Textractor/extensions/replacer.cpp
2019-06-18 00:39:50 -04:00

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4.3 KiB
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#include "extension.h"
#include <cwctype>
#include <fstream>
#include <filesystem>
#include <process.h>
extern const wchar_t* REPLACER_INSTRUCTIONS;
constexpr auto REPLACE_SAVE_FILE = u8"SavedReplacements.txt";
std::atomic<std::filesystem::file_time_type> replaceFileLastWrite;
std::shared_mutex m;
struct
{
public:
void Put(std::wstring original, std::wstring replacement)
{
Node* current = &root;
for (auto ch : original)
if (Ignore(ch));
else if (auto& next = current->next[ch]) current = next.get();
else current = (next = std::make_unique<Node>()).get();
if (current != &root) current->value = replacement;
}
std::pair<int, std::optional<std::wstring>> Lookup(const std::wstring& text) const
{
std::pair<int, std::optional<std::wstring>> result = {};
int length = 0;
const Node* current = &root;
for (auto ch : text)
{
if (Ignore(ch))
{
length += 1;
}
else if (current->next.count(ch) != 0)
{
auto& next = current->next.at(ch);
length += 1;
current = next.get();
if (current->value) result = { length, current->value };
}
else break;
}
return result;
}
private:
static bool Ignore(wchar_t ch)
{
return ch <= 0x20 || std::iswspace(ch);
}
struct Node
{
std::unordered_map<wchar_t, std::unique_ptr<Node>> next;
std::optional<std::wstring> value;
} root;
} replacementTrie;
int Parse(const std::wstring& file)
{
std::lock_guard l(m);
replacementTrie = {};
int count = 0;
size_t end = 0;
while (true)
{
size_t original = file.find(L"|ORIG|", end);
size_t becomes = file.find(L"|BECOMES|", original);
if ((end = file.find(L"|END|", becomes)) == std::wstring::npos) break;
replacementTrie.Put(file.substr(original + 6, becomes - original - 6), file.substr(becomes + 9, end - becomes - 9));
count += 1;
}
return count;
}
bool Replace(std::wstring& sentence)
{
std::shared_lock l(m);
for (int i = 0; i < sentence.size(); ++i)
{
auto [length, replacement] = replacementTrie.Lookup(sentence.substr(i));
if (replacement)
{
sentence.replace(i, length, replacement.value());
i += replacement.value().size() - 1; // iterate to end of replacement
}
}
return true;
}
BOOL WINAPI DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
static HANDLE replacementFile; // not actually used to read/write, just to ensure it exists
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
{
replacementFile = CreateFileA(REPLACE_SAVE_FILE, FILE_GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, nullptr, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
std::vector<BYTE> file(std::istreambuf_iterator<char>(std::ifstream(REPLACE_SAVE_FILE, std::ios::in | std::ios::binary)), {});
if (Parse(std::wstring((wchar_t*)file.data(), file.size() / sizeof(wchar_t))) == 0)
{
std::ofstream(REPLACE_SAVE_FILE, std::ios::out | std::ios::binary | std::ios::trunc).write((char*)REPLACER_INSTRUCTIONS, wcslen(REPLACER_INSTRUCTIONS) * sizeof(wchar_t));
_spawnlp(_P_DETACH, "notepad", "notepad", REPLACE_SAVE_FILE, NULL); // show file to user
}
replaceFileLastWrite = std::filesystem::last_write_time(REPLACE_SAVE_FILE);
}
break;
case DLL_PROCESS_DETACH:
{
CloseHandle(replacementFile);
}
break;
}
return TRUE;
}
bool ProcessSentence(std::wstring& sentence, SentenceInfo)
{
static_assert(std::has_unique_object_representations_v<decltype(replaceFileLastWrite)::value_type>);
if (!replaceFileLastWrite.compare_exchange_strong(std::filesystem::last_write_time(REPLACE_SAVE_FILE), std::filesystem::last_write_time(REPLACE_SAVE_FILE)))
{
std::vector<BYTE> file(std::istreambuf_iterator<char>(std::ifstream(REPLACE_SAVE_FILE, std::ios::in | std::ios::binary)), {});
Parse(std::wstring((wchar_t*)file.data(), file.size() / sizeof(wchar_t)));
}
return Replace(sentence);
}
TEST_SYNC(
{
assert(Parse(LR"(|ORIG| さよなら|BECOMES|goodbye|END|
|ORIG||BECOMES|idiot|END|
|ORIG| |BECOMES|hello|END|)") == 3);
std::wstring replaced = LR"(blahblah 
)";
Replace(replaced);
assert(replaced.find(L"さよなら") == std::wstring::npos &&
replaced.find(L"バカ") == std::wstring::npos &&
replaced.find(L"こんにちは") == std::wstring::npos &&
replaced.find(L"goodbye") != std::wstring::npos &&
replaced.find(L"idiot") != std::wstring::npos &&
replaced.find(L"hello") != std::wstring::npos
);
}
);