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VGRINDEFS(5)              FreeBSD File Formats Manual             VGRINDEFS(5)

     vgrindefs - language definition data base for vgrind(1)


     The vgrindefs file contains all language definitions for vgrind(1).  The
     data base is very similar to termcap(5).

     The following table names and describes each field.

     Name       Type      Description
     ab         str       regular expression for the start of an alternate
     ae         str       regular expression for the end of an alternate
     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
     le         str       regular expression for the end of a character
     nc         str       regular expression for a non-comment (see below)
     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

     Non-comments are required to describe a certain context where a sequence
     that would normally start a comment loses its special meaning.  A typical
     example for this can be found in Perl, where comments are normally
     starting with `#', while the string `$#' is an operator on an array.

     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

     ()      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 by 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.

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

     :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 expression or keyword list.

     troff(1), vgrind(1)

     The vgrindefs file format appeared in 4.2BSD.

FreeBSD 11.1-RELEASE-p4          June 6, 1993          FreeBSD 11.1-RELEASE-p4
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