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muscle: factor the computation of variable names
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1 /* Common parts between scan-code.l, scan-gram.l, and scan-skel.l.
2
3 Copyright (C) 2006, 2009-2013 Free Software Foundation, Inc.
4
5 This file is part of Bison, the GNU Compiler Compiler.
6
7 This program is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19
20 #ifndef FLEX_PREFIX
21 # error "FLEX_PREFIX not defined"
22 #endif
23
24 /* Flex full version as a number. */
25 #define FLEX_VERSION \
26 ((YY_FLEX_MAJOR_VERSION) * 1000000 \
27 + (YY_FLEX_MINOR_VERSION) * 1000 \
28 + (YY_FLEX_SUBMINOR_VERSION))
29
30 /* Pacify "gcc -Wmissing-prototypes" when flex 2.5.31 is used. */
31 #if FLEX_VERSION <= 2005031
32 int FLEX_PREFIX (get_lineno) (void);
33 FILE *FLEX_PREFIX (get_in) (void);
34 FILE *FLEX_PREFIX (get_out) (void);
35 int FLEX_PREFIX (get_leng) (void);
36 char *FLEX_PREFIX (get_text) (void);
37 void FLEX_PREFIX (set_lineno) (int);
38 void FLEX_PREFIX (set_in) (FILE *);
39 void FLEX_PREFIX (set_out) (FILE *);
40 int FLEX_PREFIX (get_debug) (void);
41 void FLEX_PREFIX (set_debug) (int);
42 int FLEX_PREFIX (lex_destroy) (void);
43 #endif
44
45 #define last_string FLEX_PREFIX (last_string)
46
47 /* It seems to be a nice "feature" of Flex that one cannot use yytext,
48 yyleng etc. when a prefix is given, since there is no longer a
49 #define, but rather the token is actually changed in the output.
50 However, this is not true for Flex 2.5.4. */
51 #ifndef yyleng
52 # define yyleng FLEX_PREFIX (leng)
53 #endif
54 #ifndef yytext
55 # define yytext FLEX_PREFIX (text)
56 #endif
57
58 /* Non-reentrant scanners generated by Flex 2.5.9 and later (and some earlier
59 versions according to the Flex manual) leak memory if yylex_destroy is not
60 invoked. However, yylex_destroy is not defined before Flex 2.5.9, so give
61 an implementation here that at least appears to work with Flex 2.5.4. */
62 #if FLEX_VERSION <= 2005009
63 # define yylex_destroy() yy_delete_buffer (YY_CURRENT_BUFFER)
64 #endif
65
66 /* OBSTACK_FOR_STRING -- Used to store all the characters that we need to
67 keep (to construct ID, STRINGS etc.). Use the following macros to
68 use it.
69
70 Use STRING_GROW to append what has just been matched, and
71 STRING_FINISH to end the string (it puts the ending 0).
72 STRING_FINISH also stores this string in LAST_STRING, which can be
73 used, and which is used by STRING_FREE to free the last string. */
74
75 #ifndef FLEX_NO_OBSTACK
76
77 static struct obstack obstack_for_string;
78
79 # define STRING_GROW \
80 obstack_grow (&obstack_for_string, yytext, yyleng)
81
82 # define STRING_FINISH \
83 (last_string = obstack_finish0 (&obstack_for_string))
84
85 # define STRING_FREE \
86 obstack_free (&obstack_for_string, last_string)
87
88 #endif