687 lines
26 KiB
Rust
687 lines
26 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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//! Handling of the insides of compound structures (structs and enum variants)
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use proc_macro2::{Span, TokenStream};
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use quote::quote;
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use syn::{spanned::Spanned, *};
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use crate::error_message::ParentRef;
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use crate::field::{FieldBuilderPart, FieldDef, FieldIteratorPart, FieldTempInit, NestedMatcher};
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use crate::meta::NamespaceRef;
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use crate::scope::{mangle_member, AsItemsScope, FromEventsScope};
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use crate::state::{AsItemsSubmachine, FromEventsSubmachine, State};
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use crate::types::{
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default_fn, discard_builder_ty, feed_fn, namespace_ty, ncnamestr_cow_ty, phantom_lifetime_ty,
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ref_ty, unknown_attribute_policy_path, unknown_child_policy_path,
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};
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fn resolve_policy(policy: Option<Ident>, mut enum_ref: Path) -> Expr {
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match policy {
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Some(ident) => {
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enum_ref.segments.push(ident.into());
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Expr::Path(ExprPath {
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attrs: Vec::new(),
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qself: None,
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path: enum_ref,
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})
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}
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None => {
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let default_fn = default_fn(Type::Path(TypePath {
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qself: None,
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path: enum_ref,
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}));
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Expr::Call(ExprCall {
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attrs: Vec::new(),
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func: Box::new(default_fn),
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paren_token: token::Paren::default(),
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args: punctuated::Punctuated::new(),
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})
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}
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}
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}
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/// A struct or enum variant's contents.
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pub(crate) struct Compound {
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/// The fields of this compound.
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fields: Vec<FieldDef>,
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/// Policy defining how to handle unknown attributes.
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unknown_attribute_policy: Expr,
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/// Policy defining how to handle unknown children.
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unknown_child_policy: Expr,
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}
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impl Compound {
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/// Construct a compound from processed field definitions.
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pub(crate) fn from_field_defs<I: IntoIterator<Item = Result<FieldDef>>>(
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compound_fields: I,
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unknown_attribute_policy: Option<Ident>,
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unknown_child_policy: Option<Ident>,
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) -> Result<Self> {
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let unknown_attribute_policy = resolve_policy(
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unknown_attribute_policy,
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unknown_attribute_policy_path(Span::call_site()),
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);
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let unknown_child_policy = resolve_policy(
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unknown_child_policy,
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unknown_child_policy_path(Span::call_site()),
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);
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let compound_fields = compound_fields.into_iter();
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let size_hint = compound_fields.size_hint();
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let mut fields = Vec::with_capacity(size_hint.1.unwrap_or(size_hint.0));
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let mut text_field = None;
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for field in compound_fields {
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let field = field?;
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if field.is_text_field() {
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if let Some(other_field) = text_field.as_ref() {
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let mut err = Error::new_spanned(
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field.member(),
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"only one `#[xml(text)]` field allowed per compound",
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);
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err.combine(Error::new(
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*other_field,
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"the other `#[xml(text)]` field is here",
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));
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return Err(err);
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}
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text_field = Some(field.member().span())
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}
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fields.push(field);
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}
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Ok(Self {
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fields,
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unknown_attribute_policy,
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unknown_child_policy,
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})
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}
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/// Construct a compound from fields.
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pub(crate) fn from_fields(
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compound_fields: &Fields,
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container_namespace: &NamespaceRef,
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unknown_attribute_policy: Option<Ident>,
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unknown_child_policy: Option<Ident>,
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) -> Result<Self> {
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Self::from_field_defs(
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compound_fields.iter().enumerate().map(|(i, field)| {
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let index = match i.try_into() {
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Ok(v) => v,
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// we are converting to u32, are you crazy?!
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// (u32, because syn::Member::Index needs that.)
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Err(_) => {
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return Err(Error::new_spanned(
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field,
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"okay, mate, that are way too many fields. get your life together.",
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))
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}
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};
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FieldDef::from_field(field, index, container_namespace)
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}),
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unknown_attribute_policy,
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unknown_child_policy,
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)
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}
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/// Make and return a set of states which is used to construct the target
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/// type from XML events.
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///
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/// The states are returned as partial state machine. See the return
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/// type's documentation for details.
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pub(crate) fn make_from_events_statemachine(
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&self,
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state_ty_ident: &Ident,
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output_name: &ParentRef,
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state_prefix: &str,
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) -> Result<FromEventsSubmachine> {
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let scope = FromEventsScope::new(state_ty_ident.clone());
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let FromEventsScope {
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ref attrs,
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ref builder_data_ident,
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ref text,
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ref substate_data,
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ref substate_result,
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..
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} = scope;
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let default_state_ident = quote::format_ident!("{}Default", state_prefix);
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let discard_state_ident = quote::format_ident!("{}Discard", state_prefix);
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let builder_data_ty: Type = TypePath {
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qself: None,
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path: quote::format_ident!("{}Data{}", state_ty_ident, state_prefix).into(),
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}
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.into();
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let mut states = Vec::new();
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let mut builder_data_def = TokenStream::default();
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let mut builder_data_init = TokenStream::default();
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let mut output_cons = TokenStream::default();
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let mut child_matchers = TokenStream::default();
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let mut fallback_child_matcher = None;
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let mut text_handler = None;
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let mut extra_defs = TokenStream::default();
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let is_tuple = !output_name.is_path();
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for (i, field) in self.fields.iter().enumerate() {
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let member = field.member();
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let builder_field_name = mangle_member(member);
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let part = field.make_builder_part(&scope, output_name)?;
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let state_name = quote::format_ident!("{}Field{}", state_prefix, i);
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match part {
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FieldBuilderPart::Init {
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value: FieldTempInit { ty, init },
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} => {
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builder_data_def.extend(quote! {
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#builder_field_name: #ty,
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});
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builder_data_init.extend(quote! {
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#builder_field_name: #init,
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});
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if is_tuple {
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output_cons.extend(quote! {
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#builder_data_ident.#builder_field_name,
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});
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} else {
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output_cons.extend(quote! {
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#member: #builder_data_ident.#builder_field_name,
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});
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}
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}
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FieldBuilderPart::Text {
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value: FieldTempInit { ty, init },
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collect,
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finalize,
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} => {
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if text_handler.is_some() {
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// the existence of only one text handler is enforced
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// by Compound's constructor(s).
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panic!("more than one field attempts to collect text data");
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}
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builder_data_def.extend(quote! {
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#builder_field_name: #ty,
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});
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builder_data_init.extend(quote! {
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#builder_field_name: #init,
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});
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text_handler = Some(quote! {
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#collect
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::core::result::Result::Ok(::core::ops::ControlFlow::Break(
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Self::#default_state_ident { #builder_data_ident }
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))
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});
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if is_tuple {
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output_cons.extend(quote! {
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#finalize,
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});
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} else {
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output_cons.extend(quote! {
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#member: #finalize,
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});
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}
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}
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FieldBuilderPart::Nested {
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extra_defs: field_extra_defs,
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value: FieldTempInit { ty, init },
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matcher,
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builder,
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collect,
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finalize,
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} => {
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let feed = feed_fn(builder.clone());
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states.push(State::new_with_builder(
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state_name.clone(),
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&builder_data_ident,
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&builder_data_ty,
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).with_field(
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substate_data,
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&builder,
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).with_mut(substate_data).with_impl(quote! {
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match #feed(&mut #substate_data, ev)? {
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::core::option::Option::Some(#substate_result) => {
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#collect
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::core::result::Result::Ok(::core::ops::ControlFlow::Break(Self::#default_state_ident {
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#builder_data_ident,
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}))
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}
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::core::option::Option::None => {
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::core::result::Result::Ok(::core::ops::ControlFlow::Break(Self::#state_name {
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#builder_data_ident,
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#substate_data,
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}))
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}
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}
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}));
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builder_data_def.extend(quote! {
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#builder_field_name: #ty,
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});
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builder_data_init.extend(quote! {
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#builder_field_name: #init,
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});
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match matcher {
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NestedMatcher::Selective(matcher) => {
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child_matchers.extend(quote! {
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let (name, attrs) = match #matcher {
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::core::result::Result::Err(::xso::error::FromEventsError::Mismatch { name, attrs }) => (name, attrs),
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::core::result::Result::Err(::xso::error::FromEventsError::Invalid(e)) => return ::core::result::Result::Err(e),
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::core::result::Result::Ok(#substate_data) => {
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return ::core::result::Result::Ok(::core::ops::ControlFlow::Break(Self::#state_name {
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#builder_data_ident,
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#substate_data,
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}))
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}
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};
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});
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}
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NestedMatcher::Fallback(matcher) => {
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if let Some((span, _)) = fallback_child_matcher.as_ref() {
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let mut err = Error::new(
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field.span(),
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"more than one field is attempting to consume all unmatched child elements"
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);
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err.combine(Error::new(
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*span,
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"the previous field collecting all unmatched child elements is here"
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));
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return Err(err);
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}
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let matcher = quote! {
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::core::result::Result::Ok(::core::ops::ControlFlow::Break(Self::#state_name {
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#builder_data_ident,
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#substate_data: { #matcher },
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}))
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};
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fallback_child_matcher = Some((field.span(), matcher));
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}
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}
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if is_tuple {
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output_cons.extend(quote! {
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#finalize,
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});
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} else {
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output_cons.extend(quote! {
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#member: #finalize,
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});
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}
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extra_defs.extend(field_extra_defs);
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}
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}
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}
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let text_handler = match text_handler {
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Some(v) => v,
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None => quote! {
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// note: u8::is_ascii_whitespace includes U+000C, which is not
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// part of XML's white space definition.'
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if !::xso::is_xml_whitespace(#text.as_bytes()) {
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::core::result::Result::Err(::xso::error::Error::Other("Unexpected text content".into()))
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} else {
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::core::result::Result::Ok(::core::ops::ControlFlow::Break(
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Self::#default_state_ident { #builder_data_ident }
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))
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}
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},
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};
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let unknown_attr_err = format!("Unknown attribute in {}.", output_name);
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let unknown_child_err = format!("Unknown child in {}.", output_name);
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let unknown_child_policy = &self.unknown_child_policy;
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let output_cons = match output_name {
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ParentRef::Named(ref path) => {
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quote! {
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#path { #output_cons }
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}
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}
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ParentRef::Unnamed { .. } => {
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quote! {
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( #output_cons )
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}
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}
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};
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let discard_builder_ty = discard_builder_ty(Span::call_site());
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let discard_feed = feed_fn(discard_builder_ty.clone());
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let child_fallback = match fallback_child_matcher {
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Some((_, matcher)) => matcher,
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None => quote! {
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let _ = (name, attrs);
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let _: () = #unknown_child_policy.apply_policy(#unknown_child_err)?;
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::core::result::Result::Ok(::core::ops::ControlFlow::Break(Self::#discard_state_ident {
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#builder_data_ident,
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#substate_data: #discard_builder_ty::new(),
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}))
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},
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};
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states.push(State::new_with_builder(
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discard_state_ident.clone(),
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&builder_data_ident,
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&builder_data_ty,
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).with_field(
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substate_data,
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&discard_builder_ty,
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).with_mut(substate_data).with_impl(quote! {
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match #discard_feed(&mut #substate_data, ev)? {
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::core::option::Option::Some(#substate_result) => {
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::core::result::Result::Ok(::core::ops::ControlFlow::Break(Self::#default_state_ident {
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#builder_data_ident,
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}))
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}
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::core::option::Option::None => {
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::core::result::Result::Ok(::core::ops::ControlFlow::Break(Self::#discard_state_ident {
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#builder_data_ident,
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#substate_data,
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}))
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}
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}
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}));
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states.push(State::new_with_builder(
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default_state_ident.clone(),
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builder_data_ident,
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&builder_data_ty,
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).with_impl(quote! {
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match ev {
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// EndElement in Default state -> done parsing.
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::xso::exports::rxml::Event::EndElement(_) => {
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::core::result::Result::Ok(::core::ops::ControlFlow::Continue(
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#output_cons
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))
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}
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::xso::exports::rxml::Event::StartElement(_, name, attrs) => {
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#child_matchers
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#child_fallback
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}
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::xso::exports::rxml::Event::Text(_, #text) => {
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#text_handler
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}
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// we ignore these: a correct parser only generates
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// them at document start, and there we want to indeed
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// not worry about them being in front of the first
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// element.
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::xso::exports::rxml::Event::XmlDeclaration(_, ::xso::exports::rxml::XmlVersion::V1_0) => ::core::result::Result::Ok(::core::ops::ControlFlow::Break(
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Self::#default_state_ident { #builder_data_ident }
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))
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}
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}));
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let unknown_attribute_policy = &self.unknown_attribute_policy;
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Ok(FromEventsSubmachine {
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defs: quote! {
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#extra_defs
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struct #builder_data_ty {
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#builder_data_def
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}
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},
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states,
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init: quote! {
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let #builder_data_ident = #builder_data_ty {
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#builder_data_init
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};
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if #attrs.len() > 0 {
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let _: () = #unknown_attribute_policy.apply_policy(#unknown_attr_err)?;
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}
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::core::result::Result::Ok(#state_ty_ident::#default_state_ident { #builder_data_ident })
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},
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})
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}
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/// Make and return a set of states which is used to destructure the
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/// target type into XML events.
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///
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/// The states are returned as partial state machine. See the return
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/// type's documentation for details.
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///
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/// **Important:** The returned submachine is not in functional state!
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/// It's `init` must be modified so that a variable called `name` of type
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/// `rxml::QName` is in scope.
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pub(crate) fn make_as_item_iter_statemachine(
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&self,
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input_name: &ParentRef,
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state_ty_ident: &Ident,
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state_prefix: &str,
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lifetime: &Lifetime,
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) -> Result<AsItemsSubmachine> {
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let scope = AsItemsScope::new(lifetime, state_ty_ident.clone());
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let element_head_start_state_ident =
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quote::format_ident!("{}ElementHeadStart", state_prefix);
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let element_head_end_state_ident = quote::format_ident!("{}ElementHeadEnd", state_prefix);
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let element_foot_state_ident = quote::format_ident!("{}ElementFoot", state_prefix);
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let name_ident = quote::format_ident!("name");
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let ns_ident = quote::format_ident!("ns");
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let dummy_ident = quote::format_ident!("dummy");
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let mut states = Vec::new();
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let is_tuple = !input_name.is_path();
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let mut destructure = TokenStream::default();
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let mut start_init = TokenStream::default();
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let mut extra_defs = TokenStream::default();
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states.push(
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State::new(element_head_start_state_ident.clone())
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.with_field(&dummy_ident, &phantom_lifetime_ty(lifetime.clone()))
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.with_field(&ns_ident, &namespace_ty(Span::call_site()))
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.with_field(
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&name_ident,
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&ncnamestr_cow_ty(Span::call_site(), lifetime.clone()),
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),
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);
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let mut element_head_end_idx = states.len();
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states.push(
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State::new(element_head_end_state_ident.clone()).with_impl(quote! {
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::core::option::Option::Some(::xso::Item::ElementHeadEnd)
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}),
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);
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for (i, field) in self.fields.iter().enumerate() {
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let member = field.member();
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let bound_name = mangle_member(member);
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let part = field.make_iterator_part(&scope, input_name, &bound_name)?;
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let state_name = quote::format_ident!("{}Field{}", state_prefix, i);
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let ty = scope.borrow(field.ty().clone());
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match part {
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FieldIteratorPart::Header { generator } => {
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// we have to make sure that we carry our data around in
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// all the previous states.
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for state in &mut states[..element_head_end_idx] {
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state.add_field(&bound_name, &ty);
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}
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states.insert(
|
|
element_head_end_idx,
|
|
State::new(state_name)
|
|
.with_field(&bound_name, &ty)
|
|
.with_impl(quote! {
|
|
#generator
|
|
}),
|
|
);
|
|
element_head_end_idx += 1;
|
|
|
|
if is_tuple {
|
|
destructure.extend(quote! {
|
|
ref #bound_name,
|
|
});
|
|
} else {
|
|
destructure.extend(quote! {
|
|
#member: ref #bound_name,
|
|
});
|
|
}
|
|
start_init.extend(quote! {
|
|
#bound_name,
|
|
});
|
|
}
|
|
|
|
FieldIteratorPart::Text { generator } => {
|
|
// we have to make sure that we carry our data around in
|
|
// all the previous states.
|
|
for state in states.iter_mut() {
|
|
state.add_field(&bound_name, &ty);
|
|
}
|
|
states.push(
|
|
State::new(state_name)
|
|
.with_field(&bound_name, &ty)
|
|
.with_impl(quote! {
|
|
#generator.map(|value| ::xso::Item::Text(
|
|
value,
|
|
))
|
|
}),
|
|
);
|
|
if is_tuple {
|
|
destructure.extend(quote! {
|
|
#bound_name,
|
|
});
|
|
} else {
|
|
destructure.extend(quote! {
|
|
#member: #bound_name,
|
|
});
|
|
}
|
|
start_init.extend(quote! {
|
|
#bound_name,
|
|
});
|
|
}
|
|
|
|
FieldIteratorPart::Content {
|
|
extra_defs: field_extra_defs,
|
|
value: FieldTempInit { ty, init },
|
|
generator,
|
|
} => {
|
|
// we have to make sure that we carry our data around in
|
|
// all the previous states.
|
|
for state in states.iter_mut() {
|
|
state.add_field(&bound_name, &ty);
|
|
}
|
|
|
|
states.push(
|
|
State::new(state_name.clone())
|
|
.with_field(&bound_name, &ty)
|
|
.with_mut(&bound_name)
|
|
.with_impl(quote! {
|
|
#generator?
|
|
}),
|
|
);
|
|
if is_tuple {
|
|
destructure.extend(quote! {
|
|
#bound_name,
|
|
});
|
|
} else {
|
|
destructure.extend(quote! {
|
|
#member: #bound_name,
|
|
});
|
|
}
|
|
start_init.extend(quote! {
|
|
#bound_name: #init,
|
|
});
|
|
|
|
extra_defs.extend(field_extra_defs);
|
|
}
|
|
}
|
|
}
|
|
|
|
states[0].set_impl(quote! {
|
|
{
|
|
::core::option::Option::Some(::xso::Item::ElementHeadStart(
|
|
#ns_ident,
|
|
#name_ident,
|
|
))
|
|
}
|
|
});
|
|
|
|
states.push(
|
|
State::new(element_foot_state_ident.clone()).with_impl(quote! {
|
|
::core::option::Option::Some(::xso::Item::ElementFoot)
|
|
}),
|
|
);
|
|
|
|
let destructure = match input_name {
|
|
ParentRef::Named(ref input_path) => quote! {
|
|
#input_path { #destructure }
|
|
},
|
|
ParentRef::Unnamed { .. } => quote! {
|
|
( #destructure )
|
|
},
|
|
};
|
|
|
|
Ok(AsItemsSubmachine {
|
|
defs: extra_defs,
|
|
states,
|
|
destructure,
|
|
init: quote! {
|
|
Self::#element_head_start_state_ident { #dummy_ident: ::core::marker::PhantomData, #name_ident: name.1, #ns_ident: name.0, #start_init }
|
|
},
|
|
})
|
|
}
|
|
|
|
/// Return a reference to this compound's only field's type.
|
|
///
|
|
/// If the compound does not have exactly one field, this function returns
|
|
/// None.
|
|
pub(crate) fn single_ty(&self) -> Option<&Type> {
|
|
if self.fields.len() > 1 {
|
|
return None;
|
|
}
|
|
self.fields.get(0).map(|x| x.ty())
|
|
}
|
|
|
|
/// Construct a tuple type with this compound's field's types in the same
|
|
/// order as they appear in the compound.
|
|
pub(crate) fn to_tuple_ty(&self) -> TypeTuple {
|
|
TypeTuple {
|
|
paren_token: token::Paren::default(),
|
|
elems: self.fields.iter().map(|x| x.ty().clone()).collect(),
|
|
}
|
|
}
|
|
|
|
/// Construct a tuple type with this compound's field's types in the same
|
|
/// order as they appear in the compound.
|
|
pub(crate) fn to_single_or_tuple_ty(&self) -> Type {
|
|
match self.single_ty() {
|
|
None => self.to_tuple_ty().into(),
|
|
Some(v) => v.clone(),
|
|
}
|
|
}
|
|
|
|
/// Construct a tuple type with references to this compound's field's
|
|
/// types in the same order as they appear in the compound, with the given
|
|
/// lifetime.
|
|
pub(crate) fn to_ref_tuple_ty(&self, lifetime: &Lifetime) -> TypeTuple {
|
|
TypeTuple {
|
|
paren_token: token::Paren::default(),
|
|
elems: self
|
|
.fields
|
|
.iter()
|
|
.map(|x| ref_ty(x.ty().clone(), lifetime.clone()))
|
|
.collect(),
|
|
}
|
|
}
|
|
|
|
/// Return the number of fields in this compound.
|
|
pub(crate) fn field_count(&self) -> usize {
|
|
self.fields.len()
|
|
}
|
|
}
|