path: root/libsolidity/ast/ASTJsonConverter.cpp

/*
    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/>.
*/
/**
 * @author Lefteris <lefteris@ethdev.com>
 * @date 2015
 * Converts the AST into json format
 */

#include <libsolidity/ast/ASTJsonConverter.h>
#include <boost/algorithm/string/join.hpp>
#include <libdevcore/UTF8.h>
#include <libsolidity/ast/AST.h>
#include <libsolidity/interface/Exceptions.h>
#include <libsolidity/inlineasm/AsmData.h>
#include <libsolidity/inlineasm/AsmPrinter.h>

using namespace std;

namespace dev
{
namespace solidity
{

ASTJsonConverter::ASTJsonConverter(bool _legacy, map<string, unsigned> _sourceIndices):
    m_legacy(_legacy),
    m_sourceIndices(_sourceIndices)
{
}


void ASTJsonConverter::setJsonNode(
    ASTNode const& _node,
    string const& _nodeName,
    initializer_list<pair<string, Json::Value>>&& _attributes
)
{
    ASTJsonConverter::setJsonNode(
        _node,
        _nodeName,
        std::vector<pair<string, Json::Value>>(std::move(_attributes))
    );
}

void ASTJsonConverter::setJsonNode(
    ASTNode const& _node,
    string const& _nodeType,
    std::vector<pair<string, Json::Value>>&& _attributes
)
{
    m_currentValue = Json::objectValue;
    m_currentValue["id"] = nodeId(_node);
    m_currentValue["src"] = sourceLocationToString(_node.location());
    if (!m_legacy)
    {
        m_currentValue["nodeType"] = _nodeType;
        for (auto& e: _attributes)
            m_currentValue[e.first] = std::move(e.second);
    }
    else
    {
        m_currentValue["name"] = _nodeType;
        Json::Value attrs(Json::objectValue);
        if (
            //these nodeTypes need to have a children-node even if it is empty
            (_nodeType == "VariableDeclaration") ||
            (_nodeType == "ParameterList") ||
            (_nodeType == "Block") ||
            (_nodeType == "InlineAssembly") ||
            (_nodeType == "Throw")
        )
        {
            Json::Value children(Json::arrayValue);
            m_currentValue["children"] = children;
        }

        for (auto& e: _attributes)
        {
            if (
                (!e.second.isNull()) &&
                    (
                    (e.second.isObject() && e.second.isMember("name")) ||
                    (e.second.isArray() && e.second[0].isObject() && e.second[0].isMember("name")) ||
                    (e.first == "declarations") // (in the case (_,x)= ... there's a nullpointer at [0]
                    )
            )
            {
                if (e.second.isObject())
                    m_currentValue["children"].append(std::move(e.second));
                if (e.second.isArray())
                    for (auto& child: e.second)
                        if (!child.isNull())
                            m_currentValue["children"].append(std::move(child));
            }
            else
            {
                if (e.first == "typeDescriptions")
                    attrs["type"] = Json::Value(e.second["typeString"]);
                else
                    attrs[e.first] = std::move(e.second);
            }
        }
        if (!attrs.empty())
            m_currentValue["attributes"] = std::move(attrs);
    }
}

string ASTJsonConverter::sourceLocationToString(SourceLocation const& _location) const
{
    int sourceIndex{-1};
    if (_location.sourceName && m_sourceIndices.count(*_location.sourceName))
        sourceIndex = m_sourceIndices.at(*_location.sourceName);
    int length = -1;
    if (_location.start >= 0 && _location.end >= 0)
        length = _location.end - _location.start;
    return std::to_string(_location.start) + ":" + std::to_string(length) + ":" + std::to_string(sourceIndex);
}

string ASTJsonConverter::namePathToString(std::vector<ASTString> const& _namePath) const
{
    return boost::algorithm::join(_namePath, ".");
}

Json::Value ASTJsonConverter::typePointerToJson(TypePointer _tp)
{
    Json::Value typeDescriptions(Json::objectValue);
    typeDescriptions["typeString"] = _tp ? Json::Value(_tp->toString()) : Json::nullValue;
    typeDescriptions["typeIdentifier"] = _tp ? Json::Value(_tp->identifier()) : Json::nullValue;
    return typeDescriptions;

}
Json::Value ASTJsonConverter::typePointerToJson(std::shared_ptr<std::vector<TypePointer>> _tps)
{
    if (_tps)
    {
        Json::Value arguments(Json::arrayValue);
        for (auto const& tp: *_tps)
            arguments.append(typePointerToJson(tp));
        return arguments;
    }
    else
        return Json::nullValue;
}

void ASTJsonConverter::appendExpressionAttributes(
    std::vector<pair<string, Json::Value>>& _attributes,
    ExpressionAnnotation const& _annotation
)
{
    std::vector<pair<string, Json::Value>> exprAttributes = {
        make_pair("typeDescriptions", typePointerToJson(_annotation.type)),
        make_pair("isConstant", _annotation.isConstant),
        make_pair("isPure", _annotation.isPure),
        make_pair("isLValue", _annotation.isLValue),
        make_pair("lValueRequested", _annotation.lValueRequested),
        make_pair("argumentTypes", typePointerToJson(_annotation.argumentTypes))
    };
    _attributes += exprAttributes;
}

Json::Value ASTJsonConverter::inlineAssemblyIdentifierToJson(pair<assembly::Identifier const* ,InlineAssemblyAnnotation::ExternalIdentifierInfo> _info)
{
    Json::Value tuple(Json::objectValue);
    tuple["src"] = sourceLocationToString(_info.first->location);
    tuple["declaration"] = idOrNull(_info.second.declaration);
    tuple["isSlot"] = Json::Value(_info.second.isSlot);
    tuple["isOffset"] = Json::Value(_info.second.isOffset);
    tuple["valueSize"] = _info.second.valueSize;
    return tuple;
}

void ASTJsonConverter::print(ostream& _stream, ASTNode const& _node)
{
    _stream << toJson(_node);
}

Json::Value ASTJsonConverter::toJson(ASTNode const& _node)
{
    _node.accept(*this);
    return std::move(m_currentValue);
}

bool ASTJsonConverter::visit(SourceUnit const& _node)
{
    Json::Value exportedSymbols = Json::objectValue;
    for (auto const& sym: _node.annotation().exportedSymbols)
    {
        exportedSymbols[sym.first] = Json::arrayValue;
        for (Declaration const* overload: sym.second)
            exportedSymbols[sym.first].append(nodeId(*overload));
    }
    setJsonNode(
        _node,
        "SourceUnit",
        {
            make_pair("absolutePath", _node.annotation().path),
            make_pair("exportedSymbols", move(exportedSymbols)),
            make_pair("nodes", toJson(_node.nodes()))
        }
    );
    return false;
}

bool ASTJsonConverter::visit(PragmaDirective const& _node)
{
    Json::Value literals(Json::arrayValue);
    for (auto const& literal: _node.literals())
        literals.append(literal);
    setJsonNode( _node, "PragmaDirective", {
        make_pair("literals", std::move(literals))
    });
    return false;
}

bool ASTJsonConverter::visit(ImportDirective const& _node)
{
    std::vector<pair<string, Json::Value>> attributes = {
        make_pair("file", _node.path()),
        make_pair("absolutePath", _node.annotation().absolutePath),
        make_pair(m_legacy ? "SourceUnit" : "sourceUnit", nodeId(*_node.annotation().sourceUnit)),
        make_pair("scope", idOrNull(_node.scope()))
    };
    attributes.push_back(make_pair("unitAlias", _node.name()));
    Json::Value symbolAliases(Json::arrayValue);
    for (auto const& symbolAlias: _node.symbolAliases())
    {
        Json::Value tuple(Json::objectValue);
        solAssert(symbolAlias.first, "");
        tuple["foreign"] = nodeId(*symbolAlias.first);
        tuple["local"] =  symbolAlias.second ? Json::Value(*symbolAlias.second) : Json::nullValue;
        symbolAliases.append(tuple);
    }
    attributes.push_back(make_pair("symbolAliases", std::move(symbolAliases)));
    setJsonNode(_node, "ImportDirective", std::move(attributes));
    return false;
}

bool ASTJsonConverter::visit(ContractDefinition const& _node)
{
    setJsonNode(_node, "ContractDefinition", {
        make_pair("name", _node.name()),
        make_pair("contractKind", contractKind(_node.contractKind())),
        make_pair("fullyImplemented", _node.annotation().isFullyImplemented),
        make_pair("linearizedBaseContracts", getContainerIds(_node.annotation().linearizedBaseContracts)),
        make_pair("baseContracts", toJson(_node.baseContracts())),
        make_pair("contractDependencies", getContainerIds(_node.annotation().contractDependencies)),
        make_pair("nodes", toJson(_node.subNodes())),
        make_pair("scope", idOrNull(_node.scope()))
    });
    return false;
}

bool ASTJsonConverter::visit(InheritanceSpecifier const& _node)
{
    setJsonNode(_node, "InheritanceSpecifier", {
        make_pair("baseName", toJson(_node.name())),
        make_pair("arguments", toJson(_node.arguments()))
    });
    return false;
}

bool ASTJsonConverter::visit(UsingForDirective const& _node)
{
    setJsonNode(_node, "UsingForDirective", {
        make_pair("libraryName", toJson(_node.libraryName())),
        make_pair("typeName", _node.typeName() ? toJson(*_node.typeName()) : Json::nullValue)
    });
    return false;
}

bool ASTJsonConverter::visit(StructDefinition const& _node)
{
    setJsonNode(_node, "StructDefinition", {
        make_pair("name", _node.name()),
        make_pair("visibility", visibility(_node.visibility())),
        make_pair("canonicalName", _node.annotation().canonicalName),
        make_pair("members", toJson(_node.members())),
        make_pair("scope", idOrNull(_node.scope()))
    });
    return false;
}

bool ASTJsonConverter::visit(EnumDefinition const& _node)
{
    setJsonNode(_node, "EnumDefinition", {
        make_pair("name", _node.name()),
        make_pair("canonicalName", _node.annotation().canonicalName),
        make_pair("members", toJson(_node.members()))
    });
    return false;
}

bool ASTJsonConverter::visit(EnumValue const& _node)
{
    setJsonNode(_node, "EnumValue", {
        make_pair("name", _node.name())
    });
    return false;
}

bool ASTJsonConverter::visit(ParameterList const& _node)
{
    setJsonNode(_node, "ParameterList", {
        make_pair("parameters", toJson(_node.parameters()))
    });
    return false;
}

bool ASTJsonConverter::visit(FunctionDefinition const& _node)
{
    std::vector<pair<string, Json::Value>> attributes = {
        make_pair("name", _node.name()),
        make_pair(m_legacy ? "constant" : "isDeclaredConst", _node.isDeclaredConst()),
        make_pair("payable", _node.isPayable()),
        make_pair("visibility", visibility(_node.visibility())),
        make_pair("parameters", toJson(_node.parameterList())),
        make_pair("isConstructor", _node.isConstructor()),
        make_pair("returnParameters", toJson(*_node.returnParameterList())),
        make_pair("modifiers", toJson(_node.modifiers())),
        make_pair("body", _node.isImplemented() ? toJson(_node.body()) : Json::nullValue),
        make_pair("implemented", _node.isImplemented()),
        make_pair("scope", idOrNull(_node.scope()))
    };
    setJsonNode(_node, "FunctionDefinition", std::move(attributes));
    return false;
}

bool ASTJsonConverter::visit(VariableDeclaration const& _node)
{
    std::vector<pair<string, Json::Value>> attributes = {
        make_pair("name", _node.name()),
        make_pair("typeName", toJsonOrNull(_node.typeName())),
        make_pair("constant", _node.isConstant()),
        make_pair("stateVariable", _node.isStateVariable()),
        make_pair("storageLocation", location(_node.referenceLocation())),
        make_pair("visibility", visibility(_node.visibility())),
        make_pair("value", _node.value() ? toJson(*_node.value()) : Json::nullValue),
        make_pair("scope", idOrNull(_node.scope())),
        make_pair("typeDescriptions", typePointerToJson(_node.annotation().type))
    };
    if (m_inEvent)
        attributes.push_back(make_pair("indexed", _node.isIndexed()));
    setJsonNode(_node, "VariableDeclaration", std::move(attributes));
    return false;
}

bool ASTJsonConverter::visit(ModifierDefinition const& _node)
{
    setJsonNode(_node, "ModifierDefinition", {
        make_pair("name", _node.name()),
        make_pair("visibility", visibility(_node.visibility())),
        make_pair("parameters", toJson(_node.parameterList())),
        make_pair("body", toJson(_node.body()))
    });
    return false;
}

bool ASTJsonConverter::visit(ModifierInvocation const& _node)
{
    setJsonNode(_node, "ModifierInvocation", {
        make_pair("modifierName", toJson(*_node.name())),
        make_pair("arguments", toJson(_node.arguments()))
    });
    return false;
}

bool ASTJsonConverter::visit(TypeName const&)
{
    solAssert(false, "AST node of abstract type used.");
    return false;
}

bool ASTJsonConverter::visit(EventDefinition const& _node)
{
    m_inEvent = true;
    setJsonNode(_node, "EventDefinition", {
        make_pair("name", _node.name()),
        make_pair("parameters", toJson(_node.parameterList())),
        make_pair("anonymous", _node.isAnonymous())
    });
    return false;
}

bool ASTJsonConverter::visit(ElementaryTypeName const& _node)
{
    setJsonNode(_node, "ElementaryTypeName", {
        make_pair("name", _node.typeName().toString()),
        make_pair("typeDescriptions", typePointerToJson(_node.annotation().type))
    });
    return false;
}

bool ASTJsonConverter::visit(UserDefinedTypeName const& _node)
{
    setJsonNode(_node, "UserDefinedTypeName", {
        make_pair("name", namePathToString(_node.namePath())),
        make_pair("referencedDeclaration", idOrNull(_node.annotation().referencedDeclaration)),
        make_pair("contractScope", idOrNull(_node.annotation().contractScope)),
        make_pair("typeDescriptions", typePointerToJson(_node.annotation().type))
    });
    return false;
}

bool ASTJsonConverter::visit(FunctionTypeName const& _node)
{
    setJsonNode(_node, "FunctionTypeName", {
        make_pair("payable", _node.isPayable()),
        make_pair("visibility", visibility(_node.visibility())),
        make_pair(m_legacy ? "constant" : "isDeclaredConst", _node.isDeclaredConst()),
        make_pair("parameterTypes", toJson(*_node.parameterTypeList())),
        make_pair("returnParameterTypes", toJson(*_node.returnParameterTypeList())),
        make_pair("typeDescriptions", typePointerToJson(_node.annotation().type))
    });
    return false;
}

bool ASTJsonConverter::visit(Mapping const& _node)
{
    setJsonNode(_node, "Mapping", {
        make_pair("keyType", toJson(_node.keyType())),
        make_pair("valueType", toJson(_node.valueType())),
        make_pair("typeDescriptions", typePointerToJson(_node.annotation().type))
    });
    return false;
}

bool ASTJsonConverter::visit(ArrayTypeName const& _node)
{
    setJsonNode(_node, "ArrayTypeName", {
        make_pair("baseType", toJson(_node.baseType())),
        make_pair("length", toJsonOrNull(_node.length())),
        make_pair("typeDescriptions", typePointerToJson(_node.annotation().type))
    });
    return false;
}

bool ASTJsonConverter::visit(InlineAssembly const& _node)
{
    Json::Value externalReferences(Json::arrayValue);
    for (auto const& it : _node.annotation().externalReferences)
    {
        if (it.first)
        {
            Json::Value tuple(Json::objectValue);
            tuple[it.first->name] = inlineAssemblyIdentifierToJson(it);
            externalReferences.append(tuple);
        }
    }
    setJsonNode(_node, "InlineAssembly", {
        make_pair("operations", Json::Value(assembly::AsmPrinter()(_node.operations()))),
        make_pair("externalReferences", std::move(externalReferences))
    });
    return false;
}

bool ASTJsonConverter::visit(Block const& _node)
{
    setJsonNode(_node, "Block", {
        make_pair("statements", toJson(_node.statements()))
    });
    return false;
}

bool ASTJsonConverter::visit(PlaceholderStatement const& _node)
{
    setJsonNode(_node, "PlaceholderStatement", {});
    return false;
}

bool ASTJsonConverter::visit(IfStatement const& _node)
{
    setJsonNode(_node, "IfStatement", {
        make_pair("condition", toJson(_node.condition())),
        make_pair("trueBody", toJson(_node.trueStatement())),
        make_pair("falseBody", toJsonOrNull(_node.falseStatement()))
    });
    return false;
}

bool ASTJsonConverter::visit(WhileStatement const& _node)
{
    setJsonNode(
        _node,
        _node.isDoWhile() ? "DoWhileStatement" : "WhileStatement",
        {
            make_pair("condition", toJson(_node.condition())),
            make_pair("body", toJson(_node.body()))
        }
    );
    return false;
}

bool ASTJsonConverter::visit(ForStatement const& _node)
{
    setJsonNode(_node, "ForStatement", {
        make_pair("initializationExpression", toJsonOrNull(_node.initializationExpression())),
        make_pair("condition", toJsonOrNull(_node.condition())),
        make_pair("loopExpression", toJsonOrNull(_node.loopExpression())),
        make_pair("body", toJson(_node.body()))
    });
    return false;
}

bool ASTJsonConverter::visit(Continue const& _node)
{
    setJsonNode(_node, "Continue", {});
    return false;
}

bool ASTJsonConverter::visit(Break const& _node)
{
    setJsonNode(_node, "Break", {});
    return false;
}

bool ASTJsonConverter::visit(Return const& _node)
{
    setJsonNode(_node, "Return", {
        make_pair("expression", toJsonOrNull(_node.expression())),
        make_pair("functionReturnParameters", idOrNull(_node.annotation().functionReturnParameters))
    });
    return false;
}

bool ASTJsonConverter::visit(Throw const& _node)
{
    setJsonNode(_node, "Throw", {});;
    return false;
}

bool ASTJsonConverter::visit(VariableDeclarationStatement const& _node)
{
    Json::Value varDecs(Json::arrayValue);
    for (auto const& v: _node.annotation().assignments)
        varDecs.append(idOrNull(v));
    setJsonNode(_node, "VariableDeclarationStatement", {
        make_pair("assignments", std::move(varDecs)),
        make_pair("declarations", toJson(_node.declarations())),
        make_pair("initialValue", toJsonOrNull(_node.initialValue()))
    });
    return false;
}

bool ASTJsonConverter::visit(ExpressionStatement const& _node)
{
    setJsonNode(_node, "ExpressionStatement", {
        make_pair("expression", toJson(_node.expression()))
    });
    return false;
}

bool ASTJsonConverter::visit(Conditional const& _node)
{
    std::vector<pair<string, Json::Value>> attributes = {
        make_pair("condition", toJson(_node.condition())),
        make_pair("trueExpression", toJson(_node.trueExpression())),
        make_pair("falseExpression", toJson(_node.falseExpression()))
    };
    appendExpressionAttributes(attributes, _node.annotation());
    setJsonNode(_node, "Conditional", std::move(attributes));
    return false;
}

bool ASTJsonConverter::visit(Assignment const& _node)
{
    std::vector<pair<string, Json::Value>> attributes = {
        make_pair("operator", Token::toString(_node.assignmentOperator())),
        make_pair("leftHandSide", toJson(_node.leftHandSide())),
        make_pair("rightHandSide", toJson(_node.rightHandSide()))
    };
    appendExpressionAttributes(attributes, _node.annotation());
    setJsonNode( _node, "Assignment", std::move(attributes));
    return false;
}

bool ASTJsonConverter::visit(TupleExpression const& _node)
{
    std::vector<pair<string, Json::Value>> attributes = {
        make_pair("isInlineArray", Json::Value(_node.isInlineArray())),
        make_pair("components", toJson(_node.components())),
    };
    appendExpressionAttributes(attributes, _node.annotation());
    setJsonNode(_node, "TupleExpression", std::move(attributes));
    return false;
}

bool ASTJsonConverter::visit(UnaryOperation const& _node)
{
    std::vector<pair<string, Json::Value>> attributes = {
        make_pair("prefix", _node.isPrefixOperation()),
        make_pair("operator", Token::toString(_node.getOperator())),
        make_pair("subExpression", toJson(_node.subExpression()))
    };
    appendExpressionAttributes(attributes, _node.annotation());
    setJsonNode(_node, "UnaryOperation", std::move(attributes));
    return false;
}

bool ASTJsonConverter::visit(BinaryOperation const& _node)
{
    std::vector<pair<string, Json::Value>> attributes = {
        make_pair("operator", Token::toString(_node.getOperator())),
        make_pair("leftExpression", toJson(_node.leftExpression())),
        make_pair("rightExpression", toJson(_node.rightExpression())),
        make_pair("commonType", typePointerToJson(_node.annotation().commonType)),
    };
    appendExpressionAttributes(attributes, _node.annotation());
    setJsonNode(_node, "BinaryOperation", std::move(attributes));
    return false;
}

bool ASTJsonConverter::visit(FunctionCall const& _node)
{
    Json::Value names(Json::arrayValue);
    for (auto const& name: _node.names())
        names.append(Json::Value(*name));
    std::vector<pair<string, Json::Value>> attributes = {
        make_pair("expression", toJson(_node.expression())),
        make_pair("names", std::move(names)),
        make_pair("arguments", toJson(_node.arguments()))
    };
    if (m_legacy)
    {
        attributes.push_back(make_pair("isStructConstructorCall", _node.annotation().kind == FunctionCallKind::StructConstructorCall));
        attributes.push_back(make_pair("type_conversion", _node.annotation().kind == FunctionCallKind::TypeConversion));
    }
    else
        attributes.push_back(make_pair("kind", functionCallKind(_node.annotation().kind)));
    appendExpressionAttributes(attributes, _node.annotation());
    setJsonNode(_node, "FunctionCall", std::move(attributes));
    return false;
}

bool ASTJsonConverter::visit(NewExpression const& _node)
{
    std::vector<pair<string, Json::Value>> attributes = {
        make_pair("typeName", toJson(_node.typeName()))
    };
    appendExpressionAttributes(attributes, _node.annotation());
    setJsonNode(_node, "NewExpression", std::move(attributes));
    return false;
}

bool ASTJsonConverter::visit(MemberAccess const& _node)
{
    std::vector<pair<string, Json::Value>> attributes = {
        make_pair(m_legacy ? "member_name" : "memberName", _node.memberName()),
        make_pair("expression", toJson(_node.expression())),
        make_pair("referencedDeclaration", idOrNull(_node.annotation().referencedDeclaration)),
    };
    appendExpressionAttributes(attributes, _node.annotation());
    setJsonNode(_node, "MemberAccess", std::move(attributes));
    return false;
}

bool ASTJsonConverter::visit(IndexAccess const& _node)
{
    std::vector<pair<string, Json::Value>> attributes = {
        make_pair("baseExpression", toJson(_node.baseExpression())),
        make_pair("indexExpression", toJsonOrNull(_node.indexExpression())),
    };
    appendExpressionAttributes(attributes, _node.annotation());
    setJsonNode(_node, "IndexAccess", std::move(attributes));
    return false;
}

bool ASTJsonConverter::visit(Identifier const& _node)
{
    Json::Value overloads(Json::arrayValue);
    for (auto const& dec: _node.annotation().overloadedDeclarations)
        overloads.append(nodeId(*dec));
    setJsonNode(_node, "Identifier", {
        make_pair(m_legacy ? "value" : "name", _node.name()),
        make_pair("referencedDeclaration", idOrNull(_node.annotation().referencedDeclaration)),
        make_pair("overloadedDeclarations", overloads),
        make_pair("typeDescriptions", typePointerToJson(_node.annotation().type)),
        make_pair("argumentTypes", typePointerToJson(_node.annotation().argumentTypes))
    });
    return false;
}

bool ASTJsonConverter::visit(ElementaryTypeNameExpression const& _node)
{
    std::vector<pair<string, Json::Value>> attributes = {
        make_pair(m_legacy ? "value" : "typeName", _node.typeName().toString())
    };
    appendExpressionAttributes(attributes, _node.annotation());
    setJsonNode(_node, "ElementaryTypeNameExpression", std::move(attributes));
    return false;
}

bool ASTJsonConverter::visit(Literal const& _node)
{
    char const* tokenString = Token::toString(_node.token());
    Json::Value value{_node.value()};
    if (!dev::validateUTF8(_node.value()))
        value = Json::nullValue;
    Token::Value subdenomination = Token::Value(_node.subDenomination());
    std::vector<pair<string, Json::Value>> attributes = {
        make_pair("token", tokenString ? tokenString : Json::Value()),
        make_pair("value", value),
        make_pair(m_legacy ? "hexvalue" : "hexValue", toHex(_node.value())),
        make_pair(
            "subdenomination",
            subdenomination == Token::Illegal ?
            Json::nullValue :
            Json::Value{Token::toString(subdenomination)}
        )
    };
    appendExpressionAttributes(attributes, _node.annotation());
    setJsonNode(_node, "Literal", std::move(attributes));
    return false;
}


void ASTJsonConverter::endVisit(EventDefinition const&)
{
    m_inEvent = false;
}

string ASTJsonConverter::visibility(Declaration::Visibility const& _visibility)
{
    switch (_visibility)
    {
    case Declaration::Visibility::Private:
        return "private";
    case Declaration::Visibility::Internal:
        return "internal";
    case Declaration::Visibility::Public:
        return "public";
    case Declaration::Visibility::External:
        return "external";
    default:
        BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unknown declaration visibility."));
    }
}

string ASTJsonConverter::location(VariableDeclaration::Location _location)
{
    switch (_location)
    {
    case VariableDeclaration::Location::Default:
        return "default";
    case VariableDeclaration::Location::Storage:
        return "storage";
    case VariableDeclaration::Location::Memory:
        return "memory";
    default:
        BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unknown declaration location."));
    }
}

string ASTJsonConverter::contractKind(ContractDefinition::ContractKind _kind)
{
    switch (_kind)
    {
    case ContractDefinition::ContractKind::Interface:
        return "interface";
    case ContractDefinition::ContractKind::Contract:
        return "contract";
    case ContractDefinition::ContractKind::Library:
        return "library";
    default:
        BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unknown kind of contract."));
    }
}

string ASTJsonConverter::functionCallKind(FunctionCallKind _kind)
{
    switch (_kind)
    {
    case FunctionCallKind::FunctionCall:
        return "functionCall";
    case FunctionCallKind::TypeConversion:
        return "typeConversion";
    case FunctionCallKind::StructConstructorCall:
        return "structConstructorCall";
    default:
        BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unknown kind of function call ."));
    }
}

string ASTJsonConverter::type(Expression const& _expression)
{
    return _expression.annotation().type ? _expression.annotation().type->toString() : "Unknown";
}

string ASTJsonConverter::type(VariableDeclaration const& _varDecl)
{
    return _varDecl.annotation().type ? _varDecl.annotation().type->toString() : "Unknown";
}

}
}