1 files changed, 436 insertions, 0 deletions

diff --git a/crates/ra_lsp_server/src/main_loop/handlers.rs b/crates/ra_lsp_server/src/main_loop/handlers.rs
new file mode 100644
index 000000000..568f5344c
--- /dev/null
+++ b/crates/ra_lsp_server/src/main_loop/handlers.rs
@@ -0,0 +1,436 @@
+use std::collections::HashMap;
+
+use languageserver_types::{
+    Diagnostic, DiagnosticSeverity, DocumentSymbol,
+    Command, TextDocumentIdentifier,
+    SymbolInformation, Position, Location, TextEdit,
+    CompletionItem, InsertTextFormat, CompletionItemKind,
+};
+use serde_json::to_value;
+use ra_analysis::{Query, FileId, RunnableKind, JobToken};
+use ra_syntax::{
+    text_utils::contains_offset_nonstrict,
+};
+
+use ::{
+    req::{self, Decoration}, Result,
+    conv::{Conv, ConvWith, TryConvWith, MapConvWith, to_location},
+    server_world::ServerWorld,
+    project_model::TargetKind,
+};
+
+pub fn handle_syntax_tree(
+    world: ServerWorld,
+    params: req::SyntaxTreeParams,
+    _token: JobToken,
+) -> Result<String> {
+    let id = params.text_document.try_conv_with(&world)?;
+    let res = world.analysis().syntax_tree(id);
+    Ok(res)
+}
+
+pub fn handle_extend_selection(
+    world: ServerWorld,
+    params: req::ExtendSelectionParams,
+    _token: JobToken,
+) -> Result<req::ExtendSelectionResult> {
+    let file_id = params.text_document.try_conv_with(&world)?;
+    let file = world.analysis().file_syntax(file_id);
+    let line_index = world.analysis().file_line_index(file_id);
+    let selections = params.selections.into_iter()
+        .map_conv_with(&line_index)
+        .map(|r| world.analysis().extend_selection(&file, r))
+        .map_conv_with(&line_index)
+        .collect();
+    Ok(req::ExtendSelectionResult { selections })
+}
+
+pub fn handle_find_matching_brace(
+    world: ServerWorld,
+    params: req::FindMatchingBraceParams,
+    _token: JobToken,
+) -> Result<Vec<Position>> {
+    let file_id = params.text_document.try_conv_with(&world)?;
+    let file = world.analysis().file_syntax(file_id);
+    let line_index = world.analysis().file_line_index(file_id);
+    let res = params.offsets
+        .into_iter()
+        .map_conv_with(&line_index)
+        .map(|offset| {
+            world.analysis().matching_brace(&file, offset).unwrap_or(offset)
+        })
+        .map_conv_with(&line_index)
+        .collect();
+    Ok(res)
+}
+
+pub fn handle_join_lines(
+    world: ServerWorld,
+    params: req::JoinLinesParams,
+    _token: JobToken,
+) -> Result<req::SourceChange> {
+    let file_id = params.text_document.try_conv_with(&world)?;
+    let line_index = world.analysis().file_line_index(file_id);
+    let range = params.range.conv_with(&line_index);
+    world.analysis().join_lines(file_id, range)
+        .try_conv_with(&world)
+}
+
+pub fn handle_on_type_formatting(
+    world: ServerWorld,
+    params: req::DocumentOnTypeFormattingParams,
+    _token: JobToken,
+) -> Result<Option<Vec<TextEdit>>> {
+    if params.ch != "=" {
+        return Ok(None);
+    }
+
+    let file_id = params.text_document.try_conv_with(&world)?;
+    let line_index = world.analysis().file_line_index(file_id);
+    let offset = params.position.conv_with(&line_index);
+    let edits = match world.analysis().on_eq_typed(file_id, offset) {
+        None => return Ok(None),
+        Some(mut action) => action.source_file_edits.pop().unwrap().edits,
+    };
+    let edits = edits.into_iter().map_conv_with(&line_index).collect();
+    Ok(Some(edits))
+}
+
+pub fn handle_document_symbol(
+    world: ServerWorld,
+    params: req::DocumentSymbolParams,
+    _token: JobToken,
+) -> Result<Option<req::DocumentSymbolResponse>> {
+    let file_id = params.text_document.try_conv_with(&world)?;
+    let line_index = world.analysis().file_line_index(file_id);
+
+    let mut parents: Vec<(DocumentSymbol, Option<usize>)> = Vec::new();
+
+    for symbol in world.analysis().file_structure(file_id) {
+        let doc_symbol = DocumentSymbol {
+            name: symbol.label,
+            detail: Some("".to_string()),
+            kind: symbol.kind.conv(),
+            deprecated: None,
+            range: symbol.node_range.conv_with(&line_index),
+            selection_range: symbol.navigation_range.conv_with(&line_index),
+            children: None,
+        };
+        parents.push((doc_symbol, symbol.parent));
+    }
+    let mut res = Vec::new();
+    while let Some((node, parent)) = parents.pop() {
+        match parent {
+            None => res.push(node),
+            Some(i) => {
+                let children = &mut parents[i].0.children;
+                if children.is_none() {
+                    *children = Some(Vec::new());
+                }
+                children.as_mut().unwrap().push(node);
+            }
+        }
+    }
+
+    Ok(Some(req::DocumentSymbolResponse::Nested(res)))
+}
+
+pub fn handle_workspace_symbol(
+    world: ServerWorld,
+    params: req::WorkspaceSymbolParams,
+    token: JobToken,
+) -> Result<Option<Vec<SymbolInformation>>> {
+    let all_symbols = params.query.contains("#");
+    let libs = params.query.contains("*");
+    let query = {
+        let query: String = params.query.chars()
+            .filter(|&c| c != '#' && c != '*')
+            .collect();
+        let mut q = Query::new(query);
+        if !all_symbols {
+            q.only_types();
+        }
+        if libs {
+            q.libs();
+        }
+        q.limit(128);
+        q
+    };
+    let mut res = exec_query(&world, query, &token)?;
+    if res.is_empty() && !all_symbols {
+        let mut query = Query::new(params.query);
+        query.limit(128);
+        res = exec_query(&world, query, &token)?;
+    }
+
+    return Ok(Some(res));
+
+    fn exec_query(world: &ServerWorld, query: Query, token: &JobToken) -> Result<Vec<SymbolInformation>> {
+        let mut res = Vec::new();
+        for (file_id, symbol) in world.analysis().symbol_search(query, token) {
+            let line_index = world.analysis().file_line_index(file_id);
+            let info = SymbolInformation {
+                name: symbol.name.to_string(),
+                kind: symbol.kind.conv(),
+                location: to_location(
+                    file_id, symbol.node_range,
+                    world, &line_index
+                )?,
+                container_name: None,
+            };
+            res.push(info);
+        };
+        Ok(res)
+    }
+}
+
+pub fn handle_goto_definition(
+    world: ServerWorld,
+    params: req::TextDocumentPositionParams,
+    token: JobToken,
+) -> Result<Option<req::GotoDefinitionResponse>> {
+    let file_id = params.text_document.try_conv_with(&world)?;
+    let line_index = world.analysis().file_line_index(file_id);
+    let offset = params.position.conv_with(&line_index);
+    let mut res = Vec::new();
+    for (file_id, symbol) in world.analysis().approximately_resolve_symbol(file_id, offset, &token) {
+        let line_index = world.analysis().file_line_index(file_id);
+        let location = to_location(
+            file_id, symbol.node_range,
+            &world, &line_index,
+        )?;
+        res.push(location)
+    }
+    Ok(Some(req::GotoDefinitionResponse::Array(res)))
+}
+
+pub fn handle_parent_module(
+    world: ServerWorld,
+    params: TextDocumentIdentifier,
+    _token: JobToken,
+) -> Result<Vec<Location>> {
+    let file_id = params.try_conv_with(&world)?;
+    let mut res = Vec::new();
+    for (file_id, symbol) in world.analysis().parent_module(file_id) {
+        let line_index = world.analysis().file_line_index(file_id);
+        let location = to_location(
+            file_id, symbol.node_range,
+            &world, &line_index
+        )?;
+        res.push(location);
+    }
+    Ok(res)
+}
+
+pub fn handle_runnables(
+    world: ServerWorld,
+    params: req::RunnablesParams,
+    _token: JobToken,
+) -> Result<Vec<req::Runnable>> {
+    let file_id = params.text_document.try_conv_with(&world)?;
+    let line_index = world.analysis().file_line_index(file_id);
+    let offset = params.position.map(|it| it.conv_with(&line_index));
+    let mut res = Vec::new();
+    for runnable in world.analysis().runnables(file_id) {
+        if let Some(offset) = offset {
+            if !contains_offset_nonstrict(runnable.range, offset) {
+                continue;
+            }
+        }
+
+        let args = runnable_args(&world, file_id, &runnable.kind);
+
+        let r = req::Runnable {
+            range: runnable.range.conv_with(&line_index),
+            label: match &runnable.kind {
+                RunnableKind::Test { name } =>
+                    format!("test {}", name),
+                RunnableKind::Bin =>
+                    "run binary".to_string(),
+            },
+            bin: "cargo".to_string(),
+            args,
+            env: {
+                let mut m = HashMap::new();
+                m.insert(
+                    "RUST_BACKTRACE".to_string(),
+                    "short".to_string(),
+                );
+                m
+            }
+        };
+        res.push(r);
+    }
+    return Ok(res);
+
+    fn runnable_args(world: &ServerWorld, file_id: FileId, kind: &RunnableKind) -> Vec<String> {
+        let spec = if let Some(&crate_id) = world.analysis().crate_for(file_id).first() {
+            let file_id = world.analysis().crate_root(crate_id);
+            let path = world.path_map.get_path(file_id);
+            world.workspaces.iter()
+                .filter_map(|ws| {
+                    let tgt = ws.target_by_root(path)?;
+                    Some((tgt.package(ws).name(ws).clone(), tgt.name(ws).clone(), tgt.kind(ws)))
+                })
+                .next()
+        } else {
+            None
+        };
+        let mut res = Vec::new();
+        match kind {
+                RunnableKind::Test { name } => {
+                    res.push("test".to_string());
+                    if let Some((pkg_name, tgt_name, tgt_kind)) = spec {
+                        spec_args(pkg_name, tgt_name, tgt_kind, &mut res);
+                    }
+                    res.push("--".to_string());
+                    res.push(name.to_string());
+                    res.push("--nocapture".to_string());
+                }
+                RunnableKind::Bin => {
+                    res.push("run".to_string());
+                    if let Some((pkg_name, tgt_name, tgt_kind)) = spec {
+                        spec_args(pkg_name, tgt_name, tgt_kind, &mut res);
+                    }
+                }
+            }
+        res
+    }
+
+    fn spec_args(pkg_name: &str, tgt_name: &str, tgt_kind: TargetKind, buf: &mut Vec<String>) {
+        buf.push("--package".to_string());
+        buf.push(pkg_name.to_string());
+        match tgt_kind {
+            TargetKind::Bin => {
+                buf.push("--bin".to_string());
+                buf.push(tgt_name.to_string());
+            }
+            TargetKind::Test => {
+                buf.push("--test".to_string());
+                buf.push(tgt_name.to_string());
+            }
+            TargetKind::Bench => {
+                buf.push("--bench".to_string());
+                buf.push(tgt_name.to_string());
+            }
+            TargetKind::Example => {
+                buf.push("--example".to_string());
+                buf.push(tgt_name.to_string());
+            }
+            TargetKind::Lib => {
+                buf.push("--lib".to_string());
+            }
+            TargetKind::Other => (),
+        }
+    }
+}
+
+pub fn handle_decorations(
+    world: ServerWorld,
+    params: TextDocumentIdentifier,
+    _token: JobToken,
+) -> Result<Vec<Decoration>> {
+    let file_id = params.try_conv_with(&world)?;
+    Ok(highlight(&world, file_id))
+}
+
+pub fn handle_completion(
+    world: ServerWorld,
+    params: req::CompletionParams,
+    _token: JobToken,
+) -> Result<Option<req::CompletionResponse>> {
+    let file_id = params.text_document.try_conv_with(&world)?;
+    let line_index = world.analysis().file_line_index(file_id);
+    let offset = params.position.conv_with(&line_index);
+    let items = match world.analysis().completions(file_id, offset) {
+        None => return Ok(None),
+        Some(items) => items,
+    };
+    let items = items.into_iter()
+        .map(|item| {
+            let mut res = CompletionItem {
+                label: item.label,
+                filter_text: item.lookup,
+                .. Default::default()
+            };
+            if let Some(snip) = item.snippet {
+                res.insert_text = Some(snip);
+                res.insert_text_format = Some(InsertTextFormat::Snippet);
+                res.kind = Some(CompletionItemKind::Keyword);
+            };
+            res
+        })
+        .collect();
+
+    Ok(Some(req::CompletionResponse::Array(items)))
+}
+
+pub fn handle_code_action(
+    world: ServerWorld,
+    params: req::CodeActionParams,
+    _token: JobToken,
+) -> Result<Option<Vec<Command>>> {
+    let file_id = params.text_document.try_conv_with(&world)?;
+    let line_index = world.analysis().file_line_index(file_id);
+    let range = params.range.conv_with(&line_index);
+
+    let assists = world.analysis().assists(file_id, range).into_iter();
+    let fixes = world.analysis().diagnostics(file_id).into_iter()
+        .filter_map(|d| Some((d.range, d.fix?)))
+        .filter(|(range, _fix)| contains_offset_nonstrict(*range, range.start()))
+        .map(|(_range, fix)| fix);
+
+    let mut res = Vec::new();
+    for source_edit in assists.chain(fixes) {
+        let title = source_edit.label.clone();
+        let edit = source_edit.try_conv_with(&world)?;
+        let cmd = Command {
+            title,
+            command: "libsyntax-rust.applySourceChange".to_string(),
+            arguments: Some(vec![to_value(edit).unwrap()]),
+        };
+        res.push(cmd);
+    }
+
+    Ok(Some(res))
+}
+
+pub fn publish_diagnostics(
+    world: ServerWorld,
+    file_id: FileId,
+) -> Result<req::PublishDiagnosticsParams> {
+    let uri = world.file_id_to_uri(file_id)?;
+    let line_index = world.analysis().file_line_index(file_id);
+    let diagnostics = world.analysis().diagnostics(file_id)
+        .into_iter()
+        .map(|d| Diagnostic {
+            range: d.range.conv_with(&line_index),
+            severity: Some(DiagnosticSeverity::Error),
+            code: None,
+            source: Some("libsyntax2".to_string()),
+            message: d.message,
+            related_information: None,
+        }).collect();
+    Ok(req::PublishDiagnosticsParams { uri, diagnostics })
+}
+
+pub fn publish_decorations(
+    world: ServerWorld,
+    file_id: FileId,
+) -> Result<req::PublishDecorationsParams> {
+    let uri = world.file_id_to_uri(file_id)?;
+    Ok(req::PublishDecorationsParams {
+        uri,
+        decorations: highlight(&world, file_id),
+    })
+}
+
+fn highlight(world: &ServerWorld, file_id: FileId) -> Vec<Decoration> {
+    let line_index = world.analysis().file_line_index(file_id);
+    world.analysis().highlight(file_id)
+        .into_iter()
+        .map(|h| Decoration {
+            range: h.range.conv_with(&line_index),
+            tag: h.tag,
+        }).collect()
+}