2002-05-09 Elena Zannoni <ezannoni@redhat.com>

[deliverable/binutils-gdb.git] / binutils / rclex.l

%{ /* rclex.l -- lexer for Windows rc files parser  */
/* Copyright 1997, 1998, 1999, 2001, 2002 Free Software Foundation, Inc.
   Written by Ian Lance Taylor, Cygnus Support.

   This file is part of GNU Binutils.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
   02111-1307, USA.  */

/* This is a lex input file which generates a lexer used by the
   Windows rc file parser.  It basically just recognized a bunch of
   keywords.  */

#include "bfd.h"
#include "bucomm.h"
#include "libiberty.h"
#include "safe-ctype.h"
#include "windres.h"
#include "rcparse.h"

#include <assert.h>

/* Whether we are in rcdata mode, in which we returns the lengths of
   strings.  */

static int rcdata_mode;

/* Whether we are supressing lines from cpp (including windows.h or
   headers from your C sources may bring in externs and typedefs).
   When active, we return IGNORED_TOKEN, which lets us ignore these
   outside of resource constructs.  Thus, it isn't required to protect
   all the non-preprocessor lines in your header files with #ifdef
   RC_INVOKED.  It also means your RC file can't include other RC
   files if they're named "*.h".  Sorry.  Name them *.rch or whatever.  */

static int suppress_cpp_data;

#define MAYBE_RETURN(x) return suppress_cpp_data ? IGNORED_TOKEN : (x)

/* The first filename we detect in the cpp output.  We use this to
   tell included files from the original file.  */

static char *initial_fn;

/* List of allocated strings.  */

struct alloc_string
{
  struct alloc_string *next;
  char *s;
};

static struct alloc_string *strings;

/* Local functions.  */

static void cpp_line PARAMS ((const char *));
static char *handle_quotes PARAMS ((const char *, unsigned long *));
static char *get_string PARAMS ((int));

%}

%%

"BEGIN"			{ MAYBE_RETURN (BEG); }
"{"			{ MAYBE_RETURN (BEG); }
"END"			{ MAYBE_RETURN (END); }
"}"			{ MAYBE_RETURN (END); }
"ACCELERATORS"		{ MAYBE_RETURN (ACCELERATORS); }
"VIRTKEY"		{ MAYBE_RETURN (VIRTKEY); }
"ASCII"			{ MAYBE_RETURN (ASCII); }
"NOINVERT"		{ MAYBE_RETURN (NOINVERT); }
"SHIFT"			{ MAYBE_RETURN (SHIFT); }
"CONTROL"		{ MAYBE_RETURN (CONTROL); }
"ALT"			{ MAYBE_RETURN (ALT); }
"BITMAP"		{ MAYBE_RETURN (BITMAP); }
"CURSOR"		{ MAYBE_RETURN (CURSOR); }
"DIALOG"		{ MAYBE_RETURN (DIALOG); }
"DIALOGEX"		{ MAYBE_RETURN (DIALOGEX); }
"EXSTYLE"		{ MAYBE_RETURN (EXSTYLE); }
"CAPTION"		{ MAYBE_RETURN (CAPTION); }
"CLASS"			{ MAYBE_RETURN (CLASS); }
"STYLE"			{ MAYBE_RETURN (STYLE); }
"AUTO3STATE"		{ MAYBE_RETURN (AUTO3STATE); }
"AUTOCHECKBOX"		{ MAYBE_RETURN (AUTOCHECKBOX); }
"AUTORADIOBUTTON"	{ MAYBE_RETURN (AUTORADIOBUTTON); }
"CHECKBOX"		{ MAYBE_RETURN (CHECKBOX); }
"COMBOBOX"		{ MAYBE_RETURN (COMBOBOX); }
"CTEXT"			{ MAYBE_RETURN (CTEXT); }
"DEFPUSHBUTTON"		{ MAYBE_RETURN (DEFPUSHBUTTON); }
"EDITTEXT"		{ MAYBE_RETURN (EDITTEXT); }
"GROUPBOX"		{ MAYBE_RETURN (GROUPBOX); }
"LISTBOX"		{ MAYBE_RETURN (LISTBOX); }
"LTEXT"			{ MAYBE_RETURN (LTEXT); }
"PUSHBOX"		{ MAYBE_RETURN (PUSHBOX); }
"PUSHBUTTON"		{ MAYBE_RETURN (PUSHBUTTON); }
"RADIOBUTTON"		{ MAYBE_RETURN (RADIOBUTTON); }
"RTEXT"			{ MAYBE_RETURN (RTEXT); }
"SCROLLBAR"		{ MAYBE_RETURN (SCROLLBAR); }
"STATE3"		{ MAYBE_RETURN (STATE3); }
"USERBUTTON"		{ MAYBE_RETURN (USERBUTTON); }
"BEDIT"			{ MAYBE_RETURN (BEDIT); }
"HEDIT"			{ MAYBE_RETURN (HEDIT); }
"IEDIT"			{ MAYBE_RETURN (IEDIT); }
"FONT"			{ MAYBE_RETURN (FONT); }
"ICON"			{ MAYBE_RETURN (ICON); }
"LANGUAGE"		{ MAYBE_RETURN (LANGUAGE); }
"CHARACTERISTICS"	{ MAYBE_RETURN (CHARACTERISTICS); }
"VERSION"		{ MAYBE_RETURN (VERSIONK); }
"MENU"			{ MAYBE_RETURN (MENU); }
"MENUEX"		{ MAYBE_RETURN (MENUEX); }
"MENUITEM"		{ MAYBE_RETURN (MENUITEM); }
"SEPARATOR"		{ MAYBE_RETURN (SEPARATOR); }
"POPUP"			{ MAYBE_RETURN (POPUP); }
"CHECKED"		{ MAYBE_RETURN (CHECKED); }
"GRAYED"		{ MAYBE_RETURN (GRAYED); }
"HELP"			{ MAYBE_RETURN (HELP); }
"INACTIVE"		{ MAYBE_RETURN (INACTIVE); }
"MENUBARBREAK"		{ MAYBE_RETURN (MENUBARBREAK); }
"MENUBREAK"		{ MAYBE_RETURN (MENUBREAK); }
"MESSAGETABLE"		{ MAYBE_RETURN (MESSAGETABLE); }
"RCDATA"		{ MAYBE_RETURN (RCDATA); }
"STRINGTABLE"		{ MAYBE_RETURN (STRINGTABLE); }
"VERSIONINFO"		{ MAYBE_RETURN (VERSIONINFO); }
"FILEVERSION"		{ MAYBE_RETURN (FILEVERSION); }
"PRODUCTVERSION"	{ MAYBE_RETURN (PRODUCTVERSION); }
"FILEFLAGSMASK"		{ MAYBE_RETURN (FILEFLAGSMASK); }
"FILEFLAGS"		{ MAYBE_RETURN (FILEFLAGS); }
"FILEOS"		{ MAYBE_RETURN (FILEOS); }
"FILETYPE"		{ MAYBE_RETURN (FILETYPE); }
"FILESUBTYPE"		{ MAYBE_RETURN (FILESUBTYPE); }
"VALUE"			{ MAYBE_RETURN (VALUE); }
"MOVEABLE"		{ MAYBE_RETURN (MOVEABLE); }
"FIXED"			{ MAYBE_RETURN (FIXED); }
"PURE"			{ MAYBE_RETURN (PURE); }
"IMPURE"		{ MAYBE_RETURN (IMPURE); }
"PRELOAD"		{ MAYBE_RETURN (PRELOAD); }
"LOADONCALL"		{ MAYBE_RETURN (LOADONCALL); }
"DISCARDABLE"		{ MAYBE_RETURN (DISCARDABLE); }
"NOT"			{ MAYBE_RETURN (NOT); }

"BLOCK"[ \t\n]*"\""[^\#\n]*"\"" {
			  char *s, *send;

			  /* This is a hack to let us parse version
                             information easily.  */

			  s = strchr (yytext, '"');
			  ++s;
			  send = strchr (s, '"');
			  if (strncmp (s, "StringFileInfo",
				       sizeof "StringFileInfo" - 1) == 0
			      && s + sizeof "StringFileInfo" - 1 == send)
			    MAYBE_RETURN (BLOCKSTRINGFILEINFO);
			  else if (strncmp (s, "VarFileInfo",
					    sizeof "VarFileInfo" - 1) == 0
				   && s + sizeof "VarFileInfo" - 1 == send)
			    MAYBE_RETURN (BLOCKVARFILEINFO);
			  else
			    {
			      char *r;

			      r = get_string (send - s + 1);
			      strncpy (r, s, send - s);
			      r[send - s] = '\0';
			      yylval.s = r;
			      MAYBE_RETURN (BLOCK);
			    }
			}

"#"[^\n]*		{
			  cpp_line (yytext);
			}

[0-9][x0-9A-Fa-f]*L	{
			  yylval.i.val = strtoul (yytext, 0, 0);
			  yylval.i.dword = 1;
			  MAYBE_RETURN (NUMBER);
			}

[0-9][x0-9A-Fa-f]*	{
			  yylval.i.val = strtoul (yytext, 0, 0);
			  yylval.i.dword = 0;
			  MAYBE_RETURN (NUMBER);
			}

("\""[^\"\n]*"\""[ \t]*)+ {
			  char *s;
			  unsigned long length;

			  s = handle_quotes (yytext, &length);
			  if (! rcdata_mode)
			    {
			      yylval.s = s;
			      MAYBE_RETURN (QUOTEDSTRING);
			    }
			  else
			    {
			      yylval.ss.length = length;
			      yylval.ss.s = s;
			      MAYBE_RETURN (SIZEDSTRING);
			    }
			}

[A-Za-z][^ ,\t\r\n]*	{
			  char *s;

			  /* I rejected comma in a string in order to
			     handle VIRTKEY, CONTROL in an accelerator
			     resource.  This means that an unquoted
			     file name can not contain a comma.  I
			     don't know what rc permits.  */

			  s = get_string (strlen (yytext) + 1);
			  strcpy (s, yytext);
			  yylval.s = s;
			  MAYBE_RETURN (STRING);
			}

[\n]			{ ++rc_lineno; }
[ \t\r]+		{ /* ignore whitespace */ }
.			{ MAYBE_RETURN (*yytext); }

%%
#ifndef yywrap
/* This is needed for some versions of lex.  */
int yywrap ()
{
  return 1;
}
#endif

/* Handle a C preprocessor line.  */

static void
cpp_line (s)
     const char *s;
{
  int line;
  char *send, *fn;

  ++s;
  while (ISSPACE (*s))
    ++s;
  
  line = strtol (s, &send, 0);
  if (*send != '\0' && ! ISSPACE (*send))
    return;

  /* Subtract 1 because we are about to count the newline.  */
  rc_lineno = line - 1;

  s = send;
  while (ISSPACE (*s))
    ++s;

  if (*s != '"')
    return;

  ++s;
  send = strchr (s, '"');
  if (send == NULL)
    return;

  fn = (char *) xmalloc (send - s + 1);
  strncpy (fn, s, send - s);
  fn[send - s] = '\0';

  free (rc_filename);
  rc_filename = fn;

  if (!initial_fn)
    {
      initial_fn = xmalloc (strlen (fn) + 1);
      strcpy (initial_fn, fn);
    }

  /* Allow the initial file, regardless of name.  Suppress all other
     files if they end in ".h" (this allows included "*.rc").  */
  if (strcmp (initial_fn, fn) == 0
      || strcmp (fn + strlen (fn) - 2, ".h") != 0)
    suppress_cpp_data = 0;
  else
    suppress_cpp_data = 1;
}

/* Handle a quoted string.  The quotes are stripped.  A pair of quotes
   in a string are turned into a single quote.  Adjacent strings are
   merged separated by whitespace are merged, as in C.  */

static char *
handle_quotes (input, len)
     const char *input;
     unsigned long *len;
{
  char *ret, *s;
  const char *t;
  int ch;

  ret = get_string (strlen (input) + 1);

  s = ret;
  t = input;
  if (*t == '"')
    ++t;
  while (*t != '\0')
    {
      if (*t == '\\')
	{
	  ++t;
	  switch (*t)
	    {
	    case '\0':
	      rcparse_warning ("backslash at end of string");
	      break;

	    case '\"':
	      rcparse_warning ("use \"\" to put \" in a string");
	      break;

	    case 'a':
	      *s++ = ESCAPE_B; /* Strange, but true...  */
	      ++t;
	      break;

	    case 'b':
	      *s++ = ESCAPE_B;
	      ++t;
	      break;

	    case 'f':
	      *s++ = ESCAPE_F;
	      ++t;
	      break;

	    case 'n':
	      *s++ = ESCAPE_N;
	      ++t;
	      break;

	    case 'r':
	      *s++ = ESCAPE_R;
	      ++t;
	      break;

	    case 't':
	      *s++ = ESCAPE_T;
	      ++t;
	      break;

	    case 'v':
	      *s++ = ESCAPE_V;
	      ++t;
	      break;

	    case '\\':
	      *s++ = *t++;
	      break;

	    case '0': case '1': case '2': case '3':
	    case '4': case '5': case '6': case '7':
	      ch = *t - '0';
	      ++t;
	      if (*t >= '0' && *t <= '7')
		{
		  ch = (ch << 3) | (*t - '0');
		  ++t;
		  if (*t >= '0' && *t <= '7')
		    {
		      ch = (ch << 3) | (*t - '0');
		      ++t;
		    }
		}
	      *s++ = ch;
	      break;

	    case 'x':
	      ++t;
	      ch = 0;
	      while (1)
		{
		  if (*t >= '0' && *t <= '9')
		    ch = (ch << 4) | (*t - '0');
		  else if (*t >= 'a' && *t <= 'f')
		    ch = (ch << 4) | (*t - 'a' + 10);
		  else if (*t >= 'A' && *t <= 'F')
		    ch = (ch << 4) | (*t - 'A' + 10);
		  else
		    break;
		  ++t;
		}
	      *s++ = ch;
	      break;

	    default:
	      rcparse_warning ("unrecognized escape sequence");
	      *s++ = '\\';
	      *s++ = *t++;
	      break;
	    }
	}
      else if (*t != '"')
	*s++ = *t++;
      else if (t[1] == '\0')
	break;
      else if (t[1] == '"')
	{
	  *s++ = '"';
	  t += 2;
	}
      else
	{
	  ++t;
	  assert (ISSPACE (*t));
	  while (ISSPACE (*t))
	    ++t;
	  if (*t == '\0')
	    break;
	  assert (*t == '"');
	  ++t;
	}
    }

  *s = '\0';

  *len = s - ret;

  return ret;
}

/* Allocate a string of a given length.  */

static char *
get_string (len)
     int len;
{
  struct alloc_string *as;

  as = (struct alloc_string *) xmalloc (sizeof *as);
  as->s = xmalloc (len);

  as->next = strings;
  strings = as;

  return as->s;
}

/* Discard all the strings we have allocated.  The parser calls this
   when it no longer needs them.  */

void
rcparse_discard_strings ()
{
  struct alloc_string *as;

  as = strings;
  while (as != NULL)
    {
      struct alloc_string *n;

      free (as->s);
      n = as->next;
      free (as);
      as = n;
    }

  strings = NULL;
}

/* Enter rcdata mode.  */

void
rcparse_rcdata ()
{
  rcdata_mode = 1;
}

/* Go back to normal mode from rcdata mode.  */

void
rcparse_normal ()
{
  rcdata_mode = 0;
}