mirror of
https://github.com/fastmail/Squire.git
synced 2024-12-22 15:23:29 -05:00
493 lines
16 KiB
JavaScript
493 lines
16 KiB
JavaScript
/*jshint strict:false, undef:false, unused:false */
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var getNodeBefore = function ( node, offset ) {
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var children = node.childNodes;
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while ( offset && node.nodeType === ELEMENT_NODE ) {
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node = children[ offset - 1 ];
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children = node.childNodes;
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offset = children.length;
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}
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return node;
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};
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var getNodeAfter = function ( node, offset ) {
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if ( node.nodeType === ELEMENT_NODE ) {
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var children = node.childNodes;
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if ( offset < children.length ) {
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node = children[ offset ];
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} else {
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while ( node && !node.nextSibling ) {
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node = node.parentNode;
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}
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if ( node ) { node = node.nextSibling; }
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}
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}
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return node;
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};
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// ---
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var forEachTextNodeInRange = function ( range, fn ) {
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range = range.cloneRange();
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moveRangeBoundariesDownTree( range );
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var startContainer = range.startContainer,
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endContainer = range.endContainer,
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root = range.commonAncestorContainer,
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walker = new TreeWalker(
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root, SHOW_TEXT, function (/* node */) {
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return true;
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}, false ),
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textnode = walker.currentNode = startContainer;
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while ( !fn( textnode, range ) &&
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textnode !== endContainer &&
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( textnode = walker.nextNode() ) ) {}
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};
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var getTextContentInRange = function ( range ) {
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var textContent = '';
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forEachTextNodeInRange( range, function ( textnode, range ) {
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var value = textnode.data;
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if ( value && ( /\S/.test( value ) ) ) {
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if ( textnode === range.endContainer ) {
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value = value.slice( 0, range.endOffset );
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}
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if ( textnode === range.startContainer ) {
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value = value.slice( range.startOffset );
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}
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textContent += value;
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}
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});
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return textContent;
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};
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// ---
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var insertNodeInRange = function ( range, node ) {
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// Insert at start.
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var startContainer = range.startContainer,
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startOffset = range.startOffset,
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endContainer = range.endContainer,
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endOffset = range.endOffset,
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parent, children, childCount, afterSplit;
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// If part way through a text node, split it.
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if ( startContainer.nodeType === TEXT_NODE ) {
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parent = startContainer.parentNode;
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children = parent.childNodes;
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if ( startOffset === startContainer.length ) {
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startOffset = indexOf.call( children, startContainer ) + 1;
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if ( range.collapsed ) {
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endContainer = parent;
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endOffset = startOffset;
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}
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} else {
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if ( startOffset ) {
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afterSplit = startContainer.splitText( startOffset );
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if ( endContainer === startContainer ) {
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endOffset -= startOffset;
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endContainer = afterSplit;
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}
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else if ( endContainer === parent ) {
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endOffset += 1;
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}
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startContainer = afterSplit;
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}
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startOffset = indexOf.call( children, startContainer );
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}
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startContainer = parent;
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} else {
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children = startContainer.childNodes;
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}
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childCount = children.length;
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if ( startOffset === childCount) {
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startContainer.appendChild( node );
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} else {
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startContainer.insertBefore( node, children[ startOffset ] );
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}
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if ( startContainer === endContainer ) {
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endOffset += children.length - childCount;
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}
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range.setStart( startContainer, startOffset );
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range.setEnd( endContainer, endOffset );
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};
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var extractContentsOfRange = function ( range, common ) {
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var startContainer = range.startContainer,
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startOffset = range.startOffset,
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endContainer = range.endContainer,
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endOffset = range.endOffset;
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if ( !common ) {
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common = range.commonAncestorContainer;
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}
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if ( common.nodeType === TEXT_NODE ) {
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common = common.parentNode;
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}
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var endNode = split( endContainer, endOffset, common ),
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startNode = split( startContainer, startOffset, common ),
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frag = common.ownerDocument.createDocumentFragment(),
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next;
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// End node will be null if at end of child nodes list.
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while ( startNode !== endNode ) {
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next = startNode.nextSibling;
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frag.appendChild( startNode );
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startNode = next;
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}
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range.setStart( common, endNode ?
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indexOf.call( common.childNodes, endNode ) :
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common.childNodes.length );
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range.collapse( true );
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fixCursor( common );
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return frag;
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};
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var deleteContentsOfRange = function ( range ) {
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// Move boundaries up as much as possible to reduce need to split.
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moveRangeBoundariesUpTree( range );
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// Remove selected range
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extractContentsOfRange( range );
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// If we split into two different blocks, merge the blocks.
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var startBlock = getStartBlockOfRange( range ),
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endBlock = getEndBlockOfRange( range );
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if ( startBlock && endBlock && startBlock !== endBlock ) {
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mergeWithBlock( startBlock, endBlock, range );
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}
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// Ensure block has necessary children
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if ( startBlock ) {
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fixCursor( startBlock );
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}
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// Ensure body has a block-level element in it.
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var body = range.endContainer.ownerDocument.body,
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child = body.firstChild;
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if ( !child || child.nodeName === 'BR' ) {
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fixCursor( body );
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range.selectNodeContents( body.firstChild );
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}
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// Ensure valid range (must have only block or inline containers)
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var isCollapsed = range.collapsed;
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moveRangeBoundariesDownTree( range );
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if ( isCollapsed ) {
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// Collapse
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range.collapse( true );
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}
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};
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// ---
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var insertTreeFragmentIntoRange = function ( range, frag ) {
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// Check if it's all inline content
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var allInline = true,
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children = frag.childNodes,
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l = children.length;
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while ( l-- ) {
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if ( !isInline( children[l] ) ) {
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allInline = false;
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break;
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}
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}
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// Delete any selected content
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if ( !range.collapsed ) {
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deleteContentsOfRange( range );
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}
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// Move range down into text ndoes
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moveRangeBoundariesDownTree( range );
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// If inline, just insert at the current position.
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if ( allInline ) {
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insertNodeInRange( range, frag );
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range.collapse( false );
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}
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// Otherwise, split up to body, insert inline before and after split
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// and insert block in between split, then merge containers.
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else {
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var nodeAfterSplit = split( range.startContainer, range.startOffset,
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range.startContainer.ownerDocument.body ),
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nodeBeforeSplit = nodeAfterSplit.previousSibling,
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startContainer = nodeBeforeSplit,
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startOffset = startContainer.childNodes.length,
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endContainer = nodeAfterSplit,
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endOffset = 0,
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parent = nodeAfterSplit.parentNode,
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child, node;
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while ( ( child = startContainer.lastChild ) &&
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child.nodeType === ELEMENT_NODE &&
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child.nodeName !== 'BR' ) {
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startContainer = child;
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startOffset = startContainer.childNodes.length;
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}
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while ( ( child = endContainer.firstChild ) &&
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child.nodeType === ELEMENT_NODE &&
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child.nodeName !== 'BR' ) {
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endContainer = child;
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}
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while ( ( child = frag.firstChild ) && isInline( child ) ) {
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startContainer.appendChild( child );
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}
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while ( ( child = frag.lastChild ) && isInline( child ) ) {
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endContainer.insertBefore( child, endContainer.firstChild );
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endOffset += 1;
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}
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// Fix cursor then insert block(s)
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node = frag;
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while ( node = getNextBlock( node ) ) {
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fixCursor( node );
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}
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parent.insertBefore( frag, nodeAfterSplit );
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// Remove empty nodes created by split and merge inserted containers
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// with edges of split
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node = nodeAfterSplit.previousSibling;
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if ( !nodeAfterSplit.textContent ) {
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parent.removeChild( nodeAfterSplit );
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} else {
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mergeContainers( nodeAfterSplit );
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}
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if ( !nodeAfterSplit.parentNode ) {
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endContainer = node;
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endOffset = getLength( endContainer );
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}
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if ( !nodeBeforeSplit.textContent) {
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startContainer = nodeBeforeSplit.nextSibling;
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startOffset = 0;
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parent.removeChild( nodeBeforeSplit );
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} else {
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mergeContainers( nodeBeforeSplit );
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}
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range.setStart( startContainer, startOffset );
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range.setEnd( endContainer, endOffset );
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moveRangeBoundariesDownTree( range );
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}
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};
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// ---
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var isNodeContainedInRange = function ( range, node, partial ) {
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var nodeRange = node.ownerDocument.createRange();
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nodeRange.selectNode( node );
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if ( partial ) {
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// Node must not finish before range starts or start after range
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// finishes.
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var nodeEndBeforeStart = ( range.compareBoundaryPoints(
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END_TO_START, nodeRange ) > -1 ),
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nodeStartAfterEnd = ( range.compareBoundaryPoints(
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START_TO_END, nodeRange ) < 1 );
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return ( !nodeEndBeforeStart && !nodeStartAfterEnd );
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}
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else {
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// Node must start after range starts and finish before range
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// finishes
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var nodeStartAfterStart = ( range.compareBoundaryPoints(
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START_TO_START, nodeRange ) < 1 ),
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nodeEndBeforeEnd = ( range.compareBoundaryPoints(
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END_TO_END, nodeRange ) > -1 );
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return ( nodeStartAfterStart && nodeEndBeforeEnd );
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}
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};
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var moveRangeBoundariesDownTree = function ( range ) {
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var startContainer = range.startContainer,
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startOffset = range.startOffset,
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endContainer = range.endContainer,
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endOffset = range.endOffset,
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child;
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while ( startContainer.nodeType !== TEXT_NODE ) {
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child = startContainer.childNodes[ startOffset ];
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if ( !child || isLeaf( child ) ) {
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break;
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}
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startContainer = child;
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startOffset = 0;
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}
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if ( endOffset ) {
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while ( endContainer.nodeType !== TEXT_NODE ) {
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child = endContainer.childNodes[ endOffset - 1 ];
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if ( !child || isLeaf( child ) ) {
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break;
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}
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endContainer = child;
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endOffset = getLength( endContainer );
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}
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} else {
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while ( endContainer.nodeType !== TEXT_NODE ) {
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child = endContainer.firstChild;
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if ( !child || isLeaf( child ) ) {
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break;
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}
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endContainer = child;
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}
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}
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// If collapsed, this algorithm finds the nearest text node positions
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// *outside* the range rather than inside, but also it flips which is
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// assigned to which.
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if ( range.collapsed ) {
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range.setStart( endContainer, endOffset );
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range.setEnd( startContainer, startOffset );
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} else {
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range.setStart( startContainer, startOffset );
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range.setEnd( endContainer, endOffset );
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}
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};
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var moveRangeBoundariesUpTree = function ( range, common ) {
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var startContainer = range.startContainer,
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startOffset = range.startOffset,
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endContainer = range.endContainer,
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endOffset = range.endOffset,
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parent;
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if ( !common ) {
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common = range.commonAncestorContainer;
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}
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while ( startContainer !== common && !startOffset ) {
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parent = startContainer.parentNode;
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startOffset = indexOf.call( parent.childNodes, startContainer );
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startContainer = parent;
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}
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while ( endContainer !== common &&
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endOffset === getLength( endContainer ) ) {
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parent = endContainer.parentNode;
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endOffset = indexOf.call( parent.childNodes, endContainer ) + 1;
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endContainer = parent;
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}
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range.setStart( startContainer, startOffset );
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range.setEnd( endContainer, endOffset );
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};
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// Returns the first block at least partially contained by the range,
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// or null if no block is contained by the range.
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var getStartBlockOfRange = function ( range ) {
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var container = range.startContainer,
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block;
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// If inline, get the containing block.
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if ( isInline( container ) ) {
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block = getPreviousBlock( container );
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} else if ( isBlock( container ) ) {
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block = container;
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} else {
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block = getNodeBefore( container, range.startOffset );
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block = getNextBlock( block );
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}
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// Check the block actually intersects the range
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return block && isNodeContainedInRange( range, block, true ) ? block : null;
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};
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// Returns the last block at least partially contained by the range,
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// or null if no block is contained by the range.
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var getEndBlockOfRange = function ( range ) {
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var container = range.endContainer,
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block, child;
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// If inline, get the containing block.
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if ( isInline( container ) ) {
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block = getPreviousBlock( container );
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} else if ( isBlock( container ) ) {
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block = container;
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} else {
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block = getNodeAfter( container, range.endOffset );
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if ( !block ) {
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block = container.ownerDocument.body;
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while ( child = block.lastChild ) {
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block = child;
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}
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}
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block = getPreviousBlock( block );
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}
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// Check the block actually intersects the range
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return block && isNodeContainedInRange( range, block, true ) ? block : null;
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};
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var contentWalker = new TreeWalker( null,
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SHOW_TEXT|SHOW_ELEMENT,
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function ( node ) {
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return node.nodeType === TEXT_NODE ?
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notWS.test( node.data ) :
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node.nodeName === 'IMG';
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}
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);
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var rangeDoesStartAtBlockBoundary = function ( range ) {
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var startContainer = range.startContainer,
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startOffset = range.startOffset;
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// If in the middle or end of a text node, we're not at the boundary.
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if ( startContainer.nodeType === TEXT_NODE ) {
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if ( startOffset ) {
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return false;
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}
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contentWalker.currentNode = startContainer;
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} else {
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contentWalker.currentNode = getNodeAfter( startContainer, startOffset );
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}
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// Otherwise, look for any previous content in the same block.
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contentWalker.root = getStartBlockOfRange( range );
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return !contentWalker.previousNode();
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};
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var rangeDoesEndAtBlockBoundary = function ( range ) {
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var endContainer = range.endContainer,
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endOffset = range.endOffset,
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length;
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// If in a text node with content, and not at the end, we're not
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// at the boundary
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if ( endContainer.nodeType === TEXT_NODE ) {
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length = endContainer.data.length;
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if ( length && endOffset < length ) {
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return false;
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}
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contentWalker.currentNode = endContainer;
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} else {
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contentWalker.currentNode = getNodeBefore( endContainer, endOffset );
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}
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// Otherwise, look for any further content in the same block.
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contentWalker.root = getEndBlockOfRange( range );
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return !contentWalker.nextNode();
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};
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var expandRangeToBlockBoundaries = function ( range ) {
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var start = getStartBlockOfRange( range ),
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end = getEndBlockOfRange( range ),
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parent;
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if ( start && end ) {
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parent = start.parentNode;
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range.setStart( parent, indexOf.call( parent.childNodes, start ) );
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parent = end.parentNode;
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range.setEnd( parent, indexOf.call( parent.childNodes, end ) + 1 );
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}
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};
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