generate: support nested records. (#138)

generate: support nested records.

Author: eddyb

macros/tests/basic.rs

@@ -199,6 +199,8 @@ testcases![
             Bar:{ "a" field:"b"? } |
             Baz:{ baz:"ab" };
     }:
+    A("a") => "\
+1:1-1:2 => A::Bar",
     A("ab") => "\
 1:1-1:3 => A::Foo(
     1:1-1:3,
@@ -207,4 +209,46 @@ testcases![
 } | A::Baz {
     baz: 1:1-1:3,
 }";
+
+    nested_records {
+        A = "a" nested:{ b:"b" c:"c"* d:"d"? } list:{ e:"e"? "f" }* "g";
+    }:
+    A("abg") => "\
+1:1-1:4 => A {
+    nested: 1:2-1:3 => {
+        b: 1:2-1:3,
+        c: 1:3-1:3 => [],
+        d: None,
+    },
+    list: 1:3-1:3 => [],
+}",
+    A("abcccdeffefg") => "\
+1:1-1:13 => A {
+    nested: 1:2-1:7 => {
+        b: 1:2-1:3,
+        c: 1:3-1:6 => [
+            1:3-1:4,
+            1:4-1:5,
+            1:5-1:6,
+        ],
+        d: Some(
+            1:6-1:7,
+        ),
+    },
+    list: 1:7-1:12 => [
+        1:7-1:9 => {
+            e: Some(
+                1:7-1:8,
+            ),
+        },
+        1:9-1:10 => {
+            e: None,
+        },
+        1:10-1:12 => {
+            e: Some(
+                1:10-1:11,
+            ),
+        },
+    ],
+}";
 ];