| /*------------------------------------------------------------------------- | |
| * | |
| * kwlookup.h | |
| * Key word lookup for PostgreSQL | |
| * | |
| * | |
| * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group | |
| * Portions Copyright (c) 1994, Regents of the University of California | |
| * | |
| * src/include/common/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 *str, 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]; | |
| } | |