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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Guido Tack <guido.tack@monash.edu>
*/
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <minizinc/aststring.hh>
#include <iostream>
#include <vector>
#ifndef HAS_MEMCPY_S
namespace {
void memcpy_s(char* dest, size_t /*size*/, const char* src, size_t count) {
memcpy(dest, src, count);
}
} // namespace
#endif
namespace MiniZinc {
int ASTString::levenshteinDistance(const ASTString& other) const {
size_t m = size();
size_t n = other.size();
const char* s = c_str();
const char* t = other.c_str();
assert(m > 0);
assert(n > 0);
// dynamic programming matrix
std::vector<int> dp0(n + 1);
std::vector<int> dp1(n + 1, 0);
// initialise matrix
for (int i = 0; i <= n; i++) {
dp0[i] = i;
}
for (int i = 1; i <= m; i++) {
dp1[0] = i;
for (int j = 1; j <= n; j++) {
int del = dp0[j] + 1;
int ins = dp1[j - 1] + 1;
int sub = dp0[j - 1] + static_cast<int>(s[i - 1] != t[j - 1]);
dp1[j] = std::min(del, std::min(ins, sub));
}
std::swap(dp0, dp1);
}
return dp0[n];
}
ASTStringData::Interner& ASTStringData::interner() {
static Interner _interner;
return _interner;
}
ASTStringData::ASTStringData(const std::string& s)
: ASTChunk(s.size() + sizeof(size_t) + 1, ASTNode::NID_STR) {
memcpy_s(_data + sizeof(size_t), s.size() + 1, s.c_str(), s.size());
*(_data + sizeof(size_t) + s.size()) = 0;
std::hash<std::string> h;
reinterpret_cast<size_t*>(_data)[0] = h(s);
}
ASTStringData* ASTStringData::a(const std::string& s) {
if (s.empty()) {
return nullptr;
}
auto it = interner().find({s.c_str(), s.size()});
if (it != interner().end()) {
return it->second;
}
auto* as = static_cast<ASTStringData*>(alloc(1 + sizeof(size_t) + s.size()));
new (as) ASTStringData(s);
interner().emplace(std::make_pair(as->c_str(), as->size()), as);
return as;
}
} // namespace MiniZinc
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