepp, &cond))
377 pc = &vec_last(ftepp->conditions);
378 pc->on = !pc->was_on && cond.on;
379 pc->was_on = pc->was_on || pc->on;
382 else if (!strcmp(ftepp_tokval(ftepp), "if")) {
383 if (!ftepp_if(ftepp, &cond))
385 vec_push(ftepp->conditions, cond);
388 else if (!strcmp(ftepp_tokval(ftepp), "else")) {
389 if (!ftepp_else_allowed(ftepp))
391 pc = &vec_last(ftepp->conditions);
392 pc->on = !pc->was_on;
396 else if (!strcmp(ftepp_tokval(ftepp), "endif")) {
397 if (!vec_size(ftepp->conditions)) {
398 ftepp_error(ftepp, "#endif without #if");
401 vec_pop(ftepp->conditions);
405 ftepp_error(ftepp, "unrecognized preprocessor directive: `%s`", ftepp_tokval(ftepp));
410 ftepp_error(ftepp, "unexpected preprocessor token: `%s`", ftepp_tokval(ftepp));
413 ftepp_errorat(ftepp, ctx, "empty preprocessor directive");
416 ftepp_error(ftepp, "missing newline at end of file", ftepp_tokval(ftepp));
422 static void ftepp_out(ftepp_t *ftepp, const char *str)
424 if (!vec_size(ftepp->conditions) ||
425 vec_last(ftepp->conditions).on)
431 static bool ftepp_preprocess(ftepp_t *ftepp)
435 ftepp->lex->flags.preprocessing = true;
440 if (ftepp->token >= TOKEN_EOF)
443 ftepp->newline = newline;
446 switch (ftepp->token) {
448 if (!ftepp->newline) {
449 ftepp_out(ftepp, ftepp_tokval(ftepp));
453 if (ftepp_next(ftepp) >= TOKEN_EOF) {
454 ftepp_error(ftepp, "error in preprocessor directive");
455 ftepp->token = TOKEN_ERROR;
458 if (!ftepp_hash(ftepp))
459 ftepp->token = TOKEN_ERROR;
463 ftepp_out(ftepp, "\n");
467 ftepp_out(ftepp, ftepp_tokval(ftepp));
471 } while (!ftepp->errors && ftepp->token < TOKEN_EOF);
474 return (ftepp->token == TOKEN_EOF);
477 bool ftepp_preprocess_file(const char *filename)
479 ftepp_t *ftepp = ftepp_init();
480 ftepp->lex = lex_open(filename);
482 con_out("failed to open file \"%s\"\n", filename);
485 return ftepp_preprocess(ftepp);
488 bool ftepp_preprocess_string(const char *name, const char *str)
490 ftepp_t *ftepp = ftepp_init();
491 ftepp->lex = lex_open_string(str, strlen(str), name);
493 con_out("failed to create lexer for string \"%s\"\n", name);
496 return ftepp_preprocess(ftepp);