From 4fa0c79e265ef129aead21d9d8b4d571800576ba Mon Sep 17 00:00:00 2001
From: Jordi Baylina <jordi@baylina.cat>
Date: Wed, 24 Oct 2018 19:59:50 +0200
Subject: [PATCH] If without else

---
 src/compiler.js |  2 +-
 src/exec.js     |  6 ++++--
 src/gencode.js  | 10 +++++++---
 3 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/src/compiler.js b/src/compiler.js
index 9b12507..ddbba6b 100644
--- a/src/compiler.js
+++ b/src/compiler.js
@@ -31,7 +31,7 @@ module.exports = compile;
 
 const parser = require("../parser/jaz.js").parser;
 
-const timeout = ms => new Promise(res => setTimeout(res, ms))
+const timeout = ms => new Promise(res => setTimeout(res, ms));
 
 async function compile(srcFile) {
     const fullFileName = srcFile;
diff --git a/src/exec.js b/src/exec.js
index ecca341..bb85621 100644
--- a/src/exec.js
+++ b/src/exec.js
@@ -578,8 +578,10 @@ function execIf(ctx, ast) {
         exec(ctx, ast.then);
         if (ctx.error) return;
     } else {
-        exec(ctx, ast.else);
-        if (ctx.error) return;
+        if (ast.else) {
+            exec(ctx, ast.else);
+            if (ctx.error) return;
+        }
     }
 }
 
diff --git a/src/gencode.js b/src/gencode.js
index 3fbe8e0..0c3b5c2 100644
--- a/src/gencode.js
+++ b/src/gencode.js
@@ -246,9 +246,13 @@ function genIf(ctx, ast) {
     if (ctx.error) return;
     const thenBody = gen(ctx, ast.then);
     if (ctx.error) return;
-    const elseBody = gen(ctx, ast.else);
-    if (ctx.error) return;
-    return `if (${condition}) {\n${thenBody}\n} else {\n${elseBody}\n}\n`;
+    if (ast.else) {
+        const elseBody = gen(ctx, ast.else);
+        if (ctx.error) return;
+        return `if (${condition}) {\n${thenBody}\n} else {\n${elseBody}\n}\n`;
+    } else {
+        return `if (${condition}) {\n${thenBody}\n}\n`;
+    }
 }