greenplumn kwlookup 源码
greenplumn kwlookup 代码
文件路径：/src/include/common/kwlookup.h
/*-------------------------------------------------------------------------
*
* kwlookup.h
* Key word lookup for PostgreSQL
*
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/common/kwlookup.h
*
*-------------------------------------------------------------------------
*/
#ifndef KWLOOKUP_H
#define KWLOOKUP_H
/* Hash function used by ScanKeywordLookup */
typedef int (*ScanKeywordHashFunc) (const void *key, size_t keylen);
/*
* This struct contains the data needed by ScanKeywordLookup to perform a
* search within a set of keywords. The contents are typically generated by
* src/tools/gen_keywordlist.pl from a header containing PG_KEYWORD macros.
*/
typedef struct ScanKeywordList
{
const char *kw_string; /* all keywords in order, separated by \0 */
const uint16 *kw_offsets; /* offsets to the start of each keyword */
ScanKeywordHashFunc hash; /* perfect hash function for keywords */
int num_keywords; /* number of keywords */
int max_kw_len; /* length of longest keyword */
} ScanKeywordList;
extern int ScanKeywordLookup(const char *text, const ScanKeywordList *keywords);
/* Code that wants to retrieve the text of the N'th keyword should use this. */
static inline const char *
GetScanKeyword(int n, const ScanKeywordList *keywords)
{
return keywords->kw_string + keywords->kw_offsets[n];
}
#endif /* KWLOOKUP_H */
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