Move net::FormatUrl and friends outside of //net and into //components

components/url_formatter/url_formatter.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "net/base/net_util.h"
-
+#include "components/url_formatter/url_formatter.h"
+
+#include <algorithm>
 #include <map>
-#include <vector>
-
-#include "base/i18n/time_formatting.h"
-#include "base/json/string_escape.h"
+#include <utility>
+
 #include "base/lazy_instance.h"
 #include "base/logging.h"
+#include "base/macros.h"
 #include "base/memory/singleton.h"
 #include "base/stl_util.h"
 #include "base/strings/string_tokenizer.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_offset_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
-#include "base/time/time.h"
-#include "url/gurl.h"
+#include "base/synchronization/lock.h"
 #include "third_party/icu/source/common/unicode/uidna.h"
 #include "third_party/icu/source/common/unicode/uniset.h"
 #include "third_party/icu/source/common/unicode/uscript.h"
-#include "third_party/icu/source/common/unicode/uset.h"
-#include "third_party/icu/source/i18n/unicode/datefmt.h"
 #include "third_party/icu/source/i18n/unicode/regex.h"
 #include "third_party/icu/source/i18n/unicode/ulocdata.h"
-
-using base::Time;
-
-namespace net {
+#include "url/gurl.h"
+#include "url/third_party/mozilla/url_parse.h"
+
+namespace url_formatter {
 
 namespace {
 
-typedef std::vector<size_t> Offsets;
+base::string16 IDNToUnicodeWithAdjustments(
+    const std::string& host,
+    const std::string& languages,
+    base::OffsetAdjuster::Adjustments* adjustments);
+bool IDNToUnicodeOneComponent(const base::char16* comp,
+                              size_t comp_len,
+                              const std::string& languages,
+                              base::string16* out);
+
+class AppendComponentTransform {
+ public:
+  AppendComponentTransform() {}
+  virtual ~AppendComponentTransform() {}
+
+  virtual base::string16 Execute(
+      const std::string& component_text,
+      base::OffsetAdjuster::Adjustments* adjustments) const = 0;
+
+  // NOTE: No DISALLOW_COPY_AND_ASSIGN here, since gcc < 4.3.0 requires an
+  // accessible copy constructor in order to call AppendFormattedComponent()
+  // with an inline temporary (see http://gcc.gnu.org/bugs/#cxx%5Frvalbind ).
+};
+
+class HostComponentTransform : public AppendComponentTransform {
+ public:
+  explicit HostComponentTransform(const std::string& languages)
+      : languages_(languages) {}
+
+ private:
+  base::string16 Execute(
+      const std::string& component_text,
+      base::OffsetAdjuster::Adjustments* adjustments) const override {
+    return IDNToUnicodeWithAdjustments(component_text, languages_,
+                                       adjustments);
+  }
+
+  const std::string& languages_;
+};
+
+class NonHostComponentTransform : public AppendComponentTransform {
+ public:
+  explicit NonHostComponentTransform(net::UnescapeRule::Type unescape_rules)
+      : unescape_rules_(unescape_rules) {
+  }
+
+ private:
+  base::string16 Execute(
+      const std::string& component_text,
+      base::OffsetAdjuster::Adjustments* adjustments) const override {
+    return (unescape_rules_ == net::UnescapeRule::NONE) ?
+        base::UTF8ToUTF16WithAdjustments(component_text, adjustments) :
+        net::UnescapeAndDecodeUTF8URLComponentWithAdjustments(component_text,
+            unescape_rules_, adjustments);
+  }
+
+  const net::UnescapeRule::Type unescape_rules_;
+};
+
+// Transforms the portion of |spec| covered by |original_component| according to
+// |transform|.  Appends the result to |output|.  If |output_component| is
+// non-NULL, its start and length are set to the transformed component's new
+// start and length.  If |adjustments| is non-NULL, appends adjustments (if
+// any) that reflect the transformation the original component underwent to
+// become the transformed value appended to |output|.
+void AppendFormattedComponent(const std::string& spec,
+                              const url::Component& original_component,
+                              const AppendComponentTransform& transform,
+                              base::string16* output,
+                              url::Component* output_component,
+                              base::OffsetAdjuster::Adjustments* adjustments) {
+  DCHECK(output);
+  if (original_component.is_nonempty()) {
+    size_t original_component_begin =
+        static_cast<size_t>(original_component.begin);
+    size_t output_component_begin = output->length();
+    std::string component_str(spec, original_component_begin,
+                              static_cast<size_t>(original_component.len));
+
+    // Transform |component_str| and modify |adjustments| appropriately.
+    base::OffsetAdjuster::Adjustments component_transform_adjustments;
+    output->append(
+        transform.Execute(component_str, &component_transform_adjustments));
+
+    // Shift all the adjustments made for this component so the offsets are
+    // valid for the original string and add them to |adjustments|.
+    for (base::OffsetAdjuster::Adjustments::iterator comp_iter =
+         component_transform_adjustments.begin();
+         comp_iter != component_transform_adjustments.end(); ++comp_iter)
+      comp_iter->original_offset += original_component_begin;
+    if (adjustments) {
+      adjustments->insert(adjustments->end(),
+                          component_transform_adjustments.begin(),
+                          component_transform_adjustments.end());
+    }
+
+    // Set positions of the parsed component.
+    if (output_component) {
+      output_component->begin = static_cast<int>(output_component_begin);
+      output_component->len =
+          static_cast<int>(output->length() - output_component_begin);
+    }
+  } else if (output_component) {
+    output_component->reset();
+  }
+}
+
+// If |component| is valid, its begin is incremented by |delta|.
+void AdjustComponent(int delta, url::Component* component) {
+  if (!component->is_valid())
+    return;
+
+  DCHECK(delta >= 0 || component->begin >= -delta);
+  component->begin += delta;
+}
+
+// Adjusts all the components of |parsed| by |delta|, except for the scheme.
+void AdjustAllComponentsButScheme(int delta, url::Parsed* parsed) {
+  AdjustComponent(delta, &(parsed->username));
+  AdjustComponent(delta, &(parsed->password));
+  AdjustComponent(delta, &(parsed->host));
+  AdjustComponent(delta, &(parsed->port));
+  AdjustComponent(delta, &(parsed->path));
+  AdjustComponent(delta, &(parsed->query));
+  AdjustComponent(delta, &(parsed->ref));
+}
+
+// Helper for FormatUrlWithOffsets().
+base::string16 FormatViewSourceUrl(
+    const GURL& url,
+    const std::string& languages,
+    FormatUrlTypes format_types,
+    net::UnescapeRule::Type unescape_rules,
+    url::Parsed* new_parsed,
+    size_t* prefix_end,
+    base::OffsetAdjuster::Adjustments* adjustments) {
+  DCHECK(new_parsed);
+  const char kViewSource[] = "view-source:";
+  const size_t kViewSourceLength = arraysize(kViewSource) - 1;
+
+  // Format the underlying URL and record adjustments.
+  const std::string& url_str(url.possibly_invalid_spec());
+  adjustments->clear();
+  base::string16 result(base::ASCIIToUTF16(kViewSource) +
+      FormatUrlWithAdjustments(GURL(url_str.substr(kViewSourceLength)),
+                               languages, format_types, unescape_rules,
+                               new_parsed, prefix_end, adjustments));
+  // Revise |adjustments| by shifting to the offsets to prefix that the above
+  // call to FormatUrl didn't get to see.
+  for (base::OffsetAdjuster::Adjustments::iterator it = adjustments->begin();
+       it != adjustments->end(); ++it)
+    it->original_offset += kViewSourceLength;
+
+  // Adjust positions of the parsed components.
+  if (new_parsed->scheme.is_nonempty()) {
+    // Assume "view-source:real-scheme" as a scheme.
+    new_parsed->scheme.len += kViewSourceLength;
+  } else {
+    new_parsed->scheme.begin = 0;
+    new_parsed->scheme.len = kViewSourceLength - 1;
+  }
+  AdjustAllComponentsButScheme(kViewSourceLength, new_parsed);
+
+  if (prefix_end)
+    *prefix_end += kViewSourceLength;
+
+  return result;
+}
+
+// TODO(brettw) bug 734373: check the scripts for each host component and
+// don't un-IDN-ize if there is more than one. Alternatively, only IDN for
+// scripts that the user has installed. For now, just put the entire
+// path through IDN. Maybe this feature can be implemented in ICU itself?
+//
+// We may want to skip this step in the case of file URLs to allow unicode
+// UNC hostnames regardless of encodings.
+base::string16 IDNToUnicodeWithAdjustments(
+    const std::string& host,
+    const std::string& languages,
+    base::OffsetAdjuster::Adjustments* adjustments) {
+  if (adjustments)
+    adjustments->clear();
+  // Convert the ASCII input to a base::string16 for ICU.
+  base::string16 input16;
+  input16.reserve(host.length());
+  input16.insert(input16.end(), host.begin(), host.end());
+
+  // Do each component of the host separately, since we enforce script matching
+  // on a per-component basis.
+  base::string16 out16;
+  for (size_t component_start = 0, component_end;
+       component_start < input16.length();
+       component_start = component_end + 1) {
+    // Find the end of the component.
+    component_end = input16.find('.', component_start);
+    if (component_end == base::string16::npos)
+      component_end = input16.length();  // For getting the last component.
+    size_t component_length = component_end - component_start;
+    size_t new_component_start = out16.length();
+    bool converted_idn = false;
+    if (component_end > component_start) {
+      // Add the substring that we just found.
+      converted_idn = IDNToUnicodeOneComponent(
+          input16.data() + component_start, component_length, languages,
+          &out16);
+    }
+    size_t new_component_length = out16.length() - new_component_start;
+
+    if (converted_idn && adjustments) {
+      adjustments->push_back(base::OffsetAdjuster::Adjustment(
+          component_start, component_length, new_component_length));
+    }
+
+    // Need to add the dot we just found (if we found one).
+    if (component_end < input16.length())
+      out16.push_back('.');
+  }
+  return out16;
+}
 
 // Does some simple normalization of scripts so we can allow certain scripts
 // to exist together.
 // TODO(brettw) bug 880223: we should allow some other languages to be
 // oombined such as Chinese and Latin. We will probably need a more
 // complicated system of language pairs to have more fine-grained control.
 UScriptCode NormalizeScript(UScriptCode code) {
   switch (code) {
     case USCRIPT_KATAKANA:
     case USCRIPT_HIRAGANA:
@@ skipping 306 matching lines @@
     // Something went wrong. Revert to original string.
     out->resize(original_length);
   }
 
   // We get here with no IDN or on error, in which case we just append the
   // literal input.
   out->append(comp, comp_len);
   return false;
 }
 
-// TODO(brettw) bug 734373: check the scripts for each host component and
-// don't un-IDN-ize if there is more than one. Alternatively, only IDN for
-// scripts that the user has installed. For now, just put the entire
-// path through IDN. Maybe this feature can be implemented in ICU itself?
-//
-// We may want to skip this step in the case of file URLs to allow unicode
-// UNC hostnames regardless of encodings.
-base::string16 IDNToUnicodeWithAdjustments(
-    const std::string& host,
-    const std::string& languages,
-    base::OffsetAdjuster::Adjustments* adjustments) {
-  if (adjustments)
-    adjustments->clear();
-  // Convert the ASCII input to a base::string16 for ICU.
-  base::string16 input16;
-  input16.reserve(host.length());
-  input16.insert(input16.end(), host.begin(), host.end());
-
-  // Do each component of the host separately, since we enforce script matching
-  // on a per-component basis.
-  base::string16 out16;
-  {
-    for (size_t component_start = 0, component_end;
-         component_start < input16.length();
-         component_start = component_end + 1) {
-      // Find the end of the component.
-      component_end = input16.find('.', component_start);
-      if (component_end == base::string16::npos)
-        component_end = input16.length();  // For getting the last component.
-      size_t component_length = component_end - component_start;
-      size_t new_component_start = out16.length();
-      bool converted_idn = false;
-      if (component_end > component_start) {
-        // Add the substring that we just found.
-        converted_idn = IDNToUnicodeOneComponent(
-            input16.data() + component_start, component_length, languages,
-            &out16);
-      }
-      size_t new_component_length = out16.length() - new_component_start;
-
-      if (converted_idn && adjustments) {
-        adjustments->push_back(base::OffsetAdjuster::Adjustment(
-            component_start, component_length, new_component_length));
-      }
-
-      // Need to add the dot we just found (if we found one).
-      if (component_end < input16.length())
-        out16.push_back('.');
-    }
-  }
-  return out16;
-}
-
-// If |component| is valid, its begin is incremented by |delta|.
-void AdjustComponent(int delta, url::Component* component) {
-  if (!component->is_valid())
-    return;
-
-  DCHECK(delta >= 0 || component->begin >= -delta);
-  component->begin += delta;
-}
-
-// Adjusts all the components of |parsed| by |delta|, except for the scheme.
-void AdjustAllComponentsButScheme(int delta, url::Parsed* parsed) {
-  AdjustComponent(delta, &(parsed->username));
-  AdjustComponent(delta, &(parsed->password));
-  AdjustComponent(delta, &(parsed->host));
-  AdjustComponent(delta, &(parsed->port));
-  AdjustComponent(delta, &(parsed->path));
-  AdjustComponent(delta, &(parsed->query));
-  AdjustComponent(delta, &(parsed->ref));
-}
-
-// Helper for FormatUrlWithOffsets().
-base::string16 FormatViewSourceUrl(
-    const GURL& url,
-    const std::string& languages,
-    FormatUrlTypes format_types,
-    UnescapeRule::Type unescape_rules,
-    url::Parsed* new_parsed,
-    size_t* prefix_end,
-    base::OffsetAdjuster::Adjustments* adjustments) {
-  DCHECK(new_parsed);
-  const char kViewSource[] = "view-source:";
-  const size_t kViewSourceLength = arraysize(kViewSource) - 1;
-
-  // Format the underlying URL and record adjustments.
-  const std::string& url_str(url.possibly_invalid_spec());
-  adjustments->clear();
-  base::string16 result(base::ASCIIToUTF16(kViewSource) +
-      FormatUrlWithAdjustments(GURL(url_str.substr(kViewSourceLength)),
-                               languages, format_types, unescape_rules,
-                               new_parsed, prefix_end, adjustments));
-  // Revise |adjustments| by shifting to the offsets to prefix that the above
-  // call to FormatUrl didn't get to see.
-  for (base::OffsetAdjuster::Adjustments::iterator it = adjustments->begin();
-       it != adjustments->end(); ++it)
-    it->original_offset += kViewSourceLength;
-
-  // Adjust positions of the parsed components.
-  if (new_parsed->scheme.is_nonempty()) {
-    // Assume "view-source:real-scheme" as a scheme.
-    new_parsed->scheme.len += kViewSourceLength;
-  } else {
-    new_parsed->scheme.begin = 0;
-    new_parsed->scheme.len = kViewSourceLength - 1;
-  }
-  AdjustAllComponentsButScheme(kViewSourceLength, new_parsed);
-
-  if (prefix_end)
-    *prefix_end += kViewSourceLength;
-
-  return result;
-}
-
-class AppendComponentTransform {
- public:
-  AppendComponentTransform() {}
-  virtual ~AppendComponentTransform() {}
-
-  virtual base::string16 Execute(
-      const std::string& component_text,
-      base::OffsetAdjuster::Adjustments* adjustments) const = 0;
-
-  // NOTE: No DISALLOW_COPY_AND_ASSIGN here, since gcc < 4.3.0 requires an
-  // accessible copy constructor in order to call AppendFormattedComponent()
-  // with an inline temporary (see http://gcc.gnu.org/bugs/#cxx%5Frvalbind ).
-};
-
-class HostComponentTransform : public AppendComponentTransform {
- public:
-  explicit HostComponentTransform(const std::string& languages)
-      : languages_(languages) {
-  }
-
- private:
-  base::string16 Execute(
-      const std::string& component_text,
-      base::OffsetAdjuster::Adjustments* adjustments) const override {
-    return IDNToUnicodeWithAdjustments(component_text, languages_,
-                                       adjustments);
-  }
-
-  const std::string& languages_;
-};
-
-class NonHostComponentTransform : public AppendComponentTransform {
- public:
-  explicit NonHostComponentTransform(UnescapeRule::Type unescape_rules)
-      : unescape_rules_(unescape_rules) {
-  }
-
- private:
-  base::string16 Execute(
-      const std::string& component_text,
-      base::OffsetAdjuster::Adjustments* adjustments) const override {
-    return (unescape_rules_ == UnescapeRule::NONE) ?
-        base::UTF8ToUTF16WithAdjustments(component_text, adjustments) :
-        UnescapeAndDecodeUTF8URLComponentWithAdjustments(component_text,
-            unescape_rules_, adjustments);
-  }
-
-  const UnescapeRule::Type unescape_rules_;
-};
-
-// Transforms the portion of |spec| covered by |original_component| according to
-// |transform|.  Appends the result to |output|.  If |output_component| is
-// non-NULL, its start and length are set to the transformed component's new
-// start and length.  If |adjustments| is non-NULL, appends adjustments (if
-// any) that reflect the transformation the original component underwent to
-// become the transformed value appended to |output|.
-void AppendFormattedComponent(const std::string& spec,
-                              const url::Component& original_component,
-                              const AppendComponentTransform& transform,
-                              base::string16* output,
-                              url::Component* output_component,
-                              base::OffsetAdjuster::Adjustments* adjustments) {
-  DCHECK(output);
-  if (original_component.is_nonempty()) {
-    size_t original_component_begin =
-        static_cast<size_t>(original_component.begin);
-    size_t output_component_begin = output->length();
-    std::string component_str(spec, original_component_begin,
-                              static_cast<size_t>(original_component.len));
-
-    // Transform |component_str| and modify |adjustments| appropriately.
-    base::OffsetAdjuster::Adjustments component_transform_adjustments;
-    output->append(
-        transform.Execute(component_str, &component_transform_adjustments));
-
-    // Shift all the adjustments made for this component so the offsets are
-    // valid for the original string and add them to |adjustments|.
-    for (base::OffsetAdjuster::Adjustments::iterator comp_iter =
-         component_transform_adjustments.begin();
-         comp_iter != component_transform_adjustments.end(); ++comp_iter)
-      comp_iter->original_offset += original_component_begin;
-    if (adjustments) {
-      adjustments->insert(adjustments->end(),
-                          component_transform_adjustments.begin(),
-                          component_transform_adjustments.end());
-    }
-
-    // Set positions of the parsed component.
-    if (output_component) {
-      output_component->begin = static_cast<int>(output_component_begin);
-      output_component->len =
-          static_cast<int>(output->length() - output_component_begin);
-    }
-  } else if (output_component) {
-    output_component->reset();
-  }
-}
-
 }  // namespace
 
-const FormatUrlType kFormatUrlOmitNothing                     = 0;
-const FormatUrlType kFormatUrlOmitUsernamePassword            = 1 << 0;
-const FormatUrlType kFormatUrlOmitHTTP                        = 1 << 1;
+const FormatUrlType kFormatUrlOmitNothing = 0;
+const FormatUrlType kFormatUrlOmitUsernamePassword = 1 << 0;
+const FormatUrlType kFormatUrlOmitHTTP = 1 << 1;
 const FormatUrlType kFormatUrlOmitTrailingSlashOnBareHostname = 1 << 2;
-const FormatUrlType kFormatUrlOmitAll = kFormatUrlOmitUsernamePassword |
-    kFormatUrlOmitHTTP | kFormatUrlOmitTrailingSlashOnBareHostname;
+const FormatUrlType kFormatUrlOmitAll =
+    kFormatUrlOmitUsernamePassword | kFormatUrlOmitHTTP |
+    kFormatUrlOmitTrailingSlashOnBareHostname;
 
-base::string16 IDNToUnicode(const std::string& host,
-                            const std::string& languages) {
-  return IDNToUnicodeWithAdjustments(host, languages, NULL);
-}
-
-std::string GetDirectoryListingEntry(const base::string16& name,
-                                     const std::string& raw_bytes,
-                                     bool is_dir,
-                                     int64_t size,
-                                     Time modified) {
-  std::string result;
-  result.append("<script>addRow(");
-  base::EscapeJSONString(name, true, &result);
-  result.append(",");
-  if (raw_bytes.empty()) {
-    base::EscapeJSONString(EscapePath(base::UTF16ToUTF8(name)), true, &result);
-  } else {
-    base::EscapeJSONString(EscapePath(raw_bytes), true, &result);
-  }
-  if (is_dir) {
-    result.append(",1,");
-  } else {
-    result.append(",0,");
-  }
-
-  // Negative size means unknown or not applicable (e.g. directory).
-  base::string16 size_string;
-  if (size >= 0)
-    size_string = FormatBytesUnlocalized(size);
-  base::EscapeJSONString(size_string, true, &result);
-
-  result.append(",");
-
-  base::string16 modified_str;
-  // |modified| can be NULL in FTP listings.
-  if (!modified.is_null()) {
-    modified_str = base::TimeFormatShortDateAndTime(modified);
-  }
-  base::EscapeJSONString(modified_str, true, &result);
-
-  result.append(");</script>\n");
-
+base::string16 FormatUrl(const GURL& url,
+                         const std::string& languages,
+                         FormatUrlTypes format_types,
+                         net::UnescapeRule::Type unescape_rules,
+                         url::Parsed* new_parsed,
+                         size_t* prefix_end,
+                         size_t* offset_for_adjustment) {
+  std::vector<size_t> offsets;
+  if (offset_for_adjustment)
+    offsets.push_back(*offset_for_adjustment);
+  base::string16 result = FormatUrlWithOffsets(url, languages, format_types,
+      unescape_rules, new_parsed, prefix_end, &offsets);
+  if (offset_for_adjustment)
+    *offset_for_adjustment = offsets[0];
   return result;
 }
 
-void AppendFormattedHost(const GURL& url,
-                         const std::string& languages,
-                         base::string16* output) {
-  AppendFormattedComponent(url.possibly_invalid_spec(),
-      url.parsed_for_possibly_invalid_spec().host,
-      HostComponentTransform(languages), output, NULL, NULL);
-}
-
 base::string16 FormatUrlWithOffsets(
     const GURL& url,
     const std::string& languages,
     FormatUrlTypes format_types,
-    UnescapeRule::Type unescape_rules,
+    net::UnescapeRule::Type unescape_rules,
     url::Parsed* new_parsed,
     size_t* prefix_end,
     std::vector<size_t>* offsets_for_adjustment) {
   base::OffsetAdjuster::Adjustments adjustments;
   const base::string16& format_url_return_value =
       FormatUrlWithAdjustments(url, languages, format_types, unescape_rules,
                                new_parsed, prefix_end, &adjustments);
   base::OffsetAdjuster::AdjustOffsets(adjustments, offsets_for_adjustment);
   if (offsets_for_adjustment) {
     std::for_each(
         offsets_for_adjustment->begin(),
         offsets_for_adjustment->end(),
         base::LimitOffset<std::string>(format_url_return_value.length()));
   }
   return format_url_return_value;
 }
 
 base::string16 FormatUrlWithAdjustments(
     const GURL& url,
     const std::string& languages,
     FormatUrlTypes format_types,
-    UnescapeRule::Type unescape_rules,
+    net::UnescapeRule::Type unescape_rules,
     url::Parsed* new_parsed,
     size_t* prefix_end,
     base::OffsetAdjuster::Adjustments* adjustments) {
   DCHECK(adjustments != NULL);
   adjustments->clear();
   url::Parsed parsed_temp;
   if (!new_parsed)
     new_parsed = &parsed_temp;
   else
     *new_parsed = url::Parsed();
@@ skipping 106 matching lines @@
   if (parsed.query.is_valid())
     url_string.push_back('?');
   AppendFormattedComponent(spec, parsed.query,
                            NonHostComponentTransform(unescape_rules),
                            &url_string, &new_parsed->query, adjustments);
 
   // Ref.  This is valid, unescaped UTF-8, so we can just convert.
   if (parsed.ref.is_valid())
     url_string.push_back('#');
   AppendFormattedComponent(spec, parsed.ref,
-                           NonHostComponentTransform(UnescapeRule::NONE),
+                           NonHostComponentTransform(net::UnescapeRule::NONE),
                            &url_string, &new_parsed->ref, adjustments);
 
   // If we need to strip out http do it after the fact.
   if (omit_http && StartsWith(url_string, base::ASCIIToUTF16(kHTTP), true)) {
     const size_t kHTTPSize = arraysize(kHTTP) - 1;
     url_string = url_string.substr(kHTTPSize);
     // Because offsets in the |adjustments| are already calculated with respect
     // to the string with the http:// prefix in it, those offsets remain correct
     // after stripping the prefix.  The only thing necessary is to add an
     // adjustment to reflect the stripped prefix.
     adjustments->insert(adjustments->begin(),
         base::OffsetAdjuster::Adjustment(0, kHTTPSize, 0));
 
     if (prefix_end)
       *prefix_end -= kHTTPSize;
 
     // Adjust new_parsed.
     DCHECK(new_parsed->scheme.is_valid());
     int delta = -(new_parsed->scheme.len + 3);  // +3 for ://.
     new_parsed->scheme.reset();
     AdjustAllComponentsButScheme(delta, new_parsed);
   }
 
   return url_string;
 }
 
-base::string16 FormatUrl(const GURL& url,
-                         const std::string& languages,
-                         FormatUrlTypes format_types,
-                         UnescapeRule::Type unescape_rules,
-                         url::Parsed* new_parsed,
-                         size_t* prefix_end,
-                         size_t* offset_for_adjustment) {
-  Offsets offsets;
-  if (offset_for_adjustment)
-    offsets.push_back(*offset_for_adjustment);
-  base::string16 result = FormatUrlWithOffsets(url, languages, format_types,
-      unescape_rules, new_parsed, prefix_end, &offsets);
-  if (offset_for_adjustment)
-    *offset_for_adjustment = offsets[0];
-  return result;
+bool CanStripTrailingSlash(const GURL& url) {
+  // Omit the path only for standard, non-file URLs with nothing but "/" after
+  // the hostname.
+  return url.IsStandard() && !url.SchemeIsFile() &&
+      !url.SchemeIsFileSystem() && !url.has_query() && !url.has_ref()
+      && url.path() == "/";
 }
 
-}  // namespace net
+void AppendFormattedHost(const GURL& url,
+                         const std::string& languages,
+                         base::string16* output) {
+  AppendFormattedComponent(
+      url.possibly_invalid_spec(), url.parsed_for_possibly_invalid_spec().host,
+      HostComponentTransform(languages), output, NULL, NULL);
+}
+
+base::string16 IDNToUnicode(const std::string& host,
+                            const std::string& languages) {
+  return IDNToUnicodeWithAdjustments(host, languages, NULL);
+}
+
+
+}  // url_formatter