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17175f70da
There is an inline function that assumes the compiler has copy elision optimization which is actually not required until C++17. GCC 4.8 does it but it requires the copy constructor to be defined which is not the case for std::ifstream. Fixed by passing reference by parameter. Co-authored-by: Rafael Lorenzo Alonso <ralorenz@cisco.com>
71 lines
2.0 KiB
C++
71 lines
2.0 KiB
C++
// Copyright (c) 2020 Pantor. All rights reserved.
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#ifndef INCLUDE_INJA_UTILS_HPP_
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#define INCLUDE_INJA_UTILS_HPP_
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#include <algorithm>
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#include <fstream>
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#include <string>
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#include <utility>
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#include "exceptions.hpp"
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#include "string_view.hpp"
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namespace inja {
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inline void open_file_or_throw(const std::string &path, std::ifstream &file) {
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file.exceptions(std::ifstream::failbit | std::ifstream::badbit);
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try {
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file.open(path);
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} catch (const std::ios_base::failure & /*e*/) {
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throw FileError("failed accessing file at '" + path + "'");
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}
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}
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namespace string_view {
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inline nonstd::string_view slice(nonstd::string_view view, size_t start, size_t end) {
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start = std::min(start, view.size());
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end = std::min(std::max(start, end), view.size());
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return view.substr(start, end - start);
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}
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inline std::pair<nonstd::string_view, nonstd::string_view> split(nonstd::string_view view, char Separator) {
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size_t idx = view.find(Separator);
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if (idx == nonstd::string_view::npos) {
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return std::make_pair(view, nonstd::string_view());
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}
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return std::make_pair(slice(view, 0, idx), slice(view, idx + 1, nonstd::string_view::npos));
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}
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inline bool starts_with(nonstd::string_view view, nonstd::string_view prefix) {
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return (view.size() >= prefix.size() && view.compare(0, prefix.size(), prefix) == 0);
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}
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} // namespace string_view
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inline SourceLocation get_source_location(nonstd::string_view content, size_t pos) {
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// Get line and offset position (starts at 1:1)
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auto sliced = string_view::slice(content, 0, pos);
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std::size_t last_newline = sliced.rfind("\n");
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if (last_newline == nonstd::string_view::npos) {
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return {1, sliced.length() + 1};
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}
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// Count newlines
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size_t count_lines = 0;
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size_t search_start = 0;
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while (search_start <= sliced.size()) {
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search_start = sliced.find("\n", search_start) + 1;
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if (search_start <= 0) {
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break;
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}
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count_lines += 1;
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}
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return {count_lines + 1, sliced.length() - last_newline};
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}
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} // namespace inja
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#endif // INCLUDE_INJA_UTILS_HPP_
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