vgrindefs(5) Unsupported vgrindefs(5)Namevgrindefs - vgrind's language definition data base
Syntax
/usr/lib/vgrindefs
Description
The database contains all language definitions for vgrind. The data‐
base is very similar to
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
Entries may continue onto multiple lines by giving a \ as the last
character of a line. Capabilities in vgrindefs are of two types: Bool‐
ean capabilities which indicate that the language has some particular
feature and string capabilities which give a regular expression or key‐
word list.
Regular Expressions
The database uses regular expression which are very similar to those
of and 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 char‐
acter (\). 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".
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
lower case are equivalent, then all the keywords should be specified in
lower case.
Examples
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 as c or C.
Files
/usr/lib/vgrindefs file containing terminal descriptions
See Alsotroff(1), vgrind(1)
VAX vgrindefs(5)
