203 lines
4.3 KiB
Rust
203 lines
4.3 KiB
Rust
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// Copyright 2015, 2016 Ethcore (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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use aster;
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use syntax::ast::{
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MetaItem,
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Item,
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ImplItemKind,
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ImplItem,
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MethodSig,
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Arg,
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PatKind,
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FunctionRetTy,
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Ty,
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TraitRef,
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Ident,
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Generics,
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};
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use syntax::ast;
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use syntax::codemap::Span;
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use syntax::ext::base::{Annotatable, ExtCtxt};
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use syntax::ext::build::AstBuilder;
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use syntax::ptr::P;
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pub struct Error;
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pub fn expand_serialization_implementation(
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cx: &mut ExtCtxt,
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span: Span,
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meta_item: &MetaItem,
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annotatable: &Annotatable,
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push: &mut FnMut(Annotatable)
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) {
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let item = match *annotatable {
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Annotatable::Item(ref item) => item,
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_ => {
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cx.span_err(meta_item.span, "`#[derive(Binary)]` may only be applied to structs and enums");
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return;
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}
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};
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let builder = aster::AstBuilder::new().span(span);
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let impl_item = match serialize_item(cx, &builder, &item) {
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Ok(item) => item,
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Err(Error) => {
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// An error occured, but it should have been reported already.
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return;
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}
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};
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push(Annotatable::Item(impl_item))
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}
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fn serialize_item(
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cx: &ExtCtxt,
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builder: &aster::AstBuilder,
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item: &Item,
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) -> Result<P<ast::Item>, Error> {
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let generics = match item.node {
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ast::ItemKind::Struct(_, ref generics) => generics,
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ast::ItemKind::Enum(_, ref generics) => generics,
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_ => {
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cx.span_err(
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item.span,
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"`#[derive(Serialize)]` may only be applied to structs and enums");
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return Err(Error);
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}
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};
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let impl_generics = build_impl_generics(cx, builder, item, generics);
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let ty = builder.ty().path()
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.segment(item.ident).with_generics(impl_generics.clone()).build()
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.build();
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let where_clause = &impl_generics.where_clause;
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let binary_expressions = try!(binary_expr(cx,
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&builder,
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&item,
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&impl_generics,
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ty.clone()));
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Ok(quote_item!(cx,
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impl $impl_generics ::ipc::BinaryConvertable for $ty $where_clause {
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fn size(&self) -> usize {
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$size_expr
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}
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fn to_bytes(buffer: &mut [u8]) {
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$write_expr
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}
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fn from_bytes(buffer: &[u8]) -> Self {
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$create_expr
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}
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}
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).unwrap())
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}
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fn binary_expr(
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cx: &ExtCtxt,
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builder: &aster::AstBuilder,
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item: &Item,
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impl_generics: &ast::Generics,
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ty: P<ast::Ty>,
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) -> Result<BinaryExpressions, Error> {
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match item.node {
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ast::ItemKind::Struct(ref variant_data, _) => {
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binary_expr_struct(
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cx,
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builder,
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impl_generics,
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ty,
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item.span,
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variant_data,
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)
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}
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ast::ItemKind::Enum(ref enum_def, _) => {
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binary_expr_enum(
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cx,
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builder,
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item.ident,
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impl_generics,
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ty,
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enum_def,
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)
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}
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_ => {
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cx.span_bug(item.span,
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"expected ItemStruct or ItemEnum in #[derive(Serialize)]");
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}
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}
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}
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struct BinaryExpressions {
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size: P<ast::Expr>,
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write: P<ast::Stmt>,
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read: P<ast::Expr>,
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}
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fn serialize_tuple_struct(
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cx: &ExtCtxt,
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builder: &aster::AstBuilder,
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impl_generics: &ast::Generics,
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ty: P<ast::Ty>,
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fields: usize,
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) -> Result<P<ast::Expr>, Error> {
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let type_name = field.ty;
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let id = field.id;
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Ok(BinaryExpressions {
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size: quote_expr!(cx, self. $id .size() ),
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write: quote_stmt!(cx, self. $id .write(buffer); ),
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read: quote_expr!(cx, Self { $id: $type_name ::from_bytes(buffer) }),
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});
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}
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fn binary_expr_struct(
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cx: &ExtCtxt,
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builder: &aster::AstBuilder,
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impl_generics: &ast::Generics,
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ty: P<ast::Ty>,
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span: Span,
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variant_data: &ast::VariantData,
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) -> Result<BinaryExpressions, Error> {
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match *variant_data {
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ast::VariantData::Tuple(ref fields, _) => {
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binary_expr_struct_tuple(
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cx,
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&builder,
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impl_generics,
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ty,
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fields,
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)
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}
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ast::VariantData::Struct(ref fields, _) => {
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binary_expr_struct_inner(
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cx,
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&builder,
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impl_generics,
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ty,
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fields,
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)
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}
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}
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}
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