edu.washington.cs.knowitall.regex

Class RegularExpressionParser<E>

java.lang.Object

edu.washington.cs.knowitall.regex.RegularExpressionParser<E>

Type Parameters:

E - the type of the sequence elements

All Implemented Interfaces:

com.google.common.base.Function<String,RegularExpression<E>>

public abstract class RegularExpressionParser<E>
extends Object
implements com.google.common.base.Function<String,RegularExpression<E>>

A regular expression parser turns strings into RegularExpression objects.

Author:

Michael Schmitz

Constructor Summary

Constructors

Constructor and Description
RegularExpressionParser()

Method Summary

Methods

Modifier and Type	Method and Description
RegularExpression<E>	apply(String string)
abstract Expression.BaseExpression<E>	factory(String token) The factory method creates an expression from the supplied token string.
RegularExpression<E>	parse(String string)
String	readToken(String remaining) Read a token from the remaining text and return it.
List<Expression<E>>	tokenize(String string) Convert a list of tokens (<...>) to a list of expressions.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.google.common.base.Function

equals

Constructor Detail

RegularExpressionParser

public RegularExpressionParser()

Method Detail

factory

public abstract Expression.BaseExpression<E> factory(String token)

The factory method creates an expression from the supplied token string.

Parameters:

token - a string representation of a token

Returns:

an evaluatable representation of a token

parse

public RegularExpression<E> parse(String string)

apply

public RegularExpression<E> apply(String string)

Specified by:

apply in interface com.google.common.base.Function<String,RegularExpression<E>>

readToken

public String readToken(String remaining)

Read a token from the remaining text and return it. This is a default implementation that is overridable. In the default implementation, the starting and ending token characters are not escapable. If this implemenation is overridden, A token MUST ALWAYS start with '<' or '[' and end with '>' or ']'.

Parameters:

remaining -

Returns:

tokenize

public List<Expression<E>> tokenize(String string)

Convert a list of tokens (<...>) to a list of expressions.

Parameters:

tokens -

factory - Factory class to create a BaseExpression from the text between angled brackets.

Returns: