150 lines
4.3 KiB
C++
150 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 <atomic>
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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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struct
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{
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public:
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void Put(std::wstring original, std::wstring replacement)
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{
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Node* current = &root;
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for (auto ch : original)
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if (Ignore(ch));
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else if (auto& next = current->next[ch]) current = next.get();
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else current = (next = std::make_unique<Node>()).get();
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if (current != &root) current->value = replacement;
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}
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std::pair<int, std::optional<std::wstring>> Lookup(const std::wstring& text) const
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{
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std::pair<int, std::optional<std::wstring>> result = {};
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int length = 0;
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const Node* current = &root;
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for (auto ch : text)
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{
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if (Ignore(ch))
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{
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length += 1;
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}
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else if (current->next.count(ch) != 0)
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{
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auto& next = current->next.at(ch);
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length += 1;
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current = next.get();
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if (current->value) result = { length, current->value };
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}
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else break;
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}
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return result;
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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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struct Node
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{
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std::unordered_map<wchar_t, std::unique_ptr<Node>> next;
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std::optional<std::wstring> value;
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} root;
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} replacementTrie;
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int Parse(const std::wstring& file)
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{
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std::lock_guard l(m);
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replacementTrie = {};
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int count = 0;
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size_t end = 0;
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while (true)
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{
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size_t original = file.find(L"|ORIG|", end);
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size_t becomes = file.find(L"|BECOMES|", original);
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if ((end = file.find(L"|END|", becomes)) == std::wstring::npos) break;
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replacementTrie.Put(file.substr(original + 6, becomes - original - 6), file.substr(becomes + 9, end - becomes - 9));
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count += 1;
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}
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return count;
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}
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bool Replace(std::wstring& sentence)
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{
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std::shared_lock l(m);
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for (int i = 0; i < sentence.size(); ++i)
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{
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auto[length, replacement] = replacementTrie.Lookup(sentence.substr(i));
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if (replacement)
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{
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sentence.replace(i, length, replacement.value());
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i += replacement.value().size() - 1; // iterate to end of replacement
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}
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}
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return true;
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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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static HANDLE replacementFile; // not actually used to read/write, just to ensure it exists
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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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replacementFile = CreateFileA(REPLACE_SAVE_FILE, FILE_GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, nullptr, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
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std::vector<BYTE> file(std::istreambuf_iterator<char>(std::ifstream(REPLACE_SAVE_FILE, std::ios::in | std::ios::binary)), {});
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if (Parse(std::wstring((wchar_t*)file.data(), file.size() / sizeof(wchar_t))) == 0)
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{
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std::ofstream(REPLACE_SAVE_FILE, std::ios::out | std::ios::binary | std::ios::trunc).write((char*)REPLACER_INSTRUCTIONS, wcslen(REPLACER_INSTRUCTIONS) * sizeof(wchar_t));
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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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replaceFileLastWrite = std::filesystem::last_write_time(REPLACE_SAVE_FILE);
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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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CloseHandle(replacementFile);
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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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static_assert(std::has_unique_object_representations_v<decltype(replaceFileLastWrite)::value_type>);
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if (!replaceFileLastWrite.compare_exchange_strong(std::filesystem::last_write_time(REPLACE_SAVE_FILE), std::filesystem::last_write_time(REPLACE_SAVE_FILE)))
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{
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std::vector<BYTE> file(std::istreambuf_iterator<char>(std::ifstream(REPLACE_SAVE_FILE, std::ios::in | std::ios::binary)), {});
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Parse(std::wstring((wchar_t*)file.data(), file.size() / sizeof(wchar_t)));
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}
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return Replace(sentence);
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}
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TEST_SYNC(
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{
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assert(Parse(LR"(|ORIG| さよなら|BECOMES|goodbye|END|
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|ORIG|バカ|BECOMES|idiot|END|
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|ORIG|こんにちは |BECOMES|hello|END|)") == 3);
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std::wstring replaced = LR"(blahblah
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さよなら バカ こんにちは)";
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Replace(replaced);
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assert(replaced.find(L"さよなら") == std::wstring::npos &&
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replaced.find(L"バカ") == std::wstring::npos &&
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replaced.find(L"こんにちは") == std::wstring::npos &&
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replaced.find(L"goodbye") != std::wstring::npos &&
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replaced.find(L"idiot") != std::wstring::npos &&
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replaced.find(L"hello") != std::wstring::npos
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);
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}
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);
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