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Fix NullReferenceException in AvoidAssignmentToAutomaticVariable rule when assigning a .Net property and only look at the LHS #1008

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Merged
merged 6 commits into from
Jun 5, 2018
Merged

Fix NullReferenceException in AvoidAssignmentToAutomaticVariable rule when assigning a .Net property and only look at the LHS #1008

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3701e65
Fix NullReferenceException in AvoidAssignmentToAutomaticVariable rule…
bergmeister Jun 2, 2018
9910fda
when variableExpressionAst is null, then continue loop to reduce nesting
bergmeister Jun 4, 2018
e4d1c72
fix indentation for cleaner diff
bergmeister Jun 4, 2018
8136638
Fix issue #1013 as well by making sure the rule looks only the LHS
bergmeister Jun 4, 2018
f818df7
Fix issue #1012 as well
bergmeister Jun 4, 2018
9fbe4e1
Simplify test that checks that PSSA does not throw to address PR review
bergmeister Jun 5, 2018
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5 changes: 3 additions & 2 deletions Rules/AvoidAssignmentToAutomaticVariable.cs
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Expand Up @@ -44,9 +44,10 @@ public IEnumerable<DiagnosticRecord> AnalyzeScript(Ast ast, string fileName)
if (ast == null) throw new ArgumentNullException(Strings.NullAstErrorMessage);

IEnumerable<Ast> assignmentStatementAsts = ast.FindAll(testAst => testAst is AssignmentStatementAst, searchNestedScriptBlocks: true);
foreach (var assignmentStatementAst in assignmentStatementAsts)
foreach (AssignmentStatementAst assignmentStatementAst in assignmentStatementAsts)
{
var variableExpressionAst = assignmentStatementAst.Find(testAst => testAst is VariableExpressionAst, searchNestedScriptBlocks: false) as VariableExpressionAst;
var variableExpressionAst = assignmentStatementAst.Left.Find(testAst => testAst is VariableExpressionAst && testAst.Parent == assignmentStatementAst, searchNestedScriptBlocks: false) as VariableExpressionAst;
if (variableExpressionAst == null) { continue; }
var variableName = variableExpressionAst.VariablePath.UserPath;
if (_readOnlyAutomaticVariables.Contains(variableName, StringComparer.OrdinalIgnoreCase))
{
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14 changes: 14 additions & 0 deletions Tests/Rules/AvoidAssignmentToAutomaticVariable.tests.ps1
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Expand Up @@ -63,6 +63,20 @@ Describe "AvoidAssignmentToAutomaticVariables" {
$warnings.Count | Should -Be 0
}

It "Does not throw a NullReferenceException when using assigning a .Net property to a .Net property (Bug in 1.17.0 - issue 1007)" {
Invoke-ScriptAnalyzer -ScriptDefinition '[foo]::bar = [baz]::qux' -ErrorAction Stop
}

It "Does not flag properties of a readonly variable (issue 1012)" {
[System.Array] $warnings = Invoke-ScriptAnalyzer -ScriptDefinition '$Host.PrivateData["ErrorBackgroundColor"] = "Black"'
$warnings.Count | Should -Be 0
}

It "Does not flag RHS of variable assignment (Bug in 1.17.0, issue 1013)" {
[System.Array] $warnings = Invoke-ScriptAnalyzer -ScriptDefinition '[foo]::bar = $true'
$warnings.Count | Should -Be 0
}

It "Setting Variable <VariableName> throws exception in applicable PowerShell version to verify the variables is read-only" -TestCases $testCases_ReadOnlyVariables {
param ($VariableName, $ExpectedSeverity, $OnlyPresentInCoreClr)

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