mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/VisualEditor
synced 2024-11-29 16:44:51 +00:00
358 lines
11 KiB
JavaScript
358 lines
11 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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* 'coveredNodes': Do not descend into nodes that are entirely covered by the range. The result
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* is similar to that of 'leaves' except that if a node is entirely covered, its
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* children aren't returned separately.
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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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range.normalize();
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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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nodeRange,
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isWrapped;
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mode = mode || 'leaves';
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if ( mode !== 'leaves' && mode !== 'covered' && 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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nodeRange = new ve.Range( 0, doc.getLength() );
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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': nodeRange,
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'nodeOuterRange': nodeRange
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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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do {
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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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// Does the node have wrapping elements around it
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isWrapped = node.isWrapped();
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// Is the start between prevNode and node or between the parent's opening and node?
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startBetween = 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 = 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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nodeRange = new ve.Range( currentFrame.startOffset,
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currentFrame.startOffset + currentFrame.node.getLength()
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);
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isWrapped = currentFrame.node.isWrapped();
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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': nodeRange,
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'nodeOuterRange': new ve.Range(
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nodeRange.start - isWrapped, nodeRange.end + isWrapped
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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 or part of node
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// Descend if
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// * we are in leaves mode, OR
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// * we are in covered mode and the end is inside node
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if ( ( mode === 'leaves' || ( mode === 'covered' && endInside ) ) &&
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node.children && node.children.length
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) {
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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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'nodeOuterRange': new ve.Range( left - isWrapped, right + isWrapped )
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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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'nodeOuterRange': new ve.Range( left - isWrapped, right + isWrapped )
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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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'nodeOuterRange': new ve.Range( left - isWrapped, right + isWrapped )
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} ];
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}
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} else if ( startInside ) {
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if ( ( mode === 'leaves' || mode === 'covered' )
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&& node.children && node.children.length
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) {
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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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'nodeOuterRange': new ve.Range( left - isWrapped, right + isWrapped )
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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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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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'nodeOuterRange': new ve.Range( left - isWrapped, right + isWrapped )
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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' || mode === 'covered' )
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&& node.children && node.children.length
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) {
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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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'nodeOuterRange': new ve.Range( left - isWrapped, right + isWrapped )
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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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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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'nodeOuterRange': new ve.Range( left - isWrapped, right + isWrapped )
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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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// Skip over node's closing, if present
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( node.isWrapped() ? 1 : 0 );
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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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} while ( end >= left );
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return retval;
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};
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