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970ed795 | 1 | /****************************************************************************** |
3abe9331 | 2 | * Copyright (c) 2000-2015 Ericsson Telecom AB |
970ed795 EL |
3 | * All rights reserved. This program and the accompanying materials |
4 | * are made available under the terms of the Eclipse Public License v1.0 | |
5 | * which accompanies this distribution, and is available at | |
6 | * http://www.eclipse.org/legal/epl-v10.html | |
7 | ******************************************************************************/ | |
8 | ||
9 | /* | |
10 | * bison language parser | |
11 | * | |
12 | * Written by Matyas Forstner using bison's parse-gram.y | |
13 | * 20050908 | |
14 | */ | |
15 | ||
16 | %{ | |
17 | ||
18 | /********************************************************************* | |
19 | * C(++) declarations | |
20 | *********************************************************************/ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <stdio.h> | |
24 | #include "../compiler2/string.hh" | |
25 | #include "error.h" | |
26 | #include "Grammar.hh" | |
27 | #include "Rule.hh" | |
28 | #include "Symbol.hh" | |
29 | #include "bison_p.tab.hh" | |
30 | ||
31 | extern int bison_lex(); | |
32 | extern FILE *bison_in; | |
33 | extern int bison_lineno; | |
34 | extern Grammar *grammar; | |
35 | static bool set_terminal; | |
36 | static bool set_firstsymbol; | |
37 | ||
38 | void yyerror(const char *s) | |
39 | { | |
40 | /* | |
41 | Location loc(asn1_infile, plineno); | |
42 | loc.error("%s", s); | |
43 | */ | |
44 | ERROR("parse error: %s at line %d\n", s, bison_lineno); | |
45 | } | |
46 | ||
47 | void yywarning(const char *s) | |
48 | { | |
49 | /* | |
50 | Location loc(asn1_infile, plineno); | |
51 | loc.warning("%s", s); | |
52 | */ | |
53 | WARNING("%s at line %d\n", s, bison_lineno); | |
54 | } | |
55 | ||
56 | ||
57 | %} | |
58 | ||
59 | /********************************************************************* | |
60 | * Bison declarations | |
61 | *********************************************************************/ | |
62 | ||
63 | %name-prefix="bison_" | |
64 | %output="bison_p.tab.cc" | |
65 | %defines | |
66 | %verbose | |
67 | ||
68 | /********************************************************************* | |
69 | * The union-type | |
70 | *********************************************************************/ | |
71 | ||
72 | %union { | |
73 | string *string_val; | |
74 | Symbol *symbol; | |
75 | Symbols *symbols; | |
76 | Rules *rules; | |
77 | } | |
78 | ||
79 | %token GRAM_EOF 0 "end of file" | |
80 | %token STRING "string" | |
81 | %token INT "integer" | |
82 | ||
83 | %token PERCENT_TOKEN "%token" | |
84 | %token PERCENT_NTERM "%nterm" | |
85 | ||
86 | %token PERCENT_TYPE "%type" | |
87 | %token PERCENT_DESTRUCTOR "%destructor {...}" | |
88 | %token PERCENT_PRINTER "%printer {...}" | |
89 | ||
90 | %token PERCENT_UNION "%union {...}" | |
91 | ||
92 | %token PERCENT_LEFT "%left" | |
93 | %token PERCENT_RIGHT "%right" | |
94 | %token PERCENT_NONASSOC "%nonassoc" | |
95 | ||
96 | %token PERCENT_PREC "%prec" | |
97 | %token PERCENT_DPREC "%dprec" | |
98 | %token PERCENT_MERGE "%merge" | |
99 | ||
100 | ||
101 | /*----------------------. | |
102 | | Global Declarations. | | |
103 | `----------------------*/ | |
104 | ||
105 | %token | |
106 | PERCENT_DEBUG "%debug" | |
107 | PERCENT_DEFAULT_PREC "%default-prec" | |
108 | PERCENT_DEFINE "%define" | |
109 | PERCENT_DEFINES "%defines" | |
110 | PERCENT_ERROR_VERBOSE "%error-verbose" | |
111 | PERCENT_EXPECT "%expect" | |
112 | PERCENT_EXPECT_RR "%expect-rr" | |
113 | PERCENT_FILE_PREFIX "%file-prefix" | |
114 | PERCENT_GLR_PARSER "%glr-parser" | |
115 | PERCENT_INITIAL_ACTION "%initial-action {...}" | |
116 | PERCENT_LEX_PARAM "%lex-param {...}" | |
117 | PERCENT_LOCATIONS "%locations" | |
118 | PERCENT_NAME_PREFIX "%name-prefix" | |
119 | PERCENT_NO_DEFAULT_PREC "%no-default-prec" | |
120 | PERCENT_NO_LINES "%no-lines" | |
121 | PERCENT_NONDETERMINISTIC_PARSER | |
122 | "%nondeterministic-parser" | |
123 | PERCENT_OUTPUT "%output" | |
124 | PERCENT_PARSE_PARAM "%parse-param {...}" | |
125 | PERCENT_PURE_PARSER "%pure-parser" | |
126 | PERCENT_SKELETON "%skeleton" | |
127 | PERCENT_START "%start" | |
128 | PERCENT_TOKEN_TABLE "%token-table" | |
129 | PERCENT_VERBOSE "%verbose" | |
130 | PERCENT_YACC "%yacc" | |
131 | ; | |
132 | ||
133 | %token TYPE "type" | |
134 | %token EQUAL "=" | |
135 | %token SEMICOLON ";" | |
136 | %token PIPE "|" | |
137 | %token ID "identifier" | |
138 | %token ID_COLON "identifier:" | |
139 | %token PERCENT_PERCENT "%%" | |
140 | %token PROLOGUE "%{...%}" | |
141 | %token EPILOGUE "epilogue" | |
142 | %token BRACED_CODE "{...}" | |
143 | ||
144 | ||
145 | /********************************************************************* | |
146 | * Semantic types of nonterminals | |
147 | *********************************************************************/ | |
148 | ||
149 | %type <string_val> STRING ID ID_COLON string_as_id | |
150 | %type <symbol> symbol | |
151 | %type <symbols> rhs | |
152 | %type <rules> rhses.1 | |
153 | ||
154 | %% | |
155 | ||
156 | /********************************************************************* | |
157 | * Grammar | |
158 | *********************************************************************/ | |
159 | ||
160 | input: | |
161 | declarations "%%" {set_firstsymbol=true;} grammar epilogue.opt | |
162 | ; | |
163 | ||
164 | /*------------------------------------. | |
165 | | Declarations: before the first %%. | | |
166 | `------------------------------------*/ | |
167 | ||
168 | declarations: | |
169 | /* Nothing */ | |
170 | | declarations declaration | |
171 | ; | |
172 | ||
173 | declaration: | |
174 | grammar_declaration | |
175 | | PROLOGUE | |
176 | | "%debug" | |
177 | | "%define" string_content string_content | |
178 | | "%defines" | |
179 | | "%error-verbose" | |
180 | | "%expect" INT | |
181 | | "%expect-rr" INT | |
182 | | "%file-prefix" "=" string_content | |
183 | | "%glr-parser" | |
184 | | "%initial-action {...}" | |
185 | | "%lex-param {...}" | |
186 | | "%locations" | |
187 | | "%name-prefix" "=" string_content | |
188 | | "%no-lines" | |
189 | | "%nondeterministic-parser" | |
190 | | "%output" "=" string_content | |
191 | | "%parse-param {...}" | |
192 | | "%pure-parser" | |
193 | | "%skeleton" string_content | |
194 | | "%token-table" | |
195 | | "%verbose" | |
196 | | "%yacc" | |
197 | | /*FIXME: Err? What is this horror doing here? */ ";" | |
198 | ; | |
199 | ||
200 | grammar_declaration: | |
201 | precedence_declaration | |
202 | | symbol_declaration | |
203 | | "%start" symbol | |
204 | { grammar->set_startsymbol($2); } | |
205 | | "%union {...}" | |
206 | | "%destructor {...}" {set_terminal=false;} symbols.1 | |
207 | | "%printer {...}" {set_terminal=false;} symbols.1 | |
208 | | "%default-prec" | |
209 | | "%no-default-prec" | |
210 | ; | |
211 | ||
212 | symbol_declaration: | |
213 | "%nterm" {set_terminal=false;} symbol_defs.1 | |
214 | { | |
215 | } | |
216 | | "%token" {set_terminal=true;} symbol_defs.1 | |
217 | { | |
218 | set_terminal=false; | |
219 | } | |
220 | | "%type" {set_terminal=false;} TYPE symbols.1 | |
221 | { | |
222 | } | |
223 | ; | |
224 | ||
225 | precedence_declaration: | |
226 | precedence_declarator {set_terminal=true;} type.opt symbols.1 | |
227 | { | |
228 | set_terminal=false; | |
229 | } | |
230 | ; | |
231 | ||
232 | precedence_declarator: | |
233 | "%left" | |
234 | | "%right" | |
235 | | "%nonassoc" | |
236 | ; | |
237 | ||
238 | type.opt: | |
239 | /* Nothing. */ { } | |
240 | | TYPE { } | |
241 | ; | |
242 | ||
243 | /* One or more nonterminals to be %typed. */ | |
244 | ||
245 | symbols.1: | |
246 | symbol { } | |
247 | | symbols.1 symbol { } | |
248 | ; | |
249 | ||
250 | /* One token definition. */ | |
251 | symbol_def: | |
252 | TYPE | |
253 | { | |
254 | } | |
255 | | ID | |
256 | { | |
257 | Symbol *s=grammar->get_symbol(*$1); | |
258 | if(set_terminal) s->set_is_terminal(); | |
259 | delete $1; | |
260 | } | |
261 | | ID INT | |
262 | { | |
263 | Symbol *s=grammar->get_symbol(*$1); | |
264 | if(set_terminal) s->set_is_terminal(); | |
265 | delete $1; | |
266 | } | |
267 | | ID string_as_id | |
268 | { | |
269 | grammar->add_alias(*$1, *$2); | |
270 | delete $1; delete $2; | |
271 | } | |
272 | | ID INT string_as_id | |
273 | { | |
274 | grammar->add_alias(*$1, *$3); | |
275 | delete $1; delete $3; | |
276 | } | |
277 | ; | |
278 | ||
279 | /* One or more symbol definitions. */ | |
280 | symbol_defs.1: | |
281 | symbol_def | |
282 | | symbol_defs.1 symbol_def | |
283 | ; | |
284 | ||
285 | ||
286 | /*------------------------------------------. | |
287 | | The grammar section: between the two %%. | | |
288 | `------------------------------------------*/ | |
289 | ||
290 | grammar: | |
291 | rules_or_grammar_declaration | |
292 | | grammar rules_or_grammar_declaration | |
293 | ; | |
294 | ||
295 | /* As a Bison extension, one can use the grammar declarations in the | |
296 | body of the grammar. */ | |
297 | rules_or_grammar_declaration: | |
298 | rules | |
299 | | grammar_declaration ";" | |
300 | | error ";" | |
301 | { | |
302 | yyerrok; | |
303 | } | |
304 | ; | |
305 | ||
306 | rules: | |
307 | ID_COLON rhses.1 | |
308 | { | |
309 | Symbol *s=grammar->get_symbol(*$1); | |
310 | grammar->add_grouping(new Grouping(s, $2)); | |
311 | delete $1; | |
312 | if(set_firstsymbol) { | |
313 | grammar->set_firstsymbol(s); | |
314 | set_firstsymbol=false; | |
315 | } | |
316 | } | |
317 | ; | |
318 | ||
319 | rhses.1: | |
320 | rhs { $$=new Rules(); $$->add_r(new Rule($1)); } | |
321 | | rhses.1 "|" rhs { $$=$1; $$->add_r(new Rule($3)); } | |
322 | | rhses.1 ";" { $$=$1; } | |
323 | ; | |
324 | ||
325 | rhs: | |
326 | /* Nothing. */ | |
327 | { $$=new Symbols(); } | |
328 | | rhs symbol | |
329 | { $$=$1; $$->add_s($2); } | |
330 | | rhs action | |
331 | { $$=$1; } | |
332 | | rhs "%prec" symbol | |
333 | { $$=$1; } | |
334 | | rhs "%dprec" INT | |
335 | { $$=$1; } | |
336 | | rhs "%merge" TYPE | |
337 | { $$=$1; } | |
338 | ; | |
339 | ||
340 | symbol: | |
341 | ID | |
342 | { | |
343 | $$=grammar->get_symbol(*$1); | |
344 | if(set_terminal) $$->set_is_terminal(); | |
345 | delete $1; | |
346 | } | |
347 | | string_as_id | |
348 | { | |
349 | $$=grammar->get_symbol(*$1); | |
350 | delete $1; | |
351 | } | |
352 | ; | |
353 | ||
354 | action: | |
355 | BRACED_CODE { } | |
356 | ; | |
357 | ||
358 | /* A string used as an ID: we have to keep the quotes. */ | |
359 | string_as_id: | |
360 | STRING { $$=$1; } | |
361 | ; | |
362 | ||
363 | /* A string used for its contents. Strip the quotes. */ | |
364 | string_content: | |
365 | STRING | |
366 | { | |
367 | delete $1; | |
368 | } | |
369 | ; | |
370 | ||
371 | epilogue.opt: | |
372 | /* Nothing. */ | |
373 | | "%%" EPILOGUE | |
374 | { | |
375 | } | |
376 | ; | |
377 | ||
378 | %% | |
379 | ||
380 | /********************************************************************* | |
381 | * Interface | |
382 | *********************************************************************/ | |
383 | ||
384 | int bison_parse_file(const char* filename) | |
385 | { | |
386 | bison_in = fopen(filename, "r"); | |
387 | if(bison_in == NULL) { | |
388 | FATAL_ERROR("Cannot open input file `%s': %s", filename, strerror(errno)); | |
389 | return -1; | |
390 | } | |
391 | ||
392 | int retval = yyparse(); | |
393 | ||
394 | fclose(bison_in); | |
395 | ||
396 | return retval; | |
397 | } |