874 lines
34 KiB
Rust
874 lines
34 KiB
Rust
// Copyright 2012 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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/// The compiler code necessary to implement the #[deriving_eq] and
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/// #[deriving_iter_bytes] extensions.
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use core::prelude::*;
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use ast;
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use ast::{TraitTyParamBound, Ty, and, bind_by_ref, binop, deref, enum_def};
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use ast::{enum_variant_kind, expr, expr_match, ident, item, item_};
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use ast::{item_enum, item_impl, item_struct, m_imm, meta_item, method};
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use ast::{named_field, or, pat, pat_ident, pat_wild, public, pure_fn};
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use ast::{re_anon, stmt, struct_def, struct_variant_kind};
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use ast::{sty_by_ref, sty_region, tuple_variant_kind, ty_nil, ty_param};
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use ast::{ty_param_bound, ty_path, ty_rptr, unnamed_field, variant};
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use ext::base::ext_ctxt;
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use ext::build;
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use codemap::{span, spanned};
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use parse::token::special_idents::clownshoes_extensions;
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use core::dvec;
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use core::uint;
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enum Junction {
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Conjunction,
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Disjunction,
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}
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impl Junction {
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fn to_binop(self) -> binop {
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match self {
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Conjunction => and,
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Disjunction => or,
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}
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}
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}
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type ExpandDerivingStructDefFn = &fn(ext_ctxt,
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span,
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x: &struct_def,
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ident,
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+y: ~[ty_param])
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-> @item;
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type ExpandDerivingEnumDefFn = &fn(ext_ctxt,
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span,
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x: &enum_def,
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ident,
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+y: ~[ty_param])
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-> @item;
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pub fn expand_deriving_eq(cx: ext_ctxt,
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span: span,
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_mitem: meta_item,
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in_items: ~[@item])
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-> ~[@item] {
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expand_deriving(cx,
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span,
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in_items,
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expand_deriving_eq_struct_def,
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expand_deriving_eq_enum_def)
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}
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pub fn expand_deriving_iter_bytes(cx: ext_ctxt,
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span: span,
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_mitem: meta_item,
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in_items: ~[@item])
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-> ~[@item] {
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expand_deriving(cx,
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span,
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in_items,
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expand_deriving_iter_bytes_struct_def,
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expand_deriving_iter_bytes_enum_def)
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}
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fn expand_deriving(cx: ext_ctxt,
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span: span,
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in_items: ~[@item],
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expand_deriving_struct_def: ExpandDerivingStructDefFn,
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expand_deriving_enum_def: ExpandDerivingEnumDefFn)
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-> ~[@item] {
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let result = dvec::DVec();
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for in_items.each |item| {
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result.push(copy *item);
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match item.node {
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item_struct(struct_def, copy ty_params) => {
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result.push(expand_deriving_struct_def(cx,
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span,
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struct_def,
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item.ident,
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move ty_params));
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}
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item_enum(ref enum_definition, copy ty_params) => {
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result.push(expand_deriving_enum_def(cx,
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span,
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enum_definition,
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item.ident,
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move ty_params));
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}
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_ => ()
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}
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}
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dvec::unwrap(move result)
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}
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fn create_impl_item(cx: ext_ctxt, span: span, +item: item_) -> @item {
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@ast::item {
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ident: clownshoes_extensions,
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attrs: ~[],
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id: cx.next_id(),
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node: move item,
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vis: public,
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span: span,
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}
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}
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/// Creates a method from the given expression, the signature of which
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/// conforms to the `eq` or `ne` method.
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fn create_eq_method(cx: ext_ctxt,
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span: span,
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method_ident: ident,
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type_ident: ident,
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ty_params: &[ty_param],
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body: @expr)
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-> @method {
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// Create the type of the `other` parameter.
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let arg_path_type = create_self_type_with_params(cx,
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span,
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type_ident,
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ty_params);
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let arg_region = @ast::region { id: cx.next_id(), node: re_anon };
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let arg_type = ty_rptr(
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arg_region,
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ast::mt { ty: arg_path_type, mutbl: m_imm }
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);
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let arg_type = @ast::Ty {
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id: cx.next_id(),
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node: arg_type,
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span: span,
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};
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// Create the `other` parameter.
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let other_ident = cx.ident_of(~"__other");
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let arg = build::mk_arg(cx, span, other_ident, arg_type);
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// Create the type of the return value.
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let bool_ident = cx.ident_of(~"bool");
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let output_type = build::mk_raw_path(span, ~[ bool_ident ]);
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let output_type = ty_path(output_type, cx.next_id());
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let output_type = @ast::Ty {
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id: cx.next_id(),
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node: output_type,
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span: span,
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};
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// Create the function declaration.
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let fn_decl = build::mk_fn_decl(~[ move arg ], output_type);
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// Create the body block.
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let body_block = build::mk_simple_block(cx, span, body);
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// Create the method.
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let self_ty = spanned { node: sty_region(m_imm), span: span };
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@ast::method {
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ident: method_ident,
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attrs: ~[],
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tps: ~[],
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self_ty: self_ty,
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purity: pure_fn,
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decl: move fn_decl,
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body: move body_block,
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id: cx.next_id(),
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span: span,
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self_id: cx.next_id(),
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vis: public
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}
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}
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fn create_self_type_with_params(cx: ext_ctxt,
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span: span,
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type_ident: ident,
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ty_params: &[ty_param])
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-> @Ty {
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// Create the type parameters on the `self` path.
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let self_ty_params = dvec::DVec();
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for ty_params.each |ty_param| {
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let self_ty_param = build::mk_simple_ty_path(cx,
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span,
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ty_param.ident);
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self_ty_params.push(move self_ty_param);
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}
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let self_ty_params = dvec::unwrap(move self_ty_params);
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// Create the type of `self`.
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let self_type = build::mk_raw_path_(span,
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~[ type_ident ],
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move self_ty_params);
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let self_type = ty_path(self_type, cx.next_id());
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@ast::Ty { id: cx.next_id(), node: self_type, span: span }
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}
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fn create_derived_impl(cx: ext_ctxt,
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span: span,
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type_ident: ident,
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+ty_params: ~[ty_param],
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methods: &[@method],
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trait_path: &[ident])
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-> @item {
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// Create the type parameters.
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let impl_ty_params = dvec::DVec();
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for ty_params.each |ty_param| {
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let bound = build::mk_ty_path_global(cx,
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span,
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trait_path.map(|x| *x));
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let bounds = @~[ TraitTyParamBound(bound) ];
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let impl_ty_param = build::mk_ty_param(cx, ty_param.ident, bounds);
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impl_ty_params.push(move impl_ty_param);
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}
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let impl_ty_params = dvec::unwrap(move impl_ty_params);
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// Create the reference to the trait.
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let trait_path = ast::path {
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span: span,
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global: true,
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idents: trait_path.map(|x| *x),
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rp: None,
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types: ~[]
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};
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let trait_path = @move trait_path;
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let trait_ref = ast::trait_ref {
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path: trait_path,
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ref_id: cx.next_id()
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};
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let trait_ref = @move trait_ref;
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// Create the type of `self`.
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let self_type = create_self_type_with_params(cx,
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span,
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type_ident,
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ty_params);
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// Create the impl item.
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let impl_item = item_impl(move impl_ty_params,
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Some(trait_ref),
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self_type,
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methods.map(|x| *x));
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return create_impl_item(cx, span, move impl_item);
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}
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fn create_derived_eq_impl(cx: ext_ctxt,
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span: span,
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type_ident: ident,
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+ty_params: ~[ty_param],
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eq_method: @method,
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ne_method: @method)
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-> @item {
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let methods = [ eq_method, ne_method ];
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let trait_path = [
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cx.ident_of(~"core"),
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cx.ident_of(~"cmp"),
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cx.ident_of(~"Eq")
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];
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create_derived_impl(cx, span, type_ident, ty_params, methods, trait_path)
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}
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fn create_derived_iter_bytes_impl(cx: ext_ctxt,
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span: span,
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type_ident: ident,
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+ty_params: ~[ty_param],
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method: @method)
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-> @item {
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let methods = [ method ];
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let trait_path = [
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cx.ident_of(~"core"),
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cx.ident_of(~"to_bytes"),
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cx.ident_of(~"IterBytes")
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];
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create_derived_impl(cx, span, type_ident, ty_params, methods, trait_path)
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}
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// Creates a method from the given set of statements conforming to the
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// signature of the `iter_bytes` method.
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fn create_iter_bytes_method(cx: ext_ctxt,
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span: span,
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+statements: ~[@stmt])
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-> @method {
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// Create the `lsb0` parameter.
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let bool_ident = cx.ident_of(~"bool");
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let lsb0_arg_type = build::mk_simple_ty_path(cx, span, bool_ident);
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let lsb0_ident = cx.ident_of(~"__lsb0");
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let lsb0_arg = build::mk_arg(cx, span, lsb0_ident, lsb0_arg_type);
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// Create the `f` parameter.
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let core_ident = cx.ident_of(~"core");
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let to_bytes_ident = cx.ident_of(~"to_bytes");
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let cb_ident = cx.ident_of(~"Cb");
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let core_to_bytes_cb_ident = ~[ core_ident, to_bytes_ident, cb_ident ];
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let f_arg_type = build::mk_ty_path(cx, span, core_to_bytes_cb_ident);
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let f_ident = cx.ident_of(~"__f");
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let f_arg = build::mk_arg(cx, span, f_ident, f_arg_type);
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// Create the type of the return value.
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let output_type = @ast::Ty { id: cx.next_id(), node: ty_nil, span: span };
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// Create the function declaration.
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let inputs = ~[ move lsb0_arg, move f_arg ];
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let fn_decl = build::mk_fn_decl(move inputs, output_type);
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// Create the body block.
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let body_block = build::mk_block_(cx, span, move statements);
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// Create the method.
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let self_ty = spanned { node: sty_region(m_imm), span: span };
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let method_ident = cx.ident_of(~"iter_bytes");
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@ast::method {
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ident: method_ident,
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attrs: ~[],
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tps: ~[],
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self_ty: self_ty,
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purity: pure_fn,
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decl: move fn_decl,
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body: move body_block,
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id: cx.next_id(),
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span: span,
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self_id: cx.next_id(),
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vis: public
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}
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}
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fn create_subpatterns(cx: ext_ctxt,
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span: span,
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prefix: ~str,
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n: uint)
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-> ~[@pat] {
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let subpats = dvec::DVec();
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for uint::range(0, n) |_i| {
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// Create the subidentifier.
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let index = subpats.len().to_str();
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let ident = cx.ident_of(prefix + index);
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// Create the subpattern.
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let subpath = build::mk_raw_path(span, ~[ ident ]);
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let subpat = pat_ident(bind_by_ref(m_imm), subpath, None);
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let subpat = build::mk_pat(cx, span, move subpat);
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subpats.push(subpat);
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}
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return dvec::unwrap(move subpats);
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}
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fn create_enum_variant_pattern(cx: ext_ctxt,
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span: span,
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variant: &variant,
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prefix: ~str)
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-> @pat {
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let variant_ident = variant.node.name;
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match variant.node.kind {
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tuple_variant_kind(ref variant_args) => {
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if variant_args.len() == 0 {
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return build::mk_pat_ident_with_binding_mode(
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cx, span, variant_ident, ast::bind_infer);
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}
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let matching_path = build::mk_raw_path(span, ~[ variant_ident ]);
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let subpats = create_subpatterns(cx,
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span,
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prefix,
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variant_args.len());
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return build::mk_pat_enum(cx, span, matching_path, move subpats);
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}
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struct_variant_kind(struct_def) => {
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let matching_path = build::mk_raw_path(span, ~[ variant_ident ]);
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let subpats = create_subpatterns(cx,
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span,
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prefix,
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struct_def.fields.len());
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let field_pats = do struct_def.fields.mapi |i, struct_field| {
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let ident = match struct_field.node.kind {
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named_field(ident, _, _) => ident,
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unnamed_field => {
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cx.span_bug(span, ~"unexpected unnamed field");
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}
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};
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ast::field_pat { ident: ident, pat: subpats[i] }
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};
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build::mk_pat_struct(cx, span, matching_path, field_pats)
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}
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enum_variant_kind(*) => {
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cx.span_unimpl(span, ~"enum variants for `deriving`");
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}
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}
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}
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fn call_substructure_eq_method(cx: ext_ctxt,
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span: span,
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self_field: @expr,
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other_field_ref: @expr,
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method_ident: ident,
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junction: Junction,
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chain_expr: &mut Option<@expr>) {
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// Call the substructure method.
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let self_method = build::mk_access_(cx, span, self_field, method_ident);
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let self_call = build::mk_call_(cx,
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span,
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self_method,
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~[ other_field_ref ]);
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// Connect to the outer expression if necessary.
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*chain_expr = match *chain_expr {
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None => Some(self_call),
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Some(copy old_outer_expr) => {
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let binop = junction.to_binop();
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let chain_expr = build::mk_binary(cx,
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span,
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binop,
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old_outer_expr,
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self_call);
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Some(chain_expr)
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}
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};
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}
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fn finish_eq_chain_expr(cx: ext_ctxt,
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span: span,
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chain_expr: Option<@expr>,
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junction: Junction)
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-> @expr {
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match chain_expr {
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None => {
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match junction {
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Conjunction => build::mk_bool(cx, span, true),
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Disjunction => build::mk_bool(cx, span, false),
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}
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}
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Some(ref outer_expr) => *outer_expr,
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}
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}
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fn call_substructure_iter_bytes_method(cx: ext_ctxt,
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span: span,
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self_field: @expr)
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-> @stmt {
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// Gather up the parameters we want to chain along.
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let lsb0_ident = cx.ident_of(~"__lsb0");
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let f_ident = cx.ident_of(~"__f");
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let lsb0_expr = build::mk_path(cx, span, ~[ lsb0_ident ]);
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let f_expr = build::mk_path(cx, span, ~[ f_ident ]);
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// Call the substructure method.
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let iter_bytes_ident = cx.ident_of(~"iter_bytes");
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let self_method = build::mk_access_(cx,
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span,
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self_field,
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iter_bytes_ident);
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let self_call = build::mk_call_(cx,
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span,
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self_method,
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~[ lsb0_expr, f_expr ]);
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// Create a statement out of this expression.
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build::mk_stmt(cx, span, self_call)
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}
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fn variant_arg_count(cx: ext_ctxt, span: span, variant: &variant) -> uint {
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match variant.node.kind {
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tuple_variant_kind(args) => args.len(),
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struct_variant_kind(struct_def) => struct_def.fields.len(),
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enum_variant_kind(*) => {
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cx.span_bug(span, ~"variant_arg_count: enum variants deprecated")
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}
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}
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}
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fn expand_deriving_eq_struct_def(cx: ext_ctxt,
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span: span,
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struct_def: &struct_def,
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type_ident: ident,
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+ty_params: ~[ty_param])
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-> @item {
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// Create the methods.
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let eq_ident = cx.ident_of(~"eq");
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let ne_ident = cx.ident_of(~"ne");
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let eq_method = expand_deriving_eq_struct_method(cx,
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span,
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struct_def,
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eq_ident,
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type_ident,
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ty_params,
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Conjunction);
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let ne_method = expand_deriving_eq_struct_method(cx,
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span,
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struct_def,
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ne_ident,
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type_ident,
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ty_params,
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Disjunction);
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// Create the implementation.
|
|
return create_derived_eq_impl(cx,
|
|
span,
|
|
type_ident,
|
|
move ty_params,
|
|
eq_method,
|
|
ne_method);
|
|
}
|
|
|
|
fn expand_deriving_eq_enum_def(cx: ext_ctxt,
|
|
span: span,
|
|
enum_definition: &enum_def,
|
|
type_ident: ident,
|
|
+ty_params: ~[ty_param])
|
|
-> @item {
|
|
// Create the methods.
|
|
let eq_ident = cx.ident_of(~"eq");
|
|
let ne_ident = cx.ident_of(~"ne");
|
|
let eq_method = expand_deriving_eq_enum_method(cx,
|
|
span,
|
|
enum_definition,
|
|
eq_ident,
|
|
type_ident,
|
|
ty_params,
|
|
Conjunction);
|
|
let ne_method = expand_deriving_eq_enum_method(cx,
|
|
span,
|
|
enum_definition,
|
|
ne_ident,
|
|
type_ident,
|
|
ty_params,
|
|
Disjunction);
|
|
|
|
// Create the implementation.
|
|
return create_derived_eq_impl(cx,
|
|
span,
|
|
type_ident,
|
|
move ty_params,
|
|
eq_method,
|
|
ne_method);
|
|
}
|
|
|
|
fn expand_deriving_iter_bytes_struct_def(cx: ext_ctxt,
|
|
span: span,
|
|
struct_def: &struct_def,
|
|
type_ident: ident,
|
|
+ty_params: ~[ty_param])
|
|
-> @item {
|
|
// Create the method.
|
|
let method = expand_deriving_iter_bytes_struct_method(cx,
|
|
span,
|
|
struct_def);
|
|
|
|
// Create the implementation.
|
|
return create_derived_iter_bytes_impl(cx,
|
|
span,
|
|
type_ident,
|
|
move ty_params,
|
|
method);
|
|
}
|
|
|
|
fn expand_deriving_iter_bytes_enum_def(cx: ext_ctxt,
|
|
span: span,
|
|
enum_definition: &enum_def,
|
|
type_ident: ident,
|
|
+ty_params: ~[ty_param])
|
|
-> @item {
|
|
// Create the method.
|
|
let method = expand_deriving_iter_bytes_enum_method(cx,
|
|
span,
|
|
enum_definition);
|
|
|
|
// Create the implementation.
|
|
return create_derived_iter_bytes_impl(cx,
|
|
span,
|
|
type_ident,
|
|
move ty_params,
|
|
method);
|
|
}
|
|
|
|
fn expand_deriving_eq_struct_method(cx: ext_ctxt,
|
|
span: span,
|
|
struct_def: &struct_def,
|
|
method_ident: ident,
|
|
type_ident: ident,
|
|
ty_params: &[ty_param],
|
|
junction: Junction)
|
|
-> @method {
|
|
let self_ident = cx.ident_of(~"self");
|
|
let other_ident = cx.ident_of(~"__other");
|
|
|
|
// Create the body of the method.
|
|
let mut outer_expr = None;
|
|
for struct_def.fields.each |struct_field| {
|
|
match struct_field.node.kind {
|
|
named_field(ident, _, _) => {
|
|
// Create the accessor for the other field.
|
|
let other_field = build::mk_access(cx,
|
|
span,
|
|
~[ other_ident ],
|
|
ident);
|
|
let other_field_ref = build::mk_addr_of(cx,
|
|
span,
|
|
other_field);
|
|
|
|
// Create the accessor for this field.
|
|
let self_field = build::mk_access(cx,
|
|
span,
|
|
~[ self_ident ],
|
|
ident);
|
|
|
|
// Call the substructure method.
|
|
call_substructure_eq_method(cx,
|
|
span,
|
|
self_field,
|
|
other_field_ref,
|
|
method_ident,
|
|
junction,
|
|
&mut outer_expr);
|
|
}
|
|
unnamed_field => {
|
|
cx.span_unimpl(span, ~"unnamed fields with `deriving_eq`");
|
|
}
|
|
}
|
|
}
|
|
|
|
// Create the method itself.
|
|
let body = finish_eq_chain_expr(cx, span, outer_expr, junction);
|
|
return create_eq_method(cx,
|
|
span,
|
|
method_ident,
|
|
type_ident,
|
|
ty_params,
|
|
body);
|
|
}
|
|
|
|
fn expand_deriving_iter_bytes_struct_method(cx: ext_ctxt,
|
|
span: span,
|
|
struct_def: &struct_def)
|
|
-> @method {
|
|
let self_ident = cx.ident_of(~"self");
|
|
|
|
// Create the body of the method.
|
|
let statements = dvec::DVec();
|
|
for struct_def.fields.each |struct_field| {
|
|
match struct_field.node.kind {
|
|
named_field(ident, _, _) => {
|
|
// Create the accessor for this field.
|
|
let self_field = build::mk_access(cx,
|
|
span,
|
|
~[ self_ident ],
|
|
ident);
|
|
|
|
// Call the substructure method.
|
|
let stmt = call_substructure_iter_bytes_method(cx,
|
|
span,
|
|
self_field);
|
|
statements.push(stmt);
|
|
}
|
|
unnamed_field => {
|
|
cx.span_unimpl(span,
|
|
~"unnamed fields with `deriving_iter_bytes`");
|
|
}
|
|
}
|
|
}
|
|
|
|
// Create the method itself.
|
|
let statements = dvec::unwrap(move statements);
|
|
return create_iter_bytes_method(cx, span, move statements);
|
|
}
|
|
|
|
fn expand_deriving_eq_enum_method(cx: ext_ctxt,
|
|
span: span,
|
|
enum_definition: &enum_def,
|
|
method_ident: ident,
|
|
type_ident: ident,
|
|
ty_params: &[ty_param],
|
|
junction: Junction)
|
|
-> @method {
|
|
let self_ident = cx.ident_of(~"self");
|
|
let other_ident = cx.ident_of(~"__other");
|
|
|
|
let is_eq;
|
|
match junction {
|
|
Conjunction => is_eq = true,
|
|
Disjunction => is_eq = false,
|
|
}
|
|
|
|
// Create the arms of the self match in the method body.
|
|
let self_arms = dvec::DVec();
|
|
for enum_definition.variants.each |self_variant| {
|
|
let other_arms = dvec::DVec();
|
|
|
|
// Create the matching pattern.
|
|
let matching_pat = create_enum_variant_pattern(cx,
|
|
span,
|
|
self_variant,
|
|
~"__other");
|
|
|
|
// Create the matching pattern body.
|
|
let mut matching_body_expr = None;
|
|
for uint::range(0, variant_arg_count(cx, span, self_variant)) |i| {
|
|
// Create the expression for the other field.
|
|
let other_field_ident = cx.ident_of(~"__other" + i.to_str());
|
|
let other_field = build::mk_path(cx,
|
|
span,
|
|
~[ other_field_ident ]);
|
|
|
|
// Create the expression for this field.
|
|
let self_field_ident = cx.ident_of(~"__self" + i.to_str());
|
|
let self_field = build::mk_path(cx, span, ~[ self_field_ident ]);
|
|
|
|
// Call the substructure method.
|
|
call_substructure_eq_method(cx,
|
|
span,
|
|
self_field,
|
|
other_field,
|
|
method_ident,
|
|
junction,
|
|
&mut matching_body_expr);
|
|
}
|
|
|
|
let matching_body_expr = finish_eq_chain_expr(cx,
|
|
span,
|
|
matching_body_expr,
|
|
junction);
|
|
let matching_body_block = build::mk_simple_block(cx,
|
|
span,
|
|
matching_body_expr);
|
|
|
|
// Create the matching arm.
|
|
let matching_arm = ast::arm {
|
|
pats: ~[ matching_pat ],
|
|
guard: None,
|
|
body: move matching_body_block
|
|
};
|
|
other_arms.push(move matching_arm);
|
|
|
|
// Maybe generate a non-matching case. If there is only one
|
|
// variant then there will always be a match.
|
|
if enum_definition.variants.len() > 1 {
|
|
// Create the nonmatching pattern.
|
|
let nonmatching_pat = @ast::pat {
|
|
id: cx.next_id(),
|
|
node: pat_wild,
|
|
span: span
|
|
};
|
|
|
|
// Create the nonmatching pattern body.
|
|
let nonmatching_expr = build::mk_bool(cx, span, !is_eq);
|
|
let nonmatching_body_block =
|
|
build::mk_simple_block(cx,
|
|
span,
|
|
nonmatching_expr);
|
|
|
|
// Create the nonmatching arm.
|
|
let nonmatching_arm = ast::arm {
|
|
pats: ~[ nonmatching_pat ],
|
|
guard: None,
|
|
body: nonmatching_body_block,
|
|
};
|
|
other_arms.push(nonmatching_arm);
|
|
}
|
|
|
|
// Create the self pattern.
|
|
let self_pat = create_enum_variant_pattern(cx,
|
|
span,
|
|
self_variant,
|
|
~"__self");
|
|
|
|
// Create the self pattern body.
|
|
let other_expr = build::mk_path(cx, span, ~[ other_ident ]);
|
|
let other_expr = build::mk_unary(cx, span, deref, other_expr);
|
|
let other_arms = dvec::unwrap(move other_arms);
|
|
let other_match_expr = expr_match(other_expr, move other_arms);
|
|
let other_match_expr = build::mk_expr(cx,
|
|
span,
|
|
move other_match_expr);
|
|
let other_match_body_block = build::mk_simple_block(cx,
|
|
span,
|
|
other_match_expr);
|
|
|
|
// Create the self arm.
|
|
let self_arm = ast::arm {
|
|
pats: ~[ self_pat ],
|
|
guard: None,
|
|
body: other_match_body_block,
|
|
};
|
|
self_arms.push(move self_arm);
|
|
}
|
|
|
|
// Create the method body.
|
|
let self_expr = build::mk_path(cx, span, ~[ self_ident ]);
|
|
let self_expr = build::mk_unary(cx, span, deref, self_expr);
|
|
let self_arms = dvec::unwrap(move self_arms);
|
|
let self_match_expr = expr_match(self_expr, move self_arms);
|
|
let self_match_expr = build::mk_expr(cx, span, move self_match_expr);
|
|
|
|
// Create the method.
|
|
return create_eq_method(cx,
|
|
span,
|
|
method_ident,
|
|
type_ident,
|
|
ty_params,
|
|
self_match_expr);
|
|
}
|
|
|
|
fn expand_deriving_iter_bytes_enum_method(cx: ext_ctxt,
|
|
span: span,
|
|
enum_definition: &enum_def)
|
|
-> @method {
|
|
// Create the arms of the match in the method body.
|
|
let arms = do enum_definition.variants.mapi |i, variant| {
|
|
// Create the matching pattern.
|
|
let pat = create_enum_variant_pattern(cx, span, variant, ~"__self");
|
|
|
|
// Determine the discriminant. We will feed this value to the byte
|
|
// iteration function.
|
|
let discriminant;
|
|
match variant.node.disr_expr {
|
|
Some(copy disr_expr) => discriminant = disr_expr,
|
|
None => discriminant = build::mk_uint(cx, span, i),
|
|
}
|
|
|
|
// Feed the discriminant to the byte iteration function.
|
|
let stmts = dvec::DVec();
|
|
let discrim_stmt = call_substructure_iter_bytes_method(cx,
|
|
span,
|
|
discriminant);
|
|
stmts.push(discrim_stmt);
|
|
|
|
// Feed each argument in this variant to the byte iteration function
|
|
// as well.
|
|
for uint::range(0, variant_arg_count(cx, span, variant)) |j| {
|
|
// Create the expression for this field.
|
|
let field_ident = cx.ident_of(~"__self" + j.to_str());
|
|
let field = build::mk_path(cx, span, ~[ field_ident ]);
|
|
|
|
// Call the substructure method.
|
|
let stmt = call_substructure_iter_bytes_method(cx, span, field);
|
|
stmts.push(stmt);
|
|
}
|
|
|
|
// Create the pattern body.
|
|
let stmts = dvec::unwrap(move stmts);
|
|
let match_body_block = build::mk_block_(cx, span, move stmts);
|
|
|
|
// Create the arm.
|
|
ast::arm {
|
|
pats: ~[ pat ],
|
|
guard: None,
|
|
body: match_body_block,
|
|
}
|
|
};
|
|
|
|
// Create the method body.
|
|
let self_ident = cx.ident_of(~"self");
|
|
let self_expr = build::mk_path(cx, span, ~[ self_ident ]);
|
|
let self_expr = build::mk_unary(cx, span, deref, self_expr);
|
|
let self_match_expr = expr_match(self_expr, arms);
|
|
let self_match_expr = build::mk_expr(cx, span, self_match_expr);
|
|
let self_match_stmt = build::mk_stmt(cx, span, self_match_expr);
|
|
|
|
// Create the method.
|
|
create_iter_bytes_method(cx, span, ~[ self_match_stmt ])
|
|
}
|
|
|