wehub-resource-sync
96 lines
2.9 KiB
C++
96 lines
2.9 KiB
C++
// Unity build: include simplecpp implementation directly since CGo only
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// compiles .cpp files from the immediate package directory, not subdirs.
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#include "vendored/simplecpp/simplecpp.cpp"
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#include "preprocessor.h"
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#include "vendored/simplecpp/simplecpp.h"
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#include <sstream>
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#include <string>
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#include <vector>
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#include <cstring>
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#include <cstdlib>
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extern "C" {
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char* cbm_preprocess(
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const char* source, int source_len,
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const char* filename,
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const char** extra_defines,
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const char** include_paths,
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int cpp_mode
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) {
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if (!source || source_len <= 0) return NULL;
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// Fast-path: skip if no preprocessor directives worth expanding.
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bool has_macros = false;
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for (int i = 0; i < source_len - 1; i++) {
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if (source[i] == '#') {
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// Skip whitespace after #
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int j = i + 1;
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while (j < source_len && (source[j] == ' ' || source[j] == '\t')) j++;
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int remaining = source_len - j;
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if (remaining >= 6 && strncmp(source + j, "define", 6) == 0) {
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has_macros = true;
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break;
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}
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if (remaining >= 5 && strncmp(source + j, "ifdef", 5) == 0) {
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has_macros = true;
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break;
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}
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if (remaining >= 6 && strncmp(source + j, "ifndef", 6) == 0) {
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has_macros = true;
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break;
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}
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if (remaining >= 3 && strncmp(source + j, "if ", 3) == 0) {
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has_macros = true;
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break;
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}
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}
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}
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if (!has_macros) return NULL; // NULL = no expansion needed, use original
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try {
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simplecpp::DUI dui;
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if (extra_defines) {
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for (int i = 0; extra_defines[i]; i++)
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dui.defines.push_back(extra_defines[i]);
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}
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if (include_paths) {
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for (int i = 0; include_paths[i]; i++)
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dui.includePaths.push_back(include_paths[i]);
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}
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dui.std = cpp_mode ? "c++17" : "c11";
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std::string src(source, source_len);
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std::istringstream istr(src);
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std::vector<std::string> files;
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files.push_back(filename ? filename : "<input>");
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simplecpp::TokenList rawtokens(istr, files, files[0]);
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simplecpp::TokenList output(files);
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simplecpp::FileDataCache filedata = simplecpp::load(rawtokens, files, dui);
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simplecpp::preprocess(output, rawtokens, files, filedata, dui);
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std::string result = output.stringify();
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// Clean up loaded file data
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simplecpp::cleanup(filedata);
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char* out = (char*)malloc(result.size() + 1);
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if (!out) return NULL;
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memcpy(out, result.c_str(), result.size() + 1);
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return out;
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} catch (...) {
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// Graceful fallback: return NULL = use original source
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return NULL;
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}
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}
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void cbm_preprocess_free(char* expanded) {
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free(expanded);
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}
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} // extern "C"
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