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[String] Fast paths for hasPrefix and hasSuffix #865

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Merged
merged 1 commit into from
Feb 8, 2017
Merged

[String] Fast paths for hasPrefix and hasSuffix #865

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24 changes: 12 additions & 12 deletions Foundation/NSString.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -1428,29 +1428,29 @@ extension String : _NSBridgeable, _CFBridgeable {
#if !(os(OSX) || os(iOS))
extension String {
public func hasPrefix(_ prefix: String) -> Bool {
if prefix.isEmpty {
return true
}

let cfstring = self._cfObject
let range = CFRangeMake(0, CFStringGetLength(cfstring))
let opts = CFStringCompareFlags(
kCFCompareAnchored | kCFCompareNonliteral)
if prefix.isEmpty {
return true
} else {
return CFStringFindWithOptions(cfstring, prefix._cfObject,
range, opts, nil)
}
return CFStringFindWithOptions(cfstring, prefix._cfObject,
range, opts, nil)
}

public func hasSuffix(_ suffix: String) -> Bool {
if suffix.isEmpty {
return true
}

let cfstring = self._cfObject
let range = CFRangeMake(0, CFStringGetLength(cfstring))
let opts = CFStringCompareFlags(
kCFCompareAnchored | kCFCompareBackwards | kCFCompareNonliteral)
if suffix.isEmpty {
return true
} else {
return CFStringFindWithOptions(cfstring, suffix._cfObject,
range, opts, nil)
}
return CFStringFindWithOptions(cfstring, suffix._cfObject,
range, opts, nil)
}
}
#endif
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