Add binary operators

.gitignore

@@ -3,6 +3,8 @@ node_modules
 build
 *.gyp
 
+bindings/*
+
 # see https://stackoverflow.com/a/5534865
 !src/
 src/*

corpus/branch.txt

@@ -0,0 +1,81 @@
+===
+Simple branch 1
+===
+
+if ( $true ) { }
+
+---
+
+(program
+  (if_statement
+    (pipeline_statement
+      (variable
+        (simple_variable)))))
+
+===
+Simple branch 2
+===
+
+if ( $true )
+{
+}
+
+---
+
+(program
+  (if_statement
+    (pipeline_statement
+      (variable
+        (simple_variable)))))
+
+===
+Simple branch 3
+===
+
+if($true){
+}
+
+---
+
+(program
+  (if_statement
+    (pipeline_statement
+      (variable
+        (simple_variable)))))
+
+===
+Simple branch 4
+===
+
+if ( $true ) { } else { }
+
+---
+
+(program
+  (if_statement
+   (pipeline_statement
+     (variable
+       (simple_variable)))
+  (else_statement))
+)
+
+===
+Simple branch 5
+===
+
+if ( $true ) {
+}
+elseif ( $true ) {
+}
+else {
+}
+
+---
+
+(program
+  (if_statement
+   (pipeline_statement
+     (variable
+       (simple_variable))))
+)
+