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69 lines
2.6 KiB
69 lines
2.6 KiB
2 years ago
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/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 1997 - July 2008 CWI, August 2008 - 2022 MonetDB B.V.
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*/
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#ifndef _SQL_SCAN_H_
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#define _SQL_SCAN_H_
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#include "sql_mem.h"
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#include "sql_list.h"
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#include "stream.h"
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typedef enum { LINE_1, LINE_N } prot;
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struct scanner {
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bstream *rs;
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stream *ws;
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stream *log;
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int yynext; /* next token, lr(1) isn't powerful enough for sql */
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int yylast; /* previous token, to detect superfluous semi-colons */
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int yyval; /* current token */
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size_t yysval; /* start of current token */
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size_t yycur; /* next char in the queue */
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size_t as; /* start of query part of view's etc */
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char yybak; /* sometimes it's needed to write an EOS marker */
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int started; /* found at least one token */
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prot mode; /* which mode (line (1,N), blocked) */
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char *schema; /* Keep schema name of create statement, needed AUTO_INCREMENT, SERIAL */
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char *errstr; /* error message from the bowels of the scanner */
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/* Currently, MonetDB interprets \ specially in strings. This is contrary
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* to the SQL standard. The default behavior of the reader is controlled by
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* ``raw_strings`` mserver5 option (``--set raw_strings=<true|false>``) and
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* the database property of the same name of merovingian (``monetdb set
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* raw_strings=yes <database>``). If it is ``true`` by default the reader
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* interprets strings as specified in the SQL standard, i.e. no
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* interpretation of the \ characters. If it is ``false`` \ characters are
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* used for escaping.
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*
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* The default value of this setting is false as of the Jul2021 release,
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* i.e. MonetDB by default interprets \ in strings.
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*
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* In case that we are interpreting \ in strings, we need state in the
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* scanner so that we Do The Right Thing (TM) when we get a unicode string
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* split up in multiple parts (i.e. U&'string1' 'string2') where the second
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* and subsequent string MUST NOT undergo \ interpretation.
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*
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* Because we need to be backward compatible (i.e. we need have ``select
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* char_length('a\nb')`` return 3) the next 2 members will probably stay for
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* the forseeable future.
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*/
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bool next_string_is_raw;
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bool raw_string_mode;
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};
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#define QUERY(scanner) (scanner.rs->buf+scanner.rs->pos)
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extern char *query_cleaned(sql_allocator *sa, const char *query);
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extern void scanner_init(struct scanner *s, bstream *rs, stream *ws);
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sql_export void scanner_query_processed(struct scanner *s);
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extern int scanner_init_keywords(void);
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#endif /* _SQL_SCAN_H_ */
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