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//
// DTHTMLAttributedStringBuilder.m
// DTCoreText
//
// Created by Oliver Drobnik on 21.01.12.
// Copyright (c) 2012 Drobnik.com. All rights reserved.
//

#import "DTHTMLAttributedStringBuilder.h"

#import "DTCoreTextConstants.h"
#import "DTCSSStylesheet.h"
#import "DTCoreTextFontDescriptor.h"
#import "DTCoreTextParagraphStyle.h"
#import "DTTextAttachment.h"

#import "DTColor+HTML.h"
#import "DTImage+HTML.h"

#import "NSString+HTML.h"
#import "NSString+CSS.h"
#import "NSMutableString+HTML.h"


@interface DTHTMLAttributedStringBuilder ()

- (void)_registerTagStartHandlers;
- (void)_registerTagEndHandlers;
- (void)_flushCurrentTagContent:(NSString *)tagContent;
- (void)_flushListPrefix;

@end


@implementation DTHTMLAttributedStringBuilder
{
NSData *_data;
NSDictionary *_options;

// settings for parsing
CGFloat textScale;
DTColor *defaultLinkColor;
DTCSSStylesheet *_globalStyleSheet;
NSURL *baseURL;
DTCoreTextFontDescriptor *defaultFontDescriptor;
DTCoreTextParagraphStyle *defaultParagraphStyle;

// parsing state, accessed from inside blocks
NSMutableAttributedString *tmpString;
NSMutableString *_currentTagContents;

DTHTMLElement *currentTag;
BOOL needsListItemStart;
BOOL needsNewLineBefore;
BOOL outputHasNewline;
BOOL currentTagIsEmpty; // YES for each opened tag, NO for anything flushed including hr, br, img -> adds an extra NL for <p></p>

// GCD
dispatch_queue_t _stringAssemblyQueue;
dispatch_group_t _stringAssemblyGroup;
dispatch_queue_t _stringParsingQueue;
dispatch_group_t _stringParsingGroup;

// lookup table for blocks that deal with begin and end tags
NSMutableDictionary *_tagStartHandlers;
NSMutableDictionary *_tagEndHandlers;

DTHTMLAttributedStringBuilderWillFlushCallback _willFlushCallback;
}

- (id)initWithHTML:(NSData *)data options:(NSDictionary *)options documentAttributes:(NSDictionary **)dict
{
self = [super init];
if (self)
{
_data = data;
_options = options;

// documentAttributes ignored for now

//GCD setup
_stringAssemblyQueue = dispatch_queue_create("DTHTMLAttributedStringBuilder", 0);
_stringAssemblyGroup = dispatch_group_create();
_stringParsingQueue = dispatch_queue_create("DTHTMLAttributedStringBuilderParser", 0);
_stringParsingGroup = dispatch_group_create();
}

return self;
}

- (void)dealloc
{
dispatch_release(_stringAssemblyQueue);
dispatch_release(_stringAssemblyGroup);
dispatch_release(_stringParsingQueue);
dispatch_release(_stringParsingGroup);
}

- (BOOL)buildString
{
// only with valid data
if (![_data length])
{
return NO;
}

// register default handlers
[self _registerTagStartHandlers];
[self _registerTagEndHandlers];

  // Specify the appropriate text encoding for the passed data, default is UTF8
NSString *textEncodingName = [_options objectForKey:NSTextEncodingNameDocumentOption];
NSStringEncoding encoding = NSUTF8StringEncoding; // default

if (textEncodingName)
{
CFStringEncoding cfEncoding = CFStringConvertIANACharSetNameToEncoding((__bridge CFStringRef)textEncodingName);
encoding = CFStringConvertEncodingToNSStringEncoding(cfEncoding);
}

// custom option to scale text
textScale = [[_options objectForKey:NSTextSizeMultiplierDocumentOption] floatValue];
if (!textScale)
{
textScale = 1.0f;
}

// use baseURL from options if present
baseURL = [_options objectForKey:NSBaseURLDocumentOption];


// Make it a string
NSString *htmlString;

if (encoding == NSUTF8StringEncoding)
{
// this method can fix malformed UTF8
htmlString = [[NSString alloc] initWithPotentiallyMalformedUTF8Data:_data];
}
else
{
// use the specified encoding
htmlString = [[NSString alloc] initWithData:_data encoding:encoding];
}

if (!htmlString)
{
return NO;
}

// the combined style sheet for entire document
_globalStyleSheet = [DTCSSStylesheet defaultStyleSheet];

// do we have a default style sheet passed as option?
DTCSSStylesheet *defaultStylesheet = [_options objectForKey:DTDefaultStyleSheet];
if (defaultStylesheet)
{
// merge the default styles to the combined style sheet
[_globalStyleSheet mergeStylesheet:defaultStylesheet];
}

// for performance we will return this mutable string
tmpString = [[NSMutableAttributedString alloc] init];

needsListItemStart = NO;
needsNewLineBefore = NO;

// we cannot skip any characters, NLs turn into spaces and multi-spaces get compressed to singles
NSScanner *scanner = [NSScanner scannerWithString:htmlString];
scanner.charactersToBeSkipped = nil;

// base tag with font defaults
defaultFontDescriptor = [[DTCoreTextFontDescriptor alloc] initWithFontAttributes:nil];
defaultFontDescriptor.pointSize = 12.0f * textScale;

NSString *defaultFontFamily = [_options objectForKey:DTDefaultFontFamily];
if (defaultFontFamily)
{
defaultFontDescriptor.fontFamily = defaultFontFamily;
}
else
{
defaultFontDescriptor.fontFamily = @"Times New Roman";
}

defaultLinkColor = [_options objectForKey:DTDefaultLinkColor];

if (defaultLinkColor)
{
if ([defaultLinkColor isKindOfClass:[NSString class]])
{
// convert from string to color
defaultLinkColor = [DTColor colorWithHTMLName:(NSString *)defaultLinkColor];
}

// get hex code for t he passed color
NSString *colorHex = [defaultLinkColor htmlHexString];

// overwrite the style
NSString *styleBlock = [NSString stringWithFormat:@"a {color:#%@;}", colorHex];
[_globalStyleSheet parseStyleBlock:styleBlock];
}

// default is to have A underlined
NSNumber *linkDecorationDefault = [_options objectForKey:DTDefaultLinkDecoration];

if (linkDecorationDefault)
{
if (![linkDecorationDefault boolValue])
{
// remove default decoration
[_globalStyleSheet parseStyleBlock:@"a {text-decoration:none;}"];
}
}

// default paragraph style
defaultParagraphStyle = [DTCoreTextParagraphStyle defaultParagraphStyle];

NSNumber *defaultLineHeightMultiplierNum = [_options objectForKey:DTDefaultLineHeightMultiplier];

if (defaultLineHeightMultiplierNum)
{
CGFloat defaultLineHeightMultiplier = [defaultLineHeightMultiplierNum floatValue];
defaultParagraphStyle.lineHeightMultiple = defaultLineHeightMultiplier;
}

NSNumber *defaultTextAlignmentNum = [_options objectForKey:DTDefaultTextAlignment];

if (defaultTextAlignmentNum)
{
defaultParagraphStyle.alignment = (CTTextAlignment)[defaultTextAlignmentNum integerValue];
}

NSNumber *defaultFirstLineHeadIndent = [_options objectForKey:DTDefaultFirstLineHeadIndent];
if (defaultFirstLineHeadIndent)
{
defaultParagraphStyle.firstLineHeadIndent = [defaultFirstLineHeadIndent integerValue];
}

NSNumber *defaultHeadIndent = [_options objectForKey:DTDefaultHeadIndent];
if (defaultHeadIndent)
{
defaultParagraphStyle.headIndent = [defaultHeadIndent integerValue];
}

NSNumber *defaultListIndent = [_options objectForKey:DTDefaultListIndent];
if (defaultListIndent)
{
defaultParagraphStyle.listIndent = [defaultListIndent integerValue];
}

DTHTMLElement *defaultTag = [[DTHTMLElement alloc] init];
defaultTag.fontDescriptor = defaultFontDescriptor;
defaultTag.paragraphStyle = defaultParagraphStyle;
defaultTag.textScale = textScale;

id defaultColor = [_options objectForKey:DTDefaultTextColor];
if (defaultColor)
{
if ([defaultColor isKindOfClass:[DTColor class]])
{
// already a DTColor
defaultTag.textColor = defaultColor;
}
else
{
// need to convert first
defaultTag.textColor = [DTColor colorWithHTMLName:defaultColor];
}
}


currentTag = defaultTag; // our defaults are the root

// create a parser
DTHTMLParser *parser = [[DTHTMLParser alloc] initWithData:_data encoding:encoding];
parser.delegate = (id)self;

__block BOOL result;
dispatch_group_async(_stringParsingGroup, _stringParsingQueue, ^{ result = [parser parse]; });

// wait until all string assembly is complete
dispatch_group_wait(_stringParsingGroup, DISPATCH_TIME_FOREVER);
dispatch_group_wait(_stringAssemblyGroup, DISPATCH_TIME_FOREVER);

// clean up handlers because they retained self
_tagStartHandlers = nil;
_tagEndHandlers = nil;

return result;
}

- (NSAttributedString *)generatedAttributedString
{
return tmpString;
}

#pragma mark GCD

- (void)_registerTagStartHandlers
{
if (_tagStartHandlers)
{
return;
}

_tagStartHandlers = [[NSMutableDictionary alloc] init];

void (^imgBlock)(void) = ^
{
// float causes the image to be its own block
if (currentTag.floatStyle != DTHTMLElementFloatStyleNone)
{
currentTag.displayStyle = DTHTMLElementDisplayStyleBlock;
}

// hide contents of recognized tag
currentTag.tagContentInvisible = YES;

// make appropriate attachment
DTTextAttachment *attachment = [DTTextAttachment textAttachmentWithElement:currentTag options:_options];

// add it to tag
currentTag.textAttachment = attachment;

// to avoid much too much space before the image
currentTag.paragraphStyle.lineHeightMultiple = 1;

// specifiying line height interfers with correct positioning
currentTag.paragraphStyle.minimumLineHeight = 0;
currentTag.paragraphStyle.maximumLineHeight = 0;

// caller gets opportunity to modify image tag before it is written
if (_willFlushCallback)
{
_willFlushCallback(currentTag);
}

// maybe the image is forced to show as block, then we want a newline before and after
if (currentTag.displayStyle == DTHTMLElementDisplayStyleBlock)
{
needsNewLineBefore = YES;
}

if (needsNewLineBefore)
{
if ([tmpString length] && !outputHasNewline)
{
[tmpString appendNakedString:@"\n"];
outputHasNewline = YES;
}

needsNewLineBefore = NO;
}

// add it to output
[tmpString appendAttributedString:[currentTag attributedString]];
outputHasNewline = NO;
currentTagIsEmpty = NO;
};

[_tagStartHandlers setObject:[imgBlock copy] forKey:@"img"];


void (^blockquoteBlock)(void) = ^
{
currentTag.paragraphStyle.headIndent += 25.0 * textScale;
currentTag.paragraphStyle.firstLineHeadIndent = currentTag.paragraphStyle.headIndent;
currentTag.paragraphStyle.paragraphSpacing = defaultFontDescriptor.pointSize;
};

[_tagStartHandlers setObject:[blockquoteBlock copy] forKey:@"blockquote"];


void (^objectBlock)(void) = ^
{
// hide contents of recognized tag
currentTag.tagContentInvisible = YES;

// make appropriate attachment
DTTextAttachment *attachment = [DTTextAttachment textAttachmentWithElement:currentTag options:_options];

// add it to tag
currentTag.textAttachment = attachment;

// to avoid much too much space before the image
currentTag.paragraphStyle.lineHeightMultiple = 1;

// caller gets opportunity to modify object tag before it is written
if (_willFlushCallback)
{
_willFlushCallback(currentTag);
}

// maybe the image is forced to show as block, then we want a newline before and after
if (currentTag.displayStyle == DTHTMLElementDisplayStyleBlock)
{
needsNewLineBefore = YES;
}

if (needsNewLineBefore)
{
if ([tmpString length] && !outputHasNewline)
{
[tmpString appendNakedString:@"\n"];
outputHasNewline = YES;
}

needsNewLineBefore = NO;
}

// add it to output
[tmpString appendAttributedString:[currentTag attributedString]];
outputHasNewline = NO;
currentTagIsEmpty = NO;
};

[_tagStartHandlers setObject:[objectBlock copy] forKey:@"object"];
[_tagStartHandlers setObject:[objectBlock copy] forKey:@"video"];
[_tagStartHandlers setObject:[objectBlock copy] forKey:@"iframe"];


void (^aBlock)(void) = ^
{
if (currentTag.isColorInherited || !currentTag.textColor)
{
currentTag.textColor = defaultLinkColor;
currentTag.isColorInherited = NO;
}

// remove line breaks and whitespace in links
NSString *cleanString = [[currentTag attributeForKey:@"href"] stringByReplacingOccurrencesOfString:@"\n" withString:@""];
cleanString = [cleanString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];

NSURL *link = [NSURL URLWithString:cleanString];

// deal with relative URL
if (![link scheme])
{
if ([cleanString length])
{
link = [NSURL URLWithString:cleanString relativeToURL:baseURL];

if (!link)
{
// NSURL did not like the link, so let's encode it
cleanString = [cleanString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

link = [NSURL URLWithString:cleanString relativeToURL:baseURL];
}
}
else
{
link = baseURL;
}
}

currentTag.link = link;
};

[_tagStartHandlers setObject:[aBlock copy] forKey:@"a"];


void (^liBlock)(void) = ^
{
needsListItemStart = YES;
currentTag.paragraphStyle.paragraphSpacing = 0;
currentTag.paragraphStyle.firstLineHeadIndent = currentTag.paragraphStyle.headIndent;
currentTag.paragraphStyle.headIndent += currentTag.paragraphStyle.listIndent;

// first tab is to right-align bullet, numbering against
CGFloat tabOffset = currentTag.paragraphStyle.headIndent - 5.0f*textScale;
[currentTag.paragraphStyle addTabStopAtPosition:tabOffset alignment:kCTRightTextAlignment];

// second tab is for the beginning of first line after bullet
[currentTag.paragraphStyle addTabStopAtPosition:currentTag.paragraphStyle.headIndent alignment: kCTLeftTextAlignment];
};

[_tagStartHandlers setObject:[liBlock copy] forKey:@"li"];


void (^listBlock)(void) = ^
{
#if TARGET_OS_IPHONE
if (needsListItemStart)
{
// we have an opening but not have flushed text since
needsNewLineBefore = YES;

currentTag.paragraphStyle.paragraphSpacing = 0;

if (needsNewLineBefore)
{
if (!outputHasNewline)
{
[tmpString appendString:@"\n"];
outputHasNewline = YES;
}

needsNewLineBefore = NO;
}

// output the prefix
[self _flushListPrefix];
}
#endif
needsNewLineBefore = YES;

// create the appropriate list style from CSS
NSDictionary *styles = [currentTag styles];
DTCSSListStyle *newListStyle = [[DTCSSListStyle alloc] initWithStyles:styles];

// append this list style to the current paragraph style text lists
NSMutableArray *textLists = [currentTag.paragraphStyle.textLists mutableCopy];
if (!textLists)
{
textLists = [NSMutableArray array];
}

[textLists addObject:newListStyle];

// workaround for different styles on stacked lists
if ([textLists count]>1) // not necessary for first
{
// find out if each list is ordered or unordered
NSMutableArray *tmpArray = [NSMutableArray array];
for (DTCSSListStyle *oneList in textLists)
{
if ([oneList isOrdered])
{
[tmpArray addObject:@"ol"];
}
else
{
[tmpArray addObject:@"ul"];
}
}

// build a CSS selector
NSString *selector = [tmpArray componentsJoinedByString:@" "];

// find style
NSDictionary *style = [[_globalStyleSheet styles] objectForKey:selector];

if (style)
{
[newListStyle updateFromStyleDictionary:style];
}
}

currentTag.paragraphStyle.textLists = textLists;

// next text needs a NL before it
needsNewLineBefore = YES;
};

[_tagStartHandlers setObject:[listBlock copy] forKey:@"ul"];
[_tagStartHandlers setObject:[listBlock copy] forKey:@"ol"];



void (^hrBlock)(void) = ^
{
// open block needs closing
if (needsNewLineBefore)
{
if ([tmpString length] && !outputHasNewline)
{
[tmpString appendNakedString:@"\n"];
outputHasNewline = YES;
}

needsNewLineBefore = NO;
}

currentTag.text = @"\n";

NSMutableDictionary *styleDict = [NSMutableDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:@"Dummy"];

if (currentTag.backgroundColor)
{
[styleDict setObject:currentTag.backgroundColor forKey:@"BackgroundColor"];
}
[currentTag addAdditionalAttribute:styleDict forKey:DTHorizontalRuleStyleAttribute];

[tmpString appendAttributedString:[currentTag attributedString]];
outputHasNewline = YES;
currentTagIsEmpty = NO;
};

[_tagStartHandlers setObject:[hrBlock copy] forKey:@"hr"];


void (^h1Block)(void) = ^
{
currentTag.headerLevel = 1;
};
[_tagStartHandlers setObject:[h1Block copy] forKey:@"h1"];


void (^h2Block)(void) = ^
{
currentTag.headerLevel = 2;
};
[_tagStartHandlers setObject:[h2Block copy] forKey:@"h2"];


void (^h3Block)(void) = ^
{
currentTag.headerLevel = 3;
};
[_tagStartHandlers setObject:[h3Block copy] forKey:@"h3"];


void (^h4Block)(void) = ^
{
currentTag.headerLevel = 4;
};
[_tagStartHandlers setObject:[h4Block copy] forKey:@"h4"];


void (^h5Block)(void) = ^
{
currentTag.headerLevel = 5;
};
[_tagStartHandlers setObject:[h5Block copy] forKey:@"h5"];


void (^h6Block)(void) = ^
{
currentTag.headerLevel = 6;
};
[_tagStartHandlers setObject:[h6Block copy] forKey:@"h6"];


void (^fontBlock)(void) = ^
{
NSInteger size = [[currentTag attributeForKey:@"size"] intValue];

switch (size)
{
case 1:
currentTag.fontDescriptor.pointSize = textScale * 9.0f;
break;
case 2:
currentTag.fontDescriptor.pointSize = textScale * 10.0f;
break;
case 4:
currentTag.fontDescriptor.pointSize = textScale * 14.0f;
break;
case 5:
currentTag.fontDescriptor.pointSize = textScale * 18.0f;
break;
case 6:
currentTag.fontDescriptor.pointSize = textScale * 24.0f;
break;
case 7:
currentTag.fontDescriptor.pointSize = textScale * 37.0f;
break;
case 3:
default:
currentTag.fontDescriptor.pointSize = defaultFontDescriptor.pointSize;
break;
}

NSString *face = [currentTag attributeForKey:@"face"];

if (face)
{
currentTag.fontDescriptor.fontName = face;

// face usually invalidates family
currentTag.fontDescriptor.fontFamily = nil;
}

NSString *color = [currentTag attributeForKey:@"color"];

if (color)
{
currentTag.textColor = [DTColor colorWithHTMLName:color];
}
};

[_tagStartHandlers setObject:[fontBlock copy] forKey:@"font"];


void (^pBlock)(void) = ^
{
currentTag.paragraphStyle.firstLineHeadIndent = currentTag.paragraphStyle.headIndent + defaultParagraphStyle.firstLineHeadIndent;
};

[_tagStartHandlers setObject:[pBlock copy] forKey:@"p"];


void (^brBlock)(void) = ^
{
currentTag.text = UNICODE_LINE_FEED;

// NOTE: cannot use flush because that removes the break
[tmpString appendAttributedString:[currentTag attributedString]];
outputHasNewline = NO;
currentTagIsEmpty = NO;
};

[_tagStartHandlers setObject:[brBlock copy] forKey:@"br"];
}

- (void)_registerTagEndHandlers
{
if (_tagEndHandlers)
{
return;
}

_tagEndHandlers = [[NSMutableDictionary alloc] init];

void (^bodyBlock)(void) = ^
{
// if the last child was a block we need an extra \n
if (needsNewLineBefore)
{
if ([tmpString length] && !outputHasNewline)
{
[tmpString appendString:@"\n"];
outputHasNewline = YES;
}

needsNewLineBefore = NO;
}
};

[_tagEndHandlers setObject:[bodyBlock copy] forKey:@"body"];


void (^liBlock)(void) = ^
{
needsListItemStart = NO;
};

[_tagEndHandlers setObject:[liBlock copy] forKey:@"li"];


void (^ulBlock)(void) = ^
{
// pop the current list style from the paragraph style text lists
NSMutableArray *textLists = [currentTag.paragraphStyle.textLists mutableCopy];
[textLists removeLastObject];
currentTag.paragraphStyle.textLists = textLists;

// if this was the last active list
if ([textLists count]==0)
{
// adjust spacing after last li to be the one defined for ol/ul
NSInteger index = [tmpString length];

if (index)
{
index--;

// get the paragraph style for the previous paragraph
NSRange effectiveRange;
CTParagraphStyleRef prevParagraphStyle = (__bridge CTParagraphStyleRef)[tmpString attribute:(id)kCTParagraphStyleAttributeName
atIndex:index
effectiveRange:&effectiveRange];

// convert it to DTCoreText
DTCoreTextParagraphStyle *paragraphStyle = [DTCoreTextParagraphStyle paragraphStyleWithCTParagraphStyle:prevParagraphStyle];

if (paragraphStyle.paragraphSpacing != currentTag.paragraphStyle.paragraphSpacing)
{
paragraphStyle.paragraphSpacing = currentTag.paragraphStyle.paragraphSpacing;

CTParagraphStyleRef newParagraphStyle = [paragraphStyle createCTParagraphStyle];

// because we have multiple paragraph styles per paragraph still, we need to extend towards the begin of the paragraph
NSRange paragraphRange = [[tmpString string] rangeOfParagraphAtIndex:effectiveRange.location];

[tmpString addAttribute:(id)kCTParagraphStyleAttributeName value:CFBridgingRelease(newParagraphStyle) range:paragraphRange];
}
}
}
};

[_tagEndHandlers setObject:[ulBlock copy] forKey:@"ul"];
[_tagEndHandlers setObject:[ulBlock copy] forKey:@"ol"];

void (^pBlock)(void) = ^
{
if (currentTagIsEmpty)
{
// empty paragraph

// end of P we always add a newline
[tmpString appendString:@"\n" withParagraphStyle:currentTag.paragraphStyle fontDescriptor:currentTag.fontDescriptor];
}
else
{
// extend previous tag contents
[tmpString appendString:@"\n"];
}
outputHasNewline = YES;
};

[_tagEndHandlers setObject:[pBlock copy] forKey:@"p"];
}

- (void)_handleTagContent:(NSString *)string
{
NSAssert(dispatch_get_current_queue() == _stringAssemblyQueue, @"method called from invalid queue");

if (!_currentTagContents)
{
_currentTagContents = [[NSMutableString alloc] initWithCapacity:1000];
}

[_currentTagContents appendString:string];
}


- (void)_flushListPrefix
{
// if we start a list, then we wait until we have actual text
if (needsListItemStart)
{
DTCSSListStyle *effectiveList = [currentTag.paragraphStyle.textLists lastObject];

NSInteger index = [tmpString length]-1;
NSInteger counter = 0;

if (index>0)
{
// check if there was a list item before this one
index--;

NSRange prevListRange;
NSArray *prevLists = [tmpString attribute:DTTextListsAttribute atIndex:index effectiveRange:&prevListRange];

if ([prevLists containsObject:effectiveList])
{
NSInteger prevItemIndex = [tmpString itemNumberInTextList:effectiveList atIndex:index];
counter = prevItemIndex + 1;
}
else
{
// new list start
counter = [effectiveList startingItemNumber];
}
}
else
{
// new list start at beginning of string
counter = [effectiveList startingItemNumber];
}

NSAttributedString *prefixString = [currentTag prefixForListItemWithCounter:counter];

if (prefixString)
{
[tmpString appendAttributedString:prefixString];
outputHasNewline = NO;
}

needsListItemStart = NO;
}
}

- (void)_flushCurrentTagContent:(NSString *)tagContent
{
NSAssert(dispatch_get_current_queue() == _stringAssemblyQueue, @"method called from invalid queue");

// trim newlines
NSString *tagContents = tagContent;

if (![tagContents length])
{
// nothing to do
return;
}

if (currentTag.preserveNewlines)
{
tagContents = [tagContent stringByTrimmingCharactersInSet:[NSCharacterSet newlineCharacterSet]];

tagContents = [tagContents stringByReplacingOccurrencesOfString:@"\n" withString:UNICODE_LINE_FEED];
}
else
{
tagContents = [tagContents stringByNormalizingWhitespace];

if ([tagContents isEqualToString:@" "])
{
return;
}
}

if (needsNewLineBefore)
{
if ([tagContents hasPrefix:@" "])
{
tagContents = [tagContents substringFromIndex:1];
}

if ([tmpString length])
{
if (!outputHasNewline)
{
[tmpString appendString:@"\n"];
outputHasNewline = YES;
}
}

needsNewLineBefore = NO;
}
else // might be a continuation of a paragraph, then we might need space before it
{
NSString *stringSoFar = [tmpString string];

// prevent double spacing
if ([stringSoFar hasSuffixCharacterFromSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] && [tagContents hasPrefix:@" "])
{
tagContents = [tagContents substringFromIndex:1];
}
}

// if we start a list, then we wait until we have actual text
if (needsListItemStart && [tagContents length] > 0 && ![tagContents isEqualToString:@" "])
{
[self _flushListPrefix];
}

// we don't want whitespace before first tag to turn into paragraphs
if (!(currentTag.displayStyle == DTHTMLElementDisplayStyleNone) && !currentTag.tagContentInvisible)
{
currentTag.text = tagContents;

if (_willFlushCallback)
{
_willFlushCallback(currentTag);
}

[tmpString appendAttributedString:[currentTag attributedString]];
outputHasNewline = NO;

// we've written something
currentTagIsEmpty = NO;
}

_currentTagContents = nil;
}

#pragma mark DTHTMLParser Delegate

- (void)parser:(DTHTMLParser *)parser didStartElement:(NSString *)elementName attributes:(NSDictionary *)attributeDict
{
void (^tmpBlock)(void) = ^
{
DTHTMLElement *parent = currentTag;
DTHTMLElement *nextTag = [currentTag copy];
nextTag.tagName = elementName;
nextTag.textScale = textScale;
nextTag.attributes = attributeDict;
[parent addChild:nextTag];

// apply style from merged style sheet
NSDictionary *mergedStyles = [_globalStyleSheet mergedStyleDictionaryForElement:nextTag];
if (mergedStyles)
{
[nextTag applyStyleDictionary:mergedStyles];
}

BOOL removeUnflushedWhitespace = NO;

// keep currentTag, might be used in flush
if (_currentTagContents)
{
// remove whitespace suffix in current non-block item
if (nextTag.displayStyle == DTHTMLElementDisplayStyleBlock)
{
if (currentTag.displayStyle != DTHTMLElementDisplayStyleBlock)
{
[_currentTagContents removeTrailingWhitespace];
}

removeUnflushedWhitespace = YES;
}
}

[self _flushCurrentTagContent:_currentTagContents];

// avoid transfering space from parent tag
if (removeUnflushedWhitespace)
{
_currentTagContents = nil;
}

// keep track of something was flushed for this tag
currentTagIsEmpty = YES;

// switch to new tag
currentTag = nextTag;

if (currentTag.displayStyle == DTHTMLElementDisplayStyleNone)
{
// we don't care about the other stuff in META tags, but styles are inherited
return;
}

if (currentTag.displayStyle == DTHTMLElementDisplayStyleBlock || currentTag.displayStyle == DTHTMLElementDisplayStyleListItem)
{
// make sure that we have a NL before text in this block
needsNewLineBefore = YES;
}

// direction
NSString *direction = [currentTag attributeForKey:@"dir"];

if (direction)
{
NSString *lowerDirection = [direction lowercaseString];


if ([lowerDirection isEqualToString:@"ltr"])
{
currentTag.paragraphStyle.baseWritingDirection = kCTWritingDirectionLeftToRight;
}
else if ([lowerDirection isEqualToString:@"rtl"])
{
currentTag.paragraphStyle.baseWritingDirection = kCTWritingDirectionRightToLeft;
}
}

// find block to execute for this tag if any
void (^tagBlock)(void) = [_tagStartHandlers objectForKey:elementName];

if (tagBlock)
{
tagBlock();
}
};

dispatch_group_async(_stringAssemblyGroup, _stringAssemblyQueue, tmpBlock);
}

- (void)parser:(DTHTMLParser *)parser didEndElement:(NSString *)elementName
{
void (^tmpBlock)(void) = ^
{
if (_currentTagContents)
{
// trim off white space at end if block
if (currentTag.displayStyle != DTHTMLElementDisplayStyleInline)
{
[_currentTagContents removeTrailingWhitespace];
}

[self _flushCurrentTagContent:_currentTagContents];
}

// find block to execute for this tag if any
void (^tagBlock)(void) = [_tagEndHandlers objectForKey:elementName];

if (tagBlock)
{
tagBlock();
}

if (currentTag.displayStyle == DTHTMLElementDisplayStyleBlock)
{
needsNewLineBefore = YES;
}

// check if this tag is indeed closing the currently open one
if ([elementName isEqualToString:currentTag.tagName])
{
DTHTMLElement *popChild = currentTag;
currentTag = currentTag.parent;
[currentTag removeChild:popChild];
}
else
{
// Ignoring non-open tag
}
};

dispatch_group_async(_stringAssemblyGroup, _stringAssemblyQueue, tmpBlock);
}

- (void)parser:(DTHTMLParser *)parser foundCharacters:(NSString *)string
{
dispatch_group_async(_stringAssemblyGroup, _stringAssemblyQueue,^{
[self _handleTagContent:string];
});
}

- (void)parser:(DTHTMLParser *)parser foundCDATA:(NSData *)CDATABlock
{
dispatch_group_async(_stringAssemblyGroup, _stringAssemblyQueue,^{
if ([currentTag.tagName isEqualToString:@"style"])
{
NSString *styleBlock = [[NSString alloc] initWithData:CDATABlock encoding:NSUTF8StringEncoding];
[_globalStyleSheet parseStyleBlock:styleBlock];
}
});
}

#pragma mark Properties

@synthesize willFlushCallback = _willFlushCallback;

@end
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