Initial commit

1 files changed, 53 insertions, 0 deletions

diff --git a/src/str.cc b/src/str.cc
new file mode 100644
index 0000000..44db3a6
--- /dev/null
+++ b/src/str.cc
@@ -0,0 +1,53 @@
+#include "str.hh"
+
+#include <cstddef>
+#include <string_view>
+#include <vector>
+
+namespace str {
+
+namespace {
+
+[[nodiscard]]
+inline bool is_space(char c) {
+  return c == ' ' || c == '\t' || c == '\r' || c == '\n';
+}
+
+}  // namespace
+
+void split(std::string_view str, std::vector<std::string_view>& out,
+           char separator, bool keep_empty) {
+  out.clear();
+
+  size_t offset = 0;
+  while (true) {
+    auto next = str.find(separator, offset);
+    if (next == std::string_view::npos) {
+      if (keep_empty || offset < str.size())
+        out.push_back(str.substr(offset));
+      break;
+    }
+    if (keep_empty || offset < next)
+      out.push_back(str.substr(offset, next - offset));
+    offset = next + 1;
+  }
+}
+
+std::vector<std::string_view> split(std::string_view str, char separator,
+                                    bool keep_empty) {
+  std::vector<std::string_view> vec;
+  split(str, vec, separator, keep_empty);
+  return vec;
+}
+
+std::string_view trim(std::string_view str) {
+  size_t s = 0;
+  size_t e = str.size();
+  while (s < e && is_space(str[s]))
+    ++s;
+  while (e > s && is_space(str[e - 1]))
+    --e;
+  return str.substr(s, e - s);
+}
+
+}  // namespace str