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lang: rewrite parser

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This commit is contained in:
Schrottkatze 2024-04-24 11:07:38 +02:00
parent 6d8b79e8f7
commit 381ab45edc
Signed by: schrottkatze
SSH key fingerprint: SHA256:hXb3t1vINBFCiDCmhRABHX5ocdbLiKyCdKI4HK2Rbbc
25 changed files with 524 additions and 1161 deletions
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24
crates/lang/src/parser/ast.rs
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@ -1,24 +0,0 @@
use std::collections::{BTreeMap, HashMap};
use indexmap::IndexMap;
use super::Spanned;
#[derive(Debug, PartialEq)]
pub struct File<'src> {
pub decls: IndexMap<Spanned<&'src str>, raw_ast::RawExpression<'src>>,
}
pub mod raw_ast;
#[derive(Debug, PartialEq)]
pub enum Lit<'src> {
// TODO: more bigger better number types
Int(i64),
Float(f64),
String(&'src str),
}
pub mod lossless;
pub mod ast_tree;

31
crates/lang/src/parser/ast/ast_tree.rs
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@ -1,31 +0,0 @@
use ego_tree::Tree;
use crate::parser::Spanned;
use super::{File, Lit};
pub struct Ast<'src> {
tree: Tree<AstNode<'src>>,
}
struct AstNode<'src> {
kind: NodeKind<'src>,
}
enum NodeKind<'src> {
Decl,
Ident(&'src str),
Instr,
Expr,
MappingPipe,
NullPipe,
MultiPipe,
Var(&'src str),
InputVar(&'src str),
AttrSet,
Attr,
Lit(Lit<'src>),
Matrix,
Dimensions(u16, u16),
MatrixRow,
}

19
crates/lang/src/parser/ast/lossless.rs
View file

@ -1,19 +0,0 @@
use self::lex::SyntaxKind;
pub mod parser;
pub mod lex;
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
enum Lang {}
impl rowan::Language for Lang {
type Kind = SyntaxKind;
#[allow(unsafe_code)]
fn kind_from_raw(raw: rowan::SyntaxKind) -> Self::Kind {
assert!(raw.0 <= SyntaxKind::ROOT as u16);
unsafe { std::mem::transmute::<u16, SyntaxKind>(raw.0) }
}
fn kind_to_raw(kind: Self::Kind) -> rowan::SyntaxKind {
kind.into()
}
}

290
crates/lang/src/parser/ast/lossless/parser.rs
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@ -1,290 +0,0 @@
use std::borrow::Borrow;
use rowan::{
Checkpoint, GreenNode, GreenNodeBuilder, GreenNodeData, GreenTokenData, Language, NodeOrToken,
};
use crate::parser::{
ast::lossless::{lex::SyntaxKind::*, Lang},
Span,
};
use self::parser_to_events::{to_events, Event};
use super::lex::{self, SyntaxKind};
pub mod parser_to_events {
use chumsky::prelude::*;
use crate::parser::ast::lossless::lex::{
self,
SyntaxKind::{self, *},
};
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum Event {
StartNode(SyntaxKind),
StartErr(SyntaxError),
EatToken,
FinishNode,
FinishErr,
}
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum SyntaxError {
Expected(SyntaxKind),
AttrExpectedValue,
/// guessed if there's a newline and attr on next line without comma
/// should then suggest comma after attr
ExpectedCommaBetweenAttrs,
}
pub fn to_events(tokens: &[(SyntaxKind, &str)]) -> Vec<Event> {
let only_toks: Vec<SyntaxKind> = tokens.iter().map(|(t, _)| *t).collect();
let res = parser().parse(&only_toks);
res.unwrap()
}
macro_rules! padded {
($parser:expr) => {{
let ws = one_of([WHITESPACE, NEWLINE])
.to(Event::EatToken)
.repeated()
.collect::<Vec<Event>>();
ws.then($parser)
.then(ws)
.map(|((mut before, mut c), mut after)| {
before.append(&mut c);
before.append(&mut after);
before
})
}};
}
macro_rules! parenthesized {
($parser:expr) => {
just(L_PAREN)
.to(vec![Event::EatToken])
.then($parser)
.then(just(R_PAREN).to(vec![Event::EatToken]))
.map(|((mut before, mut c), mut after)| {
before.insert(0, Event::StartNode(PARENTHESIZED_EXPR));
before.append(&mut c);
before.append(&mut after);
before.push(Event::FinishNode);
before
})
};
}
pub fn parser<'toks>() -> impl Parser<'toks, &'toks [SyntaxKind], Vec<Event>> {
let ws = one_of([WHITESPACE, NEWLINE])
.to(Event::EatToken)
.repeated()
.collect::<Vec<Event>>();
let ident = just(IDENT).to(vec![Event::EatToken]);
let expr = recursive(|expr| {
let lit = one_of([INT_NUM, FLOAT_NUM, STRING]).to(vec![
Event::StartNode(EXPR),
Event::EatToken,
Event::FinishNode,
]);
let attrset = just(L_CURLY)
.then(
padded!(just(IDENT).to(vec![
Event::StartNode(ATTR),
Event::StartNode(ATTR_NAME),
Event::EatToken,
Event::FinishNode
]))
.then(just(COLON))
.then(padded!(expr.clone().map(|mut exp: Vec<Event>| {
exp.insert(0, Event::StartNode(ATTR_VALUE));
exp.push(Event::FinishNode);
exp.push(Event::FinishNode);
exp
})))
.map(|((mut name, _), mut value)| {
// colon
name.push(Event::EatToken);
name.append(&mut value);
name
}),
)
.then(just(R_CURLY))
.map(|((_, mut attrs), _)| {
attrs.insert(0, Event::StartNode(ATTR_SET));
attrs.insert(0, Event::EatToken);
attrs.push(Event::EatToken);
attrs.push(Event::FinishNode);
attrs
});
let atom = lit.clone().or(attrset).or(parenthesized!(expr));
let instr_name = ident
.clone()
.map(|mut v| {
v.insert(0, Event::StartNode(INSTR_NAME));
v
})
.foldl(
ws.then(ident).repeated(),
|mut ident, (mut ws, mut next)| {
ident.append(&mut ws);
ident.append(&mut next);
ident
},
)
.map(|mut v| {
v.push(Event::FinishNode);
v
});
let instr = padded!(instr_name)
.then(
atom.clone()
.map(|mut v| {
v.insert(0, Event::StartNode(INSTR_PARAMS));
v
})
.foldl(
ws.then(atom.clone()).repeated(),
|mut cur, (mut ws, mut next)| {
cur.append(&mut ws);
cur.append(&mut next);
cur
},
)
.map(|mut v| {
v.push(Event::FinishNode);
v
}),
)
.map(|(mut name, mut params)| {
name.insert(0, Event::StartNode(INSTR));
name.append(&mut params);
name.push(Event::FinishNode);
name
});
padded!(instr.or(lit).or(atom))
});
expr
// .map(|(lit, mut ev)| lit.append(&mut ev));
}
}
#[derive(PartialEq, Eq)]
pub struct Parse {
pub green_node: GreenNode,
}
impl std::fmt::Debug for Parse {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
debug_print_green_node(NodeOrToken::Node(self.green_node.borrow()), f, 0)
}
}
fn debug_print_green_node(
node: NodeOrToken<&GreenNodeData, &GreenTokenData>,
f: &mut std::fmt::Formatter<'_>,
lvl: i32,
) -> std::fmt::Result {
for _ in 0..lvl {
f.write_str(" ")?;
}
match node {
NodeOrToken::Node(n) => {
writeln!(f, "{:?} {{", Lang::kind_from_raw(node.kind()));
for c in n.children() {
debug_print_green_node(c, f, lvl + 1)?;
}
for _ in 0..lvl {
f.write_str(" ")?;
}
f.write_str("}\n")
}
NodeOrToken::Token(t) => {
writeln!(f, "{:?} {:?};", Lang::kind_from_raw(t.kind()), t.text())
}
}
}
#[derive(Debug)]
struct Parser<'src> {
tokens: Vec<(SyntaxKind, &'src str)>,
builder: GreenNodeBuilder<'src>,
errors: Vec<SyntaxError>,
}
#[derive(Debug, PartialEq, Eq)]
enum SyntaxError {
Expected(SyntaxKind),
AttrExpectedValue,
/// guessed if there's a newline and attr on next line without comma
/// should then suggest comma after attr
ExpectedCommaBetweenAttrs,
}
pub fn parse(src: &str) -> Parse {
let tokens = lex::lex(src);
Parser {
tokens,
builder: GreenNodeBuilder::new(),
errors: Vec::new(),
}
.parse()
}
impl Parser<'_> {
fn parse(mut self) -> Parse {
let evs = to_events(&self.tokens);
self.builder.start_node(ROOT.into());
println!("evs: {evs:?}");
self.tokens.reverse();
for ev in evs {
match ev {
Event::StartNode(kind) => self.builder.start_node(kind.into()),
Event::StartErr(SyntaxError) => todo!(),
Event::EatToken => self.bump(),
Event::FinishNode => self.builder.finish_node(),
Event::FinishErr => todo!(),
}
}
self.builder.finish_node();
Parse {
green_node: self.builder.finish(),
}
}
/// Advance one token, adding it to the current branch of the tree builder.
fn bump(&mut self) {
let (kind, text) = self.tokens.pop().unwrap();
self.builder.token(kind.into(), text);
}
fn syntax_err(&mut self, err: SyntaxError) {
let (_, text) = self.tokens.pop().unwrap();
self.builder.token(PARSE_ERR.into(), text);
self.errors.push(err);
}
fn syntax_err_by_checkpoint(&mut self, checkpoint: Checkpoint, err: SyntaxError) {
self.builder.start_node_at(checkpoint, PARSE_ERR.into());
self.builder.finish_node();
self.errors.push(err);
}
fn expected(&mut self, expected: SyntaxKind) {
self.syntax_err(SyntaxError::Expected(expected))
}
/// Peek at the first unprocessed token
fn current(&self) -> Option<SyntaxKind> {
self.tokens.last().map(|(kind, _)| *kind)
}
fn next(&self) -> Option<SyntaxKind> {
self.tokens
.get(self.tokens.len() - 2)
.map(|(kind, _)| *kind)
}
}

50
crates/lang/src/parser/ast/raw_ast.rs
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@ -1,50 +0,0 @@
use indexmap::IndexMap;
use super::super::Spanned;
use super::super::Span;
use super::Lit;
#[derive(Debug, PartialEq)]
pub struct RawExpression<'src> {
pub expr: Box<RawExpr<'src>>,
pub span: Span,
}
impl<'src> RawExpression<'src> {
pub fn new(expr: RawExpr<'src>, span: Span) -> Self {
Self {
expr: Box::new(expr),
span,
}
}
}
#[derive(Debug, PartialEq)]
pub enum RawExpr<'src> {
Node(
Vec<Spanned<&'src str>>,
Option<Spanned<IndexMap<Spanned<&'src str>, RawExpression<'src>>>>,
),
SimplePipe(RawExpression<'src>, RawExpression<'src>),
// NamingPipe(
// Box<Expression<'src>>,
// (Vec<Spanned<&'src str>>, Vec<Spanned<&'src str>>),
// Box<Expression<'src>>,
// ),
MappingPipe(RawExpression<'src>, RawExpression<'src>),
NullPipe(RawExpression<'src>, RawExpression<'src>),
MultiPipe(IndexMap<Spanned<&'src str>, RawExpression<'src>>),
// LetIn(
// IndexMap<Spanned<&'src str>, Box<Expression<'src>>>,
// Box<Expression<'src>>,
// ),
// $
Var(&'src str),
// @
InputVar(&'src str),
AttrSet(Spanned<IndexMap<Spanned<&'src str>, RawExpression<'src>>>),
Lit(Lit<'src>),
Matrix(Spanned<(u16, u16)>, Vec<RawExpression<'src>>),
List(Vec<RawExpression<'src>>),
}

6
crates/lang/src/parser/error.rs Normal file
View file

@ -0,0 +1,6 @@
use crate::parser::syntax_kind::SyntaxKind;
#[derive(Debug)]
pub enum SyntaxError {
Expected(Vec<SyntaxKind>),
}

23
crates/lang/src/parser/events.rs Normal file
View file

@ -0,0 +1,23 @@
use crate::parser::syntax_kind::SyntaxKind;
#[derive(Debug)]
pub enum Event {
Start {
kind: SyntaxKind,
forward_parent: Option<usize>,
},
Finish,
Eat {
count: usize,
},
Error,
}
impl Event {
pub(crate) fn tombstone() -> Self {
Self::Start {
kind: SyntaxKind::TOMBSTONE,
forward_parent: None,
}
}
}

14
crates/lang/src/parser/grammar.rs Normal file
View file

@ -0,0 +1,14 @@
use crate::parser::syntax_kind::SyntaxKind::*;
use super::Parser;
mod expression;
pub fn source_file(p: &mut Parser) {
let root = p.start();
expression::expression(p);
p.eat_succeeding_ws();
root.complete(p, ROOT);
}

14
crates/lang/src/parser/grammar/expression.rs Normal file
View file

@ -0,0 +1,14 @@
use crate::parser::{syntax_kind::SyntaxKind::*, Parser};
use self::{instruction::instr, lit::literal};
mod instruction;
mod lit;
pub fn expression(p: &mut Parser) {
let expr = p.start();
instr(p);
expr.complete(p, EXPR);
}

30
crates/lang/src/parser/grammar/expression/instruction.rs Normal file
View file

@ -0,0 +1,30 @@
use crate::parser::{syntax_kind::SyntaxKind::*, Parser};
use super::lit::literal;
pub fn instr(p: &mut Parser) {
let instr = p.start();
instr_name(p);
instr_params(p);
instr.complete(p, INSTR);
}
fn instr_name(p: &mut Parser) {
let instr_name = p.start();
while p.at(IDENT) {
p.do_bump();
}
instr_name.complete(p, INSTR_NAME);
}
fn instr_params(p: &mut Parser) {
if let Some(start) = literal(p) {
while literal(p).is_some() {}
start.precede(p).complete(p, INSTR_PARAMS);
}
}

20
crates/lang/src/parser/grammar/expression/lit.rs Normal file
View file

@ -0,0 +1,20 @@
use enumset::enum_set;
use crate::parser::{
syntax_kind::{SyntaxKind::*, TokenSet},
CompletedMarker, Parser,
};
const LIT_TOKENS: TokenSet = enum_set!(INT_NUM | FLOAT_NUM | STRING);
pub fn literal(p: &mut Parser) -> Option<CompletedMarker> {
if !LIT_TOKENS.contains(p.current()) {
return None;
}
let lit = p.start();
p.do_bump();
Some(lit.complete(p, LITERAL))
}

61
crates/lang/src/parser/input.rs Normal file
View file

@ -0,0 +1,61 @@
use crate::parser::syntax_kind::SyntaxKind;
pub struct Input<'src, 'toks> {
raw: &'toks Vec<(SyntaxKind, &'src str)>,
/// indices of the "meaningful" tokens (not whitespace etc)
/// includes newlines because those might indeed help with finding errors
meaningful: Vec<usize>,
/// indices of newlines for the purpose of easily querying them
/// can be helpful with missing commas etc
newlines: Vec<usize>,
}
impl<'src, 'toks> Input<'src, 'toks> {
pub fn new(raw_toks: &'toks Vec<(SyntaxKind, &'src str)>) -> Self {
let meaningful = raw_toks
.iter()
.enumerate()
.filter_map(|(i, tok)| match tok.0 {
SyntaxKind::WHITESPACE | SyntaxKind::NEWLINE => None,
_ => Some(i),
})
.collect();
let newlines = raw_toks
.iter()
.enumerate()
.filter_map(|(i, tok)| match tok.0 {
SyntaxKind::NEWLINE => Some(i),
_ => None,
})
.collect();
Self {
raw: raw_toks,
meaningful,
newlines,
}
}
#[allow(clippy::unwrap_used, reason = "meaningful indices cannot be invalid")]
pub(crate) fn kind(&self, idx: usize) -> SyntaxKind {
let Some(meaningful_idx) = self.meaningful.get(idx) else {
return SyntaxKind::EOF;
};
self.raw.get(*meaningful_idx).unwrap().0
}
pub(crate) fn preceding_meaningless(&self, idx: usize) -> usize {
assert!(self.meaningful.len() > idx);
if idx == 0 {
1
} else {
self.meaningful[idx] - self.meaningful[idx - 1]
}
}
pub(crate) fn meaningless_tail_len(&self) -> usize {
self.raw.len() - (self.meaningful.last().unwrap() + 1)
}
}

113
crates/lang/src/parser/output.rs Normal file
View file

@ -0,0 +1,113 @@
use rowan::{GreenNode, GreenNodeBuilder, GreenNodeData, GreenTokenData, Language, NodeOrToken};
use std::mem;
use crate::parser::syntax_kind::{Lang, SyntaxKind};
use super::{error::SyntaxError, events::Event};
pub struct Output {
pub green_node: GreenNode,
pub errors: Vec<SyntaxError>,
}
impl std::fmt::Debug for Output {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
debug_print_green_node(NodeOrToken::Node(&self.green_node), f, 0)
}
}
fn debug_print_green_node(
node: NodeOrToken<&GreenNodeData, &GreenTokenData>,
f: &mut std::fmt::Formatter<'_>,
lvl: i32,
) -> std::fmt::Result {
for _ in 0..lvl {
f.write_str(" ")?;
}
match node {
NodeOrToken::Node(n) => {
writeln!(f, "{:?} {{", Lang::kind_from_raw(node.kind()))?;
for c in n.children() {
debug_print_green_node(c, f, lvl + 1)?;
}
for _ in 0..lvl {
f.write_str(" ")?;
}
f.write_str("}\n")
}
NodeOrToken::Token(t) => {
writeln!(f, "{:?} {:?};", Lang::kind_from_raw(t.kind()), t.text())
}
}
}
impl Output {
pub fn from_parser_output(
mut raw_toks: Vec<(SyntaxKind, &str)>,
(mut events, errs): (Vec<Event>, Vec<SyntaxError>),
) -> Self {
let mut builder = GreenNodeBuilder::new();
let mut fw_parents = Vec::new();
raw_toks.reverse();
for i in 0..events.len() {
match mem::replace(&mut events[i], Event::tombstone()) {
Event::Start {
kind,
forward_parent,
} => {
if kind == SyntaxKind::TOMBSTONE && forward_parent.is_none() {
continue;
}
fw_parents.push(kind);
let mut idx = i;
let mut fp = forward_parent;
while let Some(fwd) = fp {
idx += fwd as usize;
fp = match mem::replace(&mut events[idx], Event::tombstone()) {
Event::Start {
kind,
forward_parent,
} => {
fw_parents.push(kind);
forward_parent
}
_ => unreachable!(),
}
}
// remove whitespace bc it's ugly
while let Some((SyntaxKind::WHITESPACE | SyntaxKind::NEWLINE, _)) =
raw_toks.last()
{
match events.iter_mut().find(|ev| matches!(ev, Event::Eat { .. })) {
Some(Event::Eat { count }) => *count -= 1,
_ => unreachable!(),
}
let (tok, text): (SyntaxKind, &str) = raw_toks.pop().unwrap();
builder.token(tok.into(), text);
}
for kind in fw_parents.drain(..).rev() {
if kind != SyntaxKind::TOMBSTONE {
builder.start_node(kind.into());
}
}
}
Event::Finish => builder.finish_node(),
Event::Eat { count } => (0..count).for_each(|_| {
let (tok, text): (SyntaxKind, &str) = raw_toks.pop().unwrap();
builder.token(tok.into(), text);
}),
Event::Error => todo!(),
}
}
Self {
green_node: builder.finish(),
errors: errs,
}
}
}

6
crates/lang/src/parser/parser.rs Normal file
View file

@ -0,0 +1,6 @@
//! The parser architecture is *heavily* inspired (and partially copied and adapted) from the amazing rust-analyzer
use drop_bomb::DropBomb;
use self::{error::SyntaxError, events::Event, input::Input};
use super::syntax_kind::SyntaxKind;

27
crates/lang/src/parser/ast/lossless/lex.rs → crates/lang/src/parser/syntax_kind.rs
View file

@ -1,7 +1,6 @@
use enumset::EnumSet;
use logos::Logos;
use crate::parser::Span;
pub fn lex(src: &str) -> Vec<(SyntaxKind, &str)> {
let mut lex = SyntaxKind::lexer(src);
let mut r = Vec::new();
@ -13,8 +12,9 @@ pub fn lex(src: &str) -> Vec<(SyntaxKind, &str)> {
r
}
#[derive(Logos, Debug, PartialEq, Eq, Clone, Copy, Hash, PartialOrd, Ord)]
#[derive(enumset::EnumSetType, Logos, Debug, PartialEq, Eq, Clone, Copy, Hash, PartialOrd, Ord)]
#[repr(u16)]
#[enumset(no_super_impls)]
#[allow(non_camel_case_types)]
pub enum SyntaxKind {
#[token("def")]
@ -39,6 +39,7 @@ pub enum SyntaxKind {
MAT_BODY,
PARENTHESIZED_EXPR,
EXPR,
LITERAL,
#[token("(")]
L_PAREN,
#[token(")")]
@ -109,9 +110,29 @@ pub enum SyntaxKind {
PARSE_ERR,
LEX_ERR,
ROOT,
EOF,
TOMBSTONE,
ERROR,
}
pub type TokenSet = EnumSet<SyntaxKind>;
impl From<SyntaxKind> for rowan::SyntaxKind {
fn from(kind: SyntaxKind) -> Self {
Self(kind as u16)
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub enum Lang {}
impl rowan::Language for Lang {
type Kind = SyntaxKind;
#[allow(unsafe_code)]
fn kind_from_raw(raw: rowan::SyntaxKind) -> Self::Kind {
assert!(raw.0 <= SyntaxKind::ROOT as u16);
unsafe { std::mem::transmute::<u16, SyntaxKind>(raw.0) }
}
fn kind_to_raw(kind: Self::Kind) -> rowan::SyntaxKind {
kind.into()
}
}

142
crates/lang/src/parser/tests.rs
View file

@ -1,143 +1 @@
use crate::parser::ast::File;
use crate::parser::parse;
use crate::tokens::Token;
use chumsky::input::Stream;
use chumsky::prelude::*;
use indexmap::IndexMap;
use logos::Logos;
// #[test]
// fn test_parse_node_with_params() {
// const INPUT: &str = "meow [ hello: $foo, world: @bar]";
// assert_eq!(
// parse(INPUT).unwrap(),
// File {
// decls: IndexMap::from_iter([(
// ("main", (0..0).into()),
// (
// Expr::Node(
// ("meow", (0..4).into()),
// Some((
// IndexMap::from_iter([
// (
// ("hello", (7..12).into()),
// Expr::Var(("foo", (14..18).into()))
// ),
// (
// ("world", (20..25).into()),
// Expr::InputVar(("bar", (27..31).into()))
// )
// ]),
// (5..32).into()
// ))
// ),
// (0..32).into()
// )
// )])
// }
// );
// }
// fn test_parse_multiple_top_level_complex() {
// const INPUT: &str = r"def main = meow
// | uwu
// [ foo: @bar
// , hello: world @| test [ more: params ] | yay
// ]
// !| awa
// @| nya
// | rawr;
// def test = meow
// [ hello: $foo
// , world: @bar
// ];
// ";
// assert_eq!(
// parse(INPUT).unwrap(),
// File {
// decls: IndexMap::from_iter([
// (
// ("main", (4..8).into()),
// (
// Expr::SimplePipe(
// Box::new(Expr::Node(("meow", (11..15).into()), None)),
// Box::new(Expr::NullPipe(
// Box::new(Expr::Node(
// ("uwu", (20..23).into()),
// Some((
// IndexMap::from_iter([
// (
// ("foo", (29..32).into()),
// Expr::InputVar(("bar", (34..38).into()))
// ),
// (
// ("hello", (44..49).into()),
// Expr::MappingPipe(
// Box::new(Expr::Node(
// ("world", (51..56).into()),
// None
// )),
// Box::new(Expr::SimplePipe(
// Box::new(Expr::Node(
// ("test", (60..64).into()),
// Some((
// IndexMap::from_iter([(
// ("more", (67..71).into()),
// Expr::Node(
// ("params", (73..79).into()),
// None
// )
// )]),
// (65..81).into()
// ))
// )),
// Box::new(Expr::Node(
// ("yay", (84..87).into()),
// None
// ))
// ))
// )
// )
// ]),
// (27..92).into()
// ))
// )),
// Box::new(Expr::MappingPipe(
// Box::new(Expr::Node(("awa", (97..100).into()), None)),
// Box::new(Expr::SimplePipe(
// Box::new(Expr::Node(("nya", (106..109).into()), None)),
// Box::new(Expr::Node(("rawr", (114..118).into()), None))
// ))
// ))
// ))
// ),
// (11..118).into()
// ),
// ),
// (
// ("test", (125..129).into()),
// (
// Expr::Node(
// ("meow", (132..136).into()),
// Some((
// IndexMap::from_iter([
// (
// ("hello", (141..146).into()),
// Expr::Var(("foo", (148..152).into()))
// ),
// (
// ("world", (156..161).into()),
// Expr::InputVar(("bar", (163..167).into()))
// )
// ]),
// (139..171).into()
// ))
// ),
// (132..171).into()
// )
// )
// ])
// }
// );
// }