Add while statements

grammar.coffee

@@ -72,6 +72,7 @@ module.exports = grammar
       @return_statement,
       @if_statement,
       @for_statement,
+      @while_statement,
       @expression_statement,
       @statement_block),
 
@@ -99,6 +100,11 @@ module.exports = grammar
       ")",
       @statement)
 
+    while_statement: -> seq(
+      keyword("while"),
+      "(", @expression, ")",
+      @statement)
+
     type: -> seq(
       optional(keyword("const")),
       choice(

grammar_test/statements.txt

@@ -77,3 +77,19 @@ int main() {
       (function_call (identifier))
       (function_call (identifier))
       (expression_statement (identifier)))))
+
+============================================
+While loops
+============================================
+
+int main() {
+  while (x)
+    printf("hi");
+}
+
+---
+
+(function_declaration (identifier) (identifier) (formal_parameters)
+  (statement_block
+    (while_statement (identifier)
+      (expression_statement (function_call (identifier) (string))))))