120 lines
3.8 KiB
C++
120 lines
3.8 KiB
C++
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#include "lang/preprocessor.hpp"
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namespace hex::lang {
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Preprocessor::Preprocessor() {
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}
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std::pair<Result, std::string> Preprocessor::preprocess(const std::string& code, bool applyDefines) {
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u32 offset = 0;
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if (applyDefines)
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this->m_defines.clear();
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std::string output;
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output.reserve(code.length());
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while (offset < code.length()) {
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if (code[offset] == '#') {
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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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return { ResultPreprocessingError, "" };
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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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return { ResultPreprocessingError, "" };
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}
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offset += 1;
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if (includeFile[0] != '/')
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includeFile = "include/" + includeFile;
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FILE *file = fopen(includeFile.c_str(), "r");
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if (file == nullptr)
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return { ResultPreprocessingError, "" };
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fseek(file, 0, SEEK_END);
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size_t size = ftell(file);
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char *buffer = new char[size + 1];
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rewind(file);
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fread(buffer, size, 1, file);
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buffer[size] = 0x00;
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auto [result, preprocessedInclude] = this->preprocess(buffer, false);
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if (result.failed())
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return { ResultPreprocessingError, "" };
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output += preprocessedInclude;
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delete[] buffer;
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fclose(file);
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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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std::string defineName;
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while (!std::isblank(code[offset])) {
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defineName += code[offset];
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offset += 1;
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if (offset >= code.length() || code[offset] == '\n' || code[offset] == '\r')
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return { ResultPreprocessingError, "" };
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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 replaceValue;
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do {
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if (offset >= code.length())
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return { ResultPreprocessingError, "" };
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replaceValue += code[offset];
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offset += 1;
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} while (code[offset] != '\n' && code[offset] != '\r');
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this->m_defines.emplace(defineName, replaceValue);
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}
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}
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output += code[offset];
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offset += 1;
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}
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if (applyDefines) {
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for (const auto &[define, value] : this->m_defines) {
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s32 index = 0;
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while((index = output.find(define, index)) != std::string::npos) {
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if (index > 0) {
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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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}
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}
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return { ResultSuccess, output };
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}
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}
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