1 /* GNU m4 -- A simple macro processor
3 Copyright (C) 1989, 1990, 1991, 1992, 1993, 1994, 2004, 2005, 2006, 2007
4 Free Software Foundation, Inc.
6 This file is part of GNU M4.
8 GNU M4 is free software: you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
13 GNU M4 is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
22 /* Handling of different input sources, and lexical analysis. */
26 /* Unread input can be either files, that should be read (eg. included
27 files), strings, which should be rescanned (eg. macro expansion text),
28 or quoted macro definitions (as returned by the builtin "defn").
29 Unread input are organised in a stack, implemented with an obstack.
30 Each input source is described by a "struct input_block". The obstack
31 is "current_input". The top of the input stack is "isp".
33 The macro "m4wrap" places the text to be saved on another input
34 stack, on the obstack "wrapup_stack", whose top is "wsp". When EOF
35 is seen on normal input (eg, when "current_input" is empty), input is
36 switched over to "wrapup_stack", and the original "current_input" is
37 freed. A new stack is allocated for "wrapup_stack", which will
38 accept any text produced by calls to "m4wrap" from within the
39 wrapped text. This process of shuffling "wrapup_stack" to
40 "current_input" can continue indefinitely, even generating infinite
41 loops (e.g. "define(`f',`m4wrap(`f')')f"), without memory leaks.
43 Pushing new input on the input stack is done by push_file (),
44 push_string (), push_wrapup () (for wrapup text), and push_macro ()
45 (for macro definitions). Because macro expansion needs direct access
46 to the current input obstack (for optimisation), push_string () are
47 split in two functions, push_string_init (), which returns a pointer
48 to the current input stack, and push_string_finish (), which return a
49 pointer to the final text. The input_block *next is used to manage
50 the coordination between the different push routines.
52 The current file and line number are stored in two global
53 variables, for use by the error handling functions in m4.c. Macro
54 expansion wants to report the line where a macro name was detected,
55 rather than where it finished collecting arguments. This also
56 applies to text resulting from macro expansions. So each input
57 block maintains its own notion of the current file and line, and
58 swapping between input blocks updates the global variables
61 #ifdef ENABLE_CHANGEWORD
67 INPUT_STRING
, /* String resulting from macro expansion. */
68 INPUT_FILE
, /* File from command line or include. */
69 INPUT_MACRO
/* Builtin resulting from defn. */
72 typedef enum input_type input_type
;
76 struct input_block
*prev
; /* previous input_block on the input stack */
77 input_type type
; /* see enum values */
78 const char *file
; /* file where this input is from */
79 int line
; /* line where this input is from */
84 char *string
; /* remaining string value */
86 u_s
; /* INPUT_STRING */
89 FILE *fp
; /* input file handle */
90 bool_bitfield end
: 1; /* true if peek has seen EOF */
91 bool_bitfield close
: 1; /* true if we should close file on pop */
92 bool_bitfield advance
: 1; /* track previous start_of_input_line */
95 builtin_func
*func
; /* pointer to macro's function */
100 typedef struct input_block input_block
;
103 /* Current input file name. */
104 const char *current_file
;
106 /* Current input line number. */
109 /* Obstack for storing individual tokens. */
110 static struct obstack token_stack
;
112 /* Obstack for storing file names. */
113 static struct obstack file_names
;
115 /* Wrapup input stack. */
116 static struct obstack
*wrapup_stack
;
118 /* Current stack, from input or wrapup. */
119 static struct obstack
*current_input
;
121 /* Bottom of token_stack, for obstack_free. */
122 static void *token_bottom
;
124 /* Pointer to top of current_input. */
125 static input_block
*isp
;
127 /* Pointer to top of wrapup_stack. */
128 static input_block
*wsp
;
130 /* Aux. for handling split push_string (). */
131 static input_block
*next
;
133 /* Flag for next_char () to increment current_line. */
134 static bool start_of_input_line
;
136 /* Flag for next_char () to recognize change in input block. */
137 static bool input_change
;
139 #define CHAR_EOF 256 /* character return on EOF */
140 #define CHAR_MACRO 257 /* character return for MACRO token */
150 #ifdef ENABLE_CHANGEWORD
152 # define DEFAULT_WORD_REGEXP "[_a-zA-Z][_a-zA-Z0-9]*"
154 static char *word_start
;
155 static struct re_pattern_buffer word_regexp
;
156 static int default_word_regexp
;
157 static struct re_registers regs
;
159 #else /* !ENABLE_CHANGEWORD */
160 # define default_word_regexp 1
161 #endif /* !ENABLE_CHANGEWORD */
163 static bool pop_input (bool);
166 static const char *token_type_string (token_type
);
170 /*-------------------------------------------------------------------.
171 | push_file () pushes an input file on the input stack, saving the |
172 | current file name and line number. If next is non-NULL, this push |
173 | invalidates a call to push_string_init (), whose storage is |
174 | consequently released. If CLOSE, then close FP after EOF is |
176 `-------------------------------------------------------------------*/
179 push_file (FILE *fp
, const char *title
, bool close
)
185 obstack_free (current_input
, next
);
189 if (debug_level
& DEBUG_TRACE_INPUT
)
190 DEBUG_MESSAGE1 ("input read from %s", title
);
192 i
= (input_block
*) obstack_alloc (current_input
,
193 sizeof (struct input_block
));
194 i
->type
= INPUT_FILE
;
195 i
->file
= (char *) obstack_copy0 (&file_names
, title
, strlen (title
));
200 i
->u
.u_f
.end
= false;
201 i
->u
.u_f
.close
= close
;
202 i
->u
.u_f
.advance
= start_of_input_line
;
203 output_current_line
= -1;
209 /*---------------------------------------------------------------.
210 | push_macro () pushes a builtin macro's definition on the input |
211 | stack. If next is non-NULL, this push invalidates a call to |
212 | push_string_init (), whose storage is consequently released. |
213 `---------------------------------------------------------------*/
216 push_macro (builtin_func
*func
)
222 obstack_free (current_input
, next
);
226 i
= (input_block
*) obstack_alloc (current_input
,
227 sizeof (struct input_block
));
228 i
->type
= INPUT_MACRO
;
229 i
->file
= current_file
;
230 i
->line
= current_line
;
238 /*------------------------------------------------------------------.
239 | First half of push_string (). The pointer next points to the new |
241 `------------------------------------------------------------------*/
244 push_string_init (void)
246 /* Free any memory occupied by completely parsed strings. */
247 assert (next
== NULL
);
248 while (isp
&& pop_input (false));
250 /* Reserve the next location on the obstack. */
251 next
= (input_block
*) obstack_alloc (current_input
,
252 sizeof (struct input_block
));
253 next
->type
= INPUT_STRING
;
254 next
->file
= current_file
;
255 next
->line
= current_line
;
257 return current_input
;
260 /*------------------------------------------------------------------------.
261 | Last half of push_string (). If next is now NULL, a call to push_file |
262 | () has invalidated the previous call to push_string_init (), so we just |
263 | give up. If the new object is void, we do not push it. The function |
264 | push_string_finish () returns a pointer to the finished object. This |
265 | pointer is only for temporary use, since reading the next token might |
266 | release the memory used for the object. |
267 `------------------------------------------------------------------------*/
270 push_string_finish (void)
272 const char *ret
= NULL
;
277 if (obstack_object_size (current_input
) > 0)
279 obstack_1grow (current_input
, '\0');
280 next
->u
.u_s
.string
= (char *) obstack_finish (current_input
);
283 ret
= isp
->u
.u_s
.string
; /* for immediate use only */
287 obstack_free (current_input
, next
); /* people might leave garbage on it. */
292 /*------------------------------------------------------------------.
293 | The function push_wrapup () pushes a string on the wrapup stack. |
294 | When the normal input stack gets empty, the wrapup stack will |
295 | become the input stack, and push_string () and push_file () will |
296 | operate on wrapup_stack. Push_wrapup should be done as |
297 | push_string (), but this will suffice, as long as arguments to |
298 | m4_m4wrap () are moderate in size. |
299 `------------------------------------------------------------------*/
302 push_wrapup (const char *s
)
305 i
= (input_block
*) obstack_alloc (wrapup_stack
,
306 sizeof (struct input_block
));
308 i
->type
= INPUT_STRING
;
309 i
->file
= current_file
;
310 i
->line
= current_line
;
311 i
->u
.u_s
.string
= (char *) obstack_copy0 (wrapup_stack
, s
, strlen (s
));
316 /*-------------------------------------------------------------------.
317 | The function pop_input () pops one level of input sources. If |
318 | CLEANUP, and the popped input_block is a file, current_file and |
319 | current_line are reset to the saved values before the memory for |
320 | the input_block is released. The return value is false if cleanup |
321 | is still required, or if the current input source is not |
323 `-------------------------------------------------------------------*/
326 pop_input (bool cleanup
)
328 input_block
*tmp
= isp
->prev
;
333 assert (!cleanup
|| !*isp
->u
.u_s
.string
);
334 if (*isp
->u
.u_s
.string
)
346 if (debug_level
& DEBUG_TRACE_INPUT
)
349 DEBUG_MESSAGE2 ("input reverted to %s, line %d",
350 tmp
->file
, tmp
->line
);
352 DEBUG_MESSAGE ("input exhausted");
355 if (ferror (isp
->u
.u_f
.fp
))
357 m4_error (0, 0, NULL
, _("read error"));
358 if (isp
->u
.u_f
.close
)
359 fclose (isp
->u
.u_f
.fp
);
361 else if (isp
->u
.u_f
.close
&& fclose (isp
->u
.u_f
.fp
) == EOF
)
362 m4_error (0, errno
, NULL
, _("error reading file"));
363 start_of_input_line
= isp
->u
.u_f
.advance
;
364 output_current_line
= -1;
368 assert (!"pop_input");
371 obstack_free (current_input
, isp
);
372 next
= NULL
; /* might be set in push_string_init () */
379 /*------------------------------------------------------------------------.
380 | To switch input over to the wrapup stack, main () calls pop_wrapup (). |
381 | Since wrapup text can install new wrapup text, pop_wrapup () returns |
382 | false when there is no wrapup text on the stack, and true otherwise. |
383 `------------------------------------------------------------------------*/
389 obstack_free (current_input
, NULL
);
390 free (current_input
);
394 /* End of the program. Free all memory even though we are about
395 to exit, since it makes leak detection easier. */
396 obstack_free (&token_stack
, NULL
);
397 obstack_free (&file_names
, NULL
);
398 obstack_free (wrapup_stack
, NULL
);
403 current_input
= wrapup_stack
;
404 wrapup_stack
= (struct obstack
*) xmalloc (sizeof (struct obstack
));
405 obstack_init (wrapup_stack
);
414 /*-------------------------------------------------------------------.
415 | When a MACRO token is seen, next_token () uses init_macro_token () |
416 | to retrieve the value of the function pointer. |
417 `-------------------------------------------------------------------*/
420 init_macro_token (token_data
*td
)
422 assert (isp
->type
== INPUT_MACRO
);
423 TOKEN_DATA_TYPE (td
) = TOKEN_FUNC
;
424 TOKEN_DATA_FUNC (td
) = isp
->u
.func
;
428 /*------------------------------------------------------------------------.
429 | Low level input is done a character at a time. The function peek_input |
430 | () is used to look at the next character in the input stream. At any |
431 | given time, it reads from the input_block on the top of the current |
433 `------------------------------------------------------------------------*/
439 input_block
*block
= isp
;
449 ch
= to_uchar (block
->u
.u_s
.string
[0]);
455 ch
= getc (block
->u
.u_f
.fp
);
458 ungetc (ch
, block
->u
.u_f
.fp
);
461 block
->u
.u_f
.end
= true;
468 assert (!"peek_input");
475 /*-------------------------------------------------------------------------.
476 | The function next_char () is used to read and advance the input to the |
477 | next character. It also manages line numbers for error messages, so |
478 | they do not get wrong, due to lookahead. The token consisting of a |
479 | newline alone is taken as belonging to the line it ends, and the current |
480 | line number is not incremented until the next character is read. |
481 | 99.9% of all calls will read from a string, so factor that out into a |
483 `-------------------------------------------------------------------------*/
485 #define next_char() \
486 (isp && isp->type == INPUT_STRING && isp->u.u_s.string[0] \
488 ? to_uchar (*isp->u.u_s.string++) \
507 current_file
= isp
->file
;
508 current_line
= isp
->line
;
509 input_change
= false;
515 ch
= to_uchar (*isp
->u
.u_s
.string
);
524 if (start_of_input_line
)
526 start_of_input_line
= false;
527 current_line
= ++isp
->line
;
530 /* If stdin is a terminal, calling getc after peek_input
531 already called it would make the user have to hit ^D
533 ch
= isp
->u
.u_f
.end
? EOF
: getc (isp
->u
.u_f
.fp
);
537 start_of_input_line
= true;
543 /* INPUT_MACRO input sources has only one token */
548 assert (!"next_char_1");
552 /* End of input source --- pop one level. */
557 /*-------------------------------------------------------------------.
558 | skip_line () simply discards all immediately following characters, |
559 | up to the first newline. It is only used from m4_dnl (). |
560 `-------------------------------------------------------------------*/
563 skip_line (const char *name
)
566 const char *file
= current_file
;
567 int line
= current_line
;
569 while ((ch
= next_char ()) != CHAR_EOF
&& ch
!= '\n')
572 /* current_file changed to "" if we see CHAR_EOF, use the
573 previous value we stored earlier. */
574 m4_warn_at_line (0, file
, line
, name
,
575 _("end of file treated as newline"));
576 /* On the rare occasion that dnl crosses include file boundaries
577 (either the input file did not end in a newline, or changeword
578 was used), calling next_char can update current_file and
579 current_line, and that update will be undone as we return to
580 expand_macro. This informs next_char to fix things again. */
581 if (file
!= current_file
|| line
!= current_line
)
586 /*------------------------------------------------------------------.
587 | This function is for matching a string against a prefix of the |
588 | input stream. If the string matches the input and consume is |
589 | true, the input is discarded; otherwise any characters read are |
590 | pushed back again. The function is used only when multicharacter |
591 | quotes or comment delimiters are used. |
592 `------------------------------------------------------------------*/
595 match_input (const char *s
, bool consume
)
597 int n
; /* number of characters matched */
598 int ch
; /* input character */
603 if (ch
!= to_uchar (*s
))
604 return false; /* fail */
610 return true; /* short match */
614 for (n
= 1, t
= s
++; (ch
= peek_input ()) == to_uchar (*s
++); )
618 if (*s
== '\0') /* long match */
627 /* Failed or shouldn't consume, push back input. */
629 obstack_grow (current_input
, t
, n
);
630 push_string_finish ();
634 /*--------------------------------------------------------------------.
635 | The macro MATCH() is used to match a string S against the input. |
636 | The first character is handled inline, for speed. Hopefully, this |
637 | will not hurt efficiency too much when single character quotes and |
638 | comment delimiters are used. If CONSUME, then CH is the result of |
639 | next_char, and a successful match will discard the matched string. |
640 | Otherwise, CH is the result of peek_char, and the input stream is |
641 | effectively unchanged. |
642 `--------------------------------------------------------------------*/
644 #define MATCH(ch, s, consume) \
645 (to_uchar ((s)[0]) == (ch) \
647 && ((s)[1] == '\0' || (match_input ((s) + (consume), consume))))
650 /*----------------------------------------------------------.
651 | Inititialise input stacks, and quote/comment characters. |
652 `----------------------------------------------------------*/
660 current_input
= (struct obstack
*) xmalloc (sizeof (struct obstack
));
661 obstack_init (current_input
);
662 wrapup_stack
= (struct obstack
*) xmalloc (sizeof (struct obstack
));
663 obstack_init (wrapup_stack
);
665 obstack_init (&file_names
);
667 /* Allocate an object in the current chunk, so that obstack_free
668 will always work even if the first token parsed spills to a new
670 obstack_init (&token_stack
);
671 obstack_alloc (&token_stack
, 1);
672 token_bottom
= obstack_base (&token_stack
);
678 start_of_input_line
= false;
680 lquote
.string
= xstrdup (DEF_LQUOTE
);
681 lquote
.length
= strlen (lquote
.string
);
682 rquote
.string
= xstrdup (DEF_RQUOTE
);
683 rquote
.length
= strlen (rquote
.string
);
684 bcomm
.string
= xstrdup (DEF_BCOMM
);
685 bcomm
.length
= strlen (bcomm
.string
);
686 ecomm
.string
= xstrdup (DEF_ECOMM
);
687 ecomm
.length
= strlen (ecomm
.string
);
689 #ifdef ENABLE_CHANGEWORD
690 set_word_regexp (NULL
, user_word_regexp
);
695 /*------------------------------------------------------------------.
696 | Functions for setting quotes and comment delimiters. Used by |
697 | m4_changecom () and m4_changequote (). Pass NULL if the argument |
698 | was not present, to distinguish from an explicit empty string. |
699 `------------------------------------------------------------------*/
702 set_quotes (const char *lq
, const char *rq
)
704 free (lquote
.string
);
705 free (rquote
.string
);
707 /* POSIX states that with 0 arguments, the default quotes are used.
708 POSIX XCU ERN 112 states that behavior is implementation-defined
709 if there was only one argument, or if there is an empty string in
710 either position when there are two arguments. We allow an empty
711 left quote to disable quoting, but a non-empty left quote will
712 always create a non-empty right quote. See the texinfo for what
713 some other implementations do. */
719 else if (!rq
|| (*lq
&& !*rq
))
722 lquote
.string
= xstrdup (lq
);
723 lquote
.length
= strlen (lquote
.string
);
724 rquote
.string
= xstrdup (rq
);
725 rquote
.length
= strlen (rquote
.string
);
729 set_comment (const char *bc
, const char *ec
)
734 /* POSIX requires no arguments to disable comments. It requires
735 empty arguments to be used as-is, but this is counter to
736 traditional behavior, because a non-null begin and null end makes
737 it impossible to end a comment. An aardvark has been filed:
738 http://www.opengroup.org/austin/mailarchives/ag-review/msg02168.html
739 This implementation assumes the aardvark will be approved. See
740 the texinfo for what some other implementations do. */
743 else if (!ec
|| (*bc
&& !*ec
))
746 bcomm
.string
= xstrdup (bc
);
747 bcomm
.length
= strlen (bcomm
.string
);
748 ecomm
.string
= xstrdup (ec
);
749 ecomm
.length
= strlen (ecomm
.string
);
752 #ifdef ENABLE_CHANGEWORD
755 set_word_regexp (const char *caller
, const char *regexp
)
760 struct re_pattern_buffer new_word_regexp
;
762 if (!*regexp
|| !strcmp (regexp
, DEFAULT_WORD_REGEXP
))
764 default_word_regexp
= true;
768 /* Dry run to see whether the new expression is compilable. */
769 init_pattern_buffer (&new_word_regexp
, NULL
);
770 msg
= re_compile_pattern (regexp
, strlen (regexp
), &new_word_regexp
);
771 regfree (&new_word_regexp
);
775 /* FIXME - report on behalf of macro caller. */
776 m4_warn (0, caller
, _("bad regular expression `%s': %s"), regexp
, msg
);
780 /* If compilation worked, retry using the word_regexp struct.
781 Can't rely on struct assigns working, so redo the compilation. */
782 regfree (&word_regexp
);
783 msg
= re_compile_pattern (regexp
, strlen (regexp
), &word_regexp
);
785 re_set_registers (&word_regexp
, ®s
, regs
.num_regs
, regs
.start
, regs
.end
);
787 default_word_regexp
= false;
789 if (word_start
== NULL
)
790 word_start
= (char *) xmalloc (256);
792 word_start
[0] = '\0';
794 for (i
= 1; i
< 256; i
++)
797 word_start
[i
] = re_search (&word_regexp
, test
, 1, 0, 0, NULL
) >= 0;
801 #endif /* ENABLE_CHANGEWORD */
804 /*--------------------------------------------------------------------.
805 | Parse and return a single token from the input stream. A token |
806 | can either be TOKEN_EOF, if the input_stack is empty; it can be |
807 | TOKEN_STRING for a quoted string; TOKEN_WORD for something that is |
808 | a potential macro name; and TOKEN_SIMPLE for any single character |
809 | that is not a part of any of the previous types. If LINE is not |
810 | NULL, set *LINE to the line where the token starts. Report errors |
811 | (unterminated comments or strings) on behalf of CALLER, if |
814 | Next_token () returns the token type, and passes back a pointer to |
815 | the token data through TD. The token text is collected on the |
816 | obstack token_stack, which never contains more than one token text |
817 | at a time. The storage pointed to by the fields in TD is |
818 | therefore subject to change the next time next_token () is called. |
819 `--------------------------------------------------------------------*/
822 next_token (token_data
*td
, int *line
, const char *caller
)
827 #ifdef ENABLE_CHANGEWORD
829 char *orig_text
= NULL
;
834 obstack_free (&token_stack
, token_bottom
);
838 /* Can't consume character until after CHAR_MACRO is handled. */
843 xfprintf (stderr
, "next_token -> EOF\n");
848 if (ch
== CHAR_MACRO
)
850 init_macro_token (td
);
853 xfprintf (stderr
, "next_token -> MACDEF (%s)\n",
854 find_builtin_by_addr (TOKEN_DATA_FUNC (td
))->name
);
859 next_char (); /* Consume character we already peeked at. */
861 *line
= current_line
;
862 if (MATCH (ch
, bcomm
.string
, true))
864 obstack_grow (&token_stack
, bcomm
.string
, bcomm
.length
);
865 while ((ch
= next_char ()) != CHAR_EOF
866 && !MATCH (ch
, ecomm
.string
, true))
867 obstack_1grow (&token_stack
, ch
);
869 obstack_grow (&token_stack
, ecomm
.string
, ecomm
.length
);
871 /* current_file changed to "" if we see CHAR_EOF, use the
872 previous value we stored earlier. */
873 m4_error_at_line (EXIT_FAILURE
, 0, file
, *line
, caller
,
874 _("end of file in comment"));
878 else if (default_word_regexp
&& (isalpha (ch
) || ch
== '_'))
880 obstack_1grow (&token_stack
, ch
);
881 while ((ch
= peek_input ()) != CHAR_EOF
&& (isalnum (ch
) || ch
== '_'))
883 obstack_1grow (&token_stack
, ch
);
889 #ifdef ENABLE_CHANGEWORD
891 else if (!default_word_regexp
&& word_start
[ch
])
893 obstack_1grow (&token_stack
, ch
);
899 obstack_1grow (&token_stack
, ch
);
900 startpos
= re_search (&word_regexp
,
901 (char *) obstack_base (&token_stack
),
902 obstack_object_size (&token_stack
), 0, 0,
905 regs
.end
[0] != obstack_object_size (&token_stack
))
907 *(((char *) obstack_base (&token_stack
)
908 + obstack_object_size (&token_stack
)) - 1) = '\0';
914 obstack_1grow (&token_stack
, '\0');
915 orig_text
= (char *) obstack_finish (&token_stack
);
917 if (regs
.start
[1] != -1)
918 obstack_grow (&token_stack
, orig_text
+ regs
.start
[1],
919 regs
.end
[1] - regs
.start
[1]);
921 obstack_grow (&token_stack
, orig_text
, regs
.end
[0]);
926 #endif /* ENABLE_CHANGEWORD */
928 else if (!MATCH (ch
, lquote
.string
, true))
945 obstack_1grow (&token_stack
, ch
);
954 /* current_file changed to "" if we see CHAR_EOF, use
955 the previous value we stored earlier. */
956 m4_error_at_line (EXIT_FAILURE
, 0, file
, *line
, caller
,
957 _("end of file in string"));
959 if (MATCH (ch
, rquote
.string
, true))
961 if (--quote_level
== 0)
963 obstack_grow (&token_stack
, rquote
.string
, rquote
.length
);
965 else if (MATCH (ch
, lquote
.string
, true))
968 obstack_grow (&token_stack
, lquote
.string
, lquote
.length
);
971 obstack_1grow (&token_stack
, ch
);
976 obstack_1grow (&token_stack
, '\0');
978 TOKEN_DATA_TYPE (td
) = TOKEN_TEXT
;
979 TOKEN_DATA_TEXT (td
) = (char *) obstack_finish (&token_stack
);
980 #ifdef ENABLE_CHANGEWORD
981 if (orig_text
== NULL
)
982 orig_text
= TOKEN_DATA_TEXT (td
);
983 TOKEN_DATA_ORIG_TEXT (td
) = orig_text
;
986 xfprintf (stderr
, "next_token -> %s (%s)\n",
987 token_type_string (type
), TOKEN_DATA_TEXT (td
));
992 /*-----------------------------------------------.
993 | Peek at the next token from the input stream. |
994 `-----------------------------------------------*/
1000 int ch
= peek_input ();
1006 else if (ch
== CHAR_MACRO
)
1008 result
= TOKEN_MACDEF
;
1010 else if (MATCH (ch
, bcomm
.string
, false))
1012 result
= TOKEN_STRING
;
1014 else if ((default_word_regexp
&& (isalpha (ch
) || ch
== '_'))
1015 #ifdef ENABLE_CHANGEWORD
1016 || (!default_word_regexp
&& word_start
[ch
])
1017 #endif /* ENABLE_CHANGEWORD */
1020 result
= TOKEN_WORD
;
1022 else if (MATCH (ch
, lquote
.string
, false))
1024 result
= TOKEN_STRING
;
1030 result
= TOKEN_OPEN
;
1033 result
= TOKEN_COMMA
;
1036 result
= TOKEN_CLOSE
;
1039 result
= TOKEN_SIMPLE
;
1043 xfprintf (stderr
, "peek_token -> %s\n", token_type_string (result
));
1044 #endif /* DEBUG_INPUT */
1052 token_type_string (token_type t
)
1078 print_token (const char *s
, token_type t
, token_data
*td
)
1080 xfprintf (stderr
, "%s: ", s
);
1087 xfprintf (stderr
, "char:");
1091 xfprintf (stderr
, "word:");
1095 xfprintf (stderr
, "string:");
1099 xfprintf (stderr
, "macro: %p\n", TOKEN_DATA_FUNC (td
));
1103 xfprintf (stderr
, "eof\n");
1106 xfprintf (stderr
, "\t\"%s\"\n", TOKEN_DATA_TEXT (td
));
1109 static void M4_GNUC_UNUSED
1115 while ((t
= next_token (&td
, NULL
, "<debug>")) != TOKEN_EOF
)
1116 print_token ("lex", t
, &td
);