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28 .\" @(#)vgrindefs.5 8.1 (Berkeley) 6/6/93
29 .\" $FreeBSD: src/usr.bin/vgrind/vgrindefs.5,v 1.5.2.4 2001/08/16 13:17:13 ru Exp $
36 .Nd language definition data base for
44 contains all language definitions for
50 The following table names and describes each field.
51 .Bl -column Namexxx Tpexxx
52 .It Sy "Name Type Description"
53 .It "ab str regular expression for the start of an alternate comment"
54 .It "ae str regular expression for the end of an alternate comment"
55 .It "pb str regular expression for start of a procedure"
56 .It "bb str regular expression for start of a lexical block"
57 .It "be str regular expression for the end of a lexical block"
58 .It "cb str regular expression for the start of a comment"
59 .It "ce str regular expression for the end of a comment"
60 .It "sb str regular expression for the start of a string"
61 .It "se str regular expression for the end of a string"
62 .It "lb str regular expression for the start of a character constant"
63 .It "le str regular expression for the end of a character constant"
64 .It "nc str regular expression for a non-comment (see below)"
65 .It "tl bool present means procedures are only defined at the top lexical level"
66 .It "oc bool present means upper and lower case are equivalent"
67 .It "kw str a list of keywords separated by spaces"
70 Non-comments are required to describe a certain context where a
71 sequence that would normally start a comment loses its special
72 meaning. A typical example for this can be found in Perl, where
73 comments are normally starting with
77 is an operator on an array.
78 .Sh REGULAR EXPRESSIONS
80 uses regular expression which are very similar to those of
84 The characters `^', `$', `:' and `\e'
85 are reserved characters and must be
86 "quoted" with a preceding
89 are to be included as normal characters.
90 The metasymbols and their meanings are:
91 .Bl -tag -width indent
95 the beginning of a line
97 a delimiter (space, tab, newline, start of line)
99 matches any string of symbols (like .* in lex)
101 matches any alphanumeric name. In a procedure definition (pb) the string
102 that matches this symbol is used as the procedure name.
108 last item is optional
110 preceding any string means that the string will not match an
111 input string if the input string is preceded by an escape character (\e).
112 This is typically used for languages (like C) which can include the
113 string delimiter in a string by escaping it.
116 Unlike other regular expressions in the system, these match words
117 and not characters. Hence something like "(tramp|steamer)flies?"
118 would match "tramp", "steamer", "trampflies", or "steamerflies".
120 The keyword list is just a list of keywords in the language separated
121 by spaces. If the "oc" boolean is specified, indicating that upper
122 and lower case are equivalent, then all the keywords should be
123 specified in lower case.
125 .Bl -tag -width /usr/share/misc/vgrindefs -compact
126 .It Pa /usr/share/misc/vgrindefs
127 File containing terminal descriptions.
130 The following entry, which describes the C language, is
131 typical of a language entry.
134 :pb=^\ed?*?\ed?\ep\ed?\e(\ea?\e):bb={:be=}:cb=/*:ce=*/:sb=":se=\ee":\e
136 :kw=asm auto break case char continue default do double else enum\e
137 extern float for fortran goto if int long register return short\e
138 sizeof static struct switch typedef union unsigned while #define\e
139 #else #endif #if #ifdef #ifndef #include #undef # define else endif\e
140 if ifdef ifndef include undef:
143 Note that the first field is just the language name (and any variants
144 of it). Thus the C language could be specified to
148 Entries may continue onto multiple lines by giving a \e as the last
153 Boolean capabilities which indicate that the language has
154 some particular feature
156 capabilities which give a regular expression or
164 file format appeared in