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use itertools::Itertools;
use rnix::{match_ast, ast};
use rowan::ast::AstNode;
use crate::queries::*;
use crate::queries::SyntaxKind::*;
#[derive(Debug)]
pub struct Change {
pub node: rnix::SyntaxNode,
pub kind: ChangeKind
}
#[derive(Copy, Clone, Debug)]
pub enum ChangeKind {
Remove,
Keep
}
type NixExprs = Box<dyn Iterator<Item = rnix::SyntaxNode>>;
type Pipe = (Vec<Change>, NixExprs);
macro_rules! ast_node {
($ast:ident, $kind:ident) => {
#[derive(PartialEq, Eq, Hash)]
#[repr(transparent)]
struct $ast(SyntaxNode);
impl $ast {
#[allow(unused)]
fn cast(node: SyntaxNode) -> Option<Self> {
if node.kind() == $kind {
Some(Self(node))
} else {
None
}
}
}
};
}
ast_node!(Root, ROOT);
ast_node!(Atom, ATOM);
ast_node!(List, LIST);
#[derive(PartialEq, Eq, Hash, Debug)]
#[repr(transparent)]
struct Qexp(SyntaxNode);
enum QexpKind {
Atom(Atom),
List(List),
}
impl Qexp {
fn cast(node: SyntaxNode) -> Option<Self> {
if Atom::cast(node.clone()).is_some() || List::cast(node.clone()).is_some() {
Some(Qexp(node))
} else {
None
}
}
fn kind(&self) -> QexpKind {
Atom::cast(self.0.clone())
.map(QexpKind::Atom)
.or_else(|| List::cast(self.0.clone()).map(QexpKind::List))
.unwrap()
}
fn apply(&self, _acc: Pipe) -> Pipe {
todo!()
}
}
impl Root {
fn qexps(&self) -> impl Iterator<Item = Qexp> + '_ {
self.0.children().filter_map(Qexp::cast)
}
}
// address nodes by their role relative to their parent
enum NixSyntaxRole {
Argument,
Function,
Attribute,
// TODO
}
impl NixSyntaxRole {
fn from_str(from: &str) -> Option<NixSyntaxRole> {
use NixSyntaxRole::*;
Some(match from {
"Argument" => Argument,
"Function" => Function,
"Attribute" => Attribute,
_ => return None
})
}
}
enum Op {
Down,
DownRecursive,
Up,
UpRecursive,
NixSyntaxNode(rnix::SyntaxKind),
NixSyntaxRole(NixSyntaxRole),
Named(String)
}
impl Atom {
fn eval(&self) -> Option<i64> {
self.text().parse().ok()
}
fn as_op(&self) -> Option<Op> {
let op = match self.text().as_str() {
">" => Op::Down,
">>" => Op::DownRecursive,
"<" => Op::Up,
"<<" => Op::UpRecursive,
"Inherit" => Op::NixSyntaxNode(rnix::SyntaxKind::NODE_INHERIT),
"String" => Op::NixSyntaxNode(rnix::SyntaxKind::NODE_STRING),
// TODO other syntax nodes
name => if let Some(role) = NixSyntaxRole::from_str(name) {
Op::NixSyntaxRole(role)
} else {
Op::Named(name.to_owned())
},
};
Some(op)
}
fn as_change(&self) -> Option<ChangeKind> {
let change = match self.text().as_str() {
"remove" => ChangeKind::Remove,
"keep" => ChangeKind::Keep,
_ => return None
};
Some(change)
}
fn iter_args(&self) -> impl Iterator<Item = Atom> {
self.0.children().find_map(List::cast).into_iter().map(|arglist| arglist.iter()).flatten()
}
fn text(&self) -> String {
match self.0.green().children().next() {
Some(rowan::NodeOrToken::Token(token)) => token.text().to_string(),
_ => unreachable!(),
}
}
fn apply(&self, (mut changes, acc): Pipe) -> Pipe {
let mut acc: NixExprs = match self.as_op() {
Some(Op::Down) => Box::new(acc.map(|s| s.children()).flatten()),
Some(Op::DownRecursive) => Box::new(acc.map(|s| s.descendants()).flatten()),
Some(Op::Up) => Box::new(acc.filter_map(|s| s.parent())),
Some(Op::UpRecursive) => Box::new(acc.map(|s| s.ancestors()).flatten()),
// TODO: how to select roles relative to previous node?
Some(Op::NixSyntaxNode(kind)) => Box::new(acc.filter(move |s| s.kind() == kind)),
Some(Op::NixSyntaxRole(role)) => {use NixSyntaxRole::*; match role {
Argument => Box::new(acc.filter_map(move |s| match_ast! { match s {
ast::Apply(value) => value.argument().map(|s| s.syntax().to_owned()),
_ => None
}})),
_ => todo!()
}}
Some(Op::Named(name)) =>
Box::new(acc
.filter(move |node| match_ast! { match node {
ast::AttrpathValue(value) => {
name == value.attrpath().unwrap().to_string()
},
ast::Apply(value) => {
// TODO: special case lambda = NODE_SELECT here?
name == value.lambda().unwrap().to_string()
},
// TODO: this is difficult — I want to use free-form names
// to select things below, too, but that might not always be
// possible. perhaps it is possible to skip over descendants?
ast::Ident(value) => {
name == value.to_string()
},
_ => false
}})),
_ => todo!()
};
if let Ok(arg) = self.iter_args().exactly_one() {
if let Some(change) = arg.as_change() {
let (mut nchanges, nacc): (Vec<_>, Vec<_>) = acc
.map(|node| (Change { node: node.clone(), kind: change }, node))
.unzip();
acc = Box::new(nacc.into_iter());
changes.append(&mut nchanges);
}
}
(changes, acc)
}
}
impl List {
fn sexps(&self) -> impl Iterator<Item = Qexp> + '_ {
self.0.children().filter_map(Qexp::cast)
}
fn iter(&self) -> impl Iterator<Item = Atom> {
self.0.children().filter_map(Atom::cast)
}
}
impl Parse {
fn root(&self) -> Root {
Root::cast(self.syntax()).unwrap()
}
pub fn apply(&self, _content: &str, nexp: rnix::SyntaxNode) -> anyhow::Result<(Vec<Change>, Vec<rnix::SyntaxNode>)> {
let mut pipe: Pipe = (Vec::new(), Box::new(std::iter::once(nexp)));
for qexp in self.root().qexps() {
match qexp.kind() {
QexpKind::Atom(filter) => {
pipe = filter.apply(pipe);
}
_ => panic!("???")
}
}
// let results =
// acc.map(|node| content[node.text_range().start().into()..node.text_range().end().into()].to_owned())
// .collect();
Ok((pipe.0, pipe.1.collect()))
}
}
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