mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/VisualEditor
synced 2024-11-25 14:56:20 +00:00
6652f7573b
This is for the case where we have a zero-length range in between two siblings, and we need to know what index that corresponds to in order to be able to insert nodes there (rebuildNodes() will use it for this purpose) Change-Id: I357d1cd665667a76f955a10b8d9d2810976cdbd7
327 lines
9.5 KiB
JavaScript
327 lines
9.5 KiB
JavaScript
/**
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* Generic document.
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*
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* @class
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* @constructor
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* @param model {ve.Node} Model to observe
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*/
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ve.Document = function( documentNode ) {
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// Properties
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this.documentNode = documentNode;
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};
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/* Methods */
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/**
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* Gets the root of the document's node tree.
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*
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* @method
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* @returns {ve.Node} Root of node tree
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*/
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ve.Document.prototype.getDocumentNode = function() {
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return this.documentNode;
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};
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/**
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* Gets a list of nodes and the ranges within them that a selection of the document covers.
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*
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* @method
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* @param {ve.Range} range Range within document to select nodes
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* @param {String} [mode='leaves'] Type of selection to perform
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* 'leaves': Return all leaf nodes in the given range (descends all the way down)
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* 'siblings': Return a set of adjacent siblings covered by the range (descends as long as the
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* range is in a single node)
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* @returns {Array} List of objects describing nodes in the selection and the ranges therein
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* 'node': Reference to a ve.dm.Node
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* 'range': ve.Range, missing if the entire node is covered
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* 'index': Index of the node in its parent, missing if node has no parent
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* 'indexInNode': If range is a zero-length range between two children of node,
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* this is set to the index of the child following range (or to
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* node.children.length+1 if range is between the last child and
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* the end). Missing in all other cases
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* 'nodeRange': Range covering the inside of the entire node
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* @throws 'Invalid start offset' if range.start is out of range
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* @throws 'Invalid end offset' if range.end is out of range
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*/
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ve.Document.prototype.selectNodes = function( range, mode ) {
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var doc = this.documentNode,
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retval = [],
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start = range.start,
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end = range.end,
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stack = [ {
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// Node we are currently stepping through
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// Note each iteration visits a child of node, not node itself
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'node': doc,
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// Index of the child in node we're visiting
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'index': 0,
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// First offset inside node
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'startOffset': 0
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} ],
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node,
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prevNode,
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nextNode,
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left,
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right,
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currentFrame = stack[0],
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parentFrame,
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startInside,
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endInside,
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startBetween,
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endBetween,
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startFound = false;
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mode = mode || 'leaves';
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if ( mode !== 'leaves' && mode !== 'siblings' ) {
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throw 'Invalid mode: ' + mode;
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}
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if ( start < 0 || start > doc.getLength() ) {
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throw 'Invalid start offset: ' + start;
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}
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if ( end < 0 || end > doc.getLength() ) {
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throw 'Invalid end offset: ' + end;
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}
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if ( !doc.children || doc.children.length === 0 ) {
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// Document has no children. This is weird
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return [ {
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'node': doc,
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'range': new ve.Range( start, end ),
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'index': 0,
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'nodeRange': new ve.Range( 0, doc.getLength() )
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} ];
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}
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// TODO maybe we could find the start more efficiently using the offset map
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left = doc.children[0].isWrapped() ? 1 : 0;
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while ( end >= left ) {
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node = currentFrame.node.children[currentFrame.index];
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prevNode = currentFrame.node.children[currentFrame.index - 1];
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nextNode = currentFrame.node.children[currentFrame.index + 1];
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right = left + node.getLength();
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// Is the start inside node?
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startInside = start >= left && start <= right;
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// Is the end inside node?
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endInside = end >= left && end <= right;
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// Is the start between prevNode and node or between the parent's opening and node?
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startBetween = node.isWrapped() ? start == left - 1 : start == left;
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// Is the end between node and nextNode or between node and the parent's closing?
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endBetween = node.isWrapped() ? end == right + 1 : end == right;
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if ( start == end && ( startBetween || endBetween ) && node.isWrapped() ) {
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// Empty range in the parent, outside of any child
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retval = [ {
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'node': currentFrame.node,
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'indexInNode': currentFrame.index + ( endBetween ? 1 : 0 ),
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'range': new ve.Range( start, end ),
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'nodeRange': new ve.Range( currentFrame.startOffset,
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currentFrame.startOffset + currentFrame.node.getLength()
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)
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} ];
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parentFrame = stack[stack.length - 2];
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if ( parentFrame ) {
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retval[0].index = parentFrame.index;
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}
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} else if ( startBetween ) {
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// start is between the previous sibling and node
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// so the selection covers all of node and possibly more
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if ( mode == 'leaves' && node.children && node.children.length ) {
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// Descend into node
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if ( node.children[0].isWrapped() ) {
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left++;
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}
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currentFrame = {
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'node': node,
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'index': 0,
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'startOffset': left
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};
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stack.push( currentFrame );
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startFound = true;
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continue;
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} else if ( !endInside ) {
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// All of node is covered
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retval.push( {
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'node': node,
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// no 'range' because the entire node is covered
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'index': currentFrame.index,
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'nodeRange': new ve.Range( left, right )
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} );
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startFound = true;
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} else {
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// Part of node is covered
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return [ {
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'node': node,
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'range': new ve.Range( start, end ),
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'index': currentFrame.index,
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'nodeRange': new ve.Range( left, right )
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} ];
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}
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} else if ( startInside && endInside ) {
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if ( node.children && node.children.length ) {
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// Descend into node
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// If the first child of node has an opening, skip over it
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if ( node.children[0].isWrapped() ) {
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left++;
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}
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currentFrame = {
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'node': node,
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'index': 0,
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'startOffset': left
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};
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stack.push( currentFrame );
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continue;
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} else {
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// node is a leaf node and the range is entirely inside it
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return [ {
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'node': node,
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'range': new ve.Range( start, end ),
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'index': currentFrame.index,
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'nodeRange': new ve.Range( left, right )
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} ];
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}
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} else if ( startInside ) {
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if ( mode == 'leaves' && node.children && node.children.length ) {
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// node is a branch node and the start is inside it
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// Descend into it
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if ( node.children[0].isWrapped() ) {
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left++;
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}
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currentFrame = {
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'node': node,
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'index': 0,
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'startOffset': left
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};
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stack.push( currentFrame );
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continue;
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} else {
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// node is a leaf node and the start is inside it
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// Add to retval and keep going
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retval.push( {
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'node': node,
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'range': new ve.Range( start, right ),
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'index': currentFrame.index,
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'nodeRange': new ve.Range( left, right )
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} );
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startFound = true;
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}
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} else if ( endBetween ) {
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// end is between node and the next sibling
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// start is not inside node, so the selection covers
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// all of node, then ends
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//retval.push( { 'node': node } );
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if ( mode == 'leaves' && node.children && node.children.length ) {
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// Descend into node
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if ( node.children[0].isWrapped() ) {
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left++;
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}
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currentFrame = {
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'node': node,
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'index': 0,
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'startOffset': left
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};
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stack.push( currentFrame );
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continue;
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} else {
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// All of node is covered
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retval.push( {
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'node': node,
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// no 'range' because the entire node is covered
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'index': currentFrame.index,
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'nodeRange': new ve.Range( left, right )
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} );
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return retval;
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}
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} else if ( endInside ) {
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if ( mode == 'leaves' && node.children && node.children.length ) {
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// node is a branch node and the end is inside it
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// Descend into it
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if ( node.children[0].isWrapped() ) {
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left++;
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}
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currentFrame = {
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'node': node,
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'index': 0,
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'startOffset': left
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};
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stack.push( currentFrame );
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continue;
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} else {
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// node is a leaf node and the end is inside it
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// Add to retval and return
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retval.push( {
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'node': node,
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'range': new ve.Range( left, end ),
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'index': currentFrame.index,
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'nodeRange': new ve.Range( left, right )
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} );
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return retval;
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}
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} else if ( startFound ) {
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// Neither the start nor the end is inside node, but we found the start earlier,
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// so node must be between the start and the end
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// Add the entire node, so no range property
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//retval.push( { 'node': node } );
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if ( mode == 'leaves' && node.children && node.children.length ) {
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// Descend into node
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if ( node.children[0].isWrapped() ) {
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left++;
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}
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currentFrame = {
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'node': node,
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'index': 0,
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'startOffset': left
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};
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stack.push( currentFrame );
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continue;
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} else {
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// All of node is covered
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retval.push( {
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'node': node,
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// no 'range' because the entire node is covered
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'index': currentFrame.index,
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'nodeRange': new ve.Range( left, right )
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} );
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}
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}
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// Move to the next node
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if ( nextNode ) {
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// The next node exists
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// Advance the index; the start of the next iteration will essentially
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// do node = nextNode;
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currentFrame.index++;
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// Advance to the first offset inside nextNode
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left = right +
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// Skip over node's closing, if present
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( node.isWrapped() ? 1 : 0 ) +
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// Skip over nextNode's opening, if present
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( nextNode.isWrapped() ? 1 : 0 );
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} else {
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// There is no next node, move up the stack until there is one
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left = right;
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while ( !nextNode ) {
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stack.pop();
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if ( stack.length === 0 ) {
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// This shouldn't be possible
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return retval;
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}
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currentFrame = stack[stack.length - 1];
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currentFrame.index++;
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nextNode = currentFrame.node.children[currentFrame.index];
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// Skip over the parent node's closing
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// (this is present for sure, because the parent has children)
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left++;
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}
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// Skip over nextNode's opening if present
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if ( nextNode.isWrapped() ) {
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left++;
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}
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}
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}
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return retval;
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};
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