iska
130 lines
3.1 KiB
Objective-C
130 lines
3.1 KiB
Objective-C
//
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// HTMLRange.m
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// HTMLKit
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//
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// Created by Iska on 20/11/16.
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// Copyright © 2016 BrainCookie. All rights reserved.
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//
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#import "HTMLRange.h"
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#import "HTMLDocument.h"
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#import "HTMLKitDOMExceptions.h"
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@implementation HTMLRange
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#pragma mark - Lifecycle
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- (instancetype)initWithDowcument:(HTMLDocument *)document
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{
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self = [super init];
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if (self) {
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[self setStartNode:document startOffset:0];
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[self setEndNode:document endOffset:0];
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}
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return self;
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}
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#pragma mark - Properties
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- (BOOL)isCollapsed
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{
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return _startContainer == _endContainer && _startOffset == _endOffset;
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}
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- (HTMLNode *)commonAncestorContainer
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{
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HTMLNode *container = _startContainer;
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while (![container containsNode:_endContainer]) {
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container = container.parentNode;
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}
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return container;
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}
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- (HTMLNode *)rootNode
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{
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return _startContainer.rootNode;
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}
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#pragma mark - Boundaries
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NS_INLINE void CheckValidBoundaryNode(HTMLNode *node, NSString *cmd)
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{
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if (node == nil || node.nodeType == HTMLNodeDocumentType) {
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[NSException raise:HTMLKitNotFoundError
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format:@"%@: Invalid Node Type Error, %@ is not a valid range boundary node.",
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cmd, node];
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}
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}
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NS_INLINE void CheckValidBoundaryOffset(HTMLNode *node, NSUInteger offset, NSString *cmd)
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{
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if (node == nil || node.nodeType == HTMLNodeDocumentType) {
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[NSException raise:HTMLKitIndexSizeError
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format:@"%@: Index Size Error, invalid index %lu for range boundary node %@.",
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cmd, (unsigned long)offset, node];
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}
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}
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NS_INLINE NSComparisonResult CompareBoundaries(HTMLNode *startNode, NSUInteger startOffset, HTMLNode *endNode, NSUInteger endOffset)
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{
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if (startNode == endNode) {
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if (startOffset == endOffset) {
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return NSOrderedSame;
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} else if (startOffset < endOffset) {
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return NSOrderedAscending;
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} else {
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return NSOrderedDescending;
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}
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}
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HTMLDocumentPosition position = [startNode compareDocumentPositionWithNode:endNode];
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if ((position & HTMLDocumentPositionFollowing) == HTMLDocumentPositionFollowing) {
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// Check Spec
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}
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if ([startNode containsNode:endNode]) {
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HTMLNode *child = endNode;
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while (child.parentNode != startNode) {
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child = child.parentNode;
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}
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if ([child.parentNode indexOfChildNode:child] > startOffset) {
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return NSOrderedDescending;
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}
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}
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return NSOrderedAscending;
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}
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- (void)setStartNode:(HTMLNode *)node startOffset:(NSUInteger)offset
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{
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CheckValidBoundaryNode(node, NSStringFromSelector(_cmd));
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CheckValidBoundaryOffset(node, offset, NSStringFromSelector(_cmd));
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if (self.rootNode != node.rootNode ||
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CompareBoundaries(node, offset, _endContainer, _endOffset) == NSOrderedDescending) {
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_endContainer = node;
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_endOffset = offset;
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}
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_startContainer = node;
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_startOffset = offset;
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}
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- (void)setEndNode:(HTMLNode *)node endOffset:(NSUInteger)offset
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{
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CheckValidBoundaryNode(node, NSStringFromSelector(_cmd));
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CheckValidBoundaryOffset(node, offset, NSStringFromSelector(_cmd));
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if (self.rootNode != node.rootNode ||
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CompareBoundaries(node, offset, _startContainer, _startOffset) == NSOrderedAscending) {
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_startContainer = node;
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_startOffset = offset;
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}
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_endContainer = node;
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_endOffset = offset;
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}
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@end
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