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1.1 root 1: .TH RCSFILE 5 6/29/83 "Purdue University"
2: .SH NAME
3: rcsfile \- format of RCS file
4: .SH DESCRIPTION
5: An RCS file is an ASCII file. Its contents is described by the grammar
6: below. The text is free format, i.e., spaces, tabs and new lines have
7: no significance except in strings. Strings are enclosed by `@'.
8: If a string contains a `@', it must be doubled.
9: .PP
10: The meta syntax uses the following conventions: `|' (bar) separates
11: alternatives; `{' and `}' enclose optinal phrases; `{' and `}*' enclose
12: phrases that may be repeated zero or more times;
13: `{' and '}+' enclose phrases that must appear at least once and may be
14: repeated;
15: `<' and `>' enclose nonterminals.
16: .PP
17: .ta 1.5i 2.0i 3i
18: .fc ~
19: .nf
20:
21:
22: <rcstext> ~~::=~~<admin> {<delta>}* <desc> {<deltatext>}*
23:
24: <admin> ~~::=~~\fBhead\fR ~~{<num>};
25: ~~ ~~\fBaccess\fR ~~{<id>}*;
26: ~~ ~~\fBsymbols\fR ~~{<id> : <num>}*;
27: ~~ ~~\fBlocks\fR ~~{<id> : <num>}*;
28: ~~ ~~\fBcomment\fR ~~{<string>};
29:
30: <delta> ~~::=~~<num>
31: ~~ ~~\fBdate\fR ~~<num>;
32: ~~ ~~\fBauthor\fR ~~<id>;
33: ~~ ~~\fBstate\fR ~~{<id>};
34: ~~ ~~\fBbranches\fR ~~{<num>}*;
35: ~~ ~~\fBnext\fR ~~{<num>};
36:
37: <desc> ~~::=~~\fBdesc\fR ~~<string>
38:
39: <deltatext>~~::=~~<num>
40: ~~ ~~\fBlog\fR ~~<string>
41: ~~ ~~\fBtext\fR ~~<string>
42:
43:
44: <num> ~~::=~~{<digit>{.}}+
45:
46: <digit> ~~::=~~0 | 1 | ... | 9
47:
48: <id> ~~::=~~<letter>{<idchar>}*
49:
50: <letter> ~~::=~~A | B | ... | Z | a | b | ... | z
51:
52: <idchar> ~~::=~~Any printing ASCII character except space,
53: ~~ ~~tab, carriage return, new line, and <special>.
54:
55: <special> ~~::=~~; | : | , | @
56:
57: <string> ~~::=~~@{any ASCII character, with `@' doubled}*@
58:
59: .fi
60: .PP
61: Identifiers are case sensitive. Keywords are in lower case only.
62: The sets of keywords and identifiers may overlap.
63: .PP
64: The <delta> nodes form a tree. All nodes whose numbers
65: consist of a single pair
66: (e.g., 2.3, 2.1, 1.3, etc.)
67: are on the "trunk", and are linked through the "next"
68: field in order of decreasing numbers. The "head" field in the
69: <admin> node points to the head of that sequence (i.e., contains
70: the highest pair).
71: .PP
72: All <delta> nodes whose numbers consist of 2n fields (n\(>=2)
73: (e.g., 3.1.1.1, 2.1.2.2, etc.)
74: are linked as follows. All nodes whose first (2n)-1 number fields are identical
75: are linked through the "next" field in order of increasing numbers.
76: For each such sequence,
77: the <delta> node whose number is identical to the first
78: 2(n-1) number fields of the deltas on that sequence is called the branchpoint.
79: The "branches" field of a node contains a list of the
80: numbers of the first nodes of all sequences for which it is a branchpoint.
81: This list is ordered in increasing numbers.
82: .PP
83: Example:
84: .nf
85: .vs 12pts
86: .cs 1 20
87: Head
88: |
89: |
90: v
91: ---------
92: / \\ / \\ | | / \\ / \\
93: / \\ / \\ | 2.1 | / \\ / \\
94: / \\ / \\ | | / \\ / \\
95: /1.2.1.3\\ /1.3.1.1\\ | | /1.2.2.2\\ /1.2.2.1.1.1\\
96: --------- --------- --------- --------- -------------
97: ^ ^ | ^ ^
98: | | | | |
99: | | v | |
100: / \\ | --------- / \\ |
101: / \\ | \\ 1.3 / / \\ |
102: / \\ ---------\\ / / \\-----------
103: /1.2.1.1\\ \\ / /1.2.2.1\\
104: --------- \\ / ---------
105: ^ | ^
106: | | |
107: | v |
108: | --------- |
109: | \\ 1.2 / |
110: ----------------------\\ /---------
111: \\ /
112: \\ /
113: |
114: |
115: v
116: ---------
117: \\ 1.1 /
118: \\ /
119: \\ /
120: \\ /
121:
122:
123: .cs 1
124: .ce
125: Fig. 1: A revision tree
126: .fi
127: .PP
128: .SH IDENTIFICATION
129: .de VL
130: \\$2
131: ..
132: Author: Walter F. Tichy,
133: Purdue University, West Lafayette, IN, 47907.
134: .sp 0
135: Revision Number:
136: .VL $Revision: 3.0 $
137: ; Release Date:
138: .VL $Date: 82/11/18 16:36:39 $
139: \&.
140: .sp 0
141: Copyright \(co 1982 by Walter F. Tichy.
142: .SH SEE ALSO
143: ci (1), co (1), ident (1), rcs (1), rcsdiff (1), rcsintro (1), rcsmerge (1), rlog (1), sccstorcs (8).
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