zls/src/main.zig

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const std = @import("std");
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const build_options = @import("build_options");
const Config = @import("config.zig");
const DocumentStore = @import("document_store.zig");
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const DebugAllocator = @import("debug_allocator.zig");
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const readRequestHeader = @import("header.zig").readRequestHeader;
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const data = @import("data/" ++ build_options.data_version ++ ".zig");
const types = @import("types.zig");
const analysis = @import("analysis.zig");
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// Code is largely based off of https://github.com/andersfr/zig-lsp/blob/master/server.zig
var stdout: std.fs.File.OutStream = undefined;
var allocator: *std.mem.Allocator = undefined;
var document_store: DocumentStore = undefined;
const initialize_response =
\\,"result":{"capabilities":{"signatureHelpProvider":{"triggerCharacters":["(",","]},"textDocumentSync":1,"completionProvider":{"resolveProvider":false,"triggerCharacters":[".",":","@"]},"documentHighlightProvider":false,"codeActionProvider":false,"workspace":{"workspaceFolders":{"supported":true}}}}}
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;
const not_implemented_response =
\\,"error":{"code":-32601,"message":"NotImplemented"}}
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;
const null_result_response =
\\,"result":null}
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;
const empty_result_response =
\\,"result":{}}
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;
const empty_array_response =
\\,"result":[]}
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;
const edit_not_applied_response =
\\,"result":{"applied":false,"failureReason":"feature not implemented"}}
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;
const no_completions_response =
\\,"result":{"isIncomplete":false,"items":[]}}
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;
/// Sends a request or response
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fn send(reqOrRes: var) !void {
// The most memory we'll probably need
var mem_buffer: [1024 * 128]u8 = undefined;
var fbs = std.io.fixedBufferStream(&mem_buffer);
try std.json.stringify(reqOrRes, std.json.StringifyOptions{}, fbs.outStream());
try stdout.print("Content-Length: {}\r\n\r\n", .{fbs.pos});
try stdout.writeAll(fbs.getWritten());
}
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fn log(comptime fmt: []const u8, args: var) !void {
// Disable logs on Release modes.
if (std.builtin.mode != .Debug) return;
var message = try std.fmt.allocPrint(allocator, fmt, args);
defer allocator.free(message);
try send(types.Notification{
.method = "window/logMessage",
.params = .{
.LogMessageParams = .{
.@"type" = .Log,
.message = message,
},
},
});
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}
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fn respondGeneric(id: i64, response: []const u8) !void {
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const id_digits = blk: {
if (id == 0) break :blk 1;
var digits: usize = 1;
var value = @divTrunc(id, 10);
while (value != 0) : (value = @divTrunc(value, 10)) {
digits += 1;
}
break :blk digits;
};
// Numbers of character that will be printed from this string: len - 3 brackets
// 1 from the beginning (escaped) and the 2 from the arg {}
const json_fmt = "{{\"jsonrpc\":\"2.0\",\"id\":{}";
try stdout.print("Content-Length: {}\r\n\r\n" ++ json_fmt, .{ response.len + id_digits + json_fmt.len - 3, id });
try stdout.writeAll(response);
}
// TODO: Is this correct or can we get a better end?
fn astLocationToRange(loc: std.zig.ast.Tree.Location) types.Range {
return .{
.start = .{
.line = @intCast(i64, loc.line),
.character = @intCast(i64, loc.column),
},
.end = .{
.line = @intCast(i64, loc.line),
.character = @intCast(i64, loc.column),
},
};
}
fn publishDiagnostics(handle: DocumentStore.Handle, config: Config) !void {
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const tree = try handle.tree(allocator);
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defer tree.deinit();
// Use an arena for our local memory allocations.
var arena = std.heap.ArenaAllocator.init(allocator);
defer arena.deinit();
var diagnostics = std.ArrayList(types.Diagnostic).init(&arena.allocator);
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var error_it = tree.errors.iterator(0);
while (error_it.next()) |err| {
const loc = tree.tokenLocation(0, err.loc());
var mem_buffer: [256]u8 = undefined;
var fbs = std.io.fixedBufferStream(&mem_buffer);
try tree.renderError(err, fbs.outStream());
try diagnostics.append(.{
.range = astLocationToRange(loc),
.severity = .Error,
.code = @tagName(err.*),
.source = "zls",
.message = try std.mem.dupe(&arena.allocator, u8, fbs.getWritten()),
// .relatedInformation = undefined
});
}
if (tree.errors.len == 0) {
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var decls = tree.root_node.decls.iterator(0);
while (decls.next()) |decl_ptr| {
var decl = decl_ptr.*;
switch (decl.id) {
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.FnProto => blk: {
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const func = decl.cast(std.zig.ast.Node.FnProto).?;
const is_extern = func.extern_export_inline_token != null;
if (is_extern)
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break :blk;
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if (config.warn_style) {
if (func.name_token) |name_token| {
const loc = tree.tokenLocation(0, name_token);
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const is_type_function = analysis.isTypeFunction(tree, func);
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const func_name = tree.tokenSlice(name_token);
if (!is_type_function and !analysis.isCamelCase(func_name)) {
try diagnostics.append(.{
.range = astLocationToRange(loc),
.severity = .Information,
.code = "BadStyle",
.source = "zls",
.message = "Functions should be camelCase",
});
} else if (is_type_function and !analysis.isPascalCase(func_name)) {
try diagnostics.append(.{
.range = astLocationToRange(loc),
.severity = .Information,
.code = "BadStyle",
.source = "zls",
.message = "Type functions should be PascalCase",
});
}
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}
}
},
else => {},
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}
}
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}
try send(types.Notification{
.method = "textDocument/publishDiagnostics",
.params = .{
.PublishDiagnosticsParams = .{
.uri = handle.uri(),
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.diagnostics = diagnostics.items,
},
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},
});
}
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fn containerToCompletion(list: *std.ArrayList(types.CompletionItem), tree: *std.zig.ast.Tree, container: *std.zig.ast.Node, config: Config) !void {
var index: usize = 0;
while (container.iterate(index)) |child_node| : (index+=1) {
if (analysis.isNodePublic(tree, child_node)) {
try nodeToCompletion(list, tree, child_node, config);
}
}
}
fn nodeToCompletion(list: *std.ArrayList(types.CompletionItem), tree: *std.zig.ast.Tree, node: *std.zig.ast.Node, config: Config) error{OutOfMemory}!void {
var doc = if (try analysis.getDocComments(list.allocator, tree, node)) |doc_comments|
types.MarkupContent{
.kind = .Markdown,
.value = doc_comments,
}
else
null;
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switch (node.id) {
.ErrorSetDecl, .Root, .ContainerDecl => {
try containerToCompletion(list, tree, node, config);
},
.FnProto => {
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const func = node.cast(std.zig.ast.Node.FnProto).?;
if (func.name_token) |name_token| {
const insert_text = if (config.enable_snippets)
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try analysis.getFunctionSnippet(list.allocator, tree, func)
else
null;
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const is_type_function = analysis.isTypeFunction(tree, func);
try list.append(.{
.label = tree.tokenSlice(name_token),
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.kind = if (is_type_function) .Struct else .Function,
.documentation = doc,
.detail = analysis.getFunctionSignature(tree, func),
.insertText = insert_text,
.insertTextFormat = if (config.enable_snippets) .Snippet else .PlainText,
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});
}
},
.VarDecl => {
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const var_decl = node.cast(std.zig.ast.Node.VarDecl).?;
const is_const = tree.tokens.at(var_decl.mut_token).id == .Keyword_const;
try list.append(.{
.label = tree.tokenSlice(var_decl.name_token),
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.kind = if (is_const) .Constant else .Variable,
.documentation = doc,
.detail = analysis.getVariableSignature(tree, var_decl),
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});
},
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.ParamDecl => {
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const param = node.cast(std.zig.ast.Node.ParamDecl).?;
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if (param.name_token) |name_token|
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try list.append(.{
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.label = tree.tokenSlice(name_token),
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.kind = .Constant,
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.documentation = doc,
.detail = analysis.getParamSignature(tree, param),
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});
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},
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.PrefixOp => {
try list.append(.{
.label = "len",
.kind = .Field,
});
try list.append(.{
.label = "ptr",
.kind = .Field,
});
},
.StringLiteral => {
try list.append(.{
.label = "len",
.kind = .Field,
});
},
else => if (analysis.nodeToString(tree, node)) |string| {
try list.append(.{
.label = string,
.kind = .Field,
.documentation = doc,
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});
},
}
}
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fn completeGlobal(id: i64, pos_index: usize, handle: DocumentStore.Handle, config: Config) !void {
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var tree = try handle.tree(allocator);
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defer tree.deinit();
// We use a local arena allocator to deallocate all temporary data without iterating
var arena = std.heap.ArenaAllocator.init(allocator);
var completions = std.ArrayList(types.CompletionItem).init(&arena.allocator);
// Deallocate all temporary data.
defer arena.deinit();
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// var decls = tree.root_node.decls.iterator(0);
var decls = try analysis.declsFromIndex(&arena.allocator, tree, pos_index);
for (decls) |decl_ptr| {
var decl = decl_ptr.*;
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try nodeToCompletion(&completions, tree, decl_ptr, config);
}
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try send(types.Response{
.id = .{ .Integer = id },
.result = .{
.CompletionList = .{
.isIncomplete = false,
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.items = completions.items,
},
},
});
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}
fn completeFieldAccess(id: i64, handle: *DocumentStore.Handle, position: types.Position, line_start_idx: usize, config: Config) !void {
var arena = std.heap.ArenaAllocator.init(allocator);
defer arena.deinit();
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var analysis_ctx = try document_store.analysisContext(handle, &arena, position);
defer analysis_ctx.deinit();
var completions = std.ArrayList(types.CompletionItem).init(&arena.allocator);
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const line = try handle.document.getLine(@intCast(usize, position.line));
var tokenizer = std.zig.Tokenizer.init(line[line_start_idx..]);
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// var decls = try analysis.declsFromIndex(&arena.allocator, analysis_ctx.tree, try handle.document.positionToIndex(position));
if (analysis.getFieldAccessTypeNode(&analysis_ctx, &tokenizer)) |node| {
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try nodeToCompletion(&completions, analysis_ctx.tree, node, config);
}
try send(types.Response{
.id = .{ .Integer = id },
.result = .{
.CompletionList = .{
.isIncomplete = false,
.items = completions.items,
},
},
});
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}
// Compute builtin completions at comptime.
const builtin_completions = block: {
@setEvalBranchQuota(3_500);
const CompletionList = [data.builtins.len]types.CompletionItem;
var with_snippets: CompletionList = undefined;
var without_snippets: CompletionList = undefined;
for (data.builtins) |builtin, i| {
const cutoff = std.mem.indexOf(u8, builtin, "(") orelse builtin.len;
const base_completion = types.CompletionItem{
.label = builtin[0..cutoff],
.kind = .Function,
.filterText = builtin[1..cutoff],
.detail = data.builtin_details[i],
.documentation = .{
.kind = .Markdown,
.value = data.builtin_docs[i],
},
};
with_snippets[i] = base_completion;
with_snippets[i].insertText = builtin[1..];
with_snippets[i].insertTextFormat = .Snippet;
without_snippets[i] = base_completion;
without_snippets[i].insertText = builtin[1..cutoff];
}
break :block [2]CompletionList{
without_snippets, with_snippets,
};
};
const PositionContext = union(enum) {
builtin,
comment,
string_literal,
field_access: usize,
var_access,
other,
empty,
};
const token_separators = [_]u8{
' ', '\t', '(', ')', '[', ']',
'{', '}', '|', '=', '!', ';',
',', '?', ':', '%', '+', '*',
'>', '<', '~', '-', '/', '&',
};
fn documentPositionContext(doc: types.TextDocument, pos_index: usize) PositionContext {
// First extract the whole current line up to the cursor.
var curr_position = pos_index;
while (curr_position > 0) : (curr_position -= 1) {
if (doc.text[curr_position - 1] == '\n') break;
}
var line = doc.text[curr_position .. pos_index + 1];
// Strip any leading whitespace.
var skipped_ws: usize = 0;
while (skipped_ws < line.len and (line[skipped_ws] == ' ' or line[skipped_ws] == '\t')) : (skipped_ws += 1) {}
if (skipped_ws >= line.len) return .empty;
line = line[skipped_ws..];
// Quick exit for comment lines and multi line string literals.
if (line.len >= 2 and line[0] == '/' and line[1] == '/')
return .comment;
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if (line.len >= 2 and line[0] == '\\' and line[1] == '\\')
return .string_literal;
// TODO: This does not detect if we are in a string literal over multiple lines.
// Find out what context we are in.
// Go over the current line character by character
// and determine the context.
curr_position = 0;
var expr_start: usize = skipped_ws;
var new_token = true;
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var context: PositionContext = .other;
var string_pop_ctx: PositionContext = .other;
while (curr_position < line.len) : (curr_position += 1) {
const c = line[curr_position];
const next_char = if (curr_position < line.len - 1) line[curr_position + 1] else null;
if (context != .string_literal and c == '"') {
expr_start = curr_position + skipped_ws;
context = .string_literal;
continue;
}
if (context == .string_literal) {
// Skip over escaped quotes
if (c == '\\' and next_char != null and next_char.? == '"') {
curr_position += 1;
} else if (c == '"') {
context = string_pop_ctx;
string_pop_ctx = .other;
new_token = true;
}
continue;
}
if (c == '/' and next_char != null and next_char.? == '/') {
context = .comment;
break;
}
if (std.mem.indexOfScalar(u8, &token_separators, c) != null) {
expr_start = curr_position + skipped_ws + 1;
new_token = true;
context = .other;
continue;
}
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if (c == '.' and (!new_token or context == .string_literal)) {
new_token = true;
if (next_char != null and next_char.? == '.') continue;
context = .{ .field_access = expr_start };
continue;
}
if (new_token) {
const access_ctx: PositionContext = if (context == .field_access)
.{ .field_access = expr_start }
else
.var_access;
new_token = false;
if (c == '_' or std.ascii.isAlpha(c)) {
context = access_ctx;
} else if (c == '@') {
// This checks for @"..." identifiers by controlling
// the context the string will set after it is over.
if (next_char != null and next_char.? == '"') {
string_pop_ctx = access_ctx;
}
context = .builtin;
} else {
context = .other;
}
continue;
}
if (context == .field_access or context == .var_access or context == .builtin) {
if (c != '_' and !std.ascii.isAlNum(c)) {
context = .other;
}
continue;
}
context = .other;
}
return context;
}
fn processJsonRpc(parser: *std.json.Parser, json: []const u8, config: Config) !void {
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var tree = try parser.parse(json);
defer tree.deinit();
const root = tree.root;
std.debug.assert(root.Object.getValue("method") != null);
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const method = root.Object.getValue("method").?.String;
const id = if (root.Object.getValue("id")) |id| id.Integer else 0;
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const params = root.Object.getValue("params").?.Object;
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// Core
if (std.mem.eql(u8, method, "initialize")) {
try respondGeneric(id, initialize_response);
} else if (std.mem.eql(u8, method, "initialized")) {
// noop
} else if (std.mem.eql(u8, method, "$/cancelRequest")) {
// noop
}
// File changes
else if (std.mem.eql(u8, method, "textDocument/didOpen")) {
const document = params.getValue("textDocument").?.Object;
const uri = document.getValue("uri").?.String;
const text = document.getValue("text").?.String;
const handle = try document_store.openDocument(uri, text);
try publishDiagnostics(handle.*, config);
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} else if (std.mem.eql(u8, method, "textDocument/didChange")) {
const text_document = params.getValue("textDocument").?.Object;
const uri = text_document.getValue("uri").?.String;
const content_changes = params.getValue("contentChanges").?.Array;
const handle = document_store.getHandle(uri) orelse {
try log("Trying to change non existent document {}", .{uri});
return;
};
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try document_store.applyChanges(handle, content_changes);
try publishDiagnostics(handle.*, config);
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} else if (std.mem.eql(u8, method, "textDocument/didSave")) {
// noop
} else if (std.mem.eql(u8, method, "textDocument/didClose")) {
const document = params.getValue("textDocument").?.Object;
const uri = document.getValue("uri").?.String;
document_store.closeDocument(uri);
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}
// Autocomplete / Signatures
else if (std.mem.eql(u8, method, "textDocument/completion")) {
const text_document = params.getValue("textDocument").?.Object;
const uri = text_document.getValue("uri").?.String;
const position = params.getValue("position").?.Object;
const handle = document_store.getHandle(uri) orelse {
try log("Trying to complete in non existent document {}", .{uri});
return;
};
const pos = types.Position{
.line = position.getValue("line").?.Integer,
.character = position.getValue("character").?.Integer - 1,
};
if (pos.character >= 0) {
const pos_index = try handle.document.positionToIndex(pos);
const pos_context = documentPositionContext(handle.document, pos_index);
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switch (pos_context) {
.builtin => try send(types.Response{
.id = .{ .Integer = id },
.result = .{
.CompletionList = .{
.isIncomplete = false,
.items = builtin_completions[@boolToInt(config.enable_snippets)][0..],
},
},
}),
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.var_access, .empty => try completeGlobal(id, pos_index, handle.*, config),
.field_access => |start_idx| try completeFieldAccess(id, handle, pos, start_idx, config),
else => try respondGeneric(id, no_completions_response),
}
} else {
try respondGeneric(id, no_completions_response);
}
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} else if (std.mem.eql(u8, method, "textDocument/signatureHelp")) {
// try respondGeneric(id,
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// \\,"result":{"signatures":[{
// \\"label": "nameOfFunction(aNumber: u8)",
// \\"documentation": {"kind": "markdown", "value": "Description of the function in **Markdown**!"},
// \\"parameters": [
// \\{"label": [15, 27], "documentation": {"kind": "markdown", "value": "An argument"}}
// \\]
// \\}]}}
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// );
try respondGeneric(id,
\\,"result":{"signatures":[]}}
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);
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} else if (root.Object.getValue("id")) |_| {
try log("Method with return value not implemented: {}", .{method});
try respondGeneric(id, not_implemented_response);
} else {
try log("Method without return value not implemented: {}", .{method});
}
}
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var debug_alloc_state: DebugAllocator = undefined;
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// We can now use if(leak_count_alloc) |alloc| { ... } as a comptime check.
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const debug_alloc: ?*DebugAllocator = if (build_options.allocation_info) &debug_alloc_state else null;
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pub fn main() anyerror!void {
// TODO: Use a better purpose general allocator once std has one.
// Probably after the generic composable allocators PR?
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// This is not too bad for now since most allocations happen in local arenas.
allocator = std.heap.page_allocator;
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if (build_options.allocation_info) {
// TODO: Use a better debugging allocator, track size in bytes, memory reserved etc..
// Initialize the leak counting allocator.
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debug_alloc_state = DebugAllocator.init(allocator);
allocator = &debug_alloc_state.allocator;
}
// Init buffer for stdin read
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var buffer = std.ArrayList(u8).init(allocator);
defer buffer.deinit();
try buffer.resize(4096);
// Init global vars
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var buffered_stdin = std.io.bufferedInStream(std.io.getStdIn().inStream());
const in_stream = buffered_stdin.inStream();
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stdout = std.io.getStdOut().outStream();
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// Read the configuration, if any.
const config_parse_options = std.json.ParseOptions{ .allocator = allocator };
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var config = Config{};
defer std.json.parseFree(Config, config, config_parse_options);
// TODO: Investigate using std.fs.Watch to detect writes to the config and reload it.
config_read: {
var exec_dir_bytes: [std.fs.MAX_PATH_BYTES]u8 = undefined;
const exec_dir_path = std.fs.selfExeDirPath(&exec_dir_bytes) catch break :config_read;
var exec_dir = std.fs.cwd().openDir(exec_dir_path, .{}) catch break :config_read;
defer exec_dir.close();
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const conf_file = exec_dir.openFile("zls.json", .{}) catch break :config_read;
defer conf_file.close();
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// Max 1MB
const file_buf = conf_file.inStream().readAllAlloc(allocator, 0x1000000) catch break :config_read;
defer allocator.free(file_buf);
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// TODO: Better errors? Doesn't seem like std.json can provide us positions or context.
config = std.json.parse(Config, &std.json.TokenStream.init(file_buf), config_parse_options) catch |err| {
std.debug.warn("Error while parsing configuration file: {}\nUsing default config.\n", .{err});
break :config_read;
};
}
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if (config.zig_lib_path) |zig_lib_path| {
if (!std.fs.path.isAbsolute(zig_lib_path)) {
std.debug.warn("zig library path is not absolute, defaulting to null.\n", .{});
allocator.free(zig_lib_path);
config.zig_lib_path = null;
}
}
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try document_store.init(allocator, config.zig_lib_path);
defer document_store.deinit();
// This JSON parser is passed to processJsonRpc and reset.
var json_parser = std.json.Parser.init(allocator, false);
defer json_parser.deinit();
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while (true) {
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const headers = readRequestHeader(allocator, in_stream) catch |err| {
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try log("{}; exiting!", .{@errorName(err)});
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return;
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};
defer headers.deinit(allocator);
const buf = try allocator.alloc(u8, headers.content_length);
defer allocator.free(buf);
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try in_stream.readNoEof(buf);
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try processJsonRpc(&json_parser, buf, config);
json_parser.reset();
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if (debug_alloc) |dbg| {
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try log("{}", .{dbg.info});
}
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}
}