vgrindefs -- language definition data base for vgrind(1)
vgrindefs
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
comment
ae str regular expression for the end of an alternate
comment
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
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.
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":\
: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 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.
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 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".
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.
troff(1), vgrind(1)
The vgrindefs file format appeared in 4.2BSD.
FreeBSD 5.2.1 June 6, 1993 FreeBSD 5.2.1 [ Back ] | 