implement textDocument/codeAction
This commit is contained in:
parent
ca58cbb3f3
commit
1b64db8a4c
@ -12,6 +12,7 @@ const references = @import("references.zig");
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const offsets = @import("offsets.zig");
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const semantic_tokens = @import("semantic_tokens.zig");
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const inlay_hints = @import("inlay_hints.zig");
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const code_actions = @import("code_actions.zig");
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const shared = @import("shared.zig");
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const Ast = std.zig.Ast;
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const tracy = @import("tracy.zig");
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@ -1569,7 +1570,7 @@ fn initializeHandler(server: *Server, writer: anytype, id: types.RequestId, req:
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.completionProvider = .{ .resolveProvider = false, .triggerCharacters = &[_][]const u8{ ".", ":", "@", "]" }, .completionItem = .{ .labelDetailsSupport = true } },
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.documentHighlightProvider = true,
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.hoverProvider = true,
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.codeActionProvider = false,
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.codeActionProvider = true,
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.declarationProvider = true,
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.definitionProvider = true,
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.typeDefinitionProvider = true,
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@ -2257,6 +2258,38 @@ fn inlayHintHandler(server: *Server, writer: anytype, id: types.RequestId, req:
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return try respondGeneric(writer, id, null_result_response);
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}
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fn codeActionHandler(server: *Server, writer: anytype, id: types.RequestId, req: requests.CodeAction) !void {
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const handle = server.document_store.getHandle(req.params.textDocument.uri) orelse {
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log.warn("Trying to get code actions of non existent document {s}", .{req.params.textDocument.uri});
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return try respondGeneric(writer, id, null_result_response);
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};
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const allocator = server.arena.allocator();
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var builder = code_actions.Builder{
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.arena = &server.arena,
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.document_store = &server.document_store,
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.handle = handle,
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.offset_encoding = server.offset_encoding,
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};
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var actions = std.ArrayListUnmanaged(types.CodeAction){};
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for (req.params.context.diagnostics) |diagnostic| {
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try builder.generateCodeAction(diagnostic, &actions);
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}
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for (actions.items) |*action| {
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// TODO query whether SourceFixAll is supported by the server
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if (action.kind == .SourceFixAll) action.kind = .QuickFix;
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}
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return try send(writer, allocator, types.Response{
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.id = id,
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.result = .{ .CodeAction = actions.items },
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});
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}
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// Needed for the hack seen below.
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fn extractErr(val: anytype) anyerror {
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val catch |e| return e;
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@ -2368,6 +2401,7 @@ pub fn processJsonRpc(server: *Server, writer: anytype, json: []const u8) !void
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.{ "textDocument/rename", requests.Rename, renameHandler },
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.{ "textDocument/references", requests.References, referencesHandler },
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.{ "textDocument/documentHighlight", requests.DocumentHighlight, documentHighlightHandler },
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.{ "textDocument/codeAction", requests.CodeAction, codeActionHandler },
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.{ "workspace/didChangeConfiguration", std.json.Value, didChangeConfigurationHandler },
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};
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@ -2408,7 +2442,6 @@ pub fn processJsonRpc(server: *Server, writer: anytype, json: []const u8) !void
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// needs a response) or false if the method is a notification (in which
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// case it should be silently ignored)
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const unimplemented_map = std.ComptimeStringMap(bool, .{
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.{ "textDocument/codeAction", true },
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.{ "textDocument/codeLens", true },
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.{ "textDocument/documentLink", true },
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.{ "textDocument/rangeFormatting", true },
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485
src/code_actions.zig
Normal file
485
src/code_actions.zig
Normal file
@ -0,0 +1,485 @@
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const std = @import("std");
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const Ast = std.zig.Ast;
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const DocumentStore = @import("DocumentStore.zig");
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const analysis = @import("analysis.zig");
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const ast = @import("ast.zig");
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const types = @import("types.zig");
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const requests = @import("requests.zig");
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const offsets = @import("offsets.zig");
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pub const Builder = struct {
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arena: *std.heap.ArenaAllocator,
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document_store: *DocumentStore,
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handle: *DocumentStore.Handle,
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offset_encoding: offsets.Encoding,
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pub fn generateCodeAction(
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builder: *Builder,
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diagnostic: types.Diagnostic,
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actions: *std.ArrayListUnmanaged(types.CodeAction),
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) error{OutOfMemory}!void {
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const kind = DiagnosticKind.parse(diagnostic.message) orelse return;
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const loc = offsets.rangeToLoc(builder.text(), diagnostic.range, builder.offset_encoding);
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switch (kind) {
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.unused => |id| switch (id) {
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.@"function parameter" => try handleUnusedFunctionParameter(builder, actions, loc),
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.@"local constant" => try handleUnusedVariableOrConstant(builder, actions, loc),
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.@"local variable" => try handleUnusedVariableOrConstant(builder, actions, loc),
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.@"loop index capture" => try handleUnusedIndexCapture(builder, actions, loc),
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.@"capture" => try handleUnusedCapture(builder, actions, loc),
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},
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.pointless_discard => try handlePointlessDiscard(builder, actions, loc),
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.omit_discard => |id| switch (id) {
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.@"index capture" => try handleUnusedIndexCapture(builder, actions, loc),
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.@"error capture" => try handleUnusedCapture(builder, actions, loc),
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},
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.unreachable_code => {
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// TODO
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// autofix: comment out code
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// fix: remove code
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},
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}
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}
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pub fn createTextEditLoc(self: *Builder, loc: offsets.Loc, new_text: []const u8) types.TextEdit {
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const range = offsets.locToRange(self.text(), loc, self.offset_encoding);
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return types.TextEdit{ .range = range, .newText = new_text };
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}
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pub fn createTextEditPos(self: *Builder, index: usize, new_text: []const u8) types.TextEdit {
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const position = offsets.indexToPosition(self.text(), index, self.offset_encoding);
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return types.TextEdit{ .range = .{ .start = position, .end = position }, .newText = new_text };
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}
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pub fn createWorkspaceEdit(self: *Builder, edits: []const types.TextEdit) error{OutOfMemory}!types.WorkspaceEdit {
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var text_edits = std.ArrayListUnmanaged(types.TextEdit){};
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try text_edits.appendSlice(self.arena.allocator(), edits);
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var workspace_edit = types.WorkspaceEdit{ .changes = .{} };
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try workspace_edit.changes.putNoClobber(self.arena.allocator(), self.handle.uri(), text_edits);
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return workspace_edit;
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}
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fn text(self: *Builder) []const u8 {
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return self.handle.document.text;
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}
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};
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fn handleUnusedFunctionParameter(builder: *Builder, actions: *std.ArrayListUnmanaged(types.CodeAction), loc: offsets.Loc) !void {
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const identifier_name = offsets.locToSlice(builder.text(), loc);
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const tree = builder.handle.tree;
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const node_tags = tree.nodes.items(.tag);
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const node_datas = tree.nodes.items(.data);
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const node_tokens = tree.nodes.items(.main_token);
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const token_starts = tree.tokens.items(.start);
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const decl = (try analysis.lookupSymbolGlobal(
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builder.document_store,
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builder.arena,
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builder.handle,
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identifier_name,
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loc.start,
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)) orelse return;
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const payload = switch (decl.decl.*) {
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.param_payload => |pay| pay,
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else => return,
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};
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std.debug.assert(node_tags[payload.func] == .fn_decl);
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const block = node_datas[payload.func].rhs;
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const indent = offsets.lineSliceUntilIndex(builder.text(), token_starts[node_tokens[payload.func]]).len;
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const new_text = try createDiscardText(builder.arena.allocator(), identifier_name, indent + 4);
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const index = token_starts[node_tokens[block]] + 1;
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const action1 = types.CodeAction{
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.title = "discard function parameter",
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.kind = .SourceFixAll,
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.isPreferred = true,
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.edit = try builder.createWorkspaceEdit(&.{builder.createTextEditPos(index, new_text)}),
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};
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const param_loc = .{
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.start = offsets.tokenToIndex(tree, ast.paramFirstToken(tree, payload.param)),
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.end = offsets.tokenToLoc(tree, ast.paramLastToken(tree, payload.param)).end,
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};
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// TODO fix formatting
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// TODO remove trailing comma on last parameter
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const action2 = types.CodeAction{
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.title = "remove function parameter",
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.kind = .QuickFix,
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.isPreferred = false,
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.edit = try builder.createWorkspaceEdit(&.{builder.createTextEditLoc(param_loc, "")}),
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};
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try actions.appendSlice(builder.arena.allocator(), &.{ action1, action2 });
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}
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fn handleUnusedVariableOrConstant(builder: *Builder, actions: *std.ArrayListUnmanaged(types.CodeAction), loc: offsets.Loc) !void {
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const identifier_name = offsets.locToSlice(builder.text(), loc);
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const tree = builder.handle.tree;
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const token_tags = tree.tokens.items(.tag);
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const token_starts = tree.tokens.items(.start);
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const decl = (try analysis.lookupSymbolGlobal(
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builder.document_store,
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builder.arena,
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builder.handle,
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identifier_name,
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loc.start,
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)) orelse return;
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const node = switch (decl.decl.*) {
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.ast_node => |node| node,
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else => return,
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};
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const first_token = tree.firstToken(node);
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const last_token = ast.lastToken(tree, node) + 1;
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const indent = offsets.lineSliceUntilIndex(builder.text(), token_starts[first_token]).len;
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if (token_tags[last_token] != .semicolon) return;
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const new_text = try createDiscardText(builder.arena.allocator(), identifier_name, indent);
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const index = token_starts[last_token] + 1;
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try actions.append(builder.arena.allocator(), .{
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.title = "discard value",
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.kind = .SourceFixAll,
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.isPreferred = true,
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.edit = try builder.createWorkspaceEdit(&.{builder.createTextEditPos(index, new_text)}),
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});
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}
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fn handleUnusedIndexCapture(builder: *Builder, actions: *std.ArrayListUnmanaged(types.CodeAction), loc: offsets.Loc) !void {
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const capture_locs = getCaptureLoc(builder.text(), loc, true) orelse return;
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// TODO support discarding without modifying the capture
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// by adding a discard in the block scope
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const is_value_discarded = std.mem.eql(u8, offsets.locToSlice(builder.text(), capture_locs.value), "_");
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if (is_value_discarded) {
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// |_, i| ->
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// TODO fix formatting
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try actions.append(builder.arena.allocator(), .{
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.title = "remove capture",
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.kind = .QuickFix,
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.isPreferred = true,
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.edit = try builder.createWorkspaceEdit(&.{builder.createTextEditLoc(capture_locs.loc, "")}),
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});
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} else {
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// |v, i| -> |v|
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// |v, _| -> |v|
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try actions.append(builder.arena.allocator(), .{
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.title = "remove index capture",
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.kind = .QuickFix,
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.isPreferred = true,
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.edit = try builder.createWorkspaceEdit(&.{builder.createTextEditLoc(
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.{ .start = capture_locs.value.end, .end = capture_locs.loc.end - 1 },
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"",
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)}),
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});
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}
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}
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fn handleUnusedCapture(builder: *Builder, actions: *std.ArrayListUnmanaged(types.CodeAction), loc: offsets.Loc) !void {
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const capture_locs = getCaptureLoc(builder.text(), loc, false) orelse return;
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// TODO support discarding without modifying the capture
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// by adding a discard in the block scope
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if (capture_locs.index != null) {
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// |v, i| -> |_, i|
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try actions.append(builder.arena.allocator(), .{
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.title = "discard capture",
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.kind = .QuickFix,
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.isPreferred = true,
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.edit = try builder.createWorkspaceEdit(&.{builder.createTextEditLoc(capture_locs.value, "_")}),
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});
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} else {
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// |v| ->
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// TODO fix formatting
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try actions.append(builder.arena.allocator(), .{
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.title = "remove capture",
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.kind = .QuickFix,
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.isPreferred = true,
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.edit = try builder.createWorkspaceEdit(&.{builder.createTextEditLoc(capture_locs.loc, "")}),
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});
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}
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}
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fn handlePointlessDiscard(builder: *Builder, actions: *std.ArrayListUnmanaged(types.CodeAction), loc: offsets.Loc) !void {
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const edit_loc = getDiscardLoc(builder.text(), loc) orelse return;
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try actions.append(builder.arena.allocator(), .{
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.title = "remove pointless discard",
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.kind = .SourceFixAll,
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.isPreferred = true,
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.edit = try builder.createWorkspaceEdit(&.{
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builder.createTextEditLoc(edit_loc, ""),
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}),
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});
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}
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// returns a discard string `\n{indent}_ = identifier_name;`
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fn createDiscardText(allocator: std.mem.Allocator, identifier_name: []const u8, indent: usize) ![]const u8 {
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const new_text_len = 1 + indent + "_ = ;".len + identifier_name.len;
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var new_text = try std.ArrayListUnmanaged(u8).initCapacity(allocator, new_text_len);
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errdefer new_text.deinit(allocator);
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new_text.appendAssumeCapacity('\n');
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new_text.appendNTimesAssumeCapacity(' ', indent);
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new_text.appendSliceAssumeCapacity("_ = ");
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new_text.appendSliceAssumeCapacity(identifier_name);
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new_text.appendAssumeCapacity(';');
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return new_text.toOwnedSlice(allocator);
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}
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const DiagnosticKind = union(enum) {
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unused: IdCat,
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pointless_discard: IdCat,
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omit_discard: DiscardCat,
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unreachable_code,
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const IdCat = enum {
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@"function parameter",
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@"local constant",
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@"local variable",
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@"loop index capture",
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@"capture",
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};
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const DiscardCat = enum {
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// "discard of index capture; omit it instead"
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@"index capture",
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// "discard of error capture; omit it instead"
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@"error capture",
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};
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pub fn parse(diagnostic_message: []const u8) ?DiagnosticKind {
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const msg = diagnostic_message;
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if (std.mem.startsWith(u8, msg, "unused ")) {
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return DiagnosticKind{
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.unused = parseEnum(IdCat, msg["unused ".len..]) orelse return null,
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};
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} else if (std.mem.startsWith(u8, msg, "pointless discard of ")) {
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return DiagnosticKind{
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.pointless_discard = parseEnum(IdCat, msg["pointless discard of ".len..]) orelse return null,
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};
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} else if (std.mem.startsWith(u8, msg, "discard of ")) {
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return DiagnosticKind{
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.omit_discard = parseEnum(DiscardCat, msg["discard of ".len..]) orelse return null,
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};
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}
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return null;
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}
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fn parseEnum(comptime T: type, message: []const u8) ?T {
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inline for (std.meta.fields(T)) |field| {
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if (std.mem.startsWith(u8, message, field.name)) {
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// is there a better way to achieve this?
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return @intToEnum(T, field.value);
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}
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}
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return null;
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}
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};
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/// takes the location of an identifier which is part of a discard `_ = location_here;`
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/// and returns the location from '_' until ';' or null on failure
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fn getDiscardLoc(text: []const u8, loc: offsets.Loc) ?offsets.Loc {
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// check of the loc points to a valid identifier
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for (offsets.locToSlice(text, loc)) |c| {
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if (!isSymbolChar(c)) return null;
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}
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// check if the identifier is followed by a colon
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const colon_position = found: {
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var i = loc.end;
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while (i < text.len) : (i += 1) {
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switch (text[i]) {
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' ' => continue,
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';' => break :found i + 1,
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else => return null,
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}
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}
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return null;
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};
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// check if the identifier is preceed by a equal sign and then an underscore
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var i: usize = loc.start - 1;
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var found_equal_sign = false;
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const underscore_position = found: {
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while (true) : (i -= 1) {
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if (i == 0) return null;
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switch (text[i]) {
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' ' => {},
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'=' => {
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if (found_equal_sign) return null;
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found_equal_sign = true;
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},
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'_' => if (found_equal_sign) break :found i else return null,
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else => return null,
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}
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}
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};
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// move backwards until we find a newline
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i = underscore_position - 1;
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const start_position = found: {
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while (true) : (i -= 1) {
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if (i == 0) break :found underscore_position;
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switch (text[i]) {
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' ' => {},
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'\n' => break :found i,
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else => break :found underscore_position,
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}
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}
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};
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return offsets.Loc{
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.start = start_position,
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.end = colon_position,
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};
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}
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const CaptureLocs = struct {
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loc: offsets.Loc,
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value: offsets.Loc,
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index: ?offsets.Loc,
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};
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/// takes the location of an identifier which is part of a payload `|value, index|`
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/// and returns the location from '|' until '|' or null on failure
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/// use `is_index_payload` to indicate whether `loc` points to `value` or `index`
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fn getCaptureLoc(text: []const u8, loc: offsets.Loc, is_index_payload: bool) ?CaptureLocs {
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const value_end = if (!is_index_payload) loc.end else found: {
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||||
// move back until we find a comma
|
||||
const comma_position = found_comma: {
|
||||
var i = loc.start - 1;
|
||||
while (i != 0) : (i -= 1) {
|
||||
switch (text[i]) {
|
||||
' ' => continue,
|
||||
',' => break :found_comma i,
|
||||
else => return null,
|
||||
}
|
||||
} else return null;
|
||||
};
|
||||
|
||||
// trim space
|
||||
var i = comma_position - 1;
|
||||
while (i != 0) : (i -= 1) {
|
||||
switch (text[i]) {
|
||||
' ' => continue,
|
||||
else => {
|
||||
if (!isSymbolChar(text[i])) return null;
|
||||
break :found i + 1;
|
||||
},
|
||||
}
|
||||
} else return null;
|
||||
};
|
||||
|
||||
const value_start = if (!is_index_payload) loc.start else found: {
|
||||
// move back until we find a non identifier character
|
||||
var i = value_end - 1;
|
||||
while (i != 0) : (i -= 1) {
|
||||
if (isSymbolChar(text[i])) continue;
|
||||
switch (text[i]) {
|
||||
' ', '|', '*' => break :found i + 1,
|
||||
else => return null,
|
||||
}
|
||||
} else return null;
|
||||
};
|
||||
|
||||
var index: ?offsets.Loc = null;
|
||||
|
||||
if (is_index_payload) {
|
||||
index = loc;
|
||||
} else blk: {
|
||||
// move forward until we find a comma
|
||||
const comma_position = found_comma: {
|
||||
var i = value_end;
|
||||
while (i < text.len) : (i += 1) {
|
||||
switch (text[i]) {
|
||||
' ' => continue,
|
||||
',' => break :found_comma i,
|
||||
else => break :blk,
|
||||
}
|
||||
}
|
||||
break :blk;
|
||||
};
|
||||
|
||||
// trim space
|
||||
const index_start = found_start: {
|
||||
var i = comma_position + 1;
|
||||
while (i < text.len) : (i += 1) {
|
||||
switch (text[i]) {
|
||||
' ' => continue,
|
||||
else => {
|
||||
if (!isSymbolChar(text[i])) break :blk;
|
||||
break :found_start i;
|
||||
},
|
||||
}
|
||||
}
|
||||
break :blk;
|
||||
};
|
||||
|
||||
// move forward until we find a non identifier character
|
||||
var i = index_start + 1;
|
||||
while (i < text.len) : (i += 1) {
|
||||
if (isSymbolChar(text[i])) continue;
|
||||
index = offsets.Loc{
|
||||
.start = index_start,
|
||||
.end = i,
|
||||
};
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
const start_pipe_position = found: {
|
||||
var i = value_start - 1;
|
||||
while (i != 0) : (i -= 1) {
|
||||
switch (text[i]) {
|
||||
' ' => continue,
|
||||
'|' => break :found i,
|
||||
else => return null,
|
||||
}
|
||||
} else return null;
|
||||
};
|
||||
|
||||
const end_pipe_position = found: {
|
||||
var i: usize = if (index) |index_loc| index_loc.end else value_end;
|
||||
while (i < text.len) : (i += 1) {
|
||||
switch (text[i]) {
|
||||
' ' => continue,
|
||||
'|' => break :found i + 1,
|
||||
else => return null,
|
||||
}
|
||||
} else return null;
|
||||
};
|
||||
|
||||
return CaptureLocs{
|
||||
.loc = .{ .start = start_pipe_position, .end = end_pipe_position },
|
||||
.value = .{ .start = value_start, .end = value_end },
|
||||
.index = index,
|
||||
};
|
||||
}
|
||||
|
||||
fn isSymbolChar(char: u8) bool {
|
||||
return std.ascii.isAlNum(char) or char == '_';
|
||||
}
|
Loading…
Reference in New Issue
Block a user