Add switch statements

grammar.coffee

@@ -18,7 +18,9 @@ module.exports = compiler.grammar
     statement: -> choice(
       @expression_statement,
       @if_statement,
+      @switch_statement,
       @for_statement,
+      @break_statement,
       @statement_block,
       @return_statement,
       @var_declaration)
@@ -31,6 +33,30 @@ module.exports = compiler.grammar
       "(", @expression, ")",
       @statement)
 
+    switch_statement: -> seq(
+      keyword("switch"),
+      "(",
+      @expression,
+      ")",
+      "{",
+      repeat(choice(@case, @default))
+      "}")
+
+    case: -> seq(
+      keyword("case"),
+      @expression,
+      ":",
+      repeat(@statement))
+
+    default: -> seq(
+      keyword("default"),
+      ":",
+      repeat(@statement))
+
+    break_statement: -> seq(
+      keyword("break"),
+      terminator())
+
     for_statement: -> seq(
       keyword("for"),
       "(",

grammar_test/statements.txt

@@ -118,3 +118,32 @@ var x = y
   (return_statement (number))
   (var_declaration (identifier) (identifier)))
 
+============================================
+Switch statements
+============================================
+
+switch (x) {
+  case 1:
+  case 2:
+    something();
+    break;
+  case "three":
+    somethingElse();
+    break;
+  default:
+    return 4;
+}
+
+---
+
+(program
+  (switch_statement (identifier)
+    (case (number))
+    (case (number)
+      (expression_statement (function_call (identifier)))
+      (break_statement))
+    (case (string)
+      (expression_statement (function_call (identifier)))
+      (break_statement))
+    (default
+      (return_statement (number)))))