Class: Chunk (private in Diff2

• Inheritance
• Description
• Class protocol
  • as yet unclassified
• Instance protocol
  • accessing
  • as yet unclassified
  • comparing

Inheritance:

   Object
   |
   +--Diff2::Chunk

Package:

stx:libtool

Category:

Collections-Sequenceable-Diff

Owner:

Diff2

Description:

A DiffChunk represents a span of items within a collection (e.g. a collection of lines representing a text file).

Instance Variables
    length:                 <Integer> Count of lines within the chunk; 0 is permitted
    offset:                 <Integer> Index of first line within the chunk; 1-based


[instance variables:]

[class variables:]

copyright
Copyright (c) 2007-2012 Tony Garnock-Jones

This code is based on Squeak's DiffMerge package
written by Tony Garnock-Jones. Original project's web site:

http://www.squeaksource.com/DiffMerge

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the 'Software'), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

Class protocol:

 negativeSize: s

Returns a pseudo-chunk with *negative* length, useful as a kind of zero for destructiveMergeWith: operations intended to build up coverage over some set of chunks.

 offset: o length: l

Instance protocol:

 correctForSkewFrom: smallerChunk to: biggerChunk

Given a biggerChunk that definitely contains smallerChunk but might have an extra head or tail, updates the receiver to include such an extra head or tail.

 destructiveMergeWith: aChunk

 lastIndex

Returns the rightmost index contained in my range. (Offset is the leftmost index.) If my length is zero, will return an index lower than my offset.

 length

 length: anObject

 offset

 offset: anObject

 printOn: aStream

(comment from inherited method)
append a user printed representation of the receiver to aStream.
The format is suitable for a human - not meant to be read back.

The default here is to output the receiver's class name.
BUT: this method is heavily redefined for objects which
can print prettier.

 extractFrom: aCollection

Extracts a subcollection from aCollection corresponding to my offset and length.

 extractSafeFrom: aCollection

Extracts a subcollection from aCollection corresponding to my offset and length.
Returns nil if extraction fails (out of bounds)

 < aDiffChunk

Used to sort changed chunks during three-way merge; see Diff3

 = otherChunk

(comment from inherited method)
return true if the receiver and the arg have the same structure.
Notice:
This method is partially open coded (inlined) by the compiler(s)
identical objects are always considered equal.
redefining it may not work as expected.