802 lines
30 KiB
Rust
802 lines
30 KiB
Rust
// XIR element parser generator
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//
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// Copyright (C) 2014-2022 Ryan Specialty Group, LLC.
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//
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// This file is part of TAME.
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//
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// This program 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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//
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// This program 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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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//! Element parser generator for parsing of [XIRF](super::super::flat).
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use crate::parse::ParseState;
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/// A parser accepting a single element.
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pub trait EleParseState: ParseState {}
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/// Element parser configuration.
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///
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/// This configuration is set on a nonterminal reference using square
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/// brackets
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/// (e.g. `Foo[*]`).
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#[derive(Debug, PartialEq, Default)]
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pub struct EleParseCfg {
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/// Whether to allow zero-or-more repetition for this element.
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///
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/// This is the Kleene star modifier (`*`).
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pub repeat: bool,
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}
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#[macro_export]
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macro_rules! ele_parse {
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(
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// Attr has to be first to avoid ambiguity with `$rest`.
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$(type AttrValueError = $evty:ty;)?
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type Object = $objty:ty;
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$($rest:tt)*
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) => {
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ele_parse!(@!nonterm_decl <$objty, $($evty)?> $($rest)*);
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};
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(@!nonterm_decl <$objty:ty, $($evty:ty)?> $nt:ident := $($rest:tt)*) => {
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ele_parse!(@!nonterm_def <$objty, $($evty)?> $nt $($rest)*);
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};
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(@!nonterm_def <$objty:ty, $($evty:ty)?>
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$nt:ident $qname:ident $(($($ntp:tt)*))?
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{ $($matches:tt)* } $($rest:tt)*
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) => {
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ele_parse!(@!ele_expand_body <$objty, $($evty)?>
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$nt $qname ($($($ntp)*)?) $($matches)*
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);
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ele_parse! {
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$(type AttrValueError = $evty;)?
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type Object = $objty;
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$($rest)*
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}
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};
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(@!nonterm_def <$objty:ty, $($evty:ty)?> $nt:ident
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($ntref_first:ident $(| $ntref:ident)+); $($rest:tt)*
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) => {
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ele_parse!(@!ele_dfn_sum <$objty>
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$nt [$ntref_first $($ntref)*]
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);
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ele_parse! {
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$(type AttrValueError = $evty;)?
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type Object = $objty;
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$($rest)*
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}
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};
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(@!nonterm_decl <$objty:ty, $($evty:ty)?>) => {};
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// Expand the provided data to a more verbose form that provides the
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// context necessary for state transitions.
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(@!ele_expand_body <$objty:ty, $($evty:ty)?>
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$nt:ident $qname:ident ($($ntp:tt)*)
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@ { $($attrbody:tt)* } => $attrmap:expr,
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$(/$(($close_span:ident))? => $closemap:expr,)?
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// Nonterminal references are provided as a list.
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// A configuration specifier can be provided,
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// currently intended to support the Kleene star.
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$(
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$ntref:ident $([$ntref_cfg:tt])?,
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)*
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) => {
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ele_parse! {
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@!ele_dfn_body <$objty, $($evty)?> $nt $qname ($($ntp)*)
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@ { $($attrbody)* } => $attrmap,
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/$($($close_span)?)? => ele_parse!(@!ele_close $($closemap)?),
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<> {
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$(
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$ntref [$($ntref_cfg)?],
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)*
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}
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// Generate state transitions of the form `(S) -> (S')`.
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-> {
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@ ->
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$(
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($nt::$ntref),
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($nt::$ntref) ->
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)* ($nt::ExpectClose_),
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}
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}
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};
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// No explicit Close mapping defaults to doing nothing at all
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// (so yield Incomplete).
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(@!ele_close) => {
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crate::parse::ParseStatus::Incomplete
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};
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(@!ele_close $close:expr) => {
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crate::parse::ParseStatus::Object($close)
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};
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// NT[*] modifier.
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(@!ntref_cfg *) => {
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crate::parse::Context::from(crate::xir::parse::ele::EleParseCfg {
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repeat: true,
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..Default::default()
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})
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};
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// No bracketed modifier following NT.
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(@!ntref_cfg) => {
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Self::Context::default()
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};
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(@!ele_dfn_body <$objty:ty, $($evty:ty)?>
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$nt:ident $qname:ident ($($open_span:ident)?)
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// Attribute definition special form.
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@ {
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// We must lightly parse attributes here so that we can retrieve
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// the field identifiers that may be later used as bindings in
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// `$attrmap`.
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$(
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$(#[$fattr:meta])*
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$field:ident: ($($fmatch:tt)+) => $fty:ty,
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)*
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} => $attrmap:expr,
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// Close expression
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// (defaulting to Incomplete via @!ele_expand_body).
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/$($close_span:ident)? => $closemap:expr,
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// Nonterminal references.
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<> {
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$(
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$ntref:ident [$($ntref_cfg:tt)?],
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)*
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}
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-> {
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@ -> ($ntfirst:path),
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$(
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($ntprev:path) -> ($ntnext:path),
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)*
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}
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) => {
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paste::paste! {
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crate::attr_parse! {
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$(type ValueError = $evty;)?
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struct [<$nt AttrsState_>] -> [<$nt Attrs_>] {
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$(
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$(#[$fattr])*
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$field: ($($fmatch)+) => $fty,
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)*
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}
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}
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#[doc=concat!("Parser for element [`", stringify!($qname), "`].")]
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#[derive(Debug, PartialEq, Eq, Default)]
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enum $nt {
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#[doc=concat!(
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"Expecting opening tag for element [`",
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stringify!($qname),
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"`]."
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)]
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#[default]
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Expecting_,
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/// Recovery state ignoring all remaining tokens for this
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/// element.
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RecoverEleIgnore_(
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crate::xir::QName,
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crate::xir::OpenSpan,
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crate::xir::flat::Depth
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),
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// Recovery completed because end tag corresponding to the
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// invalid element has been found.
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RecoverEleIgnoreClosed_(crate::xir::QName, crate::xir::CloseSpan),
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/// Recovery state ignoring all tokens when a `Close` is
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/// expected.
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///
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/// This is token-agnostic---it
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/// may be a child element,
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/// but it may be text,
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/// for example.
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CloseRecoverIgnore_(
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(crate::span::Span, crate::xir::flat::Depth),
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crate::span::Span
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),
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/// Parsing element attributes.
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Attrs_(
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(crate::span::Span, crate::xir::flat::Depth),
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[<$nt AttrsState_>]
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),
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$(
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$ntref(
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(crate::span::Span, crate::xir::flat::Depth),
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$ntref
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),
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)*
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ExpectClose_((crate::span::Span, crate::xir::flat::Depth), ()),
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/// Closing tag found and parsing of the element is
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/// complete.
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Closed_(crate::span::Span),
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}
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impl crate::xir::parse::EleParseState for $nt {}
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impl $nt {
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/// [`QName`](crate::xir::QName) of the element recognized
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/// by this parser.
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#[allow(dead_code)] // used by sum parser
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const fn qname() -> crate::xir::QName {
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$qname
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}
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}
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impl std::fmt::Display for $nt {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
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use crate::{
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fmt::{DisplayWrapper, TtQuote},
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xir::fmt::{TtOpenXmlEle, TtCloseXmlEle},
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};
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match self {
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Self::Expecting_ => write!(
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f,
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"expecting opening tag {}",
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TtOpenXmlEle::wrap($qname),
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),
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Self::RecoverEleIgnore_(name, ..)
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| Self::RecoverEleIgnoreClosed_(name, ..) => write!(
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f,
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"attempting to recover by ignoring element \
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with unexpected name {given} \
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(expected {expected})",
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given = TtQuote::wrap(name),
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expected = TtQuote::wrap($qname),
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),
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Self::CloseRecoverIgnore_((_, depth), _) => write!(
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f,
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"attempting to recover by ignoring input \
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until the expected end tag {expected} \
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at depth {depth}",
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expected = TtCloseXmlEle::wrap($qname),
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),
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Self::Attrs_(_, sa) => std::fmt::Display::fmt(sa, f),
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Self::ExpectClose_((_, depth), _) => write!(
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f,
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"expecting closing element {} at depth {depth}",
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TtCloseXmlEle::wrap($qname)
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),
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Self::Closed_(_) => write!(
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f,
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"done parsing element {}",
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TtQuote::wrap($qname)
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),
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$(
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Self::$ntref(_, st) => {
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std::fmt::Display::fmt(st, f)
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},
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)*
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}
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}
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}
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#[derive(Debug, PartialEq)]
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enum [<$nt Error_>] {
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/// An element was expected,
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/// but the name of the element was unexpected.
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UnexpectedEle_(crate::xir::QName, crate::span::Span),
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/// Unexpected input while expecting an end tag for this
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/// element.
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///
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/// The span corresponds to the opening tag.
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CloseExpected_(crate::span::Span, crate::xir::flat::XirfToken),
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Attrs_(crate::xir::parse::AttrParseError<[<$nt AttrsState_>]>),
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$(
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$ntref([<$ntref Error_>]),
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)*
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}
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impl From<crate::xir::parse::AttrParseError<[<$nt AttrsState_>]>>
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for [<$nt Error_>]
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{
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fn from(
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e: crate::xir::parse::AttrParseError<[<$nt AttrsState_>]>
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) -> Self {
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[<$nt Error_>]::Attrs_(e)
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}
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}
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$(
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impl From<[<$ntref Error_>]> for [<$nt Error_>] {
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fn from(e: [<$ntref Error_>]) -> Self {
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[<$nt Error_>]::$ntref(e)
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}
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}
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)*
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impl std::error::Error for [<$nt Error_>] {
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fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
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// TODO
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None
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}
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}
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impl std::fmt::Display for [<$nt Error_>] {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
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use crate::{
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fmt::{DisplayWrapper, TtQuote},
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xir::fmt::{TtOpenXmlEle, TtCloseXmlEle},
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};
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match self {
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Self::UnexpectedEle_(name, _) => write!(
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f,
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"unexpected {unexpected} (expecting {expected})",
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unexpected = TtOpenXmlEle::wrap(name),
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expected = TtOpenXmlEle::wrap($qname),
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),
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Self::CloseExpected_(_, tok) => write!(
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f,
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"expected {}, but found {}",
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TtCloseXmlEle::wrap($qname),
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TtQuote::wrap(tok)
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),
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Self::Attrs_(e) => std::fmt::Display::fmt(e, f),
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$(
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Self::$ntref(e) => std::fmt::Display::fmt(e, f),
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)*
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}
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}
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}
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impl crate::diagnose::Diagnostic for [<$nt Error_>] {
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fn describe(&self) -> Vec<crate::diagnose::AnnotatedSpan> {
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use crate::{
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diagnose::Annotate,
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fmt::{DisplayWrapper, TtQuote},
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parse::Token,
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xir::fmt::{TtCloseXmlEle},
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};
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match self {
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Self::UnexpectedEle_(_, ospan) => ospan.error(
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format!(
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"expected {ele_name} here",
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ele_name = TtQuote::wrap($qname)
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)
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).into(),
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Self::CloseExpected_(span, tok) => vec![
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span.note("element starts here"),
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tok.span().error(format!(
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"expected {}",
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TtCloseXmlEle::wrap($qname),
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)),
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],
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Self::Attrs_(e) => e.describe(),
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$(
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Self::$ntref(e) => e.describe(),
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)*
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}
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}
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}
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impl crate::parse::ParseState for $nt {
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type Token = crate::xir::flat::XirfToken;
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type Object = $objty;
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type Error = [<$nt Error_>];
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type Context = crate::parse::Context<crate::xir::parse::EleParseCfg>;
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fn parse_token(
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self,
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tok: Self::Token,
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cfg: &mut Self::Context,
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) -> crate::parse::TransitionResult<Self> {
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use crate::{
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parse::{EmptyContext, Transition, Transitionable},
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xir::{
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EleSpan,
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flat::XirfToken,
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parse::parse_attrs,
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},
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};
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use $nt::{
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Attrs_, Expecting_, RecoverEleIgnore_,
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CloseRecoverIgnore_, RecoverEleIgnoreClosed_,
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ExpectClose_, Closed_
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};
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match (self, tok) {
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(
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Expecting_,
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XirfToken::Open(qname, span, depth)
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) if qname == $qname => {
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Transition(Attrs_(
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(span.tag_span(), depth),
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parse_attrs(qname, span)
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)).incomplete()
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},
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(
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Closed_(..),
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XirfToken::Open(qname, span, depth)
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) if cfg.repeat && qname == $qname => {
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Transition(Attrs_(
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(span.tag_span(), depth),
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parse_attrs(qname, span)
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)).incomplete()
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},
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(Expecting_, XirfToken::Open(qname, span, depth)) => {
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Transition(RecoverEleIgnore_(qname, span, depth)).err(
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[<$nt Error_>]::UnexpectedEle_(qname, span.name_span())
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)
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},
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(
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RecoverEleIgnore_(qname, _, depth_open),
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XirfToken::Close(_, span, depth_close)
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) if depth_open == depth_close => {
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Transition(RecoverEleIgnoreClosed_(qname, span)).incomplete()
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},
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(Attrs_(meta, sa), tok) => {
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sa.delegate_until_obj(
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tok,
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EmptyContext,
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|sa| Transition(Attrs_(meta, sa)),
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|| unreachable!("see ParseState::delegate_until_obj dead"),
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|#[allow(unused_variables)] sa, attrs| {
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let obj = match attrs {
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// Attribute field bindings for `$attrmap`
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[<$nt Attrs_>] {
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$(
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$field,
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)*
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} => {
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// Optional `OpenSpan` binding
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$(
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use crate::xir::parse::attr::AttrParseState;
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let $open_span = sa.element_span();
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)?
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$attrmap
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},
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};
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Transition($ntfirst(meta, Default::default()))
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.ok(obj)
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}
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)
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},
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$(
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($ntprev(depth, st_inner), tok) => {
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st_inner.delegate(
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tok,
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&mut ele_parse!(@!ntref_cfg $($ntref_cfg)?),
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|si| Transition($ntprev(depth, si)),
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|| Transition($ntnext(depth, Default::default()))
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)
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},
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)*
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|
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// XIRF ensures proper nesting,
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// so we do not need to check the element name.
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(
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ExpectClose_((_, depth), ())
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| CloseRecoverIgnore_((_, depth), _),
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XirfToken::Close(_, span, tok_depth)
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) if tok_depth == depth => {
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$(
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let $close_span = span;
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)?
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$closemap.transition(Closed_(span.tag_span()))
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},
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(ExpectClose_(meta @ (otspan, _), ()), unexpected_tok) => {
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use crate::parse::Token;
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Transition(
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CloseRecoverIgnore_(meta, unexpected_tok.span())
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).err([<$nt Error_>]::CloseExpected_(otspan, unexpected_tok))
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}
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// We're still in recovery,
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// so this token gets thrown out.
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(st @ (RecoverEleIgnore_(..) | CloseRecoverIgnore_(..)), _) => {
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Transition(st).incomplete()
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},
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// TODO: Use `is_accepting` guard if we do not utilize
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// exhaustiveness check.
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(st @ (Closed_(..) | RecoverEleIgnoreClosed_(..)), tok) => {
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Transition(st).dead(tok)
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}
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todo => todo!("{todo:?}"),
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}
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}
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fn is_accepting(&self) -> bool {
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matches!(*self, Self::Closed_(..) | Self::RecoverEleIgnoreClosed_(..))
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}
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}
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}
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};
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|
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(@!ele_dfn_sum <$objty:ty> $nt:ident [$($ntref:ident)*]) => {
|
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$(
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// Provide a (hopefully) helpful error that can be corrected
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|
// rather than any obscure errors that may follow from trying
|
|
// to compose parsers that were not generated with this macro.
|
|
assert_impl_all!($ntref: crate::xir::parse::EleParseState);
|
|
)*
|
|
|
|
paste::paste! {
|
|
#[doc=concat!(
|
|
"Parser expecting one of ",
|
|
$("[`", stringify!($ntref), "`], ",)*
|
|
"."
|
|
)]
|
|
#[derive(Debug, PartialEq, Eq, Default)]
|
|
enum $nt {
|
|
#[default]
|
|
Expecting_,
|
|
/// Recovery state ignoring all remaining tokens for this
|
|
/// element.
|
|
RecoverEleIgnore_(
|
|
crate::xir::QName,
|
|
crate::xir::OpenSpan,
|
|
crate::xir::flat::Depth,
|
|
),
|
|
RecoverEleIgnoreClosed_(crate::xir::QName, crate::xir::CloseSpan),
|
|
$(
|
|
$ntref($ntref),
|
|
)*
|
|
/// Inner element has been parsed and is dead;
|
|
/// this indicates that this parser is also dead.
|
|
Done_,
|
|
}
|
|
|
|
impl std::fmt::Display for $nt {
|
|
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
|
|
use crate::{
|
|
fmt::{DisplayWrapper, ListDisplayWrapper, TtQuote},
|
|
xir::fmt::OpenEleSumList,
|
|
};
|
|
|
|
let ntrefs = [
|
|
$(
|
|
$ntref::qname(),
|
|
)*
|
|
];
|
|
let expected = OpenEleSumList::wrap(&ntrefs);
|
|
|
|
match self {
|
|
Self::Expecting_ => {
|
|
write!(f, "expecting {expected}")
|
|
},
|
|
|
|
Self::RecoverEleIgnore_(name, ..)
|
|
| Self::RecoverEleIgnoreClosed_(name, ..) => write!(
|
|
f,
|
|
"attempting to recover by ignoring element \
|
|
with unexpected name {given} \
|
|
(expected {expected})",
|
|
given = TtQuote::wrap(name),
|
|
),
|
|
|
|
$(
|
|
Self::$ntref(st) => std::fmt::Display::fmt(st, f),
|
|
)*
|
|
|
|
Self::Done_ => write!(f, "done parsing {expected}"),
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Debug, PartialEq)]
|
|
enum [<$nt Error_>] {
|
|
UnexpectedEle_(crate::xir::QName, crate::span::Span),
|
|
$(
|
|
$ntref([<$ntref Error_>]),
|
|
)*
|
|
}
|
|
|
|
$(
|
|
impl From<[<$ntref Error_>]> for [<$nt Error_>] {
|
|
fn from(e: [<$ntref Error_>]) -> Self {
|
|
[<$nt Error_>]::$ntref(e)
|
|
}
|
|
}
|
|
)*
|
|
|
|
impl std::error::Error for [<$nt Error_>] {
|
|
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
|
|
// TODO
|
|
None
|
|
}
|
|
}
|
|
|
|
impl std::fmt::Display for [<$nt Error_>] {
|
|
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
|
|
use crate::{
|
|
fmt::DisplayWrapper,
|
|
xir::fmt::TtOpenXmlEle,
|
|
};
|
|
|
|
match self {
|
|
Self::UnexpectedEle_(qname, _) => {
|
|
write!(f, "unexpected {}", TtOpenXmlEle::wrap(qname))
|
|
},
|
|
$(
|
|
Self::$ntref(e) => std::fmt::Display::fmt(e, f),
|
|
)*
|
|
}
|
|
}
|
|
}
|
|
|
|
impl crate::diagnose::Diagnostic for [<$nt Error_>] {
|
|
fn describe(&self) -> Vec<crate::diagnose::AnnotatedSpan> {
|
|
use crate::{
|
|
diagnose::Annotate,
|
|
fmt::{DisplayWrapper, ListDisplayWrapper, TtQuote},
|
|
xir::fmt::OpenEleSumList,
|
|
};
|
|
|
|
let ntrefs = [
|
|
$(
|
|
$ntref::qname(),
|
|
)*
|
|
];
|
|
let expected = OpenEleSumList::wrap(&ntrefs);
|
|
|
|
match self {
|
|
Self::UnexpectedEle_(qname, span) => {
|
|
span.error(format!(
|
|
"element {name} cannot appear here \
|
|
(expecting {expected})",
|
|
name = TtQuote::wrap(qname),
|
|
)).into()
|
|
},
|
|
|
|
$(
|
|
Self::$ntref(e) => e.describe(),
|
|
)*
|
|
}
|
|
}
|
|
}
|
|
|
|
impl crate::parse::ParseState for $nt {
|
|
type Token = crate::xir::flat::XirfToken;
|
|
type Object = $objty;
|
|
type Error = [<$nt Error_>];
|
|
type Context = crate::parse::Context<crate::xir::parse::EleParseCfg>;
|
|
|
|
fn parse_token(
|
|
self,
|
|
tok: Self::Token,
|
|
cfg: &mut Self::Context,
|
|
) -> crate::parse::TransitionResult<Self> {
|
|
use crate::{
|
|
parse::Transition,
|
|
xir::flat::XirfToken,
|
|
};
|
|
|
|
use $nt::{
|
|
Expecting_, RecoverEleIgnore_,
|
|
RecoverEleIgnoreClosed_, Done_
|
|
};
|
|
|
|
match (self, tok) {
|
|
$(
|
|
(
|
|
Expecting_,
|
|
XirfToken::Open(qname, span, depth)
|
|
) if qname == $ntref::qname() => {
|
|
$ntref::default().delegate(
|
|
XirfToken::Open(qname, span, depth),
|
|
&mut Self::Context::default(),
|
|
|si| Transition(Self::$ntref(si)),
|
|
|| todo!("inner dead (should not happen here)"),
|
|
)
|
|
},
|
|
)*
|
|
|
|
// An unexpected token when repeating ends
|
|
// repetition and should not result in an error.
|
|
(Expecting_, tok) if cfg.repeat => {
|
|
Transition(Done_).dead(tok)
|
|
}
|
|
|
|
(Expecting_, XirfToken::Open(qname, span, depth)) => {
|
|
use crate::xir::EleSpan;
|
|
Transition(RecoverEleIgnore_(qname, span, depth)).err(
|
|
// Use name span rather than full `OpenSpan`
|
|
// since it's specifically the name that
|
|
// was unexpected,
|
|
// not the fact that it's an element.
|
|
[<$nt Error_>]::UnexpectedEle_(qname, span.name_span())
|
|
)
|
|
},
|
|
|
|
// XIRF ensures that the closing tag matches the opening,
|
|
// so we need only check depth.
|
|
(
|
|
RecoverEleIgnore_(qname, _, depth_open),
|
|
XirfToken::Close(_, span, depth_close)
|
|
) if depth_open == depth_close => {
|
|
Transition(RecoverEleIgnoreClosed_(qname, span)).incomplete()
|
|
},
|
|
|
|
(st @ RecoverEleIgnore_(..), _) => {
|
|
Transition(st).incomplete()
|
|
},
|
|
|
|
$(
|
|
(Self::$ntref(si), tok) => si.delegate(
|
|
tok,
|
|
&mut Self::Context::default(),
|
|
|si| Transition(Self::$ntref(si)),
|
|
|| match cfg.repeat {
|
|
true => Transition(Expecting_),
|
|
false => Transition(Done_),
|
|
}
|
|
),
|
|
)*
|
|
|
|
(st @ Self::Done_, tok) => Transition(st).dead(tok),
|
|
|
|
todo => todo!("sum {todo:?}"),
|
|
}
|
|
}
|
|
|
|
fn is_accepting(&self) -> bool {
|
|
match self {
|
|
Self::RecoverEleIgnoreClosed_(..) | Self::Done_ => true,
|
|
|
|
// Delegate entirely to the inner ParseState.
|
|
// It is desirable to maintain this state even after
|
|
// the inner parser is completed so that the inner
|
|
// state can accurately describe what took place.
|
|
// With that said,
|
|
// we will transition to `Done_` on an inner dead
|
|
// state,
|
|
// because of current `delegate` limitations.
|
|
$(
|
|
Self::$ntref(si) => si.is_accepting(),
|
|
)*
|
|
|
|
_ => false,
|
|
}
|
|
}
|
|
}
|
|
}
|
|
};
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod test;
|