From 08d988330620725f016b8361f549b33aa5f5f619 Mon Sep 17 00:00:00 2001
From: Sergey Bugaev <bugaevc@gmail.com>
Date: Wed, 25 Sep 2019 11:49:41 +0300
Subject: [PATCH] AK: Add StringBuilder::string_view() and
 StringBuilder::clear()

The former allows you to inspect the string while it's being built.
It's an explicit method rather than `operator StringView()` because
you must remember you can only look at it in between modifications;
appending to the StringBuilder invalidates the StringView.

The latter lets you clear the state of a StringBuilder explicitly, to
start from an empty string again.
---
 AK/StringBuilder.cpp | 14 ++++++++++++--
 AK/StringBuilder.h   |  3 +++
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/AK/StringBuilder.cpp b/AK/StringBuilder.cpp
index 53ad4ba75d..b692bd4a4d 100644
--- a/AK/StringBuilder.cpp
+++ b/AK/StringBuilder.cpp
@@ -68,9 +68,19 @@ ByteBuffer StringBuilder::to_byte_buffer()
 String StringBuilder::to_string()
 {
     auto string = String((const char*)m_buffer.pointer(), m_length);
-    m_buffer.clear();
-    m_length = 0;
+    clear();
     return string;
 }
 
+StringView StringBuilder::string_view() const
+{
+    return StringView { (const char*)m_buffer.pointer(), m_length };
+}
+
+void StringBuilder::clear()
+{
+    m_buffer.clear();
+    m_length = 0;
+}
+
 }
diff --git a/AK/StringBuilder.h b/AK/StringBuilder.h
index 9da31a7e86..b5f9a887f7 100644
--- a/AK/StringBuilder.h
+++ b/AK/StringBuilder.h
@@ -24,6 +24,9 @@ public:
     String to_string();
     ByteBuffer to_byte_buffer();
 
+    StringView string_view() const;
+    void clear();
+
 private:
     void will_append(int);