vgrindefs - language definition database for vgrind(1)
vgrindefs
The vgrindefs file contains all the language definitions for
vgrind(1).
The database is very similar to termcap(5).
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=^?*????:bb={:be=}:cb=/*:ce=*/:sb=":se=\":
:lb=':le=\':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 expressions 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:
$ End of a line.
^ Beginning of a line.
A delimiter (space, tab, newline, start of line).
Matches any string of symbols (like .* in lex).
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.
\ 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.
OpenBSD 3.6 June 6, 1993
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