Merge pull request rust-lang#3080 from topecongiro/issue-3031

Format macro calls with item-like arguments

src/macros.rs

@@ -44,6 +44,7 @@ use shape::{Indent, Shape};
 use source_map::SpanUtils;
 use spanned::Spanned;
 use utils::{format_visibility, mk_sp, rewrite_ident, wrap_str};
+use visitor::FmtVisitor;
 
 const FORCED_BRACKET_MACROS: &[&str] = &["vec!"];
 
@@ -63,6 +64,15 @@ pub enum MacroArg {
     Item(ptr::P<ast::Item>),
 }
 
+impl MacroArg {
+    fn is_item(&self) -> bool {
+        match self {
+            MacroArg::Item(..) => true,
+            _ => false,
+        }
+    }
+}
+
 impl Rewrite for ast::Item {
     fn rewrite(&self, context: &RewriteContext, shape: Shape) -> Option<String> {
         let mut visitor = ::visitor::FmtVisitor::from_context(context);
@@ -259,6 +269,7 @@ pub fn rewrite_macro_inner(
                     }
                     return return_original_snippet_with_failure_marked(context, mac.span);
                 }
+                _ if arg_vec.last().map_or(false, MacroArg::is_item) => continue,
                 _ => return return_original_snippet_with_failure_marked(context, mac.span),
             }
 
@@ -271,6 +282,18 @@ pub fn rewrite_macro_inner(
         }
     }
 
+    if !arg_vec.is_empty() && arg_vec.iter().all(MacroArg::is_item) {
+        return rewrite_macro_with_items(
+            context,
+            &arg_vec,
+            &macro_name,
+            shape,
+            style,
+            position,
+            mac.span,
+        );
+    }
+
     match style {
         DelimToken::Paren => {
             // Format macro invocation as function call, preserve the trailing
@@ -1428,3 +1451,45 @@ fn format_lazy_static(context: &RewriteContext, shape: Shape, ts: &TokenStream)
 
     Some(result)
 }
+
+fn rewrite_macro_with_items(
+    context: &RewriteContext,
+    items: &[MacroArg],
+    macro_name: &str,
+    shape: Shape,
+    style: DelimToken,
+    position: MacroPosition,
+    span: Span,
+) -> Option<String> {
+    let (opener, closer) = match style {
+        DelimToken::Paren => ("(", ")"),
+        DelimToken::Bracket => ("[", "]"),
+        DelimToken::Brace => (" {", "}"),
+        _ => return None,
+    };
+    let trailing_semicolon = match style {
+        DelimToken::Paren | DelimToken::Bracket if position == MacroPosition::Item => ";",
+        _ => "",
+    };
+
+    let mut visitor = FmtVisitor::from_context(context);
+    visitor.block_indent = shape.indent.block_indent(context.config);
+    visitor.last_pos = context.snippet_provider.span_after(span, opener.trim());
+    for item in items {
+        let item = match item {
+            MacroArg::Item(item) => item,
+            _ => return None,
+        };
+        visitor.visit_item(&item);
+    }
+
+    let mut result = String::with_capacity(256);
+    result.push_str(&macro_name);
+    result.push_str(opener);
+    result.push_str(&visitor.block_indent.to_string_with_newline(context.config));
+    result.push_str(visitor.buffer.trim());
+    result.push_str(&shape.indent.to_string_with_newline(context.config));
+    result.push_str(closer);
+    result.push_str(trailing_semicolon);
+    return Some(result);
+}

tests/source/macros.rs

@@ -426,3 +426,29 @@ named!(
 
 // #2857
 convert_args!(vec!(1, 2, 3));
+
+// #3031
+thread_local!(
+/// TLV Holds a set of JSTraceables that need to be rooted
+    static ROOTED_TRACEABLES: RefCell<RootedTraceableSet> =
+        RefCell::new(RootedTraceableSet::new()) ;
+) ;
+
+thread_local![
+    /// TLV Holds a set of JSTraceables that need to be rooted
+    static ROOTED_TRACEABLES: RefCell<RootedTraceableSet> =
+        RefCell::new(RootedTraceableSet::new()) ;
+
+    /// TLV Holds a set of JSTraceables that need to be rooted
+    static ROOTED_TRACEABLES: RefCell<RootedTraceableSet> =
+        RefCell::new(RootedTraceableSet::new(0)) ;
+
+    /// TLV Holds a set of JSTraceables that need to be rooted
+    static ROOTED_TRACEABLES: RefCell<RootedTraceableSet> =
+        RefCell::new(RootedTraceableSet::new(), xxx, yyy) ;
+
+    /// TLV Holds a set of JSTraceables that need to be rooted
+static ROOTED_TRACEABLES: RefCell<RootedTraceableSet> =
+        RefCell::new(RootedTraceableSet::new(1234)) ;
+
+] ;

tests/target/issue-2523.rs

@@ -11,7 +11,9 @@
 // Format items that appear as arguments of macro call.
 //! ```rust
 //! let x = 3;
-//! some_macro!(pub fn foo() {
-//!     println!("Don't unindent me!");
-//! });
+//! some_macro!(
+//!     pub fn foo() {
+//!         println!("Don't unindent me!");
+//!     }
+//! );
 //! ```

tests/target/macros.rs

@@ -1007,3 +1007,26 @@ named!(
 
 // #2857
 convert_args!(vec!(1, 2, 3));
+
+// #3031
+thread_local!(
+    /// TLV Holds a set of JSTraceables that need to be rooted
+    static ROOTED_TRACEABLES: RefCell<RootedTraceableSet> = RefCell::new(RootedTraceableSet::new());
+);
+
+thread_local![
+    /// TLV Holds a set of JSTraceables that need to be rooted
+    static ROOTED_TRACEABLES: RefCell<RootedTraceableSet> = RefCell::new(RootedTraceableSet::new());
+
+    /// TLV Holds a set of JSTraceables that need to be rooted
+    static ROOTED_TRACEABLES: RefCell<RootedTraceableSet> =
+        RefCell::new(RootedTraceableSet::new(0));
+
+    /// TLV Holds a set of JSTraceables that need to be rooted
+    static ROOTED_TRACEABLES: RefCell<RootedTraceableSet> =
+        RefCell::new(RootedTraceableSet::new(), xxx, yyy);
+
+    /// TLV Holds a set of JSTraceables that need to be rooted
+    static ROOTED_TRACEABLES: RefCell<RootedTraceableSet> =
+        RefCell::new(RootedTraceableSet::new(1234));
+];