granicus.if.org Git - postgresql/blob - src/backend/parser/keywords.c

   1 /*-------------------------------------------------------------------------
   2  *
   3  * keywords.c--
   4  *        lexical token lookup for reserved words in postgres SQL
   5  *
   6  * Copyright (c) 1994, Regents of the University of California
   7  *
   8  *
   9  * IDENTIFICATION
  10  *        $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.44 1998/09/01 04:30:23 momjian Exp $
  11  *
  12  *-------------------------------------------------------------------------
  13  */
  14 #include <ctype.h>
  15 #include <string.h>
  16
  17 #include "postgres.h"
  18 #include "nodes/parsenodes.h"
  19 #include "nodes/pg_list.h"
  20 #include "parse.h"
  21 #include "parser/keywords.h"
  22 #include "utils/elog.h"
  23
  24 /*
  25  * List of (keyword-name, keyword-token-value) pairs.
  26  *
  27  * !!WARNING!!: This list must be sorted, because binary
  28  *               search is used to locate entries.
  29  */
  30 static ScanKeyword ScanKeywords[] = {
  31         /* name                                 value                   */
  32         {"abort", ABORT_TRANS},
  33         {"action", ACTION},
  34         {"add", ADD},
  35         {"after", AFTER},
  36         {"aggregate", AGGREGATE},
  37         {"all", ALL},
  38         {"alter", ALTER},
  39         {"analyze", ANALYZE},
  40         {"and", AND},
  41         {"any", ANY},
  42         {"archive", ARCHIVE},
  43         {"as", AS},
  44         {"asc", ASC},
  45         {"backward", BACKWARD},
  46         {"before", BEFORE},
  47         {"begin", BEGIN_TRANS},
  48         {"between", BETWEEN},
  49         {"binary", BINARY},
  50         {"both", BOTH},
  51         {"by", BY},
  52         {"cache", CACHE},
  53         {"cascade", CASCADE},
  54         {"cast", CAST},
  55         {"char", CHAR},
  56         {"character", CHARACTER},
  57         {"check", CHECK},
  58         {"close", CLOSE},
  59         {"cluster", CLUSTER},
  60         {"collate", COLLATE},
  61         {"column", COLUMN},
  62         {"commit", COMMIT},
  63         {"constraint", CONSTRAINT},
  64         {"copy", COPY},
  65         {"create", CREATE},
  66         {"createdb", CREATEDB},
  67         {"createuser", CREATEUSER},
  68         {"cross", CROSS},
  69         {"current", CURRENT},           /* 6.4 to 6.5 is migration time! CURRENT
  70                                                                  * will be removed in 6.5! Use OLD keyword
  71                                                                  * in rules. Jan */
  72         {"current_date", CURRENT_DATE},
  73         {"current_time", CURRENT_TIME},
  74         {"current_timestamp", CURRENT_TIMESTAMP},
  75         {"current_user", CURRENT_USER},
  76         {"cursor", CURSOR},
  77         {"cycle", CYCLE},
  78         {"database", DATABASE},
  79         {"day", DAY_P},
  80         {"decimal", DECIMAL},
  81         {"declare", DECLARE},
  82         {"default", DEFAULT},
  83         {"delete", DELETE},
  84         {"delimiters", DELIMITERS},
  85         {"desc", DESC},
  86         {"distinct", DISTINCT},
  87         {"do", DO},
  88         {"double", DOUBLE},
  89         {"drop", DROP},
  90         {"each", EACH},
  91         {"encoding", ENCODING},
  92         {"end", END_TRANS},
  93         {"execute", EXECUTE},
  94         {"exists", EXISTS},
  95         {"explain", EXPLAIN},
  96         {"extend", EXTEND},
  97         {"extract", EXTRACT},
  98         {"false", FALSE_P},
  99         {"fetch", FETCH},
 100         {"float", FLOAT},
 101         {"for", FOR},
 102         {"foreign", FOREIGN},
 103         {"forward", FORWARD},
 104         {"from", FROM},
 105         {"full", FULL},
 106         {"function", FUNCTION},
 107         {"grant", GRANT},
 108         {"group", GROUP},
 109         {"handler", HANDLER},
 110         {"having", HAVING},
 111         {"hour", HOUR_P},
 112         {"in", IN},
 113         {"increment", INCREMENT},
 114         {"index", INDEX},
 115         {"inherits", INHERITS},
 116         {"inner", INNER_P},
 117         {"insert", INSERT},
 118         {"instead", INSTEAD},
 119         {"interval", INTERVAL},
 120         {"into", INTO},
 121         {"is", IS},
 122         {"isnull", ISNULL},
 123         {"join", JOIN},
 124         {"key", KEY},
 125         {"lancompiler", LANCOMPILER},
 126         {"language", LANGUAGE},
 127         {"leading", LEADING},
 128         {"left", LEFT},
 129         {"like", LIKE},
 130         {"listen", LISTEN},
 131         {"load", LOAD},
 132         {"local", LOCAL},
 133         {"location", LOCATION},
 134         {"lock", LOCK_P},
 135         {"match", MATCH},
 136         {"maxvalue", MAXVALUE},
 137         {"minute", MINUTE_P},
 138         {"minvalue", MINVALUE},
 139         {"month", MONTH_P},
 140         {"move", MOVE},
 141         {"names", NAMES},
 142         {"national", NATIONAL},
 143         {"natural", NATURAL},
 144         {"nchar", NCHAR},
 145         {"new", NEW},
 146         {"no", NO},
 147         {"nocreatedb", NOCREATEDB},
 148         {"nocreateuser", NOCREATEUSER},
 149         {"none", NONE},
 150         {"not", NOT},
 151         {"nothing", NOTHING},
 152         {"notify", NOTIFY},
 153         {"notnull", NOTNULL},
 154         {"null", NULL_P},
 155         {"numeric", NUMERIC},
 156         {"oids", OIDS},
 157         {"old", CURRENT},
 158         {"on", ON},
 159         {"operator", OPERATOR},
 160         {"option", OPTION},
 161         {"or", OR},
 162         {"order", ORDER},
 163         {"outer", OUTER_P},
 164         {"partial", PARTIAL},
 165         {"password", PASSWORD},
 166         {"position", POSITION},
 167         {"precision", PRECISION},
 168         {"primary", PRIMARY},
 169         {"privileges", PRIVILEGES},
 170         {"procedural", PROCEDURAL},
 171         {"procedure", PROCEDURE},
 172         {"public", PUBLIC},
 173         {"recipe", RECIPE},
 174         {"references", REFERENCES},
 175         {"rename", RENAME},
 176         {"reset", RESET},
 177         {"returns", RETURNS},
 178         {"revoke", REVOKE},
 179         {"right", RIGHT},
 180         {"rollback", ROLLBACK},
 181         {"row", ROW},
 182         {"rule", RULE},
 183         {"second", SECOND_P},
 184         {"select", SELECT},
 185         {"sequence", SEQUENCE},
 186         {"serial", SERIAL},
 187         {"set", SET},
 188         {"setof", SETOF},
 189         {"show", SHOW},
 190         {"start", START},
 191         {"statement", STATEMENT},
 192         {"stdin", STDIN},
 193         {"stdout", STDOUT},
 194         {"substring", SUBSTRING},
 195         {"table", TABLE},
 196         {"time", TIME},
 197         {"timezone_hour", TIMEZONE_HOUR},
 198         {"timezone_minute", TIMEZONE_MINUTE},
 199         {"to", TO},
 200         {"trailing", TRAILING},
 201         {"transaction", TRANSACTION},
 202         {"trigger", TRIGGER},
 203         {"trim", TRIM},
 204         {"true", TRUE_P},
 205         {"trusted", TRUSTED},
 206         {"type", TYPE_P},
 207         {"union", UNION},
 208         {"unique", UNIQUE},
 209         {"unlisten", UNLISTEN},
 210         {"until", UNTIL},
 211         {"update", UPDATE},
 212         {"user", USER},
 213         {"using", USING},
 214         {"vacuum", VACUUM},
 215         {"valid", VALID},
 216         {"values", VALUES},
 217         {"varchar", VARCHAR},
 218         {"varying", VARYING},
 219         {"verbose", VERBOSE},
 220         {"version", VERSION},
 221         {"view", VIEW},
 222         {"where", WHERE},
 223         {"with", WITH},
 224         {"work", WORK},
 225         {"year", YEAR_P},
 226         {"zone", ZONE},
 227 };
 228
 229 ScanKeyword *
 230 ScanKeywordLookup(char *text)
 231 {
 232         ScanKeyword *low = &ScanKeywords[0];
 233         ScanKeyword *high = endof(ScanKeywords) - 1;
 234         ScanKeyword *middle;
 235         int                     difference;
 236
 237         while (low <= high)
 238         {
 239                 middle = low + (high - low) / 2;
 240                 difference = strcmp(middle->name, text);
 241                 if (difference == 0)
 242                         return middle;
 243                 else if (difference < 0)
 244                         low = middle + 1;
 245                 else
 246                         high = middle - 1;
 247         }
 248
 249         return NULL;
 250 }