Shuery
8a0924330a
整个 TUI 的地基：位置、对齐、边框都靠它。而它算错了**不会报错** —— 表现只是菜单右边框歪一点、光标偏一列，所以每条边界都在断言里钉住。 为什么必须自己算：.Length 是 UTF-16 code unit 的个数（汉字 1 个 char、2 列）；而 $Host.UI.RawUI.LengthInBufferCells 在 PowerShell 7 上对、在 5.1 上错（实测 中文 返回 2、字体边框字符 返回 6），且不抛错 —— 这种"一边对一边错"的 API 比两边都错更危险。 表里三个边界是实测踩过的：半角片假名 U+FF61–FF9F 是 1 列（不能划进全角区）；全角拉丁 U+FF00–FF60 是 2 列；emoji 是代理对，按一个码点算。 验收：断言 8 条（含空串与控制字符）；test.ps1 9/9 全绿（5.1 与 7）。
61 lines
4.1 KiB
PowerShell
61 lines
4.1 KiB
PowerShell
param([Parameter(Mandatory=$true)][string]$HostLabel, [Parameter(Mandatory=$true)][string]$OutFile, [int]$WatchSeconds = 2)
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$lines = New-Object System.Collections.Generic.List[string]
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function L($s) { $lines.Add($s) }
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$zh = [string]::Concat([char]0x4E2D, [char]0x6587)
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$zh2 = [string]::Concat([char]0x4E2D, [char]0x6587, [char]0x5907, [char]0x4EFD)
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$ascii8 = '12345678'
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$emoji = [string]::Concat([char]::ConvertFromUtf32(0x1F600))
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$box = [string]::Concat([char]0x250C, [char]0x2500, [char]0x2510)
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$boxOdd = [string]::Concat([char]0x250C, [char]0x2502, [char]0x2510)
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L "===== Chinese / fullwidth width measurement [$HostLabel] ====="
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L ("PSVersion : " + $PSVersionTable.PSVersion)
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L ("Console.WindowWidth : " + [Console]::WindowWidth)
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L ("Console.BufferWidth : " + [Console]::BufferWidth)
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try { L ("RawUI.WindowSize : " + $Host.UI.RawUI.WindowSize.Width + 'x' + $Host.UI.RawUI.WindowSize.Height) } catch { L ("RawUI.WindowSize THREW: " + $_.Exception.Message) }
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L ("Console.OutputEncoding : " + [Console]::OutputEncoding.WebName)
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L ("IsOutputRedirected : " + [Console]::IsOutputRedirected)
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L ""
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L ".Length (CHARACTER COUNT) vs REAL COLUMNS:"
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foreach ($item in @(@('ascii 8 chars ', $ascii8), @('Chinese 2 chars', $zh), @('Chinese 4 chars', $zh2), @('box-drawing 3 ', $box), @('emoji 1 ', $emoji))) {
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$name = $item[0]; $s = $item[1]
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$chars = $s.ToCharArray()
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$codes = ($chars | ForEach-Object { 'U+{0:X4}' -f [int]$_ }) -join ' '
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$surr = if ($s.Length -gt 0) { ($s.ToCharArray() | Where-Object { [int]$_ -ge 0xD800 -and [int]$_ -le 0xDFFF }).Count } else { 0 }
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L (" $name : .Length=$($s.Length) UTF16-surrogates=$surr Measure-Object -Character=$(($s | Measure-Object -Character).Characters) codeunits=$codes")
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}
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$ms = [string]::Concat($zh, ':', [System.IO.File]::ReadAllText((Join-Path $env:TEMP 'nowhere.txt')) ) 2>$null
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L ""
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L "WHICH BUILT-IN CAN MEASURE DISPLAY WIDTH? (probe of plausible names)"
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$candidates = @('Get-DisplayWidth','Get-StringWidth','Measure-String','Get-VisualLength','Get-ConsoleStringWidth','Format-WideString','Get-WCWidth','Get-CharWidth','Get-TextWidth','Measure-Text','Get-EastAsianWidth')
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foreach ($c in $candidates) {
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$cmd = Get-Command $c -ErrorAction SilentlyContinue
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L (" Get-Command $c -> " + $(if ($cmd) { $cmd.CommandType.ToString() + ' ' + $cmd.Source } else { 'NOT FOUND' }))
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}
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L (" [System.Globalization.StringInfo]::ParseCombiningCharacters('$zh').Count = " + [System.Globalization.StringInfo]::ParseCombiningCharacters($zh).Count + " (text-element count, NOT width)")
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L (" TextInfo: CurrentCulture = " + [System.Globalization.CultureInfo]::CurrentCulture.Name)
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L (" IsInputRedirected/IsOutputRedirected : " + [Console]::IsInputRedirected + '/' + [Console]::IsOutputRedirected)
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L ""
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L "CURSOR POSITION TEST (needs a real console; skipped if redirected)"
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$skip = $false
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try { if ([Console]::IsOutputRedirected) { L " SKIPPED: stdout is redirected, [Console]::SetCursorPosition would throw 'The handle is invalid'"; $skip = $true } } catch { $skip = $true }
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if (-not $skip) {
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try {
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[Console]::CursorVisible = $false
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foreach ($pair in @(@('8 ASCII chars ', $ascii8), @('2 CJK chars ', $zh), @('4 CJK chars ', $zh2), @('3 box-drawing ', $box), @('1 emoji ', $emoji))) {
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$name = $pair[0]; $s = $pair[1]
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[Console]::BufferWidth = [Console]::BufferWidth
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[Console]::SetCursorPosition(0, 10)
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[Console]::Write($s)
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$after = [Console]::CursorLeft
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L (" write '$name' from column 0 -> CursorLeft = $after (implied display columns = $after)")
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}
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[Console]::SetCursorPosition(0, 10); [Console]::Write('.' * 40)
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[Console]::SetCursorPosition(0, 10); [Console]::Write($zh); [Console]::Write('X')
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L " visual check: expect 'ZhongWenX' where X starts at column 4 (2 CJK = 4 columns)"
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[Console]::CursorVisible = $true
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} catch { L (" CURSOR TEST THREW: " + $_.Exception.Message) }
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}
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[System.IO.File]::WriteAllLines($OutFile, $lines, (New-Object System.Text.UTF8Encoding($false)))
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Write-Host ("[width-probe {0}] done, wrote {1}" -f $HostLabel, $OutFile) -ForegroundColor Yellow
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if ($WatchSeconds -gt 0) { Start-Sleep -Seconds $WatchSeconds }
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