gnu.java.util.regex
Interface CharIndexed
Defines the interface used internally so that different types of source
text can be accessed in the same way. Built-in concrete classes provide
support for String, StringBuffer, InputStream and char[] types.
A class that is CharIndexed supports the notion of a cursor within a
block of text. The cursor must be able to be advanced via the move()
method. The charAt() method returns the character at the cursor position
plus a given offset.
static char | OUT_OF_BOUNDS- Defines a constant (0xFFFF was somewhat arbitrarily chosen)
that can be returned by the charAt() function indicating that
the specified index is out of range.
|
char | charAt(int index)- Returns the character at the given offset past the current cursor
position in the input.
|
int | getAnchor()- Returns the anchor.
|
REMatch | getLastMatch()- Returns the REMatch last found on this input.
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boolean | hitEnd()- Returns whether the matcher has hit the end of input.
|
boolean | isValid()- Returns true if the most recent move() operation placed the cursor
position at a valid position in the input.
|
int | length()- Returns the effective length of this CharIndexed
|
CharIndexed | lookBehind(int index, int length)- Returns another CharIndexed containing length characters to the left
of the given index.
|
boolean | move(int index)- Shifts the input buffer by a given number of positions.
|
boolean | move1(int index)- Shifts the input buffer by a given number of positions.
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void | setAnchor(int anchor)- Sets the anchor.
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void | setHitEnd(REMatch match)- Sets the information used for hitEnd().
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void | setLastMatch(REMatch match)- Sets the REMatch last found on this input.
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OUT_OF_BOUNDS
public static final char OUT_OF_BOUNDS
Defines a constant (0xFFFF was somewhat arbitrarily chosen)
that can be returned by the charAt() function indicating that
the specified index is out of range.
charAt
public char charAt(int index)
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).
index - the offset position in the character field to examine
- the character at the specified index, or the OUT_OF_BOUNDS
character defined by this interface.
getAnchor
public int getAnchor()
Returns the anchor.
hitEnd
public boolean hitEnd()
Returns whether the matcher has hit the end of input.
isValid
public boolean isValid()
Returns true if the most recent move() operation placed the cursor
position at a valid position in the input.
length
public int length()
Returns the effective length of this CharIndexed
lookBehind
public CharIndexed lookBehind(int index,
int length) Returns another CharIndexed containing length characters to the left
of the given index. The given length is an expected maximum and
the returned CharIndexed may not necessarily contain so many characters.
move
public boolean move(int index)
Shifts the input buffer by a given number of positions. Returns
true if the new cursor position is valid.
move1
public boolean move1(int index)
Shifts the input buffer by a given number of positions. Returns
true if the new cursor position is valid or cursor position is at
the end of input.
setAnchor
public void setAnchor(int anchor)
Sets the anchor.
setHitEnd
public void setHitEnd(REMatch match)
Sets the information used for hitEnd().
gnu/regexp/CharIndexed.java
Copyright (C) 1998-2001, 2004, 2006 Free Software Foundation, Inc.
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