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use text::{TextUnit, TextRange};
use syntax_kinds::syntax_info;
use std::fmt;
use std::cmp;
mod file_builder;
pub use self::file_builder::{FileBuilder, Sink};
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct SyntaxKind(pub(crate) u32);
pub(crate) const EOF: SyntaxKind = SyntaxKind(!0);
pub(crate) const EOF_INFO: SyntaxInfo = SyntaxInfo {
name: "EOF"
};
pub(crate) const TOMBSTONE: SyntaxKind = SyntaxKind(!0 - 1);
pub(crate) const TOMBSTONE_INFO: SyntaxInfo = SyntaxInfo {
name: "TOMBSTONE"
};
impl SyntaxKind {
fn info(self) -> &'static SyntaxInfo {
match self {
EOF => &EOF_INFO,
TOMBSTONE => &TOMBSTONE_INFO,
_ => syntax_info(self),
}
}
}
impl fmt::Debug for SyntaxKind {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let name = self.info().name;
f.write_str(name)
}
}
pub(crate) struct SyntaxInfo {
pub name: &'static str,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct Token {
pub kind: SyntaxKind,
pub len: TextUnit,
}
pub struct File {
text: String,
nodes: Vec<NodeData>,
errors: Vec<SyntaxErrorData>,
}
impl File {
pub fn root<'f>(&'f self) -> Node<'f> {
assert!(!self.nodes.is_empty());
Node { file: self, idx: NodeIdx(0) }
}
}
#[derive(Clone, Copy)]
pub struct Node<'f> {
file: &'f File,
idx: NodeIdx,
}
impl<'f> Node<'f> {
pub fn kind(&self) -> SyntaxKind {
self.data().kind
}
pub fn range(&self) -> TextRange {
self.data().range
}
pub fn text(&self) -> &'f str {
&self.file.text.as_str()[self.range()]
}
pub fn parent(&self) -> Option<Node<'f>> {
self.as_node(self.data().parent)
}
pub fn children(&self) -> Children<'f> {
Children { next: self.as_node(self.data().first_child) }
}
pub fn errors(&self) -> SyntaxErrors<'f> {
let pos = self.file.errors.iter().position(|e| e.node == self.idx);
let next = pos
.map(|i| ErrorIdx(i as u32))
.map(|idx| SyntaxError { file: self.file, idx });
SyntaxErrors { next }
}
fn data(&self) -> &'f NodeData {
&self.file.nodes[self.idx]
}
fn as_node(&self, idx: Option<NodeIdx>) -> Option<Node<'f>> {
idx.map(|idx| Node { file: self.file, idx })
}
}
impl<'f> fmt::Debug for Node<'f> {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
write!(fmt, "{:?}@{:?}", self.kind(), self.range())
}
}
impl<'f> cmp::PartialEq<Node<'f>> for Node<'f> {
fn eq(&self, other: &Node<'f>) -> bool {
self.idx == other.idx && ::std::ptr::eq(self.file, other.file)
}
}
impl<'f> cmp::Eq for Node<'f> {
}
#[derive(Clone, Copy)]
pub struct SyntaxError<'f> {
file: &'f File,
idx: ErrorIdx,
}
impl<'f> SyntaxError<'f> {
pub fn message(&self) -> &'f str {
self.data().message.as_str()
}
pub fn after_child(&self) -> Option<Node<'f>> {
let idx = self.data().after_child?;
Some(Node { file: self.file, idx })
}
fn data(&self) -> &'f SyntaxErrorData {
&self.file.errors[self.idx]
}
fn next(&self) -> Option<SyntaxError<'f>> {
let next_idx = self.idx.0 + 1;
if !((next_idx as usize) < self.file.errors.len()) {
return None;
}
let result = SyntaxError {
file: self.file,
idx: ErrorIdx(next_idx)
};
if result.data().node != self.data().node {
return None;
}
Some(result)
}
}
pub struct Children<'f> {
next: Option<Node<'f>>,
}
impl<'f> Iterator for Children<'f> {
type Item = Node<'f>;
fn next(&mut self) -> Option<Node<'f>> {
let next = self.next;
self.next = next.and_then(|node| node.as_node(node.data().next_sibling));
next
}
}
pub struct SyntaxErrors<'f> {
next: Option<SyntaxError<'f>>,
}
impl<'f> Iterator for SyntaxErrors<'f> {
type Item = SyntaxError<'f>;
fn next(&mut self) -> Option<SyntaxError<'f>> {
let next = self.next;
self.next = next.as_ref().and_then(SyntaxError::next);
next
}
}
#[derive(Clone, Copy, PartialEq, Eq)]
struct NodeIdx(u32);
struct NodeData {
kind: SyntaxKind,
range: TextRange,
parent: Option<NodeIdx>,
first_child: Option<NodeIdx>,
next_sibling: Option<NodeIdx>,
}
impl ::std::ops::Index<NodeIdx> for Vec<NodeData> {
type Output = NodeData;
fn index(&self, NodeIdx(idx): NodeIdx) -> &NodeData {
&self[idx as usize]
}
}
impl ::std::ops::IndexMut<NodeIdx> for Vec<NodeData> {
fn index_mut(&mut self, NodeIdx(idx): NodeIdx) -> &mut NodeData {
&mut self[idx as usize]
}
}
#[derive(Clone, Copy)]
struct ErrorIdx(u32);
struct SyntaxErrorData {
node: NodeIdx,
message: String,
after_child: Option<NodeIdx>,
}
impl ::std::ops::Index<ErrorIdx> for Vec<SyntaxErrorData> {
type Output = SyntaxErrorData;
fn index(&self, ErrorIdx(idx): ErrorIdx) -> &SyntaxErrorData {
&self[idx as usize]
}
}
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