1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
// Copyright 2013-2015 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.
// force-host
#![feature(plugin_registrar, quote)]
#![feature(box_syntax, rustc_private)]
extern crate syntax;
extern crate rustc;
use syntax::ast::{self, TokenTree, Item, MetaItem};
use syntax::codemap::Span;
use syntax::ext::base::*;
use syntax::parse::token;
use syntax::parse;
use syntax::ptr::P;
use rustc::plugin::Registry;
#[macro_export]
macro_rules! exported_macro { () => (2) }
macro_rules! unexported_macro { () => (3) }
#[plugin_registrar]
pub fn plugin_registrar(reg: &mut Registry) {
reg.register_macro("make_a_1", expand_make_a_1);
reg.register_macro("forged_ident", expand_forged_ident);
reg.register_macro("identity", expand_identity);
reg.register_syntax_extension(
token::intern("into_foo"),
// FIXME (#22405): Replace `Box::new` with `box` here when/if possible.
Modifier(Box::new(expand_into_foo)));
reg.register_syntax_extension(
token::intern("into_multi_foo"),
// FIXME (#22405): Replace `Box::new` with `box` here when/if possible.
MultiModifier(Box::new(expand_into_foo_multi)));
}
fn expand_make_a_1(cx: &mut ExtCtxt, sp: Span, tts: &[TokenTree])
-> Box<MacResult+'static> {
if !tts.is_empty() {
cx.span_fatal(sp, "make_a_1 takes no arguments");
}
MacEager::expr(quote_expr!(cx, 1))
}
// See Issue #15750
fn expand_identity(cx: &mut ExtCtxt, _span: Span, tts: &[TokenTree])
-> Box<MacResult+'static> {
// Parse an expression and emit it unchanged.
let mut parser = parse::new_parser_from_tts(cx.parse_sess(),
cx.cfg(), tts.to_vec());
let expr = parser.parse_expr();
MacEager::expr(quote_expr!(&mut *cx, $expr))
}
fn expand_into_foo(cx: &mut ExtCtxt, sp: Span, attr: &MetaItem, it: P<Item>)
-> P<Item> {
P(Item {
attrs: it.attrs.clone(),
..(*quote_item!(cx, enum Foo { Bar, Baz }).unwrap()).clone()
})
}
fn expand_into_foo_multi(cx: &mut ExtCtxt,
sp: Span,
attr: &MetaItem,
it: Annotatable) -> Annotatable {
match it {
Annotatable::Item(it) => {
Annotatable::Item(P(Item {
attrs: it.attrs.clone(),
..(*quote_item!(cx, enum Foo2 { Bar2, Baz2 }).unwrap()).clone()
}))
}
Annotatable::ImplItem(it) => {
quote_item!(cx, impl X { fn foo(&self) -> i32 { 42 } }).unwrap().and_then(|i| {
match i.node {
ast::ItemImpl(_, _, _, _, _, mut items) => {
Annotatable::ImplItem(items.pop().expect("impl method not found"))
}
_ => unreachable!("impl parsed to something other than impl")
}
})
}
Annotatable::TraitItem(it) => {
quote_item!(cx, trait X { fn foo(&self) -> i32 { 0 } }).unwrap().and_then(|i| {
match i.node {
ast::ItemTrait(_, _, _, mut items) => {
Annotatable::TraitItem(items.pop().expect("trait method not found"))
}
_ => unreachable!("trait parsed to something other than trait")
}
})
}
}
}
fn expand_forged_ident(cx: &mut ExtCtxt, sp: Span, tts: &[TokenTree]) -> Box<MacResult+'static> {
use syntax::ext::quote::rt::*;
if !tts.is_empty() {
cx.span_fatal(sp, "forged_ident takes no arguments");
}
// Most of this is modelled after the expansion of the `quote_expr!`
// macro ...
let parse_sess = cx.parse_sess();
let cfg = cx.cfg();
// ... except this is where we inject a forged identifier,
// and deliberately do not call `cx.parse_tts_with_hygiene`
// (because we are testing that this will be *rejected*
// by the default parser).
let expr = {
let tt = cx.parse_tts("\x00name_2,ctxt_0\x00".to_string());
let mut parser = new_parser_from_tts(parse_sess, cfg, tt);
parser.parse_expr()
};
MacEager::expr(expr)
}
pub fn foo() {}
|
