1028 lines
34 KiB
Rust
1028 lines
34 KiB
Rust
use pest::Parser;
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use pest_derive::Parser;
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pub mod ast;
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use ast::*;
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#[derive(Parser)]
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#[grammar = "./src/grammar.pest"]
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pub struct MistParser;
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#[derive(Debug, Clone)]
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pub enum ParseError<'a> {
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PreAst(pest::error::Error<Rule>),
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Ast {
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span: pest::Span<'a>,
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error_code: ErrorCode,
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error_message: String,
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},
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}
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type ParseResult<'a, T> = Result<T, ParseError<'a>>;
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#[derive(Debug, Clone)]
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pub enum ErrorCode {
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InvalidStatement = 200,
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}
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pub fn parse<'a>(source: &'a str) -> ParseResult<'a, Vec<TopLevel>> {
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let mut pairs = MistParser::parse(Rule::program, source)?;
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let mut statements = vec![];
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for pair in pairs.next().unwrap().into_inner() {
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if pair.as_rule() != Rule::EOI {
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statements.push(TopLevel::try_from(pair)?);
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}
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}
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Ok(statements)
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}
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impl From<pest::error::Error<Rule>> for ParseError<'_> {
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fn from(value: pest::error::Error<Rule>) -> Self {
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Self::PreAst(value)
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}
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}
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impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for TypeExpr {
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type Error = ParseError<'a>;
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fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
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let rule = pair.as_rule();
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let mut inner = pair.into_inner();
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match rule {
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Rule::type_expr => Ok(TypeExpr(
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TypeExprKind::try_from(inner.next().unwrap())?,
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inner
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.map(TypePostfix::try_from)
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.collect::<ParseResult<'a, _>>()?,
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)),
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Rule::type_expr_param => Self::try_from(inner.next().unwrap()),
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Rule::lifetime => Ok(TypeExpr(
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TypeExprKind::Lifetime(Identifier::try_from(inner.next().unwrap())?),
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Vec::new(),
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)),
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_ => unimplemented!("{rule:#?}"),
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}
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}
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}
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impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for TypePostfix {
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type Error = ParseError<'a>;
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fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
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let rule = pair.as_rule();
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let mut inner = pair.into_inner();
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match rule {
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Rule::ref_type => {
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let mutable = listen_rule(&mut inner, Rule::mutable);
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let lifetime = consume_rule(&mut inner, Rule::lifetime)
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.map(|pair| Identifier::try_from(pair.into_inner().next().unwrap()))
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.transpose()?;
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Ok(if mutable {
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if let Some(lifetime) = lifetime {
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TypePostfix::RefMutLifetime(lifetime)
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} else {
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TypePostfix::RefMut
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}
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} else {
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if let Some(lifetime) = lifetime {
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TypePostfix::RefLifetime(lifetime)
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} else {
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TypePostfix::Ref
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}
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})
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}
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_ => unimplemented!("{rule:#?}"),
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}
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}
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}
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impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for TypeExprKind {
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type Error = ParseError<'a>;
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fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
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let rule = pair.as_rule();
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let mut inner = pair.into_inner();
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match rule {
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Rule::tuple_type => Ok(TypeExprKind::Tuple(
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inner
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.map(TypeExpr::try_from)
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.collect::<ParseResult<'a, _>>()?,
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)),
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Rule::path_type => {
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let path = Path::try_from(inner.next().unwrap())?;
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let params = inner
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.map(TypeExpr::try_from)
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.collect::<ParseResult<'a, Vec<_>>>()?;
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if params.len() == 0 {
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Ok(TypeExprKind::Path(path))
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} else {
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Ok(TypeExprKind::PathParams(path, params))
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}
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}
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_ => unimplemented!("{rule:#?}"),
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}
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}
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}
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impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Path {
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type Error = ParseError<'a>;
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fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
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match pair.as_rule() {
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Rule::static_path => Ok(Path(
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pair.into_inner()
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.map(Identifier::try_from)
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.collect::<ParseResult<'a, Vec<_>>>()?,
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)),
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_ => unimplemented!("{pair:#?}"),
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}
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}
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}
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impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for ParamList {
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type Error = ParseError<'a>;
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fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
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Ok(ParamList(
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pair.into_inner()
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.map(VarDecl::try_from)
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.collect::<ParseResult<'a, Vec<_>>>()?,
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))
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}
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}
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impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Attribute {
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type Error = ParseError<'a>;
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fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
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match pair.as_rule() {
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Rule::attribute => {
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// unwrap #[ ... ]
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Attribute::try_from(pair.into_inner().next().unwrap())
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}
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Rule::meta => {
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let mut inner = pair.into_inner();
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// first item is always the path
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let path = Path::try_from(inner.next().unwrap())?;
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// check what comes next
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match inner.next() {
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None => {
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// #[path]
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Ok(Attribute::Path(path))
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}
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Some(next) => match next.as_rule() {
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Rule::primary => {
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// #[path = literal]
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Ok(Attribute::NameValue {
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path,
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value: Literal::try_from(next)?,
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})
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}
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Rule::meta_list => {
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// #[path(...)]
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let items = next
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.into_inner()
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.map(Attribute::try_from)
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.collect::<ParseResult<'a, Vec<_>>>()?;
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Ok(Attribute::List { path, items })
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}
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_ => unreachable!("unexpected rule in meta: {:?}", next.as_rule()),
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},
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}
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}
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Rule::meta_list => {
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// This case usually won't be hit directly,
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// but it's nice to keep it safe if reused
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let items = pair
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.into_inner()
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.map(Attribute::try_from)
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.collect::<Vec<_>>();
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// NOTE: this shouldn't normally construct an Attribute alone
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// but you can panic or wrap depending on your design
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panic!("meta_list should be handled inside meta: {:?}", items);
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}
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_ => unreachable!("unexpected rule: {:?}", pair.as_rule()),
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}
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}
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}
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impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for TopLevel {
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type Error = ParseError<'a>;
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fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
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let mut inner = pair.into_inner();
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let attributes = inner
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.next()
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.unwrap()
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.into_inner()
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.map(Attribute::try_from)
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.collect::<ParseResult<'a, Vec<_>>>()?;
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Ok(TopLevel(
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inner
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.next()
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.map(TopLevelKind::try_from)
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.unwrap_or(Ok(TopLevelKind::ModAttribute))?,
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attributes,
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))
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}
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}
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impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for StatementBranch {
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type Error = ParseError<'a>;
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fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
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let mut inner = pair.into_inner();
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let condition = Expression::try_from(inner.next().unwrap())?;
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let body = Statement::try_from(inner.next().unwrap())?;
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Ok(StatementBranch {
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condition,
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body: Box::new(body),
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})
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}
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}
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impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for ClassConstructor {
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type Error = ParseError<'a>;
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fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
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let mut inner = pair.into_inner();
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let visibility = Visibility::try_from(&mut inner)?;
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let generics = consume_rule(&mut inner, Rule::generics)
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.map(Generics::try_from)
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.transpose()?
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.unwrap_or_default();
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let params = consume_rule(&mut inner, Rule::param_list)
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.map(ParamList::try_from)
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.transpose()?
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.unwrap_or_default();
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Ok(Self {
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visibility,
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generics,
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params,
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body: Block::try_from(inner.next().unwrap())?,
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})
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}
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}
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impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Generics {
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type Error = ParseError<'a>;
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fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
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let rule = pair.as_rule();
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let inner = pair.clone().into_inner();
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match rule {
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Rule::generics => Ok(Generics(
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inner
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.map(|pair| -> ParseResult<'a, Generic> {
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let mut inner = pair.into_inner();
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Ok(
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if let Some(pair) = consume_rule(&mut inner, Rule::lifetime) {
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Generic::Lifetime(Identifier::try_from(
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pair.into_inner().next().unwrap(),
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)?)
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} else {
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Generic::Type(
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Identifier::try_from(inner.next().unwrap())?,
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inner
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.map(TypeExpr::try_from)
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.collect::<ParseResult<'a, Vec<_>>>()?,
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)
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},
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)
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})
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.collect::<ParseResult<'a, Vec<_>>>()?,
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)),
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_ => unimplemented!("{rule:#?}"),
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}
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}
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}
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impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for TopLevelKind {
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type Error = ParseError<'a>;
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fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
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let rule = pair.as_rule();
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let mut inner = pair.clone().into_inner();
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Ok(match rule {
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Rule::import => TopLevelKind::Import(
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Visibility::try_from(&mut inner)?,
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Path::try_from(inner.next().unwrap())?,
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),
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Rule::function_decl => TopLevelKind::FunctionDecl(FunctionDecl::try_from(pair)?),
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Rule::struct_decl => TopLevelKind::StructDecl {
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visibility: Visibility::try_from(&mut inner)?,
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name: Identifier::try_from(inner.next().unwrap())?,
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generics: consume_rule(&mut inner, Rule::generics)
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.map(Generics::try_from)
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.transpose()?
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.unwrap_or_default(),
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fields: inner
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.next()
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.map(|pair| {
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pair.into_inner()
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.map(FieldDecl::try_from)
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.collect::<ParseResult<'a, Vec<_>>>()
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})
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.transpose()?
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.unwrap_or_default(),
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},
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Rule::class_decl => TopLevelKind::ClassDecl {
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visibility: Visibility::try_from(&mut inner)?,
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name: Identifier::try_from(inner.next().unwrap())?,
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generics: consume_rule(&mut inner, Rule::generics)
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.map(Generics::try_from)
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.transpose()?
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.unwrap_or_default(),
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fields: inner
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.next()
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.unwrap()
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.into_inner()
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.map(FieldDeclStmt::try_from)
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.collect::<ParseResult<'a, Vec<_>>>()?,
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constructor: ClassConstructor::try_from(inner.next().unwrap())?,
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items: inner
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.into_iter()
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.map(ClassItem::try_from)
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.collect::<ParseResult<'a, Vec<_>>>()?,
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},
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Rule::enum_decl => TopLevelKind::EnumDecl {
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visibility: Visibility::try_from(&mut inner)?,
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name: Identifier::try_from(inner.next().unwrap())?,
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generics: consume_rule(&mut inner, Rule::generics)
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.map(Generics::try_from)
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.transpose()?
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.unwrap_or_default(),
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fields: inner
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.map(EnumItem::try_from)
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.collect::<ParseResult<'a, Vec<_>>>()?,
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},
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Rule::mod_package => TopLevelKind::Mod(
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Visibility::try_from(&mut inner)?,
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Identifier::try_from(inner.next().unwrap())?,
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),
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Rule::impl_for_decl | Rule::impl_decl => {
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TopLevelKind::ImplDecl(ImplDecl::try_from(pair)?)
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}
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Rule::trait_decl => TopLevelKind::TraitDecl {
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visibility: Visibility::try_from(&mut inner)?,
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name: Identifier::try_from(inner.next().unwrap())?,
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generics: consume_rule(&mut inner, Rule::generics)
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.map(Generics::try_from)
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.transpose()?
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.unwrap_or_default(),
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requirements: consume_rule(&mut inner, Rule::trait_requirements)
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.map(|pair| {
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pair.into_inner()
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.map(TypeExpr::try_from)
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.collect::<ParseResult<'a, Vec<_>>>()
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})
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.transpose()?
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.unwrap_or_default(),
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items: inner
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.map(FunctionDecl::try_from)
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.collect::<ParseResult<'a, Vec<_>>>()?,
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},
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_ => unimplemented!("{rule:#?}"),
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})
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}
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}
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impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for ClassItem {
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type Error = ParseError<'a>;
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fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
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let rule = pair.as_rule();
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match rule {
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Rule::impl_decl | Rule::impl_for_decl => {
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Ok(ClassItem::ImplDecl(ImplDecl::try_from(pair)?))
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}
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Rule::method => Ok(ClassItem::Method(FunctionDecl::try_from(pair)?)),
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|
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_ => unimplemented!("{rule:#?}"),
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}
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}
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}
|
|
|
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impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for ImplDecl {
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type Error = ParseError<'a>;
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|
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fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
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let rule = pair.as_rule();
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let mut inner = pair.clone().into_inner();
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|
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match rule {
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Rule::impl_for_decl => Ok(ImplDecl {
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generics: consume_rule(&mut inner, Rule::generics)
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.map(Generics::try_from)
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.transpose()?
|
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.unwrap_or_default(),
|
|
trait_: Some(TypeExpr::try_from(inner.next().unwrap())?),
|
|
target: TypeExpr::try_from(inner.next().unwrap())?,
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methods: inner
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.map(FunctionDecl::try_from)
|
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.collect::<ParseResult<'a, Vec<_>>>()?,
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}),
|
|
|
|
Rule::impl_decl => Ok(ImplDecl {
|
|
generics: consume_rule(&mut inner, Rule::generics)
|
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.map(Generics::try_from)
|
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.transpose()?
|
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.unwrap_or_default(),
|
|
trait_: None,
|
|
target: TypeExpr::try_from(inner.next().unwrap())?,
|
|
methods: inner
|
|
.map(FunctionDecl::try_from)
|
|
.collect::<ParseResult<'a, Vec<_>>>()?,
|
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}),
|
|
|
|
_ => unimplemented!("{rule:#?}"),
|
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}
|
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}
|
|
}
|
|
|
|
impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for EnumItem {
|
|
type Error = ParseError<'a>;
|
|
|
|
fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
|
|
let rule = pair.as_rule();
|
|
let mut inner = pair.clone().into_inner();
|
|
|
|
match rule {
|
|
Rule::enum_named => Ok(EnumItem::Named(Identifier::try_from(
|
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inner.next().unwrap(),
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)?)),
|
|
|
|
Rule::enum_tuple => Ok(EnumItem::Tuple(
|
|
Identifier::try_from(inner.next().unwrap())?,
|
|
inner
|
|
.next()
|
|
.unwrap()
|
|
.into_inner()
|
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.map(TypeExpr::try_from)
|
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.collect::<ParseResult<'a, Vec<_>>>()?,
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)),
|
|
|
|
Rule::enum_struct => Ok(EnumItem::Struct(
|
|
Identifier::try_from(inner.next().unwrap())?,
|
|
inner
|
|
.next()
|
|
.map(|pair| {
|
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pair.into_inner()
|
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.map(FieldDecl::try_from)
|
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.collect::<ParseResult<'a, Vec<_>>>()
|
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})
|
|
.transpose()?
|
|
.unwrap_or_default(),
|
|
)),
|
|
|
|
_ => unimplemented!("{rule:#?}"),
|
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}
|
|
}
|
|
}
|
|
|
|
impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Block {
|
|
type Error = ParseError<'a>;
|
|
|
|
fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
|
|
let statements = pair
|
|
.into_inner()
|
|
.flat_map(|pair| {
|
|
if pair.as_rule() == Rule::statement_list {
|
|
pair.into_inner().map(Statement::try_from).collect()
|
|
} else {
|
|
vec![Statement::try_from(pair)]
|
|
}
|
|
})
|
|
.collect::<ParseResult<'a, Vec<_>>>()?;
|
|
|
|
Ok(Block(statements))
|
|
}
|
|
}
|
|
|
|
impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Statement {
|
|
type Error = ParseError<'a>;
|
|
|
|
fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
|
|
let rule = pair.as_rule();
|
|
let mut inner = pair.clone().into_inner();
|
|
|
|
Ok(match rule {
|
|
Rule::statement => Statement::try_from(inner.next().unwrap())?,
|
|
|
|
Rule::expr_stmt => Statement::Expression(Expression::try_from(inner.next().unwrap())?),
|
|
|
|
Rule::block => Statement::Block(Block::try_from(inner.next().unwrap())?),
|
|
|
|
Rule::var_decl_statement => Statement::VarDecl(VarDeclStmt::try_from(pair)?),
|
|
|
|
Rule::return_stmt => {
|
|
Statement::Return(inner.next().map(Expression::try_from).transpose()?)
|
|
}
|
|
|
|
Rule::break_stmt => Statement::Break,
|
|
|
|
Rule::continue_stmt => Statement::Continue,
|
|
|
|
Rule::if_stmt => {
|
|
let mut inner = inner.skip(2);
|
|
|
|
Statement::If {
|
|
initial: StatementBranch::try_from(pair)?,
|
|
else_if: inner
|
|
.next()
|
|
.unwrap()
|
|
.into_inner()
|
|
.map(StatementBranch::try_from)
|
|
.collect::<ParseResult<'a, Vec<_>>>()?,
|
|
else_branch: inner
|
|
.next()
|
|
.map(Statement::try_from)
|
|
.transpose()?
|
|
.map(Box::new),
|
|
}
|
|
}
|
|
|
|
Rule::while_stmt => Statement::While(pair.try_into()?),
|
|
|
|
Rule::c_for_stmt => Statement::CStyleFor {
|
|
init: Box::new(Statement::try_from(inner.next().unwrap())?),
|
|
condition: inner.next().unwrap().try_into()?,
|
|
update: Box::new(Statement::try_from(inner.next().unwrap())?),
|
|
body: Box::new(Statement::try_from(inner.next().unwrap())?),
|
|
},
|
|
|
|
Rule::for_stmt => Statement::For {
|
|
mutable: listen_rule(&mut inner, Rule::mutable),
|
|
pattern: Pattern::try_from(inner.next().unwrap())?,
|
|
iterator: inner.next().unwrap().try_into()?,
|
|
body: Box::new(Statement::try_from(inner.next().unwrap())?),
|
|
},
|
|
|
|
Rule::assign_statement => Statement::VarAssign(VarAssignStmt {
|
|
target: Expression::try_from(inner.next().unwrap())?,
|
|
value: Expression::try_from(inner.next().unwrap())?,
|
|
}),
|
|
|
|
Rule::match_stmt => Statement::Match(
|
|
Expression::try_from(inner.next().unwrap())?,
|
|
inner
|
|
.map(|match_itms| {
|
|
let mut match_inner = match_itms.into_inner();
|
|
Ok((
|
|
Pattern::try_from(match_inner.next().unwrap())?,
|
|
Block::try_from(match_inner.next().unwrap())?,
|
|
))
|
|
})
|
|
.collect::<ParseResult<'a, Vec<_>>>()?,
|
|
),
|
|
|
|
Rule::unexpected_statement => {
|
|
return Err(ParseError::Ast {
|
|
span: pair.as_span(),
|
|
error_code: ErrorCode::InvalidStatement,
|
|
error_message: "Invalid Statement".to_string(),
|
|
});
|
|
}
|
|
|
|
_ => unimplemented!("{rule:#?}"),
|
|
})
|
|
}
|
|
}
|
|
|
|
impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Literal {
|
|
type Error = ParseError<'a>;
|
|
|
|
fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
|
|
let rule = pair.as_rule();
|
|
let mut inner = pair.clone().into_inner();
|
|
|
|
Ok(match rule {
|
|
Rule::primary => Self::try_from(inner.next().unwrap())?,
|
|
Rule::literal => Self::try_from(inner.next().unwrap())?,
|
|
Rule::integer => Literal::Int(pair.as_str().parse::<i64>().unwrap()),
|
|
Rule::float => Literal::Float(pair.as_str().parse::<f64>().unwrap()),
|
|
Rule::boolean => Literal::Bool(pair.as_str().parse::<bool>().unwrap()),
|
|
Rule::string_lit => Literal::String(inner.as_str().to_string()),
|
|
Rule::tuple => Literal::Tuple(
|
|
inner
|
|
.map(Expression::try_from)
|
|
.collect::<ParseResult<'a, Vec<_>>>()?,
|
|
),
|
|
_ => unimplemented!("{rule:#?}"),
|
|
})
|
|
}
|
|
}
|
|
|
|
impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Expression {
|
|
type Error = ParseError<'a>;
|
|
|
|
fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
|
|
let rule = pair.as_rule();
|
|
let mut inner = pair.clone().into_inner();
|
|
|
|
match rule {
|
|
Rule::expr => {
|
|
let prefixes: Vec<Prefix> = inner
|
|
.next()
|
|
.map(|p| {
|
|
p.into_inner()
|
|
.into_iter()
|
|
.map(Prefix::try_from)
|
|
.collect::<ParseResult<'a, Vec<_>>>()
|
|
})
|
|
.transpose()?
|
|
.unwrap_or_default();
|
|
|
|
let exp = Expression::try_from(inner.next().unwrap())?;
|
|
|
|
if inner.len() > 0 || prefixes.len() > 0 {
|
|
Ok(Expression::Fix {
|
|
initial: Box::new(exp),
|
|
prefixes,
|
|
postfixes: inner
|
|
.map(|p| Postfix::try_from(p))
|
|
.collect::<ParseResult<'a, Vec<_>>>()?,
|
|
})
|
|
} else {
|
|
Ok(exp)
|
|
}
|
|
}
|
|
Rule::primary => Expression::try_from(inner.next().unwrap()),
|
|
Rule::static_path => Ok(Expression::Path(Path::try_from(pair)?)),
|
|
Rule::literal => Ok(Expression::Literal(Literal::try_from(pair)?)),
|
|
_ => unimplemented!("{rule:#?}"),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Prefix {
|
|
type Error = ParseError<'a>;
|
|
|
|
fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
|
|
Ok(match pair.as_rule() {
|
|
Rule::prefix => Self::try_from(pair.into_inner().next().unwrap())?,
|
|
Rule::deref_px => Self::Deref,
|
|
Rule::mut_ref_px => Self::RefMut,
|
|
Rule::ref_px => Self::Ref,
|
|
Rule::new_px => Self::New,
|
|
Rule::not_px => Self::Not,
|
|
_ => unimplemented!("{pair:#?}"),
|
|
})
|
|
}
|
|
}
|
|
|
|
impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Postfix {
|
|
type Error = ParseError<'a>;
|
|
|
|
fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
|
|
let rule = pair.as_rule();
|
|
let mut inner = pair.into_inner();
|
|
|
|
Ok(match rule {
|
|
Rule::postfix => Postfix::try_from(inner.next().unwrap())?,
|
|
|
|
Rule::field_px => Postfix::FieldAccess(Identifier::try_from(inner.next().unwrap())?),
|
|
|
|
Rule::call_px => Postfix::Call(
|
|
inner
|
|
.map(Expression::try_from)
|
|
.collect::<ParseResult<'a, Vec<_>>>()?,
|
|
),
|
|
|
|
Rule::struct_px => Postfix::StructCall(
|
|
inner
|
|
.map(|p| {
|
|
let mut pi = p.into_inner();
|
|
Ok((
|
|
Identifier::try_from(pi.next().unwrap())?,
|
|
Expression::try_from(pi.next().unwrap())?,
|
|
))
|
|
})
|
|
.collect::<ParseResult<'a, Vec<_>>>()?,
|
|
),
|
|
|
|
Rule::index_px => Postfix::Index(Expression::try_from(inner.next().unwrap())?),
|
|
|
|
Rule::binary_px => {
|
|
let op_pair = inner.next().unwrap();
|
|
let op = match op_pair.as_str() {
|
|
"+" => BinaryOp::Plus,
|
|
"-" => BinaryOp::Minus,
|
|
"*" => BinaryOp::Multiply,
|
|
"/" => BinaryOp::Divide,
|
|
"%" => BinaryOp::Modulo,
|
|
"==" => BinaryOp::Equal,
|
|
"!=" => BinaryOp::NotEqual,
|
|
"<" => BinaryOp::LessThan,
|
|
">" => BinaryOp::GreaterThan,
|
|
"<=" => BinaryOp::LessThanOrEqual,
|
|
">=" => BinaryOp::GreaterThanOrEqual,
|
|
"&&" => BinaryOp::And,
|
|
"||" => BinaryOp::Or,
|
|
|
|
_ => {
|
|
unimplemented!("Binary operator not implemented yet: {}", op_pair.as_str())
|
|
}
|
|
};
|
|
Postfix::Binary(op, Expression::try_from(inner.next().unwrap())?)
|
|
}
|
|
|
|
Rule::macro_call_px => Postfix::MacroCall(inner.as_str().to_string()),
|
|
|
|
_ => unimplemented!("{rule:#?}"),
|
|
})
|
|
}
|
|
}
|
|
|
|
impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for VarDeclStmt {
|
|
type Error = ParseError<'a>;
|
|
|
|
fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
|
|
match pair.as_rule() {
|
|
Rule::var_decl_statement => {
|
|
let mut inner = pair.into_inner();
|
|
|
|
let decl = VarDecl::try_from(inner.next().unwrap())?;
|
|
|
|
let init = inner.next().map(Expression::try_from).transpose()?;
|
|
|
|
Ok(VarDeclStmt { decl, init })
|
|
}
|
|
|
|
_ => unimplemented!(),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for FieldDeclStmt {
|
|
type Error = ParseError<'a>;
|
|
|
|
fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
|
|
match pair.as_rule() {
|
|
Rule::class_field => {
|
|
let mut inner = pair.into_inner();
|
|
|
|
let decl = FieldDecl::try_from(inner.next().unwrap())?;
|
|
|
|
let init = inner.next().map(Expression::try_from).transpose()?;
|
|
|
|
Ok(FieldDeclStmt { decl, init })
|
|
}
|
|
|
|
_ => unimplemented!(),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Pattern {
|
|
type Error = ParseError<'a>;
|
|
|
|
fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
|
|
let rule = pair.as_rule();
|
|
let mut inner = pair.clone().into_inner();
|
|
|
|
Ok(match rule {
|
|
Rule::tuple_pattern => Pattern::Tuple(
|
|
inner
|
|
.map(Identifier::try_from)
|
|
.collect::<ParseResult<'a, Vec<_>>>()?,
|
|
),
|
|
|
|
Rule::named_tuple_pattern => Pattern::NamedTuple(
|
|
Path::try_from(inner.next().unwrap())?,
|
|
inner
|
|
.map(Identifier::try_from)
|
|
.collect::<ParseResult<'a, Vec<_>>>()?,
|
|
),
|
|
|
|
Rule::struct_pattern => Pattern::Struct(
|
|
Path::try_from(inner.next().unwrap())?,
|
|
inner
|
|
.map(Identifier::try_from)
|
|
.collect::<ParseResult<'a, Vec<_>>>()?,
|
|
),
|
|
|
|
Rule::literal => Pattern::Literal(Literal::try_from(pair)?),
|
|
|
|
Rule::identifier => Pattern::Id(Identifier::try_from(pair)?),
|
|
|
|
Rule::static_path => Pattern::Path(Path::try_from(pair)?),
|
|
|
|
_ => unimplemented!("{rule:?}"),
|
|
})
|
|
}
|
|
}
|
|
|
|
impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for VarDecl {
|
|
type Error = ParseError<'a>;
|
|
|
|
fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
|
|
match pair.as_rule() {
|
|
Rule::var_decl => {
|
|
let mut inner = pair.into_inner();
|
|
|
|
let type_ = inner
|
|
.next()
|
|
.and_then(|pair| {
|
|
if pair.as_str().trim() == "var" {
|
|
None
|
|
} else {
|
|
Some(TypeExpr::try_from(pair))
|
|
}
|
|
})
|
|
.transpose()?;
|
|
|
|
let mutable = listen_rule(&mut inner, Rule::mutable);
|
|
|
|
let name = Pattern::try_from(inner.next().unwrap())?;
|
|
|
|
Ok(VarDecl {
|
|
mutable,
|
|
name,
|
|
type_,
|
|
})
|
|
}
|
|
|
|
_ => unimplemented!("{:?}", pair.as_rule()),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for FieldDecl {
|
|
type Error = ParseError<'a>;
|
|
|
|
fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
|
|
match pair.as_rule() {
|
|
Rule::field => {
|
|
let mut inner = pair.into_inner();
|
|
|
|
let visibility = Visibility::try_from(&mut inner)?;
|
|
let type_ = TypeExpr::try_from(inner.next().unwrap())?;
|
|
let name = Identifier::try_from(inner.next().unwrap())?;
|
|
|
|
Ok(FieldDecl {
|
|
visibility,
|
|
type_,
|
|
name,
|
|
})
|
|
}
|
|
|
|
_ => unimplemented!("{:?}", pair.as_rule()),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for FunctionDecl {
|
|
type Error = ParseError<'a>;
|
|
|
|
fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
|
|
let mut inner = pair.into_inner();
|
|
let visibility = Visibility::try_from(&mut inner)?;
|
|
let return_type = TypeExpr::try_from(inner.next().unwrap())?;
|
|
let name = Identifier::try_from(inner.next().unwrap())?;
|
|
let generics = consume_rule(&mut inner, Rule::generics)
|
|
.map(Generics::try_from)
|
|
.transpose()?
|
|
.unwrap_or_default();
|
|
|
|
let self_param = consume_rule(&mut inner, Rule::self_param).map(|param| {
|
|
let mut param_inner = param.into_inner();
|
|
let name = Pattern::Id(Identifier(String::from("self")));
|
|
|
|
let mutable = listen_rule(&mut param_inner, Rule::mutable);
|
|
|
|
let is_ref = listen_rule(&mut param_inner, Rule::deref_px);
|
|
|
|
VarDecl {
|
|
mutable: mutable && !is_ref,
|
|
name: name.clone(),
|
|
type_: Some(TypeExpr(
|
|
TypeExprKind::Path(Path(vec![Identifier("Self".to_string())])),
|
|
if is_ref {
|
|
vec![if mutable {
|
|
TypePostfix::RefMut
|
|
} else {
|
|
TypePostfix::Ref
|
|
}]
|
|
} else {
|
|
Vec::new()
|
|
},
|
|
)),
|
|
}
|
|
});
|
|
|
|
let params = consume_rule(&mut inner, Rule::param_list)
|
|
.map({
|
|
let self_param = self_param.clone();
|
|
|params_pair| -> ParseResult<'a, ParamList> {
|
|
let mut params = ParamList::try_from(params_pair)?;
|
|
if let Some(x) = self_param {
|
|
params.0.insert(0, x);
|
|
}
|
|
Ok(params)
|
|
}
|
|
})
|
|
.transpose()?
|
|
.unwrap_or_else(|| ParamList(self_param.into_iter().collect()));
|
|
|
|
let body = inner.next().map(Block::try_from).transpose()?;
|
|
|
|
Ok(Self {
|
|
visibility,
|
|
name,
|
|
generics,
|
|
params,
|
|
return_type,
|
|
body,
|
|
})
|
|
}
|
|
}
|
|
impl<'a> TryFrom<&mut pest::iterators::Pairs<'a, Rule>> for Visibility {
|
|
type Error = ParseError<'a>;
|
|
|
|
fn try_from(pairs: &mut pest::iterators::Pairs<'a, Rule>) -> Result<Self, Self::Error> {
|
|
Ok(consume_rule(pairs, Rule::visibility)
|
|
.map(|pair| -> Result<Visibility, ParseError<'a>> {
|
|
if let Some(path) = pair.into_inner().next() {
|
|
Ok(Visibility::PublicTarget(Path::try_from(path)?))
|
|
} else {
|
|
Ok(Visibility::Public)
|
|
}
|
|
})
|
|
.transpose()?
|
|
.unwrap_or_else(|| Visibility::Private))
|
|
}
|
|
}
|
|
|
|
pub fn listen_rule(pairs: &mut pest::iterators::Pairs<'_, Rule>, rule: Rule) -> bool {
|
|
let consumed = pairs
|
|
.peek()
|
|
.map(|p| p.as_rule() == rule)
|
|
.unwrap_or_default();
|
|
|
|
if consumed {
|
|
pairs.next();
|
|
}
|
|
|
|
consumed
|
|
}
|
|
|
|
pub fn consume_rule<'a>(
|
|
pairs: &mut pest::iterators::Pairs<'a, Rule>,
|
|
rule: Rule,
|
|
) -> Option<pest::iterators::Pair<'a, Rule>> {
|
|
let consumed = pairs
|
|
.peek()
|
|
.map(|p| p.as_rule() == rule)
|
|
.unwrap_or_default();
|
|
|
|
if consumed { pairs.next() } else { None }
|
|
}
|
|
|
|
impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Identifier {
|
|
type Error = ParseError<'a>;
|
|
|
|
fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
|
|
Ok(Identifier(pair.as_str().to_string()))
|
|
}
|
|
}
|