org.jacop.util.fsm

Class RegularExpressionParser

java.lang.Object

org.jacop.util.fsm.RegularExpressionParser

public class RegularExpressionParser
extends Object

Instances of this class parse the word combination little language.

Version:

4.9

Author:

Polina Makeeva and Radoslaw Szymanek

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	RegularExpressionParser.Expression It creates an abstract class expression which specifies basic methods of the expression.
class	RegularExpressionParser.Literal It specifies a simple literal.
static class	RegularExpressionParser.SyntaxException SyntaxException raised if not regular expression is being parsed.

Field Summary

Fields

Modifier and Type	Field and Description
static int	Concatenation The constant denoting concatenation expression.
static int	Expression Constant denoting an expression.
static int	Literal The constant denoting simple literal.
static int	Star The constant denoting star expression.
static int	Sum The constant denoting sum expression.

Constructor Summary

Constructors

Constructor and Description
RegularExpressionParser(StringReader input) It constructs a parser of the regular expression.

Method Summary

Modifier and Type	Method and Description
RegularExpressionParser.Expression	parse(boolean parseOneNext) This method parses an expression that it reads from a given input stream.

Methods inherited from class java.lang.Object

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

Field Detail

Expression

public static final int Expression

Constant denoting an expression.

See Also:

Constant Field Values

Literal

public static final int Literal

The constant denoting simple literal.

See Also:

Constant Field Values

Concatenation

public static final int Concatenation

The constant denoting concatenation expression.

See Also:

Constant Field Values

Star

public static final int Star

The constant denoting star expression.

See Also:

Constant Field Values

Sum

public static final int Sum

The constant denoting sum expression.

See Also:

Constant Field Values

Constructor Detail

RegularExpressionParser

public RegularExpressionParser(StringReader input)
                        throws RegularExpressionParser.SyntaxException

It constructs a parser of the regular expression.

Parameters:

input - string reader containing the regular expression.

Throws:

RegularExpressionParser.SyntaxException - if first token is neither word or left parenthesis.

Method Detail

parse

public RegularExpressionParser.Expression parse(boolean parseOneNext)
                                         throws RegularExpressionParser.SyntaxException

This method parses an expression that it reads from a given input stream.

Parameters:

parseOneNext - if parsing should parse only one item.

Returns:

An expression that is the root of the parse tree produced by the parser.

Throws:

RegularExpressionParser.SyntaxException - execption rised when syntax is not followed