From 4189eb24789bd5d1d9ef4ecea567f4119cbb325c Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sun, 31 Jul 2016 19:13:45 +0100
Subject: Implement for loops using desugar

---
 .../couscous/frontends/java/JavaStatementReader.java    | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

(limited to 'src/main/java/org/zwobble/couscous/frontends')

diff --git a/src/main/java/org/zwobble/couscous/frontends/java/JavaStatementReader.java b/src/main/java/org/zwobble/couscous/frontends/java/JavaStatementReader.java
index 72f94d5..6e9444c 100644
--- a/src/main/java/org/zwobble/couscous/frontends/java/JavaStatementReader.java
+++ b/src/main/java/org/zwobble/couscous/frontends/java/JavaStatementReader.java
@@ -20,6 +20,7 @@ import static org.zwobble.couscous.ast.VariableReferenceNode.reference;
 import static org.zwobble.couscous.ast.WhileNode.whileLoop;
 import static org.zwobble.couscous.ast.sugar.SwitchCaseNode.switchCase;
 import static org.zwobble.couscous.frontends.java.JavaTypes.typeOf;
+import static org.zwobble.couscous.util.ExtraIterables.only;
 import static org.zwobble.couscous.util.ExtraIterables.takeUntil;
 import static org.zwobble.couscous.util.ExtraLists.*;
 import static org.zwobble.couscous.util.Tails.tail;
@@ -180,19 +181,15 @@ class JavaStatementReader {
     private List<StatementNode> readForStatement(ForStatement statement) {
         @SuppressWarnings("unchecked")
         List<VariableDeclarationExpression> javaInitialisers = statement.initializers();
-        if (javaInitialisers.size() != 1) {
-            throw new UnsupportedOperationException();
-        }
         @SuppressWarnings("unchecked")
         List<Expression> updaters = statement.updaters();
 
-        return append(
-            readVariableDeclarationExpression(javaInitialisers.get(0)),
-            whileLoop(
-                readExpression(Types.BOOLEAN, statement.getExpression()),
-                concat(
-                    readBody(statement.getBody()),
-                    eagerMap(updaters, updater -> expressionStatement(readExpressionWithoutBoxing(updater))))));
+        return list(new ForNode(
+            readVariableDeclarationExpression(only(javaInitialisers)),
+            readExpression(Types.BOOLEAN, statement.getExpression()),
+            eagerMap(updaters, this::readExpressionWithoutBoxing),
+            readBody(statement.getBody())
+        ));
     }
 
     private List<StatementNode> readEnhancedForStatement(EnhancedForStatement statement) {
-- 
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