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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 1.31.2.1 2005/12/02 15:04:48 meskes 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 ScanKeyword ScanKeywords[] = {
/* name value */
{"allocate", SQL_ALLOCATE},
{"autocommit", SQL_AUTOCOMMIT},
{"bool", SQL_BOOL},
{"break", SQL_BREAK},
{"call", SQL_CALL},
{"cardinality", SQL_CARDINALITY},
{"connect", SQL_CONNECT},
{"continue", SQL_CONTINUE},
{"count", SQL_COUNT},
{"current", SQL_CURRENT},
{"data", SQL_DATA},
{"datetime_interval_code", SQL_DATETIME_INTERVAL_CODE},
{"datetime_interval_precision", SQL_DATETIME_INTERVAL_PRECISION},
{"describe", SQL_DESCRIBE},
{"descriptor", SQL_DESCRIPTOR},
{"disconnect", SQL_DISCONNECT},
{"enum", SQL_ENUM},
{"found", SQL_FOUND},
{"free", SQL_FREE},
{"go", SQL_GO},
{"goto", SQL_GOTO},
{"identified", SQL_IDENTIFIED},
{"indicator", SQL_INDICATOR},
{"key_member", SQL_KEY_MEMBER},
{"length", SQL_LENGTH},
{"long", SQL_LONG},
{"name", SQL_NAME},
{"nullable", SQL_NULLABLE},
{"octet_length", SQL_OCTET_LENGTH},
{"open", SQL_OPEN},
{"output", SQL_OUTPUT},
{"reference", SQL_REFERENCE},
{"returned_length", SQL_RETURNED_LENGTH},
{"returned_octet_length", SQL_RETURNED_OCTET_LENGTH},
{"scale", SQL_SCALE},
{"section", SQL_SECTION},
{"short", SQL_SHORT},
{"signed", SQL_SIGNED},
{"sql", SQL_SQL}, /* strange thing, used for into sql descriptor
* MYDESC; */
{"sqlerror", SQL_SQLERROR},
{"sqlprint", SQL_SQLPRINT},
{"sqlwarning", SQL_SQLWARNING},
{"stop", SQL_STOP},
{"struct", SQL_STRUCT},
{"unsigned", SQL_UNSIGNED},
{"value", SQL_VALUE},
{"var", SQL_VAR},
{"whenever", SQL_WHENEVER},
};
/*
* 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.
*/
ScanKeyword *
ScanECPGKeywordLookup(char *text)
{
int len,
i;
char word[NAMEDATALEN];
ScanKeyword *low;
ScanKeyword *high;
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), and we
* don't trust isupper() very much either. In an ASCII-based encoding the
* tests against A and Z are sufficient, but we also check isupper() so
* that we will work correctly under EBCDIC. The actual case conversion
* step should work for either ASCII or EBCDIC.
*/
for (i = 0; i < len; i++)
{
char ch = text[i];
if (ch >= 'A' && ch <= 'Z' && isupper((unsigned char) ch))
ch += 'a' - 'A';
word[i] = ch;
}
word[len] = '\0';
/*
* Now do a binary search using plain strcmp() comparison.
*/
low = &ScanKeywords[0];
high = endof(ScanKeywords) - 1;
while (low <= high)
{
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;
}
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