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 * !!<factor> => ERROR on 2 or more unary nots
189 * <macro> => becomes the macro's FIRST token regardless of parameters
190 * <e> && <e> => True if both expressions are true
191 * <e> || <e> => True if either expression is true
193 * <ident> => False (remember for macros the <macro> rule applies instead)
194 * Unary + and - are weird and wrong in fteqcc so we don't allow them
195 * parenthesis in expressions are allowed
196 * parameter lists on macros are errors
197 * No mathematical calculations are executed
199 static bool ftepp_if_expr(ftepp_t *ftepp, bool *out)
204 if (!ftepp_skipspace(ftepp))
207 while (ftepp->token == '!') {
210 if (!ftepp_skipspace(ftepp))
214 switch (ftepp->token) {
218 if (!strcmp(ftepp_tokval(ftepp), "defined")) {
220 if (!ftepp_skipspace(ftepp))
222 if (ftepp->token != '(') {
223 ftepp_error(ftepp, "`defined` keyword in #if requires a macro name in parenthesis");
227 if (!ftepp_skipspace(ftepp))
229 if (ftepp->token != TOKEN_IDENT &&
230 ftepp->token != TOKEN_TYPENAME &&
231 ftepp->token != TOKEN_KEYWORD)
233 ftepp_error(ftepp, "defined() used on an unexpected token type");
236 macro = ftepp_macro_find(ftepp, ftepp_tokval(ftepp));
239 if (!ftepp_skipspace(ftepp))
241 if (ftepp->token != ')') {
242 ftepp_error(ftepp, "expected closing paren");
248 macro = ftepp_macro_find(ftepp, ftepp_tokval(ftepp));
249 if (!macro || !vec_size(macro->output)) {
252 /* This does not expand recursively! */
253 switch (macro->output[0]->token) {
255 *out = !!(macro->output[0]->constval.f);
257 case TOKEN_FLOATCONST:
258 *out = !!(macro->output[0]->constval.f);
266 case TOKEN_STRINGCONST:
270 *out = !!(ftepp->lex->tok.constval.i);
272 case TOKEN_FLOATCONST:
273 *out = !!(ftepp->lex->tok.constval.f);
278 if (!ftepp_if_expr(ftepp, out))
280 if (ftepp->token != ')') {
281 ftepp_error(ftepp, "expected closing paren in #if expression");
287 ftepp_error(ftepp, "junk in #if");
293 ftepp->lex->flags.noops = false;
295 if (!ftepp_skipspace(ftepp))
297 ftepp->lex->flags.noops = true;
299 if (ftepp->token == ')')
302 if (ftepp->token != TOKEN_OPERATOR)
305 if (!strcmp(ftepp_tokval(ftepp), "&&") ||
306 !strcmp(ftepp_tokval(ftepp), "||"))
309 char opc = ftepp_tokval(ftepp)[0];
312 if (!ftepp_if_expr(ftepp, &next))
322 ftepp_error(ftepp, "junk after #if");
327 static bool ftepp_if(ftepp_t *ftepp, ppcondition *cond)
331 memset(cond, 0, sizeof(*cond));
332 (void)ftepp_next(ftepp);
334 if (!ftepp_skipspace(ftepp))
336 if (ftepp->token == TOKEN_EOL) {
337 ftepp_error(ftepp, "expected expression for #if-directive");
341 if (!ftepp_if_expr(ftepp, &result))
349 * ifdef is rather simple
351 static bool ftepp_ifdef(ftepp_t *ftepp, ppcondition *cond)
354 memset(cond, 0, sizeof(*cond));
355 (void)ftepp_next(ftepp);
356 if (!ftepp_skipspace(ftepp))
359 switch (ftepp->token) {
363 macro = ftepp_macro_find(ftepp, ftepp_tokval(ftepp));
366 ftepp_error(ftepp, "expected macro name");
370 (void)ftepp_next(ftepp);
371 if (!ftepp_skipspace(ftepp))
373 if (ftepp->token != TOKEN_EOL) {
374 ftepp_error(ftepp, "stray tokens after #ifdef");
381 /* Basic structure handlers */
382 static bool ftepp_else_allowed(ftepp_t *ftepp)
384 if (!vec_size(ftepp->conditions)) {
385 ftepp_error(ftepp, "#else without #if");
388 if (vec_last(ftepp->conditions).had_else) {
389 ftepp_error(ftepp, "multiple #else for a single #if");
395 static bool ftepp_hash(ftepp_t *ftepp)
400 lex_ctx ctx = ftepp_ctx(ftepp);
402 if (!ftepp_skipspace(ftepp))
405 switch (ftepp->token) {
409 if (!strcmp(ftepp_tokval(ftepp), "define")) {
410 return ftepp_define(ftepp);
412 else if (!strcmp(ftepp_tokval(ftepp), "ifdef")) {
413 if (!ftepp_ifdef(ftepp, &cond))
415 cond.was_on = cond.on;
416 vec_push(ftepp->conditions, cond);
419 else if (!strcmp(ftepp_tokval(ftepp), "ifndef")) {
420 if (!ftepp_ifdef(ftepp, &cond))
423 cond.was_on = cond.on;
424 vec_push(ftepp->conditions, cond);
427 else if (!strcmp(ftepp_tokval(ftepp), "elifdef")) {
428 if (!ftepp_else_allowed(ftepp))
430 if (!ftepp_ifdef(ftepp, &cond))
432 pc = &vec_last(ftepp->conditions);
433 pc->on = !pc->was_on && cond.on;
434 pc->was_on = pc->was_on || pc->on;
437 else if (!strcmp(ftepp_tokval(ftepp), "elifndef")) {
438 if (!ftepp_else_allowed(ftepp))
440 if (!ftepp_ifdef(ftepp, &cond))
443 pc = &vec_last(ftepp->conditions);
444 pc->on = !pc->was_on && cond.on;
445 pc->was_on = pc->was_on || pc->on;
448 else if (!strcmp(ftepp_tokval(ftepp), "elif")) {
449 if (!ftepp_else_allowed(ftepp))
451 if (!ftepp_if(ftepp, &cond))
453 pc = &vec_last(ftepp->conditions);
454 pc->on = !pc->was_on && cond.on;
455 pc->was_on = pc->was_on || pc->on;
458 else if (!strcmp(ftepp_tokval(ftepp), "if")) {
459 if (!ftepp_if(ftepp, &cond))
461 cond.was_on = cond.on;
462 vec_push(ftepp->conditions, cond);
465 else if (!strcmp(ftepp_tokval(ftepp), "else")) {
466 if (!ftepp_else_allowed(ftepp))
468 pc = &vec_last(ftepp->conditions);
469 pc->on = !pc->was_on;
474 else if (!strcmp(ftepp_tokval(ftepp), "endif")) {
475 if (!vec_size(ftepp->conditions)) {
476 ftepp_error(ftepp, "#endif without #if");
479 vec_pop(ftepp->conditions);
484 ftepp_error(ftepp, "unrecognized preprocessor directive: `%s`", ftepp_tokval(ftepp));
489 ftepp_error(ftepp, "unexpected preprocessor token: `%s`", ftepp_tokval(ftepp));
492 ftepp_errorat(ftepp, ctx, "empty preprocessor directive");
495 ftepp_error(ftepp, "missing newline at end of file", ftepp_tokval(ftepp));
498 if (!ftepp_skipspace(ftepp))
503 static void ftepp_out(ftepp_t *ftepp, const char *str, bool ignore_cond)
506 !vec_size(ftepp->conditions) ||
507 vec_last(ftepp->conditions).on)
513 static bool ftepp_preprocess(ftepp_t *ftepp)
517 ftepp->lex->flags.preprocessing = true;
518 ftepp->lex->flags.noops = true;
523 if (ftepp->token >= TOKEN_EOF)
526 ftepp->newline = newline;
529 switch (ftepp->token) {
531 if (!ftepp->newline) {
532 ftepp_out(ftepp, ftepp_tokval(ftepp), false);
536 if (ftepp_next(ftepp) >= TOKEN_EOF) {
537 ftepp_error(ftepp, "error in preprocessor directive");
538 ftepp->token = TOKEN_ERROR;
541 if (!ftepp_hash(ftepp))
542 ftepp->token = TOKEN_ERROR;
546 ftepp_out(ftepp, "\n", true);
550 ftepp_out(ftepp, ftepp_tokval(ftepp), false);
554 } while (!ftepp->errors && ftepp->token < TOKEN_EOF);
557 return (ftepp->token == TOKEN_EOF);
560 bool ftepp_preprocess_file(const char *filename)
562 ftepp_t *ftepp = ftepp_init();
563 ftepp->lex = lex_open(filename);
565 con_out("failed to open file \"%s\"\n", filename);
568 return ftepp_preprocess(ftepp);
571 bool ftepp_preprocess_string(const char *name, const char *str)
573 ftepp_t *ftepp = ftepp_init();
574 ftepp->lex = lex_open_string(str, strlen(str), name);
576 con_out("failed to create lexer for string \"%s\"\n", name);
579 return ftepp_preprocess(ftepp);