1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
-- Copyright (c) 2018-2021, OARC, Inc.
-- All rights reserved.
--
-- This file is part of dnsjit.
--
-- dnsjit is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- dnsjit is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with dnsjit. If not, see <http://www.gnu.org/licenses/>.
-- dnsjit.lib.parseconf
-- Parse simple config files
-- local conf = require("dnsjit.lib.parseconf").new()
-- .
-- conf:func("config_name", function(k,...)
-- print(k,...)
-- end)
-- .
-- conf:file(file)
-- .
-- print(conf:val("another_config_name"))
--
-- This module parses simple config files that are based on the config
-- syntax of DSC, drool and parseconf helper library.
-- Each config begins with a
-- .B name
-- followed by
-- .B options
-- and ends with a
-- .BR ; .
-- Multiple configs can be given on the same line.
-- Valid option types are
-- .IR number ,
-- .IR float ,
-- .IR string ,
-- .IR "quoted string" .
-- Comments can be added by prefixing the comment with
-- .BR # .
-- .SS Example
-- # Comment
-- number 12345;
-- float 123.456;
-- string string string;
-- quoted_string "string string string";
-- multi config; on one line;
module(...,package.seeall)
local log = require("dnsjit.core.log")
local module_log = log.new("lib.parseconf")
Parseconf = {}
-- Create a new Parseconf object.
function Parseconf.new()
local self = setmetatable({
conf = {},
cf = {},
_log = log.new("lib.parseconf", module_log),
}, { __index = Parseconf })
self._log:debug("new()")
return self
end
-- Return the Log object to control logging of this instance or module.
function Parseconf:log()
if self == nil then
return module_log
end
return self._log
end
-- Set a function to call when config
-- .I name
-- is found.
function Parseconf:func(name, func)
self.cf[name] = func
end
function Parseconf:part(l, n)
local p
p = l:match("^(%d+)[%s;]", n)
if p then
return p, tonumber(p)
end
p = l:match("^(%d+%.%d+)[%s;]", n)
if p then
return p, tonumber(p)
end
p = l:match("^(\"[^\"]+\")[%s;]", n)
if p then
return p, p:sub(2, -2)
end
p = l:match("^([^%s;]+)[%s;]", n)
if p then
return p, p
end
end
function Parseconf:next(l, n)
local eol = l:match("^%s*;%s*", n)
if eol then
return true, eol
end
local ws = l:match("^%s+", n)
if ws then
return ws
end
return false
end
-- Parse the given file.
function Parseconf:file(fn)
local ln, l
ln = 1
for l in io.lines(fn) do
local c = l:find("#")
if c then
l = l:sub(1, c - 1)
end
local e, m = pcall(self.line, self, l)
if e == false then
error("parse error in "..fn.."["..ln.."]: "..m)
end
ln = ln + 1
end
end
-- Parse the given line.
function Parseconf:line(l)
local n
n = 1
while n <= l:len() do
local c = nil
local va = {}
while true do
local p, v = self:part(l, n)
if not p then
error("invalid config at character "..n..": "..l:sub(n))
end
if not c then
c = p
else
table.insert(va, v)
end
n = n + p:len()
local ws, eol = self:next(l, n)
if ws == true then
if eol then
n = n + eol:len()
end
break
elseif ws == false then
error("invalid config at character "..n..": "..l:sub(n))
end
n = n + ws:len()
end
if self.cf[c] then
self.cf[c](c, unpack(va))
else
self.conf[c] = va
end
end
end
-- Get the value of a config
-- .IR name .
function Parseconf:val(name)
return self.conf[name]
end
return Parseconf
|
