From a0394a1bfadb93b1f697b43bf52750bbff02af37 Mon Sep 17 00:00:00 2001
From: Alex Beregszaszi <alex@rtfs.hu>
Date: Fri, 29 Sep 2017 19:05:39 +0100
Subject: [PATCH] Restrict contracts compiled via outputSelection (but not the
 individual output details)

---
 Changelog.md                               |   1 +
 libsolidity/interface/StandardCompiler.cpp |  19 ++++
 test/libsolidity/StandardCompiler.cpp      | 116 +++++++++++++++++++++
 3 files changed, 136 insertions(+)

diff --git a/Changelog.md b/Changelog.md
index 8ebc30d05..6f2f40fbc 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -2,6 +2,7 @@
 
 Features:
  * Parser: Better error message for unexpected trailing comma in parameter lists.
+ * Standard JSON: Support the ``outputSelection`` field for selective compilation of supplied sources.
  * Syntax Checker: Unary ``+`` is now a syntax error as experimental 0.5.0 feature.
  * Type Checker: Disallow non-pure constant state variables as experimental 0.5.0 feature.
 
diff --git a/libsolidity/interface/StandardCompiler.cpp b/libsolidity/interface/StandardCompiler.cpp
index b4fbbef9b..430739acc 100644
--- a/libsolidity/interface/StandardCompiler.cpp
+++ b/libsolidity/interface/StandardCompiler.cpp
@@ -92,6 +92,22 @@ Json::Value formatErrorWithException(
 	return formatError(_warning, _type, _component, message, formattedMessage, location);
 }
 
+set<string> requestedContractNames(Json::Value const& _outputSelection)
+{
+	set<string> names;
+	for (auto const& sourceName: _outputSelection.getMemberNames())
+	{
+		for (auto const& contractName: _outputSelection[sourceName].getMemberNames())
+		{
+			/// Consider the "all sources" shortcuts as requesting everything.
+			if (contractName == "*" || contractName == "")
+				return set<string>();
+			names.insert((sourceName == "*" ? "" : sourceName) + ":" + contractName);
+		}
+	}
+	return names;
+}
+
 /// Returns true iff @a _hash (hex with 0x prefix) is the Keccak256 hash of the binary data in @a _content.
 bool hashMatchesContent(string const& _hash, string const& _content)
 {
@@ -265,6 +281,9 @@ Json::Value StandardCompiler::compileInternal(Json::Value const& _input)
 	Json::Value metadataSettings = settings.get("metadata", Json::Value());
 	m_compilerStack.useMetadataLiteralSources(metadataSettings.get("useLiteralContent", Json::Value(false)).asBool());
 
+	Json::Value outputSelection = settings.get("outputSelection", Json::Value());
+	m_compilerStack.setRequestedContractNames(requestedContractNames(outputSelection));
+
 	auto scannerFromSourceName = [&](string const& _sourceName) -> solidity::Scanner const& { return m_compilerStack.scanner(_sourceName); };
 
 	try
diff --git a/test/libsolidity/StandardCompiler.cpp b/test/libsolidity/StandardCompiler.cpp
index 24f915c07..03d7f85af 100644
--- a/test/libsolidity/StandardCompiler.cpp
+++ b/test/libsolidity/StandardCompiler.cpp
@@ -226,6 +226,122 @@ BOOST_AUTO_TEST_CASE(basic_compilation)
 	);
 }
 
+BOOST_AUTO_TEST_CASE(output_selection_explicit)
+{
+	char const* input = R"(
+	{
+		"language": "Solidity",
+		"settings": {
+			"outputSelection": {
+				"fileA": {
+					"A": [
+						"abi"
+					]
+				}
+			}
+		},
+		"sources": {
+			"fileA": {
+				"content": "contract A { }"
+			}
+		}
+	}
+	)";
+	Json::Value result = compile(input);
+	BOOST_CHECK(containsAtMostWarnings(result));
+	Json::Value contract = getContractResult(result, "fileA", "A");
+	BOOST_CHECK(contract.isObject());
+	BOOST_CHECK(contract["abi"].isArray());
+	BOOST_CHECK_EQUAL(dev::jsonCompactPrint(contract["abi"]), "[]");
+}
+
+BOOST_AUTO_TEST_CASE(output_selection_all_contracts)
+{
+	char const* input = R"(
+	{
+		"language": "Solidity",
+		"settings": {
+			"outputSelection": {
+				"fileA": {
+					"*": [
+						"abi"
+					]
+				}
+			}
+		},
+		"sources": {
+			"fileA": {
+				"content": "contract A { }"
+			}
+		}
+	}
+	)";
+	Json::Value result = compile(input);
+	BOOST_CHECK(containsAtMostWarnings(result));
+	Json::Value contract = getContractResult(result, "fileA", "A");
+	BOOST_CHECK(contract.isObject());
+	BOOST_CHECK(contract["abi"].isArray());
+	BOOST_CHECK_EQUAL(dev::jsonCompactPrint(contract["abi"]), "[]");
+}
+
+BOOST_AUTO_TEST_CASE(output_selection_all_files_single_contract)
+{
+	char const* input = R"(
+	{
+		"language": "Solidity",
+		"settings": {
+			"outputSelection": {
+				"*": {
+					"A": [
+						"abi"
+					]
+				}
+			}
+		},
+		"sources": {
+			"fileA": {
+				"content": "contract A { }"
+			}
+		}
+	}
+	)";
+	Json::Value result = compile(input);
+	BOOST_CHECK(containsAtMostWarnings(result));
+	Json::Value contract = getContractResult(result, "fileA", "A");
+	BOOST_CHECK(contract.isObject());
+	BOOST_CHECK(contract["abi"].isArray());
+	BOOST_CHECK_EQUAL(dev::jsonCompactPrint(contract["abi"]), "[]");
+}
+
+BOOST_AUTO_TEST_CASE(output_selection_all_files_all_contracts)
+{
+	char const* input = R"(
+	{
+		"language": "Solidity",
+		"settings": {
+			"outputSelection": {
+				"*": {
+					"*": [
+						"abi"
+					]
+				}
+			}
+		},
+		"sources": {
+			"fileA": {
+				"content": "contract A { }"
+			}
+		}
+	}
+	)";
+	Json::Value result = compile(input);
+	BOOST_CHECK(containsAtMostWarnings(result));
+	Json::Value contract = getContractResult(result, "fileA", "A");
+	BOOST_CHECK(contract.isObject());
+	BOOST_CHECK(contract["abi"].isArray());
+	BOOST_CHECK_EQUAL(dev::jsonCompactPrint(contract["abi"]), "[]");
+}
+
 BOOST_AUTO_TEST_SUITE_END()
 
 }