153 lines
4.3 KiB
C++
153 lines
4.3 KiB
C++
#include "extension.h"
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#include <cwctype>
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#include <fstream>
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#include <filesystem>
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#include <process.h>
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extern const wchar_t* REPLACER_INSTRUCTIONS;
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constexpr auto REPLACE_SAVE_FILE = u8"SavedReplacements.txt";
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std::atomic<std::filesystem::file_time_type> replaceFileLastWrite = {};
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std::shared_mutex m;
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class Trie
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{
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public:
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Trie(std::unordered_map<std::wstring, std::wstring> replacements)
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{
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for (const auto& [original, replacement] : replacements)
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{
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Node* current = &root;
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for (auto ch : original) if (!Ignore(ch)) current = Next(current, ch);
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if (current != &root)
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current->value = owningStorage.insert(owningStorage.end(), replacement.c_str(), replacement.c_str() + replacement.size() + 1) - owningStorage.begin();
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}
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}
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std::wstring Replace(const std::wstring& sentence) const
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{
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std::wstring result;
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for (int i = 0; i < sentence.size();)
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{
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std::wstring_view replacement(sentence.c_str() + i, 1);
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int originalLength = 1;
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const Node* current = &root;
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for (int j = i; current && j <= sentence.size(); ++j)
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{
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if (current->value >= 0)
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{
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replacement = owningStorage.data() + current->value;
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originalLength = j - i;
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}
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if (!Ignore(sentence[j])) current = Next(current, sentence[j]);
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}
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result += replacement;
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i += originalLength;
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}
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return result;
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}
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bool Empty()
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{
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return root.charMap.empty();
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}
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private:
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static bool Ignore(wchar_t ch)
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{
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return ch <= 0x20 || std::iswspace(ch);
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}
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template <typename Node>
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static Node* Next(Node* node, wchar_t ch)
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{
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auto it = std::lower_bound(node->charMap.begin(), node->charMap.end(), ch, [](const auto& one, auto two) { return one.first < two; });
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if (it != node->charMap.end() && it->first == ch) return it->second.get();
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if constexpr (!std::is_const_v<Node>) return node->charMap.insert(it, { ch, std::make_unique<Node>() })->second.get();
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return nullptr;
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}
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struct Node
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{
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std::vector<std::pair<wchar_t, std::unique_ptr<Node>>> charMap;
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ptrdiff_t value = -1;
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} root;
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std::vector<wchar_t> owningStorage;
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} trie = { {} };
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std::unordered_map<std::wstring, std::wstring> Parse(std::wstring_view replacementScript)
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{
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std::unordered_map<std::wstring, std::wstring> replacements;
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for (size_t end = 0; ;)
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{
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size_t original = replacementScript.find(L"|ORIG|", end);
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size_t becomes = replacementScript.find(L"|BECOMES|", original);
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if ((end = replacementScript.find(L"|END|", becomes)) == std::wstring::npos) break;
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replacements[std::wstring(replacementScript.substr(original + 6, becomes - original - 6))] = replacementScript.substr(becomes + 9, end - becomes - 9);
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}
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return replacements;
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}
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void UpdateReplacements()
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{
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try
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{
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if (replaceFileLastWrite.exchange(std::filesystem::last_write_time(REPLACE_SAVE_FILE)) == std::filesystem::last_write_time(REPLACE_SAVE_FILE)) return;
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std::vector<BYTE> file(std::istreambuf_iterator(std::ifstream(REPLACE_SAVE_FILE, std::ios::binary)), {});
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std::scoped_lock l(m);
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trie = Trie(Parse({ (wchar_t*)file.data(), file.size() / sizeof(wchar_t) }));
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}
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catch (std::filesystem::filesystem_error) { replaceFileLastWrite.store({}); }
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}
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BOOL WINAPI DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
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{
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switch (ul_reason_for_call)
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{
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case DLL_PROCESS_ATTACH:
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{
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UpdateReplacements();
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if (trie.Empty())
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{
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auto file = std::ofstream(REPLACE_SAVE_FILE, std::ios::binary) << "\xff\xfe";
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for (auto ch : std::wstring_view(REPLACER_INSTRUCTIONS)) file << (ch == L'\n' ? std::string_view("\r\0\n", 4) : std::string_view((char*)&ch, 2));
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_spawnlp(_P_DETACH, "notepad", "notepad", REPLACE_SAVE_FILE, NULL); // show file to user
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}
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}
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break;
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case DLL_PROCESS_DETACH:
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{
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}
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break;
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}
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return TRUE;
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}
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bool ProcessSentence(std::wstring& sentence, SentenceInfo)
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{
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UpdateReplacements();
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std::shared_lock l(m);
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sentence = trie.Replace(sentence);
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return true;
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}
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TEST(
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{
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auto replacements = Parse(LR"(
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|ORIG|さよなら|BECOMES|goodbye |END|Ignore this text
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And this text ツ
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|ORIG|バカ|BECOMES|idiot|END|
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|ORIG|こんにちは |BECOMES| hello|END||ORIG|delete this|BECOMES||END|)");
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assert(replacements.size() == 4);
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std::wstring original = LR"(Don't replace this
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さよなら バカ こんにちは delete this)";
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std::wstring replaced = Trie(std::move(replacements)).Replace(original);
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assert(replaced == L"Don't replace thisgoodbye idiot hello");
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}
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);
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