2 * Copyright (c) 2015 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
20 /* OVN lexical analyzer
21 * ====================
23 * This is a simple lexical analyzer (or tokenizer) for OVN match expressions
26 #include "meta-flow.h"
32 LEX_T_END, /* end of input */
34 /* Tokens with auxiliary data. */
36 LEX_T_STRING, /* "foo" */
37 LEX_T_INTEGER, /* 12345 or 1.2.3.4 or ::1 or 01:02:03:04:05 */
38 LEX_T_MASKED_INTEGER, /* 12345/10 or 1.2.0.0/16 or ::2/127 or... */
39 LEX_T_ERROR, /* invalid input */
46 LEX_T_LSQUARE, /* [ */
47 LEX_T_RSQUARE, /* ] */
54 LEX_T_LOG_NOT, /* ! */
55 LEX_T_LOG_AND, /* && */
56 LEX_T_LOG_OR, /* || */
57 LEX_T_ELLIPSIS, /* .. */
59 LEX_T_SEMICOLON, /* ; */
63 /* Subtype for LEX_T_INTEGER and LEX_T_MASKED_INTEGER tokens.
65 * These do not change the semantics of a token; instead, they determine the
66 * format used when a token is serialized back to a text form. That's
67 * important because 3232268289 is meaningless to a human whereas 192.168.128.1
68 * has some actual significance. */
76 const char *lex_format_to_string(enum lex_format);
80 * 's' is owned by the token. */
82 enum lex_type type; /* One of LEX_*. */
83 char *s; /* LEX_T_ID, LEX_T_STRING, LEX_T_ERROR only. */
84 enum lex_format format; /* LEX_T_INTEGER, LEX_T_MASKED_INTEGER only. */
85 union mf_subvalue value; /* LEX_T_INTEGER, LEX_T_MASKED_INTEGER only. */
86 union mf_subvalue mask; /* LEX_T_MASKED_INTEGER only. */
89 void lex_token_init(struct lex_token *);
90 void lex_token_destroy(struct lex_token *);
91 void lex_token_swap(struct lex_token *, struct lex_token *);
93 void lex_token_format(const struct lex_token *, struct ds *);
94 const char *lex_token_parse(struct lex_token *, const char *input,
97 /* A lexical analyzer. */
99 const char *input; /* Remaining input (not owned by lexer). */
100 const char *start; /* Start of current token in 'input'. */
101 struct lex_token token; /* Current token (owned by lexer). */
104 void lexer_init(struct lexer *, const char *input);
105 void lexer_destroy(struct lexer *);
107 enum lex_type lexer_get(struct lexer *);
108 enum lex_type lexer_lookahead(const struct lexer *);
109 bool lexer_match(struct lexer *, enum lex_type);
110 bool lexer_match_id(struct lexer *, const char *id);
112 #endif /* ovn/lex.h */