public class HTMLReader

An HTML reader to load an HTML document with an HTML element structure. This is a set of callbacks from the parser, implemented to create a set of elements tagged with attributes. The parse builds up tokens (ElementSpec) that describe the element subtree desired, and burst it into the document under the protection of a write lock using the insert method on the document outer class.

The reader can be configured by registering actions (of type HTMLDocument.HTMLReader.TagAction) that describe how to handle the action. The idea behind the actions provided is that the most natural text editing operations can be provided if the element structure boils down to paragraphs with runs of some kind of style in them. Some things are more naturally specified structurally, so arbitrary structure should be allowed above the paragraphs, but will need to be edited with structural actions. The implication of this is that some of the HTML elements specified in the stream being parsed will be collapsed into attributes, and in some cases paragraphs will be synthesized. When HTML elements have been converted to attributes, the attribute key will be of type HTML.Tag, and the value will be of type AttributeSet so that no information is lost. This enables many of the existing actions to work so that the user can type input, hit the return key, backspace, delete, etc and have a reasonable result. Selections can be created, and attributes applied or removed, etc. With this in mind, the work done by the reader can be categorized into the following kinds of tasks:

Block

Build the structure like it's specified in the stream. This produces elements that contain other elements.

Paragraph

Like block except that it's expected that the element will be used with a paragraph view so a paragraph element won't need to be synthesized.

Character

Contribute the element as an attribute that will start and stop at arbitrary text locations. This will ultimately be mixed into a run of text, with all of the currently flattened HTML character elements.

Special

Produce an embedded graphical element.

Form

Produce an element that is like the embedded graphical element, except that it also has a component model associated with it.

Hidden

Create an element that is hidden from view when the document is being viewed read-only, and visible when the document is being edited. This is useful to keep the model from losing information, and used to store things like comments and unrecognized tags.

Currently, <APPLET>, <PARAM>, <MAP>, <AREA>, <LINK>, <SCRIPT> and <STYLE> are unsupported.

The assignment of the actions described is shown in the following table for the tags defined in HTML.Tag.

HTML tags and assigned actions

Tag	Action
HTML.Tag.A	CharacterAction
HTML.Tag.ADDRESS	CharacterAction
HTML.Tag.APPLET	HiddenAction
HTML.Tag.AREA	AreaAction
HTML.Tag.B	CharacterAction
HTML.Tag.BASE	BaseAction
HTML.Tag.BASEFONT	CharacterAction
HTML.Tag.BIG	CharacterAction
HTML.Tag.BLOCKQUOTE	BlockAction
HTML.Tag.BODY	BlockAction
HTML.Tag.BR	SpecialAction
HTML.Tag.CAPTION	BlockAction
HTML.Tag.CENTER	BlockAction
HTML.Tag.CITE	CharacterAction
HTML.Tag.CODE	CharacterAction
HTML.Tag.DD	BlockAction
HTML.Tag.DFN	CharacterAction
HTML.Tag.DIR	BlockAction
HTML.Tag.DIV	BlockAction
HTML.Tag.DL	BlockAction
HTML.Tag.DT	ParagraphAction
HTML.Tag.EM	CharacterAction
HTML.Tag.FONT	CharacterAction
HTML.Tag.FORM	As of 1.4 a BlockAction
HTML.Tag.FRAME	SpecialAction
HTML.Tag.FRAMESET	BlockAction
HTML.Tag.H1	ParagraphAction
HTML.Tag.H2	ParagraphAction
HTML.Tag.H3	ParagraphAction
HTML.Tag.H4	ParagraphAction
HTML.Tag.H5	ParagraphAction
HTML.Tag.H6	ParagraphAction
HTML.Tag.HEAD	HeadAction
HTML.Tag.HR	SpecialAction
HTML.Tag.HTML	BlockAction
HTML.Tag.I	CharacterAction
HTML.Tag.IMG	SpecialAction
HTML.Tag.INPUT	FormAction
HTML.Tag.ISINDEX	IsndexAction
HTML.Tag.KBD	CharacterAction
HTML.Tag.LI	BlockAction
HTML.Tag.LINK	LinkAction
HTML.Tag.MAP	MapAction
HTML.Tag.MENU	BlockAction
HTML.Tag.META	MetaAction
HTML.Tag.NOFRAMES	BlockAction
HTML.Tag.OBJECT	SpecialAction
HTML.Tag.OL	BlockAction
HTML.Tag.OPTION	FormAction
HTML.Tag.P	ParagraphAction
HTML.Tag.PARAM	HiddenAction
HTML.Tag.PRE	PreAction
HTML.Tag.SAMP	CharacterAction
HTML.Tag.SCRIPT	HiddenAction
HTML.Tag.SELECT	FormAction
HTML.Tag.SMALL	CharacterAction
HTML.Tag.STRIKE	CharacterAction
HTML.Tag.S	CharacterAction
HTML.Tag.STRONG	CharacterAction
HTML.Tag.STYLE	StyleAction
HTML.Tag.SUB	CharacterAction
HTML.Tag.SUP	CharacterAction
HTML.Tag.TABLE	BlockAction
HTML.Tag.TD	BlockAction
HTML.Tag.TEXTAREA	FormAction
HTML.Tag.TH	BlockAction
HTML.Tag.TITLE	TitleAction
HTML.Tag.TR	BlockAction
HTML.Tag.TT	CharacterAction
HTML.Tag.U	CharacterAction
HTML.Tag.UL	BlockAction
HTML.Tag.VAR	CharacterAction

Once </html> is encountered, the Actions are no longer notified.

extends ParserCallback