Add support for case function #4147
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Pull request overview
This PR adds support for a new case expression function that provides conditional evaluation similar to a switch/case or if-else-if chain. The function accepts an odd number of arguments: pairs of boolean predicates and their corresponding results, plus a default value.
- Implements the
Casefunction in multiple expression namespaces (GitHub.Actions.Expressions and GitHub.DistributedTask.Expressions2) - Adds an
AllowCaseFunctionflag to control whether the case function is available in specific contexts - Includes parser-level validation to ensure the case function receives an odd number of parameters
Reviewed changes
Copilot reviewed 18 out of 18 changed files in this pull request and generated 6 comments.
Show a summary per file
| File | Description |
|---|---|
| src/Sdk/Expressions/Sdk/Functions/Case.cs | New implementation of the Case function for GitHub Actions expressions |
| src/Sdk/DTExpressions2/Expressions2/Sdk/Functions/Case.cs | Duplicate Case function implementation for DistributedTask expressions |
| src/Sdk/Expressions/ExpressionConstants.cs | Registers the case function with min 3 and max 255 parameters |
| src/Sdk/DTExpressions2/Expressions2/ExpressionConstants.cs | Registers the case function in DTExpressions2 namespace |
| src/Sdk/Expressions/ParseExceptionKind.cs | Adds EvenParameters exception type for case function validation |
| src/Sdk/DTExpressions2/Expressions2/ParseExceptionKind.cs | Adds EvenParameters exception type in DTExpressions2 |
| src/Sdk/Expressions/ParseException.cs | Adds error message for even parameter count |
| src/Sdk/DTExpressions2/Expressions2/ParseException.cs | Adds error message for even parameter count in DTExpressions2 |
| src/Sdk/Expressions/ExpressionParser.cs | Adds allowCaseFunction parameter and validation logic for even parameters |
| src/Sdk/DTExpressions2/Expressions2/ExpressionParser.cs | Adds allowCaseFunction parameter and validation logic in DTExpressions2 |
| src/Sdk/WorkflowParser/ObjectTemplating/TemplateContext.cs | Adds AllowCaseFunction property defaulting to true |
| src/Sdk/DTObjectTemplating/ObjectTemplating/TemplateContext.cs | Adds AllowCaseFunction property in DTObjectTemplating |
| src/Sdk/WorkflowParser/ObjectTemplating/Tokens/TemplateToken.cs | Passes AllowCaseFunction to expression parser in 4 evaluation methods |
| src/Sdk/DTObjectTemplating/ObjectTemplating/Tokens/TemplateToken.cs | Passes AllowCaseFunction to expression parser in 4 evaluation methods |
| src/Sdk/WorkflowParser/Conversion/WorkflowTemplateConverter.cs | Passes AllowCaseFunction when converting if conditions |
| src/Sdk/DTPipelines/Pipelines/ObjectTemplating/PipelineTemplateConverter.cs | Passes AllowCaseFunction when converting if conditions |
| src/Runner.Worker/ActionManifestManager.cs | Disables case function for action manifest parsing |
| src/Runner.Worker/ActionManifestManagerLegacy.cs | Disables case function for legacy action manifest parsing |
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
ericsciple
reviewed
Dec 17, 2025
| try | ||
| { | ||
| var tree = new ExpressionParser().CreateTree(expression, null, context.GetExpressionNamedValues(), context.ExpressionFunctions); | ||
| var tree = new ExpressionParser().CreateTree(expression, null, context.GetExpressionNamedValues(), context.ExpressionFunctions, allowCaseFunction: context.AllowCaseFunction); |
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is this for the evaluator? Do we hardcode to true for the evaluator?
Basically I just want to make sure we set to true for evaluation. If evaluation works E2E then 👍
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Yup, this is defaulted to true but will allow the manifest manager code paths to disable it.
ericsciple
approved these changes
Dec 17, 2025
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