Marko v3: allow more than two args for builder.concat(...)

compiler/Builder.js

@@ -103,11 +103,23 @@ class Builder {
         return new Code({value});
     }
 
-    concat(left, right) {
-        left = makeNode(left);
-        right = makeNode(right);
+    concat(args) {
+        var prev;
         let operator = '+';
-        return new BinaryExpression({left, operator, right});
+
+        for (var i=1; i<arguments.length; i++) {
+            var left;
+            var right = makeNode(arguments[i]);
+            if (i === 1) {
+                left = makeNode(arguments[i-1]);
+            } else {
+                left = prev;
+            }
+
+            prev = new BinaryExpression({left, operator, right});
+        }
+
+        return prev;
     }
 
     conditionalExpression(test, consequent, alternate) {

test/fixtures/codegen/autotest/concat-four/expected.js

@@ -0,0 +1 @@
+((a + b) + c) + d

test/fixtures/codegen/autotest/concat-four/index.js

@@ -0,0 +1,9 @@
+'use strict';
+
+module.exports = function(builder) {
+    return builder.concat(
+        builder.identifier('a'),
+        builder.identifier('b'),
+        builder.identifier('c'),
+        builder.identifier('d'));
+};

test/fixtures/codegen/autotest/concat-three/expected.js

@@ -0,0 +1 @@
+(a + b) + c

test/fixtures/codegen/autotest/concat-three/index.js

@@ -0,0 +1,8 @@
+'use strict';
+
+module.exports = function(builder) {
+    return builder.concat(
+        builder.identifier('a'),
+        builder.identifier('b'),
+        builder.identifier('c'));
+};

test/fixtures/codegen/autotest/concat/expected.js

@@ -0,0 +1 @@
+a + b

test/fixtures/codegen/autotest/concat/index.js

@@ -0,0 +1,7 @@
+'use strict';
+
+module.exports = function(builder) {
+    return builder.concat(
+        builder.identifier('a'),
+        builder.identifier('b'));
+};