6ec275d381
This reverts commit 4e5f0bc961.
Unfortunately, in std contexts, the `alloc` crate is not imported. That
means we cannot rely on it being accessible and it in fact breaks builds
of crates which are not `no_std`.
Fixes #155.
89 lines
2.6 KiB
Rust
89 lines
2.6 KiB
Rust
// Copyright (c) 2024 Jonas Schäfer <jonas@zombofant.net>
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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//! This module concerns the processing of text content.
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//!
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//! In particular, it provides the `#[xml(text)]` implementation.
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use proc_macro2::Span;
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use quote::quote;
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use syn::*;
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use crate::error_message::ParentRef;
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use crate::scope::{AsItemsScope, FromEventsScope};
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use crate::types::{
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as_xml_text_fn, from_xml_text_fn, string_ty, text_codec_decode_fn, text_codec_encode_fn,
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};
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use super::{Field, FieldBuilderPart, FieldIteratorPart, FieldTempInit};
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/// The field maps to the character data of the element.
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pub(super) struct TextField {
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/// Optional codec to use
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pub(super) codec: Option<Expr>,
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}
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impl Field for TextField {
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fn make_builder_part(
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&self,
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scope: &FromEventsScope,
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_container_name: &ParentRef,
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member: &Member,
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ty: &Type,
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) -> Result<FieldBuilderPart> {
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let FromEventsScope { ref text, .. } = scope;
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let field_access = scope.access_field(member);
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let finalize = match self.codec {
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Some(ref codec) => {
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let decode = text_codec_decode_fn(ty.clone());
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quote! {
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#decode(&#codec, #field_access)?
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}
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}
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None => {
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let from_xml_text = from_xml_text_fn(ty.clone());
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quote! { #from_xml_text(#field_access)? }
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}
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};
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Ok(FieldBuilderPart::Text {
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value: FieldTempInit {
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init: quote! { ::std::string::String::new() },
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ty: string_ty(Span::call_site()),
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},
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collect: quote! {
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#field_access.push_str(#text.as_str());
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},
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finalize,
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})
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}
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fn make_iterator_part(
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&self,
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_scope: &AsItemsScope,
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_container_name: &ParentRef,
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bound_name: &Ident,
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_member: &Member,
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ty: &Type,
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) -> Result<FieldIteratorPart> {
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let generator = match self.codec {
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Some(ref codec) => {
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let encode = text_codec_encode_fn(ty.clone());
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quote! { #encode(&#codec, #bound_name)? }
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}
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None => {
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let as_xml_text = as_xml_text_fn(ty.clone());
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quote! { ::core::option::Option::Some(#as_xml_text(#bound_name)?) }
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}
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};
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Ok(FieldIteratorPart::Text { generator })
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}
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fn captures_text(&self) -> bool {
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true
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}
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}
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