solc: Adds language server support via --lsp CLI option.

Author: christianparpart

libsolidity/CMakeLists.txt

@@ -149,6 +149,12 @@ set(sources
 	interface/StorageLayout.h
 	interface/Version.cpp
 	interface/Version.h
+	lsp/LanguageServer.cpp
+	lsp/LanguageServer.h
+	lsp/ReferenceCollector.cpp
+	lsp/ReferenceCollector.h
+	lsp/Transport.cpp
+	lsp/Transport.h
 	parsing/DocStringParser.cpp
 	parsing/DocStringParser.h
 	parsing/Parser.cpp

libsolidity/interface/FileReader.cpp

@@ -73,7 +73,7 @@ ReadCallback::Result FileReader::readFile(string const& _kind, string const& _so
 			return ReadCallback::Result{false, "File outside of allowed directories."};
 
 		if (!boost::filesystem::exists(canonicalPath))
-			return ReadCallback::Result{false, "File not found."};
+			return ReadCallback::Result{false, "File not found: " + canonicalPath.generic_string()};
 
 		if (!boost::filesystem::is_regular_file(canonicalPath))
 			return ReadCallback::Result{false, "Not a valid file."};

libsolidity/lsp/LSPTypes.h

@@ -0,0 +1,74 @@
+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+// SPDX-License-Identifier: GPL-3.0
+#pragma once
+
+#include <liblangutil/SourceLocation.h>
+#include <liblangutil/SourceReferenceExtractor.h> // LineColumn
+
+#include <optional>
+#include <ostream>
+#include <string>
+#include <vector>
+
+namespace solidity::lsp
+{
+
+struct LineColumnRange
+{
+	langutil::LineColumn start;
+	langutil::LineColumn end;
+};
+
+enum class Trace { Off, Messages, Verbose };
+
+struct DocumentPosition {
+	std::string path;
+	langutil::LineColumn position;
+};
+
+enum class DocumentHighlightKind {
+	Unspecified,
+	Text,           //!< a textual occurrence
+	Read,           //!< read access to a variable
+	Write,          //!< write access to a variable
+};
+
+// Represents a symbol / AST node that is to be highlighted, with some context associated.
+struct DocumentHighlight {
+	langutil::SourceLocation location;
+	// std::string sourceName;
+	// LineColumnRange range;
+	DocumentHighlightKind kind = DocumentHighlightKind::Unspecified;
+};
+
+enum class DiagnosticSeverity {
+	Error = 1,
+	Warning = 2,
+	Information = 3,
+	Hint = 4,
+};
+
+/// Represents a related message and source code location for a diagnostic. This should be
+/// used to point to code locations that cause or related to a diagnostics, e.g when duplicating
+/// a symbol in a scope.
+struct DiagnosticRelatedInformation {
+	langutil::SourceLocation location;   // The location of this related diagnostic information.
+	std::string message; // The message of this related diagnostic information.
+};
+
+}