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30 changes: 30 additions & 0 deletions
30
Aztec/Classes/Extensions/NSAttributedString+Analyzers.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| import Foundation | ||
| import UIKit | ||
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| // MARK: - NSAttributedString Analyzer Helpers | ||
| // | ||
| extension NSAttributedString { | ||
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| /// Returns true if the text preceding a given location contains the NSLinkAttribute. | ||
| /// | ||
| func isLocationPreceededByLink(_ location: Int) -> Bool { | ||
| let beforeRange = NSRange(location: location - 1, length: 1) | ||
| guard beforeRange.location >= 0 else { | ||
| return false | ||
| } | ||
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| return attribute(NSLinkAttributeName, at: beforeRange.location, effectiveRange: nil) != nil | ||
| } | ||
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| /// Returns true if the text immediately succeding a given location contains the NSLinkAttribute. | ||
| /// | ||
| func isLocationSuccededByLink(_ location: Int) -> Bool { | ||
| let afterRange = NSRange(location: location, length: 1) | ||
| guard afterRange.endLocation < length else { | ||
| return false | ||
| } | ||
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| return attribute(NSLinkAttributeName, at: afterRange.location, effectiveRange: nil) != nil | ||
| } | ||
| } |
38 changes: 38 additions & 0 deletions
38
Aztec/Classes/Extensions/NSAttributedString+AttributeDifferences.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| import Foundation | ||
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| extension NSAttributedString { | ||
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| typealias ProcessDifferenceClosure = (NSRange, String, Any?, Any?) -> () | ||
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| func enumerateAttributeDifferences( | ||
| in range: NSRange, | ||
| against targetAttributes: [String : Any], | ||
| do processDifference: ProcessDifferenceClosure) { | ||
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| enumerateAttributes(in: range, options: [], using: { (attributes, subRange, stop) in | ||
| NSAttributedString.enumerateAttributeDifferences( | ||
| in: subRange, | ||
| sourceAttributes: attributes, | ||
| targetAttributes: targetAttributes, | ||
| do: processDifference) | ||
| }) | ||
| } | ||
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| static func enumerateAttributeDifferences( | ||
| in range: NSRange, | ||
| sourceAttributes: [String : Any], | ||
| targetAttributes: [String : Any], | ||
| do processDifference: ProcessDifferenceClosure) { | ||
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| let sourceKeys = Set(sourceAttributes.keys) | ||
| let targetKeys = Set(targetAttributes.keys) | ||
| let joinedKeys = sourceKeys.union(targetKeys) | ||
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| for key in joinedKeys { | ||
| let sourceValue = sourceAttributes.contains(where: { return $0.key == key }) ? sourceAttributes[key] : nil | ||
| let targetValue = targetAttributes.contains(where: { return $0.key == key }) ? targetAttributes[key] : nil | ||
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| processDifference(range, key, sourceValue, targetValue) | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,20 +1,52 @@ | ||
| import Foundation | ||
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| // MARK: - String Extensions | ||
| // MARK: - String NSRange and Location convertion Extensions | ||
| // | ||
| extension String | ||
| { | ||
| func rangeFromNSRange(_ nsRange : NSRange) -> Range<String.Index>? { | ||
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| let rangeStartIndex = utf16.startIndex.advanced(by: nsRange.location) | ||
| let rangeEndIndex = rangeStartIndex.advanced(by: nsRange.length) | ||
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| if let from = String.Index(rangeStartIndex, within: self), | ||
| let to = String.Index(rangeEndIndex, within: self) { | ||
| return from ..< to | ||
| let from16 = utf16.index(utf16.startIndex, offsetBy: nsRange.location) | ||
| let to16 = utf16.index(from16, offsetBy: nsRange.length) | ||
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| guard | ||
| let from = from16.samePosition(in: self), | ||
| let to = to16.samePosition(in: self) | ||
| else { return nil } | ||
| return from ..< to | ||
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| } | ||
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| func indexFromLocation(_ location: Int) -> String.Index? { | ||
| guard | ||
| let from16 = utf16.index(utf16.startIndex, offsetBy: location, limitedBy: utf16.endIndex), | ||
| let from = from16.samePosition(in: self) | ||
| else { return nil } | ||
| return from | ||
| } | ||
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| func isLastValidLocation(_ location: Int) -> Bool { | ||
| if self.isEmpty { | ||
| return false | ||
| } | ||
| return index(before: endIndex) == indexFromLocation(location) | ||
| } | ||
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| func location(after: Int) -> Int? { | ||
| guard let currentIndex = indexFromLocation(after) else { | ||
| return nil | ||
| } | ||
| let afterIndex = index(after: currentIndex) | ||
| let after16 = afterIndex.samePosition(in: utf16) | ||
| return utf16.distance(from: utf16.startIndex, to: after16) | ||
| } | ||
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| func location(before: Int) -> Int? { | ||
| guard let currentIndex = indexFromLocation(before) else { | ||
| return nil | ||
| } | ||
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| return nil | ||
| let beforeIndex = index(before: currentIndex) | ||
| let before16 = beforeIndex.samePosition(in: utf16) | ||
| return utf16.distance(from: utf16.startIndex, to: before16) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| import Foundation | ||
| import UIKit | ||
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| // MARK: - UIFont Emoji Helpers | ||
| // | ||
| extension UIFont { | ||
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| /// Indicates if the current font instance matches with iOS's Internal Emoji Font, or not. | ||
| /// | ||
| var isAppleEmojiFont: Bool { | ||
| return fontName == ".AppleColorEmojiUI" | ||
| } | ||
| } |
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