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https://forge.katzen.cafe/katzen-cafe/iowo.git
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pawarser(setup): basic parser stuff and types around it. also, a builder.
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@ -1,9 +1,15 @@
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#![feature(iter_collect_into)]
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pub mod parser {
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use std::cell::Cell;
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use enumset::{EnumSet, EnumSetType};
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use self::{error::SyntaxError, event::Event, input::Input};
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pub mod input {
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use enumset::{EnumSet, EnumSetType};
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struct Input<'src, 'toks, SyntaxKind: EnumSetType + Into<rowan::SyntaxKind>> {
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pub struct Input<'src, 'toks, SyntaxKind: EnumSetType + Into<rowan::SyntaxKind>> {
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raw: &'toks Vec<(SyntaxKind, &'src str)>,
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// enumset of meaningless tokens
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semantically_meaningless: EnumSet<SyntaxKind>,
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@ -36,4 +42,125 @@ pub mod parser {
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}
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}
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}
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mod event {
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use enumset::EnumSetType;
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use super::error::SyntaxError;
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pub enum Event<SyntaxKind: EnumSetType + Into<rowan::SyntaxKind>, SyntaxErr: SyntaxError> {
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Start {
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kind: NodeKind<SyntaxKind, SyntaxErr>,
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forward_parent: Option<usize>,
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},
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Finish,
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Eat {
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count: usize,
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},
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}
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impl<SyntaxKind: EnumSetType + Into<rowan::SyntaxKind>, SyntaxErr: SyntaxError>
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Event<SyntaxKind, SyntaxErr>
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{
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pub fn tombstone() -> Self {
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Self::Start {
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kind: NodeKind::Tombstone,
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forward_parent: None,
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}
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}
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}
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pub enum NodeKind<SyntaxKind: EnumSetType + Into<rowan::SyntaxKind>, SyntaxErr: SyntaxError> {
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Tombstone,
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Syntax(SyntaxKind),
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Error(SyntaxErr),
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}
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impl<SyntaxKind: EnumSetType + Into<rowan::SyntaxKind>, SyntaxErr: SyntaxError>
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NodeKind<SyntaxKind, SyntaxErr>
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{
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pub fn is_tombstone(&self) -> bool {
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matches!(self, Self::Tombstone)
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}
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pub fn is_syntax(&self) -> bool {
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matches!(self, Self::Syntax(_))
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}
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pub fn is_error(&self) -> bool {
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matches!(self, Self::Error(_))
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}
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}
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}
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mod error {
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/// A marker trait... for now!
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// TODO: constrain that conversion to `NodeKind::Error` is enforced to be possible
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pub trait SyntaxError {}
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}
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pub struct Parser<
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'src,
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'toks,
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SyntaxKind: EnumSetType + Into<rowan::SyntaxKind>,
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SyntaxErr: SyntaxError,
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> {
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input: Input<'src, 'toks, SyntaxKind>,
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pos: usize,
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events: Vec<Event<SyntaxKind, SyntaxErr>>,
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step_limit: u32,
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steps: Cell<u32>,
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}
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pub struct ParserBuilder<
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'src,
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'toks,
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SyntaxKind: EnumSetType + Into<rowan::SyntaxKind>,
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// SyntaxErr: SyntaxError,
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> {
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raw_toks: &'toks Vec<(SyntaxKind, &'src str)>,
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meaningless_token_kinds: EnumSet<SyntaxKind>,
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step_limit: u32,
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}
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impl<'src, 'toks, SyntaxKind: EnumSetType + Into<rowan::SyntaxKind>>
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ParserBuilder<'src, 'toks, SyntaxKind>
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{
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pub fn new(raw_toks: &'toks Vec<(SyntaxKind, &'src str)>) -> Self {
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Self {
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raw_toks,
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meaningless_token_kinds: EnumSet::new(),
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step_limit: 4096,
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}
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}
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/// Sets the parser step limit.
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/// Defaults to 4096
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pub fn step_limit(mut self, new: u32) -> Self {
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self.step_limit = new;
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self
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}
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pub fn add_meaningless(mut self, kind: SyntaxKind) -> Self {
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self.meaningless_token_kinds.insert(kind);
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self
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}
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pub fn add_meaningless_many(mut self, kind: Vec<SyntaxKind>) -> Self {
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self.meaningless_token_kinds
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.insert_all(kind.into_iter().collect());
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self
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}
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pub fn build<SyntaxErr: SyntaxError>(self) -> Parser<'src, 'toks, SyntaxKind, SyntaxErr> {
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let Self {
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raw_toks,
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meaningless_token_kinds,
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step_limit,
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} = self;
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Parser {
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input: Input::new(raw_toks, Some(meaningless_token_kinds)),
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pos: 0,
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events: Vec::new(),
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step_limit,
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steps: Cell::new(0),
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}
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}
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}
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}
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