258 lines
11 KiB
C++
258 lines
11 KiB
C++
#include <hex/pattern_language/preprocessor.hpp>
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#include <hex/helpers/fmt.hpp>
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#include <hex/helpers/paths.hpp>
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#include <hex/helpers/file.hpp>
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#include <filesystem>
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namespace hex::pl {
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std::optional<std::string> Preprocessor::preprocess(const std::string &code, bool initialRun) {
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u32 offset = 0;
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u32 lineNumber = 1;
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bool isInString = false;
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if (initialRun) {
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this->m_defines.clear();
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this->m_pragmas.clear();
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}
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std::string output;
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output.reserve(code.length());
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try {
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bool startOfLine = true;
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while (offset < code.length()) {
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if (offset > 0 && code[offset - 1] != '\\' && code[offset] == '\"')
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isInString = !isInString;
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else if (isInString) {
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output += code[offset];
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offset += 1;
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continue;
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}
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if (code[offset] == '#' && startOfLine) {
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offset += 1;
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if (code.substr(offset, 7) == "include") {
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offset += 7;
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while (std::isblank(code[offset]) || std::isspace(code[offset]))
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offset += 1;
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if (code[offset] != '<' && code[offset] != '"')
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throwPreprocessorError("expected '<' or '\"' before file name", lineNumber);
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char endChar = code[offset];
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if (endChar == '<') endChar = '>';
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offset += 1;
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std::string includeFile;
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while (code[offset] != endChar) {
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includeFile += code[offset];
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offset += 1;
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if (offset >= code.length())
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throwPreprocessorError(hex::format("missing terminating '{0}' character", endChar), lineNumber);
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}
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offset += 1;
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fs::path includePath = includeFile;
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if (includeFile[0] != '/') {
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for (const auto &dir : hex::getPath(ImHexPath::PatternsInclude)) {
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fs::path tempPath = dir / includePath;
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if (fs::exists(tempPath)) {
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includePath = tempPath;
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break;
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}
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}
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}
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File file(includePath, File::Mode::Read);
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if (!file.isValid()) {
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if (includePath.parent_path().filename().string() == "std")
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throwPreprocessorError(hex::format("{0}: No such file or directory.\n\nThis file might be part of the standard library.\nYou can install the standard library though\nthe Content Store found under Help -> Content Store.", includeFile.c_str()), lineNumber);
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else
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throwPreprocessorError(hex::format("{0}: No such file or directory", includeFile.c_str()), lineNumber);
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}
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Preprocessor preprocessor;
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preprocessor.addDefaultPragmaHandlers();
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preprocessor.m_defines = this->m_defines;
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preprocessor.m_onceIncludedFiles = this->m_onceIncludedFiles;
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auto preprocessedInclude = preprocessor.preprocess(file.readString(), /*initialRun =*/false);
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if (!preprocessedInclude.has_value())
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throw *preprocessor.m_error;
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if (preprocessor.shouldOnlyIncludeOnce()) {
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auto [iter, added] = this->m_onceIncludedFiles.insert(includePath);
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if (added) {
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auto content = preprocessedInclude.value();
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std::replace(content.begin(), content.end(), '\n', ' ');
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std::replace(content.begin(), content.end(), '\r', ' ');
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output += content;
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}
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}
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this->m_defines = preprocessor.m_defines;
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this->m_onceIncludedFiles = preprocessor.m_onceIncludedFiles;
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} else if (code.substr(offset, 6) == "define") {
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offset += 6;
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while (std::isblank(code[offset])) {
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offset += 1;
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}
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std::string defineName;
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while (!std::isblank(code[offset])) {
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defineName += code[offset];
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if (offset >= code.length() || code[offset] == '\n' || code[offset] == '\r')
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throwPreprocessorError("no value given in #define directive", lineNumber);
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offset += 1;
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}
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while (std::isblank(code[offset])) {
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offset += 1;
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if (offset >= code.length())
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throwPreprocessorError("no value given in #define directive", lineNumber);
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}
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std::string replaceValue;
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while (code[offset] != '\n' && code[offset] != '\r') {
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if (offset >= code.length())
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throwPreprocessorError("missing new line after #define directive", lineNumber);
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replaceValue += code[offset];
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offset += 1;
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}
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if (replaceValue.empty())
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throwPreprocessorError("no value given in #define directive", lineNumber);
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this->m_defines.emplace(defineName, replaceValue, lineNumber);
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} else if (code.substr(offset, 6) == "pragma") {
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offset += 6;
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while (std::isblank(code[offset])) {
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offset += 1;
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if (code[offset] == '\n' || code[offset] == '\r')
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throwPreprocessorError("no instruction given in #pragma directive", lineNumber);
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}
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std::string pragmaKey;
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while (!std::isblank(code[offset]) && code[offset] != '\n' && code[offset] != '\r') {
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pragmaKey += code[offset];
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if (offset >= code.length())
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throwPreprocessorError("no instruction given in #pragma directive", lineNumber);
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offset += 1;
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}
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while (std::isblank(code[offset]))
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offset += 1;
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std::string pragmaValue;
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while (code[offset] != '\n' && code[offset] != '\r') {
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if (offset >= code.length())
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throwPreprocessorError("missing new line after #pragma directive", lineNumber);
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pragmaValue += code[offset];
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offset += 1;
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}
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this->m_pragmas.emplace(pragmaKey, pragmaValue, lineNumber);
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} else
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throwPreprocessorError("unknown preprocessor directive", lineNumber);
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} else if (code.substr(offset, 2) == "//") {
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while (code[offset] != '\n' && offset < code.length())
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offset += 1;
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} else if (code.substr(offset, 2) == "/*") {
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while (code.substr(offset, 2) != "*/" && offset < code.length()) {
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if (code[offset] == '\n') {
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output += '\n';
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lineNumber++;
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}
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offset += 1;
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}
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offset += 2;
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if (offset >= code.length())
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throwPreprocessorError("unterminated comment", lineNumber - 1);
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}
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if (code[offset] == '\n') {
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lineNumber++;
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startOfLine = true;
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} else if (!std::isspace(code[offset]))
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startOfLine = false;
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output += code[offset];
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offset += 1;
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}
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// Apply defines
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std::vector<std::tuple<std::string, std::string, u32>> sortedDefines;
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std::copy(this->m_defines.begin(), this->m_defines.end(), std::back_inserter(sortedDefines));
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std::sort(sortedDefines.begin(), sortedDefines.end(), [](const auto &left, const auto &right) {
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return std::get<0>(left).size() > std::get<0>(right).size();
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});
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for (const auto &[define, value, defineLine] : sortedDefines) {
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i32 index = 0;
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while ((index = output.find(define, index)) != std::string::npos) {
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output.replace(index, define.length(), value);
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index += value.length();
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}
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}
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// Handle pragmas
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for (const auto &[type, value, pragmaLine] : this->m_pragmas) {
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if (this->m_pragmaHandlers.contains(type)) {
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if (!this->m_pragmaHandlers[type](value))
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throwPreprocessorError(hex::format("invalid value provided to '{0}' #pragma directive", type.c_str()), pragmaLine);
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} else
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throwPreprocessorError(hex::format("no #pragma handler registered for type {0}", type.c_str()), pragmaLine);
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}
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} catch (PatternLanguageError &e) {
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this->m_error = e;
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return std::nullopt;
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}
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return output;
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}
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void Preprocessor::addPragmaHandler(const std::string &pragmaType, const std::function<bool(const std::string &)> &function) {
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this->m_pragmaHandlers[pragmaType] = function;
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}
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void Preprocessor::removePragmaHandler(const std::string &pragmaType) {
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this->m_pragmaHandlers.erase(pragmaType);
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}
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void Preprocessor::addDefaultPragmaHandlers() {
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this->addPragmaHandler("MIME", [](const std::string &value) {
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return !std::all_of(value.begin(), value.end(), isspace) && !value.ends_with('\n') && !value.ends_with('\r');
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});
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this->addPragmaHandler("endian", [](const std::string &value) {
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return value == "big" || value == "little" || value == "native";
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});
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this->addPragmaHandler("once", [this](const std::string &value) {
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this->m_onlyIncludeOnce = true;
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return value.empty();
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});
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}
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} |