Source Code Cross Referenced for Token.java in  » XML » saxonb » net » sf » saxon » expr » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » saxonb » net.sf.saxon.expr 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sf.saxon.expr;
002:
003:        import java.util.HashMap;
004:
005:        /**
006:         * This class holds static constants and methods defining the lexical tokens used in
007:         * XPath and XQuery, and associated keywords.
008:         */
009:
010:        public abstract class Token {
011:
012:            /**
013:             * Token numbers. Those in the range 0 to 100 are tokens that can be followed
014:             * by a name or expression; those in the range 101 to 200 are tokens that can be
015:             * followed by an binary operator.
016:             */
017:
018:            /**
019:             * Pseudo-token representing the end of the expression
020:             */
021:            public static final int EOF = 0;
022:            /**
023:             * "union" or "|" token
024:             */
025:            public static final int UNION = 1;
026:            /**
027:             * Forwards "/"
028:             */
029:            public static final int SLASH = 2;
030:            /**
031:             * At token, "@"
032:             */
033:            public static final int AT = 3;
034:            /**
035:             * Left square bracket
036:             */
037:            public static final int LSQB = 4;
038:            /**
039:             * Left parenthesis
040:             */
041:            public static final int LPAR = 5;
042:            /**
043:             * Equals token ("=")
044:             */
045:            public static final int EQUALS = 6;
046:            /**
047:             * Comma token
048:             */
049:            public static final int COMMA = 7;
050:            /**
051:             * Double forwards slash, "//"
052:             */
053:            public static final int SLSL = 8;
054:            /**
055:             * Operator "or"
056:             */
057:            public static final int OR = 9;
058:            /**
059:             * Operator "and"
060:             */
061:            public static final int AND = 10;
062:            /**
063:             * Operator ">"
064:             */
065:            public static final int GT = 11;
066:            /**
067:             * Operator "<"
068:             */
069:            public static final int LT = 12;
070:            /**
071:             * Operator ">="
072:             */
073:            public static final int GE = 13;
074:            /**
075:             * Operator "<="
076:             */
077:            public static final int LE = 14;
078:            /**
079:             * Operator "+"
080:             */
081:            public static final int PLUS = 15;
082:            /**
083:             * Binary minus operator
084:             */
085:            public static final int MINUS = 16;
086:            /**
087:             * Multiply operator, "*" when used in an operator context
088:             */
089:            public static final int MULT = 17;
090:            /**
091:             * Operator "div"
092:             */
093:            public static final int DIV = 18;
094:            /**
095:             * Operator "mod"
096:             */
097:            public static final int MOD = 19;
098:            /**
099:             * Operator "is"
100:             */
101:            public static final int IS = 20;
102:            /**
103:             * "$" symbol
104:             */
105:            public static final int DOLLAR = 21;
106:            /**
107:             * Operator not-equals. That is, "!="
108:             */
109:            public static final int NE = 22;
110:            /**
111:             * Operator "intersect"
112:             */
113:            public static final int INTERSECT = 23;
114:            /**
115:             * Operator "except"
116:             */
117:            public static final int EXCEPT = 24;
118:            /**
119:             * Keyword "return"
120:             */
121:            public static final int RETURN = 25;
122:            /**
123:             * Ketword "then"
124:             */
125:            public static final int THEN = 26;
126:            /**
127:             * Keyword "else"
128:             */
129:            public static final int ELSE = 27;
130:            /**
131:             * Keyword "where"
132:             */
133:            public static final int WHERE = 28;
134:            /**
135:             * Operator "to"
136:             */
137:            public static final int TO = 29;
138:            /**
139:             * Keyword "in"
140:             */
141:            public static final int IN = 30;
142:            /**
143:             * Keyword "some"
144:             */
145:            public static final int SOME = 31;
146:            /**
147:             * Keyword "every"
148:             */
149:            public static final int EVERY = 32;
150:            /**
151:             * Keyword "satisfies"
152:             */
153:            public static final int SATISFIES = 33;
154:            /**
155:             * Token representing the name of a function and the following "(" symbol
156:             */
157:            public static final int FUNCTION = 34;
158:            /**
159:             * Token representing the name of an axis and the following "::" symbol
160:             */
161:            public static final int AXIS = 35;
162:            /**
163:             * Keyword "if"
164:             */
165:            public static final int IF = 36;
166:            /**
167:             * Operator "<<"
168:             */
169:            public static final int PRECEDES = 37;
170:            /**
171:             * Operator ">>"
172:             */
173:            public static final int FOLLOWS = 38;
174:            /**
175:             * "::" symbol
176:             */
177:            public static final int COLONCOLON = 39;
178:            /**
179:             * ":*" symbol
180:             */
181:            public static final int COLONSTAR = 40;
182:            /**
183:             * operator "instance of"
184:             */
185:            public static final int INSTANCE_OF = 41;
186:            /**
187:             * operator "cast as"
188:             */
189:            public static final int CAST_AS = 42;
190:            /**
191:             * operator "treat as"
192:             */
193:            public static final int TREAT_AS = 43;
194:            /**
195:             * operator "eq"
196:             */
197:            public static final int FEQ = 44; // "Fortran" style comparison operators eq, ne, etc
198:            /**
199:             * operator "ne"
200:             */
201:            public static final int FNE = 45;
202:            /**
203:             * operator "gt"
204:             */
205:            public static final int FGT = 46;
206:            /**
207:             * operator "lt"
208:             */
209:            public static final int FLT = 47;
210:            /**
211:             * operator "ge"
212:             */
213:            public static final int FGE = 48;
214:            /**
215:             * opeartor "le"
216:             */
217:            public static final int FLE = 49;
218:            /**
219:             * operator "idiv"
220:             */
221:            public static final int IDIV = 50;
222:            /**
223:             * operator "castable as"
224:             */
225:            public static final int CASTABLE_AS = 51;
226:            /**
227:             * ":=" symbol (XQuery only)
228:             */
229:            public static final int ASSIGN = 52;
230:            /**
231:             * "{" symbol (XQuery only)
232:             */
233:            public static final int LCURLY = 53;
234:            /**
235:             * composite token: <keyword "{"> (XQuery only)
236:             */
237:            public static final int KEYWORD_CURLY = 54;
238:            /**
239:             * composite token <'element' QNAME> (XQuery only)
240:             */
241:            public static final int ELEMENT_QNAME = 55;
242:            /**
243:             * composite token <'attribute' QNAME> (XQuery only)
244:             */
245:            public static final int ATTRIBUTE_QNAME = 56;
246:            /**
247:             * composite token <'pi' QNAME> (XQuery only)
248:             */
249:            public static final int PI_QNAME = 57;
250:            /**
251:             * Keyword "typeswitch"
252:             */
253:            public static final int TYPESWITCH = 58;
254:            /**
255:             * Keyword "case"
256:             */
257:            public static final int CASE = 59;
258:            /**
259:             * Keyword "default"
260:             */
261:            public static final int DEFAULT = 60;
262:            /**
263:             * Node kind, e.g. "node()" or "comment()"
264:             */
265:            public static final int NODEKIND = 61;
266:            /**
267:             * "*:" token
268:             */
269:            public static final int SUFFIX = 62; // e.g. *:suffix - the suffix is actually a separate token
270:
271:            // The following tokens are used only in the query prolog. They are categorized
272:            // as operators on the basis that a following name is treated as a name rather than
273:            // an operator.
274:
275:            /**
276:             * "xquery version"
277:             */
278:            public static final int XQUERY_VERSION = 70;
279:            /**
280:             * "declare namespace"
281:             */
282:            public static final int DECLARE_NAMESPACE = 71;
283:            /**
284:             * "declare default"
285:             */
286:            public static final int DECLARE_DEFAULT = 72;
287:            /**
288:             * "declare construction"
289:             */
290:            public static final int DECLARE_CONSTRUCTION = 73;
291:            /**
292:             * "declare base-uri"
293:             */
294:            public static final int DECLARE_BASEURI = 74;
295:            /**
296:             * "declare boundary-space"
297:             */
298:            public static final int DECLARE_BOUNDARY_SPACE = 75;
299:            /**
300:             * "import schema"
301:             */
302:            public static final int IMPORT_SCHEMA = 76;
303:            /**
304:             * "import module"
305:             */
306:            public static final int IMPORT_MODULE = 77;
307:            /**
308:             * "define variable"
309:             */
310:            public static final int DECLARE_VARIABLE = 78;
311:            /**
312:             * "define function"
313:             */
314:            public static final int DECLARE_FUNCTION = 79;
315:            /**
316:             * "module namespace"
317:             */
318:            public static final int MODULE_NAMESPACE = 80;
319:            /**
320:             * Various compound symbols supporting XQuery validation expression
321:             */
322:            public static final int VALIDATE = 81;
323:            public static final int VALIDATE_STRICT = 82;
324:            public static final int VALIDATE_LAX = 83;
325:
326:            /**
327:             * "declare xmlspace"
328:             */
329:            public static final int DECLARE_ORDERING = 84;
330:
331:            /**
332:             * "declare copy-namespaces"
333:             */
334:            public static final int DECLARE_COPY_NAMESPACES = 85;
335:            /**
336:             * "declare option"
337:             */
338:            public static final int DECLARE_OPTION = 86;
339:            /**
340:             * semicolon separator
341:             */
342:            public static final int SEMICOLON = 90;
343:
344:            /**
345:             * Constant identifying the token number of the last token to be classified as an operator
346:             */
347:            static int LAST_OPERATOR = 100;
348:
349:            // Tokens that set "operator" context, so an immediately following "div" is recognized
350:            // as an operator, not as an element name
351:
352:            /**
353:             * Name token (a QName, in general)
354:             */
355:            public static final int NAME = 101;
356:            /**
357:             * String literal
358:             */
359:            public static final int STRING_LITERAL = 102;
360:            /**
361:             * Right square bracket
362:             */
363:            public static final int RSQB = 103;
364:            /**
365:             * Right parenthesis
366:             */
367:            public static final int RPAR = 104;
368:            /**
369:             * "." symbol
370:             */
371:            public static final int DOT = 105;
372:            /**
373:             * ".." symbol
374:             */
375:            public static final int DOTDOT = 106;
376:            /**
377:             * "*" symbol when used as a wildcard
378:             */
379:            public static final int STAR = 107;
380:            /**
381:             * "prefix:*" token
382:             */
383:            public static final int PREFIX = 108; // e.g. prefix:*
384:            /**
385:             * Numeric literal
386:             */
387:            public static final int NUMBER = 109;
388:
389:            /**
390:             * "for" keyword
391:             */
392:            public static final int FOR = 111;
393:            /**
394:             * Question mark symbol. That is, "?"
395:             */
396:            public static final int QMARK = 113;
397:            /**
398:             * "}" symbol (XQuery only)
399:             */
400:            public static final int RCURLY = 115;
401:            /**
402:             * "let" keyword (XQuery only)
403:             */
404:            public static final int LET = 116;
405:            /**
406:             * "<" at the start of a tag (XQuery only). The pseudo-XML syntax that
407:             * follows is read character-by-character by the XQuery parser
408:             */
409:            public static final int TAG = 117;
410:            /**
411:             * A token representing an XQuery pragma.
412:             * This construct "(# .... #)" is regarded as a single token, for the QueryParser to sort out.
413:             */
414:            public static final int PRAGMA = 118;
415:
416:            /**
417:             * Unary minus sign
418:             */
419:            public static final int NEGATE = 199; // unary minus: not actually a token, but we
420:            // use token numbers to identify operators.
421:
422:            /**
423:             * The following strings are used to represent tokens in error messages
424:             */
425:
426:            public static String[] tokens = new String[200];
427:            static {
428:                tokens[EOF] = "<eof>";
429:                tokens[UNION] = "|";
430:                tokens[SLASH] = "/";
431:                tokens[AT] = "@";
432:                tokens[LSQB] = "[";
433:                tokens[LPAR] = "(";
434:                tokens[EQUALS] = "=";
435:                tokens[COMMA] = ",";
436:                tokens[SLSL] = "//";
437:                tokens[OR] = "or";
438:                tokens[AND] = "and";
439:                tokens[GT] = ">";
440:                tokens[LT] = "<";
441:                tokens[GE] = ">=";
442:                tokens[LE] = "<=";
443:                tokens[PLUS] = "+";
444:                tokens[MINUS] = "-";
445:                tokens[MULT] = "*";
446:                tokens[DIV] = "div";
447:                tokens[MOD] = "mod";
448:                tokens[IS] = "is";
449:                tokens[DOLLAR] = "$";
450:                tokens[NE] = "!=";
451:                tokens[INTERSECT] = "intersect";
452:                tokens[EXCEPT] = "except";
453:                tokens[RETURN] = "return";
454:                tokens[THEN] = "then";
455:                tokens[ELSE] = "else";
456:                //tokens [ ISNOT ] = "isnot";
457:                tokens[TO] = "to";
458:                tokens[IN] = "in";
459:                tokens[SOME] = "some";
460:                tokens[EVERY] = "every";
461:                tokens[SATISFIES] = "satisfies";
462:                tokens[FUNCTION] = "<function>(";
463:                tokens[AXIS] = "<axis>";
464:                tokens[IF] = "if(";
465:                tokens[PRECEDES] = "<<";
466:                tokens[FOLLOWS] = ">>";
467:                tokens[COLONCOLON] = "::";
468:                tokens[COLONSTAR] = ":*";
469:                tokens[INSTANCE_OF] = "instance of";
470:                tokens[CAST_AS] = "cast as";
471:                tokens[TREAT_AS] = "treat as";
472:                tokens[FEQ] = "eq";
473:                tokens[FNE] = "ne";
474:                tokens[FGT] = "gt";
475:                tokens[FGE] = "ge";
476:                tokens[FLT] = "lt";
477:                tokens[FLE] = "le";
478:                tokens[IDIV] = "idiv";
479:                tokens[CASTABLE_AS] = "castable as";
480:                tokens[ASSIGN] = ":=";
481:                tokens[TYPESWITCH] = "typeswitch";
482:                tokens[CASE] = "case";
483:                tokens[DEFAULT] = "default";
484:
485:                tokens[NAME] = "<name>";
486:                tokens[STRING_LITERAL] = "<string-literal>";
487:                tokens[RSQB] = "]";
488:                tokens[RPAR] = ")";
489:                tokens[DOT] = ".";
490:                tokens[DOTDOT] = "..";
491:                tokens[STAR] = "*";
492:                tokens[PREFIX] = "<prefix:*>";
493:                tokens[NUMBER] = "<numeric-literal>";
494:                tokens[NODEKIND] = "<node-type>()";
495:                tokens[FOR] = "for";
496:                tokens[SUFFIX] = "<*:local-name>";
497:                tokens[QMARK] = "?";
498:                tokens[LCURLY] = "{";
499:                tokens[KEYWORD_CURLY] = "<keyword> {";
500:                tokens[RCURLY] = "}";
501:                tokens[LET] = "let";
502:                tokens[VALIDATE] = "validate {";
503:                tokens[TAG] = "<element>";
504:                tokens[PRAGMA] = "(# ... #)";
505:                tokens[SEMICOLON] = ";";
506:                tokens[NEGATE] = "-";
507:            }
508:
509:            /**
510:             * Lookup table for composite (two-keyword) tokens
511:             */
512:            public static HashMap doubleKeywords = new HashMap(30);
513:            /**
514:             * Pseudo-token representing the start of the expression
515:             */
516:            public static final int UNKNOWN = -1;
517:
518:            private Token() {
519:            }
520:
521:            static {
522:                mapDouble("instance of", INSTANCE_OF);
523:                mapDouble("cast as", CAST_AS);
524:                mapDouble("treat as", TREAT_AS);
525:                mapDouble("castable as", CASTABLE_AS);
526:                mapDouble("xquery version", XQUERY_VERSION);
527:                mapDouble("declare namespace", DECLARE_NAMESPACE);
528:                mapDouble("declare default", DECLARE_DEFAULT);
529:                mapDouble("declare construction", DECLARE_CONSTRUCTION);
530:                mapDouble("declare base-uri", DECLARE_BASEURI);
531:                mapDouble("declare boundary-space", DECLARE_BOUNDARY_SPACE);
532:                mapDouble("declare ordering", DECLARE_ORDERING);
533:                mapDouble("declare copy-namespaces", DECLARE_COPY_NAMESPACES);
534:                mapDouble("declare option", DECLARE_OPTION);
535:                mapDouble("import schema", IMPORT_SCHEMA);
536:                mapDouble("import module", IMPORT_MODULE);
537:                mapDouble("declare variable", DECLARE_VARIABLE);
538:                mapDouble("declare function", DECLARE_FUNCTION);
539:                mapDouble("module namespace", MODULE_NAMESPACE);
540:                mapDouble("validate strict", VALIDATE_STRICT);
541:                mapDouble("validate lax", VALIDATE_LAX);
542:
543:            }
544:
545:            private static void mapDouble(String doubleKeyword, int token) {
546:                doubleKeywords.put(doubleKeyword, new Integer(token));
547:                tokens[token] = doubleKeyword;
548:            }
549:
550:            /**
551:             * Return the inverse of a relational operator, so that "a op b" can be
552:             * rewritten as "b inverse(op) a"
553:             */
554:
555:            public static final int inverse(int operator) {
556:                switch (operator) {
557:                case LT:
558:                    return GT;
559:                case LE:
560:                    return GE;
561:                case GT:
562:                    return LT;
563:                case GE:
564:                    return LE;
565:                case FLT:
566:                    return FGT;
567:                case FLE:
568:                    return FGE;
569:                case FGT:
570:                    return FLT;
571:                case FGE:
572:                    return FLE;
573:                default:
574:                    return operator;
575:                }
576:            }
577:
578:            /**
579:             * Return the negation of a relational operator, so that "a op b" can be
580:             * rewritten as not(b op' a)
581:             */
582:
583:            public static final int negate(int operator) {
584:                switch (operator) {
585:                case FEQ:
586:                    return FNE;
587:                case FNE:
588:                    return FEQ;
589:                case FLT:
590:                    return FGE;
591:                case FLE:
592:                    return FGT;
593:                case FGT:
594:                    return FLE;
595:                case FGE:
596:                    return FLT;
597:                default:
598:                    throw new IllegalArgumentException(
599:                            "Invalid operator for negate()");
600:                }
601:            }
602:        }
603:
604:        //
605:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
606:        // you may not use this file except in compliance with the License. You may obtain a copy of the
607:        // License at http://www.mozilla.org/MPL/
608:        //
609:        // Software distributed under the License is distributed on an "AS IS" basis,
610:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
611:        // See the License for the specific language governing rights and limitations under the License.
612:        //
613:        // The Original Code is: all this file.
614:        //
615:        // The Initial Developer of the Original Code is Michael H. Kay.
616:        //
617:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
618:        //
619:        // Contributor(s): none.
620:        //
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