Test compound tokens.

Author: jseyfried

src/test/run-pass-fulldeps/proc-macro/auxiliary/count_compound_ops.rs

@@ -0,0 +1,36 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// no-prefer-dynamic
+
+#![feature(proc_macro)]
+#![crate_type = "proc-macro"]
+
+extern crate proc_macro;
+
+use proc_macro::{TokenStream, TokenKind, OpKind, Literal, quote};
+
+#[proc_macro]
+pub fn count_compound_ops(input: TokenStream) -> TokenStream {
+    assert_eq!(count_compound_ops_helper(quote!(++ (&&) 4@a)), 3);
+    TokenKind::Literal(Literal::u32(count_compound_ops_helper(input))).into()
+}
+
+fn count_compound_ops_helper(input: TokenStream) -> u32 {
+    let mut count = 0;
+    for token in input {
+        match token.kind {
+            TokenKind::Op(c, OpKind::Alone) => count += 1,
+            TokenKind::Sequence(_, tokens) => count += count_compound_ops_helper(tokens),
+            _ => {}
+        }
+    }
+    count
+}

src/test/run-pass-fulldeps/proc-macro/count_compound_ops.rs

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+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// aux-build:count_compound_ops.rs
+
+#![feature(proc_macro)]
+
+extern crate count_compound_ops;
+use count_compound_ops::count_compound_ops;
+
+fn main() {
+    assert_eq!(count_compound_ops!(foo<=>bar <<<! -baz ++), 4);
+}