1 /*
2 *
3 ***** BEGIN LICENSE BLOCK *****
4
5 Copyright (C) 2009-2019 Olof Hagsand
6 Copyright (C) 2020 Olof Hagsand and Rubicon Communications, LLC(Netgate)
7
8 This file is part of CLIXON.
9
10 Licensed under the Apache License, Version 2.0 (the "License");
11 you may not use this file except in compliance with the License.
12 You may obtain a copy of the License at
13
14 http://www.apache.org/licenses/LICENSE-2.0
15
16 Unless required by applicable law or agreed to in writing, software
17 distributed under the License is distributed on an "AS IS" BASIS,
18 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
19 See the License for the specific language governing permissions and
20 limitations under the License.
21
22 Alternatively, the contents of this file may be used under the terms of
23 the GNU General Public License Version 3 or later (the "GPL"),
24 in which case the provisions of the GPL are applicable instead
25 of those above. If you wish to allow use of your version of this file only
26 under the terms of the GPL, and not to allow others to
27 use your version of this file under the terms of Apache License version 2,
28 indicate your decision by deleting the provisions above and replace them with
29 the notice and other provisions required by the GPL. If you do not delete
30 the provisions above, a recipient may use your version of this file under
31 the terms of any one of the Apache License version 2 or the GPL.
32
33 ***** END LICENSE BLOCK *****
34 *
35 * "api-path" is "URI-encoded path expression" definition in RFC8040 3.53.
36 * BNF:
37 * <api-path> := <root> ("/" (<api-identifier> | <list-instance>))*
38 * <root> := <string>
39 * <api-identifier> := [<module-name> ":"] <identifier>
40 * <module-name> := <identifier>
41 * <list-instance> := <api-identifier> "=" key-value *("," key-value)
42 * <key-value> := <string>
43 * <string> := <an unquoted string>
44 * <identifier> := (<ALPHA> | "_") (<ALPHA> | <DIGIT> | "_" | "-" | ".")
45 * @note 1. <root> is the RESTCONF root resource (Sec 3.3) omitted in all calls below, it is
46 * assumed to be stripped from api-path before calling these functions.
47 * @note 2. characters in a key value string are constrained, and some characters need to be
48 * percent-encoded,
49 * XXX For some reason, I cant use "return *string" in these rules, so I resort to symbols
50 * (eg slash)
51 */
52
53 %{
54
55 #include "clixon_config.h"
56
57 #include <stdio.h>
58 #include <string.h>
59 #include <stdint.h>
60 #include <errno.h>
61
62 #include "clixon_api_path_parse.tab.h" /* generated */
63
64 #include <cligen/cligen.h>
65
66 #include "clixon_queue.h"
67 #include "clixon_hash.h"
68 #include "clixon_handle.h"
69 #include "clixon_yang.h"
70 #include "clixon_log.h"
71 #include "clixon_string.h"
72 #include "clixon_xml.h"
73 #include "clixon_path.h"
74 #include "clixon_api_path_parse.h"
75
76 /* Redefine main lex function so that you can send arguments to it: _yy is added to arg list */
77 #define YY_DECL int clixon_api_path_parselex(void *_ay)
78
79 /* Dont use input function (use user-buffer) */
80 #define YY_NO_INPUT
81
82 /* typecast macro */
83 #define _AY ((clixon_api_path_yacc *)_ay)
84
85 #define MAXBUF 4*4*64*1024
86
87 #undef clixon_api_path_parsewrap
88 int
clixon_api_path_parsewrap(void)89 clixon_api_path_parsewrap(void)
90 {
91 return 1;
92 }
93
94 %}
95
96 namestart [A-Z_a-z]
97 namechar [A-Z_a-z\-\.0-9]
98 identifier {namestart}{namechar}*
99
100 %x INIT
101 %s KEYV
102
103 %%
104
105 <INIT,KEYV>[ \t]
106 <INIT,KEYV>\n { _AY->ay_linenum++; }
107 <INIT,KEYV>\r
108 <INIT,KEYV><<EOF>> { return X_EOF; }
109
110 <INIT>\/ { return SLASH;}
111 <INIT>\= { BEGIN(KEYV); return EQUAL; }
112 <INIT>\: { return COLON; }
113 <INIT>{identifier} { clixon_api_path_parselval.string = strdup(yytext);
114 return IDENTIFIER; }
115 <INIT>. { clixon_api_path_parseerror(_AY, "LEXICAL ERROR\n"); return -1; }
116
117 <KEYV>\, { return COMMA; }
118 <KEYV>\/ { BEGIN(INIT); return SLASH; }
119 <KEYV>[^:/?#\[\]@,]+ { clixon_api_path_parselval.string = strdup(yytext);
120 return STRING;}
121 <KEYV>. { clixon_api_path_parseerror(_AY, "LEXICAL ERROR\n"); return -1; }
122
123 %%
124
125 /*! Initialize scanner.
126 */
127 int
128 api_path_scan_init(clixon_api_path_yacc *ay)
129 {
130 BEGIN(INIT);
131 ay->ay_lexbuf = yy_scan_string(ay->ay_parse_string);
132 #if 1 /* XXX: just to use unput to avoid warning */
133 if (0)
134 yyunput(0, "");
135 #endif
136
137 return 0;
138 }
139
140 /*
141 * free buffers
142 * Even within Flex version 2.5 (this is assumed), freeing buffers is different.
143 */
144 int
api_path_scan_exit(clixon_api_path_yacc * ay)145 api_path_scan_exit(clixon_api_path_yacc *ay)
146 {
147 yy_delete_buffer(ay->ay_lexbuf);
148 clixon_api_path_parselex_destroy(); /* modern */
149 return 0;
150 }
151
152