From 7d4cbf31c0b30a29aa82dd6bcedc3d3cf7e7a811 Mon Sep 17 00:00:00 2001
From: "Jannis M. Hoffmann" <jannis@fehcom.de>
Date: Tue, 10 Oct 2023 22:49:54 +0200
Subject: turn Address into an aggregate add new trim implementation based on
 string_view

---
 src/address.cc        | 48 +++++++++++++++++-------------------------------
 src/include/address.h | 13 +++++++------
 src/include/convert.h | 17 +++++++++++++++++
 src/maildirmessage.cc |  2 +-
 4 files changed, 42 insertions(+), 38 deletions(-)

diff --git a/src/address.cc b/src/address.cc
index 378eff5..94c812f 100644
--- a/src/address.cc
+++ b/src/address.cc
@@ -1,8 +1,8 @@
 /**
- *  @file  address.cc
- *  @brief  Implementation of the Address class
- *  @author Andreas Aardal Hanssen
- *  @date 2005
+ * @file   address.cc
+ * @brief  Implementation of the Address class
+ * @author Andreas Aardal Hanssen
+ * @date   2005
  */
 
 #include "address.h"
@@ -13,48 +13,34 @@
 
 using namespace Binc;
 using std::string;
+using std::string_view;
 
-Address::Address(const string &name, const string &addr)
+Address Address::from(string name, string_view addr)
 {
-  auto pos = addr.find('@');
-
-  this->name = name;
-
-  if (pos != string::npos) {
-    this->local = addr.substr(0, pos);
-    this->host = addr.substr(pos + 1);
-  } else {
-    this->local = addr;
-  }
+  if (auto pos = addr.find('@'); pos != string::npos)
+    return Address{std::move(name), string{addr.substr(0, pos)}, string{addr.substr(pos + 1)}};
+  else
+    return Address{std::move(name), string{addr}};
 }
 
-Address::Address(const string &wholeaddress)
+Address Address::from(string_view wholeaddress)
 {
   auto start = wholeaddress.find('<');
-  string addr;
-
-  if (start != string::npos)
-    addr = wholeaddress.substr(start + 1);
-  else
-    addr = wholeaddress;
+  auto addr = start != string::npos ? wholeaddress.substr(start + 1) : wholeaddress;
+  auto name = start != string::npos ? wholeaddress.substr(0, start) : "";
 
   trim(addr, "<>");
-
-  if (start != string::npos)
-    name = wholeaddress.substr(0, start);
-  else
-    name = "";
-
   trim(name);
   trim(name, "\"");
 
   start = addr.find('@');
-  local = addr.substr(0, start);
-  host = addr.substr(start + 1);
+  auto local = addr.substr(0, start);
+  auto host = addr.substr(start + 1);
 
   trim(local);
   trim(host);
-  trim(name);
+
+  return Address{string{name}, string{local}, string{host}};
 }
 
 string Address::toParenList() const
diff --git a/src/include/address.h b/src/include/address.h
index 2cb4aef..2e354be 100644
--- a/src/include/address.h
+++ b/src/include/address.h
@@ -1,14 +1,15 @@
 /**
- *  @file address.h
- *  @brief  Declaration of the Address class.
- *  @author Andreas Aardal Hanssen
- *  @date 2002-2005
+ * @file   address.h
+ * @brief  Declaration of the Address class.
+ * @author Andreas Aardal Hanssen
+ * @date   2002-2005
  */
 
 #ifndef address_h_included
 #define address_h_included
 
 #include <string>
+#include <string_view>
 
 namespace Binc {
 
@@ -19,8 +20,8 @@ namespace Binc {
 
     std::string toParenList() const;
 
-    Address(const std::string &name, const std::string &addr);
-    Address(const std::string &wholeaddr);
+    static Address from(std::string name, std::string_view addr);
+    static Address from(std::string_view wholeaddr);
   };
 }
 
diff --git a/src/include/convert.h b/src/include/convert.h
index 0c7e703..030c1b5 100644
--- a/src/include/convert.h
+++ b/src/include/convert.h
@@ -15,6 +15,7 @@
 #include <iomanip>
 #include <iostream>
 #include <string>
+#include <string_view>
 #include <vector>
 
 #include <stdio.h>
@@ -130,6 +131,22 @@ namespace Binc {
     chomp(s_in, chars);
   }
 
+  inline void trim(std::string_view &s_in, std::string_view chars = " \t\r\n")
+  {
+    size_t n = 0;
+    while (n < s_in.length() && chars.find(s_in[n]) != std::string_view::npos) {
+      n++;
+    }
+    s_in = s_in.substr(n);
+
+    if (s_in.empty()) return;
+
+    n = s_in.length();
+    while (n > 0 && chars.find(s_in[--n]) != std::string_view::npos) {
+    }
+    s_in = s_in.substr(0, n + 1);
+  }
+
   inline const std::string unfold(const std::string &a, bool removecomment = true)
   {
     std::string tmp;
diff --git a/src/maildirmessage.cc b/src/maildirmessage.cc
index 0ebbad7..95951db 100644
--- a/src/maildirmessage.cc
+++ b/src/maildirmessage.cc
@@ -65,7 +65,7 @@ namespace {
       if (addr.size() != 0) {
         io << "(";
         for (const auto &i : addr)
-          io << Address(i).toParenList();
+          io << Address::from(i).toParenList();
         io << ")";
       } else {
         io << "NIL";
-- 
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