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slightly more efficient line conversion

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a dinosaur
2024-11-12 21:34:06 +11:00
parent aff578b9a6
commit ea5dd3771b
1 changed files with 5 additions and 8 deletions
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13
Sources/apk/Utility/TextInputStream.swift
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@ -29,7 +29,7 @@ struct TextInputStream<InStream: InputStream> where InStream.Element == UInt8 {
private var _stream: InStream private var _stream: InStream
private var _utf8Decoder = UTF8() private var _utf8Decoder = UTF8()
private var _scalars = [Unicode.Scalar]() private var _string = String()
private var _lastChar: UnicodeScalar = "\0" private var _lastChar: UnicodeScalar = "\0"
private var _eof = false private var _eof = false
@ -43,7 +43,7 @@ struct TextInputStream<InStream: InputStream> where InStream.Element == UInt8 {
} else if value == "\r" { } else if value == "\r" {
break Decode break Decode
} }
self._scalars.append(value) self._string.unicodeScalars.append(value)
self._lastChar = value self._lastChar = value
case .emptyInput: case .emptyInput:
self._eof = true self._eof = true
@ -66,18 +66,15 @@ struct TextInputStream<InStream: InputStream> where InStream.Element == UInt8 {
// Decode a line of scalars // Decode a line of scalars
self.decodeScalarsLine() self.decodeScalarsLine()
defer { defer {
self._scalars.removeAll(keepingCapacity: true) self._string.removeAll(keepingCapacity: true)
} }
// Ignore the final empty newline // Ignore the final empty newline
guard !self._eof || !self._scalars.isEmpty else { guard !self._eof || !self._string.isEmpty else {
return nil return nil
} }
// Convert to string and return return self._string
var string = String()
string.unicodeScalars.append(contentsOf: self._scalars)
return string
} }
} }