mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
116 lines
3.6 KiB
C++
116 lines
3.6 KiB
C++
/*
|
||
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
|
||
/** @file StringUtils.h
|
||
* @author Balajiganapathi S <balajiganapathi.s@gmail.com>
|
||
* @date 2017
|
||
*
|
||
* String routines
|
||
*/
|
||
|
||
#include <libsolutil/StringUtils.h>
|
||
#include <string>
|
||
#include <vector>
|
||
|
||
using namespace std;
|
||
using namespace solidity::util;
|
||
|
||
bool solidity::util::stringWithinDistance(string const& _str1, string const& _str2, size_t _maxDistance, size_t _lenThreshold)
|
||
{
|
||
if (_str1 == _str2)
|
||
return true;
|
||
|
||
size_t n1 = _str1.size();
|
||
size_t n2 = _str2.size();
|
||
if (_lenThreshold > 0 && n1 * n2 > _lenThreshold)
|
||
return false;
|
||
|
||
size_t distance = stringDistance(_str1, _str2);
|
||
|
||
// if distance is not greater than _maxDistance, and distance is strictly less than length of both names, they can be considered similar
|
||
// this is to avoid irrelevant suggestions
|
||
return distance <= _maxDistance && distance < n1 && distance < n2;
|
||
}
|
||
|
||
size_t solidity::util::stringDistance(string const& _str1, string const& _str2)
|
||
{
|
||
size_t n1 = _str1.size();
|
||
size_t n2 = _str2.size();
|
||
// Optimize by storing only last 2 rows and current row. So first index is considered modulo 3
|
||
// This is a two-dimensional array of size 3 x (n2 + 1).
|
||
vector<size_t> dp(3 * (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)
|
||
{
|
||
size_t x = 0;
|
||
if (min(i1, i2) == 0) // base case
|
||
x = max(i1, i2);
|
||
else
|
||
{
|
||
size_t left = dp[(i1 - 1) % 3 + i2 * 3];
|
||
size_t up = dp[(i1 % 3) + (i2 - 1) * 3];
|
||
size_t upleft = dp[((i1 - 1) % 3) + (i2 - 1) * 3];
|
||
// deletion and insertion
|
||
x = min(left + 1, up + 1);
|
||
if (_str1[i1-1] == _str2[i2-1])
|
||
// same chars, can skip
|
||
x = min(x, upleft);
|
||
else
|
||
// different chars so try substitution
|
||
x = min(x, upleft + 1);
|
||
|
||
// transposing
|
||
if (i1 > 1 && i2 > 1 && _str1[i1 - 1] == _str2[i2 - 2] && _str1[i1 - 2] == _str2[i2 - 1])
|
||
x = min(x, dp[((i1 - 2) % 3) + (i2 - 2) * 3] + 1);
|
||
}
|
||
dp[(i1 % 3) + i2 * 3] = x;
|
||
}
|
||
|
||
return dp[(n1 % 3) + n2 * 3];
|
||
}
|
||
|
||
string solidity::util::quotedAlternativesList(vector<string> const& suggestions)
|
||
{
|
||
vector<string> quotedSuggestions;
|
||
|
||
for (auto& suggestion: suggestions)
|
||
quotedSuggestions.emplace_back("\"" + suggestion + "\"");
|
||
|
||
return joinHumanReadable(quotedSuggestions, ", ", " or ");
|
||
}
|
||
|
||
string solidity::util::suffixedVariableNameList(string const& _baseName, size_t _startSuffix, size_t _endSuffix)
|
||
{
|
||
string result;
|
||
if (_startSuffix < _endSuffix)
|
||
{
|
||
result = _baseName + to_string(_startSuffix++);
|
||
while (_startSuffix < _endSuffix)
|
||
result += ", " + _baseName + to_string(_startSuffix++);
|
||
}
|
||
else if (_endSuffix < _startSuffix)
|
||
{
|
||
result = _baseName + to_string(_endSuffix++);
|
||
while (_endSuffix < _startSuffix)
|
||
result = _baseName + to_string(_endSuffix++) + ", " + result;
|
||
}
|
||
return result;
|
||
}
|