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// Copyright (c) 2020 Pantor. All rights reserved.
#ifndef INCLUDE_INJA_UTILS_HPP_
#define INCLUDE_INJA_UTILS_HPP_
#include <algorithm>
#include <fstream>
#include <string>
#include <utility>
#include "exceptions.hpp"
#include "string_view.hpp"
namespace inja {
inline void open_file_or_throw(const std::string &path, std::ifstream &file) {
file.exceptions(std::ifstream::failbit | std::ifstream::badbit);
try {
file.open(path);
} catch (const std::ios_base::failure & /*e*/) {
INJA_THROW(FileError("failed accessing file at '" + path + "'"));
}
}
namespace string_view {
inline nonstd::string_view slice(nonstd::string_view view, size_t start, size_t end) {
start = std::min(start, view.size());
end = std::min(std::max(start, end), view.size());
return view.substr(start, end - start);
}
inline std::pair<nonstd::string_view, nonstd::string_view> split(nonstd::string_view view, char Separator) {
size_t idx = view.find(Separator);
if (idx == nonstd::string_view::npos) {
return std::make_pair(view, nonstd::string_view());
}
return std::make_pair(slice(view, 0, idx), slice(view, idx + 1, nonstd::string_view::npos));
}
inline bool starts_with(nonstd::string_view view, nonstd::string_view prefix) {
return (view.size() >= prefix.size() && view.compare(0, prefix.size(), prefix) == 0);
}
} // namespace string_view
inline SourceLocation get_source_location(nonstd::string_view content, size_t pos) {
// Get line and offset position (starts at 1:1)
auto sliced = string_view::slice(content, 0, pos);
std::size_t last_newline = sliced.rfind("\n");
if (last_newline == nonstd::string_view::npos) {
return {1, sliced.length() + 1};
}
// Count newlines
size_t count_lines = 0;
size_t search_start = 0;
while (search_start <= sliced.size()) {
search_start = sliced.find("\n", search_start) + 1;
if (search_start == 0) {
break;
}
count_lines += 1;
}
return {count_lines + 1, sliced.length() - last_newline};
}
} // namespace inja
#endif // INCLUDE_INJA_UTILS_HPP_
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