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use std::sync::Arc;
use {
SyntaxKind::{self, *},
TextUnit,
};
#[derive(Clone, Debug)]
pub(crate) enum GreenNode {
Leaf(GreenLeaf),
Branch(Arc<GreenBranch>),
}
impl GreenNode {
pub fn kind(&self) -> SyntaxKind {
match self {
GreenNode::Leaf(l) => l.kind(),
GreenNode::Branch(b) => b.kind(),
}
}
pub fn text_len(&self) -> TextUnit {
match self {
GreenNode::Leaf(l) => l.text_len(),
GreenNode::Branch(b) => b.text_len(),
}
}
pub fn children(&self) -> &[GreenNode] {
match self {
GreenNode::Leaf(_) => &[],
GreenNode::Branch(b) => b.children(),
}
}
pub fn text(&self) -> String {
let mut buff = String::new();
go(self, &mut buff);
return buff;
fn go(node: &GreenNode, buff: &mut String) {
match node {
GreenNode::Leaf(l) => buff.push_str(&l.text()),
GreenNode::Branch(b) => b.children().iter().for_each(|child| go(child, buff)),
}
}
}
}
pub(crate) struct GreenNodeBuilder {
kind: SyntaxKind,
children: Vec<GreenNode>,
}
impl GreenNodeBuilder {
pub(crate) fn new_leaf(kind: SyntaxKind, text: &str) -> GreenNode {
GreenNode::Leaf(GreenLeaf::new(kind, text))
}
pub(crate) fn new_internal(kind: SyntaxKind) -> GreenNodeBuilder {
GreenNodeBuilder {
kind,
children: Vec::new(),
}
}
pub(crate) fn push_child(&mut self, node: GreenNode) {
self.children.push(node)
}
pub(crate) fn build(self) -> GreenNode {
let branch = GreenBranch::new(self.kind, self.children);
GreenNode::Branch(Arc::new(branch))
}
}
#[test]
fn assert_send_sync() {
fn f<T: Send + Sync>() {}
f::<GreenNode>();
}
#[derive(Clone, Debug)]
pub(crate) enum GreenLeaf {
Whitespace { newlines: u8, spaces: u8 },
Token { kind: SyntaxKind, text: Arc<str> },
}
impl GreenLeaf {
fn new(kind: SyntaxKind, text: &str) -> Self {
if kind == WHITESPACE {
let newlines = text.bytes().take_while(|&b| b == b'\n').count();
let spaces = text[newlines..].bytes().take_while(|&b| b == b' ').count();
if newlines + spaces == text.len() && newlines <= N_NEWLINES && spaces <= N_SPACES {
return GreenLeaf::Whitespace {
newlines: newlines as u8,
spaces: spaces as u8,
};
}
}
GreenLeaf::Token {
kind,
text: text.to_owned().into_boxed_str().into(),
}
}
pub(crate) fn kind(&self) -> SyntaxKind {
match self {
GreenLeaf::Whitespace { .. } => WHITESPACE,
GreenLeaf::Token { kind, .. } => *kind,
}
}
pub(crate) fn text(&self) -> &str {
match self {
&GreenLeaf::Whitespace { newlines, spaces } => {
let newlines = newlines as usize;
let spaces = spaces as usize;
assert!(newlines <= N_NEWLINES && spaces <= N_SPACES);
&WS[N_NEWLINES - newlines..N_NEWLINES + spaces]
}
GreenLeaf::Token { text, .. } => text,
}
}
pub(crate) fn text_len(&self) -> TextUnit {
TextUnit::of_str(self.text())
}
}
const N_NEWLINES: usize = 16;
const N_SPACES: usize = 64;
const WS: &str =
"\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n ";
#[derive(Clone, Debug)]
pub(crate) struct GreenBranch {
text_len: TextUnit,
kind: SyntaxKind,
children: Vec<GreenNode>,
}
impl GreenBranch {
fn new(kind: SyntaxKind, children: Vec<GreenNode>) -> GreenBranch {
let text_len = children.iter().map(|x| x.text_len()).sum::<TextUnit>();
GreenBranch {
text_len,
kind,
children,
}
}
pub fn kind(&self) -> SyntaxKind {
self.kind
}
pub fn text_len(&self) -> TextUnit {
self.text_len
}
pub fn children(&self) -> &[GreenNode] {
self.children.as_slice()
}
}
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