aboutsummaryrefslogtreecommitdiff
path: root/scripts/kconfig/lexer.l
blob: 6354c905b006f66e673d9b098c2ae50ef29271c4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
 */
%option nostdinit noyywrap never-interactive full ecs
%option 8bit nodefault yylineno
%x ASSIGN_VAL HELP STRING
%{

#include <assert.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "lkc.h"
#include "parser.tab.h"

#define YY_DECL		static int yylex1(void)

#define START_STRSIZE	16

static struct {
	struct file *file;
	int lineno;
} current_pos;

static int prev_prev_token = T_EOL;
static int prev_token = T_EOL;
static char *text;
static int text_size, text_asize;

struct buffer {
	struct buffer *parent;
	YY_BUFFER_STATE state;
};

struct buffer *current_buf;

static int last_ts, first_ts;

static char *expand_token(const char *in, size_t n);
static void append_expanded_string(const char *in);
static void zconf_endhelp(void);
static void zconf_endfile(void);

static void new_string(void)
{
	text = xmalloc(START_STRSIZE);
	text_asize = START_STRSIZE;
	text_size = 0;
	*text = 0;
}

static void append_string(const char *str, int size)
{
	int new_size = text_size + size + 1;
	if (new_size > text_asize) {
		new_size += START_STRSIZE - 1;
		new_size &= -START_STRSIZE;
		text = xrealloc(text, new_size);
		text_asize = new_size;
	}
	memcpy(text + text_size, str, size);
	text_size += size;
	text[text_size] = 0;
}

static void alloc_string(const char *str, int size)
{
	text = xmalloc(size + 1);
	memcpy(text, str, size);
	text[size] = 0;
}

static void warn_ignored_character(char chr)
{
	fprintf(stderr,
	        "%s:%d:warning: ignoring unsupported character '%c'\n",
	        current_file->name, yylineno, chr);
}
%}

n	[A-Za-z0-9_-]

%%
	int str = 0;
	int ts, i;

#.*			/* ignore comment */
[ \t]*			/* whitespaces */
\\\n			/* escaped new line */
\n			return T_EOL;
"allnoconfig_y"		return T_ALLNOCONFIG_Y;
"bool"			return T_BOOL;
"choice"		return T_CHOICE;
"comment"		return T_COMMENT;
"config"		return T_CONFIG;
"def_bool"		return T_DEF_BOOL;
"def_tristate"		return T_DEF_TRISTATE;
"default"		return T_DEFAULT;
"defconfig_list"	return T_DEFCONFIG_LIST;
"depends"		return T_DEPENDS;
"endchoice"		return T_ENDCHOICE;
"endif"			return T_ENDIF;
"endmenu"		return T_ENDMENU;
"help"|"---help---"	return T_HELP;
"hex"			return T_HEX;
"if"			return T_IF;
"imply"			return T_IMPLY;
"int"			return T_INT;
"mainmenu"		return T_MAINMENU;
"menu"			return T_MENU;
"menuconfig"		return T_MENUCONFIG;
"modules"		return T_MODULES;
"on"			return T_ON;
"option"		return T_OPTION;
"optional"		return T_OPTIONAL;
"prompt"		return T_PROMPT;
"range"			return T_RANGE;
"select"		return T_SELECT;
"source"		return T_SOURCE;
"string"		return T_STRING;
"tristate"		return T_TRISTATE;
"visible"		return T_VISIBLE;
"||"			return T_OR;
"&&"			return T_AND;
"="			return T_EQUAL;
"!="			return T_UNEQUAL;
"<"			return T_LESS;
"<="			return T_LESS_EQUAL;
">"			return T_GREATER;
">="			return T_GREATER_EQUAL;
"!"			return T_NOT;
"("			return T_OPEN_PAREN;
")"			return T_CLOSE_PAREN;
":="			return T_COLON_EQUAL;
"+="			return T_PLUS_EQUAL;
\"|\'			{
				str = yytext[0];
				new_string();
				BEGIN(STRING);
			}
{n}+			{
				alloc_string(yytext, yyleng);
				yylval.string = text;
				return T_WORD;
			}
({n}|$)+		{
				/* this token includes at least one '$' */
				yylval.string = expand_token(yytext, yyleng);
				if (strlen(yylval.string))
					return T_WORD;
				free(yylval.string);
			}
.			warn_ignored_character(*yytext);

<ASSIGN_VAL>{
	[^[:blank:]\n]+.*	{
		alloc_string(yytext, yyleng);
		yylval.string = text;
		return T_ASSIGN_VAL;
	}
	\n	{ BEGIN(INITIAL); return T_EOL; }
	.
}

<STRING>{
	"$".*	append_expanded_string(yytext);
	[^$'"\\\n]+	{
		append_string(yytext, yyleng);
	}
	\\.?	{
		append_string(yytext + 1, yyleng - 1);
	}
	\'|\"	{
		if (str == yytext[0]) {
			BEGIN(INITIAL);
			yylval.string = text;
			return T_WORD_QUOTE;
		} else
			append_string(yytext, 1);
	}
	\n	{
		fprintf(stderr,
			"%s:%d:warning: multi-line strings not supported\n",
			zconf_curname(), zconf_lineno());
		unput('\n');
		BEGIN(INITIAL);
		yylval.string = text;
		return T_WORD_QUOTE;
	}
	<<EOF>>	{
		BEGIN(INITIAL);
		yylval.string = text;
		return T_WORD_QUOTE;
	}
}

<HELP>{
	[ \t]+	{
		ts = 0;
		for (i = 0; i < yyleng; i++) {
			if (yytext[i] == '\t')
				ts = (ts & ~7) + 8;
			else
				ts++;
		}
		last_ts = ts;
		if (first_ts) {
			if (ts < first_ts) {
				zconf_endhelp();
				return T_HELPTEXT;
			}
			ts -= first_ts;
			while (ts > 8) {
				append_string("        ", 8);
				ts -= 8;
			}
			append_string("        ", ts);
		}
	}
	[ \t]*\n/[^ \t\n] {
		zconf_endhelp();
		return T_HELPTEXT;
	}
	[ \t]*\n	{
		append_string("\n", 1);
	}
	[^ \t\n].* {
		while (yyleng) {
			if ((yytext[yyleng-1] != ' ') && (yytext[yyleng-1] != '\t'))
				break;
			yyleng--;
		}
		append_string(yytext, yyleng);
		if (!first_ts)
			first_ts = last_ts;
	}
	<<EOF>>	{
		zconf_endhelp();
		return T_HELPTEXT;
	}
}

<<EOF>>	{
	BEGIN(INITIAL);

	if (prev_token != T_EOL && prev_token != T_HELPTEXT)
		fprintf(stderr, "%s:%d:warning: no new line at end of file\n",
			current_file->name, yylineno);

	if (current_file) {
		zconf_endfile();
		return T_EOL;
	}
	fclose(yyin);
	yyterminate();
}

%%

/* second stage lexer */
int yylex(void)
{
	int token;

repeat:
	token = yylex1();

	if (prev_token == T_EOL || prev_token == T_HELPTEXT) {
		if (token == T_EOL) {
			/* Do not pass unneeded T_EOL to the parser. */
			goto repeat;
		} else {
			/*
			 * For the parser, update file/lineno at the first token
			 * of each statement. Generally, \n is a statement
			 * terminator in Kconfig, but it is not always true
			 * because \n could be escaped by a backslash.
			 */
			current_pos.file = current_file;
			current_pos.lineno = yylineno;
		}
	}

	if (prev_prev_token == T_EOL && prev_token == T_WORD &&
	    (token == T_EQUAL || token == T_COLON_EQUAL || token == T_PLUS_EQUAL))
		BEGIN(ASSIGN_VAL);

	prev_prev_token = prev_token;
	prev_token = token;

	return token;
}

static char *expand_token(const char *in, size_t n)
{
	char *out;
	int c;
	char c2;
	const char *rest, *end;

	new_string();
	append_string(in, n);

	/* get the whole line because we do not know the end of token. */
	while ((c = input()) != EOF) {
		if (c == '\n') {
			unput(c);
			break;
		}
		c2 = c;
		append_string(&c2, 1);
	}

	rest = text;
	out = expand_one_token(&rest);

	/* push back unused characters to the input stream */
	end = rest + strlen(rest);
	while (end > rest)
		unput(*--end);

	free(text);

	return out;
}

static void append_expanded_string(const char *str)
{
	const char *end;
	char *res;

	str++;

	res = expand_dollar(&str);

	/* push back unused characters to the input stream */
	end = str + strlen(str);
	while (end > str)
		unput(*--end);

	append_string(res, strlen(res));

	free(res);
}

void zconf_starthelp(void)
{
	new_string();
	last_ts = first_ts = 0;
	BEGIN(HELP);
}

static void zconf_endhelp(void)
{
	yylval.string = text;
	BEGIN(INITIAL);
}


/*
 * Try to open specified file with following names:
 * ./name
 * $(srctree)/name
 * The latter is used when srctree is separate from objtree
 * when compiling the kernel.
 * Return NULL if file is not found.
 */
FILE *zconf_fopen(const char *name)
{
	char *env, fullname[PATH_MAX+1];
	FILE *f;

	f = fopen(name, "r");
	if (!f && name != NULL && name[0] != '/') {
		env = getenv(SRCTREE);
		if (env) {
			snprintf(fullname, sizeof(fullname),
				 "%s/%s", env, name);
			f = fopen(fullname, "r");
		}
	}
	return f;
}

void zconf_initscan(const char *name)
{
	yyin = zconf_fopen(name);
	if (!yyin) {
		fprintf(stderr, "can't find file %s\n", name);
		exit(1);
	}

	current_buf = xmalloc(sizeof(*current_buf));
	memset(current_buf, 0, sizeof(*current_buf));

	current_file = file_lookup(name);
	yylineno = 1;
}

void zconf_nextfile(const char *name)
{
	struct file *iter;
	struct file *file = file_lookup(name);
	struct buffer *buf = xmalloc(sizeof(*buf));
	memset(buf, 0, sizeof(*buf));

	current_buf->state = YY_CURRENT_BUFFER;
	yyin = zconf_fopen(file->name);
	if (!yyin) {
		fprintf(stderr, "%s:%d: can't open file \"%s\"\n",
			zconf_curname(), zconf_lineno(), file->name);
		exit(1);
	}
	yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
	buf->parent = current_buf;
	current_buf = buf;

	current_file->lineno = yylineno;
	file->parent = current_file;

	for (iter = current_file; iter; iter = iter->parent) {
		if (!strcmp(iter->name, file->name)) {
			fprintf(stderr,
				"Recursive inclusion detected.\n"
				"Inclusion path:\n"
				"  current file : %s\n", file->name);
			iter = file;
			do {
				iter = iter->parent;
				fprintf(stderr, "  included from: %s:%d\n",
					iter->name, iter->lineno - 1);
			} while (strcmp(iter->name, file->name));
			exit(1);
		}
	}

	yylineno = 1;
	current_file = file;
}

static void zconf_endfile(void)
{
	struct buffer *parent;

	current_file = current_file->parent;
	if (current_file)
		yylineno = current_file->lineno;

	parent = current_buf->parent;
	if (parent) {
		fclose(yyin);
		yy_delete_buffer(YY_CURRENT_BUFFER);
		yy_switch_to_buffer(parent->state);
	}
	free(current_buf);
	current_buf = parent;
}

int zconf_lineno(void)
{
	return current_pos.lineno;
}

const char *zconf_curname(void)
{
	return current_pos.file ? current_pos.file->name : "<none>";
}