feat: add asynchronous LSP plugin diagnostics and definitions

src/plugin.rs

@@ -0,0 +1,88 @@
+use std::path::PathBuf;
+
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, Serialize)]
+pub struct DocumentSnapshot {
+    pub id: usize,
+    pub revision: u64,
+    pub path: Option<String>,
+    pub root: String,
+    pub text: String,
+}
+
+#[derive(Clone, Copy, Debug, Serialize)]
+#[serde(rename_all = "snake_case")]
+pub enum DocumentEventKind {
+    Open,
+    Change,
+    Save,
+    Close,
+}
+
+#[derive(Clone, Debug, Serialize)]
+pub struct DocumentEvent {
+    pub event: DocumentEventKind,
+    pub document: DocumentSnapshot,
+}
+
+#[derive(Clone, Copy, Debug, Deserialize, Eq, PartialEq)]
+#[serde(rename_all = "snake_case")]
+pub enum DiagnosticSeverity {
+    Error,
+    Warning,
+    Information,
+    Hint,
+}
+
+/// Zero-based extended-grapheme positions, independent of any server encoding.
+#[derive(Clone, Copy, Debug, Deserialize, Eq, Ord, PartialEq, PartialOrd)]
+#[serde(deny_unknown_fields)]
+pub struct TextPosition {
+    pub row: usize,
+    pub column: usize,
+}
+
+#[derive(Clone, Debug, Deserialize, Eq, PartialEq)]
+#[serde(deny_unknown_fields)]
+pub struct Diagnostic {
+    pub start: TextPosition,
+    pub end: TextPosition,
+    pub severity: DiagnosticSeverity,
+    pub message: String,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(tag = "type", rename_all = "snake_case", deny_unknown_fields)]
+pub enum UpdateEffect {
+    Diagnostics {
+        buffer_id: usize,
+        revision: u64,
+        items: Vec<Diagnostic>,
+    },
+    Navigate {
+        buffer_id: usize,
+        revision: u64,
+        path: PathBuf,
+        row: usize,
+        column: usize,
+    },
+    Message {
+        text: String,
+    },
+}
+
+#[derive(Debug)]
+pub struct PluginUpdate {
+    pub request_id: Option<u64>,
+    pub effects: Vec<UpdateEffect>,
+}
+
+#[derive(Debug)]
+pub enum PluginEvent {
+    Response {
+        id: u64,
+        effects: Vec<crate::editor::Effect>,
+    },
+    Update(PluginUpdate),
+}