Function validateConcurrencyGroupExpression

pkg/workflow/concurrency_validation.go:51–75

validateConcurrencyGroupExpression validates the syntax of a custom concurrency group expression. It checks for common syntactic errors that would cause runtime failures: - Unbalanced ${{ }} braces - Missing closing braces - Malformed GitHub Actions expressions - Invalid operator placement Returns

(group string)

//
// Returns an error if validation fails, nil otherwise.
func validateConcurrencyGroupExpression(group string) error {
	if strings.TrimSpace(group) == "" {
		return NewValidationError(
			"concurrency",
			"empty concurrency group expression",
			"the concurrency group expression is empty or contains only whitespace",
			"Provide a non-empty concurrency group name or expression. Example: 'my-workflow-${{ github.ref }}'",
		)
	}

	concurrencyValidationLog.Printf("Validating concurrency group expression: %s", group)

	// Check for balanced ${{ }} braces
	if err := validateBalancedBraces(group); err != nil {
		return err
	}

	// Extract and validate each GitHub Actions expression within ${{ }}
	if err := validateExpressionSyntax(group); err != nil {
		return err
	}

	concurrencyValidationLog.Print("Concurrency group expression validation passed")
	return nil
}

// extractConcurrencyGroupFromYAML extracts the group value from a YAML-formatted concurrency string.
// The input is expected to be in the format generated by the compiler: