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