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Added CSSSelector and added tree building code
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Sam Stewart
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Jul 17, 2011
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| @implementation CSSParser | ||
| @synthesize delegate; | ||
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| - (void)dealloc { | ||
| [super dealloc]; | ||
| } | ||
| @end | ||
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| } | ||
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| @end | ||
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| // | ||
| // CSSRuleset.h | ||
| // CSSSample | ||
| // | ||
| // Created by Sam Stewart on 7/16/11. | ||
| // Copyright 2011 Float:Right Ltd. All rights reserved. | ||
| // | ||
| /** This class represents a single CSS ruleset. It allows us to load | ||
| resources and provids a storage container for a given ruleset. | ||
| For example, this class represents the rule section of a selector group. | ||
| { | ||
| background-image: url('test.jpg'); | ||
| color: #FFFFFF | ||
| } | ||
| This class does lazy loading of resources so it only loads when you call getRuleValue. If it doesn't have the resource | ||
| cached it will load and cache it. | ||
| */ | ||
| #import <Foundation/Foundation.h> | ||
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| @interface CSSRuleset : NSObject { | ||
| // string rep of the ruleset | ||
| NSDictionary *parsedRuleset; | ||
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| // dictionary with actual loaded resources (like UIImage) | ||
| // this thing acts as a cache. | ||
| NSDictionary *loadedRuleset; | ||
| } | ||
| - (id)initWithDict:(NSDictionary*)dictionary; | ||
| /** Grabs the rule value for the specified key. It'll load the resource if it doesn't | ||
| already exist.*/ | ||
| - (NSObject*)getRuleValue:(NSString*)key; | ||
| /** Sets the resource uri (like background-image for css) for the specified ruleset key.*/ | ||
| - (void)setRuleValue:(NSString*)value forKey:(NSString*)key; | ||
| @end |
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| // | ||
| // CSSRuleset.m | ||
| // CSSSample | ||
| // | ||
| // Created by Sam Stewart on 7/16/11. | ||
| // Copyright 2011 Float:Right Ltd. All rights reserved. | ||
| // | ||
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| #import "CSSRuleset.h" | ||
| @interface CSSRuleset() | ||
| - (NSObject*)loadResource:(NSString*)resource_uri; | ||
| @end | ||
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| @implementation CSSRuleset | ||
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| - (id)initWithDict:(NSDictionary *)dictionary { | ||
| self = [super init]; | ||
| if (self) { | ||
| parsedRuleset = [dictionary retain]; | ||
| } | ||
| return self; | ||
| } | ||
| - (NSObject*)getRuleValue:(NSString *)key { | ||
| NSObject *value = [loadedRuleset objectForKey:key]; | ||
| if (!value) { | ||
| // since not in cache grab string uri and load | ||
| value = [self loadResource:[parsedRuleset objectForKey:key]]; | ||
| [loadedRuleset setValue:value forKey:key]; // save for next time. | ||
| } | ||
| return value; | ||
| } | ||
| - (void)setRuleValue:(NSObject *)value forKey:(NSString *)key { | ||
| [parsedRuleset setValue:value forKey:key]; | ||
| } | ||
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| - (void)dealloc { | ||
| [super dealloc]; | ||
| [parsedRuleset release], parsedRuleset = nil; | ||
| [loadedRuleset release], loadedRuleset = nil; | ||
| } | ||
| @end |
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| @@ -0,0 +1,33 @@ | ||
| // | ||
| // CSSSelector.h | ||
| // CSSSample | ||
| // | ||
| // Created by Sam Stewart on 7/16/11. | ||
| // Copyright 2011 Float:Right Ltd. All rights reserved. | ||
| // | ||
| /** | ||
| This class represents a css selector. Each selector is a bit like a uri with the ending element called | ||
| a "slug". For example, in the css selector "ul.red#hello" "#hello" would be the slug. | ||
| You can get the entire selector by calling "description" on this. | ||
| This is a simple wrapper class which allows us to manage selectors.*/ | ||
| #import <Foundation/Foundation.h> | ||
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| @interface CSSSelector : NSObject { | ||
| // the ending component | ||
| NSString *slug; | ||
| // the main selector (without slug) | ||
| NSString *main; | ||
| } | ||
| - (id)initWithSelector:(NSString*)selector; | ||
| /** Returns the components of the the selector (including the slug). | ||
| The components which are separated by spaces (mainly descendant selectors). | ||
| */ | ||
| - (NSArray*)selectorComponents; | ||
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| //not the best idea to update these directly. | ||
| @property (nonatomic, retain) NSString *main; | ||
| @property (nonatomic, retain) NSString *slug; | ||
| @end |
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| // | ||
| // CSSSelector.m | ||
| // CSSSample | ||
| // | ||
| // Created by Sam Stewart on 7/16/11. | ||
| // Copyright 2011 Float:Right Ltd. All rights reserved. | ||
| // | ||
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| #import "CSSSelector.h" | ||
| @interface CSSSelector () | ||
| - (void)breakIntoSlugAndMain:(NSString*)selector; | ||
| @end | ||
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| @implementation CSSSelector | ||
| @synthesize main, slug; | ||
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| - (id)initWithSelector:(NSString *)selector { | ||
| self = [super init]; | ||
| if (self) { | ||
| [self breakIntoSlugAndMain:selector]; | ||
| } | ||
| return self; | ||
| } | ||
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| /** Breaks into main url and slug.*/ | ||
| - (void)breakIntoSlugAndMain:(NSString*)selector { | ||
| // find slug (start at the end of the string and stop when we find control character) | ||
| unichar control_chars[5] = {'.', '#', ' ', '>', ':'}; | ||
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| for (int i = [selector length]; i>=0; i--) { | ||
| unichar cur_char = [selector characterAtIndex:i]; | ||
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| for (int j = 0; j<5;i++) { | ||
| if (cur_char == control_chars[j]) { | ||
| NSRange range = NSMakeRange(i-1, i+j+1); | ||
| self.slug = [selector substringWithRange:range]; | ||
| self.main = [selector substringToIndex:i]; | ||
| return; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| - (NSArray*)selectorComponents { | ||
| // just split on spaces.. | ||
| return [[self description] componentsSeparatedByString:@" "]; | ||
| } | ||
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| - (NSString*)description { | ||
| return [NSString stringWithFormat:@"%@%@", main, slug]; | ||
| } | ||
| - (void)dealloc { | ||
| [super dealloc]; | ||
| [main release], main = nil; | ||
| [slug release], slug = nil; | ||
| } | ||
| @end |
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| Original file line number | Diff line number | Diff line change |
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| // | ||
| // CSSStyleSheet.h | ||
| // CSSSample | ||
| // | ||
| // Created by Sam Stewart on 7/16/11. | ||
| // Copyright 2011 Float:Right Ltd. All rights reserved. | ||
| // | ||
| /** | ||
| Represents css style sheet which has been parsed and loaded into our custom format. | ||
| Each rule is represented backwards. For example you might have div.red#hello which would turn into | ||
| #hello -> .red -> div | ||
| Most specific to least specific. This setup allows us to ensure the correct properties take precendence. | ||
| Thus, each entry (like #hello) has is a dictionary with a a few built in keys. We always have: | ||
| 1. score | ||
| 2. All (is a default ruleset in case we don't have any parent selectors). For example, #hello would have an "All" key. | ||
| All is usually an instance of CSSRuleset since it's a toplevel namespace. | ||
| 3. any other selectors that are up a level. (for example, we'd have .red) | ||
| This structure continues all the way up the tree. | ||
| */ | ||
| #import <Foundation/Foundation.h> | ||
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| @class CSSParser; | ||
| @class CSSSelector; | ||
| @interface CSSStyleSheet : NSObject { | ||
| // main css style tree. Custom format. | ||
| NSMutableDictionary *mainTree; | ||
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| CSSParser *parser; | ||
| } | ||
| - (NSDictionary*)lookup:(CSSSelector*)selector; | ||
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| - (void)loadFromURL:(NSURL*)url; | ||
| - (void)loadFromString:(NSString*)css_code; | ||
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| + (CSSStyleSheet*)styleSheetFromURL:(NSURL*)url; | ||
| + (CSSStyleSheet*)styleSheetFromString:(NSString*)css_code; | ||
| @end |
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