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# Licensed under the MIT License.
Describe 'Line Continuance' -Tags 'CI' {
BeforeAll {
function ExecuteCommand {
param ([string]$command)
[powershell]::Create().AddScript($command).Invoke()
}
$whitespace = "`t `f`v$([char]0x00a0)$([char]0x0085)"
}
Context 'Lines ending with a backtick that parse and execute without error' {
It 'Lines ending with a single backtick' {
$script = @'
'Hello' + `
' world'
'@
ExecuteCommand $script | Should -BeExactly 'Hello world'
}
It 'Lines ending with a single backtick followed only by a CR (old-style Mac line ending)' {
$script = "'Hello' + ```r' world'"
ExecuteCommand $script | Should -Be 'Hello world'
}
It 'Lines ending with a single backtick followed by whitespace' {
$script = @'
# The first line of this command ends with trailing whitespace
'Hello' + `
'@ + $whitespace + @'
' world'
'@
ExecuteCommand $script | Should -Be 'Hello world'
}
It 'Lines ending with a single backtick followed by whitespace and a comment' {
$script = @'
'Hello' + ` # You can place comments after whitespace following backticks
' world'
'@
ExecuteCommand $script | Should -Be 'Hello world'
}
It 'Lines ending with a single backtick followed by a comment line and then the continued line' {
$script = @'
'Hello' + `
# You can place comments in the middle of a continued line
' world'
'@
ExecuteCommand $script | Should -Be 'Hello world'
}
}
Context 'Lines ending with a backtick that do not parse' {
It 'Lines ending with a single backtick followed immediately by a comment' {
$script = @'
'Hello' + `# This is not a valid comment
' world'
'@
$err = { ExecuteCommand $script } | Should -Throw -ErrorId 'ParseException' -PassThru
$err.Exception.InnerException.ErrorRecord.FullyQualifiedErrorId | Should -BeExactly 'ExpectedValueExpression'
}
It 'Lines ending with two backticks' {
$script = @'
'Hello' + ``
' world'
'@
$err = { ExecuteCommand $script } | Should -Throw -ErrorId 'ParseException' -PassThru
$err.Exception.InnerException.ErrorRecord.FullyQualifiedErrorId | Should -BeExactly 'ExpectedValueExpression'
}
}
Context 'Lines ending with a pipe that parse and execute without error' {
It 'Lines ending with a pipe' {
$script = @'
'Hello' |
ForEach-Object {"$_ world"}
'@
ExecuteCommand $script | Should -Be 'Hello world'
}
It 'Lines ending with a pipe followed only by a CR (old-style Mac line ending)' {
$script = "'Hello' |`r ForEach-Object {`"`$_ world`"}"
ExecuteCommand $script | Should -Be 'Hello world'
}
It 'Lines ending with a pipe followed by whitespace' {
$script = @'
# The next line ends with trailing whitespace
'Hello' |
'@ + $whitespace + @'
ForEach-Object {"$_ world"}
'@
ExecuteCommand $script | Should -Be 'Hello world'
}
It 'Lines ending with a pipe followed by a comment' {
$script = @'
'Hello' |# You can place comments after whitespace following pipes
ForEach-Object {"$_ world"}
'@
ExecuteCommand $script | Should -Be 'Hello world'
}
It 'Lines ending with a pipe followed by a comment line and then the continued command' {
$script = @'
'Hello' |
# You can place comments in the middle of a continued pipeline
ForEach-Object {"$_ world"}
'@
ExecuteCommand $script | Should -Be 'Hello world'
}
}
Context 'Lines ending with a pipe that do not parse' {
It 'Lines ending with a single pipe followed by an empty line' {
$script = @'
'Hello' |
'@
$err = { ExecuteCommand $script } | Should -Throw -ErrorId 'ParseException' -PassThru
$err.Exception.InnerException.ErrorRecord.FullyQualifiedErrorId | Should -BeExactly 'EmptyPipeElement'
}
It 'Lines ending with a single pipe followed by a line that starts with a pipe' {
$script = @'
'Hello' |
|
'@
$err = { ExecuteCommand $script } | Should -Throw -ErrorId 'ParseException' -PassThru
$err.Exception.InnerException.ErrorRecord.FullyQualifiedErrorId | Should -BeExactly 'EmptyPipeElement'
}
}
Context 'Parsing and executing without error while using a pipe at the beginning of a line to continue the previous line' {
It 'Line continuance using a pipe at the start of a subsequent line' {
$script = @'
'Hello'
| ForEach-Object {"$_ world"}
'@
ExecuteCommand $script | Should -BeExactly 'Hello world'
}
It 'Line continuance using a pipe at the start of a subsequent line after a CR (old-style Mac line ending)' {
$script = "'Hello'`r | ForEach-Object {`"`$_ world`"}"
ExecuteCommand $script | Should -BeExactly 'Hello world'
}
It 'Longer line continuance using pipes at the start of subsequent lines' {
$script = @'
1..10
| ForEach-Object {($_ -shl 1) + $_}
| Where-Object {$_ % 2 -eq 0}
| Sort-Object -Descending
'@
ExecuteCommand $script | Should -Be @(30, 24, 18, 12, 6)
}
It 'Line continuance using a comment line followed by a pipe at the start of a subsequent line' {
$script = @'
'Hello'
# You can place comments before continued pipelines
| ForEach-Object {"$_ world"}
'@
ExecuteCommand $script | Should -BeExactly 'Hello world'
}
It 'Longer line continuance using pipes at the start of subsequent lines (with comments)' {
$script = @'
1..10
# Times three
| ForEach-Object {($_ -shl 1) + $_}
# Even only
| Where-Object {$_ % 2 -eq 0}
# Reverse order
| Sort-Object -Descending
'@
ExecuteCommand $script | Should -Be @(30, 24, 18, 12, 6)
}
It 'Line continuance using a pipe on a line by itself' {
$script = @'
'Hello'
|
ForEach-Object {"$_ world"}
'@
ExecuteCommand $script | Should -BeExactly 'Hello world'
}
It 'Longer line continuance using pipes on lines by themselves' {
$script = @'
1..10
|
ForEach-Object {($_ -shl 1) + $_}
|
Where-Object {$_ % 2 -eq 0}
|
Sort-Object -Descending
'@
ExecuteCommand $script | Should -Be @(30, 24, 18, 12, 6)
}
It 'Line continuance using a pipe on a line by itself (with comments)' {
$script = @'
'Hello'
|
# You can place comments before continued pipelines
ForEach-Object {"$_ world"}
'@
ExecuteCommand $script | Should -BeExactly 'Hello world'
}
It 'Longer line continuance using pipes on lines by themselves (with comments)' {
$script = @'
1..10
|
# Times three
ForEach-Object {($_ -shl 1) + $_}
|
# Even only
Where-Object {$_ % 2 -eq 0}
|
# Reverse order
Sort-Object -Descending
'@
ExecuteCommand $script | Should -Be @(30, 24, 18, 12, 6)
}
}
Context 'Lines starting with a pipe that do not parse' {
It 'Lines starting with a single pipe with nothing after it' {
$script = @'
'Hello'
| # Nothing to see here, move along
'@
$err = { ExecuteCommand $script } | Should -Throw -ErrorId 'ParseException' -PassThru
$err.Exception.InnerException.ErrorRecord.FullyQualifiedErrorId | Should -BeExactly 'EmptyPipeElement'
}
It 'Lines starting with a single pipe with blank lines after it' {
$script = @'
'Hello'
|
'@
$err = { ExecuteCommand $script } | Should -Throw -ErrorId 'ParseException' -PassThru
$err.Exception.InnerException.ErrorRecord.FullyQualifiedErrorId | Should -BeExactly 'EmptyPipeElement'
}
It 'Lines starting with a single pipe that have a blank line before it' {
$script = @'
'Hello'
| ForEach-Object {"$_ world"}
'@
$err = { ExecuteCommand $script } | Should -Throw -ErrorId 'ParseException' -PassThru
$err.Exception.InnerException.ErrorRecord.FullyQualifiedErrorId | Should -BeExactly 'EmptyPipeElement'
}
It 'Lines starting with a single pipe that have a line with whitespace before it' {
$script = @"
'Hello'
$whitespace
| ForEach-Object {"`$_ world"}
"@
$err = { ExecuteCommand $script } | Should -Throw -ErrorId 'ParseException' -PassThru
$err.Exception.InnerException.ErrorRecord.FullyQualifiedErrorId | Should -BeExactly 'EmptyPipeElement'
}
It 'Lines starting with a single pipe that have a line with nothing but a backtick before it' {
$script = @'
'Hello'
`
| ForEach-Object {"$_ world"}
'@
$err = { ExecuteCommand $script } | Should -Throw -ErrorId 'ParseException' -PassThru
$err.Exception.InnerException.ErrorRecord.FullyQualifiedErrorId | Should -BeExactly 'EmptyPipeElement'
}
}
}
|