Package gnu.regexp

Class CharIndexedString

java.lang.Object

gnu.regexp.CharIndexedString

All Implemented Interfaces:

CharIndexed, java.io.Serializable

class CharIndexedString
extends java.lang.Object
implements CharIndexed, java.io.Serializable

Field Summary

Fields inherited from interface gnu.regexp.CharIndexed

OUT_OF_BOUNDS

Constructor Summary

Constructors

Constructor	Description
CharIndexedString(java.lang.String str, int index)

Method Summary

Modifier and Type	Method	Description
char	charAt(int index)	Returns the character at the given offset past the current cursor position in the input.
boolean	isValid()	Returns true if the most recent move() operation placed the cursor position at a valid position in the input.
boolean	move(int index)	Shifts the input buffer by a given number of positions.

Methods inherited from class java.lang.Object

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

Constructor Detail

CharIndexedString

CharIndexedString(java.lang.String str,
                  int index)

Method Detail

charAt

public char charAt(int index)

Description copied from interface: CharIndexed

Returns the character at the given offset past the current cursor position in the input. The index of the current position is zero. It is possible for this method to be called with a negative index. This happens when using the '^' operator in multiline matching mode or the '\b' or '\<' word boundary operators. In any case, the lower bound is currently fixed at -2 (for '^' with a two-character newline).

Specified by:

charAt in interface CharIndexed

Parameters:

index - the offset position in the character field to examine

Returns:

the character at the specified index, or the OUT_OF_BOUNDS character defined by this interface.

isValid

public boolean isValid()

Description copied from interface: CharIndexed

Returns true if the most recent move() operation placed the cursor position at a valid position in the input.

Specified by:

isValid in interface CharIndexed

move

public boolean move(int index)

Description copied from interface: CharIndexed

Shifts the input buffer by a given number of positions. Returns true if the new cursor position is valid.

Specified by:

move in interface CharIndexed