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KeyHandler // Deprecating NSString in buildInputtingState().

This commit is contained in:
ShikiSuen 2022-05-12 22:38:24 +08:00
parent f445462026
commit 164e8d7b32
1 changed files with 40 additions and 38 deletions
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78
Source/Modules/ControllerModules/KeyHandler_States.swift
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@ -37,58 +37,60 @@ extension KeyHandler {
var composingBuffer = ""
var composedStringCursorIndex = 0
var readingCursorIndex: size_t = 0
let builderCursorIndex: size_t = getBuilderCursorIndex()
var readingCursorIndex = 0
let builderCursorIndex = getBuilderCursorIndex()
// We must do some Unicode codepoint counting to find the actual cursor location for the client
// i.e. we need to take UTF-16 into consideration, for which a surrogate pair takes 2 UniChars
// locations. These processes are inherited from the ObjC++ version of this class and might be
// unnecessary in Swift, but this deduction requires further experiments.
for walkedNode in _walkedNodes {
if let theNode = walkedNode.node {
let strNodeValue = theNode.currentKeyValue().value
composingBuffer += strNodeValue
for theAnchor in _walkedNodes {
guard let node = theAnchor.node else {
continue
}
let arrSplit: [NSString] = (strNodeValue as NSString).split()
let codepointCount = arrSplit.count
let valueString = node.currentKeyValue().value
composingBuffer += valueString
let codepointCount = valueString.count
// This re-aligns the cursor index in the composed string
// (the actual cursor on the screen) with the builder's logical
// cursor (reading) cursor; each built node has a "spanning length"
// (e.g. two reading blocks has a spanning length of 2), and we
// accumulate those lengths to calculate the displayed cursor
// index.
let spanningLength: Int = walkedNode.spanningLength
if readingCursorIndex + spanningLength <= builderCursorIndex {
composedStringCursorIndex += (strNodeValue as NSString).length
readingCursorIndex += spanningLength
} else {
if codepointCount == spanningLength {
var i = 0
while i < codepointCount, readingCursorIndex < builderCursorIndex {
composedStringCursorIndex += arrSplit[i].length
readingCursorIndex += 1
i += 1
}
} else {
let spanningLength = theAnchor.spanningLength
if readingCursorIndex + spanningLength <= builderCursorIndex {
composedStringCursorIndex += valueString.count
readingCursorIndex += spanningLength
} else {
if codepointCount == spanningLength {
for _ in 0..<codepointCount {
if readingCursorIndex < builderCursorIndex {
composedStringCursorIndex += (strNodeValue as NSString).length
readingCursorIndex += spanningLength
if readingCursorIndex > builderCursorIndex {
readingCursorIndex = builderCursorIndex
}
composedStringCursorIndex += 1
readingCursorIndex += 1
}
}
} else {
if readingCursorIndex < builderCursorIndex {
composedStringCursorIndex += valueString.count
readingCursorIndex += spanningLength
if readingCursorIndex > builderCursorIndex {
readingCursorIndex = builderCursorIndex
}
}
}
}
}
// Now, we gather all the intel, separate the composing buffer to two parts (head and tail),
// and insert the reading text (the Mandarin syllable) in between them.
// The reading text is what the user is typing.
let head = String((composingBuffer as NSString).substring(to: composedStringCursorIndex))
var rawHead = ""
var rawEnd = ""
for (i, n) in composingBuffer.enumerated() {
if i < composedStringCursorIndex {
rawHead += String(n)
} else {
rawEnd += String(n)
}
}
let head = rawHead
let reading = _composer.getDisplayedComposition()
let tail = String((composingBuffer as NSString).substring(from: composedStringCursorIndex))
let tail = rawEnd
let composedText = head + reading + tail
let cursorIndex = composedStringCursorIndex + reading.count