lsp: Adds support for include paths and have {projectUri}/node_module…

…s added by default.

- Factor out FileRepository's path resolving into own public function.
- Fixes sourceUnitNameToUri() path resolving in relation to include paths being used.
- Adding an solAssert().
- adds nother test for include-paths (bad include)
- Fixes a case on Windows there an ill-formed URI was generated.
- Dropping unnecessary if-branch when translating from sourceUnitName to URI.

Changelog.md

@@ -30,7 +30,8 @@ Compiler Features:
  * LSP: Add rudimentary support for semantic highlighting.
  * Type Checker: Warn about assignments involving multiple pushes to storage ``bytes`` that may invalidate references.
  * Yul Optimizer: Improve inlining heuristics for via IR code generation and pure Yul compilation.
-
+ * Language Server: Always add ``{project_root}/node_modules`` to include search paths.
+ * Language Server: Adds support for configuring ``include-paths`` JSON settings object that can be passed during LSP configuration stage.
 
 Bugfixes:
  * ABI Encoder: When encoding an empty string coming from storage do not add a superfluous empty slot for data.

libsolidity/lsp/FileRepository.cpp

@@ -22,37 +22,64 @@
 #include <libsolutil/StringUtils.h>
 #include <libsolutil/CommonIO.h>
 
+#include <range/v3/algorithm/none_of.hpp>
 #include <range/v3/range/conversion.hpp>
 #include <range/v3/view/transform.hpp>
 
 #include <regex>
 
+#include <boost/algorithm/string/predicate.hpp>
+
 using namespace std;
 using namespace solidity;
 using namespace solidity::lsp;
 using namespace solidity::frontend;
 
 using solidity::util::readFileAsString;
 using solidity::util::joinHumanReadable;
+using solidity::util::Result;
 
-FileRepository::FileRepository(boost::filesystem::path _basePath): m_basePath(std::move(_basePath))
+FileRepository::FileRepository(boost::filesystem::path _basePath, std::vector<boost::filesystem::path> _includePaths):
+	m_basePath(std::move(_basePath)),
+	m_includePaths(std::move(_includePaths))
 {
 }
 
+void FileRepository::setIncludePaths(std::vector<boost::filesystem::path> _paths)
+{
+	m_includePaths = std::move(_paths);
+}
+
 string FileRepository::sourceUnitNameToUri(string const& _sourceUnitName) const
 {
 	regex const windowsDriveLetterPath("^[a-zA-Z]:/");
 
+	auto const ensurePathIsUnixLike = [&](string inputPath) -> string {
+		if (!regex_search(inputPath, windowsDriveLetterPath))
+			return inputPath;
+		else
+			return "/" + move(inputPath);
+	};
+
 	if (m_sourceUnitNamesToUri.count(_sourceUnitName))
+	{
+		solAssert(boost::starts_with(m_sourceUnitNamesToUri.at(_sourceUnitName), "file://"), "");
 		return m_sourceUnitNamesToUri.at(_sourceUnitName);
+	}
 	else if (_sourceUnitName.find("file://") == 0)
 		return _sourceUnitName;
 	else if (regex_search(_sourceUnitName, windowsDriveLetterPath))
 		return "file:///" + _sourceUnitName;
-	else if (_sourceUnitName.find("/") == 0)
-		return "file://" + _sourceUnitName;
-	else
+	else if (
+		auto const resolvedPath = tryResolvePath(_sourceUnitName);
+		resolvedPath.message().empty()
+	)
+		return "file://" + ensurePathIsUnixLike(resolvedPath.get().generic_string());
+	else if (m_basePath.generic_string() != "/")
 		return "file://" + m_basePath.generic_string() + "/" + _sourceUnitName;
+	else
+		// Avoid double-/ in case base-path itself is simply a UNIX root filesystem root.
+		return "file:///" + _sourceUnitName;
 }
 
 string FileRepository::uriToSourceUnitName(string const& _path) const
@@ -69,6 +96,52 @@ void FileRepository::setSourceByUri(string const& _uri, string _source)
 	m_sourceCodes[sourceUnitName] = std::move(_source);
 }
 
+Result<boost::filesystem::path> FileRepository::tryResolvePath(std::string const& _strippedSourceUnitName) const
+{
+	if (
+		boost::filesystem::path(_strippedSourceUnitName).has_root_path() &&
+		boost::filesystem::exists(_strippedSourceUnitName)
+	)
+		return boost::filesystem::path(_strippedSourceUnitName);
+
+	vector<boost::filesystem::path> candidates;
+	vector<reference_wrapper<boost::filesystem::path const>> prefixes = {m_basePath};
+	prefixes += (m_includePaths | ranges::to<vector<reference_wrapper<boost::filesystem::path const>>>);
+	auto const defaultInclude = m_basePath / "node_modules";
+	if (m_includePaths.empty())
+		prefixes.emplace_back(defaultInclude);
+
+	auto const pathToQuotedString = [](boost::filesystem::path const& _path) { return "\"" + _path.string() + "\""; };
+
+	for (auto const& prefix: prefixes)
+	{
+		boost::filesystem::path canonicalPath = boost::filesystem::path(prefix) / boost::filesystem::path(_strippedSourceUnitName);
+
+		if (boost::filesystem::exists(canonicalPath))
+			candidates.push_back(move(canonicalPath));
+	}
+
+	if (candidates.empty())
+		return Result<boost::filesystem::path>::err(
+			"File not found. Searched the following locations: " +
+			joinHumanReadable(prefixes | ranges::views::transform(pathToQuotedString), ", ") +
+			"."
+		);
+
+	if (candidates.size() >= 2)
+		return Result<boost::filesystem::path>::err(
+			"Ambiguous import. "
+			"Multiple matching files found inside base path and/or include paths: " +
+			joinHumanReadable(candidates | ranges::views::transform(pathToQuotedString), ", ") +
+			"."
+		);
+
+	if (!boost::filesystem::is_regular_file(candidates[0]))
+		return Result<boost::filesystem::path>::err("Not a valid file.");
+
+	return candidates[0];
+}
+
 frontend::ReadCallback::Result FileRepository::readFile(string const& _kind, string const& _sourceUnitName)
 {
 	solAssert(
@@ -83,53 +156,11 @@ frontend::ReadCallback::Result FileRepository::readFile(string const& _kind, str
 			return ReadCallback::Result{true, m_sourceCodes.at(_sourceUnitName)};
 
 		string const strippedSourceUnitName = stripFileUriSchemePrefix(_sourceUnitName);
+		Result<boost::filesystem::path> const resolvedPath = tryResolvePath(strippedSourceUnitName);
+		if (!resolvedPath.message().empty())
+			return ReadCallback::Result{false, resolvedPath.message()};
 
-		if (
-			boost::filesystem::path(strippedSourceUnitName).has_root_path() &&
-			boost::filesystem::exists(strippedSourceUnitName)
-		)
-		{
-			auto contents = readFileAsString(strippedSourceUnitName);
-			solAssert(m_sourceCodes.count(_sourceUnitName) == 0, "");
-			m_sourceCodes[_sourceUnitName] = contents;
-			return ReadCallback::Result{true, move(contents)};
-		}
-
-		vector<boost::filesystem::path> candidates;
-		vector<reference_wrapper<boost::filesystem::path>> prefixes = {m_basePath};
-		prefixes += (m_includePaths | ranges::to<vector<reference_wrapper<boost::filesystem::path>>>);
-
-		auto const pathToQuotedString = [](boost::filesystem::path const& _path) { return "\"" + _path.string() + "\""; };
-
-		for (auto const& prefix: prefixes)
-		{
-			boost::filesystem::path canonicalPath = boost::filesystem::path(prefix) / boost::filesystem::path(strippedSourceUnitName);
-
-			if (boost::filesystem::exists(canonicalPath))
-				candidates.push_back(move(canonicalPath));
-		}
-
-		if (candidates.empty())
-			return ReadCallback::Result{
-				false,
-				"File not found. Searched the following locations: " +
-				joinHumanReadable(prefixes | ranges::views::transform(pathToQuotedString), ", ") +
-				"."
-			};
-
-		if (candidates.size() >= 2)
-			return ReadCallback::Result{
-				false,
-				"Ambiguous import. "
-				"Multiple matching files found inside base path and/or include paths: " +
-				joinHumanReadable(candidates | ranges::views::transform(pathToQuotedString), ", ") +
-				"."
-			};
-
-		if (!boost::filesystem::is_regular_file(candidates[0]))
-			return ReadCallback::Result{false, "Not a valid file."};
-
-		auto contents = readFileAsString(candidates[0]);
+		auto contents = readFileAsString(resolvedPath.get());
 		solAssert(m_sourceCodes.count(_sourceUnitName) == 0, "");
 		m_sourceCodes[_sourceUnitName] = contents;
 		return ReadCallback::Result{true, move(contents)};

libsolidity/lsp/FileRepository.h

@@ -18,6 +18,7 @@
 #pragma once
 
 #include <libsolidity/interface/FileReader.h>
+#include <libsolutil/Result.h>
 
 #include <string>
 #include <map>
@@ -28,7 +29,10 @@ namespace solidity::lsp
 class FileRepository
 {
 public:
-	explicit FileRepository(boost::filesystem::path _basePath);
+	FileRepository(boost::filesystem::path _basePath, std::vector<boost::filesystem::path> _includePaths);
+
+	std::vector<boost::filesystem::path> const& includePaths() const noexcept { return m_includePaths; }
+	void setIncludePaths(std::vector<boost::filesystem::path> _paths);
 
 	boost::filesystem::path const& basePath() const { return m_basePath; }
 
@@ -51,6 +55,8 @@ class FileRepository
 		return [this](std::string const& _kind, std::string const& _path) { return readFile(_kind, _path); };
 	}
 
+	util::Result<boost::filesystem::path> tryResolvePath(std::string const& _sourceUnitName) const;
+
 private:
 	/// Base path without URI scheme.
 	boost::filesystem::path m_basePath;

libsolidity/lsp/LanguageServer.cpp

@@ -130,7 +130,7 @@ LanguageServer::LanguageServer(Transport& _transport):
 		{"textDocument/semanticTokens/full", bind(&LanguageServer::semanticTokensFull, this, _1, _2)},
 		{"workspace/didChangeConfiguration", bind(&LanguageServer::handleWorkspaceDidChangeConfiguration, this, _2)},
 	},
-	m_fileRepository("/" /* basePath */),
+	m_fileRepository("/" /* basePath */, {} /* no search paths */),
 	m_compilerStack{m_fileRepository.reader()}
 {
 }
@@ -148,14 +148,34 @@ Json::Value LanguageServer::toJson(SourceLocation const& _location)
 void LanguageServer::changeConfiguration(Json::Value const& _settings)
 {
 	m_settingsObject = _settings;
+	Json::Value jsonIncludePaths = _settings["include-paths"];
+	int typeFailureCount = 0;
+
+	if (jsonIncludePaths && jsonIncludePaths.isArray())
+	{
+		vector<boost::filesystem::path> includePaths;
+		for (Json::Value const& jsonPath: jsonIncludePaths)
+		{
+			if (jsonPath.isString())
+				includePaths.emplace_back(boost::filesystem::path(jsonPath.asString()));
+			else
+				typeFailureCount++;
+		}
+		m_fileRepository.setIncludePaths(move(includePaths));
+	}
+	else
+		++typeFailureCount;
+
+	if (typeFailureCount)
+		m_client.trace("Invalid JSON configuration passed. \"include-paths\" must be an array of strings.");
 }
 
 void LanguageServer::compile()
 {
 	// For files that are not open, we have to take changes on disk into account,
 	// so we just remove all non-open files.
 
-	FileRepository oldRepository(m_fileRepository.basePath());
+	FileRepository oldRepository(m_fileRepository.basePath(), m_fileRepository.includePaths());
 	swap(oldRepository, m_fileRepository);
 
 	for (string const& fileName: m_openFiles)
@@ -302,7 +322,7 @@ void LanguageServer::handleInitialize(MessageID _id, Json::Value const& _args)
 	else if (Json::Value rootPath = _args["rootPath"])
 		rootPath = rootPath.asString();
 
-	m_fileRepository = FileRepository(rootPath);
+	m_fileRepository = FileRepository(rootPath, {});
 	if (_args["initializationOptions"].isObject())
 		changeConfiguration(_args["initializationOptions"]);
 

test/libsolidity/lsp/include-paths/default_include.sol

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity >=0.8.0;
+
+import "my-module/test.sol";
+
+contract MyContract
+{
+    function f(uint a, uint b) public pure returns (uint)
+    {
+        return MyModule.add(a, b);
+    }
+}
+// ----
+// test:

test/libsolidity/lsp/include-paths/file_at_include_path.sol

@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity >=0.8.0;
+
+import "rootlib.sol";
+
+contract MyContract
+{
+}
+// ----
+// rootlib:

test/libsolidity/lsp/include-paths/file_not_found_in_searchpath.sol

@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity >=0.8.0;
+
+   import "test.sol";
+// ^^^^^^^^^^^^^^^^^^ @IncludeLocation
+
+contract SomeContract
+{
+}
+// ----
+// file_not_found_in_searchpath: @IncludeLocation 6275

test/lsp.py

@@ -1450,7 +1450,7 @@ def test_generic(self, solc: JsonRpcProcess) -> None:
         self.setup_lsp(solc)
 
         sub_dirs = filter(
-            lambda filepath: filepath.is_dir(),
+            lambda filepath: filepath.is_dir() and filepath.name != 'node_modules',
             os.scandir(self.project_root_dir)
         )