1 files changed, 70 insertions, 0 deletions
diff --git a/include/inja/utils.hpp b/include/inja/utils.hpp
new file mode 100644
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--- /dev/null
+++ b/include/inja/utils.hpp
@@ -0,0 +1,70 @@
+// 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_