uk.ac.gla.dcs.renaissance.iqir.parser
Class IQIRParser

java.lang.Object
  uk.ac.gla.dcs.renaissance.iqir.parser.IQIRParser

All Implemented Interfaces:

IQIRParserConstants

public class IQIRParser
extends Object
implements IQIRParserConstants

Nested Class Summary

static class

IQIRParser.SOperator

Field Summary

Token	jj_nt Next token.
Token	token Current token.
IQIRParserTokenManager	token_source Generated Token Manager.

Fields inherited from interface uk.ac.gla.dcs.renaissance.iqir.parser.IQIRParserConstants

ALPHANUMERICS, COMMA, DEFAULT, DIGIT, EOF, LBRACKET, LCURLY, LETTER, LETTERDIGITEXTRAS, LPAREN, MINUS, NUMBER, PLUS, QUOTES, RBRACKET, RCURLY, RPAREN, tokenImage, XML_NAME, XML_NAMECHAR, XML_TAG

Constructor Summary

IQIRParser(InputStream stream)
Constructor with InputStream.

IQIRParser(InputStream stream, String encoding)
Constructor with InputStream and supplied encoding

IQIRParser(IQIRParserTokenManager tm)
Constructor with generated Token Manager.

IQIRParser(Reader stream)
Constructor.

Method Summary

Token	alphanumeric() alphanumeric ::= ALPHANUMERICS
void	disable_tracing() Disable tracing.
void	enable_tracing() Enable tracing.
Operator	expr() Expression expr: operators (("+" | "-") operators)*
ParseException	generateParseException() Generate ParseException.
Token	getNextToken() Get the next Token.
Token	getToken(int index) Get the specific Token.
TopicOperator	iqirTopic() An IQIR topic is described by a set of tensors.
MultiTermOperator	multiterms() A multiterms is a sequence of words
Operator	operator() operator ::= ( ( LBRACKET operators RBRACKET ) | ( LPAREN expr RPAREN ) | ( QUOTES multiterms QUOTES ) )
Mixture	operators(boolean superpose) Operators
void	ReInit(InputStream stream) Reinitialise.
void	ReInit(InputStream stream, String encoding) Reinitialise.
void	ReInit(IQIRParserTokenManager tm) Reinitialise.
void	ReInit(Reader stream) Reinitialise.
List<Operator>	tensors() tensor: either {} ops or
TermOperator	word() A word is a sequence: of alphabetics, of digits, of digits preceeded by a negative (-) sign (a negative number).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

token_source

public IQIRParserTokenManager token_source

Generated Token Manager.

token

public Token token

Current token.

jj_nt

public Token jj_nt

Next token.

Constructor Detail

IQIRParser

public IQIRParser(InputStream stream)

Constructor with InputStream.

IQIRParser

public IQIRParser(InputStream stream,
                  String encoding)

Constructor with InputStream and supplied encoding

IQIRParser

public IQIRParser(Reader stream)

Constructor.

IQIRParser

public IQIRParser(IQIRParserTokenManager tm)

Constructor with generated Token Manager.

Method Detail

iqirTopic

public final TopicOperator iqirTopic()
                              throws ParseException,
                                     Exception

An IQIR topic is described by a set of tensors. Each of these tensors denotes an aspect of the information need which must be satisfied. < br/ >

iqir-topic ::= tensors (COMMA tensors)* EOF

Throws:

ParseException

Exception

tensors

public final List<Operator> tensors()
                             throws ParseException,
                                    Exception

tensor: either {} ops or

tensors ::= ((expr) | LCURLY expr (COMMA expr)* RCURLY (operators)?
            ((PLUS | MINUS) operators)* ) )

Throws:

ParseException

Exception

expr

public final Operator expr()
                    throws ParseException,
                           Exception

Expression
expr: operators (("+" | "-") operators)*

expr ::= operators (( PLUS | MINUS) operators)*

Throws:

ParseException

Exception

operators

public final Mixture operators(boolean superpose)
                        throws ParseException,
                               Exception

Operators

operators ::= (operator)+

Throws:

ParseException

Exception

operator

public final Operator operator()
                        throws ParseException,
                               Exception

operator ::= (  ( LBRACKET operators RBRACKET ) |
                ( LPAREN expr RPAREN ) |
                ( QUOTES multiterms QUOTES ) )

Throws:

ParseException

Exception

multiterms

public final MultiTermOperator multiterms()
                                   throws ParseException,
                                          Exception

A multiterms is a sequence of words

multiterms := (word)*

Throws:

ParseException

Exception

word

public final TermOperator word()
                        throws ParseException,
                               Exception

A word is a sequence: of alphabetics, of digits, of digits preceeded by a negative (-) sign (a negative number). Alphanumerics starting with an alpha (for both ip1 tags and Y2K queries). As the operators are also valid search terms, a word is operator or a sequence of alphabetic characters

word ::= (NUMBER | DIGIT | alphanumeric)

Throws:

ParseException

Exception

alphanumeric

public final Token alphanumeric()
                         throws ParseException,
                                Exception

alphanumeric ::= ALPHANUMERICS

Throws:

ParseException

Exception

ReInit

public void ReInit(InputStream stream)

Reinitialise.

ReInit

public void ReInit(InputStream stream,
                   String encoding)

Reinitialise.

ReInit

public void ReInit(Reader stream)

Reinitialise.

ReInit

public void ReInit(IQIRParserTokenManager tm)

Reinitialise.

getNextToken

public final Token getNextToken()

Get the next Token.

getToken

public final Token getToken(int index)

Get the specific Token.

generateParseException

public ParseException generateParseException()

Generate ParseException.

enable_tracing

public final void enable_tracing()

Enable tracing.

disable_tracing

public final void disable_tracing()

Disable tracing.