/
NSAttributedString+HTML.m
executable file
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NSAttributedString+HTML.m
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//
// NSAttributedString+HTML.m
// CoreTextExtensions
//
// Created by Oliver Drobnik on 1/9/11.
// Copyright 2011 Drobnik.com. All rights reserved.
//
#import <CoreText/CoreText.h>
#import <UIKit/UIKit.h>
#import "NSAttributedString+HTML.h"
#import "NSMutableAttributedString+HTML.h"
#import "NSString+HTML.h"
#import "UIColor+HTML.h"
#import "NSScanner+HTML.h"
#import "NSCharacterSet+HTML.h"
#import "NSAttributedStringRunDelegates.h"
#import "DTTextAttachment.h"
#import "DTHTMLElement.h"
#import "DTCSSListStyle.h"
#import "DTCSSStylesheet.h"
#import "DTCoreTextFontDescriptor.h"
#import "DTCoreTextParagraphStyle.h"
#import "CGUtils.h"
#import "NSString+UTF8Cleaner.h"
// standard options
NSString *NSBaseURLDocumentOption = @"NSBaseURLDocumentOption";
NSString *NSTextEncodingNameDocumentOption = @"NSTextEncodingNameDocumentOption";
NSString *NSTextSizeMultiplierDocumentOption = @"NSTextSizeMultiplierDocumentOption";
// custom options
NSString *DTMaxImageSize = @"DTMaxImageSize";
NSString *DTDefaultFontFamily = @"DTDefaultFontFamily";
NSString *DTDefaultTextColor = @"DTDefaultTextColor";
NSString *DTDefaultLinkColor = @"DTDefaultLinkColor";
NSString *DTDefaultLinkDecoration = @"DTDefaultLinkDecoration";
NSString *DTDefaultTextAlignment = @"DTDefaultTextAlignment";
NSString *DTDefaultLineHeightMultiplier = @"DTDefaultLineHeightMultiplier";
NSString *DTDefaultFirstLineHeadIndent = @"DTDefaultFirstLineHeadIndent";
NSString *DTDefaultHeadIndent = @"DTDefaultHeadIndent";
NSString *DTDefaultListIndent = @"DTDefaultListIndent";
@implementation NSAttributedString (HTML)
- (id)initWithHTML:(NSData *)data documentAttributes:(NSDictionary **)dict
{
return [self initWithHTML:data options:nil documentAttributes:dict];
}
- (id)initWithHTML:(NSData *)data baseURL:(NSURL *)base documentAttributes:(NSDictionary **)dict
{
NSDictionary *optionsDict = nil;
if (base)
{
optionsDict = [NSDictionary dictionaryWithObject:base forKey:NSBaseURLDocumentOption];
}
return [self initWithHTML:data options:optionsDict documentAttributes:dict];
}
- (id)initWithHTML:(NSData *)data options:(NSDictionary *)options documentAttributes:(NSDictionary **)dict
{
// only with valid data
if (![data length])
{
[self release];
return nil;
}
// 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((CFStringRef)textEncodingName);
encoding = CFStringConvertEncodingToNSStringEncoding(cfEncoding);
}
// custom option to scale text
CGFloat textScale = [[options objectForKey:NSTextSizeMultiplierDocumentOption] floatValue];
if (!textScale)
{
textScale = 1.0f;
}
// use baseURL from options if present
NSURL *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)
{
NSLog(@"No valid HTML passed to to initWithHTML");
[self release];
return nil;
}
// the combined style sheet for entire document
DTCSSStylesheet *styleSheet = [[[DTCSSStylesheet alloc] init] autorelease];
// default list styles
[styleSheet parseStyleBlock:@"ul {list-style:disc;} ol {list-style:decimal;}"];
// for performance we will return this mutable string
NSMutableAttributedString *tmpString = [[NSMutableAttributedString alloc] init];
#if ALLOW_IPHONE_SPECIAL_CASES
CGFloat nextParagraphAdditionalSpaceBefore = 0.0;
#endif
BOOL needsListItemStart = NO;
BOOL 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;
[htmlString release];
// base tag with font defaults
DTCoreTextFontDescriptor *defaultFontDescriptor = [[[DTCoreTextFontDescriptor alloc] initWithFontAttributes:nil] autorelease];
defaultFontDescriptor.pointSize = 12.0 * textScale;
NSString *defaultFontFamily = [options objectForKey:DTDefaultFontFamily];
if (defaultFontFamily)
{
defaultFontDescriptor.fontFamily = defaultFontFamily;
}
else
{
defaultFontDescriptor.fontFamily = @"Times New Roman";
}
id defaultLinkColor = [options objectForKey:DTDefaultLinkColor];
if (defaultLinkColor)
{
if ([defaultLinkColor isKindOfClass:[NSString class]])
{
// convert from string to color
defaultLinkColor = [UIColor colorWithHTMLName:defaultLinkColor];
}
}
else
{
defaultLinkColor = [UIColor colorWithHTMLName:@"#0000EE"];
}
// default is to have A underlined
BOOL defaultLinkDecoration = YES;
NSNumber *linkDecorationDefault = [options objectForKey:DTDefaultLinkDecoration];
if (linkDecorationDefault)
{
defaultLinkDecoration = [linkDecorationDefault boolValue];
}
// default paragraph style
DTCoreTextParagraphStyle *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.textAlignment = [defaultTextAlignmentNum integerValue];
}
NSNumber *defaultFirstLineHeadIndent = [options objectForKey:DTDefaultFirstLineHeadIndent];
if (defaultFirstLineHeadIndent)
{
defaultParagraphStyle.firstLineIndent = [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] autorelease];
defaultTag.fontDescriptor = defaultFontDescriptor;
defaultTag.paragraphStyle = defaultParagraphStyle;
defaultTag.textScale = textScale;
id defaultColor = [options objectForKey:DTDefaultTextColor];
if (defaultColor)
{
if ([defaultColor isKindOfClass:[UIColor class]])
{
// already a UIColor
defaultTag.textColor = defaultColor;
}
else
{
// need to convert first
defaultTag.textColor = [UIColor colorWithHTMLName:defaultColor];
}
}
DTHTMLElement *currentTag = defaultTag; // our defaults are the root
// skip initial whitespace
[scanner scanCharactersFromSet:[NSCharacterSet whitespaceAndNewlineCharacterSet] intoString:NULL];
// skip doctype tag
[scanner scanDOCTYPE:NULL];
// skip initial whitespace
[scanner scanCharactersFromSet:[NSCharacterSet whitespaceAndNewlineCharacterSet] intoString:NULL];
while (![scanner isAtEnd])
{
NSString *tagName = nil;
NSDictionary *tagAttributesDict = nil;
BOOL tagOpen = YES;
BOOL immediatelyClosed = NO;
if ([scanner scanHTMLTag:&tagName attributes:&tagAttributesDict isOpen:&tagOpen isClosed:&immediatelyClosed] && tagName)
{
if ([tagName isEqualToString:@"style"] && tagOpen)
{
// get contents, there cannot be anything contained in this block
NSString *tagContents = nil;
if ([scanner scanUpToString:@"<" intoString:&tagContents])
{
[styleSheet parseStyleBlock:tagContents];
}
continue;
}
if ([tagName isMetaTag])
{
continue;
}
if (tagOpen)
{
// make new tag as copy of previous tag
DTHTMLElement *parent = currentTag;
currentTag = [[currentTag copy] autorelease];
currentTag.tagName = tagName;
currentTag.textScale = textScale;
currentTag.attributes = tagAttributesDict;
[parent addChild:currentTag];
// apply style from merged style sheet
NSDictionary *mergedStyles = [styleSheet mergedStyleDictionaryForElement:currentTag];
if (mergedStyles)
{
[currentTag applyStyleDictionary:mergedStyles];
}
// convert CSS Styles into our own style
// NSString *styleString = [currentTag attributeForKey:@"style"];
//
// if (styleString)
// {
// [currentTag parseStyleString:styleString];
// }
if (![currentTag isInline] && !tagOpen && ![currentTag isMeta])
{
// next text needs a NL
needsNewLineBefore = YES;
}
// direction
NSString *direction = [currentTag attributeForKey:@"dir"];
if (direction)
{
NSString *lowerDirection = [direction lowercaseString];
if ([lowerDirection isEqualToString:@"ltr"])
{
currentTag.paragraphStyle.writingDirection = kCTWritingDirectionLeftToRight;
}
else if ([lowerDirection isEqualToString:@"rtl"])
{
currentTag.paragraphStyle.writingDirection = kCTWritingDirectionRightToLeft;
}
}
}
// ---------- Processing
if ([tagName isEqualToString:@"#COMMENT#"])
{
continue;
}
else if ([tagName isEqualToString:@"img"] && tagOpen)
{
immediatelyClosed = YES;
if (![currentTag.parent.tagName isEqualToString:@"p"])
{
needsNewLineBefore = YES;
}
// 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;
if (needsNewLineBefore)
{
if ([tmpString length] && ![[tmpString string] hasSuffix:@"\n"])
{
[tmpString appendNakedString:@"\n"];
}
needsNewLineBefore = NO;
}
// add it to output
[tmpString appendAttributedString:[currentTag attributedString]];
}
else if ([tagName isEqualToString:@"blockquote"] && tagOpen)
{
currentTag.paragraphStyle.headIndent += 25.0 * textScale;
currentTag.paragraphStyle.firstLineIndent = currentTag.paragraphStyle.headIndent;
currentTag.paragraphStyle.paragraphSpacing = defaultFontDescriptor.pointSize;
}
else if (([tagName isEqualToString:@"iframe"] || [tagName isEqualToString:@"video"] || [tagName isEqualToString:@"object"]) && tagOpen)
{
// 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;
// add it to output
[tmpString appendAttributedString:[currentTag attributedString]];
}
else if ([tagName isEqualToString:@"a"])
{
if (tagOpen)
{
if (defaultLinkDecoration)
{
currentTag.underlineStyle = kCTUnderlineStyleSingle;
}
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];
}
else
{
link = baseURL;
}
}
currentTag.link = link;
}
}
else if ([tagName isEqualToString:@"b"] || [tagName isEqualToString:@"strong"])
{
currentTag.fontDescriptor.boldTrait = YES;
}
else if ([tagName isEqualToString:@"i"] || [tagName isEqualToString:@"em"])
{
currentTag.fontDescriptor.italicTrait = YES;
}
else if ([tagName isEqualToString:@"li"])
{
if (tagOpen)
{
// have inherited the correct list counter from parent
DTHTMLElement *counterElement = currentTag.parent;
NSString *valueNum = [currentTag attributeForKey:@"value"];
if (valueNum)
{
NSInteger value = [valueNum integerValue];
counterElement.listCounter = value;
currentTag.listCounter = value;
}
counterElement.listCounter++;
needsListItemStart = YES;
currentTag.paragraphStyle.paragraphSpacing = 0;
currentTag.paragraphStyle.firstLineIndent = currentTag.paragraphStyle.headIndent;
currentTag.paragraphStyle.headIndent += currentTag.paragraphStyle.listIndent;
// first tab is to right-align bullet, numbering against
CGFloat tabOffset = currentTag.paragraphStyle.headIndent - 5.0*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];
}
else
{
needsListItemStart = NO;
}
}
else if ([tagName isEqualToString:@"left"])
{
if (tagOpen)
{
currentTag.paragraphStyle.textAlignment = kCTLeftTextAlignment;
}
}
else if ([tagName isEqualToString:@"center"] && tagOpen)
{
currentTag.paragraphStyle.textAlignment = kCTCenterTextAlignment;
}
else if ([tagName isEqualToString:@"right"] && tagOpen)
{
currentTag.paragraphStyle.textAlignment = kCTRightTextAlignment;
}
else if ([tagName isEqualToString:@"del"] || [tagName isEqualToString:@"strike"] )
{
if (tagOpen)
{
currentTag.strikeOut = YES;
}
}
else if ([tagName isEqualToString:@"ol"])
{
if (tagOpen)
{
NSString *valueNum = [currentTag attributeForKey:@"start"];
if (valueNum)
{
NSInteger value = [valueNum integerValue];
currentTag.listCounter = value;
}
else
{
currentTag.listCounter = 1;
}
needsNewLineBefore = YES;
}
else
{
#if ALLOW_IPHONE_SPECIAL_CASES
if (currentTag.listDepth < 1)
nextParagraphAdditionalSpaceBefore = defaultFontDescriptor.pointSize;
#endif
}
}
else if ([tagName isEqualToString:@"ul"])
{
if (tagOpen)
{
needsNewLineBefore = YES;
currentTag.listCounter = 0;
}
else
{
#if ALLOW_IPHONE_SPECIAL_CASES
if (currentTag.listDepth < 1)
nextParagraphAdditionalSpaceBefore = defaultFontDescriptor.pointSize;
#endif
}
}
else if ([tagName isEqualToString:@"u"])
{
if (tagOpen)
{
currentTag.underlineStyle = kCTUnderlineStyleSingle;
}
}
else if ([tagName isEqualToString:@"sup"])
{
if (tagOpen)
{
currentTag.superscriptStyle = 1;
currentTag.fontDescriptor.pointSize *= 0.83;
}
}
else if ([tagName isEqualToString:@"pre"] || [tagName isEqualToString:@"code"])
{
if (tagOpen)
{
currentTag.fontDescriptor.fontFamily = @"Courier";
currentTag.preserveNewlines = YES;
currentTag.paragraphStyle.textAlignment = kCTNaturalTextAlignment;
}
}
else if ([tagName isEqualToString:@"sub"])
{
if (tagOpen)
{
currentTag.superscriptStyle = -1;
currentTag.fontDescriptor.pointSize *= 0.83;
}
}
else if ([tagName isEqualToString:@"hr"])
{
if (tagOpen)
{
immediatelyClosed = YES;
// open block needs closing
if (needsNewLineBefore)
{
if ([tmpString length] && ![[tmpString string] hasSuffix:@"\n"])
{
[tmpString appendNakedString:@"\n"];
}
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:@"DTHorizontalRuleStyle"];
[tmpString appendAttributedString:[currentTag attributedString]];
}
}
else if ([tagName hasPrefix:@"h"])
{
if (tagOpen)
{
NSString *levelString = [tagName substringFromIndex:1];
NSInteger headerLevel = [levelString integerValue];
if (headerLevel)
{
currentTag.headerLevel = headerLevel;
currentTag.fontDescriptor.boldTrait = YES;
switch (headerLevel)
{
case 1:
{
// H1: 2 em, spacing before 0.67 em, after 0.67 em
currentTag.fontDescriptor.pointSize *= 2.0;
currentTag.paragraphStyle.paragraphSpacing = 0.67 * currentTag.fontDescriptor.pointSize;
break;
}
case 2:
{
// H2: 1.5 em, spacing before 0.83 em, after 0.83 em
currentTag.fontDescriptor.pointSize *= 1.5;
currentTag.paragraphStyle.paragraphSpacing = 0.83 * currentTag.fontDescriptor.pointSize;
break;
}
case 3:
{
// H3: 1.17 em, spacing before 1 em, after 1 em
currentTag.fontDescriptor.pointSize *= 1.17;
currentTag.paragraphStyle.paragraphSpacing = 1.0 * currentTag.fontDescriptor.pointSize;
break;
}
case 4:
{
// H4: 1 em, spacing before 1.33 em, after 1.33 em
currentTag.paragraphStyle.paragraphSpacing = 1.33 * currentTag.fontDescriptor.pointSize;
break;
}
case 5:
{
// H5: 0.83 em, spacing before 1.67 em, after 1.167 em
currentTag.fontDescriptor.pointSize *= 0.83;
currentTag.paragraphStyle.paragraphSpacing = 1.67 * currentTag.fontDescriptor.pointSize;
break;
}
case 6:
{
// H6: 0.67 em, spacing before 2.33 em, after 2.33 em
currentTag.fontDescriptor.pointSize *= 0.67;
currentTag.paragraphStyle.paragraphSpacing = 2.33 * currentTag.fontDescriptor.pointSize;
break;
}
default:
break;
}
}
}
}
else if ([tagName isEqualToString:@"big"])
{
if (tagOpen)
{
currentTag.fontDescriptor.pointSize *= 1.2;
}
}
else if ([tagName isEqualToString:@"small"])
{
if (tagOpen)
{
currentTag.fontDescriptor.pointSize /= 1.2;
}
}
else if ([tagName isEqualToString:@"font"])
{
if (tagOpen)
{
NSInteger size = [[currentTag attributeForKey:@"size"] intValue];
switch (size)
{
case 1:
currentTag.fontDescriptor.pointSize = textScale * 9.0;
break;
case 2:
currentTag.fontDescriptor.pointSize = textScale * 10.0;
break;
case 4:
currentTag.fontDescriptor.pointSize = textScale * 14.0;
break;
case 5:
currentTag.fontDescriptor.pointSize = textScale * 18.0;
break;
case 6:
currentTag.fontDescriptor.pointSize = textScale * 24.0;
break;
case 7:
currentTag.fontDescriptor.pointSize = textScale * 37.0;
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 = [UIColor colorWithHTMLName:color];
}
}
}
else if ([tagName isEqualToString:@"p"])
{
if (tagOpen)
{
currentTag.paragraphStyle.paragraphSpacing = defaultFontDescriptor.pointSize;
currentTag.paragraphStyle.firstLineIndent = currentTag.paragraphStyle.headIndent + defaultParagraphStyle.firstLineIndent;
}
}
else if ([tagName isEqualToString:@"br"])
{
immediatelyClosed = YES;
currentTag.text = UNICODE_LINE_FEED;
[tmpString appendAttributedString:[currentTag attributedString]];
}
// --------------------- push tag on stack if it's opening
if (tagOpen&&immediatelyClosed)
{
DTHTMLElement *popChild = currentTag;
currentTag = currentTag.parent;
[currentTag removeChild:popChild];
}
else if (!tagOpen)
{
// block items have to have a NL at the end.
if (![currentTag isInline] && ![currentTag isMeta] && ![[tmpString string] hasSuffix:@"\n"] /* && ![[tmpString string] hasSuffix:UNICODE_OBJECT_PLACEHOLDER] */)
{
if ([tmpString length])
{
[tmpString appendString:@"\n"]; // extends attributed area at end
}
else
{
currentTag.text = @"\n";
[tmpString appendAttributedString:[currentTag attributedString]];
}
}
// check if this tag is indeed closing the currently open one
if ([tagName isEqualToString:currentTag.tagName])
{
DTHTMLElement *popChild = currentTag;
currentTag = currentTag.parent;
[currentTag removeChild:popChild];
}
else
{
// Ignoring non-open tag
}
}
else if (immediatelyClosed)
{
// If it's immediately closed it's not relevant for following body
// currentTag = [tagStack lastObject];
}
}
else
{
//----------------------------------------- TAG CONTENTS -----------------------------------------
NSString *tagContents = nil;
// if we find a < at this stage then we can assume it was a malformed tag, need to skip it to prevent endless loop
BOOL skippedAngleBracket = NO;
if ([scanner scanString:@"<" intoString:NULL])
{
skippedAngleBracket = YES;
}
if ((skippedAngleBracket||[scanner scanUpToString:@"<" intoString:&tagContents]) && !currentTag.tagContentInvisible)
{
if (skippedAngleBracket)
{
if (tagContents)
{
tagContents = [@"<" stringByAppendingString:tagContents];
}
else
{
tagContents = @"<";
}
}
if ([[tagContents stringByTrimmingCharactersInSet:[NSCharacterSet newlineCharacterSet]] length])
{
if (currentTag.preserveNewlines)
{
tagContents = [tagContents stringByReplacingOccurrencesOfString:@"\n" withString:UNICODE_LINE_FEED];
}
else
{
tagContents = [tagContents stringByNormalizingWhitespace];
}
tagContents = [tagContents stringByReplacingHTMLEntities];
tagName = currentTag.tagName;
#if ALLOW_IPHONE_SPECIAL_CASES
if (tagOpen && ![currentTag isInline] && ![tagName isEqualToString:@"li"])
{
if (nextParagraphAdditionalSpaceBefore>0)
{
// FIXME: add extra space properly
// this also works, but breaks UnitTest for lists
tagContents = [UNICODE_LINE_FEED stringByAppendingString:tagContents];
// this causes problems on the paragraph after a List
//paragraphSpacingBefore += nextParagraphAdditionalSpaceBefore;
nextParagraphAdditionalSpaceBefore = 0;
}
}
#endif
if (needsNewLineBefore)
{
if ([tagContents hasPrefix:@" "])
{
tagContents = [tagContents substringFromIndex:1];
}
if ([tmpString length])
{
if (![[tmpString string] hasSuffix:@"\n"])
{
[tmpString appendNakedString:@"\n"];
}
}
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:@" "])
{
NSAttributedString *prefixString = [currentTag prefixForListItem];
if (prefixString)
{
[tmpString appendAttributedString:prefixString];
}
needsListItemStart = NO;
}
// we don't want whitespace before first tag to turn into paragraphs
if (![currentTag isMeta])
{
currentTag.text = tagContents;
[tmpString appendAttributedString:[currentTag attributedString]];
}
}
}
}
}
// returning the temporary mutable string is faster
//return [self initWithAttributedString:tmpString];
[self release];
return tmpString;
}
#pragma mark Convenience Methods
+ (NSAttributedString *)attributedStringWithHTML:(NSData *)data options:(NSDictionary *)options
{
NSAttributedString *attrString = [[[NSAttributedString alloc] initWithHTML:data options:options documentAttributes:NULL] autorelease];
return attrString;
}
#pragma mark Utlities
+ (NSAttributedString *)synthesizedSmallCapsAttributedStringWithText:(NSString *)text attributes:(NSDictionary *)attributes
{
CTFontRef normalFont = (CTFontRef)[attributes objectForKey:(id)kCTFontAttributeName];
DTCoreTextFontDescriptor *smallerFontDesc = [DTCoreTextFontDescriptor fontDescriptorForCTFont:normalFont];
smallerFontDesc.pointSize *= 0.7;
CTFontRef smallerFont = [smallerFontDesc newMatchingFont];
NSMutableDictionary *smallAttributes = [attributes mutableCopy];
[smallAttributes setObject:(id)smallerFont forKey:(id)kCTFontAttributeName];
CFRelease(smallerFont);
NSMutableAttributedString *tmpString = [[NSMutableAttributedString alloc] init];
NSScanner *scanner = [NSScanner scannerWithString:text];
[scanner setCharactersToBeSkipped:nil];
NSCharacterSet *lowerCaseChars = [NSCharacterSet lowercaseLetterCharacterSet];
while (![scanner isAtEnd])
{
NSString *part;
if ([scanner scanCharactersFromSet:lowerCaseChars intoString:&part])
{
part = [part uppercaseString];
NSAttributedString *partString = [[NSAttributedString alloc] initWithString:part attributes:smallAttributes];
[tmpString appendAttributedString:partString];
[partString release];
}
if ([scanner scanUpToCharactersFromSet:lowerCaseChars intoString:&part])
{
NSAttributedString *partString = [[NSAttributedString alloc] initWithString:part attributes:attributes];
[tmpString appendAttributedString:partString];
[partString release];
}
}
[smallAttributes release];
return [tmpString autorelease];
}
- (NSArray *)textAttachmentsWithPredicate:(NSPredicate *)predicate
{
NSMutableArray *tmpArray = [NSMutableArray array];
NSUInteger index = 0;
while (index<[self length])
{
NSRange range;
NSDictionary *attributes = [self attributesAtIndex:index effectiveRange:&range];
DTTextAttachment *attachment = [attributes objectForKey:@"DTTextAttachment"];
if (attachment)
{
if ([predicate evaluateWithObject:attachment])
{
[tmpArray addObject:attachment];
}
}
index += range.length;
}
if ([tmpArray count])
{
return tmpArray;
}
return nil;
}
#pragma mark HTML Encoding
// TO DO: aggregate common styles (like font) into one span
// TO DO: correctly encode LI/OL/UL
// TO DO: correctly encode shadows
- (NSString *)htmlString
{
NSString *plainString = [self string];
// divide the string into it's blocks, we assume that these are the P
NSArray *paragraphs = [plainString componentsSeparatedByString:@"\n"];
NSMutableString *retString = [NSMutableString string];
NSInteger location = 0;