org.parboiled.buffers

Interface InputBuffer

All Known Implementing Classes:

DefaultInputBuffer, IndentDedentInputBuffer, MutableInputBuffer

public interface InputBuffer

Abstraction of a simple char[] buffer holding the input text to be parsed.

Method Summary

Methods

Modifier and Type	Method and Description
char	charAt(int index) Returns the character at the given index.
java.lang.String	extract(IndexRange range) Constructs a new String from all character covered by the given IndexRange.
java.lang.String	extract(int start, int end) Constructs a new String from all character between the given indices.
java.lang.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).

Method Detail

charAt

char charAt(int index)

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

Parameters:

index - the index

Returns:

the character at the given index or Chars.EOI.

test

boolean test(int index,
           char[] characters)

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

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

java.lang.String extract(int start,
                       int end)

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

Parameters:

start - the start index (inclusively)

end - the end index (exclusively)

Returns:

a new String (non-interned)

extract

java.lang.String extract(IndexRange range)

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

Parameters:

range - the IndexRange

Returns:

a new String (non-interned)

getPosition

Position getPosition(int index)

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.

Parameters:

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

Returns:

the line number

getOriginalIndex

int getOriginalIndex(int index)

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.

Parameters:

index - the index relative to this InputBuffer

Returns:

the index relative to the underlying string or char array

extractLine

java.lang.String extractLine(int lineNumber)

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

Parameters:

lineNumber - the line number to get

Returns:

the string

getLineCount

int getLineCount()

Returns the number of lines in the input buffer.

Returns:

number of lines in the input buffer.