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-rw-r--r--support/texlab/src/syntax/generic_ast.rs51
1 files changed, 51 insertions, 0 deletions
diff --git a/support/texlab/src/syntax/generic_ast.rs b/support/texlab/src/syntax/generic_ast.rs
new file mode 100644
index 0000000000..3311460c0a
--- /dev/null
+++ b/support/texlab/src/syntax/generic_ast.rs
@@ -0,0 +1,51 @@
+use serde::{Deserialize, Serialize};
+use std::ops::Index;
+
+#[derive(Debug, PartialEq, Eq, Clone, Copy, Serialize, Deserialize)]
+pub struct AstNodeIndex(usize);
+
+#[derive(Debug, PartialEq, Eq, Clone, Default)]
+pub struct Ast<T> {
+ nodes: Vec<T>,
+ edges: Vec<Vec<AstNodeIndex>>,
+}
+
+impl<T> Ast<T> {
+ pub fn new() -> Self {
+ Self {
+ nodes: Vec::new(),
+ edges: Vec::new(),
+ }
+ }
+
+ pub fn nodes(&self) -> Vec<AstNodeIndex> {
+ let mut nodes = Vec::new();
+ for i in 0..self.nodes.len() {
+ nodes.push(AstNodeIndex(i));
+ }
+ nodes
+ }
+
+ pub fn add_node(&mut self, value: T) -> AstNodeIndex {
+ let node = AstNodeIndex(self.nodes.len());
+ self.nodes.push(value);
+ self.edges.push(Vec::new());
+ node
+ }
+
+ pub fn add_edge(&mut self, parent: AstNodeIndex, child: AstNodeIndex) {
+ self.edges[parent.0].push(child);
+ }
+
+ pub fn children<'a>(&'a self, parent: AstNodeIndex) -> impl Iterator<Item = AstNodeIndex> + 'a {
+ self.edges[parent.0].iter().map(|child| *child)
+ }
+}
+
+impl<T> Index<AstNodeIndex> for Ast<T> {
+ type Output = T;
+
+ fn index(&self, index: AstNodeIndex) -> &Self::Output {
+ &self.nodes[index.0]
+ }
+}