add support for css files reference in html

Core/Source/DTHTMLAttributedStringBuilder.m

@@ -612,6 +612,28 @@ - (void)_registerTagEndHandlers
 	};
 
 	[_tagEndHandlers setObject:[styleBlock copy] forKey:@"style"];
+
+
+	void (^linkBlock)(void) = ^
+	{
+		NSString *href = [_currentTag attributeForKey:@"href"];
+		NSString *type = [[_currentTag attributeForKey:@"type"] lowercaseString];
+		if ([type isEqualToString:@"text/css"]) {
+			NSURL *stylesheetURL = [NSURL URLWithString:href relativeToURL:_baseURL];
+			if ([stylesheetURL isFileURL]) {
+				NSString *stylesheetContent = [NSString stringWithContentsOfURL:stylesheetURL encoding:NSUTF8StringEncoding error:nil];
+				if (stylesheetContent) {
+					DTCSSStylesheet *localSheet = [[DTCSSStylesheet alloc] initWithStyleBlock:stylesheetContent];
+					[_globalStyleSheet mergeStylesheet:localSheet];
+				}
+			}
+			else {
+				NSLog(@"WARNING: css link referencing a non-local target, ignored");
+			}
+		}
+	};
+
+	[ _tagEndHandlers setObject:[linkBlock copy] forKey:@"link"];
 }
 
 #pragma mark DTHTMLParser Delegate

DTCoreText.xcodeproj/project.pbxproj

@@ -500,6 +500,7 @@
 		A7F7EFC61573603100F5A4D0 /* DTImage+HTML.h in Headers */ = {isa = PBXBuildFile; fileRef = A7C5D01314D7E3BB00AF1D75 /* DTImage+HTML.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		A7F7EFC81573603100F5A4D0 /* DTCompatibility.h in Headers */ = {isa = PBXBuildFile; fileRef = A7A672B91532F2D100920A18 /* DTCompatibility.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		A7F842F416D38BC300BCD63F /* FontSizes.html in Resources */ = {isa = PBXBuildFile; fileRef = A7EB84FB168ED63A00D686B7 /* FontSizes.html */; };
+		DDCCEB1E17005A4F009FF923 /* css.css in Resources */ = {isa = PBXBuildFile; fileRef = DDCCEB1D17005A4F009FF923 /* css.css */; };
 		DE08BAB5148808B20054DC84 /* DTCoreTextFontOverrides.plist in Resources */ = {isa = PBXBuildFile; fileRef = A788CA2114863EF100E1AFD9 /* DTCoreTextFontOverrides.plist */; };
 		E2262DC71638331500BFDAD7 /* Cocoa.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = A7F5671C14D8469000D1F167 /* Cocoa.framework */; };
 		E2262DD51638336700BFDAD7 /* DTColor+HTML.m in Sources */ = {isa = PBXBuildFile; fileRef = A788C95314863E8700E1AFD9 /* DTColor+HTML.m */; };
@@ -968,6 +969,7 @@
 		A7F5672514D8506B00D1F167 /* NSAttributedString+SmallCaps.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "NSAttributedString+SmallCaps.h"; sourceTree = "<group>"; };
 		A7F5672614D8506C00D1F167 /* NSAttributedString+SmallCaps.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = "NSAttributedString+SmallCaps.m"; sourceTree = "<group>"; };
 		A7F7EFCD1573603100F5A4D0 /* libDTCoreText_no_DTFoundation.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; includeInIndex = 0; path = libDTCoreText_no_DTFoundation.a; sourceTree = BUILT_PRODUCTS_DIR; };
+		DDCCEB1D17005A4F009FF923 /* css.css */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.css; path = css.css; sourceTree = "<group>"; };
 		E2262DC61638331500BFDAD7 /* DTCoreText.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = DTCoreText.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 /* End PBXFileReference section */
 
@@ -1269,6 +1271,7 @@
 				A73885A41606E9B2001D60C4 /* EmojiTest.html */,
 				A730BCD616D29588003B849F /* Languages.html */,
 				A740369016E51C9800ECCDE0 /* About.html */,
+				DDCCEB1D17005A4F009FF923 /* css.css */,
 			);
 			path = Resources;
 			sourceTree = "<group>";
@@ -1970,6 +1973,7 @@
 				A7CF230A16DE1DF7005A4A6E /* AppledocSettings.plist in Resources */,
 				A740368916E51B3A00ECCDE0 /* DemoAboutViewController.xib in Resources */,
 				A740369116E51C9800ECCDE0 /* About.html in Resources */,
+				DDCCEB1E17005A4F009FF923 /* css.css in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

Demo/Resources/css.css

@@ -0,0 +1,28 @@
+		h1{
+			margin: 0px;
+			direction:rtl;
+			text-align:right;
+		}
+		.s2{
+			color: #000000;
+			font-size: 68.7500%;
+			font-style: normal;
+			font-variant: normal;
+			font-weight: normal;
+			letter-spacing: 0.0000em;
+			margin-bottom: 2.3148%;
+			margin-top: 0.0000%;
+			padding-left: 0.0000%;
+			padding-right: 0.0000%;
+			text-align: left;
+			text-decoration: none;
+			text-indent: 0.0000%;
+			text-transform: none;
+		}
+		.s18{
+			font-size: 81.2500%;
+			text-align: center;
+		}
+		.c10{
+			background: #FFFFFF;
+		}

Demo/Resources/styles.html

@@ -1,3 +1,8 @@
+<html>
+<head>
+<link rel="stylesheet" href="css.css" type="text/css"/>
+</head>
+<body>
 <h1>CSS Styles Support</h1>
 <p>Currently CSS styling is supported inline in tags, and via simple rules.</p>
 <p>For example:</p>
@@ -51,3 +56,8 @@ <h2>To Do</h2>
 <li>More robust mapping of font family to available fonts, support for fallback</li>
 <li>text-decoration - blink, overline</li>
 <li>font-variant - to support smallcaps</li></ul>
+
+<h1 class="s2 s18"><span class="c10">This text should be centered</span></h1>
+
+</body>
+</html>

Demo/Source/DemoTextViewController.m

@@ -161,6 +161,8 @@ - (NSAttributedString *)_attributedStringForSnippetUsingiOS6Attributes:(BOOL)use
 		[options setObject:[NSNumber numberWithBool:YES] forKey:DTUseiOS6Attributes];
 	}
 
+	[options setObject:[NSURL fileURLWithPath:readmePath] forKey:NSBaseURLDocumentOption];
+
 	NSAttributedString *string = [[NSAttributedString alloc] initWithHTMLData:data options:options documentAttributes:NULL];
 
 	return string;