791 lines
29 KiB
Rust
791 lines
29 KiB
Rust
// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use ast::{Block, Crate, Ident, Mac_, PatKind};
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use ast::{MacStmtStyle, StmtKind, ItemKind};
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use ast;
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use ext::hygiene::Mark;
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use ext::placeholders::{self, placeholder, PlaceholderExpander};
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use attr::{self, HasAttrs};
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use codemap::{ExpnInfo, NameAndSpan, MacroBang, MacroAttribute};
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use syntax_pos::{self, Span, ExpnId};
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use config::StripUnconfigured;
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use ext::base::*;
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use feature_gate::{self, Features};
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use fold;
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use fold::*;
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use parse::token::{intern, keywords};
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use ptr::P;
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use tokenstream::TokenTree;
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use util::small_vector::SmallVector;
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use visit::Visitor;
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use std::mem;
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use std::path::PathBuf;
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use std::rc::Rc;
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macro_rules! expansions {
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($($kind:ident: $ty:ty [$($vec:ident, $ty_elt:ty)*], $kind_name:expr, .$make:ident,
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$(.$fold:ident)* $(lift .$fold_elt:ident)*,
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$(.$visit:ident)* $(lift .$visit_elt:ident)*;)*) => {
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#[derive(Copy, Clone)]
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pub enum ExpansionKind { OptExpr, $( $kind, )* }
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pub enum Expansion { OptExpr(Option<P<ast::Expr>>), $( $kind($ty), )* }
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impl ExpansionKind {
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fn name(self) -> &'static str {
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match self {
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ExpansionKind::OptExpr => "expression",
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$( ExpansionKind::$kind => $kind_name, )*
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}
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}
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fn make_from<'a>(self, result: Box<MacResult + 'a>) -> Option<Expansion> {
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match self {
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ExpansionKind::OptExpr => result.make_expr().map(Some).map(Expansion::OptExpr),
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$( ExpansionKind::$kind => result.$make().map(Expansion::$kind), )*
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}
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}
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}
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impl Expansion {
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pub fn make_opt_expr(self) -> Option<P<ast::Expr>> {
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match self {
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Expansion::OptExpr(expr) => expr,
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_ => panic!("Expansion::make_* called on the wrong kind of expansion"),
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}
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}
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$( pub fn $make(self) -> $ty {
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match self {
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Expansion::$kind(ast) => ast,
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_ => panic!("Expansion::make_* called on the wrong kind of expansion"),
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}
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} )*
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pub fn fold_with<F: Folder>(self, folder: &mut F) -> Self {
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use self::Expansion::*;
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match self {
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OptExpr(expr) => OptExpr(expr.and_then(|expr| folder.fold_opt_expr(expr))),
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$($( $kind(ast) => $kind(folder.$fold(ast)), )*)*
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$($( $kind(ast) => {
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$kind(ast.into_iter().flat_map(|ast| folder.$fold_elt(ast)).collect())
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}, )*)*
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}
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}
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pub fn visit_with<V: Visitor>(&self, visitor: &mut V) {
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match *self {
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Expansion::OptExpr(Some(ref expr)) => visitor.visit_expr(expr),
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Expansion::OptExpr(None) => {}
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$($( Expansion::$kind(ref ast) => visitor.$visit(ast), )*)*
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$($( Expansion::$kind(ref ast) => for ast in ast.as_slice() {
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visitor.$visit_elt(ast);
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}, )*)*
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}
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}
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}
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impl<'a, 'b> Folder for MacroExpander<'a, 'b> {
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fn fold_opt_expr(&mut self, expr: P<ast::Expr>) -> Option<P<ast::Expr>> {
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self.expand(Expansion::OptExpr(Some(expr))).make_opt_expr()
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}
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$($(fn $fold(&mut self, node: $ty) -> $ty {
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self.expand(Expansion::$kind(node)).$make()
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})*)*
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$($(fn $fold_elt(&mut self, node: $ty_elt) -> $ty {
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self.expand(Expansion::$kind(SmallVector::one(node))).$make()
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})*)*
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}
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}
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}
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expansions! {
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Expr: P<ast::Expr> [], "expression", .make_expr, .fold_expr, .visit_expr;
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Pat: P<ast::Pat> [], "pattern", .make_pat, .fold_pat, .visit_pat;
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Ty: P<ast::Ty> [], "type", .make_ty, .fold_ty, .visit_ty;
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Stmts: SmallVector<ast::Stmt> [SmallVector, ast::Stmt],
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"statement", .make_stmts, lift .fold_stmt, lift .visit_stmt;
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Items: SmallVector<P<ast::Item>> [SmallVector, P<ast::Item>],
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"item", .make_items, lift .fold_item, lift .visit_item;
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TraitItems: SmallVector<ast::TraitItem> [SmallVector, ast::TraitItem],
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"trait item", .make_trait_items, lift .fold_trait_item, lift .visit_trait_item;
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ImplItems: SmallVector<ast::ImplItem> [SmallVector, ast::ImplItem],
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"impl item", .make_impl_items, lift .fold_impl_item, lift .visit_impl_item;
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}
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impl ExpansionKind {
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fn dummy(self, span: Span) -> Expansion {
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self.make_from(DummyResult::any(span)).unwrap()
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}
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fn expect_from_annotatables<I: IntoIterator<Item = Annotatable>>(self, items: I) -> Expansion {
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let items = items.into_iter();
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match self {
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ExpansionKind::Items =>
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Expansion::Items(items.map(Annotatable::expect_item).collect()),
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ExpansionKind::ImplItems =>
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Expansion::ImplItems(items.map(Annotatable::expect_impl_item).collect()),
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ExpansionKind::TraitItems =>
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Expansion::TraitItems(items.map(Annotatable::expect_trait_item).collect()),
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_ => unreachable!(),
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}
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}
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}
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pub struct Invocation {
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pub kind: InvocationKind,
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expansion_kind: ExpansionKind,
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expansion_data: ExpansionData,
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}
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pub enum InvocationKind {
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Bang {
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attrs: Vec<ast::Attribute>,
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mac: ast::Mac,
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ident: Option<Ident>,
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span: Span,
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},
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Attr {
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attr: ast::Attribute,
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item: Annotatable,
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},
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}
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impl Invocation {
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fn span(&self) -> Span {
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match self.kind {
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InvocationKind::Bang { span, .. } => span,
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InvocationKind::Attr { ref attr, .. } => attr.span,
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}
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}
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pub fn mark(&self) -> Mark {
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self.expansion_data.mark
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}
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}
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pub struct MacroExpander<'a, 'b:'a> {
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pub cx: &'a mut ExtCtxt<'b>,
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pub single_step: bool,
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pub keep_macs: bool,
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}
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impl<'a, 'b> MacroExpander<'a, 'b> {
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pub fn new(cx: &'a mut ExtCtxt<'b>,
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single_step: bool,
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keep_macs: bool) -> MacroExpander<'a, 'b> {
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MacroExpander {
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cx: cx,
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single_step: single_step,
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keep_macs: keep_macs
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}
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}
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fn expand_crate(&mut self, mut krate: ast::Crate) -> ast::Crate {
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let err_count = self.cx.parse_sess.span_diagnostic.err_count();
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let items = Expansion::Items(SmallVector::many(krate.module.items));
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krate.module.items = self.expand(items).make_items().into();
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krate.exported_macros = mem::replace(&mut self.cx.exported_macros, Vec::new());
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for def in &mut krate.exported_macros {
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def.id = self.cx.resolver.next_node_id()
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}
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if self.cx.parse_sess.span_diagnostic.err_count() > err_count {
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self.cx.parse_sess.span_diagnostic.abort_if_errors();
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}
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krate
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}
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// Fully expand all the invocations in `expansion`.
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fn expand(&mut self, expansion: Expansion) -> Expansion {
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let orig_expansion_data = self.cx.current_expansion.clone();
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self.cx.current_expansion.depth = 0;
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let (expansion, mut invocations) = self.collect_invocations(expansion);
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invocations.reverse();
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let mut expansions = vec![vec![(0, expansion)]];
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while let Some(invoc) = invocations.pop() {
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let ExpansionData { depth, mark, .. } = invoc.expansion_data;
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self.cx.current_expansion = invoc.expansion_data.clone();
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let expansion = match self.cx.resolver.resolve_invoc(&invoc) {
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Some(ext) => self.expand_invoc(invoc, ext),
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None => invoc.expansion_kind.dummy(invoc.span()),
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};
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self.cx.current_expansion.depth = depth + 1;
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let (expansion, new_invocations) = self.collect_invocations(expansion);
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if expansions.len() == depth {
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expansions.push(Vec::new());
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}
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expansions[depth].push((mark.as_u32(), expansion));
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if !self.single_step {
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invocations.extend(new_invocations.into_iter().rev());
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}
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}
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self.cx.current_expansion = orig_expansion_data;
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let mut placeholder_expander = PlaceholderExpander::new(self.cx);
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while let Some(expansions) = expansions.pop() {
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for (mark, expansion) in expansions.into_iter().rev() {
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let expansion = expansion.fold_with(&mut placeholder_expander);
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placeholder_expander.add(mark, expansion);
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}
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}
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placeholder_expander.remove(0)
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}
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fn collect_invocations(&mut self, expansion: Expansion) -> (Expansion, Vec<Invocation>) {
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let crate_config = mem::replace(&mut self.cx.cfg, Vec::new());
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let result = {
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let mut collector = InvocationCollector {
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cfg: StripUnconfigured {
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config: &crate_config,
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should_test: self.cx.ecfg.should_test,
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sess: self.cx.parse_sess,
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features: self.cx.ecfg.features,
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},
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cx: self.cx,
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invocations: Vec::new(),
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};
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(expansion.fold_with(&mut collector), collector.invocations)
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};
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self.cx.cfg = crate_config;
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let mark = self.cx.current_expansion.mark;
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self.cx.resolver.visit_expansion(mark, &result.0);
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result
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}
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fn expand_invoc(&mut self, invoc: Invocation, ext: Rc<SyntaxExtension>) -> Expansion {
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match invoc.kind {
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InvocationKind::Bang { .. } => self.expand_bang_invoc(invoc, ext),
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InvocationKind::Attr { .. } => self.expand_attr_invoc(invoc, ext),
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}
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}
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fn expand_attr_invoc(&mut self, invoc: Invocation, ext: Rc<SyntaxExtension>) -> Expansion {
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let Invocation { expansion_kind: kind, .. } = invoc;
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let (attr, item) = match invoc.kind {
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InvocationKind::Attr { attr, item } => (attr, item),
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_ => unreachable!(),
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};
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attr::mark_used(&attr);
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self.cx.bt_push(ExpnInfo {
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call_site: attr.span,
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callee: NameAndSpan {
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format: MacroAttribute(intern(&attr.name())),
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span: Some(attr.span),
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allow_internal_unstable: false,
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}
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});
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match *ext {
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MultiModifier(ref mac) => {
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let item = mac.expand(self.cx, attr.span, &attr.node.value, item);
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kind.expect_from_annotatables(item)
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}
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MultiDecorator(ref mac) => {
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let mut items = Vec::new();
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mac.expand(self.cx, attr.span, &attr.node.value, &item,
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&mut |item| items.push(item));
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items.push(item);
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kind.expect_from_annotatables(items)
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}
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_ => unreachable!(),
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}
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}
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/// Expand a macro invocation. Returns the result of expansion.
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fn expand_bang_invoc(&mut self, invoc: Invocation, ext: Rc<SyntaxExtension>) -> Expansion {
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let (mark, kind) = (invoc.mark(), invoc.expansion_kind);
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let (attrs, mac, ident, span) = match invoc.kind {
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InvocationKind::Bang { attrs, mac, ident, span } => (attrs, mac, ident, span),
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_ => unreachable!(),
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};
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let Mac_ { path, tts, .. } = mac.node;
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// Detect use of feature-gated or invalid attributes on macro invoations
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// since they will not be detected after macro expansion.
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for attr in attrs.iter() {
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feature_gate::check_attribute(&attr, &self.cx.parse_sess.span_diagnostic,
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&self.cx.parse_sess.codemap(),
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&self.cx.ecfg.features.unwrap());
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}
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if path.segments.len() > 1 || path.global || !path.segments[0].parameters.is_empty() {
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self.cx.span_err(path.span, "expected macro name without module separators");
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return kind.dummy(span);
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}
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let extname = path.segments[0].identifier.name;
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let ident = ident.unwrap_or(keywords::Invalid.ident());
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let marked_tts = mark_tts(&tts, mark);
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let opt_expanded = match *ext {
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NormalTT(ref expandfun, exp_span, allow_internal_unstable) => {
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if ident.name != keywords::Invalid.name() {
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let msg =
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format!("macro {}! expects no ident argument, given '{}'", extname, ident);
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self.cx.span_err(path.span, &msg);
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return kind.dummy(span);
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}
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self.cx.bt_push(ExpnInfo {
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call_site: span,
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callee: NameAndSpan {
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format: MacroBang(extname),
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span: exp_span,
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allow_internal_unstable: allow_internal_unstable,
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},
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});
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kind.make_from(expandfun.expand(self.cx, span, &marked_tts))
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}
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IdentTT(ref expander, tt_span, allow_internal_unstable) => {
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if ident.name == keywords::Invalid.name() {
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self.cx.span_err(path.span,
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&format!("macro {}! expects an ident argument", extname));
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return kind.dummy(span);
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};
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self.cx.bt_push(ExpnInfo {
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call_site: span,
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callee: NameAndSpan {
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format: MacroBang(extname),
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span: tt_span,
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allow_internal_unstable: allow_internal_unstable,
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}
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});
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kind.make_from(expander.expand(self.cx, span, ident, marked_tts))
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}
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MacroRulesTT => {
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if ident.name == keywords::Invalid.name() {
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self.cx.span_err(path.span,
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&format!("macro {}! expects an ident argument", extname));
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return kind.dummy(span);
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};
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self.cx.bt_push(ExpnInfo {
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call_site: span,
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callee: NameAndSpan {
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format: MacroBang(extname),
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span: None,
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// `macro_rules!` doesn't directly allow unstable
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// (this is orthogonal to whether the macro it creates allows it)
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allow_internal_unstable: false,
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}
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});
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let def = ast::MacroDef {
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ident: ident,
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id: ast::DUMMY_NODE_ID,
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span: span,
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imported_from: None,
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use_locally: true,
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body: marked_tts,
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export: attr::contains_name(&attrs, "macro_export"),
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allow_internal_unstable: attr::contains_name(&attrs, "allow_internal_unstable"),
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attrs: attrs,
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};
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self.cx.insert_macro(def.clone());
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// If keep_macs is true, expands to a MacEager::items instead.
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if self.keep_macs {
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Some(placeholders::reconstructed_macro_rules(&def, &path))
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} else {
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Some(placeholders::macro_scope_placeholder())
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}
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}
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MultiDecorator(..) | MultiModifier(..) => {
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self.cx.span_err(path.span,
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&format!("`{}` can only be used in attributes", extname));
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return kind.dummy(span);
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}
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};
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let expanded = if let Some(expanded) = opt_expanded {
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expanded
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} else {
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let msg = format!("non-{kind} macro in {kind} position: {name}",
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name = path.segments[0].identifier.name, kind = kind.name());
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self.cx.span_err(path.span, &msg);
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return kind.dummy(span);
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};
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expanded.fold_with(&mut Marker {
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mark: mark,
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expn_id: Some(self.cx.backtrace()),
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})
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}
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}
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struct InvocationCollector<'a, 'b: 'a> {
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cx: &'a mut ExtCtxt<'b>,
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cfg: StripUnconfigured<'a>,
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invocations: Vec<Invocation>,
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}
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macro_rules! fully_configure {
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($this:ident, $node:ident, $noop_fold:ident) => {
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match $noop_fold($node, &mut $this.cfg).pop() {
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Some(node) => node,
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None => return SmallVector::zero(),
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}
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}
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}
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impl<'a, 'b> InvocationCollector<'a, 'b> {
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fn collect(&mut self, expansion_kind: ExpansionKind, kind: InvocationKind) -> Expansion {
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let mark = Mark::fresh();
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self.invocations.push(Invocation {
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kind: kind,
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expansion_kind: expansion_kind,
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expansion_data: ExpansionData { mark: mark, ..self.cx.current_expansion.clone() },
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});
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placeholder(expansion_kind, mark.as_u32())
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}
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fn collect_bang(
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&mut self, mac: ast::Mac, attrs: Vec<ast::Attribute>, span: Span, kind: ExpansionKind,
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) -> Expansion {
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self.collect(kind, InvocationKind::Bang { attrs: attrs, mac: mac, ident: None, span: span })
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}
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fn collect_attr(&mut self, attr: ast::Attribute, item: Annotatable, kind: ExpansionKind)
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-> Expansion {
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self.collect(kind, InvocationKind::Attr { attr: attr, item: item })
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}
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// If `item` is an attr invocation, remove and return the macro attribute.
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fn classify_item<T: HasAttrs>(&mut self, mut item: T) -> (T, Option<ast::Attribute>) {
|
|
let mut attr = None;
|
|
item = item.map_attrs(|mut attrs| {
|
|
attr = self.cx.resolver.find_attr_invoc(&mut attrs);
|
|
attrs
|
|
});
|
|
(item, attr)
|
|
}
|
|
|
|
fn configure<T: HasAttrs>(&mut self, node: T) -> Option<T> {
|
|
self.cfg.configure(node)
|
|
}
|
|
}
|
|
|
|
impl<'a, 'b> Folder for InvocationCollector<'a, 'b> {
|
|
fn fold_expr(&mut self, expr: P<ast::Expr>) -> P<ast::Expr> {
|
|
let mut expr = self.cfg.configure_expr(expr).unwrap();
|
|
expr.node = self.cfg.configure_expr_kind(expr.node);
|
|
|
|
if let ast::ExprKind::Mac(mac) = expr.node {
|
|
self.collect_bang(mac, expr.attrs.into(), expr.span, ExpansionKind::Expr).make_expr()
|
|
} else {
|
|
P(noop_fold_expr(expr, self))
|
|
}
|
|
}
|
|
|
|
fn fold_opt_expr(&mut self, expr: P<ast::Expr>) -> Option<P<ast::Expr>> {
|
|
let mut expr = configure!(self, expr).unwrap();
|
|
expr.node = self.cfg.configure_expr_kind(expr.node);
|
|
|
|
if let ast::ExprKind::Mac(mac) = expr.node {
|
|
self.collect_bang(mac, expr.attrs.into(), expr.span, ExpansionKind::OptExpr)
|
|
.make_opt_expr()
|
|
} else {
|
|
Some(P(noop_fold_expr(expr, self)))
|
|
}
|
|
}
|
|
|
|
fn fold_pat(&mut self, pat: P<ast::Pat>) -> P<ast::Pat> {
|
|
match pat.node {
|
|
PatKind::Mac(_) => {}
|
|
_ => return noop_fold_pat(pat, self),
|
|
}
|
|
|
|
pat.and_then(|pat| match pat.node {
|
|
PatKind::Mac(mac) =>
|
|
self.collect_bang(mac, Vec::new(), pat.span, ExpansionKind::Pat).make_pat(),
|
|
_ => unreachable!(),
|
|
})
|
|
}
|
|
|
|
fn fold_stmt(&mut self, stmt: ast::Stmt) -> SmallVector<ast::Stmt> {
|
|
let stmt = match self.cfg.configure_stmt(stmt) {
|
|
Some(stmt) => stmt,
|
|
None => return SmallVector::zero(),
|
|
};
|
|
|
|
let (mac, style, attrs) = if let StmtKind::Mac(mac) = stmt.node {
|
|
mac.unwrap()
|
|
} else {
|
|
// The placeholder expander gives ids to statements, so we avoid folding the id here.
|
|
let ast::Stmt { id, node, span } = stmt;
|
|
return noop_fold_stmt_kind(node, self).into_iter().map(|node| {
|
|
ast::Stmt { id: id, node: node, span: span }
|
|
}).collect()
|
|
};
|
|
|
|
let mut placeholder =
|
|
self.collect_bang(mac, attrs.into(), stmt.span, ExpansionKind::Stmts).make_stmts();
|
|
|
|
// If this is a macro invocation with a semicolon, then apply that
|
|
// semicolon to the final statement produced by expansion.
|
|
if style == MacStmtStyle::Semicolon {
|
|
if let Some(stmt) = placeholder.pop() {
|
|
placeholder.push(stmt.add_trailing_semicolon());
|
|
}
|
|
}
|
|
|
|
placeholder
|
|
}
|
|
|
|
fn fold_block(&mut self, block: P<Block>) -> P<Block> {
|
|
let orig_in_block = mem::replace(&mut self.cx.current_expansion.in_block, true);
|
|
let result = noop_fold_block(block, self);
|
|
self.cx.current_expansion.in_block = orig_in_block;
|
|
result
|
|
}
|
|
|
|
fn fold_item(&mut self, item: P<ast::Item>) -> SmallVector<P<ast::Item>> {
|
|
let item = configure!(self, item);
|
|
|
|
let (item, attr) = self.classify_item(item);
|
|
if let Some(attr) = attr {
|
|
let item = Annotatable::Item(fully_configure!(self, item, noop_fold_item));
|
|
return self.collect_attr(attr, item, ExpansionKind::Items).make_items();
|
|
}
|
|
|
|
match item.node {
|
|
ast::ItemKind::Mac(..) => {
|
|
if match item.node {
|
|
ItemKind::Mac(ref mac) => mac.node.path.segments.is_empty(),
|
|
_ => unreachable!(),
|
|
} {
|
|
return SmallVector::one(item);
|
|
}
|
|
|
|
item.and_then(|item| match item.node {
|
|
ItemKind::Mac(mac) => {
|
|
self.collect(ExpansionKind::Items, InvocationKind::Bang {
|
|
mac: mac,
|
|
attrs: item.attrs,
|
|
ident: Some(item.ident),
|
|
span: item.span,
|
|
}).make_items()
|
|
}
|
|
_ => unreachable!(),
|
|
})
|
|
}
|
|
ast::ItemKind::Mod(ast::Mod { inner, .. }) => {
|
|
let mut module = (*self.cx.current_expansion.module).clone();
|
|
module.mod_path.push(item.ident);
|
|
|
|
// Detect if this is an inline module (`mod m { ... }` as opposed to `mod m;`).
|
|
// In the non-inline case, `inner` is never the dummy span (c.f. `parse_item_mod`).
|
|
// Thus, if `inner` is the dummy span, we know the module is inline.
|
|
let inline_module = item.span.contains(inner) || inner == syntax_pos::DUMMY_SP;
|
|
|
|
if inline_module {
|
|
module.directory.push(&*{
|
|
::attr::first_attr_value_str_by_name(&item.attrs, "path")
|
|
.unwrap_or(item.ident.name.as_str())
|
|
});
|
|
} else {
|
|
module.directory =
|
|
PathBuf::from(self.cx.parse_sess.codemap().span_to_filename(inner));
|
|
module.directory.pop();
|
|
}
|
|
|
|
let orig_module =
|
|
mem::replace(&mut self.cx.current_expansion.module, Rc::new(module));
|
|
let result = noop_fold_item(item, self);
|
|
self.cx.current_expansion.module = orig_module;
|
|
return result;
|
|
}
|
|
ast::ItemKind::ExternCrate(..) => {
|
|
// We need to error on `#[macro_use] extern crate` when it isn't at the
|
|
// crate root, because `$crate` won't work properly.
|
|
let is_crate_root = self.cx.current_expansion.module.mod_path.len() == 1;
|
|
for def in self.cx.resolver.load_crate(&*item, is_crate_root) {
|
|
match def {
|
|
LoadedMacro::Def(def) => self.cx.insert_macro(def),
|
|
LoadedMacro::CustomDerive(name, ext) => {
|
|
self.cx.insert_custom_derive(&name, ext, item.span);
|
|
}
|
|
}
|
|
}
|
|
noop_fold_item(item, self)
|
|
},
|
|
_ => noop_fold_item(item, self),
|
|
}
|
|
}
|
|
|
|
fn fold_trait_item(&mut self, item: ast::TraitItem) -> SmallVector<ast::TraitItem> {
|
|
let item = configure!(self, item);
|
|
|
|
let (item, attr) = self.classify_item(item);
|
|
if let Some(attr) = attr {
|
|
let item =
|
|
Annotatable::TraitItem(P(fully_configure!(self, item, noop_fold_trait_item)));
|
|
return self.collect_attr(attr, item, ExpansionKind::TraitItems).make_trait_items()
|
|
}
|
|
|
|
match item.node {
|
|
ast::TraitItemKind::Macro(mac) => {
|
|
let ast::TraitItem { attrs, span, .. } = item;
|
|
self.collect_bang(mac, attrs, span, ExpansionKind::TraitItems).make_trait_items()
|
|
}
|
|
_ => fold::noop_fold_trait_item(item, self),
|
|
}
|
|
}
|
|
|
|
fn fold_impl_item(&mut self, item: ast::ImplItem) -> SmallVector<ast::ImplItem> {
|
|
let item = configure!(self, item);
|
|
|
|
let (item, attr) = self.classify_item(item);
|
|
if let Some(attr) = attr {
|
|
let item = Annotatable::ImplItem(P(fully_configure!(self, item, noop_fold_impl_item)));
|
|
return self.collect_attr(attr, item, ExpansionKind::ImplItems).make_impl_items();
|
|
}
|
|
|
|
match item.node {
|
|
ast::ImplItemKind::Macro(mac) => {
|
|
let ast::ImplItem { attrs, span, .. } = item;
|
|
self.collect_bang(mac, attrs, span, ExpansionKind::ImplItems).make_impl_items()
|
|
}
|
|
_ => fold::noop_fold_impl_item(item, self),
|
|
}
|
|
}
|
|
|
|
fn fold_ty(&mut self, ty: P<ast::Ty>) -> P<ast::Ty> {
|
|
let ty = match ty.node {
|
|
ast::TyKind::Mac(_) => ty.unwrap(),
|
|
_ => return fold::noop_fold_ty(ty, self),
|
|
};
|
|
|
|
match ty.node {
|
|
ast::TyKind::Mac(mac) =>
|
|
self.collect_bang(mac, Vec::new(), ty.span, ExpansionKind::Ty).make_ty(),
|
|
_ => unreachable!(),
|
|
}
|
|
}
|
|
|
|
fn fold_foreign_mod(&mut self, foreign_mod: ast::ForeignMod) -> ast::ForeignMod {
|
|
noop_fold_foreign_mod(self.cfg.configure_foreign_mod(foreign_mod), self)
|
|
}
|
|
|
|
fn fold_item_kind(&mut self, item: ast::ItemKind) -> ast::ItemKind {
|
|
noop_fold_item_kind(self.cfg.configure_item_kind(item), self)
|
|
}
|
|
|
|
fn new_id(&mut self, id: ast::NodeId) -> ast::NodeId {
|
|
assert_eq!(id, ast::DUMMY_NODE_ID);
|
|
self.cx.resolver.next_node_id()
|
|
}
|
|
}
|
|
|
|
pub struct ExpansionConfig<'feat> {
|
|
pub crate_name: String,
|
|
pub features: Option<&'feat Features>,
|
|
pub recursion_limit: usize,
|
|
pub trace_mac: bool,
|
|
pub should_test: bool, // If false, strip `#[test]` nodes
|
|
}
|
|
|
|
macro_rules! feature_tests {
|
|
($( fn $getter:ident = $field:ident, )*) => {
|
|
$(
|
|
pub fn $getter(&self) -> bool {
|
|
match self.features {
|
|
Some(&Features { $field: true, .. }) => true,
|
|
_ => false,
|
|
}
|
|
}
|
|
)*
|
|
}
|
|
}
|
|
|
|
impl<'feat> ExpansionConfig<'feat> {
|
|
pub fn default(crate_name: String) -> ExpansionConfig<'static> {
|
|
ExpansionConfig {
|
|
crate_name: crate_name,
|
|
features: None,
|
|
recursion_limit: 64,
|
|
trace_mac: false,
|
|
should_test: false,
|
|
}
|
|
}
|
|
|
|
feature_tests! {
|
|
fn enable_quotes = quote,
|
|
fn enable_asm = asm,
|
|
fn enable_log_syntax = log_syntax,
|
|
fn enable_concat_idents = concat_idents,
|
|
fn enable_trace_macros = trace_macros,
|
|
fn enable_allow_internal_unstable = allow_internal_unstable,
|
|
fn enable_custom_derive = custom_derive,
|
|
fn enable_pushpop_unsafe = pushpop_unsafe,
|
|
fn enable_rustc_macro = rustc_macro,
|
|
}
|
|
}
|
|
|
|
pub fn expand_crate(cx: &mut ExtCtxt,
|
|
user_exts: Vec<NamedSyntaxExtension>,
|
|
c: Crate) -> Crate {
|
|
cx.initialize(user_exts, &c);
|
|
cx.expander().expand_crate(c)
|
|
}
|
|
|
|
// Expands crate using supplied MacroExpander - allows for
|
|
// non-standard expansion behaviour (e.g. step-wise).
|
|
pub fn expand_crate_with_expander(expander: &mut MacroExpander,
|
|
user_exts: Vec<NamedSyntaxExtension>,
|
|
c: Crate) -> Crate {
|
|
expander.cx.initialize(user_exts, &c);
|
|
expander.expand_crate(c)
|
|
}
|
|
|
|
// A Marker adds the given mark to the syntax context and
|
|
// sets spans' `expn_id` to the given expn_id (unless it is `None`).
|
|
struct Marker { mark: Mark, expn_id: Option<ExpnId> }
|
|
|
|
impl Folder for Marker {
|
|
fn fold_ident(&mut self, mut ident: Ident) -> Ident {
|
|
ident.ctxt = ident.ctxt.apply_mark(self.mark);
|
|
ident
|
|
}
|
|
fn fold_mac(&mut self, mac: ast::Mac) -> ast::Mac {
|
|
noop_fold_mac(mac, self)
|
|
}
|
|
|
|
fn new_span(&mut self, mut span: Span) -> Span {
|
|
if let Some(expn_id) = self.expn_id {
|
|
span.expn_id = expn_id;
|
|
}
|
|
span
|
|
}
|
|
}
|
|
|
|
// apply a given mark to the given token trees. Used prior to expansion of a macro.
|
|
fn mark_tts(tts: &[TokenTree], m: Mark) -> Vec<TokenTree> {
|
|
noop_fold_tts(tts, &mut Marker{mark:m, expn_id: None})
|
|
}
|