Add boolean operators

grammar.coffee

@@ -97,6 +97,7 @@ module.exports = compiler.grammar
       @member_access,
       @subscript_access,
       @function_call,
+      @bool_op,
       @math_op,
       @rel_op,
       @assignment,
@@ -161,6 +162,10 @@ module.exports = compiler.grammar
       /\d+/,
       optional(seq(".", /\d+/))))
 
+    bool_op: -> choice(
+      seq(@expression, "&&", @expression),
+      seq(@expression, "||", @expression))
+
     math_op: -> choice(
       seq(@expression, "++"),
       seq(@expression, "--"),

grammar_test/expressions.txt

@@ -171,6 +171,19 @@ i - j;
   (expression_statement (math_op (identifier) (identifier)))
   (expression_statement (math_op (identifier) (identifier))))
 
+============================================
+Boolean operators
+============================================
+
+i || j;
+i && j;
+
+---
+
+(program
+  (expression_statement (bool_op (identifier) (identifier)))
+  (expression_statement (bool_op (identifier) (identifier))))
+
 ============================================
 Relational operators
 ============================================