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/*-------------------------------------------------------------------------
*
* ecpg_keywords.c
* lexical token lookup for reserved words in postgres embedded SQL
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/interfaces/ecpg/preproc/ecpg_keywords.c,v 1.40 2009/06/11 14:49:13 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres_fe.h"
#include <ctype.h>
#include "extern.h"
#include "preproc.h"
/*
* List of (keyword-name, keyword-token-value) pairs.
*
* !!WARNING!!: This list must be sorted, because binary
* search is used to locate entries.
*/
static const ScanKeyword ScanECPGKeywords[] = {
/* name, value, category */
/*
* category is not needed in ecpg, it is only here so we can share the
* data structure with the backend
*/
{"allocate", SQL_ALLOCATE, 0},
{"autocommit", SQL_AUTOCOMMIT, 0},
{"bool", SQL_BOOL, 0},
{"break", SQL_BREAK, 0},
{"call", SQL_CALL, 0},
{"cardinality", SQL_CARDINALITY, 0},
{"connect", SQL_CONNECT, 0},
{"count", SQL_COUNT, 0},
{"datetime_interval_code", SQL_DATETIME_INTERVAL_CODE, 0},
{"datetime_interval_precision", SQL_DATETIME_INTERVAL_PRECISION, 0},
{"describe", SQL_DESCRIBE, 0},
{"descriptor", SQL_DESCRIPTOR, 0},
{"disconnect", SQL_DISCONNECT, 0},
{"found", SQL_FOUND, 0},
{"free", SQL_FREE, 0},
{"get", SQL_GET, 0},
{"go", SQL_GO, 0},
{"goto", SQL_GOTO, 0},
{"identified", SQL_IDENTIFIED, 0},
{"indicator", SQL_INDICATOR, 0},
{"key_member", SQL_KEY_MEMBER, 0},
{"length", SQL_LENGTH, 0},
{"long", SQL_LONG, 0},
{"nullable", SQL_NULLABLE, 0},
{"octet_length", SQL_OCTET_LENGTH, 0},
{"open", SQL_OPEN, 0},
{"output", SQL_OUTPUT, 0},
{"reference", SQL_REFERENCE, 0},
{"returned_length", SQL_RETURNED_LENGTH, 0},
{"returned_octet_length", SQL_RETURNED_OCTET_LENGTH, 0},
{"scale", SQL_SCALE, 0},
{"section", SQL_SECTION, 0},
{"short", SQL_SHORT, 0},
{"signed", SQL_SIGNED, 0},
{"sql", SQL_SQL, 0}, /* strange thing, used for into sql descriptor
* MYDESC; */
{"sqlerror", SQL_SQLERROR, 0},
{"sqlprint", SQL_SQLPRINT, 0},
{"sqlwarning", SQL_SQLWARNING, 0},
{"stop", SQL_STOP, 0},
{"struct", SQL_STRUCT, 0},
{"unsigned", SQL_UNSIGNED, 0},
{"var", SQL_VAR, 0},
{"whenever", SQL_WHENEVER, 0},
};
/* This is all taken from src/backend/parser/keyword.c and adjusted for our needs. */
/*
* Do a binary search using plain strcmp() comparison.
*/
const ScanKeyword *
DoLookup(const char *word, const ScanKeyword *low, const ScanKeyword *high)
{
while (low <= high)
{
const ScanKeyword *middle;
int difference;
middle = low + (high - low) / 2;
difference = strcmp(middle->name, word);
if (difference == 0)
return middle;
else if (difference < 0)
low = middle + 1;
else
high = middle - 1;
}
return NULL;
}
/*
* ScanECPGKeywordLookup - see if a given word is a keyword
*
* Returns a pointer to the ScanKeyword table entry, or NULL if no match.
*
* The match is done case-insensitively. Note that we deliberately use a
* dumbed-down case conversion that will only translate 'A'-'Z' into 'a'-'z',
* even if we are in a locale where tolower() would produce more or different
* translations. This is to conform to the SQL99 spec, which says that
* keywords are to be matched in this way even though non-keyword identifiers
* receive a different case-normalization mapping.
*/
const ScanKeyword *
ScanECPGKeywordLookup(const char *text)
{
int len,
i;
char word[NAMEDATALEN];
const ScanKeyword *res;
/* First check SQL symbols defined by the backend. */
res = ScanKeywordLookup(text);
if (res)
return res;
len = strlen(text);
/* We assume all keywords are shorter than NAMEDATALEN. */
if (len >= NAMEDATALEN)
return NULL;
/*
* Apply an ASCII-only downcasing. We must not use tolower() since it may
* produce the wrong translation in some locales (eg, Turkish).
*/
for (i = 0; i < len; i++)
{
char ch = text[i];
if (ch >= 'A' && ch <= 'Z')
ch += 'a' - 'A';
word[i] = ch;
}
word[len] = '\0';
/*
* Now do a binary search using plain strcmp() comparison.
*/
return DoLookup(word, &ScanECPGKeywords[0], endof(ScanECPGKeywords) - 1);
}
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