TypeScriptToLua · Perryvw · Dec 28, 2018 · Dec 27, 2018 · Dec 27, 2018 · Dec 28, 2018
diff --git a/src/Transpiler.ts b/src/Transpiler.ts
@@ -542,15 +542,24 @@ export abstract class LuaTranspiler {
     public transpileFor(node: ts.ForStatement): string {
         // Add header
         let result = "";
-        for (const variableDeclaration of (node.initializer as ts.VariableDeclarationList).declarations) {
-            result += this.indent + this.transpileVariableDeclaration(variableDeclaration) + "\n";
+
+        if (node.initializer) {
+            for (const variableDeclaration of (node.initializer as ts.VariableDeclarationList).declarations) {
+                result += this.indent + this.transpileVariableDeclaration(variableDeclaration) + "\n";
+            }
         }
-        result += this.indent + `while(${this.transpileExpression(node.condition)}) do\n`;
+
+        const conditionText = node.condition ? this.transpileExpression(node.condition) : "true";
+        result += this.indent + `while (${conditionText}) do\n`;
 
         // Add body
         this.pushIndent();
         result += this.transpileLoopBody(node);
-        result += this.indent + this.transpileExpression(node.incrementor) + "\n";
+
+        if (node.incrementor) {
+            result += this.indent + this.transpileExpression(node.incrementor) + "\n";
+        }
+
         this.popIndent();
 
         result += this.indent + "end\n";

diff --git a/test/translation/lua/continue.lua b/test/translation/lua/continue.lua
@@ -1,5 +1,5 @@
 local i = 0
-while(i<10) do
+while (i<10) do
     do
         if i<5 then
             goto __continue0

diff --git a/test/translation/lua/continueConcurrent.lua b/test/translation/lua/continueConcurrent.lua
@@ -1,5 +1,5 @@
 local i = 0
-while(i<10) do
+while (i<10) do
     do
         if i<5 then
             goto __continue0

diff --git a/test/translation/lua/continueNested.lua b/test/translation/lua/continueNested.lua
@@ -1,11 +1,11 @@
 local i = 0
-while(i<5) do
+while (i<5) do
     do
         if (i%2)==0 then
             goto __continue0
         end
         local j = 0
-        while(j<2) do
+        while (j<2) do
             do
                 if j==1 then
                     goto __continue1

diff --git a/test/translation/lua/continueNestedConcurrent.lua b/test/translation/lua/continueNestedConcurrent.lua
@@ -1,11 +1,11 @@
 local i = 0
-while(i<5) do
+while (i<5) do
     do
         if (i%2)==0 then
             goto __continue0
         end
         local j = 0
-        while(j<2) do
+        while (j<2) do
             do
                 if j==1 then
                     goto __continue1

diff --git a/test/translation/lua/for.lua b/test/translation/lua/for.lua
@@ -1,5 +1,5 @@
 local i = 1
-while(i<=100) do
+while (i<=100) do
     do
     end
     ::__continue0::

diff --git a/test/unit/loops.spec.ts b/test/unit/loops.spec.ts
@@ -183,6 +183,76 @@ export class LuaLoopTests {
         Expect(result).toBe(JSON.stringify(expected));
     }
 
+    @TestCase([0, 1, 2, 3], [1, 2, 3, 4])
+    @Test("forNoDeclarations")
+    public forNoDeclarations(inp: number[], expected: number[]): void {
+        // Transpile
+        const lua = util.transpileString(
+            `let arrTest = ${JSON.stringify(inp)};
+            let i = 0;
+            for (; i < arrTest.length; ++i) {
+                arrTest[i] = arrTest[i] + 1;
+            }
+            return JSONStringify(arrTest);`
+        );
+
+        // Execute
+        const result = util.executeLua(lua);
+
+        // Assert
+        Expect(result).toBe(JSON.stringify(expected));
+    }
+
+    @TestCase([0, 1, 2, 3], [1, 2, 3, 4])
+    @Test("forNoCondition")
+    public forNoCondition(inp: number[], expected: number[]): void {
+        // Transpile
+        const lua = util.transpileString(
+            `let arrTest = ${JSON.stringify(inp)};
+            let i = 0;
+            for (;; ++i) {
+                if (i >= arrTest.length) {
+                    break;
+                }
+
+                arrTest[i] = arrTest[i] + 1;
+            }
+            return JSONStringify(arrTest);`
+        );
+
+        // Execute
+        const result = util.executeLua(lua);
+
+        // Assert
+        Expect(result).toBe(JSON.stringify(expected));
+    }
+
+    @TestCase([0, 1, 2, 3], [1, 2, 3, 4])
+    @Test("forNoPostExpression")
+    public forNoPostExpression(inp: number[], expected: number[]): void {
+        // Transpile
+        const lua = util.transpileString(
+            `let arrTest = ${JSON.stringify(inp)};
+            let i = 0;
+            for (;;) {
+                if (i >= arrTest.length) {
+                    break;
+                }
+
+                arrTest[i] = arrTest[i] + 1;
+
+                i++;
+            }
+            return JSONStringify(arrTest);`
+        );
+
+        // Execute
+        const result = util.executeLua(lua);
+
+        // Assert
+        Expect(result).toBe(JSON.stringify(expected));
+    }
+
     @TestCase([0, 1, 2, 3], [1, 2, 3, 4], "let i = 0; i < arrTest.length; i++")
     @TestCase([0, 1, 2, 3], [1, 2, 3, 4], "let i = 0; i <= arrTest.length - 1; i++")
     @TestCase([0, 1, 2, 3], [1, 2, 3, 4], "let i = 0; arrTest.length > i; i++")