Package org.parboiled.buffers

Class DefaultInputBuffer

java.lang.Object

org.parboiled.buffers.DefaultInputBuffer

All Implemented Interfaces:

InputBuffer

public class DefaultInputBuffer
extends Object
implements InputBuffer

Immutable default implementation of an InputBuffer.

Constructor Summary

Constructors

Constructor	Description
DefaultInputBuffer(char[] buffer)	Constructs a new DefaultInputBuffer wrapping the given char array.

Method Summary

Modifier and Type	Method	Description
char	charAt(int index)	Returns the character at the given index.
String	extract(int start, int end)	Constructs a new String from all character between the given indices.
String	extract(IndexRange range)	Constructs a new String from all character covered by the given IndexRange.
String	extractLine(int lineNumber)	Constructs a new String containing all characters with the given line number except for the trailing newline.
int	getLineCount()	Returns the number of lines in the input buffer.
int	getOriginalIndex(int index)	Translates the given index from the scope of this InputBuffer to the scope of the original, underlying char array.
Position	getPosition(int index)	Returns the line and column number of the character with the given index encapsulated in a Position object.
boolean	test(int index, char[] characters)	Determines whether the characters starting at the given index match the ones from the given array (in order).

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultInputBuffer

public DefaultInputBuffer(char[] buffer)

Constructs a new DefaultInputBuffer wrapping the given char array. CAUTION: For performance reasons the given char array is not defensively copied.

Parameters:

buffer - the chars

Method Detail

charAt

public char charAt(int index)

Description copied from interface: InputBuffer

Returns the character at the given index. If the index is invalid the method returns Chars.EOI.

Specified by:

charAt in interface InputBuffer

Parameters:

index - the index

Returns:

the character at the given index or Chars.EOI.

test

public boolean test(int index,
                    char[] characters)

Description copied from interface: InputBuffer

Determines whether the characters starting at the given index match the ones from the given array (in order).

Specified by:

test in interface InputBuffer

Parameters:

index - the index into the input buffer where to start the comparison

characters - the characters to test against the input buffer

Returns:

true if matched

extract

public String extract(int start,
                      int end)

Description copied from interface: InputBuffer

Constructs a new String from all character between the given indices. Invalid indices are automatically adjusted to their respective boundary.

Specified by:

extract in interface InputBuffer

Parameters:

start - the start index (inclusively)

end - the end index (exclusively)

Returns:

a new String (non-interned)

extract

public String extract(IndexRange range)

Description copied from interface: InputBuffer

Constructs a new String from all character covered by the given IndexRange.

Specified by:

extract in interface InputBuffer

Parameters:

range - the IndexRange

Returns:

a new String (non-interned)

getPosition

public Position getPosition(int index)

Description copied from interface: InputBuffer

Returns the line and column number of the character with the given index encapsulated in a Position object. The very first character has the line number 1 and the column number 1.

Specified by:

getPosition in interface InputBuffer

Parameters:

index - the index of the character to get the line number of

Returns:

the line number

getOriginalIndex

public int getOriginalIndex(int index)

Description copied from interface: InputBuffer

Translates the given index from the scope of this InputBuffer to the scope of the original, underlying char array. The DefaultInputBuffer implementation simply returns the given index, but other implementations like the IndentDedentInputBuffer or the MutableInputBuffer need to "undo" all compressions and index shiftings performed internally in order to return the underlying index.

Specified by:

getOriginalIndex in interface InputBuffer

Parameters:

index - the index relative to this InputBuffer

Returns:

the index relative to the underlying string or char array

extractLine

public String extractLine(int lineNumber)

Description copied from interface: InputBuffer

Constructs a new String containing all characters with the given line number except for the trailing newline.

Specified by:

extractLine in interface InputBuffer

Parameters:

lineNumber - the line number to get

Returns:

the string

getLineCount

public int getLineCount()

Description copied from interface: InputBuffer

Returns the number of lines in the input buffer.

Specified by:

getLineCount in interface InputBuffer

Returns:

number of lines in the input buffer.