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ETTextTree.m
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ETTextTree.m
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#import <EtoileFoundation/EtoileFoundation.h>
#import "EtoileText.h"
#pragma GCC diagnostic ignored "-Wprotocol"
/**
* String object that represents all of the text contained in an ETText tree.
*/
@interface ETTextString : NSString
@property (nonatomic, retain) id<ETText> text;
@end
@implementation ETTextString
@synthesize text;
- (NSUInteger)length
{
return [text length];
}
- (unichar)characterAtIndex: (NSUInteger)anIndex
{
return [text characterAtIndex: anIndex];
}
- (void)dealloc
{
[text release];
[super dealloc];
}
@end
typedef struct
{
NSUInteger index;
NSUInteger start;
} ETTextTreeChild;
@implementation ETTextTree
@synthesize length, parent, textType, customAttributes;
+ (void)initialize
{
if ([ETTextTree class] != self)
return;
[self applyTraitFromClass: [ETCollectionTrait class]];
[self applyTraitFromClass: [ETMutableCollectionTrait class]];
}
+ (ETEntityDescription*)newEntityDescription
{
ETEntityDescription *entity = [self newBasicEntityDescription];
// For subclasses that don't override -newEntityDescription, we must not add
// the property descriptions that we will inherit through the parent
if ([[entity name] isEqual: [ETTextTree className]] == NO)
return entity;
// FIXME: Support protocol as type for ETText children
ETPropertyDescription *children =
[ETPropertyDescription descriptionWithName: @"children" type: (id)@"ETTextFragment"];
[children setMultivalued: YES];
[children setOrdered: YES];
[children setOpposite: (id)@"ETTextFragment.parent"];
// FIXME: Support protocol as type for ETTextGroup
ETPropertyDescription *parent =
[ETPropertyDescription descriptionWithName: @"parent" type: (id)@"ETTextTree"];
[parent setOpposite: (id)@"ETTextTree.children"];
[parent setDerived: YES];
// FIXME: Define accepted types for persisting textType
ETPropertyDescription *textType =
[ETPropertyDescription descriptionWithName: @"textType" type: (id)@"NSObject"];
ETPropertyDescription *customAttributes =
[ETPropertyDescription descriptionWithName: @"customAttributes" type: (id)@"NSDictionary"];
ETPropertyDescription *stringValue =
[ETPropertyDescription descriptionWithName: @"stringValue" type: (id)@"NSString"];
[stringValue setDerived: YES];
NSArray *transientProperties = A(stringValue);
// FIXME: Include parent among the persistent properties once we support
// modeling relationships around EText/ETGroup protocols
NSArray *persistentProperties = A(children, textType, customAttributes);
[[persistentProperties mappedCollection] setPersistent: YES];
[entity setPropertyDescriptions:
[persistentProperties arrayByAddingObjectsFromArray: transientProperties]];
return entity;
}
+ (ETTextTree*)textTreeWithChildren: (NSArray*)anArray
{
return [[[self alloc] initWithChildren: anArray] autorelease];
}
- (id)initWithChildren: (NSArray*)anArray
{
SUPERINIT;
children = [anArray mutableCopy];
[(id <ETText>)[children mappedCollection] setParent: self];
[self recalculateLength];
return self;
}
- (id)init
{
return [self initWithChildren: [NSArray array]];
}
- (void)dealloc
{
[children release];
[textType release];
[customAttributes release];
[super dealloc];
}
- (void) becomePersistentInContext: (COPersistentRoot*)aContext
{
if ([self isPersistent])
return;
[super becomePersistentInContext: aContext];
for (id <ETText> childNode in children)
{
ETAssert([childNode isKindOfClass: [COObject class]]);
ETAssert([(COObject *)childNode isPersistent]);
[(COObject *)childNode becomePersistentInContext: aContext];
}
}
// FIXME: Disabled relationship consistency because
// -collectionForProperty:removalIndex: cannot access properties through ivar
// but only through KVC. In our case, -children returns a immutable array. So we
// need to implement ETInstanceVariableValueForKey(). Also in the long run, any
// text tree builder should disable relationship consistency temporarily for
// performance reasons (e.g. by setting -[COEditingContext checker] to nil).
- (void)updateRelationshipConsistencyForProperty: (NSString *)key oldValue: (id)oldValue
{
}
- (NSString*)description
{
NSString *typeName = [textType objectForKey: kETTextStyleName];
NSMutableString *desc = [NSMutableString stringWithFormat: @"<%@>", typeName];
for (id child in children)
{
[desc appendString: [child description]];
}
[desc appendFormat: @"</%@>", typeName];
return desc;
}
- (ETTextTreeChild)childNodeForIndex: (NSUInteger)anIndex
{
ETTextTreeChild childNode = { NSNotFound, 0};
// FIXME: O(n) No good!
NSUInteger start = 0;
NSUInteger childIndex = 0;
for (id<ETText> child in children)
{
NSUInteger end = start + child.length;
if (anIndex < end)
{
childNode.index = childIndex;
childNode.start = start;
break;
}
start = end;
childIndex++;
}
return childNode;
}
- (void)insertTextFragment: (id<ETText>)aFragment atIndex: (NSUInteger)anIndex
{
id oldCollection = [[children mutableCopy] autorelease];
[self willChangeValueForProperty: @"children"];
length += [aFragment length];
if (ETUndeterminedIndex == anIndex)
{
[children addObject: aFragment];
}
else
{
[children insertObject: aFragment atIndex: anIndex];
}
aFragment.parent = self;
[parent childDidChange: self];
[self didChangeValueForProperty: @"children" oldValue: oldCollection];
}
- (void)appendTextFragment: (id<ETText>)aFragment
{
[self insertTextFragment: aFragment atIndex: ETUndeterminedIndex];
}
- (void)removeTextFragment: (id<ETText>)aFragment
{
id oldCollection = [[children mutableCopy] autorelease];
[self willChangeValueForProperty: @"children"];
length -= [aFragment length];
[children removeObject: aFragment];
aFragment.parent = nil;
[parent childDidChange: self];
[self didChangeValueForProperty: @"children" oldValue: oldCollection];
}
- (NSArray *)children
{
return [NSArray arrayWithArray: children];
}
- (unichar)characterAtIndex: (NSUInteger)anIndex
{
ETTextTreeChild child = [self childNodeForIndex: anIndex];
return [[children objectAtIndex: child.index]
characterAtIndex: (anIndex - child.start)];
}
- (void)recalculateLength
{
// FIXME: O(n) No good!
NSUInteger newLength = 0;
for (id<ETText> child in children)
{
newLength += child.length;
}
if (newLength != length)
{
length = newLength;
[parent childDidChange: self];
}
}
- (void)childDidChange: (id<ETText>)aChild
{
[self recalculateLength];
}
- (void)replaceCharactersInRange: (NSRange)aRange
withString: (NSString*)aString
{
// Special case for inserting into an empty tree
if (0 == length && aRange.location == 0)
{
ETTextFragment *child =
[[ETTextFragment alloc] initWithString: aString];
[children addObject: child];
[child release];
return;
}
ETTextTreeChild startChild =
[self childNodeForIndex: aRange.location];
id<ETText> child = [children objectAtIndex: startChild.index];
NSUInteger end = [child length];
NSRange replaceRange = { aRange.location - startChild.start, aRange.length};
// If this range is entirely inside this child
if (end <= aRange.length)
{
[child replaceCharactersInRange: replaceRange
withString: aString];
return;
}
replaceRange.length = end;
// Get the end node index, before all of the index mappings change.
ETTextTreeChild endChild =
[self childNodeForIndex: aRange.location + aRange.length];
// Replace the range of text in the first child node with the replacement string
[child replaceCharactersInRange: replaceRange
withString: aString];
// Delete everything from the start child that's in the correct range.
child = [children objectAtIndex: endChild.index];
[child replaceCharactersInRange: replaceRange
withString: @""];
if (endChild.index > startChild.index+1)
{
NSRange deleteRange =
{startChild.index+1, startChild.index+1 - endChild.index};
[children removeObjectsInRange: deleteRange];
[self recalculateLength];
}
}
- (void)appendString: (NSString*)aString;
{
// Special case for inserting into an empty tree
if (0 == length)
{
ETTextFragment *child =
[[ETTextFragment alloc] initWithString: aString];
[children addObject: child];
[child release];
return;
}
[[children lastObject] appendString: aString];
}
- (void)setCustomAttributes: (NSDictionary*)attributes
range: (NSRange)aRange
{
// We have several cases for setting custom attributes. The range may
// entirely cover one or more children. Alternatively, it may partially
// overlap some.
// If the range is the entire node, set the attributes here.
if (0 == aRange.location && aRange.length == length)
{
self.customAttributes = attributes;
return;
}
ETTextTreeChild startChild =
[self childNodeForIndex: aRange.location];
id<ETText> child = [children objectAtIndex: startChild.index];
// If this range doesn't start on a child boundary, split the child
if (startChild.start != aRange.location)
{
id prechild = [child splitAtIndex: aRange.location - startChild.start];
[children insertObject: prechild
atIndex: startChild.index];
startChild.start = aRange.location;
startChild.index++;
}
do
{
NSUInteger childLength = [child length];
// If the end is inside the child, we split the child once again, then
// apply the attributes.
if (childLength >= aRange.length)
{
id prechild = [child splitAtIndex: aRange.length];
[children insertObject: prechild
atIndex: startChild.index];
[prechild setCustomAttributes: attributes
range: NSMakeRange(0, aRange.length)];
return;
}
// Otherwise, set the attributes for the entire range.
[child setCustomAttributes: attributes
range: NSMakeRange(0, aRange.length)];
// Process the next child
startChild.index++;
startChild.start += childLength;
child = [children objectAtIndex: startChild.index];
} while(nil != child);
}
- (NSUInteger)buildStyleFromIndex: (NSUInteger)anIndex
withStyleBuilder: (ETStyleBuilder*)aBuilder
{
return -1;
}
- (id<ETText>)splitAtIndex: (NSUInteger)anIndex
{
ETTextTreeChild splitChild = [self childNodeForIndex: anIndex];
// If the split is not on a node boundary, split the child so that it is
if (splitChild.start != anIndex)
{
id<ETText> child = [children objectAtIndex: splitChild.index];
id prechild = [child splitAtIndex: anIndex - splitChild.start];
[children insertObject: prechild
atIndex: splitChild.index];
splitChild.index++;
}
NSRange firstRange = NSMakeRange(0, splitChild.index);
// Construct the new node containing the first children
NSArray *firstChildren = [children subarrayWithRange: firstRange];
ETTextTree *firstPart = [ETTextTree textTreeWithChildren: firstChildren];
firstPart.customAttributes = customAttributes;
firstPart.textType = textType;
// Remove the children that were added to the other node.
[children removeObjectsInRange: firstRange];
return firstPart;
}
- (void)visitWithVisitor: (id<ETTextVisitor>)aVisitor
{
[aVisitor startTextNode: self];
for (id<ETText> child in children)
{
[child visitWithVisitor: aVisitor];
}
[aVisitor endTextNode: self];
}
- (NSString*)stringValue
{
ETTextString *str = [[ETTextString alloc] init];
str.text = self;
return [str autorelease];
}
- (void)setStringValue: (NSString*)aString
{
[children removeAllObjects];
ETTextFragment *child = [[ETTextFragment alloc] initWithString: aString];
[children addObject: child];
[child release];
[self recalculateLength];
ETAssert([[self stringValue] isEqual: aString]);
}
- (void)replaceChild: oldChild withNode: aNode
{
NSInteger idx = [children indexOfObjectIdenticalTo: oldChild];
if (NSNotFound != idx)
{
if (nil == aNode)
{
[children removeObjectAtIndex: idx];
}
else
{
[children replaceObjectAtIndex: idx
withObject: aNode];
}
[self recalculateLength];
}
}
- (void)replaceInParentWithTextNode: (id<ETText>)aNode
{
[(ETTextTree*)parent replaceChild: self withNode: aNode];
}
- (BOOL)isOrdered
{
return YES;
}
- (id) content
{
return children;
}
- (NSArray *) contentArray
{
return [NSArray arrayWithArray: children];
}
- (void) insertObject: (id)object atIndex: (NSUInteger)index hint: (id)hint
{
[self insertTextFragment: object atIndex: index];
}
- (void) removeObject: (id)object atIndex: (NSUInteger)index hint: (id)hint
{
[self removeTextFragment: object];
}
@end