128 lines
4.3 KiB
Rust
128 lines
4.3 KiB
Rust
// Copyright 2012-2013 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::{MetaItem, Item, Expr};
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use codemap::Span;
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use ext::base::ExtCtxt;
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use ext::build::AstBuilder;
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use ext::deriving::generic::*;
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pub fn expand_deriving_clone(cx: &ExtCtxt,
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span: Span,
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mitem: @MetaItem,
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in_items: ~[@Item])
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-> ~[@Item] {
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let trait_def = TraitDef {
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cx: cx, span: span,
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path: Path::new(~["std", "clone", "Clone"]),
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additional_bounds: ~[],
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generics: LifetimeBounds::empty(),
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methods: ~[
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MethodDef {
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name: "clone",
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generics: LifetimeBounds::empty(),
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explicit_self: borrowed_explicit_self(),
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args: ~[],
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ret_ty: Self,
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inline: true,
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const_nonmatching: false,
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combine_substructure: |c, s, sub| cs_clone("Clone", c, s, sub)
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}
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]
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};
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trait_def.expand(mitem, in_items)
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}
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pub fn expand_deriving_deep_clone(cx: &ExtCtxt,
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span: Span,
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mitem: @MetaItem,
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in_items: ~[@Item])
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-> ~[@Item] {
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let trait_def = TraitDef {
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cx: cx, span: span,
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path: Path::new(~["std", "clone", "DeepClone"]),
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additional_bounds: ~[],
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generics: LifetimeBounds::empty(),
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methods: ~[
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MethodDef {
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name: "deep_clone",
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generics: LifetimeBounds::empty(),
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explicit_self: borrowed_explicit_self(),
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args: ~[],
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ret_ty: Self,
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inline: true,
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const_nonmatching: false,
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// cs_clone uses the ident passed to it, i.e. it will
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// call deep_clone (not clone) here.
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combine_substructure: |c, s, sub| cs_clone("DeepClone", c, s, sub)
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}
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]
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};
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trait_def.expand(mitem, in_items)
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}
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fn cs_clone(
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name: &str,
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cx: &ExtCtxt, span: Span,
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substr: &Substructure) -> @Expr {
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let clone_ident = substr.method_ident;
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let ctor_ident;
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let all_fields;
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let subcall = |field|
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cx.expr_method_call(span, field, clone_ident, ~[]);
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match *substr.fields {
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Struct(ref af) => {
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ctor_ident = substr.type_ident;
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all_fields = af;
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}
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EnumMatching(_, variant, ref af) => {
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ctor_ident = variant.node.name;
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all_fields = af;
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},
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EnumNonMatching(..) => cx.span_bug(span,
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format!("Non-matching enum variants in `deriving({})`",
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name)),
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StaticEnum(..) | StaticStruct(..) => cx.span_bug(span,
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format!("Static method in `deriving({})`",
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name))
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}
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match *all_fields {
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[FieldInfo { name: None, .. }, ..] => {
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// enum-like
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let subcalls = all_fields.map(|field| subcall(field.self_));
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cx.expr_call_ident(span, ctor_ident, subcalls)
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},
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_ => {
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// struct-like
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let fields = all_fields.map(|field| {
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let ident = match field.name {
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Some(i) => i,
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None => cx.span_bug(span,
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format!("unnamed field in normal struct in `deriving({})`",
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name))
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};
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cx.field_imm(span, ident, subcall(field.self_))
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});
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if fields.is_empty() {
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// no fields, so construct like `None`
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cx.expr_ident(span, ctor_ident)
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} else {
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cx.expr_struct_ident(span, ctor_ident, fields)
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}
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}
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}
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}
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