mediawiki-extensions-Visual.../modules/ve/ve.Document.js
Trevor Parscal 8479e3d060 This should never happen, but if it does, lets make sure we know
In the past, this has cause things to break in mysterious ways

Change-Id: I2fcf1e2a9cf776a9ab9b3969d9ec552e23120e79
2012-08-08 15:17:45 -07:00

477 lines
14 KiB
JavaScript

/**
* VisualEditor Document class.
*
* @copyright 2011-2012 VisualEditor Team and others; see AUTHORS.txt
* @license The MIT License (MIT); see LICENSE.txt
*/
/**
* Generic document.
*
* @class
* @constructor
* @param model {ve.Node} Model to observe
*/
ve.Document = function ( documentNode ) {
// Properties
this.documentNode = documentNode;
};
/* Methods */
/**
* Gets the root of the document's node tree.
*
* @method
* @returns {ve.Node} Root of node tree
*/
ve.Document.prototype.getDocumentNode = function () {
return this.documentNode;
};
/**
* Gets a list of nodes and the ranges within them that a selection of the document covers.
*
* @method
* @param {ve.Range} range Range within document to select nodes
* @param {String} [mode='leaves'] Type of selection to perform
* 'leaves': Return all leaf nodes in the given range (descends all the way down)
* 'coveredNodes': Do not descend into nodes that are entirely covered by the range. The result
* is similar to that of 'leaves' except that if a node is entirely covered, its
* children aren't returned separately.
* 'siblings': Return a set of adjacent siblings covered by the range (descends as long as the
* range is in a single node)
* @returns {Array} List of objects describing nodes in the selection and the ranges therein
* 'node': Reference to a ve.dm.Node
* 'range': ve.Range, missing if the entire node is covered
* 'index': Index of the node in its parent, missing if node has no parent
* 'indexInNode': If range is a zero-length range between two children of node,
* this is set to the index of the child following range (or to
* node.children.length+1 if range is between the last child and
* the end). Missing in all other cases
* 'nodeRange': Range covering the inside of the entire node
* @throws 'Invalid start offset' if range.start is out of range
* @throws 'Invalid end offset' if range.end is out of range
*/
ve.Document.prototype.selectNodes = function ( range, mode ) {
range.normalize();
var doc = this.documentNode,
retval = [],
start = range.start,
end = range.end,
stack = [ {
// Node we are currently stepping through
// Note each iteration visits a child of node, not node itself
'node': doc,
// Index of the child in node we're visiting
'index': 0,
// First offset inside node
'startOffset': 0
} ],
node,
prevNode,
nextNode,
left,
right,
currentFrame = stack[0],
parentFrame,
startInside,
endInside,
startBetween,
endBetween,
startFound = false,
nodeRange,
isWrapped;
mode = mode || 'leaves';
if ( mode !== 'leaves' && mode !== 'covered' && mode !== 'siblings' ) {
throw new Error( 'Invalid mode: ' + mode );
}
if ( start < 0 || start > doc.getLength() ) {
throw new Error( 'Invalid start offset: ' + start );
}
if ( end < 0 || end > doc.getLength() ) {
throw new Error( 'Invalid end offset: ' + end );
}
if ( !doc.children || doc.children.length === 0 ) {
// Document has no children. This is weird
nodeRange = new ve.Range( 0, doc.getLength() );
return [ {
'node': doc,
'range': new ve.Range( start, end ),
'index': 0,
'nodeRange': nodeRange,
'nodeOuterRange': nodeRange
} ];
}
left = doc.children[0].isWrapped() ? 1 : 0;
do {
node = currentFrame.node.children[currentFrame.index];
prevNode = currentFrame.node.children[currentFrame.index - 1];
nextNode = currentFrame.node.children[currentFrame.index + 1];
right = left + node.getLength();
// Is the start inside node?
startInside = start >= left && start <= right;
// Is the end inside node?
endInside = end >= left && end <= right;
// Does the node have wrapping elements around it
isWrapped = node.isWrapped();
// Is the start between prevNode and node or between the parent's opening and node?
startBetween = isWrapped ? start === left - 1 : start === left;
// Is the end between node and nextNode or between node and the parent's closing?
endBetween = isWrapped ? end === right + 1 : end === right;
if ( isWrapped && end === left - 1 && currentFrame.index === 0 ) {
// The selection ends here with an empty range at the beginning of the node
// TODO duplicated code
nodeRange = new ve.Range( currentFrame.startOffset,
currentFrame.startOffset + currentFrame.node.getLength()
);
isWrapped = currentFrame.node.isWrapped();
retval.push( {
'node': currentFrame.node,
'indexInNode': 0,
'range': new ve.Range( end, end ),
'nodeRange': nodeRange,
'nodeOuterRange': new ve.Range(
nodeRange.start - isWrapped, nodeRange.end + isWrapped
)
} );
parentFrame = stack[stack.length - 2];
if ( parentFrame ) {
retval[retval.length - 1].index = parentFrame.index;
}
return retval;
}
if ( start === end && ( startBetween || endBetween ) && node.isWrapped() ) {
// Empty range in the parent, outside of any child
nodeRange = new ve.Range( currentFrame.startOffset,
currentFrame.startOffset + currentFrame.node.getLength()
);
isWrapped = currentFrame.node.isWrapped();
retval = [ {
'node': currentFrame.node,
'indexInNode': currentFrame.index + ( endBetween ? 1 : 0 ),
'range': new ve.Range( start, end ),
'nodeRange': nodeRange,
'nodeOuterRange': new ve.Range(
nodeRange.start - isWrapped, nodeRange.end + isWrapped
)
} ];
parentFrame = stack[stack.length - 2];
if ( parentFrame ) {
retval[0].index = parentFrame.index;
}
return retval;
} else if ( startBetween ) {
// start is between the previous sibling and node
// so the selection covers all or part of node
// Descend if
// * we are in leaves mode, OR
// * we are in covered mode and the end is inside node
if ( ( mode === 'leaves' || ( mode === 'covered' && endInside ) ) &&
node.children && node.children.length
) {
// Descend into node
currentFrame = {
'node': node,
'index': 0,
'startOffset': left
};
stack.push( currentFrame );
startFound = true;
// If the first child of node has an opening, skip over it
if ( node.children[0].isWrapped() ) {
left++;
}
continue;
} else if ( !endInside ) {
// All of node is covered
retval.push( {
'node': node,
// no 'range' because the entire node is covered
'index': currentFrame.index,
'nodeRange': new ve.Range( left, right ),
'nodeOuterRange': new ve.Range( left - isWrapped, right + isWrapped )
} );
startFound = true;
} else {
// Part of node is covered
return [ {
'node': node,
'range': new ve.Range( start, end ),
'index': currentFrame.index,
'nodeRange': new ve.Range( left, right ),
'nodeOuterRange': new ve.Range( left - isWrapped, right + isWrapped )
} ];
}
} else if ( startInside && endInside ) {
if ( node.children && node.children.length ) {
// Descend into node
currentFrame = {
'node': node,
'index': 0,
'startOffset': left
};
stack.push( currentFrame );
// If the first child of node has an opening, skip over it
if ( node.children[0].isWrapped() ) {
left++;
}
continue;
} else {
// node is a leaf node and the range is entirely inside it
return [ {
'node': node,
'range': new ve.Range( start, end ),
'index': currentFrame.index,
'nodeRange': new ve.Range( left, right ),
'nodeOuterRange': new ve.Range( left - isWrapped, right + isWrapped )
} ];
}
} else if ( startInside ) {
if (
( mode === 'leaves' || mode === 'covered' ) &&
node.children &&
node.children.length
) {
// node is a branch node and the start is inside it
// Descend into it
currentFrame = {
'node': node,
'index': 0,
'startOffset': left
};
stack.push( currentFrame );
// If the first child of node has an opening, skip over it
if ( node.children[0].isWrapped() ) {
left++;
}
continue;
} else {
// node is a leaf node and the start is inside it
// Add to retval and keep going
retval.push( {
'node': node,
'range': new ve.Range( start, right ),
'index': currentFrame.index,
'nodeRange': new ve.Range( left, right ),
'nodeOuterRange': new ve.Range( left - isWrapped, right + isWrapped )
} );
startFound = true;
}
} else if ( endBetween ) {
// end is between node and the next sibling
// start is not inside node, so the selection covers
// all of node, then ends
if ( mode === 'leaves' && node.children && node.children.length ) {
// Descend into node
currentFrame = {
'node': node,
'index': 0,
'startOffset': left
};
stack.push( currentFrame );
// If the first child of node has an opening, skip over it
if ( node.children[0].isWrapped() ) {
left++;
}
continue;
} else {
// All of node is covered
retval.push( {
'node': node,
// no 'range' because the entire node is covered
'index': currentFrame.index,
'nodeRange': new ve.Range( left, right ),
'nodeOuterRange': new ve.Range( left - isWrapped, right + isWrapped )
} );
return retval;
}
} else if ( endInside ) {
if (
( mode === 'leaves' || mode === 'covered' ) &&
node.children &&
node.children.length
) {
// node is a branch node and the end is inside it
// Descend into it
currentFrame = {
'node': node,
'index': 0,
'startOffset': left
};
stack.push( currentFrame );
// If the first child of node has an opening, skip over it
if ( node.children[0].isWrapped() ) {
left++;
}
continue;
} else {
// node is a leaf node and the end is inside it
// Add to retval and return
retval.push( {
'node': node,
'range': new ve.Range( left, end ),
'index': currentFrame.index,
'nodeRange': new ve.Range( left, right ),
'nodeOuterRange': new ve.Range( left - isWrapped, right + isWrapped )
} );
return retval;
}
} else if ( startFound && end > right ) {
// Neither the start nor the end is inside node, but we found the start earlier,
// so node must be between the start and the end
// Add the entire node, so no range property
if ( mode === 'leaves' && node.children && node.children.length ) {
// Descend into node
currentFrame = {
'node': node,
'index': 0,
'startOffset': left
};
stack.push( currentFrame );
// If the first child of node has an opening, skip over it
if ( node.children[0].isWrapped() ) {
left++;
}
continue;
} else {
// All of node is covered
retval.push( {
'node': node,
// no 'range' because the entire node is covered
'index': currentFrame.index,
'nodeRange': new ve.Range( left, right ),
'nodeOuterRange': new ve.Range( left - isWrapped, right + isWrapped )
} );
}
}
// Move to the next node
if ( nextNode ) {
// The next node exists
// Advance the index; the start of the next iteration will essentially
// do node = nextNode;
currentFrame.index++;
// Advance to the first offset inside nextNode
left = right +
// Skip over node's closing, if present
( node.isWrapped() ? 1 : 0 ) +
// Skip over nextNode's opening, if present
( nextNode.isWrapped() ? 1 : 0 );
} else {
// There is no next node, move up the stack until there is one
left = right +
// Skip over node's closing, if present
( node.isWrapped() ? 1 : 0 );
while ( !nextNode ) {
// Check if the start is right past the end of this node, at the end of
// the parent
if ( node.isWrapped() && start === left ) {
// TODO duplicated code
nodeRange = new ve.Range( currentFrame.startOffset,
currentFrame.startOffset + currentFrame.node.getLength()
);
isWrapped = currentFrame.node.isWrapped();
retval = [ {
'node': currentFrame.node,
'indexInNode': currentFrame.index + 1,
'range': new ve.Range( left, left ),
'nodeRange': nodeRange,
'nodeOuterRange': new ve.Range(
nodeRange.start - isWrapped, nodeRange.end + isWrapped
)
} ];
parentFrame = stack[stack.length - 2];
if ( parentFrame ) {
retval[0].index = parentFrame.index;
}
}
// Move up the stack
stack.pop();
if ( stack.length === 0 ) {
// This shouldn't be possible
return retval;
}
currentFrame = stack[stack.length - 1];
currentFrame.index++;
nextNode = currentFrame.node.children[currentFrame.index];
// Skip over the parent node's closing
// (this is present for sure, because the parent has children)
left++;
}
// Skip over nextNode's opening if present
if ( nextNode.isWrapped() ) {
left++;
}
}
} while ( end >= left - 1 );
if ( retval.length === 0 ) {
throw new Error( 'selectNodes epic fail' );
}
return retval;
};
/**
* Return groups of sibling nodes covered by the given range
* @param {ve.Range} selection Range
* @return {Array} Array of objects. Each object has the following keys:
* nodes: Array of sibling nodes covered by a part of range
* parent: Parent of all of these nodes
* grandparent: parent's parent
*/
ve.Document.prototype.getCoveredSiblingGroups = function ( selection ) {
var i, firstCoveredSibling, lastCoveredSibling, node, parentNode, siblingNode,
leaves = this.selectNodes( selection, 'leaves' ),
groups = [],
lastEndOffset = 0;
for ( i = 0; i < leaves.length; i++ ) {
if ( leaves[i].nodeOuterRange.end <= lastEndOffset ) {
// This range is contained within a range we've already processed
continue;
}
node = leaves[i].node;
// Traverse up to a content branch from content elements
if ( node.isContent() ) {
node = node.getParent();
}
parentNode = node.getParent();
// Group this with its covered siblings
groups.push( {
'parent': parentNode,
'grandparent': parentNode.getParent(),
'nodes': []
} );
firstCoveredSibling = node;
// Seek forward to the last covered sibling
siblingNode = firstCoveredSibling;
do {
// Add this to its sibling's group
groups[groups.length - 1].nodes.push( siblingNode );
lastCoveredSibling = siblingNode;
i++;
if ( leaves[i] === undefined ) {
break;
}
// Traverse up to a content branch from content elements
siblingNode = leaves[i].node;
if ( siblingNode.isContent() ) {
siblingNode = siblingNode.getParent();
}
} while ( siblingNode.getParent() === parentNode );
i--;
lastEndOffset = parentNode.getOuterRange().end;
}
return groups;
};