Added support for 2.6.27 kernel
[openwrt.git] / package / base-files / files / lib / config / parse_spec.awk
1 # AWK file for parsing uci specification files
2 #
3 # Copyright (C) 2006 by Fokus Fraunhofer <carsten.tittel@fokus.fraunhofer.de>
4 #
5 # This program is free software; you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation; either version 2 of the License, or
8 # (at your option) any later version.
9 #
10 # This program is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 # General Public License for more details.
14 #
15 # You should have received a copy of the GNU General Public License
16 # along with this program; if not, write to the Free Software
17 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 #
19 #
20 # general: unfortunately, the development was done using gawk providing
21 # a different match() functions than e.g. mawk on debian systems
22 # - therefore, the script was changed to run on most awk's
23 # - even things like [:space:] are not used
24 #
25 # - script parses the config section definition contained in one
26 # specification file
27 # global variables:
28 # * section - contains the current config section name
29 # * var - contains the name of the current config option
30 # * type - contains the type of the current config option
31 # * required - contains the requirements of the current config option
32 # * optional - contains the optional scope of the current config option
33 # * vars[] - array, contains the name of all config options valid within
34 # a certain config section, format: csv
35 #
36 # XXX todo: more than one config option with the same in different section
37 # will clash for the following tables
38 # * types[] - contains the type of a config option
39 # * reqs[] - contains the requirements of a config option
40 # * opts[] - contains the optional scope of a config option
41 #
42 BEGIN {
43 section_count=1
44 section = ""
45 simple_types = "int|ip|netmask|string|wep|hostname|mac|port|ports|wpapsk"
46 }
47
48 # function print_specification
49 # - prints all information about the created tables containing the
50 # specification
51 function print_specification() {
52 for (section in vars) {
53 printf("%s\n",section);
54 split(vars[section],arr,",")
55 for (idx in arr) {
56 printf("\t%s[%s]",arr[idx],types[section "_" arr[idx]]);
57 if (length(reqs[section "_" arr[idx]])) {
58 if (reqs[section "_" arr[idx]]==1) {
59 printf(",req");
60 }else{
61 printf(", req(%s)", reqs[section "_" arr[idx]]);
62 }
63 }
64 if (length(opts[section "_" arr[idx]])) {
65 printf(", opt(%s)", opts[section "_" arr[idx]]);
66 }
67 printf("\n");
68 }
69 }
70 }
71
72
73 function reset_option() {
74 # just set global variables parsed on one line back to defaults
75 var = ""
76 type = ""
77 required = ""
78 optional = ""
79 found = 0
80 }
81
82 function store_option() {
83 # save all information about a config option parsed from the spec file
84 # to the relevant tables for future use
85
86 # first check minimum requirements for storing information
87 if (!length(section)) {
88 print STDERR "line " NR ": section definition missing"
89 exit 1
90 }
91 if (!length(var)) {
92 print STDERR "line " NR ": invalid config option name"
93 exit 1
94 }
95 if (!length(type)) {
96 print STDERR "line " NR ": invalid config option type"
97 exit 1
98 }
99
100 # add config options to the names of options available for this
101 # section
102 if (exists[section]!=1) {
103 section_names[section_count] = section
104 section_count++
105 exists[section] = 1
106 vars[section] = var
107 } else {
108 vars[section] = vars[section] "," var
109 }
110
111 # save the type, the requirements and the optional scope of the
112 # config option
113 types[section "_" var] = type
114 reqs[section "_" var] = required
115 opts[section "_" var] = optional
116 }
117
118 /^declare -x|^export/ {
119 sub(/^declare -x /,"")
120 sub(/^export /,"")
121 split($0,arr,"=")
122 val=substr(arr[2],2,length(arr[2])-2)
123 ENVIRON[arr[1]] = val
124 next
125 }
126
127 # main parsing function
128 # this is done in one function block to allow multiple semicolon separated
129 # definitions on one line
130 {
131 # replace leading/trailing white space
132 gsub("^[ \t\n]+","");
133 gsub("[ \t\n]+$","");
134
135 # comments are removed
136 # XXX todo: check for quoted comments??
137 if (match($0,/[^#]*/)) {
138 rest=substr($0,RSTART,RLENGTH)
139 } else {
140 rest=$0
141 }
142
143 # match the config section "<section> {"
144 if (match(rest,/^[^ \t\n{]+[ \t\n]*\{/)) {
145 match(rest,/^[^ \t\n{]+/)
146 section = substr(rest,RSTART,RLENGTH)
147 rest=substr($0,RSTART+RLENGTH);
148 match(rest,/[ \t\n]*\{/)
149 rest=substr(rest,RSTART+RLENGTH)
150 # check for array indication
151 if (match(section,/\[[ \t\n]*\]/)) {
152 section=substr(section,1,RSTART-1)
153 multiple[section] = 1
154 } else {
155 multiple[section] = 0
156 }
157 }
158
159 reset_option()
160
161 # parse the remaing line as long as there is something to parse
162 while (rest ~ "[^ \t\n}]+") {
163 found = 0
164
165 # get option name and option type
166 # first, check for "simple" datatype definitions
167 if (match(rest,"[^: \t\n]+[ \t\n]*:[ \t\n]*(" \
168 simple_types ")")){
169 match(rest,"[^: \t\n]+")
170 var=substr(rest,RSTART,RLENGTH)
171 rest=substr(rest,RSTART+RLENGTH)
172 match(rest,"[ \t\n]*:[ \t\n]*")
173 rest=substr(rest,RSTART+RLENGTH)
174 match(rest,"(" simple_types ")")
175 type=substr(rest,RSTART,RLENGTH)
176 rest = substr(rest,RSTART+RLENGTH)
177 found = 1
178 # next, check for enum definitions
179 } else if (match(rest,/[^: \t\n]+[ \t\n]*:[ \t\n]*enum\([^\)]+\)/ )) {
180 match(rest,"[^: \t\n]+")
181 var=substr(rest,RSTART,RLENGTH)
182 rest=substr(rest,RSTART+RLENGTH)
183 match(rest,/[ \t\n]*:[ \t\n]*enum\(/)
184 rest=substr(rest,RSTART+RLENGTH)
185 match(rest,/[^\)]+/)
186 type="enum," substr(rest,RSTART,RLENGTH)
187 rest = substr(rest,RSTART+RLENGTH+1)
188 found=1
189 }
190
191 # after the name and the type,
192 # get the option requirements/scope
193 if (match(rest,/[^,]*,[ \t\n]*required\[[^]]+\]/)) {
194 match(rest,"[^,]*")
195 save=substr(rest,RSTART,RLENGTH)
196 rest=substr(rest,RSTART+RLENGTH)
197 match(rest,/,[ \t\n]*required\[/);
198 rest=substr(rest,RSTART+RLENGTH)
199 match(rest,/[^]]+\]/)
200 required=substr(rest,RSTART,RLENGTH-1)
201 save=save substr(rest,RSTART+RLENGTH)
202 rest=save
203 found=1
204 } else if (match(rest,/[^,]*,[ \t\n]*required/)) {
205 match(rest,"[^,]*")
206 save=substr(rest,RSTART,RLENGTH)
207 rest=substr(rest,RSTART+RLENGTH)
208 match(rest,",[ \t\n]*required");
209 rest=substr(rest,RSTART+RLENGTH)
210 required=1
211 save=save substr(rest,RSTART+RLENGTH)
212 rest=save
213 found=1
214 }
215 if (match(rest,/[^,]*,[ \t\n]*optional\[[^]]+\]/)) {
216 match(rest,"[^,]*")
217 save=substr(rest,RSTART,RLENGTH)
218 rest=substr(rest,RSTART+RLENGTH)
219 match(rest,/,[ \t\n]*optional\[/);
220 rest=substr(rest,RSTART+RLENGTH)
221 match(rest,/[^]]+\]/)
222 optional=substr(rest,RSTART,RLENGTH-1)
223 save=save substr(rest,RSTART+RLENGTH)
224 rest=save
225 found=1
226 }
227
228 # if the remaining line contains a semicolon, complete the
229 # specification of the config options
230 if (match(rest, "^[ \t\n]*;(.*)")) {
231 match(rest,"^[ \t\n]*;")
232 rest=substr(rest,RSTART+RLENGTH)
233 if (found==1) {
234 store_option()
235 }
236 reset_option()
237
238 # if nothing matched on this line, clear the rest
239 } else if (!found) {
240 rest = ""
241 }
242 }
243
244 # after the line is pared, store the configuration option in the
245 # table if any has been defined
246 if (length(var)) {
247 store_option()
248 reset_option()
249 }
250 # close the section if the line contained a closing section bracket,
251 # XXX todo: check if this has to be done more intelligent
252 if ($0 ~ /\}/) {
253 section=""
254 }
255 }
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