use std::collections::HashMap;
use std::sync::Arc;
use dashmap::DashMap;
use regex::Regex;
use tokio::sync::Mutex;
use tower_lsp::jsonrpc::Result;
use tower_lsp::lsp_types::*;
use tower_lsp::{Client, LanguageServer, LspService, Server};
use super::coverage::{compute_coverage, CoverageResult, StepValidation};
use super::hover::build_hover_content;
use super::matcher::{classify_match, MatchResult};
use super::scanner::{
build_scopes, build_spec_lookup, build_url_pattern, find_url_at_position, scan_document,
scan_steps, SpecUrl, StepComment, UrlMatch,
};
use super::steps::{find_step, parse_steps, AlgorithmStep};
use crate::model::QueryResult;
const DEBOUNCE_DELAY_MS: u64 = 300;
#[derive(Clone)]
struct Versioned<T: Clone> {
version: i32,
data: T,
}
#[derive(Clone)]
struct InternalValidation {
step: StepComment,
result: MatchResult,
spec_text: String,
algo_name: String,
}
struct State {
client: Client,
fuzzy_threshold: Mutex<f64>,
url_pattern: Mutex<Option<Regex>>,
spec_lookup: Mutex<HashMap<String, String>>,
doc_urls: DashMap<String, Versioned<Vec<UrlMatch>>>,
query_cache: DashMap<String, QueryResult>,
algo_steps_cache: DashMap<String, Vec<AlgorithmStep>>,
doc_validations: DashMap<String, Versioned<Vec<InternalValidation>>>,
#[allow(clippy::type_complexity)]
doc_scopes: DashMap<String, Versioned<Vec<(UrlMatch, Vec<StepComment>)>>>,
doc_coverages: DashMap<String, Versioned<Vec<(UrlMatch, CoverageResult)>>>,
debounce_tokens: DashMap<String, tokio::sync::watch::Sender<()>>,
documents: DashMap<String, (i32, String)>,
}
impl State {
fn new(client: Client) -> Self {
Self {
client,
fuzzy_threshold: Mutex::new(0.85),
url_pattern: Mutex::new(None),
spec_lookup: Mutex::new(HashMap::new()),
doc_urls: DashMap::new(),
query_cache: DashMap::new(),
algo_steps_cache: DashMap::new(),
doc_validations: DashMap::new(),
doc_scopes: DashMap::new(),
doc_coverages: DashMap::new(),
debounce_tokens: DashMap::new(),
documents: DashMap::new(),
}
}
async fn ensure_pattern(&self) {
let mut pattern = self.url_pattern.lock().await;
if pattern.is_none() {
let spec_entries = crate::spec_urls();
let spec_urls: Vec<SpecUrl> = spec_entries
.iter()
.map(|e| SpecUrl {
spec: e.spec.clone(),
base_url: e.base_url.clone(),
})
.collect();
*pattern = Some(build_url_pattern(&spec_urls));
let mut lookup = self.spec_lookup.lock().await;
*lookup = build_spec_lookup(&spec_urls);
}
}
async fn scan_doc(&self, uri: &str, text: &str, version: i32) -> Vec<UrlMatch> {
self.ensure_pattern().await;
if let Some(cached) = self.doc_urls.get(uri) {
if cached.version == version {
return cached.data.clone();
}
}
let pattern = self.url_pattern.lock().await;
let lookup = self.spec_lookup.lock().await;
let matches = scan_document(text, pattern.as_ref().unwrap(), &lookup);
self.doc_urls.insert(
uri.to_string(),
Versioned {
version,
data: matches.clone(),
},
);
matches
}
fn query_spec_cached(&self, spec: &str, anchor: &str) -> Option<QueryResult> {
let key = format!("{spec}#{anchor}");
if let Some(cached) = self.query_cache.get(&key) {
return Some(cached.clone());
}
let result = tokio::task::block_in_place(|| {
tokio::runtime::Handle::current()
.block_on(crate::query_section(&key))
.ok()
})?;
self.query_cache.insert(key, result.clone());
Some(result)
}
fn get_algo_steps_cached(&self, anchor: &str, content: &str) -> Option<Vec<AlgorithmStep>> {
if let Some(cached) = self.algo_steps_cache.get(anchor) {
return Some(cached.clone());
}
let steps = parse_steps(content);
if steps.is_empty() {
return None;
}
self.algo_steps_cache
.insert(anchor.to_string(), steps.clone());
Some(steps)
}
async fn validate_doc(&self, uri: &str, text: &str, version: i32) -> Vec<InternalValidation> {
if let Some(cached) = self.doc_validations.get(uri) {
if cached.version == version {
return cached.data.clone();
}
}
let url_matches = self.scan_doc(uri, text, version).await;
let step_comments = scan_steps(text);
if url_matches.is_empty() || step_comments.is_empty() {
self.doc_validations.insert(
uri.to_string(),
Versioned {
version,
data: vec![],
},
);
self.doc_scopes.insert(
uri.to_string(),
Versioned {
version,
data: vec![],
},
);
return vec![];
}
let scopes = build_scopes(&url_matches, &step_comments);
self.doc_scopes.insert(
uri.to_string(),
Versioned {
version,
data: scopes.clone(),
},
);
let threshold = *self.fuzzy_threshold.lock().await;
let mut validations = Vec::new();
for (url_match, steps_in_scope) in &scopes {
if steps_in_scope.is_empty() {
continue;
}
let result = match self.query_spec_cached(&url_match.spec, &url_match.anchor) {
Some(r) => r,
None => continue,
};
let content = match &result.content {
Some(c) if !c.is_empty() => c.clone(),
_ => continue,
};
let algo_steps = match self.get_algo_steps_cached(&url_match.anchor, &content) {
Some(s) => s,
None => continue,
};
for sc in steps_in_scope {
let spec_step = find_step(&algo_steps, &sc.number);
let (match_result, spec_text) = if let Some(ss) = spec_step {
(
classify_match(&sc.text, &ss.text, threshold),
ss.text.clone(),
)
} else {
(MatchResult::NotFound, String::new())
};
validations.push(InternalValidation {
step: sc.clone(),
result: match_result,
spec_text,
algo_name: url_match.anchor.clone(),
});
}
}
self.doc_validations.insert(
uri.to_string(),
Versioned {
version,
data: validations.clone(),
},
);
validations
}
async fn coverage_doc(
&self,
uri: &str,
text: &str,
version: i32,
) -> Vec<(UrlMatch, CoverageResult)> {
if let Some(cached) = self.doc_coverages.get(uri) {
if cached.version == version {
return cached.data.clone();
}
}
let validations = self.validate_doc(uri, text, version).await;
if validations.is_empty() {
self.doc_coverages.insert(
uri.to_string(),
Versioned {
version,
data: vec![],
},
);
return vec![];
}
let scopes = match self.doc_scopes.get(uri) {
Some(s) if s.version == version => s.data.clone(),
_ => {
self.doc_coverages.insert(
uri.to_string(),
Versioned {
version,
data: vec![],
},
);
return vec![];
}
};
let mut results = Vec::new();
for (url_match, steps_in_scope) in &scopes {
if steps_in_scope.is_empty() {
continue;
}
let algo_steps = match self.algo_steps_cache.get(&url_match.anchor) {
Some(s) => s.clone(),
None => continue,
};
let scope_lines: std::collections::HashSet<usize> =
steps_in_scope.iter().map(|s| s.line).collect();
let scope_vals: Vec<StepValidation> = validations
.iter()
.filter(|v| scope_lines.contains(&v.step.line))
.map(|v| StepValidation {
step: v.step.clone(),
result: v.result,
})
.collect();
let cov = compute_coverage(&scope_vals, &algo_steps, &url_match.anchor);
results.push((url_match.clone(), cov));
}
self.doc_coverages.insert(
uri.to_string(),
Versioned {
version,
data: results.clone(),
},
);
results
}
async fn publish_diagnostics(&self, uri: &str, text: &str, version: i32) {
let validations = self.validate_doc(uri, text, version).await;
let diagnostics = build_diagnostics(uri, &validations);
self.client
.publish_diagnostics(
uri.parse()
.unwrap_or_else(|_| Url::parse("file:///").unwrap()),
diagnostics,
None,
)
.await;
}
}
fn build_diagnostics(uri: &str, validations: &[InternalValidation]) -> Vec<Diagnostic> {
let mut diagnostics = Vec::new();
for v in validations {
if matches!(v.result, MatchResult::Exact | MatchResult::Fuzzy) {
continue;
}
let step_label = step_label(&v.step.number);
let msg = if v.result == MatchResult::NotFound {
format!(
"Step {step_label}: not found in algorithm '{}'",
v.algo_name
)
} else {
format!("Step {step_label}: text differs from spec")
};
let end_line = v.step.end_line.unwrap_or(v.step.line);
let mut diag = Diagnostic {
range: Range {
start: Position {
line: v.step.line as u32,
character: v.step.col_start as u32,
},
end: Position {
line: end_line as u32,
character: v.step.col_end as u32,
},
},
severity: Some(DiagnosticSeverity::WARNING),
source: Some("webspec-lens".to_string()),
message: msg,
..Default::default()
};
if !v.spec_text.is_empty() {
diag.related_information = Some(vec![DiagnosticRelatedInformation {
location: Location {
uri: uri
.parse()
.unwrap_or_else(|_| Url::parse("file:///").unwrap()),
range: diag.range,
},
message: format!("Expected: {}", v.spec_text),
}]);
}
diagnostics.push(diag);
}
diagnostics
}
fn step_label(number: &[u32]) -> String {
number
.iter()
.map(|n| n.to_string())
.collect::<Vec<_>>()
.join(".")
}
pub struct Backend {
state: Arc<State>,
}
#[tower_lsp::async_trait]
impl LanguageServer for Backend {
async fn initialize(&self, params: InitializeParams) -> Result<InitializeResult> {
if let Some(opts) = params.initialization_options {
if let Some(threshold) = opts.get("fuzzyThreshold").and_then(|v| v.as_f64()) {
if (0.0..=1.0).contains(&threshold) {
*self.state.fuzzy_threshold.lock().await = threshold;
}
}
}
Ok(InitializeResult {
capabilities: ServerCapabilities {
text_document_sync: Some(TextDocumentSyncCapability::Kind(
TextDocumentSyncKind::FULL,
)),
hover_provider: Some(HoverProviderCapability::Simple(true)),
inlay_hint_provider: Some(OneOf::Left(true)),
code_lens_provider: Some(CodeLensOptions {
resolve_provider: Some(false),
}),
..Default::default()
},
..Default::default()
})
}
async fn initialized(&self, _: InitializedParams) {
self.state.ensure_pattern().await;
}
async fn shutdown(&self) -> Result<()> {
Ok(())
}
async fn did_open(&self, params: DidOpenTextDocumentParams) {
let uri = params.text_document.uri.to_string();
let text = params.text_document.text.clone();
let version = params.text_document.version;
self.state
.documents
.insert(uri.clone(), (version, text.clone()));
self.state.scan_doc(&uri, &text, version).await;
self.state.publish_diagnostics(&uri, &text, version).await;
}
async fn did_change(&self, params: DidChangeTextDocumentParams) {
let uri = params.text_document.uri.to_string();
let version = params.text_document.version;
if let Some(change) = params.content_changes.into_iter().last() {
let text = change.text;
self.state.documents.insert(uri.clone(), (version, text));
if let Some((_, old_tx)) = self.state.debounce_tokens.remove(&uri) {
let _ = old_tx.send(());
}
let (cancel_tx, mut cancel_rx) = tokio::sync::watch::channel(());
self.state.debounce_tokens.insert(uri.clone(), cancel_tx);
let state = Arc::clone(&self.state);
let uri_clone = uri;
tokio::spawn(async move {
tokio::select! {
_ = tokio::time::sleep(std::time::Duration::from_millis(DEBOUNCE_DELAY_MS)) => {
let (version, text) = match state.documents.get(&uri_clone) {
Some(entry) => entry.clone(),
None => return,
};
state.scan_doc(&uri_clone, &text, version).await;
state.publish_diagnostics(&uri_clone, &text, version).await;
}
_ = cancel_rx.changed() => {
}
}
});
}
}
async fn did_close(&self, params: DidCloseTextDocumentParams) {
let uri = params.text_document.uri.to_string();
if let Some((_, tx)) = self.state.debounce_tokens.remove(&uri) {
let _ = tx.send(());
}
self.state.documents.remove(&uri);
self.state.doc_urls.remove(&uri);
self.state.doc_validations.remove(&uri);
self.state.doc_scopes.remove(&uri);
self.state.doc_coverages.remove(&uri);
self.state
.client
.publish_diagnostics(params.text_document.uri, vec![], None)
.await;
}
async fn hover(&self, params: HoverParams) -> Result<Option<Hover>> {
let uri = params
.text_document_position_params
.text_document
.uri
.to_string();
let pos = params.text_document_position_params.position;
let (version, text) = match self.state.documents.get(&uri) {
Some(entry) => entry.clone(),
None => return Ok(None),
};
let matches = self.state.scan_doc(&uri, &text, version).await;
if let Some(url_match) =
find_url_at_position(&matches, pos.line as usize, pos.character as usize)
{
if let Some(result) = self
.state
.query_spec_cached(&url_match.spec, &url_match.anchor)
{
let markdown = build_hover_content(&result);
return Ok(Some(Hover {
contents: HoverContents::Markup(MarkupContent {
kind: MarkupKind::Markdown,
value: markdown,
}),
range: Some(Range {
start: Position {
line: url_match.line as u32,
character: url_match.col_start as u32,
},
end: Position {
line: url_match.line as u32,
character: url_match.col_end as u32,
},
}),
}));
}
}
let validations = self.state.validate_doc(&uri, &text, version).await;
for v in &validations {
if v.step.line != pos.line as usize {
continue;
}
if (pos.character as usize) < v.step.col_start
|| (pos.character as usize) > v.step.col_end
{
continue;
}
let label = step_label(&v.step.number);
let md = match v.result {
MatchResult::Exact => format!("**Step {label}** \u{2014} exact match"),
MatchResult::Fuzzy => {
let mut s = format!("**Step {label}** \u{2014} fuzzy match");
if !v.spec_text.is_empty() {
s.push_str(&format!("\n\n**Spec:** {}", v.spec_text));
}
s
}
MatchResult::NotFound => {
format!("**Step {label}** \u{2014} not found in `{}`", v.algo_name)
}
MatchResult::Mismatch => {
let mut s = format!("**Step {label}** \u{2014} text differs from spec");
if !v.spec_text.is_empty() {
s.push_str(&format!("\n\n**Expected:** {}", v.spec_text));
}
s
}
};
let end_line = v.step.end_line.unwrap_or(v.step.line);
return Ok(Some(Hover {
contents: HoverContents::Markup(MarkupContent {
kind: MarkupKind::Markdown,
value: md,
}),
range: Some(Range {
start: Position {
line: v.step.line as u32,
character: v.step.col_start as u32,
},
end: Position {
line: end_line as u32,
character: v.step.col_end as u32,
},
}),
}));
}
Ok(None)
}
async fn inlay_hint(&self, params: InlayHintParams) -> Result<Option<Vec<InlayHint>>> {
let uri = params.text_document.uri.to_string();
let (version, text) = match self.state.documents.get(&uri) {
Some(entry) => entry.clone(),
None => return Ok(None),
};
let validations = self.state.validate_doc(&uri, &text, version).await;
if validations.is_empty() {
return Ok(None);
}
let range_start = params.range.start.line as usize;
let range_end = params.range.end.line as usize;
let mut hints = Vec::new();
for v in &validations {
if v.step.line < range_start || v.step.line > range_end {
continue;
}
let label_str = step_label(&v.step.number);
let (hint_label, tooltip) = match v.result {
MatchResult::Exact => (
" \u{2713}",
format!("**Step {label_str}** \u{2014} exact match"),
),
MatchResult::Fuzzy => {
let mut md = format!("**Step {label_str}** \u{2014} fuzzy match");
if !v.spec_text.is_empty() {
md.push_str(&format!("\n\n**Spec:** {}", v.spec_text));
}
(" \u{2713}", md)
}
MatchResult::NotFound => (
" \u{26a0}",
format!(
"**Step {label_str}** \u{2014} not found in `{}`",
v.algo_name
),
),
MatchResult::Mismatch => {
let mut md = format!("**Step {label_str}** \u{2014} text differs from spec");
if !v.spec_text.is_empty() {
md.push_str(&format!("\n\n**Expected:** {}", v.spec_text));
}
(" \u{26a0}", md)
}
};
let end_line = v.step.end_line.unwrap_or(v.step.line);
hints.push(InlayHint {
position: Position {
line: end_line as u32,
character: v.step.col_end as u32,
},
label: InlayHintLabel::String(hint_label.to_string()),
kind: Some(match v.result {
MatchResult::Exact | MatchResult::Fuzzy => InlayHintKind::TYPE,
_ => InlayHintKind::PARAMETER,
}),
tooltip: Some(InlayHintTooltip::MarkupContent(MarkupContent {
kind: MarkupKind::Markdown,
value: tooltip,
})),
padding_left: Some(true),
padding_right: None,
text_edits: None,
data: None,
});
}
Ok(if hints.is_empty() { None } else { Some(hints) })
}
async fn code_lens(&self, params: CodeLensParams) -> Result<Option<Vec<CodeLens>>> {
let uri = params.text_document.uri.to_string();
let (version, text) = match self.state.documents.get(&uri) {
Some(entry) => entry.clone(),
None => return Ok(None),
};
let coverages = self.state.coverage_doc(&uri, &text, version).await;
if coverages.is_empty() {
return Ok(None);
}
let mut lenses = Vec::new();
for (url_match, cov) in &coverages {
let missing_labels: Vec<String> = cov.missing.iter().map(|s| step_label(s)).collect();
lenses.push(CodeLens {
range: Range {
start: Position {
line: url_match.line as u32,
character: 0,
},
end: Position {
line: url_match.line as u32,
character: 0,
},
},
command: Some(Command {
title: cov.summary(),
command: "webspecLens.showCoverage".to_string(),
arguments: Some(vec![
serde_json::Value::String(cov.anchor.clone()),
serde_json::Value::Number(serde_json::Number::from(cov.total_steps)),
serde_json::to_value(&missing_labels).unwrap_or_default(),
]),
}),
data: None,
});
}
Ok(if lenses.is_empty() {
None
} else {
Some(lenses)
})
}
}
pub async fn serve_stdio() {
let stdin = tokio::io::stdin();
let stdout = tokio::io::stdout();
let (service, socket) = LspService::new(|client| Backend {
state: Arc::new(State::new(client)),
});
Server::new(stdin, stdout, socket).serve(service).await;
}