mediawiki-extensions-Visual.../modules/ve/dm/ve.dm.SurfaceFragment.js
2013-02-26 00:22:01 +00:00

826 lines
24 KiB
JavaScript

/*!
* VisualEditor DataModel Fragment class.
*
* @copyright 2011-2013 VisualEditor Team and others; see AUTHORS.txt
* @license The MIT License (MIT); see LICENSE.txt
*/
/**
* DataModel surface fragment.
*
* @class
* @constructor
* @param {ve.dm.Surface} surface Target surface
* @param {ve.Range} [range] Range within target document, current selection used by default
* @param {boolean} [noAutoSelect] Update the surface's selection when making changes
*/
ve.dm.SurfaceFragment = function VeDmSurfaceFragment( surface, range, noAutoSelect ) {
// Short-circuit for missing-surface null fragment
if ( !surface ) {
return this;
}
// Properties
this.range = range && range instanceof ve.Range ? range : surface.getSelection();
// Short-circuit for invalid range null fragment
if ( !this.range ) {
return this;
}
this.surface = surface;
this.document = surface.getDocument();
this.noAutoSelect = !!noAutoSelect;
// Events
surface.on( 'transact', ve.bind( this.onTransact, this ) );
// Initialization
var length = this.document.getLength();
this.range = new ve.Range(
// Clamp range to valid document offsets
Math.min( Math.max( this.range.from, 0 ), length ),
Math.min( Math.max( this.range.to, 0 ), length )
);
};
/* Static Properties */
/**
* @static
* @property
* @inheritable
*/
ve.dm.SurfaceFragment.static = {};
/* Methods */
/**
* Handle transactions being processed on the document.
*
* This keeps the range of the fragment valid, even while other transactions are being processed.
*
* @method
* @param {ve.dm.Transaction[]} txs Transactions that have just been processed
*/
ve.dm.SurfaceFragment.prototype.onTransact = function ( txs ) {
for ( var i = 0; i < txs.length; i++ ) {
this.range = txs[i].translateRange( this.range );
}
};
/**
* Get the surface the fragment is a part of.
*
* @method
* @returns {ve.dm.Surface} Surface of fragment
*/
ve.dm.SurfaceFragment.prototype.getSurface = function () {
return this.surface;
};
/**
* Get the document of the surface the fragment is a part of.
*
* @method
* @returns {ve.dm.Document} Document of surface of fragment
*/
ve.dm.SurfaceFragment.prototype.getDocument = function () {
return this.document;
};
/**
* Get the range of the fragment within the surface.
*
* @method
* @returns {ve.Range} Surface range
*/
ve.dm.SurfaceFragment.prototype.getRange = function () {
return this.range.clone();
};
/**
* Check if the fragment is null.
*
* @method
* @returns {boolean} Fragment is a null fragment
*/
ve.dm.SurfaceFragment.prototype.isNull = function () {
return this.surface === undefined;
};
/**
* Get a new fragment with an adjusted position
*
* @method
* @param {number} [start] Adjustment for start position
* @param {number} [end] Adjustment for end position
* @returns {ve.dm.SurfaceFragment} Adjusted fragment
*/
ve.dm.SurfaceFragment.prototype.adjustRange = function ( start, end ) {
// Handle null fragment
if ( !this.surface ) {
return this;
}
return new ve.dm.SurfaceFragment(
this.surface,
new ve.Range( this.range.start + ( start || 0 ), this.range.end + ( end || 0 ) ),
this.noAutoSelect
);
};
/**
* Get a new fragment with a truncated length.
*
* @method
* @param {number} limit Maximum length of range (negative for left-side truncation)
* @returns {ve.dm.SurfaceFragment} Truncated fragment
*/
ve.dm.SurfaceFragment.prototype.truncateRange = function ( limit ) {
// Handle null fragment
if ( !this.surface ) {
return this;
}
return new ve.dm.SurfaceFragment(
this.surface,
this.range.truncate( limit ),
this.noAutoSelect
);
};
/**
* Get a new fragment with a zero-length selection at the start offset.
*
* @method
* @returns {ve.dm.SurfaceFragment} Collapsed fragment
*/
ve.dm.SurfaceFragment.prototype.collapseRange = function () {
// Handle null fragment
if ( !this.surface ) {
return this;
}
return new ve.dm.SurfaceFragment(
this.surface, new ve.Range( this.range.start ), this.noAutoSelect
);
};
/**
* Get a new fragment with a range that no longer includes leading and trailing whitespace.
*
* @method
* @returns {ve.dm.SurfaceFragment} Trimmed fragment
*/
ve.dm.SurfaceFragment.prototype.trimRange = function () {
// Handle null fragment
if ( !this.surface ) {
return this;
}
// If range is only whitespace
if ( this.document.getText( this.range ).trim().length === 0 ) {
// Collapse range
return new ve.dm.SurfaceFragment(
this.surface, new ve.Range( this.range.start ), this.noAutoSelect
);
}
return new ve.dm.SurfaceFragment(
this.surface, this.document.trimOuterSpaceFromRange( this.range ), this.noAutoSelect
);
};
/**
* Get a new fragment that covers an expanded range of the document.
*
* @method
* @param {string} [scope='parent'] Method of expansion:
* - `word`: Expands to cover the nearest word by looking for word boundary characters
* - `annotation`: Expands to cover a given annotation (argument) within the current range
* - `root`: Expands to cover the entire document
* - `siblings`: Expands to cover all sibling nodes
* - `closest`: Expands to cover the closest common ancestor node of a give type (argument)
* - `parent`: Expands to cover the closest common parent node
* @param {Mixed} [type] Parameter to use with scope method if needed
* @returns {ve.dm.SurfaceFragment} Expanded fragment
*/
ve.dm.SurfaceFragment.prototype.expandRange = function ( scope, type ) {
// Handle null fragment
if ( !this.surface ) {
return this;
}
var range, node, nodes, parent;
switch ( scope || 'parent' ) {
case 'word':
range = new ve.Range(
this.document.getNearestWordBoundary( this.range.start, -1 ),
this.document.getNearestWordBoundary( this.range.end, 1 )
);
break;
case 'annotation':
range = this.document.getAnnotatedRangeFromSelection( this.range, type );
// Adjust selection if it does not contain the annotated range
if ( this.range.start > range.start || this.range.end < range.end ) {
// Maintain range direction
if ( this.range.from > this.range.to ) {
range = range.flip();
}
} else {
// Otherwise just keep the range as is
range = this.range.clone();
}
break;
case 'root':
range = new ve.Range( 0, this.document.getData().length );
break;
case 'siblings':
// Grow range to cover all siblings
nodes = this.document.selectNodes( this.range, 'siblings' );
if ( nodes.length === 1 ) {
range = nodes[0].node.getOuterRange();
} else {
range = new ve.Range(
nodes[0].node.getOuterRange().start,
nodes[nodes.length - 1].node.getOuterRange().end
);
}
break;
case 'closest':
// Grow range to cover closest common ancestor node of given type
node = this.document.selectNodes( this.range, 'siblings' )[0].node;
parent = node.getParent();
while ( parent && parent.getType() !== type ) {
node = parent;
parent = parent.getParent();
}
if ( !parent ) {
return new ve.dm.SurfaceFragment( null );
}
range = parent.getOuterRange();
break;
case 'parent':
// Grow range to cover the closest common parent node
node = this.document.selectNodes( this.range, 'siblings' )[0].node;
parent = node.getParent();
if ( !parent ) {
return new ve.dm.SurfaceFragment( null );
}
range = parent.getOuterRange();
break;
default:
throw new Error( 'Invalid scope argument: ' + scope );
}
return new ve.dm.SurfaceFragment( this.surface, range, this.noAutoSelect );
};
/**
* Check if the surface's selection will be updated automatically when changes are made.
*
* @method
* @returns {boolean} Will automatically update surface selection
*/
ve.dm.SurfaceFragment.prototype.willAutoSelect = function () {
return !this.noAutoSelect;
};
/**
* Get data for the fragment.
*
* @method
* @param {boolean} [deep] Get a deep copy of the data
* @returns {Array} Fragment data
*/
ve.dm.SurfaceFragment.prototype.getData = function ( deep ) {
// Handle null fragment
if ( !this.surface ) {
return [];
}
return this.document.getData( this.range, deep );
};
/**
* Get plain text for the fragment.
*
* @method
* @returns {Array} Fragment text
*/
ve.dm.SurfaceFragment.prototype.getText = function () {
// Handle null fragment
if ( !this.surface ) {
return '';
}
var i, length,
text = '',
data = this.document.getData( this.range );
for ( i = 0, length = data.length; i < length; i++ ) {
if ( data[i].type === undefined ) {
// Annotated characters have a string at index 0, plain characters are 1-char strings
text += typeof data[i] === 'string' ? data[i] : data[i][0];
}
}
return text;
};
/**
* Get annotations in fragment.
*
* By default, this will only get annotations that completely cover the fragment. Use the {all}
* argument to get all annotations that occur within the fragment.
*
* @method
* @param {boolean} [all] Get annotations cover some of the fragment
* @returns {ve.AnnotationSet} All annotation objects range is covered by
*/
ve.dm.SurfaceFragment.prototype.getAnnotations = function ( all ) {
// Handle null fragment
if ( !this.surface ) {
return new ve.AnnotationSet();
}
if ( this.range.getLength() ) {
return this.document.getAnnotationsFromRange( this.range, all );
} else {
return this.surface.getInsertionAnnotations();
}
};
/**
* Get all leaf nodes covered by the fragment.
*
* @see ve.Document#selectNodes Used to get the return value.
*
* @method
* @returns {Array} List of nodes and related information
*/
ve.dm.SurfaceFragment.prototype.getLeafNodes = function () {
// Handle null fragment
if ( !this.surface ) {
return [];
}
return this.document.selectNodes( this.range, 'leaves' );
};
/**
* Get nodes covered by the fragment.
*
* Does not descend into nodes that are entirely covered by the range. The result is
* similar to that of {ve.dm.SurfaceFragment.prototype.getLeafNodes} except that if a node is
* entirely covered, its children aren't returned separately.
*
* @see ve.Document#selectNodes for more information about the return value.
*
* @method
* @returns {Array} List of nodes and related information
*/
ve.dm.SurfaceFragment.prototype.getCoveredNodes = function () {
// Handle null fragment
if ( !this.surface ) {
return [];
}
return this.document.selectNodes( this.range, 'coveredNodes' );
};
/**
* Get nodes covered by the fragment.
*
* Includes adjacent siblings covered by the range, descending if the range is in a single node.
*
* @see ve.Document#selectNodes for more information about the return value.
*
* @method
* @returns {Array} List of nodes and related information
*/
ve.dm.SurfaceFragment.prototype.getSiblingNodes = function () {
// Handle null fragment
if ( !this.surface ) {
return [];
}
return this.document.selectNodes( this.range, 'siblings' );
};
/**
* Change whether to automatically update the surface selection when making changes.
*
* @method
* @param {boolean} [value=true] Automatically update surface selection
* @chainable
*/
ve.dm.SurfaceFragment.prototype.setAutoSelect = function ( value ) {
this.noAutoSelect = !value;
return this;
};
/**
* Apply the fragment's range to the surface as a selection.
*
* @method
* @chainable
*/
ve.dm.SurfaceFragment.prototype.select = function () {
// Handle null fragment
if ( !this.surface ) {
return this;
}
this.surface.change( null, this.range );
return this;
};
/**
* Apply an annotation to content in the fragment.
*
* To avoid problems identified in bug 33108, use the {ve.dm.SurfaceFragment.trimRange} method.
*
* TODO: Optionally take an annotation set instead of name and data arguments and set/clear multiple
* annotations in a single transaction.
*
* @method
* @param {string} method Mode of annotation, either 'set' or 'clear'
* @param {string|ve.dm.Annotation} name Annotation name, for example: 'textStyle/bold' or
* Annotation object
* @param {Object} [data] Additional annotation data (not used if annotation object is given)
* @chainable
*/
ve.dm.SurfaceFragment.prototype.annotateContent = function ( method, name, data ) {
// Handle null fragment
if ( !this.surface ) {
return this;
}
// Extract annotation information
if ( name instanceof ve.dm.Annotation ) {
data = name.data;
name = name.name;
}
var tx,
annotation = ve.dm.annotationFactory.create( name, data );
if ( this.range.getLength() ) {
// Apply to selection
tx = ve.dm.Transaction.newFromAnnotation( this.document, this.range, method, annotation );
this.surface.change( tx, !this.noAutoSelect && tx.translateRange( this.range ) );
} else {
// Apply annotation to stack
if ( method === 'set' ) {
this.surface.addInsertionAnnotation( annotation );
} else if ( method === 'clear' ) {
this.surface.removeInsertionAnnotation( annotation );
}
}
return this;
};
/**
* Remove content in the fragment and insert content before it.
*
* This will move the fragment's range to the end of the insertion and make it zero-length.
*
* @method
* @param {string|Array} content Content to insert, can be either a string or array of data
* @param {boolean} annotate Content should be automatically annotated to match surrounding content
* @chainable
*/
ve.dm.SurfaceFragment.prototype.insertContent = function ( content, annotate ) {
// Handle null fragment
if ( !this.surface ) {
return this;
}
var tx, annotations;
if ( this.range.getLength() ) {
this.removeContent();
}
// Auto-convert content to array of plain text characters
if ( typeof content === 'string' ) {
content = content.split( '' );
}
if ( content.length ) {
if ( annotate ) {
annotations = this.document.getAnnotationsFromOffset( this.range.start - 1 );
if ( annotations.getLength() > 0 ) {
ve.dm.Document.addAnnotationsToData( content, annotations );
}
}
tx = ve.dm.Transaction.newFromInsertion( this.document, this.range.start, content );
this.surface.change( tx, !this.noAutoSelect && tx.translateRange( this.range ) );
}
return this;
};
/**
* Remove content in the fragment.
*
* @method
* @chainable
*/
ve.dm.SurfaceFragment.prototype.removeContent = function () {
// Handle null fragment
if ( !this.surface ) {
return this;
}
var tx;
if ( this.range.getLength() ) {
tx = ve.dm.Transaction.newFromRemoval( this.document, this.range );
// this.range will be translated via the onTransact event handler
this.surface.change( tx, !this.noAutoSelect && tx.translateRange( this.range ) );
// Check if the range didn't get collapsed automatically - this will occur when removing
// content across un-mergable nodes because the delete only strips out content leaving
// structure at the beginning and end of the range in place
if ( this.range.getLength() ) {
// Collapse the range manually
this.range = new ve.Range( this.range.start );
if ( !this.noAutoSelect ) {
// Update the surface selection
this.surface.change( null, this.range );
}
}
}
return this;
};
/**
* Convert each content branch in the fragment from one type to another.
*
* @method
* @param {string} type Element type to convert to
* @param {Object} [attr] Initial attributes for new element
* @chainable
*/
ve.dm.SurfaceFragment.prototype.convertNodes = function ( type, attr ) {
// Handle null fragment
if ( !this.surface ) {
return this;
}
var tx =
ve.dm.Transaction.newFromContentBranchConversion( this.document, this.range, type, attr );
this.surface.change( tx, !this.noAutoSelect && tx.translateRange( this.range ) );
return this;
};
/**
* Wrap each node in the fragment with one or more elements.
*
* A wrapper object is a linear model element; a plain object containing a type property and an
* optional attributes property.
*
* Example:
* // fragment is a selection of: <p>a</p><p>b</p>
* fragment.wrapNodes(
* [{ 'type': 'list', 'attributes': { 'style': 'bullet' } }, { 'type': 'listItem' }]
* )
* // fragment is now a selection of: <ul><li><p>a</p></li></ul><ul><li><p>b</p></li></ul>
*
* @method
* @param {Object|Object[]} wrapper Wrapper object, or array of wrapper objects (see above)
* @param {string} wrapper.type Node type of wrapper
* @param {Object} [wrapper.attributes] Attributes of wrapper
* @chainable
*/
ve.dm.SurfaceFragment.prototype.wrapNodes = function ( wrapper ) {
// Handle null fragment
if ( !this.surface ) {
return this;
}
if ( !ve.isArray( wrapper ) ) {
wrapper = [wrapper];
}
var tx = ve.dm.Transaction.newFromWrap( this.document, this.range, [], [], [], wrapper );
this.range = tx.translateRange( this.range );
this.surface.change( tx, !this.noAutoSelect && this.range );
return this;
};
/**
* Unwrap each node in the fragment out of one or more elements.
*
* @method
* @param {string|string[]} type Node types to unwrap, or array of node types to unwrap
* @chainable
*/
ve.dm.SurfaceFragment.prototype.unwrapNodes = function () {
// Handle null fragment
if ( !this.surface ) {
return this;
}
// TODO: Implement
return this;
};
/**
* Change the wrapping of each node in the fragment from one type to another.
*
* A wrapper object is a linear model element; a plain object containing a type property and an
* optional attributes property.
*
* @method
* @param {string|string[]} type Node types to unwrap, or array of node types to unwrap
* @param {Object|Object[]} wrapper Wrapper object, or array of wrapper objects (see above)
* @param {string} wrapper.type Node type of wrapper
* @param {Object} [wrapper.attributes] Attributes of wrapper
* @chainable
*/
ve.dm.SurfaceFragment.prototype.rewrapNodes = function () {
// Handle null fragment
if ( !this.surface ) {
return this;
}
// TODO: Implement
return this;
};
/**
* Wrap nodes in the fragment with one or more elements.
*
* A wrapper object is a linear model element; a plain object containing a type property and an
* optional attributes property.
*
* Example:
* // fragment is a selection of: <p>a</p><p>b</p>
* fragment.wrapAllNodes(
* [{ 'type': 'list', 'attributes': { 'style': 'bullet' } }, { 'type': 'listItem' }]
* )
* // fragment is now a selection of: <ul><li><p>a</p><p>b</p></li></ul>
*
* @method
* @param {Object|Object[]} wrapper Wrapper object, or array of wrapper objects (see above)
* @param {string} wrapper.type Node type of wrapper
* @param {Object} [wrapper.attributes] Attributes of wrapper
* @chainable
*/
ve.dm.SurfaceFragment.prototype.wrapAllNodes = function ( wrapper ) {
// Handle null fragment
if ( !this.surface ) {
return this;
}
var tx, newRange;
if ( !ve.isArray( wrapper ) ) {
wrapper = [wrapper];
}
newRange = new ve.Range( this.range.start, this.range.end + ( wrapper.length * 2 ) );
tx = ve.dm.Transaction.newFromWrap( this.document, this.range, [], wrapper, [], [] );
this.surface.change( tx, !this.noAutoSelect && newRange );
this.range = newRange;
return this;
};
/**
* Unwrap nodes in the fragment out of one or more elements.
*
* Unwrap only removes elements from inside the fragment.
*
* Example:
* // fragment is a selection of: <ul><li><p>text</p></li></ul>
* fragment.unwrapAllNodes( 2 );
* // fragment is now a selection of: <p>text</p>
*
* @method
* @param {number} depth Number of nodes to unwrap
* @chainable
*/
ve.dm.SurfaceFragment.prototype.unwrapAllNodes = function ( depth ) {
// Handle null fragment
if ( !this.surface ) {
return this;
}
var i, tx, newRange, unwrapper = [],
innerRange = new ve.Range( this.range.start + depth, this.range.end - depth );
if ( this.range.end - this.range.start < depth * 2 ) {
throw new Error( 'cannot unwrap by greater depth than maximum theoretical depth of selection' );
}
for ( i = 0; i < depth; i++ ) {
unwrapper.push( this.surface.getDocument().data[this.range.start + i] );
}
newRange = new ve.Range( this.range.start, this.range.end - ( depth * 2 ) );
tx = ve.dm.Transaction.newFromWrap( this.document, innerRange, unwrapper, [], [], [] );
this.surface.change( tx, !this.noAutoSelect && newRange );
this.range = newRange;
return this;
};
/**
* Change the wrapping of nodes in the fragment from one type to another.
*
* A wrapper object is a linear model element; a plain object containing a type property and an
* optional attributes property.
*
* @method
* @param {string|string[]} type Node types to unwrap, or array of node types to unwrap
* @param {Object|Object[]} wrapper Wrapper object, or array of wrapper objects (see above)
* @param {string} wrapper.type Node type of wrapper
* @param {Object} [wrapper.attributes] Attributes of wrapper
* @chainable
*/
ve.dm.SurfaceFragment.prototype.rewrapAllNodes = function ( depth, wrapper ) {
// Handle null fragment
if ( !this.surface ) {
return this;
}
var i, tx, newRange, unwrapper = [],
depthChange = wrapper.length - depth,
innerRange = new ve.Range( this.range.start + depth, this.range.end - depth );
if ( this.range.end - this.range.start < depth * 2 ) {
throw new Error( 'cannot unwrap by greater depth than maximum theoretical depth of selection' );
}
for ( i = 0; i < depth; i++ ) {
unwrapper.push( this.surface.getDocument().data[this.range.start + i] );
}
newRange = new ve.Range( this.range.start, this.range.end + ( depthChange * 2 ) );
tx = ve.dm.Transaction.newFromWrap( this.document, innerRange, unwrapper, wrapper, [], [] );
this.surface.change( tx, !this.noAutoSelect && newRange );
this.range = newRange;
return this;
};
/**
* Isolates the nodes in a fragment.
*
* The node selection is expanded to siblings and then these are isolated such that they are the
* sole children of a parent element which can be placed anywhere.
*
* @method
* @chainable
*/
ve.dm.SurfaceFragment.prototype.isolate = function () {
// Handle null fragment
if ( !this.surface ) {
return this;
}
var nodes, startSplitNode, endSplitNode, tx,
startOffset, endOffset,
startSplitRequired = false,
endSplitRequired = false,
startSplitNodes = [],
endSplitNodes = [],
fragment = this;
function createSplits( splitNodes, insertBefore ) {
var i, length,
startOffsetChange = 0, endOffsetChange = 0, data = [];
for ( i = 0, length = splitNodes.length; i < length; i++ ) {
data.unshift( { 'type': '/' + splitNodes[i].type } );
data.push( splitNodes[i].getClonedElement() );
if ( insertBefore ) {
startOffsetChange += 2;
endOffsetChange += 2;
}
}
tx = ve.dm.Transaction.newFromInsertion( fragment.document, insertBefore ? startOffset : endOffset, data );
fragment.surface.change( tx, !fragment.noAutoSelect && tx.translateRange( fragment.range ) );
startOffset += startOffsetChange;
endOffset += endOffsetChange;
}
nodes = this.document.selectNodes( this.range, 'siblings' );
// Find start split point, if required
startSplitNode = nodes[0].node;
startOffset = startSplitNode.getOuterRange().start;
while ( startSplitNode.constructor.static.parentNodeTypes !== null ) {
if ( startSplitNode.parent.indexOf( startSplitNode ) > 0 ) {
startSplitRequired = true;
}
startSplitNode = startSplitNode.parent;
if ( startSplitRequired ) {
startSplitNodes.unshift(startSplitNode);
} else {
startOffset = startSplitNode.getOuterRange().start;
}
}
// Find end split point, if required
endSplitNode = nodes[nodes.length - 1].node;
endOffset = endSplitNode.getOuterRange().end;
while ( endSplitNode.constructor.static.parentNodeTypes !== null ) {
if ( endSplitNode.parent.indexOf( endSplitNode ) < endSplitNode.parent.getChildren().length - 1 ) {
endSplitRequired = true;
}
endSplitNode = endSplitNode.parent;
if ( endSplitRequired ) {
endSplitNodes.unshift(endSplitNode);
} else {
endOffset = endSplitNode.getOuterRange().end;
}
}
if ( startSplitRequired ) {
createSplits( startSplitNodes, true );
}
if ( endSplitRequired ) {
createSplits( endSplitNodes, false );
}
return this;
};