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/*
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 Christian <c@ethdev.com>
* @date 2014
* Scope - object that holds declaration of names.
*/
#include <libsolidity/analysis/DeclarationContainer.h>
#include <libsolidity/ast/AST.h>
#include <libsolidity/ast/Types.h>
using namespace std;
using namespace dev;
using namespace dev::solidity;
Declaration const* DeclarationContainer::conflictingDeclaration(
Declaration const& _declaration,
ASTString const* _name
) const
{
if (!_name)
_name = &_declaration.name();
solAssert(!_name->empty(), "");
vector<Declaration const*> declarations;
if (m_declarations.count(*_name))
declarations += m_declarations.at(*_name);
if (m_invisibleDeclarations.count(*_name))
declarations += m_invisibleDeclarations.at(*_name);
if (
dynamic_cast<FunctionDefinition const*>(&_declaration) ||
dynamic_cast<EventDefinition const*>(&_declaration)
)
{
// check that all other declarations with the same name are functions or a public state variable or events.
// And then check that the signatures are different.
for (Declaration const* declaration: declarations)
{
if (auto variableDeclaration = dynamic_cast<VariableDeclaration const*>(declaration))
{
if (variableDeclaration->isStateVariable() && !variableDeclaration->isConstant() && variableDeclaration->isPublic())
continue;
return declaration;
}
if (
dynamic_cast<FunctionDefinition const*>(&_declaration) &&
!dynamic_cast<FunctionDefinition const*>(declaration)
)
return declaration;
if (
dynamic_cast<EventDefinition const*>(&_declaration) &&
!dynamic_cast<EventDefinition const*>(declaration)
)
return declaration;
// Or, continue.
}
}
else if (declarations.size() == 1 && declarations.front() == &_declaration)
return nullptr;
else if (!declarations.empty())
return declarations.front();
return nullptr;
}
bool DeclarationContainer::registerDeclaration(
Declaration const& _declaration,
ASTString const* _name,
bool _invisible,
bool _update
)
{
if (!_name)
_name = &_declaration.name();
if (_name->empty())
return true;
if (_update)
{
solAssert(!dynamic_cast<FunctionDefinition const*>(&_declaration), "Attempt to update function definition.");
m_declarations.erase(*_name);
m_invisibleDeclarations.erase(*_name);
}
else if (conflictingDeclaration(_declaration, _name))
return false;
vector<Declaration const*>& decls = _invisible ? m_invisibleDeclarations[*_name] : m_declarations[*_name];
if (!contains(decls, &_declaration))
decls.push_back(&_declaration);
return true;
}
vector<Declaration const*> DeclarationContainer::resolveName(ASTString const& _name, bool _recursive) const
{
solAssert(!_name.empty(), "Attempt to resolve empty name.");
auto result = m_declarations.find(_name);
if (result != m_declarations.end())
return result->second;
if (_recursive && m_enclosingContainer)
return m_enclosingContainer->resolveName(_name, true);
return vector<Declaration const*>({});
}
vector<ASTString> DeclarationContainer::similarNames(ASTString const& _name) const
{
vector<ASTString> similar;
for (auto const& declaration: m_declarations)
{
string const& declarationName = declaration.first;
if (DeclarationContainer::areSimilarNames(_name, declarationName))
similar.push_back(declarationName);
}
if (m_enclosingContainer)
{
vector<ASTString> enclosingSimilar = m_enclosingContainer->similarNames(_name);
similar.insert(similar.end(), enclosingSimilar.begin(), enclosingSimilar.end());
}
return similar;
}
bool DeclarationContainer::areSimilarNames(ASTString const& _name1, ASTString const& _name2)
{
if (_name1 == _name2)
return true;
size_t n1 = _name1.size(), n2 = _name2.size();
vector<vector<size_t>> dp(n1 + 1, vector<size_t>(n2 + 1));
// In this dp formulation of Damerau–Levenshtein distance we are assuming that the strings are 1-based to make base case storage easier.
// So index accesser to _name1 and _name2 have to be adjusted accordingly
for (size_t i1 = 0; i1 <= n1; ++i1)
{
for (size_t i2 = 0; i2 <= n2; ++i2)
{
if (min(i1, i2) == 0) // base case
dp[i1][i2] = max(i1, i2);
else
{
dp[i1][i2] = min(dp[i1-1][i2] + 1, dp[i1][i2-1] + 1);
// Deletion and insertion
if (_name1[i1-1] == _name2[i2-1])
// Same chars, can skip
dp[i1][i2] = min(dp[i1][i2], dp[i1-1][i2-1]);
else
// Different chars so try substitution
dp[i1][i2] = min(dp[i1][i2], dp[i1-1][i2-1] + 1);
if (i1 > 1 && i2 > 1 && _name1[i1-1] == _name2[i2-2] && _name1[i1-2] == _name2[i2-1])
// Try transposing
dp[i1][i2] = min(dp[i1][i2], dp[i1-2][i2-2] + 1);
}
}
}
size_t distance = dp[n1][n2];
// If distance is not greater than MAXIMUM_DISTANCE, and distance is strictly less than length of both names,
// they can be considered similar this is to avoid irrelevant suggestions
return distance <= MAXIMUM_DISTANCE && distance < n1 && distance < n2;
}
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