introduce string_view

webcc/string.cc

@@ -36,19 +36,19 @@ bool ToSizeT(const std::string& str, int base, std::size_t* size) {
   return true;
 }
 
-void Split(boost::string_view input, char delim, bool compress_token,
-           std::vector<boost::string_view>* output) {
+void Split(string_view input, char delim, bool compress_token,
+           std::vector<string_view>* output) {
   std::size_t i = 0;
   std::size_t p = 0;
 
   i = input.find(delim);
 
-  while (i != boost::string_view::npos) {
+  while (i != string_view::npos) {
     output->emplace_back(input.substr(p, i - p));
     p = i + 1;
 
     if (compress_token) {
-      while (input[p] == delim) {
+      while (p < input.size() && input[p] == delim) {
         ++p;
       }
     }
@@ -59,10 +59,19 @@ void Split(boost::string_view input, char delim, bool compress_token,
   output->emplace_back(input.substr(p, i - p));
 }
 
-bool SplitKV(const std::string& input, char delim, bool trim_spaces,
-             std::string* key, std::string* value) {
+void Trim(string_view& sv, const char* spaces) {
+  sv.remove_prefix(std::min(sv.find_first_not_of(spaces), sv.size()));
+
+  std::size_t pos = sv.find_last_not_of(spaces);
+  if (pos != sv.npos) {
+    sv.remove_suffix(sv.size() - pos - 1);
+  }
+}
+
+bool SplitKV(string_view input, char delim, bool trim_spaces, string_view* key,
+             string_view* value) {
   std::size_t pos = input.find(delim);
-  if (pos == std::string::npos) {
+  if (pos == input.npos) {
     return false;
   }
 
@@ -70,11 +79,23 @@ bool SplitKV(const std::string& input, char delim, bool trim_spaces,
   *value = input.substr(pos + 1);
 
   if (trim_spaces) {
-    boost::trim(*key);
-    boost::trim(*value);
+    Trim(*key);
+    Trim(*value);
   }
 
   return true;
 }
 
+bool SplitKV(string_view input, char delim, bool trim_spaces, std::string* key,
+             std::string* value) {
+  string_view key_view;
+  string_view value_view;
+  if (SplitKV(input, delim, trim_spaces, &key_view, &value_view)) {
+    *key = ToString(key_view);
+    *value = ToString(value_view);
+    return true;
+  }
+  return false;
+}
+
 }  // namespace webcc