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Add test for custom deriving plugins which rely on field attributes
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// Copyright 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. | ||
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// force-host | ||
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#![feature(plugin_registrar)] | ||
#![feature(box_syntax)] | ||
#![feature(rustc_private)] | ||
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extern crate syntax; | ||
extern crate rustc; | ||
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use syntax::ast; | ||
use syntax::attr::AttrMetaMethods; | ||
use syntax::codemap::Span; | ||
use syntax::ext::base::{Decorator, ExtCtxt}; | ||
use syntax::ext::build::AstBuilder; | ||
use syntax::ext::deriving::generic::{cs_fold, TraitDef, MethodDef, combine_substructure}; | ||
use syntax::ext::deriving::generic::{Substructure, Struct, EnumMatching}; | ||
use syntax::ext::deriving::generic::ty::{Literal, LifetimeBounds, Path, borrowed_explicit_self}; | ||
use syntax::parse::token; | ||
use syntax::ptr::P; | ||
use rustc::plugin::Registry; | ||
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#[plugin_registrar] | ||
pub fn plugin_registrar(reg: &mut Registry) { | ||
reg.register_syntax_extension( | ||
token::intern("derive_TotalSum"), | ||
Decorator(box expand)); | ||
} | ||
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fn expand(cx: &mut ExtCtxt, | ||
span: Span, | ||
mitem: &ast::MetaItem, | ||
item: &ast::Item, | ||
push: &mut FnMut(P<ast::Item>)) { | ||
let trait_def = TraitDef { | ||
span: span, | ||
attributes: vec![], | ||
path: Path::new(vec!["TotalSum"]), | ||
additional_bounds: vec![], | ||
generics: LifetimeBounds::empty(), | ||
associated_types: vec![], | ||
methods: vec![ | ||
MethodDef { | ||
name: "total_sum", | ||
generics: LifetimeBounds::empty(), | ||
explicit_self: borrowed_explicit_self(), | ||
args: vec![], | ||
ret_ty: Literal(Path::new_local("isize")), | ||
attributes: vec![], | ||
combine_substructure: combine_substructure(Box::new(totalsum_substructure)), | ||
}, | ||
], | ||
}; | ||
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trait_def.expand(cx, mitem, item, push) | ||
} | ||
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// Mostly copied from syntax::ext::deriving::hash | ||
/// Defines how the implementation for `trace()` is to be generated | ||
fn totalsum_substructure(cx: &mut ExtCtxt, trait_span: Span, substr: &Substructure) -> P<ast::Expr> { | ||
let fields = match *substr.fields { | ||
Struct(ref fs) | EnumMatching(_, _, ref fs) => fs, | ||
_ => cx.span_bug(trait_span, "impossible substructure") | ||
}; | ||
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fields.iter().fold(cx.expr_int(trait_span, 0), |acc, ref item| { | ||
if item.attrs.iter().find(|a| a.check_name("ignore")).is_some() { | ||
acc | ||
} else { | ||
cx.expr_binary(item.span, ast::BiAdd, acc, | ||
cx.expr_method_call(item.span, | ||
item.self_.clone(), | ||
substr.method_ident, | ||
Vec::new())) | ||
} | ||
}) | ||
} |
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// Copyright 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. | ||
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// aux-build:custom_derive_plugin_attr.rs | ||
// ignore-stage1 | ||
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#![feature(plugin, custom_derive, custom_attribute)] | ||
#![plugin(custom_derive_plugin_attr)] | ||
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trait TotalSum { | ||
fn total_sum(&self) -> isize; | ||
} | ||
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impl TotalSum for isize { | ||
fn total_sum(&self) -> isize { | ||
*self | ||
} | ||
} | ||
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struct Seven; | ||
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impl TotalSum for Seven { | ||
fn total_sum(&self) -> isize { | ||
7 | ||
} | ||
} | ||
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#[derive(TotalSum)] | ||
struct Foo { | ||
seven: Seven, | ||
bar: Bar, | ||
baz: isize, | ||
#[ignore] | ||
nan: NaN, | ||
} | ||
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#[derive(TotalSum)] | ||
struct Bar { | ||
quux: isize, | ||
bleh: isize, | ||
#[ignore] | ||
nan: NaN2 | ||
} | ||
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struct NaN; | ||
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impl TotalSum for NaN { | ||
fn total_sum(&self) -> isize { | ||
panic!(); | ||
} | ||
} | ||
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struct NaN2; | ||
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pub fn main() { | ||
let v = Foo { | ||
seven: Seven, | ||
bar: Bar { | ||
quux: 9, | ||
bleh: 3, | ||
nan: NaN2 | ||
}, | ||
baz: 80, | ||
nan: NaN | ||
}; | ||
assert_eq!(v.total_sum(), 99); | ||
} |