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VGRINDEFS(5)									     VGRINDEFS(5)

       vgrindefs - vgrind's language definition data base


       Vgrindefs  contains all language definitions for vgrind.  The data base is very similar to

       The following table names and describes each field.

       Name   Type  Description
       pb     str   regular expression for start of a procedure
       bb     str   regular expression for start of a lexical block
       be     str   regular expression for the end of a lexical block
       cb     str   regular expression for the start of a comment
       ce     str   regular expression for the end of a comment
       sb     str   regular expression for the start of a string
       se     str   regular expression for the end of a string
       lb     str   regular expression for the start of a character constant
       le     str   regular expression for the end of a character constant
       tl     bool  present means procedures are only defined at the top
		    lexical level
       oc     bool  present means upper and lower case are equivalent
       kw     str   a list of keywords separated by spaces


       The following entry, which describes the C language, is typical of a language entry.

       C|c:   :pb=^\d?*?\d?\p\d?a?:bb={:be=}:cb=/*:ce=*/:sb=":se=\e":\
	      :kw=asm auto break case char continue default do double else enum\
	      extern float for fortran goto if int long register return short\
	      sizeof static struct switch typedef union unsigned while #define\
	      #else #endif #if #ifdef #ifndef #include #undef # define else endif\
	      if ifdef ifndef include undef:

       Note that the first field is just the language name (and any variants of it).  Thus the	C
       language could be specified to vgrind(1) as "c" or "C".

       Entries	may  continue  onto multiple lines by giving a \ as the last character of a line.
       Capabilities in vgrindefs are of two types: Boolean capabilities which indicate	that  the
       language  has some particular feature and string capabilities which give a regular expres-
       sion or keyword list.


       Vgrindefs uses regular expression which are very similar to those  of  ex(1)  and  lex(1).
       The  characters	`^', `$', `:' and `\' are reserved characters and must be "quoted" with a
       preceding \ if they are to be included as normal characters.  The  metasymbols  and  their
       meanings are:

       $      the end of a line

       ^      the beginning of a line

       \d     a delimiter (space, tab, newline, start of line)

       \a     matches any string of symbols (like .* in lex)

       \p     matches  any  alphanumeric  name.   In  a procedure definition (pb) the string that
	      matches this symbol is used as the procedure name.

       ()     grouping

       |      alternation

       ?      last item is optional

       \e     preceding any string means that the string will not match an input  string  if  the
	      input  string  is  preceded by an escape character (\).  This is typically used for
	      languages (like C) which can include the string delimiter in a  string  b  escaping

       Unlike  other  regular  expressions  in the system,  these match words and not characters.
       Hence  something   like	 "(tramp|steamer)flies?"    would   match   "tramp",   "steamer",
       "trampflies", or "steamerflies".


       The  keyword  list is just a list of keywords in the language separated by spaces.  If the
       "oc" boolean is specified, indicating that upper and lower case are equivalent,	then  all
       the keywords should be specified in lower case.

       /usr/share/misc/vgrindefs     file containing terminal descriptions

       vgrind(1), troff(1)

       Dave Presotto

4.2 Berkeley Distribution		 October 22, 1996			     VGRINDEFS(5)
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