Add compound literals

grammar.coffee

@@ -191,6 +191,7 @@ module.exports = grammar
       @function_call,
       @field_access,
       @deref_field_access,
+      @compound_literal,
       @number,
       @char,
       @string)
@@ -234,6 +235,15 @@ module.exports = grammar
       "=",
       @expression)
 
+    compound_literal: -> seq(
+      "(", @type, ")",
+      "{", commaSep(choice(@struct_literal_field, @expression)), optional(","), "}")
+
+    struct_literal_field: -> seq(
+      ".", @identifier,
+      "=",
+      @expression)
+
     number: -> /\d+(\.\d+)?/
 
     char: -> token(seq(

grammar_test/expressions.txt

@@ -120,3 +120,26 @@ int main() {
     (expression_statement (assignment (field_access (identifier) (identifier)) (number)))
     (expression_statement (assignment (deref_field_access (identifier) (identifier)) (number)))))
 
+============================================
+Compound literals
+============================================
+
+int main() {
+  x = (SomeType) { .field1 = 5, .field2 = 6 };
+  y = (struct SomeStruct) { 7, 8 };
+}
+
+---
+
+(function_declaration (identifier) (identifier) (formal_parameters)
+  (statement_block
+    (expression_statement (assignment
+      (identifier)
+      (compound_literal (identifier)
+        (struct_literal_field (identifier) (number))
+        (struct_literal_field (identifier) (number)))))
+    (expression_statement (assignment
+      (identifier)
+      (compound_literal (struct_type (identifier))
+        (number)
+        (number))))))