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libsyntax: miscellaneous cleanup #33943

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merged 5 commits into from
Jun 28, 2016
Merged

libsyntax: miscellaneous cleanup #33943

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01a0877
Remove inherent method `attrs()` on AST nodes. `attrs()` is now a met…
jseyfried May 24, 2016
febe6a4
Refactor away field `ctxt` of `ast::Mac_`
jseyfried May 24, 2016
5bf7970
Change `fold_tt` and `fold_tts` to take token trees by value (instead…
jseyfried Jun 3, 2016
683e480
Refactor away `WithAttrs` trait
jseyfried Jun 10, 2016
0644aba
Remove the type parameter from `syntax::visit::Visitor`
jseyfried Jun 12, 2016
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15 changes: 0 additions & 15 deletions src/libsyntax/attr.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -889,21 +889,6 @@ pub trait HasAttrs: Sized {
fn map_attrs<F: FnOnce(Vec<ast::Attribute>) -> Vec<ast::Attribute>>(self, f: F) -> Self;
}

/// A cheap way to add Attributes to an AST node.
pub trait WithAttrs {
// FIXME: Could be extended to anything IntoIter<Item=Attribute>
fn with_attrs(self, attrs: ThinAttributes) -> Self;
}

impl<T: HasAttrs> WithAttrs for T {
fn with_attrs(self, attrs: ThinAttributes) -> Self {
self.map_attrs(|mut orig_attrs| {
orig_attrs.extend(attrs.into_attr_vec());
orig_attrs
})
}
}

impl HasAttrs for Vec<Attribute> {
fn attrs(&self) -> &[Attribute] {
&self
Expand Down
39 changes: 15 additions & 24 deletions src/libsyntax/ext/expand.rs
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Expand Up @@ -14,9 +14,8 @@ use ast::{MacStmtStyle, Mrk, Stmt, StmtKind, ItemKind};
use ast::TokenTree;
use ast;
use ext::mtwt;
use ext::build::AstBuilder;
use attr;
use attr::{AttrMetaMethods, WithAttrs, ThinAttributesExt};
use attr::{AttrMetaMethods, ThinAttributesExt};
use codemap;
use codemap::{Span, Spanned, ExpnInfo, ExpnId, NameAndSpan, MacroBang, MacroAttribute};
use config::StripUnconfigured;
Expand Down Expand Up @@ -87,19 +86,18 @@ impl MacroGenerable for Option<P<ast::Expr>> {
}
}

pub fn expand_expr(expr: ast::Expr, fld: &mut MacroExpander) -> P<ast::Expr> {
pub fn expand_expr(mut expr: ast::Expr, fld: &mut MacroExpander) -> P<ast::Expr> {
match expr.node {
// expr_mac should really be expr_ext or something; it's the
// entry-point for all syntax extensions.
ast::ExprKind::Mac(mac) => {
expand_mac_invoc(mac, None, expr.attrs.into_attr_vec(), expr.span, fld)
return expand_mac_invoc(mac, None, expr.attrs.into_attr_vec(), expr.span, fld);
}

ast::ExprKind::While(cond, body, opt_ident) => {
let cond = fld.fold_expr(cond);
let (body, opt_ident) = expand_loop_block(body, opt_ident, fld);
fld.cx.expr(expr.span, ast::ExprKind::While(cond, body, opt_ident))
.with_attrs(fold_thin_attrs(expr.attrs, fld))
expr.node = ast::ExprKind::While(cond, body, opt_ident);
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fold_thin_attrs became the identity after this commit.

}

ast::ExprKind::WhileLet(pat, cond, body, opt_ident) => {
Expand All @@ -116,14 +114,12 @@ pub fn expand_expr(expr: ast::Expr, fld: &mut MacroExpander) -> P<ast::Expr> {
});
assert!(rewritten_pats.len() == 1);

let wl = ast::ExprKind::WhileLet(rewritten_pats.remove(0), cond, body, opt_ident);
fld.cx.expr(expr.span, wl).with_attrs(fold_thin_attrs(expr.attrs, fld))
expr.node = ast::ExprKind::WhileLet(rewritten_pats.remove(0), cond, body, opt_ident);
}

ast::ExprKind::Loop(loop_block, opt_ident) => {
let (loop_block, opt_ident) = expand_loop_block(loop_block, opt_ident, fld);
fld.cx.expr(expr.span, ast::ExprKind::Loop(loop_block, opt_ident))
.with_attrs(fold_thin_attrs(expr.attrs, fld))
expr.node = ast::ExprKind::Loop(loop_block, opt_ident);
}

ast::ExprKind::ForLoop(pat, head, body, opt_ident) => {
Expand All @@ -140,8 +136,7 @@ pub fn expand_expr(expr: ast::Expr, fld: &mut MacroExpander) -> P<ast::Expr> {
assert!(rewritten_pats.len() == 1);

let head = fld.fold_expr(head);
let fl = ast::ExprKind::ForLoop(rewritten_pats.remove(0), head, body, opt_ident);
fld.cx.expr(expr.span, fl).with_attrs(fold_thin_attrs(expr.attrs, fld))
expr.node = ast::ExprKind::ForLoop(rewritten_pats.remove(0), head, body, opt_ident);
}

ast::ExprKind::IfLet(pat, sub_expr, body, else_opt) => {
Expand All @@ -159,25 +154,21 @@ pub fn expand_expr(expr: ast::Expr, fld: &mut MacroExpander) -> P<ast::Expr> {

let else_opt = else_opt.map(|else_opt| fld.fold_expr(else_opt));
let sub_expr = fld.fold_expr(sub_expr);
let il = ast::ExprKind::IfLet(rewritten_pats.remove(0), sub_expr, body, else_opt);
fld.cx.expr(expr.span, il).with_attrs(fold_thin_attrs(expr.attrs, fld))
expr.node = ast::ExprKind::IfLet(rewritten_pats.remove(0), sub_expr, body, else_opt);
}

ast::ExprKind::Closure(capture_clause, fn_decl, block, fn_decl_span) => {
let (rewritten_fn_decl, rewritten_block)
= expand_and_rename_fn_decl_and_block(fn_decl, block, fld);
let new_node = ast::ExprKind::Closure(capture_clause,
rewritten_fn_decl,
rewritten_block,
fn_decl_span);
P(ast::Expr{ id: expr.id,
node: new_node,
span: expr.span,
attrs: fold_thin_attrs(expr.attrs, fld) })
expr.node = ast::ExprKind::Closure(capture_clause,
rewritten_fn_decl,
rewritten_block,
fn_decl_span);
}

_ => P(noop_fold_expr(expr, fld)),
}
_ => expr = noop_fold_expr(expr, fld),
};
P(expr)
}

/// Expand a macro invocation. Returns the result of expansion.
Expand Down