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VGRINDEFS(5)              NetBSD Programmer's Manual              VGRINDEFS(5)


NAME

     vgrindefs - language definition data base for vgrind(1)


SYNOPSIS

     vgrindefs


DESCRIPTION

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


FIELDS

     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


EXAMPLES

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

     C|c::pb=^\d?*?\d?\p\d?\(\a?\):bb={:be=}:cb=/*:ce=*/:sb=":se=\e":\
     :lb=':le=\e':tl:\
     :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 char-
     acter of a line.  Capabilities in vgrindefs are of two types: Boolean ca-
     pabilities which indicate that the language has some particular feature
     and string capabilities which give a regular expression or keyword list.


REGULAR EXPRESSIONS

     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 in-
             put string if the input string is preceded by an escape character
             (\).  This is typically used for languages (like C) which can in-
             clude the string delimiter in a string by escaping it.

     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".


KEYWORD LIST

     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 low-
     er case are equivalent, then all the keywords should be specified in low-
     er case.


FILES

     /usr/share/misc/vgrindefs  File containing terminal descriptions.


SEE ALSO

     vgrind(1),  troff(1)


HISTORY

     The vgrindefs file format appeared in 4.2BSD.

4.2 Berkeley Distribution        June 6, 1993                                2