wtf reformat test

third_party/WebKit/Source/wtf/text/StringBuilder.cpp

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 15 matching lines @@
 
 #include "wtf/text/StringBuilder.h"
 
 #include "wtf/dtoa.h"
 #include "wtf/text/IntegerToStringConversion.h"
 #include "wtf/text/WTFString.h"
 #include <algorithm>
 
 namespace WTF {
 
-static unsigned expandedCapacity(unsigned capacity, unsigned requiredLength)
-{
-    static const unsigned minimumCapacity = 16;
-    return std::max(requiredLength, std::max(minimumCapacity, capacity * 2));
-}
-
-void StringBuilder::reifyString()
-{
-    if (!m_string.isNull()) {
-        ASSERT(m_string.length() == m_length);
-        return;
-    }
-
-    if (!m_length) {
-        m_string = StringImpl::empty();
-        return;
-    }
-
-    ASSERT(m_buffer && m_length <= m_buffer->length());
-    if (m_length == m_buffer->length()) {
-        m_string = m_buffer.release();
-        return;
-    }
-
-    m_string = m_buffer->substring(0, m_length);
-}
-
-String StringBuilder::reifySubstring(unsigned position, unsigned length) const
-{
-    ASSERT(m_string.isNull());
-    ASSERT(m_buffer);
-    unsigned substringLength = std::min(length, m_length - position);
-    return m_buffer->substring(position, substringLength);
-}
-
-void StringBuilder::resize(unsigned newSize)
-{
-    // Check newSize < m_length, hence m_length > 0.
-    ASSERT(newSize <= m_length);
-    if (newSize == m_length)
-        return;
-    ASSERT(m_length);
-
-    // If there is a buffer, we only need to duplicate it if it has more than one ref.
-    if (m_buffer) {
-        m_string = String(); // Clear the string to remove the reference to m_buffer if any before checking the reference count of m_buffer.
-        if (!m_buffer->hasOneRef()) {
-            if (m_buffer->is8Bit())
-                allocateBuffer(m_buffer->characters8(), m_buffer->length());
-            else
-                allocateBuffer(m_buffer->characters16(), m_buffer->length());
-        }
-        m_length = newSize;
-        return;
-    }
-
-    // Since m_length && !m_buffer, the string must be valid in m_string, and m_string.length() > 0.
-    ASSERT(!m_string.isEmpty());
-    ASSERT(m_length == m_string.length());
-    ASSERT(newSize < m_string.length());
+static unsigned expandedCapacity(unsigned capacity, unsigned requiredLength) {
+  static const unsigned minimumCapacity = 16;
+  return std::max(requiredLength, std::max(minimumCapacity, capacity * 2));
+}
+
+void StringBuilder::reifyString() {
+  if (!m_string.isNull()) {
+    ASSERT(m_string.length() == m_length);
+    return;
+  }
+
+  if (!m_length) {
+    m_string = StringImpl::empty();
+    return;
+  }
+
+  ASSERT(m_buffer && m_length <= m_buffer->length());
+  if (m_length == m_buffer->length()) {
+    m_string = m_buffer.release();
+    return;
+  }
+
+  m_string = m_buffer->substring(0, m_length);
+}
+
+String StringBuilder::reifySubstring(unsigned position, unsigned length) const {
+  ASSERT(m_string.isNull());
+  ASSERT(m_buffer);
+  unsigned substringLength = std::min(length, m_length - position);
+  return m_buffer->substring(position, substringLength);
+}
+
+void StringBuilder::resize(unsigned newSize) {
+  // Check newSize < m_length, hence m_length > 0.
+  ASSERT(newSize <= m_length);
+  if (newSize == m_length)
+    return;
+  ASSERT(m_length);
+
+  // If there is a buffer, we only need to duplicate it if it has more than one ref.
+  if (m_buffer) {
+    m_string =
+        String();  // Clear the string to remove the reference to m_buffer if any before checking the reference count of m_buffer.
+    if (!m_buffer->hasOneRef()) {
+      if (m_buffer->is8Bit())
+        allocateBuffer(m_buffer->characters8(), m_buffer->length());
+      else
+        allocateBuffer(m_buffer->characters16(), m_buffer->length());
+    }
     m_length = newSize;
-    RefPtr<StringImpl> string = m_string.releaseImpl();
-    if (string->hasOneRef()) {
-        // If we're the only ones with a reference to the string, we can
-        // re-purpose the string as m_buffer and continue mutating it.
-        m_buffer = string;
-    } else {
-        // Otherwise, we need to make a copy of the string so that we don't
-        // mutate a String that's held elsewhere.
-        m_buffer = string->substring(0, m_length);
-    }
+    return;
+  }
+
+  // Since m_length && !m_buffer, the string must be valid in m_string, and m_string.length() > 0.
+  ASSERT(!m_string.isEmpty());
+  ASSERT(m_length == m_string.length());
+  ASSERT(newSize < m_string.length());
+  m_length = newSize;
+  RefPtr<StringImpl> string = m_string.releaseImpl();
+  if (string->hasOneRef()) {
+    // If we're the only ones with a reference to the string, we can
+    // re-purpose the string as m_buffer and continue mutating it.
+    m_buffer = string;
+  } else {
+    // Otherwise, we need to make a copy of the string so that we don't
+    // mutate a String that's held elsewhere.
+    m_buffer = string->substring(0, m_length);
+  }
 }
 
 // Allocate a new 8 bit buffer, copying in currentCharacters (these may come from either m_string
 // or m_buffer, neither will be reassigned until the copy has completed).
-void StringBuilder::allocateBuffer(const LChar* currentCharacters, unsigned requiredLength)
-{
-    ASSERT(m_is8Bit);
-    // Copy the existing data into a new buffer, set result to point to the end of the existing data.
-    RefPtr<StringImpl> buffer = StringImpl::createUninitialized(requiredLength, m_bufferCharacters8);
-    memcpy(m_bufferCharacters8, currentCharacters, static_cast<size_t>(m_length) * sizeof(LChar)); // This can't overflow.
-
-    // Update the builder state.
-    m_buffer = buffer.release();
-    m_string = String();
+void StringBuilder::allocateBuffer(const LChar* currentCharacters,
+                                   unsigned requiredLength) {
+  ASSERT(m_is8Bit);
+  // Copy the existing data into a new buffer, set result to point to the end of the existing data.
+  RefPtr<StringImpl> buffer =
+      StringImpl::createUninitialized(requiredLength, m_bufferCharacters8);
+  memcpy(
+      m_bufferCharacters8, currentCharacters,
+      static_cast<size_t>(m_length) * sizeof(LChar));  // This can't overflow.
+
+  // Update the builder state.
+  m_buffer = buffer.release();
+  m_string = String();
 }
 
 // Allocate a new 16 bit buffer, copying in currentCharacters (these may come from either m_string
 // or m_buffer,  neither will be reassigned until the copy has completed).
-void StringBuilder::allocateBuffer(const UChar* currentCharacters, unsigned requiredLength)
-{
-    ASSERT(!m_is8Bit);
-    // Copy the existing data into a new buffer, set result to point to the end of the existing data.
-    RefPtr<StringImpl> buffer = StringImpl::createUninitialized(requiredLength, m_bufferCharacters16);
-    memcpy(m_bufferCharacters16, currentCharacters, static_cast<size_t>(m_length) * sizeof(UChar)); // This can't overflow.
-
-    // Update the builder state.
-    m_buffer = buffer.release();
-    m_string = String();
+void StringBuilder::allocateBuffer(const UChar* currentCharacters,
+                                   unsigned requiredLength) {
+  ASSERT(!m_is8Bit);
+  // Copy the existing data into a new buffer, set result to point to the end of the existing data.
+  RefPtr<StringImpl> buffer =
+      StringImpl::createUninitialized(requiredLength, m_bufferCharacters16);
+  memcpy(
+      m_bufferCharacters16, currentCharacters,
+      static_cast<size_t>(m_length) * sizeof(UChar));  // This can't overflow.
+
+  // Update the builder state.
+  m_buffer = buffer.release();
+  m_string = String();
 }
 
 // Allocate a new 16 bit buffer, copying in currentCharacters (which is 8 bit and may come
 // from either m_string or m_buffer, neither will be reassigned until the copy has completed).
-void StringBuilder::allocateBufferUpConvert(const LChar* currentCharacters, unsigned requiredLength)
-{
-    ASSERT(m_is8Bit);
-    // Copy the existing data into a new buffer, set result to point to the end of the existing data.
-    RefPtr<StringImpl> buffer = StringImpl::createUninitialized(requiredLength, m_bufferCharacters16);
-    for (unsigned i = 0; i < m_length; ++i)
-        m_bufferCharacters16[i] = currentCharacters[i];
-
-    m_is8Bit = false;
-
-    // Update the builder state.
-    m_buffer = buffer.release();
-    m_string = String();
+void StringBuilder::allocateBufferUpConvert(const LChar* currentCharacters,
+                                            unsigned requiredLength) {
+  ASSERT(m_is8Bit);
+  // Copy the existing data into a new buffer, set result to point to the end of the existing data.
+  RefPtr<StringImpl> buffer =
+      StringImpl::createUninitialized(requiredLength, m_bufferCharacters16);
+  for (unsigned i = 0; i < m_length; ++i)
+    m_bufferCharacters16[i] = currentCharacters[i];
+
+  m_is8Bit = false;
+
+  // Update the builder state.
+  m_buffer = buffer.release();
+  m_string = String();
 }
 
 template <>
-void StringBuilder::reallocateBuffer<LChar>(unsigned requiredLength)
-{
-    // If the buffer has only one ref (by this StringBuilder), reallocate it,
-    // otherwise fall back to "allocate and copy" method.
-    m_string = String();
-
-    ASSERT(m_is8Bit);
-    ASSERT(m_buffer->is8Bit());
-
-    allocateBuffer(m_buffer->characters8(), requiredLength);
+void StringBuilder::reallocateBuffer<LChar>(unsigned requiredLength) {
+  // If the buffer has only one ref (by this StringBuilder), reallocate it,
+  // otherwise fall back to "allocate and copy" method.
+  m_string = String();
+
+  ASSERT(m_is8Bit);
+  ASSERT(m_buffer->is8Bit());
+
+  allocateBuffer(m_buffer->characters8(), requiredLength);
 }
 
 template <>
-void StringBuilder::reallocateBuffer<UChar>(unsigned requiredLength)
-{
-    // If the buffer has only one ref (by this StringBuilder), reallocate it,
-    // otherwise fall back to "allocate and copy" method.
-    m_string = String();
-
-    if (m_buffer->is8Bit())
-        allocateBufferUpConvert(m_buffer->characters8(), requiredLength);
-    else
-        allocateBuffer(m_buffer->characters16(), requiredLength);
-}
-
-void StringBuilder::reserveCapacity(unsigned newCapacity)
-{
-    if (m_buffer) {
-        // If there is already a buffer, then grow if necessary.
-        if (newCapacity > m_buffer->length()) {
-            if (m_buffer->is8Bit())
-                reallocateBuffer<LChar>(newCapacity);
-            else
-                reallocateBuffer<UChar>(newCapacity);
-        }
-    } else {
-        // Grow the string, if necessary.
-        if (newCapacity > m_length) {
-            if (!m_length) {
-                LChar* nullPlaceholder = 0;
-                allocateBuffer(nullPlaceholder, newCapacity);
-            } else if (m_string.is8Bit()) {
-                allocateBuffer(m_string.characters8(), newCapacity);
-            } else {
-                allocateBuffer(m_string.characters16(), newCapacity);
-            }
-        }
-    }
+void StringBuilder::reallocateBuffer<UChar>(unsigned requiredLength) {
+  // If the buffer has only one ref (by this StringBuilder), reallocate it,
+  // otherwise fall back to "allocate and copy" method.
+  m_string = String();
+
+  if (m_buffer->is8Bit())
+    allocateBufferUpConvert(m_buffer->characters8(), requiredLength);
+  else
+    allocateBuffer(m_buffer->characters16(), requiredLength);
+}
+
+void StringBuilder::reserveCapacity(unsigned newCapacity) {
+  if (m_buffer) {
+    // If there is already a buffer, then grow if necessary.
+    if (newCapacity > m_buffer->length()) {
+      if (m_buffer->is8Bit())
+        reallocateBuffer<LChar>(newCapacity);
+      else
+        reallocateBuffer<UChar>(newCapacity);
+    }
+  } else {
+    // Grow the string, if necessary.
+    if (newCapacity > m_length) {
+      if (!m_length) {
+        LChar* nullPlaceholder = 0;
+        allocateBuffer(nullPlaceholder, newCapacity);
+      } else if (m_string.is8Bit()) {
+        allocateBuffer(m_string.characters8(), newCapacity);
+      } else {
+        allocateBuffer(m_string.characters16(), newCapacity);
+      }
+    }
+  }
 }
 
 // Make 'length' additional capacity be available in m_buffer, update m_string & m_length,
 // return a pointer to the newly allocated storage.
 template <typename CharType>
-ALWAYS_INLINE CharType* StringBuilder::appendUninitialized(unsigned length)
-{
-    ASSERT(length);
+ALWAYS_INLINE CharType* StringBuilder::appendUninitialized(unsigned length) {
+  ASSERT(length);
+
+  // Calculate the new size of the builder after appending.
+  unsigned requiredLength = length + m_length;
+  RELEASE_ASSERT(requiredLength >= length);
+
+  if ((m_buffer) && (requiredLength <= m_buffer->length())) {
+    // If the buffer is valid it must be at least as long as the current builder contents!
+    ASSERT(m_buffer->length() >= m_length);
+    unsigned currentLength = m_length;
+    m_string = String();
+    m_length = requiredLength;
+    return getBufferCharacters<CharType>() + currentLength;
+  }
+
+  return appendUninitializedSlow<CharType>(requiredLength);
+}
+
+// Make 'length' additional capacity be available in m_buffer, update m_string & m_length,
+// return a pointer to the newly allocated storage.
+template <typename CharType>
+CharType* StringBuilder::appendUninitializedSlow(unsigned requiredLength) {
+  ASSERT(requiredLength);
+
+  if (m_buffer) {
+    // If the buffer is valid it must be at least as long as the current builder contents!
+    ASSERT(m_buffer->length() >= m_length);
+
+    reallocateBuffer<CharType>(expandedCapacity(capacity(), requiredLength));
+  } else {
+    ASSERT(m_string.length() == m_length);
+    allocateBuffer(m_length ? m_string.getCharacters<CharType>() : 0,
+                   expandedCapacity(capacity(), requiredLength));
+  }
+
+  CharType* result = getBufferCharacters<CharType>() + m_length;
+  m_length = requiredLength;
+  return result;
+}
+
+void StringBuilder::append(const UChar* characters, unsigned length) {
+  if (!length)
+    return;
+
+  ASSERT(characters);
+
+  if (m_is8Bit) {
+    if (length == 1 && !(*characters & ~0xff)) {
+      // Append as 8 bit character
+      LChar lChar = static_cast<LChar>(*characters);
+      append(&lChar, 1);
+      return;
+    }
 
     // Calculate the new size of the builder after appending.
     unsigned requiredLength = length + m_length;
     RELEASE_ASSERT(requiredLength >= length);
 
-    if ((m_buffer) && (requiredLength <= m_buffer->length())) {
-        // If the buffer is valid it must be at least as long as the current builder contents!
-        ASSERT(m_buffer->length() >= m_length);
-        unsigned currentLength = m_length;
-        m_string = String();
-        m_length = requiredLength;
-        return getBufferCharacters<CharType>() + currentLength;
-    }
-
-    return appendUninitializedSlow<CharType>(requiredLength);
-}
-
-// Make 'length' additional capacity be available in m_buffer, update m_string & m_length,
-// return a pointer to the newly allocated storage.
-template <typename CharType>
-CharType* StringBuilder::appendUninitializedSlow(unsigned requiredLength)
-{
-    ASSERT(requiredLength);
-
     if (m_buffer) {
-        // If the buffer is valid it must be at least as long as the current builder contents!
-        ASSERT(m_buffer->length() >= m_length);
-
-        reallocateBuffer<CharType>(expandedCapacity(capacity(), requiredLength));
+      // If the buffer is valid it must be at least as long as the current builder contents!
+      ASSERT(m_buffer->length() >= m_length);
+
+      allocateBufferUpConvert(m_buffer->characters8(),
+                              expandedCapacity(capacity(), requiredLength));
     } else {
-        ASSERT(m_string.length() == m_length);
-        allocateBuffer(m_length ? m_string.getCharacters<CharType>() : 0, expandedCapacity(capacity(), requiredLength));
-    }
-
-    CharType* result = getBufferCharacters<CharType>() + m_length;
+      ASSERT(m_string.length() == m_length);
+      allocateBufferUpConvert(m_string.isNull() ? 0 : m_string.characters8(),
+                              expandedCapacity(capacity(), requiredLength));
+    }
+
+    memcpy(m_bufferCharacters16 + m_length, characters,
+           static_cast<size_t>(length) * sizeof(UChar));
     m_length = requiredLength;
-    return result;
-}
-
-void StringBuilder::append(const UChar* characters, unsigned length)
-{
-    if (!length)
-        return;
-
-    ASSERT(characters);
-
-    if (m_is8Bit) {
-        if (length == 1 && !(*characters & ~0xff)) {
-            // Append as 8 bit character
-            LChar lChar = static_cast<LChar>(*characters);
-            append(&lChar, 1);
-            return;
-        }
-
-        // Calculate the new size of the builder after appending.
-        unsigned requiredLength = length + m_length;
-        RELEASE_ASSERT(requiredLength >= length);
-
-        if (m_buffer) {
-            // If the buffer is valid it must be at least as long as the current builder contents!
-            ASSERT(m_buffer->length() >= m_length);
-
-            allocateBufferUpConvert(m_buffer->characters8(), expandedCapacity(capacity(), requiredLength));
-        } else {
-            ASSERT(m_string.length() == m_length);
-            allocateBufferUpConvert(m_string.isNull() ? 0 : m_string.characters8(), expandedCapacity(capacity(), requiredLength));
-        }
-
-        memcpy(m_bufferCharacters16 + m_length, characters, static_cast<size_t>(length) * sizeof(UChar));
-        m_length = requiredLength;
+  } else {
+    memcpy(appendUninitialized<UChar>(length), characters,
+           static_cast<size_t>(length) * sizeof(UChar));
+  }
+}
+
+void StringBuilder::append(const LChar* characters, unsigned length) {
+  if (!length)
+    return;
+  ASSERT(characters);
+
+  if (m_is8Bit) {
+    LChar* dest = appendUninitialized<LChar>(length);
+    if (length > 8) {
+      memcpy(dest, characters, static_cast<size_t>(length) * sizeof(LChar));
     } else {
-        memcpy(appendUninitialized<UChar>(length), characters, static_cast<size_t>(length) * sizeof(UChar));
-    }
-}
-
-void StringBuilder::append(const LChar* characters, unsigned length)
-{
-    if (!length)
-        return;
-    ASSERT(characters);
-
-    if (m_is8Bit) {
-        LChar* dest = appendUninitialized<LChar>(length);
-        if (length > 8) {
-            memcpy(dest, characters, static_cast<size_t>(length) * sizeof(LChar));
-        } else {
-            const LChar* end = characters + length;
-            while (characters < end)
-                *(dest++) = *(characters++);
-        }
-    } else {
-        UChar* dest = appendUninitialized<UChar>(length);
-        const LChar* end = characters + length;
-        while (characters < end)
-            *(dest++) = *(characters++);
-    }
-}
-
-void StringBuilder::appendNumber(int number)
-{
-    numberToStringSigned<StringBuilder>(number, this);
-}
-
-void StringBuilder::appendNumber(unsigned number)
-{
-    numberToStringUnsigned<StringBuilder>(number, this);
-}
-
-void StringBuilder::appendNumber(long number)
-{
-    numberToStringSigned<StringBuilder>(number, this);
-}
-
-void StringBuilder::appendNumber(unsigned long number)
-{
-    numberToStringUnsigned<StringBuilder>(number, this);
-}
-
-void StringBuilder::appendNumber(long long number)
-{
-    numberToStringSigned<StringBuilder>(number, this);
-}
-
-void StringBuilder::appendNumber(unsigned long long number)
-{
-    numberToStringUnsigned<StringBuilder>(number, this);
-}
-
-static void expandLCharToUCharInplace(UChar* buffer, size_t length)
-{
-    const LChar* sourceEnd = reinterpret_cast<LChar*>(buffer) + length;
-    UChar* current = buffer + length;
-    while (current != buffer)
-        *--current = *--sourceEnd;
-}
-
-void StringBuilder::appendNumber(double number, unsigned precision, TrailingZerosTruncatingPolicy trailingZerosTruncatingPolicy)
-{
-    bool truncateTrailingZeros = trailingZerosTruncatingPolicy == TruncateTrailingZeros;
-    size_t numberLength;
-    if (m_is8Bit) {
-        LChar* dest = appendUninitialized<LChar>(NumberToStringBufferLength);
-        const char* result = numberToFixedPrecisionString(number, precision, reinterpret_cast<char*>(dest), truncateTrailingZeros);
-        numberLength = strlen(result);
-    } else {
-        UChar* dest = appendUninitialized<UChar>(NumberToStringBufferLength);
-        const char* result = numberToFixedPrecisionString(number, precision, reinterpret_cast<char*>(dest), truncateTrailingZeros);
-        numberLength = strlen(result);
-        expandLCharToUCharInplace(dest, numberLength);
-    }
-    ASSERT(m_length >= NumberToStringBufferLength);
-    // Remove what appendUninitialized added.
-    m_length -= NumberToStringBufferLength;
-    ASSERT(numberLength <= NumberToStringBufferLength);
-    m_length += numberLength;
-}
-
-bool StringBuilder::canShrink() const
-{
-    // Only shrink the buffer if it's less than 80% full. Need to tune this heuristic!
-    return m_buffer && m_buffer->length() > (m_length + (m_length >> 2));
-}
-
-void StringBuilder::shrinkToFit()
-{
-    if (!canShrink())
-        return;
-    if (m_is8Bit)
-        reallocateBuffer<LChar>(m_length);
-    else
-        reallocateBuffer<UChar>(m_length);
-    m_string = m_buffer.release();
-}
-
-} // namespace WTF
+      const LChar* end = characters + length;
+      while (characters < end)
+        *(dest++) = *(characters++);
+    }
+  } else {
+    UChar* dest = appendUninitialized<UChar>(length);
+    const LChar* end = characters + length;
+    while (characters < end)
+      *(dest++) = *(characters++);
+  }
+}
+
+void StringBuilder::appendNumber(int number) {
+  numberToStringSigned<StringBuilder>(number, this);
+}
+
+void StringBuilder::appendNumber(unsigned number) {
+  numberToStringUnsigned<StringBuilder>(number, this);
+}
+
+void StringBuilder::appendNumber(long number) {
+  numberToStringSigned<StringBuilder>(number, this);
+}
+
+void StringBuilder::appendNumber(unsigned long number) {
+  numberToStringUnsigned<StringBuilder>(number, this);
+}
+
+void StringBuilder::appendNumber(long long number) {
+  numberToStringSigned<StringBuilder>(number, this);
+}
+
+void StringBuilder::appendNumber(unsigned long long number) {
+  numberToStringUnsigned<StringBuilder>(number, this);
+}
+
+static void expandLCharToUCharInplace(UChar* buffer, size_t length) {
+  const LChar* sourceEnd = reinterpret_cast<LChar*>(buffer) + length;
+  UChar* current = buffer + length;
+  while (current != buffer)
+    *--current = *--sourceEnd;
+}
+
+void StringBuilder::appendNumber(
+    double number,
+    unsigned precision,
+    TrailingZerosTruncatingPolicy trailingZerosTruncatingPolicy) {
+  bool truncateTrailingZeros =
+      trailingZerosTruncatingPolicy == TruncateTrailingZeros;
+  size_t numberLength;
+  if (m_is8Bit) {
+    LChar* dest = appendUninitialized<LChar>(NumberToStringBufferLength);
+    const char* result = numberToFixedPrecisionString(
+        number, precision, reinterpret_cast<char*>(dest),
+        truncateTrailingZeros);
+    numberLength = strlen(result);
+  } else {
+    UChar* dest = appendUninitialized<UChar>(NumberToStringBufferLength);
+    const char* result = numberToFixedPrecisionString(
+        number, precision, reinterpret_cast<char*>(dest),
+        truncateTrailingZeros);
+    numberLength = strlen(result);
+    expandLCharToUCharInplace(dest, numberLength);
+  }
+  ASSERT(m_length >= NumberToStringBufferLength);
+  // Remove what appendUninitialized added.
+  m_length -= NumberToStringBufferLength;
+  ASSERT(numberLength <= NumberToStringBufferLength);
+  m_length += numberLength;
+}
+
+bool StringBuilder::canShrink() const {
+  // Only shrink the buffer if it's less than 80% full. Need to tune this heuristic!
+  return m_buffer && m_buffer->length() > (m_length + (m_length >> 2));
+}
+
+void StringBuilder::shrinkToFit() {
+  if (!canShrink())
+    return;
+  if (m_is8Bit)
+    reallocateBuffer<LChar>(m_length);
+  else
+    reallocateBuffer<UChar>(m_length);
+  m_string = m_buffer.release();
+}
+
+}  // namespace WTF