#33 Ternary expressions

Author: angelolloqui

Sources/SwiftKotlinFramework/KotlinTokenizer.swift

@@ -553,6 +553,53 @@ public class KotlinTokenizer: SwiftTokenizer {
         return tokenize(expression.postfixExpression) + expression.newToken(.symbol, "!!")
     }
 
+    open override func tokenize(_ expression: TernaryConditionalOperatorExpression) -> [Token] {
+        return [
+            [expression.newToken(.keyword, "if")],
+            tokenize(expression.conditionExpression)
+                .prefix(with: expression.newToken(.startOfScope, "("))
+                .suffix(with: expression.newToken(.endOfScope, ")")),
+            tokenize(expression.trueExpression),
+            [expression.newToken(.keyword, "else")],
+            tokenize(expression.falseExpression),
+            ].joined(token: expression.newToken(.space, " "))
+    }
+
+
+    open override func tokenize(_ expression: SequenceExpression) -> [Token] {
+        var elementTokens = expression.elements.map({ tokenize($0, node: expression) })
+
+        //If there is a ternary, then prefix with if
+        if let ternaryOperatorIndex = expression.elements.index(where: { $0.isTernaryConditionalOperator }),
+            ternaryOperatorIndex > 0 {
+            let assignmentIndex = expression.elements.index(where: { $0.isAssignmentOperator }) ?? -1
+            let prefixTokens = [
+                expression.newToken(.keyword, "if"),
+                expression.newToken(.space, " "),
+                expression.newToken(.startOfScope, "("),
+            ]
+            elementTokens[assignmentIndex + 1] =
+                prefixTokens +
+                elementTokens[assignmentIndex + 1]
+            elementTokens[ternaryOperatorIndex - 1] = elementTokens[ternaryOperatorIndex - 1]
+                .suffix(with: expression.newToken(.endOfScope, ")"))
+        }
+        return elementTokens.joined(token: expression.newToken(.space, " "))
+    }
+
+    open override func tokenize(_ element: SequenceExpression.Element, node: ASTNode) -> [Token] {
+        switch element {
+        case .ternaryConditionalOperator(let expr):
+            return [
+                tokenize(expr),
+                [node.newToken(.keyword, "else")],
+                ].joined(token: node.newToken(.space, " "))
+        default:
+            return super.tokenize(element, node: node)
+        }
+    }
+
+
     // MARK: - Types
     open override func tokenize(_ type: ArrayType, node: ASTNode) -> [Token] {
         return

Sources/SwiftKotlinFramework/utils/AST+Operations.swift

@@ -146,4 +146,21 @@ extension EnumDeclaration.Member {
     }
 }
 
-
+extension SequenceExpression.Element {
+    var isTernaryConditionalOperator: Bool {
+        switch self {
+        case .ternaryConditionalOperator:
+            return true
+        default:
+            return false
+        }
+    }
+    var isAssignmentOperator: Bool {
+        switch self {
+        case .assignmentOperator:
+            return true
+        default:
+            return false
+        }
+    }
+}

SwiftKotlin.xcodeproj/xcshareddata/xcschemes/SwiftKotlin-Package.xcscheme

@@ -15,7 +15,7 @@
             <BuildableReference
                BuildableIdentifier = "primary"
                BlueprintIdentifier = "SwiftKotlin::SwiftKotlinCommandLine"
-               BuildableName = "SwiftKotlinCommandLine"
+               BuildableName = "swiftkotlin"
                BlueprintName = "SwiftKotlinCommandLine"
                ReferencedContainer = "container:SwiftKotlin.xcodeproj">
             </BuildableReference>
@@ -213,7 +213,7 @@
          <BuildableReference
             BuildableIdentifier = "primary"
             BlueprintIdentifier = "SwiftKotlin::SwiftKotlinCommandLine"
-            BuildableName = "SwiftKotlinCommandLine"
+            BuildableName = "swiftkotlin"
             BlueprintName = "SwiftKotlinCommandLine"
             ReferencedContainer = "container:SwiftKotlin.xcodeproj">
          </BuildableReference>

SwiftKotlin.xcodeproj/xcshareddata/xcschemes/SwiftKotlinCommandLine.xcscheme

@@ -15,7 +15,7 @@
             <BuildableReference
                BuildableIdentifier = "primary"
                BlueprintIdentifier = "SwiftKotlin::SwiftKotlinCommandLine"
-               BuildableName = "SwiftKotlinCommandLine"
+               BuildableName = "swiftkotlin"
                BlueprintName = "SwiftKotlinCommandLine"
                ReferencedContainer = "container:SwiftKotlin.xcodeproj">
             </BuildableReference>
@@ -34,7 +34,7 @@
          <BuildableReference
             BuildableIdentifier = "primary"
             BlueprintIdentifier = "SwiftKotlin::SwiftKotlinCommandLine"
-            BuildableName = "SwiftKotlinCommandLine"
+            BuildableName = "swiftkotlin"
             BlueprintName = "SwiftKotlinCommandLine"
             ReferencedContainer = "container:SwiftKotlin.xcodeproj">
          </BuildableReference>
@@ -58,7 +58,7 @@
          <BuildableReference
             BuildableIdentifier = "primary"
             BlueprintIdentifier = "SwiftKotlin::SwiftKotlinCommandLine"
-            BuildableName = "SwiftKotlinCommandLine"
+            BuildableName = "swiftkotlin"
             BlueprintName = "SwiftKotlinCommandLine"
             ReferencedContainer = "container:SwiftKotlin.xcodeproj">
          </BuildableReference>
@@ -77,7 +77,7 @@
          <BuildableReference
             BuildableIdentifier = "primary"
             BlueprintIdentifier = "SwiftKotlin::SwiftKotlinCommandLine"
-            BuildableName = "SwiftKotlinCommandLine"
+            BuildableName = "swiftkotlin"
             BlueprintName = "SwiftKotlinCommandLine"
             ReferencedContainer = "container:SwiftKotlin.xcodeproj">
          </BuildableReference>

Tests/SwiftKotlinFrameworkTests/Tests/KotlinTokenizer/control_flow.kt

@@ -76,3 +76,7 @@ when (nb) {
     }
     else -> print("three or more digits")
 }
+val value = if (isTrue) "yes" else "no"
+val label = if (x > 0) "Positive" else "negative"
+button.color = if (item.deleted) red else green
+val text = label ?: "default"

Tests/SwiftKotlinFrameworkTests/Tests/KotlinTokenizer/control_flow.swift

@@ -59,3 +59,11 @@ switch nb {
 
     default: print("three or more digits")
 }
+
+// Ternary and coalescing operators
+let value = isTrue ? "yes" : "no"
+let label = x > 0 ? "Positive" : "negative"
+button.color = item.deleted ? red : green
+let text = label ?? "default"
+
+