1 files changed, 187 insertions, 0 deletions
diff --git a/src/arrow/r/inst/include/cpp11/strings.hpp b/src/arrow/r/inst/include/cpp11/strings.hpp
new file mode 100644
index 000000000..adca2a174
--- /dev/null
+++ b/src/arrow/r/inst/include/cpp11/strings.hpp
@@ -0,0 +1,187 @@
+// cpp11 version: 0.3.1.1
+// vendored on: 2021-08-11
+#pragma once
+
+#include <initializer_list>  // for initializer_list
+#include <string>            // for string, basic_string
+
+#include "cpp11/R.hpp"                // for SEXP, TYPEOF, SEXPREC, SET_STRI...
+#include "cpp11/as.hpp"               // for as_sexp
+#include "cpp11/attribute_proxy.hpp"  // for attribute_proxy
+#include "cpp11/named_arg.hpp"        // for named_arg
+#include "cpp11/protect.hpp"          // for preserved
+#include "cpp11/r_string.hpp"         // for r_string
+#include "cpp11/r_vector.hpp"         // for r_vector, r_vector<>::proxy
+#include "cpp11/sexp.hpp"             // for sexp
+
+// Specializations for strings
+
+namespace cpp11 {
+
+template <>
+inline SEXP r_vector<r_string>::valid_type(SEXP data) {
+  if (TYPEOF(data) != STRSXP) {
+    throw type_error(STRSXP, TYPEOF(data));
+  }
+  return data;
+}
+
+template <>
+inline r_string r_vector<r_string>::operator[](const R_xlen_t pos) const {
+  // NOPROTECT: likely too costly to unwind protect every elt
+  return STRING_ELT(data_, pos);
+}
+
+template <>
+inline r_string* r_vector<r_string>::get_p(bool, SEXP) {
+  return nullptr;
+}
+
+template <>
+inline void r_vector<r_string>::const_iterator::fill_buf(R_xlen_t) {
+  return;
+}
+
+template <>
+inline r_string r_vector<r_string>::const_iterator::operator*() const {
+  return STRING_ELT(data_->data(), pos_);
+}
+
+typedef r_vector<r_string> strings;
+
+namespace writable {
+
+template <>
+inline typename r_vector<r_string>::proxy& r_vector<r_string>::proxy::operator=(
+    const r_string& rhs) {
+  unwind_protect([&] { SET_STRING_ELT(data_, index_, rhs); });
+  return *this;
+}
+
+template <>
+inline r_vector<r_string>::proxy::operator r_string() const {
+  // NOPROTECT: likely too costly to unwind protect every elt
+  return STRING_ELT(data_, index_);
+}
+
+inline bool operator==(const r_vector<r_string>::proxy& lhs, r_string rhs) {
+  return static_cast<r_string>(lhs).operator==(static_cast<std::string>(rhs).c_str());
+}
+
+inline SEXP alloc_or_copy(const SEXP data) {
+  switch (TYPEOF(data)) {
+    case CHARSXP:
+      return cpp11::r_vector<r_string>(safe[Rf_allocVector](STRSXP, 1));
+    case STRSXP:
+      return safe[Rf_shallow_duplicate](data);
+    default:
+      throw type_error(STRSXP, TYPEOF(data));
+  }
+}
+
+inline SEXP alloc_if_charsxp(const SEXP data) {
+  switch (TYPEOF(data)) {
+    case CHARSXP:
+      return cpp11::r_vector<r_string>(safe[Rf_allocVector](STRSXP, 1));
+    case STRSXP:
+      return data;
+    default:
+      throw type_error(STRSXP, TYPEOF(data));
+  }
+}
+
+template <>
+inline r_vector<r_string>::r_vector(const SEXP& data)
+    : cpp11::r_vector<r_string>(alloc_or_copy(data)),
+      protect_(preserved.insert(data_)),
+      capacity_(length_) {
+  if (TYPEOF(data) == CHARSXP) {
+    SET_STRING_ELT(data_, 0, data);
+  }
+}
+
+template <>
+inline r_vector<r_string>::r_vector(SEXP&& data)
+    : cpp11::r_vector<r_string>(alloc_if_charsxp(data)),
+      protect_(preserved.insert(data_)),
+      capacity_(length_) {
+  if (TYPEOF(data) == CHARSXP) {
+    SET_STRING_ELT(data_, 0, data);
+  }
+}
+
+template <>
+inline r_vector<r_string>::r_vector(std::initializer_list<r_string> il)
+    : cpp11::r_vector<r_string>(as_sexp(il)), capacity_(il.size()) {}
+
+template <>
+inline r_vector<r_string>::r_vector(std::initializer_list<const char*> il)
+    : cpp11::r_vector<r_string>(as_sexp(il)), capacity_(il.size()) {}
+
+template <>
+inline r_vector<r_string>::r_vector(std::initializer_list<std::string> il)
+    : cpp11::r_vector<r_string>(as_sexp(il)), capacity_(il.size()) {}
+
+template <>
+inline r_vector<r_string>::r_vector(std::initializer_list<named_arg> il)
+    : cpp11::r_vector<r_string>(safe[Rf_allocVector](STRSXP, il.size())),
+      capacity_(il.size()) {
+  protect_ = preserved.insert(data_);
+  int n_protected = 0;
+
+  try {
+    unwind_protect([&] {
+      Rf_setAttrib(data_, R_NamesSymbol, Rf_allocVector(STRSXP, capacity_));
+      SEXP names = PROTECT(Rf_getAttrib(data_, R_NamesSymbol));
+      ++n_protected;
+      auto it = il.begin();
+      for (R_xlen_t i = 0; i < capacity_; ++i, ++it) {
+        SET_STRING_ELT(data_, i, STRING_ELT(it->value(), 0));
+        SET_STRING_ELT(names, i, Rf_mkCharCE(it->name(), CE_UTF8));
+      }
+      UNPROTECT(n_protected);
+    });
+  } catch (const unwind_exception& e) {
+    preserved.release(protect_);
+    UNPROTECT(n_protected);
+    throw e;
+  }
+}
+
+template <>
+inline void r_vector<r_string>::reserve(R_xlen_t new_capacity) {
+  data_ = data_ == R_NilValue ? safe[Rf_allocVector](STRSXP, new_capacity)
+                              : safe[Rf_xlengthgets](data_, new_capacity);
+
+  SEXP old_protect = protect_;
+  protect_ = preserved.insert(data_);
+  preserved.release(old_protect);
+
+  capacity_ = new_capacity;
+}
+
+template <>
+inline void r_vector<r_string>::push_back(r_string value) {
+  while (length_ >= capacity_) {
+    reserve(capacity_ == 0 ? 1 : capacity_ *= 2);
+  }
+  unwind_protect([&] { SET_STRING_ELT(data_, length_, value); });
+  ++length_;
+}
+
+typedef r_vector<r_string> strings;
+
+template <typename T>
+inline void r_vector<T>::push_back(const named_arg& value) {
+  push_back(value.value());
+  if (Rf_xlength(names()) == 0) {
+    cpp11::writable::strings new_nms(size());
+    names() = new_nms;
+  }
+  cpp11::writable::strings nms(names());
+  nms[size() - 1] = value.name();
+}
+
+}  // namespace writable
+
+}  // namespace cpp11