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/*
IXAttributeReader.h
Copyright 1991, NeXT Computer, Inc.
*/
#import <objc/Object.h>
#import <objc/hashtable.h>
@class List;
/* This protocol is adopted by subclasses that wish to perform special case */
/* folding or lexeme extraction. The IXJapaneseLexer in the Kanji version of */
/* the library is a case in point, since the Kanji encodings involve shifting*/
/* between one and two by character representations.*/
@protocol IXLexemeExtraction
- (unsigned)foldCase:(char *)string inLength:(unsigned)length;
- (unsigned)getLexeme:(char *)string inLength:(unsigned)length
fromStream:(NXStream *)stream;
@end
@interface IXAttributeReader: Object
{
NXHashTable *stopWords; /* these words removed from output*/
const char *punctuation; /* characters that delimit words*/
unsigned char *charMapping; /* table for mapping characters*/
struct {
unsigned caseFolding:1; /* fold upper case to lower case*/
unsigned pluralFolding:1; /* fold plural to singular form*/
unsigned stemsReduced:1; /* reduce words to their stems*/
unsigned tokenUniquing:1; /* unique tokens to pack output*/
} booleanOptions;
}
/* analyzes a stream, returning Attribute Reader Format.*/
- (NXStream *)analyzeStream:(NXStream *)stream;
- (unsigned)foldPlural:(char *)string inLength:(unsigned)length;
- (unsigned)reduceStem:(char *)string inLength:(unsigned)length;
@end
@interface IXAttributeReader(Configuration)
- (BOOL)isCaseFolded; /* true if case folding enabled*/
- setCaseFolded:(BOOL)flag; /* enables or disables case folding*/
- (BOOL)arePluralsFolded; /* true if plural folding enabled*/
- setPluralsFolded:(BOOL)flag; /* enables or disables plural folding*/
- (BOOL)areStemsReduced; /* true if stem removal enabled*/
- setStemsReduced:(BOOL)flag; /* enables or disables stem removal*/
- (char *)punctuation; /* returns currently defined token delimiters*/
- setPunctuation:(const char *)string; /* sets token delimiters*/
- (char *)stopWords; /* returns newline delimited stop word string*/
- setStopWords:(const char *)string; /* sets stop words*/
- readStopWords:(NXStream *)stream; /* reads stop words from a stream*/
- writeStopWords:(NXStream *)stream; /* writes stop words to a stream*/
- readStopWordsFromFile:(const char *)filename; /* reads stop words from a file*/
- writeStopWordsToFile:(const char *)filename; /* writes stop words to a file*/
@end
/* The following protocol is obselete, and may be not be defined in future */
/* releases. The methods are now declared by the classes that implement them.*/
@protocol IXAttributeReading
- (NXStream *)analyzeStream:(NXStream *)stream;
@end
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.