The
file
contains all language definitions for
The data base is
very similar to
FIELDS
The following table names and describes each field.
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".
Entries may continue onto multiple lines by giving a \ as the last
character of a line.
Capabilities in
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.
REGULAR EXPRESSIONS
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
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".
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.
