Standards, Environments, and Macros vgrindefs(5)
NAME
vgrindefs - vgrind's language definition data base
SYNOPSIS
/usr/lib/vgrindefs
DESCRIPTION
vgrindefs contains all language definitions for vgrind(1).
Capabilities in vgrindefs are of two types: Boolean capabil-
ities which indicate that the language has some particular
feature and string capabilities which give a regular expres-
sion or keyword list. Entries may continue onto multiple
lines by giving a \ as the last character of a line. Lines
starting with # are comments.
Capabilities
The following table names and describes each capability.
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Standards, Environments, and Macros vgrindefs(5)
Name Type Description
ab str Regular expression for the start of an
alternate form comment
ae str Regular expression for the end of an alter-
nate form comment
bb str Regular expression for the start of a block
be str Regular expression for the end of a lexical
block
cb str Regular expression for the start of a com-
ment
ce str Regular expression for the end of a comment
id str String giving characters other than letters
and digits that may legally occur in iden-
tifiers (default `')
kw str A list of keywords separated by spaces
lb str Regular expression for the start of a char-
acter constant
le str Regular expression for the end of a charac-
ter constant
oc bool Present means upper and lower case are
equivalent
pb str Regular expression for start of a procedure
pl bool Procedure definitions are constrained to
the lexical level matched by the `px' capa-
bility
px str A match for this regular expression indi-
cates that procedure definitions may occur
at the next lexical level. Useful for
lisp-like languages in which procedure
definitions occur as subexpressions of
defuns.
sb str Regular expression for the start of a
string
se str Regular expression for the end of a string
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Standards, Environments, and Macros vgrindefs(5)
tc str Use the named entry as a continuation of
this one
tl bool Present means procedures are only defined
at the top lexical level
Regular Expressions
vgrindefs uses regular expressions 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 identifier. In a procedure definition
(the `pb' capability) 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) that 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
`(trampsteamer)flies?' would match `tramp', `steamer',
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Standards, Environments, and Macros vgrindefs(5)
`trampflies', or `steamerflies'. Contrary to some forms of
regular expressions, vgrindef alternation binds very
tightly. Grouping parentheses are likely to be necessary in
expressions involving alternation.
Keyword List
The keyword list is just a list of keywords in the language
separated by spaces. If the `oc' boolean is specified, indi-
cating that upper and lower case are equivalent, then all
the keywords should be specified in lower case.
EXAMPLES
Example 1 A sample program.
The following entry, which describes the C language, is typ-
ical of a language entry.
Ccthe C programming language:\
:pb=^\d?*?\d?\p\d?(\a?\)(\d{):bb={:be=}:cb=/*:ce=*/:sb=":se=\e":\
: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 void while #define\
#else #endif #if #ifdef #ifndef #include #undef # define endif\
ifdef ifndef include undef defined:
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'.
FILES
/usr/lib/vgrindefs file containing vgrind descriptions
SEE ALSO
ex(1), lex(1), troff(1), vgrind(1)
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