137 lines
4.1 KiB
Rust
137 lines
4.1 KiB
Rust
// ASG IR metavariable parsing
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//
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// Copyright (C) 2014-2023 Ryan Specialty, 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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//! AIR metavariable parser.
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//!
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//! See the [parent module](super) for more information.
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use super::{
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super::{AsgError, ObjectIndex},
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ir::AirBindableMeta,
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AirAggregate, AirAggregateCtx,
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};
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use crate::{
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asg::graph::object::Meta, diagnose::Annotate, diagnostic_todo,
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parse::prelude::*,
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};
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/// Metasyntactic variable (metavariable) parser.
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#[derive(Debug, PartialEq)]
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pub enum AirMetaAggregate {
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/// Ready for the start of a metavariable.
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Ready,
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/// Defining a metavariable.
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TplMeta(ObjectIndex<Meta>),
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}
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impl Display for AirMetaAggregate {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
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use AirMetaAggregate::*;
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match self {
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Ready => write!(f, "ready for metavariable"),
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TplMeta(_) => write!(f, "defining metavariable"),
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}
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}
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}
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impl ParseState for AirMetaAggregate {
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type Token = AirBindableMeta;
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type Object = ();
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type Error = AsgError;
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type Context = AirAggregateCtx;
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type Super = AirAggregate;
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fn parse_token(
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self,
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tok: Self::Token,
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ctx: &mut Self::Context,
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) -> TransitionResult<Self::Super> {
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use super::ir::{AirBind::*, AirMeta::*};
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use AirBindableMeta::*;
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use AirMetaAggregate::*;
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match (self, tok) {
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(Ready, AirMeta(MetaStart(span))) => {
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let oi_meta = ctx.asg_mut().create(Meta::new_required(span));
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Transition(TplMeta(oi_meta)).incomplete()
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}
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(TplMeta(oi_meta), AirMeta(MetaEnd(cspan))) => {
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oi_meta.close(ctx.asg_mut(), cspan);
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Transition(Ready).incomplete()
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}
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(TplMeta(oi_meta), AirMeta(MetaLexeme(lexeme))) => Transition(
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TplMeta(oi_meta.assign_lexeme(ctx.asg_mut(), lexeme)),
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)
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.incomplete(),
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(TplMeta(oi_meta), AirBind(BindIdent(name))) => ctx
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.defines(name)
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.and_then(|oi_ident| {
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oi_ident.bind_definition(ctx.asg_mut(), name, oi_meta)
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})
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.map(|_| ())
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.transition(TplMeta(oi_meta)),
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(TplMeta(..), tok @ AirBind(RefIdent(..))) => {
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diagnostic_todo!(
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vec![tok.note("this token")],
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"AirBind in metavar context (param-value)"
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)
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}
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(TplMeta(..), tok @ AirMeta(MetaStart(..))) => {
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diagnostic_todo!(
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vec![tok.note("this token")],
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"AirMeta variant"
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)
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}
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(Ready, tok @ AirMeta(MetaEnd(..))) => {
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diagnostic_todo!(
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vec![tok.note("this token")],
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"unbalanced meta"
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)
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}
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(Ready, tok @ AirMeta(MetaLexeme(..))) => {
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diagnostic_todo!(
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vec![tok.note("this token")],
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"unexpected lexeme"
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)
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}
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// Maybe the bind can be handled by the parent frame.
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(Ready, tok @ AirBind(..)) => Transition(Ready).dead(tok),
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}
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}
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fn is_accepting(&self, _: &Self::Context) -> bool {
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matches!(self, Self::Ready)
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}
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}
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impl AirMetaAggregate {
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pub(super) fn new() -> Self {
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Self::Ready
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}
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}
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