My instances provide an external file reference to a piece of text. It may be the sourceCode of a method, or the class comments of a class.

The changes file or file-in file usually has a chunk that is just the source string of a method:

max: aNumber
^ self > aNumber ifTrue: [self] ifFalse: [aNumber]!

I can return either a String or a Text. Some a chunk is followed by a second chunk (beginning with ]style[) containing style information. The encoding is like this:

max: aNumber
^ self > aNumber ifTrue: [self] ifFalse: [aNumber]!
]style[(14 50 312)f1,f1b,f1LInteger +;i!

Allowed TextAttributes are TextFontChange, TextEmphasis, TextColor, TextDoIt, TextKern, TextLink, TextURL. TextFontReference and TextAnchor are not supported.

See PositionableStream nextChunkText and RunArray class scanFrom:.

	private
	checkSum: fileNumber:position: makeNewTextAttVersion string:onFileNumber: string:onFileNumber:toFile:

	accessing	top
	position Answer the location of the string on a file.
	setSourcePointer:
	sourceFileNumber Answer the index of the file on which the string is stored.
	sourcePointer
	string Answer the receiver's string if remote files are enabled.
	text Answer the receiver's string asText if remote files are enabled.

	private	top
	checkSum: Construct a checksum of the string. A three byte number represented as Base64 characters.
	fileNumber:position:
	makeNewTextAttVersion Create a new TextAttributes version because some inst var has changed. If no change, don't make a new one.
	string:onFileNumber: Store this as my string if source files exist.
	string:onFileNumber:toFile: Store this as the receiver's text if source files exist. If aStringOrText is a Text, store a marker with the string part, and then store the runs of TextAttributes in the next chunk.

	as yet unclassified	top
	currentTextAttVersion The current configuration of the TextAttributes classes has a structures array describing the inst vars of the classes (SmartRefStream instVarInfo:). Return tag that indexes the TextAttributeStructureVersions dictionary (4 random characters).
	initialize Derive the current TextAttributes classes object structure
	newFileNumber:position: Answer an instance of me fora file indexed by sourceIndex, at the position anInteger. Assume that the string is already stored on the file and the instance will be used to access it.
	newString:onFileNumber: Answer an instance of me for string, aString, on file indexed by sourceIndex. Put the string on the file and create the remote reference.
	newString:onFileNumber:toFile: Answer an instance of me for string, aString, on file indexed by sourceIndex. Put the string on the file, aFileStream, and create the remote reference. Assume that the index corresponds properly to aFileStream.
	structureAt: