mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
96 lines
2.9 KiB
C++
96 lines
2.9 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file StringUtils.h
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* @author Balajiganapathi S <balajiganapathi.s@gmail.com>
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* @date 2017
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*
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* String routines
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*/
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#include "StringUtils.h"
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#include <algorithm>
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#include <string>
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#include <vector>
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using namespace std;
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using namespace dev;
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bool dev::stringWithinDistance(string const& _str1, string const& _str2, size_t _maxDistance)
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{
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if (_str1 == _str2)
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return true;
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size_t n1 = _str1.size();
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size_t n2 = _str2.size();
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size_t distance = stringDistance(_str1, _str2);
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// if distance is not greater than _maxDistance, and distance is strictly less than length of both names, they can be considered similar
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// this is to avoid irrelevant suggestions
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return distance <= _maxDistance && distance < n1 && distance < n2;
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}
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size_t dev::stringDistance(string const& _str1, string const& _str2)
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{
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size_t n1 = _str1.size();
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size_t n2 = _str2.size();
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// Optimize by storing only last 2 rows and current row. So first index is considered modulo 3
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// This is a two-dimensional array of size 3 x (n2 + 1).
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vector<size_t> dp(3 * (n2 + 1));
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// In this dp formulation of Damerau–Levenshtein distance we are assuming that the strings are 1-based to make base case storage easier.
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// So index accesser to _name1 and _name2 have to be adjusted accordingly
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for (size_t i1 = 0; i1 <= n1; ++i1)
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for (size_t i2 = 0; i2 <= n2; ++i2)
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{
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size_t x = 0;
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if (min(i1, i2) == 0) // base case
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x = max(i1, i2);
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else
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{
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size_t left = dp[(i1 - 1) % 3 + i2 * 3];
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size_t up = dp[(i1 % 3) + (i2 - 1) * 3];
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size_t upleft = dp[((i1 - 1) % 3) + (i2 - 1) * 3];
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// deletion and insertion
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x = min(left + 1, up + 1);
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if (_str1[i1-1] == _str2[i2-1])
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// same chars, can skip
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x = min(x, upleft);
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else
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// different chars so try substitution
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x = min(x, upleft + 1);
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// transposing
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if (i1 > 1 && i2 > 1 && _str1[i1 - 1] == _str2[i2 - 2] && _str1[i1 - 2] == _str2[i2 - 1])
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x = min(x, dp[((i1 - 2) % 3) + (i2 - 2) * 3] + 1);
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}
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dp[(i1 % 3) + i2 * 3] = x;
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}
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return dp[(n1 % 3) + n2 * 3];
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}
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string dev::quotedAlternativesList(vector<string> const& suggestions)
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{
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vector<string> quotedSuggestions;
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for (auto& suggestion: suggestions)
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quotedSuggestions.push_back("\"" + suggestion + "\"");
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return joinHumanReadable(quotedSuggestions, ", ", " or ");
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}
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