From e09752bdb731490788326bf60c2e4aaeb5b07aa2 Mon Sep 17 00:00:00 2001
From: Kun Li <kun@moderne.io>
Date: Thu, 5 Oct 2023 17:30:45 -0700
Subject: [PATCH] Support KString

---
 .../internal/KotlinTreeParserVisitor.java     | 35 +++++++++++++++++--
 .../kotlin/internal/PsiTreePrinter.java       |  2 ++
 2 files changed, 34 insertions(+), 3 deletions(-)

diff --git a/src/main/java/org/openrewrite/kotlin/internal/KotlinTreeParserVisitor.java b/src/main/java/org/openrewrite/kotlin/internal/KotlinTreeParserVisitor.java
index b0271c055..efcc2fc2f 100644
--- a/src/main/java/org/openrewrite/kotlin/internal/KotlinTreeParserVisitor.java
+++ b/src/main/java/org/openrewrite/kotlin/internal/KotlinTreeParserVisitor.java
@@ -197,7 +197,17 @@ public J visitBinaryWithTypeRHSExpression(KtBinaryExpressionWithTypeRHS expressi
 
     @Override
     public J visitBlockStringTemplateEntry(KtBlockStringTemplateEntry entry, ExecutionContext data) {
-        throw new UnsupportedOperationException("TODO");
+        J tree = entry.getExpression().accept(this, data);
+        boolean inBraces = true;
+
+        return new K.KString.Value(
+                randomId(),
+                Space.EMPTY,
+                Markers.EMPTY,
+                tree,
+                suffix(entry.getExpression()),
+                inBraces
+        );
     }
 
     @Override
@@ -362,12 +372,16 @@ public J visitLiteralStringTemplateEntry(KtLiteralStringTemplateEntry entry, Exe
             throw new UnsupportedOperationException("Unsupported KtStringTemplateEntry child");
         }
 
+        boolean quoted = entry.getPrevSibling().getNode().getElementType() == KtTokens.OPEN_QUOTE &&
+                entry.getNextSibling().getNode().getElementType() == KtTokens.CLOSING_QUOTE;
+
+        String valueSource = quoted ? "\"" + leaf.getText() + "\"" : leaf.getText();
         return new J.Literal(
                 Tree.randomId(),
                 Space.EMPTY,
                 Markers.EMPTY,
                 leaf.getText(),
-                "\"" + leaf.getText() + "\"", // todo, support text block
+                valueSource, // todo, support text block
                 null,
                 primitiveType(entry)
         );
@@ -1696,8 +1710,23 @@ public J visitSimpleNameExpression(KtSimpleNameExpression expression, ExecutionC
     @Override
     public J visitStringTemplateExpression(KtStringTemplateExpression expression, ExecutionContext data) {
         KtStringTemplateEntry[] entries = expression.getEntries();
+
         if (entries.length > 1) {
-            throw new UnsupportedOperationException("Unsupported constant expression elementType, TODO");
+            String delimiter = "\"";
+            List<J> values = new ArrayList<>();
+
+            for (KtStringTemplateEntry entry : entries) {
+                values.add(entry.accept(this, data));
+            }
+
+            return new K.KString(
+                    randomId(),
+                    prefix(expression),
+                    Markers.EMPTY,
+                    delimiter,
+                    values,
+                    type(expression)
+            );
         }
 
         if (entries.length == 0) {
diff --git a/src/main/java/org/openrewrite/kotlin/internal/PsiTreePrinter.java b/src/main/java/org/openrewrite/kotlin/internal/PsiTreePrinter.java
index b8f68640f..bfc8d9a6d 100644
--- a/src/main/java/org/openrewrite/kotlin/internal/PsiTreePrinter.java
+++ b/src/main/java/org/openrewrite/kotlin/internal/PsiTreePrinter.java
@@ -317,6 +317,8 @@ private static String printTreeElement(Tree tree) {
                 || tree instanceof J.TypeParameter
                 || tree instanceof K.CompilationUnit
                 || tree instanceof K.StatementExpression
+                || tree instanceof K.KString
+                || tree instanceof K.KString.Value
                 || tree instanceof K.ExpressionStatement
                 || tree instanceof J.Package
         ) {