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rust: Add Hash for Point, Range and Node

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This commit is contained in:
Max Brunsfeld 2020-02-13 16:03:02 -08:00
parent ca73cba5f0
commit 56e52c76f9
1 changed files with 23 additions and 3 deletions
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26
lib/binding_rust/lib.rs
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@ -15,7 +15,7 @@ use std::mem::MaybeUninit;
use std::os::raw::{c_char, c_void};
use std::ptr::NonNull;
use std::sync::atomic::AtomicUsize;
use std::{char, fmt, iter, ptr, slice, str, u16};
use std::{char, fmt, hash, iter, ptr, slice, str, u16};
/// The latest ABI version that is supported by the current version of the
/// library.
@ -44,7 +44,7 @@ pub struct Tree(NonNull<ffi::TSTree>);
/// A position in a multi-line text document, in terms of rows and columns.
///
/// Rows and columns are zero-based.
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, PartialOrd, Ord)]
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub struct Point {
pub row: usize,
pub column: usize,
@ -52,7 +52,7 @@ pub struct Point {
/// A range of positions in a multi-line text document, both in terms of bytes and of
/// rows and columns.
#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub struct Range {
pub start_byte: usize,
pub end_byte: usize,
@ -670,6 +670,16 @@ impl<'tree> Node<'tree> {
}
}
/// Get a numeric id for this node that is unique.
///
/// Within a given syntax tree, no two nodes have the same id. However, if
/// a new tree is created based on an older tree, and a node from the old
/// tree is reused in the process, then that node will have the same id in
/// both trees.
pub fn id(&self) -> usize {
self.0.id as usize
}
/// Get this node's type as a numerical id.
pub fn kind_id(&self) -> u16 {
unsafe { ffi::ts_node_symbol(self.0) }
@ -1003,6 +1013,16 @@ impl<'a> PartialEq for Node<'a> {
impl<'a> Eq for Node<'a> {}
impl<'a> hash::Hash for Node<'a> {
fn hash<H: hash::Hasher>(&self, state: &mut H) {
self.0.id.hash(state);
self.0.context[0].hash(state);
self.0.context[1].hash(state);
self.0.context[2].hash(state);
self.0.context[3].hash(state);
}
}
impl<'a> fmt::Debug for Node<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
write!(