Re-committing http://codereview.chromium.org/6803005/ after fixing multi-dll build:

third_party/libphonenumber/cpp/src/phonenumberutil.h

+// Copyright (C) 2009 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Utility for international phone numbers.
+//
+// Author: Shaopeng Jia
+// Open-sourced by: Philippe Liard
+
+#ifndef I18N_PHONENUMBERS_PHONENUMBERUTIL_H_
+#define I18N_PHONENUMBERS_PHONENUMBERUTIL_H_
+
+#include <list>
+#include <map>
+#include <set>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "base/scoped_ptr.h"
+#include "base/singleton.h"
+#include "phonenumber.pb.h"
+
+class TelephoneNumber;
+
+namespace i18n {
+namespace phonenumbers {
+
+using std::list;
+using std::map;
+using std::pair;
+using std::set;
+using std::string;
+using std::vector;
+
+using google::protobuf::RepeatedPtrField;
+
+class LoggerAdapter;
+class NumberFormat;
+class PhoneMetadata;
+class PhoneMetadataCollection;
+class PhoneNumber;
+
+class PhoneNumberUtil {
+  friend struct DefaultSingletonTraits<PhoneNumberUtil>;
+  friend class PhoneNumberUtilTest;
+ public:
+  // INTERNATIONAL and NATIONAL formats are consistent with the definition
+  // in ITU-T Recommendation E. 123. For example, the number of the Google
+  // Zürich office will be written as "+41 44 668 1800" in INTERNATIONAL
+  // format, and as "044 668 1800" in NATIONAL format. E164 format is as per
+  // INTERNATIONAL format but with no formatting applied e.g. +41446681800.
+  // RFC3966 is as per INTERNATIONAL format, but with all spaces and other
+  // separating symbols replaced with a hyphen, and with any phone number
+  // extension appended with ";ext=".
+  enum PhoneNumberFormat {
+    E164,
+    INTERNATIONAL,
+    NATIONAL,
+    RFC3966
+  };
+
+  // Type of phone numbers.
+  enum PhoneNumberType {
+    FIXED_LINE,
+    MOBILE,
+    // In some regions (e.g. the USA), it is impossible to distinguish between
+    // fixed-line and mobile numbers by looking at the phone number itself.
+    FIXED_LINE_OR_MOBILE,
+    // Freephone lines
+    TOLL_FREE,
+    PREMIUM_RATE,
+    // The cost of this call is shared between the caller and the recipient, and
+    // is hence typically less than PREMIUM_RATE calls. See
+    // http://en.wikipedia.org/wiki/Shared_Cost_Service for more information.
+    SHARED_COST,
+    // Voice over IP numbers. This includes TSoIP (Telephony Service over IP).
+    VOIP,
+    // A personal number is associated with a particular person, and may be
+    // routed to either a MOBILE or FIXED_LINE number. Some more information can
+    // be found here: http://en.wikipedia.org/wiki/Personal_Numbers
+    PERSONAL_NUMBER,
+    PAGER,
+    // Used for "Universal Access Numbers" or "Company Numbers". They may be
+    // further routed to specific offices, but allow one number to be used for a
+    // company.
+    UAN,
+    // A phone number is of type UNKNOWN when it does not fit any of the known
+    // patterns for a specific region.
+    UNKNOWN
+  };
+
+  // Types of phone number matches. See detailed description beside the
+  // IsNumberMatch() method.
+  enum MatchType {
+    INVALID_NUMBER,  // NOT_A_NUMBER in the java version.
+    NO_MATCH,
+    SHORT_NSN_MATCH,
+    NSN_MATCH,
+    EXACT_MATCH,
+  };
+
+  enum ErrorType {
+    NO_PARSING_ERROR,
+    INVALID_COUNTRY_CODE_ERROR,  // INVALID_COUNTRY_CODE in the java version.
+    NOT_A_NUMBER,
+    TOO_SHORT_AFTER_IDD,
+    TOO_SHORT_NSN,
+    TOO_LONG_NSN,  // TOO_LONG in the java version.
+  };
+
+  // Possible outcomes when testing if a PhoneNumber is possible.
+  enum ValidationResult {
+    IS_POSSIBLE,
+    INVALID_COUNTRY_CODE,
+    TOO_SHORT,
+    TOO_LONG,
+  };
+
+  // Gets a PhoneNumberUtil instance to carry out international phone number
+  // formatting, parsing, or validation. The instance is loaded with phone
+  // number metadata for a number of most commonly used regions, as specified by
+  // DEFAULT_REGIONS_.
+  //
+  // The PhoneNumberUtil is implemented as a singleton. Therefore, calling
+  // getInstance multiple times will only result in one instance being created.
+  static PhoneNumberUtil* GetInstance();
+
+  // Returns true if the number is a valid vanity (alpha) number such as 800
+  // MICROSOFT. A valid vanity number will start with at least 3 digits and will
+  // have three or more alpha characters. This does not do region-specific
+  // checks - to work out if this number is actually valid for a region, it
+  // should be parsed and methods such as IsPossibleNumberWithReason or
+  // IsValidNumber should be used.
+  bool IsAlphaNumber(const string& number) const;
+
+  // Converts all alpha characters in a number to their respective digits on
+  // a keypad, but retains existing formatting.
+  void ConvertAlphaCharactersInNumber(string* number) const;
+
+  // Normalizes a string of characters representing a phone number. This
+  // converts wide-ascii and arabic-indic numerals to European numerals, and
+  // strips punctuation and alpha characters.
+  static void NormalizeDigitsOnly(string* number);
+
+  // Gets the national significant number of a phone number. Note a national
+  // significant number doesn't contain a national prefix or any formatting.
+  void GetNationalSignificantNumber(const PhoneNumber& number,
+                                    string* national_significant_num) const;
+
+  // Gets the length of the geographical area code from the PhoneNumber object
+  // passed in, so that clients could use it to split a national significant
+  // number into geographical area code and subscriber number. It works in such
+  // a way that the resultant subscriber number should be diallable, at least on
+  // some devices. An example of how this could be used:
+  //
+  // const PhoneNumberUtil& phone_util(PhoneNumberUtil::GetInstance());
+  // PhoneNumber number;
+  // phone_util.Parse("16502530000", "US", &number);
+  // string national_significant_number;
+  // phone_util.GetNationalSignificantNumber(number,
+  //                                         &national_significant_number);
+  // string area_code;
+  // string subscriber_number;
+  //
+  // int area_code_length = phone_util.GetLengthOfGeographicalAreaCode(number);
+  // if (area_code_length > 0) {
+  //   area_code = national_significant_number.substring(0, area_code_length);
+  //   subscriber_number = national_significant_number.substring(
+  //       area_code_length, string::npos);
+  // else {
+  //   area_code = "";
+  //   subscriber_number = national_significant_number;
+  // }
+  //
+  // N.B.: area code is a very ambiguous concept, so the I18N team generally
+  // recommends against using it for most purposes, but recommends using the
+  // more general national_number instead. Read the following carefully before
+  // deciding to use this method:
+  //
+  //  - geographical area codes change over time, and this method honors those
+  //    changes; therefore, it doesn't guarantee the stability of the result it
+  //    produces.
+  //  - subscriber numbers may not be diallable from all devices (notably mobile
+  //    devices, which typically requires the full national_number to be dialled
+  //    in most regions).
+  //  - most non-geographical numbers have no area codes.
+  //  - some geographical numbers have no area codes.
+  int GetLengthOfGeographicalAreaCode(const PhoneNumber& number) const;
+
+  // Gets the length of the national destination code (NDC) from the PhoneNumber
+  // object passed in, so that clients could use it to split a national
+  // significant number into NDC and subscriber number. The NDC of a phone
+  // number is normally the first group of digit(s) right after the country
+  // calling code when the number is formatted in the international format, if
+  // there is a subscriber number part that follows. An example of how this
+  // could be used:
+  //
+  // const PhoneNumberUtil& phone_util(PhoneNumberUtil::GetInstance());
+  // PhoneNumber number;
+  // phone_util.Parse("16502530000", "US", &number);
+  // string national_significant_number;
+  // phone_util.GetNationalSignificantNumber(number,
+  //                                         &national_significant_number);
+  // string national_destination_code;
+  // string subscriber_number;
+  //
+  // int national_destination_code_length =
+  //     phone_util.GetLengthOfGeographicalAreaCode(number);
+  // if (national_destination_code_length > 0) {
+  //   national_destination_code = national_significant_number.substring(
+  //       0, national_destination_code_length);
+  //   subscriber_number = national_significant_number.substring(
+  //       national_destination_code_length, string::npos);
+  // else {
+  //   national_destination_code = "";
+  //   subscriber_number = national_significant_number;
+  // }
+  //
+  // Refer to the unittests to see the difference between this function and
+  // GetLengthOfGeographicalAreaCode().
+  int GetLengthOfNationalDestinationCode(const PhoneNumber& number) const;
+
+  // Formats a phone number in the specified format using default rules. Note
+  // that this does not promise to produce a phone number that the user can
+  // dial from where they are - although we do format in either NATIONAL or
+  // INTERNATIONAL format depending on what the client asks for, we do not
+  // currently support a more abbreviated format, such as for users in the
+  // same area who could potentially dial the number without area code.
+  void Format(const PhoneNumber& number,
+              PhoneNumberFormat number_format,
+              string* formatted_number) const;
+
+  // Formats a phone number in the specified format using client-defined
+  // formatting rules.
+  void FormatByPattern(
+      const PhoneNumber& number,
+      PhoneNumberFormat number_format,
+      const RepeatedPtrField<NumberFormat>& user_defined_formats,
+      string* formatted_number) const;
+
+  // Formats a phone number in national format for dialing using the carrier as
+  // specified in the carrier_code. The carrier_code will always be used
+  // regardless of whether the phone number already has a preferred domestic
+  // carrier code stored. If carrier_code contains an empty string, return the
+  // number in national format without any carrier code.
+  void FormatNationalNumberWithCarrierCode(const PhoneNumber& number,
+                                           const string& carrier_code,
+                                           string* formatted_number) const;
+
+  // Formats a phone number in national format for dialing using the carrier as
+  // specified in the preferred_domestic_carrier_code field of the PhoneNumber
+  // object passed in. If that is missing, use the fallback_carrier_code passed
+  // in instead. If there is no preferred_domestic_carrier_code, and the
+  // fallback_carrier_code contains an empty string, return the number in
+  // national format without any carrier code.
+  //
+  // Use FormatNationalNumberWithCarrierCode instead if the carrier code passed
+  // in should take precedence over the number's preferred_domestic_carrier_code
+  // when formatting.
+  void FormatNationalNumberWithPreferredCarrierCode(
+      const PhoneNumber& number,
+      const string& fallback_carrier_code,
+      string* formatted_number) const;
+
+  // Formats a phone number for out-of-country dialing purposes.
+  //
+  // Note this function takes care of the case for calling inside of NANPA
+  // and between Russia and Kazakhstan (who share the same country calling
+  // code). In those cases, no international prefix is used. For regions which
+  // have multiple international prefixes, the number in its INTERNATIONAL
+  // format will be returned instead.
+  void FormatOutOfCountryCallingNumber(
+      const PhoneNumber& number,
+      const string& calling_from,
+      string* formatted_number) const;
+
+  // Formats a phone number using the original phone number format that the
+  // number is parsed from. The original format is embedded in the
+  // country_code_source field of the PhoneNumber object passed in. If such
+  // information is missing, the number will be formatted into the NATIONAL
+  // format by default.
+  void FormatInOriginalFormat(const PhoneNumber& number,
+                              const string& region_calling_from,
+                              string* formatted_number) const;
+
+  // Formats a phone number for out-of-country dialing purposes.
+  //
+  // Note that in this version, if the number was entered originally using alpha
+  // characters and this version of the number is stored in raw_input, this
+  // representation of the number will be used rather than the digit
+  // representation. Grouping information, as specified by characters such as
+  // "-" and " ", will be retained.
+  //
+  // Caveats:
+  // 1) This will not produce good results if the country calling code is both
+  // present in the raw input _and_ is the start of the national number. This
+  // is not a problem in the regions which typically use alpha numbers.
+  // 2) This will also not produce good results if the raw input has any
+  // grouping information within the first three digits of the national number,
+  // and if the function needs to strip preceding digits/words in the raw input
+  // before these digits. Normally people group the first three digits together
+  // so this is not a huge problem - and will be fixed if it proves to be so.
+  void FormatOutOfCountryKeepingAlphaChars(
+      const PhoneNumber& number,
+      const string& calling_from,
+      string* formatted_number) const;
+
+  // Attempts to extract a valid number from a phone number that is too long to
+  // be valid, and resets the PhoneNumber object passed in to that valid
+  // version. If no valid number could be extracted, the PhoneNumber object
+  // passed in will not be modified. It returns true if a valid phone number can
+  // be successfully extracted.
+  bool TruncateTooLongNumber(PhoneNumber* number) const;
+
+  // Gets the type of a phone number.
+  PhoneNumberType GetNumberType(const PhoneNumber& number) const;
+
+  // Tests whether a phone number matches a valid pattern. Note this doesn't
+  // verify the number is actually in use, which is impossible to tell by just
+  // looking at a number itself.
+  bool IsValidNumber(const PhoneNumber& number) const;
+
+  // Tests whether a phone number is valid for a certain region. Note this
+  // doesn't verify the number is actually in use, which is impossible to tell
+  // by just looking at a number itself. If the country calling code is not the
+  // same as the country calling code for the region, this immediately exits
+  // with false.  After this, the specific number pattern rules for the region
+  // are examined.
+  // This is useful for determining for example whether a particular number is
+  // valid for Canada, rather than just a valid NANPA number.
+  //
+  // The region_code parameter is an ISO 3166-1 two-letter country code string.
+  bool IsValidNumberForRegion(
+      const PhoneNumber& number,
+      const string& region_code) const;
+
+  // Returns the region where a phone number is from. This could be used for
+  // geo-coding at the region level.
+  // The country/region is returned as an ISO 3166-1 two-letter country code
+  // string.
+  void GetRegionCodeForNumber(const PhoneNumber& number,
+                              string* region_code) const;
+
+  // Returns the country calling code for a specific region. For example,
+  // this would be 1 for the United States, and 64 for New Zealand.
+  //
+  // The region_code parameter is an ISO 3166-1 two-letter country code string.
+  int GetCountryCodeForRegion(const string& region_code) const;
+
+  // Returns the region code that matches the specific country code. Note that
+  // it is possible that several regions share the same country code (e.g. US
+  // and Canada), and in that case, only one of the regions (normally the one
+  // with the largest population) is returned.
+  //
+  // The region code is returned as an ISO 3166-1 two-letter country code
+  // string.
+  void GetRegionCodeForCountryCode(int country_code, string* region_code) const;
+
+  // Checks if this is a region under the North American Numbering Plan
+  // Administration (NANPA).
+  //
+  // The region_code parameter is an ISO 3166-1 two-letter country code string.
+  bool IsNANPACountry(const string& region_code) const;
+
+  // Checks whether a phone number is a possible number. It provides a more
+  // lenient check than IsValidNumber() in the following sense:
+  //   1. It only checks the length of phone numbers. In particular, it doesn't
+  //      check starting digits of the number.
+  //   2. It doesn't attempt to figure out the type of the number, but uses
+  //      general rules which applies to all types of phone numbers in a
+  //      region. Therefore, it is much faster than IsValidNumber().
+  //   3. For fixed line numbers, many regions have the concept of area code,
+  //      which together with subscriber number constitute the national
+  //      significant number. It is sometimes okay to dial the subscriber
+  //      number only when dialing in the same area. This function will return
+  //      true if the subscriber-number-only version is passed in. On the other
+  //      hand, because IsValidNumber() validates using information on both
+  //      starting digits (for fixed line numbers, that would most likely be
+  //      area codes) and length (obviously includes the length of area codes
+  //      for fixed line numbers), it will return false for the
+  //      subscriber-number-only version.
+  ValidationResult IsPossibleNumberWithReason(const PhoneNumber& number) const;
+
+  // Convenience wrapper around IsPossibleNumberWithReason. Instead of returning
+  // the reason for failure, this method returns a boolean value.
+  bool IsPossibleNumber(const PhoneNumber& number) const;
+
+  // Checks whether a phone number is a possible number given a number in the
+  // form of a string, and the country where the number could be dialed from.
+  // It provides a more lenient check than IsValidNumber(). See
+  // IsPossibleNumber(const PhoneNumber& number) for details.
+  //
+  // This method first parses the number, then invokes
+  // IsPossibleNumber(const PhoneNumber& number) with the resultant PhoneNumber
+  // object.
+  //
+  // region_dialing_from represents the region that we are expecting the number
+  // to be dialed from. Note this is different from the region where the number
+  // belongs. For example, the number +1 650 253 0000 is a number that belongs
+  // to US. When written in this form, it could be dialed from any region. When
+  // it is written as 00 1 650 253 0000, it could be dialed from any region
+  // which uses an international dialling prefix of 00. When it is written as
+  // 650 253 0000, it could only be dialed from within the US, and when written
+  // as 253 0000, it could only be dialed from within a smaller area in the US
+  // (Mountain View, CA, to be more specific).
+  //
+  // The country_dialing_from parameter is an ISO 3166-1 two-letter country code
+  // string.
+  bool IsPossibleNumberForString(
+      const string& number,
+      const string& country_dialing_from) const;
+
+  // Gets a valid fixed-line number for the specified region. Returns false if
+  // the region was unknown.
+  bool GetExampleNumber(const string& region_code,
+                        PhoneNumber* number) const;
+
+  // Gets a valid number of the specified type for the specified region.
+  // Returns false if the region was unknown or if no example number of that
+  // type could be found.
+  //
+  // The region_code parameter is an ISO 3166-1 two-letter country code string.
+  bool GetExampleNumberForType(const string& region_code,
+                               PhoneNumberType type,
+                               PhoneNumber* number) const;
+
+  // Parses a string and returns it in proto buffer format. This method will
+  // return an error like INVALID_COUNTRY_CODE if the number is not considered
+  // to be a possible number, and NO_PARSING_ERROR if it parsed correctly. Note
+  // that validation of whether the number is actually a valid number for a
+  // particular region is not performed. This can be done separately with
+  // IsValidNumber().
+  //
+  // default_region represents the country that we are expecting the number to
+  // be from. This is only used if the number being parsed is not written in
+  // international format. The country_code for the number in this case would be
+  // stored as that of the default country supplied. If the number is guaranteed
+  // to start with a '+' followed by the country calling code, then
+  // "ZZ" can be supplied.
+  //
+  // The default_country parameter is an ISO 3166-1 two-letter country code
+  // string.
+  ErrorType Parse(const string& number_to_parse,
+                  const string& default_country,
+                  PhoneNumber* number) const;
+  // Parses a string and returns it in proto buffer format. This method differs
+  // from Parse() in that it always populates the raw_input field of the
+  // protocol buffer with number_to_parse as well as the country_code_source
+  // field.
+  //
+  // The default_country parameter is an ISO 3166-1 two-letter country code
+  // string.
+  ErrorType ParseAndKeepRawInput(const string& number_to_parse,
+                                 const string& default_country,
+                                 PhoneNumber* number) const;
+
+  // Takes two phone numbers and compares them for equality.
+  //
+  // Returns EXACT_MATCH if the country calling code, NSN, presence of a leading
+  // zero for Italian numbers and any extension present are the same.
+  // Returns NSN_MATCH if either or both has no country calling code specified,
+  // and the NSNs and extensions are the same.
+  // Returns SHORT_NSN_MATCH if either or both has no country calling code
+  // specified, or the country calling code specified is the same, and one NSN
+  // could be a shorter version of the other number. This includes the case
+  // where one has an extension specified, and the other does not.
+  // Returns NO_MATCH otherwise.
+  // For example, the numbers +1 345 657 1234 and 657 1234 are a
+  // SHORT_NSN_MATCH. The numbers +1 345 657 1234 and 345 657 are a NO_MATCH.
+  MatchType IsNumberMatch(const PhoneNumber& first_number,
+                          const PhoneNumber& second_number) const;
+
+  // Takes two phone numbers as strings and compares them for equality. This
+  // is a convenience wrapper for IsNumberMatch(PhoneNumber firstNumber,
+  // PhoneNumber secondNumber). No default region is known.
+  // Returns INVALID_NUMBER if either number cannot be parsed into a phone
+  // number.
+  MatchType IsNumberMatchWithTwoStrings(const string& first_number,
+                                        const string& second_number) const;
+
+  // Takes two phone numbers and compares them for equality. This is a
+  // convenience wrapper for IsNumberMatch(PhoneNumber firstNumber,
+  // PhoneNumber secondNumber). No default region is known.
+  // Returns INVALID_NUMBER if second_number cannot be parsed into a phone
+  // number.
+  MatchType IsNumberMatchWithOneString(const PhoneNumber& first_number,
+                                       const string& second_number) const;
+
+  // Implement this 'interface' to override the way metadatas are fetched.
+  // Useful for testing injecting stable metadatas.
+  class MetadataProvider {
+   public:
+     virtual ~MetadataProvider() {}
+
+     // Returns a pair containing a pointer to the data and its size
+     virtual pair<const void*, unsigned> operator()() = 0;
+  };
+
+  // Override the default logging system. The provided adapter destruction is
+  // handled by this class (don't delete it).
+  static void SetLoggerAdapter(LoggerAdapter* logger_adapter);
+
+  friend bool ConvertFromTelephoneNumberProto(
+      const TelephoneNumber& proto_to_convert,
+      PhoneNumber* new_proto);
+  friend bool ConvertToTelephoneNumberProto(const PhoneNumber& proto_to_convert,
+                                            TelephoneNumber* resulting_proto);
+
+ protected:
+  // Check whether the country_calling_code is from a country whose national
+  // significant number could contain a leading zero. An example of such a
+  // country is Italy.
+  bool IsLeadingZeroPossible(int country_calling_code) const;
+
+ private:
+  typedef pair<int, list<string>*> IntRegionsPair;
+
+  // The minimum and maximum length of the national significant number.
+  static const size_t kMinLengthForNsn = 3;
+  static const size_t kMaxLengthForNsn = 15;
+
+  // A mapping from a country calling code to a region code which denotes the
+  // region represented by that country calling code. Note countries under
+  // NANPA share the country calling code 1 and Russia and Kazakhstan share the
+  // country calling code 7. Under this map, 1 is mapped to region code "US" and
+  // 7 is mapped to region code "RU". This is implemented as a sorted vector to
+  // achieve better performance.
+  //
+  // Region codes are ISO 3166-1 two-letter country code strings.
+  scoped_ptr<vector<IntRegionsPair> > country_calling_code_to_region_code_map_;
+
+  struct CompareFirst {
+    bool operator()(const IntRegionsPair& p1,
+                    const IntRegionsPair& p2) const {
+      return p1.first < p2.first;
+    }
+  };
+
+  // The set of regions that share country calling code 1.
+  scoped_ptr<set<string> > nanpa_regions_;
+  static const int kNanpaCountryCode = 1;
+
+  // A mapping from a region code to a PhoneMetadata for that region.
+  // Region codes are ISO 3166-1 two-letter country code strings.
+  scoped_ptr<map<string, PhoneMetadata> > region_to_metadata_map_;
+
+  bool LoadMetadata(PhoneMetadataCollection* metadata,
+                    MetadataProvider& provider);
+
+  explicit PhoneNumberUtil(MetadataProvider* provider = 0);
+  ~PhoneNumberUtil();
+
+  // Gets all the supported regions.
+  void GetSupportedRegions(set<string>* regions) const;
+
+  // Returns the national dialling prefix for a specific region. For example,
+  // this would be 1 for the United States, and 0 for New Zealand. Set
+  // stripNonDigits to true to strip symbols like "~" (which indicates a wait
+  // for a dialling tone) from the prefix returned. If no national prefix is
+  // present, we return an empty string.
+  //
+  // Set strip_non_digits to true to strip non-digits from the national
+  // dialling prefix.
+  void GetNddPrefixForRegion(const string& region_code,
+                             bool strip_non_digits,
+                             string* national_prefix) const;
+
+  // Helper function to check region code is not unknown or null.
+  //
+  // The region_code parameter is an ISO 3166-1 two-letter country code string.
+  bool IsValidRegionCode(const string& region_code) const;
+
+  // Helper function to check region code is not unknown. The
+  // country_calling_code and number supplied is used only for the resultant log
+  // message.
+  //
+  // The region_code parameter is an ISO 3166-1 two-letter country code string.
+  bool HasValidRegionCode(const string& region_code,
+                          int country_code,
+                          const string& number) const;
+
+  // The region_code parameter is an ISO 3166-1 two-letter country code string.
+  const i18n::phonenumbers::PhoneMetadata* GetMetadataForRegion(
+      const string& region_code) const;
+
+  void GetRegionCodesForCountryCallingCode(
+      int country_calling_code,
+      list<string>* region_codes) const;
+
+  // Simple wrapper of FormatNationalNumberWithCarrier for the common case of
+  // no carrier code.
+  //
+  // The region_code parameter is an ISO 3166-1 two-letter country code string.
+  void FormatNationalNumber(const string& number,
+                            const string& region_code,
+                            PhoneNumberFormat number_format,
+                            string* formatted_number) const;
+
+  // The region_code parameter is an ISO 3166-1 two-letter country code string.
+  void FormatNationalNumberWithCarrier(const string& number,
+                                       const string& region_code,
+                                       PhoneNumberFormat number_format,
+                                       const string& carrier_code,
+                                       string* formatted_number) const;
+
+  // The region_code parameter is an ISO 3166-1 two-letter country code string.
+  void MaybeGetFormattedExtension(
+      const PhoneNumber& number,
+      const string& region_code,
+      PhoneNumberFormat number_format,
+      string* extension) const;
+
+  // The region_code parameter is an ISO 3166-1 two-letter country code string.
+  void FormatExtension(const string& extension_digits,
+                       const string& region_code,
+                       string* extension) const;
+
+  void GetRegionCodeForNumberFromRegionList(
+      const PhoneNumber& number,
+      const list<string>& region_codes,
+      string* region_code) const;
+
+  void Normalize(string* number) const;
+  PhoneNumber::CountryCodeSource MaybeStripInternationalPrefixAndNormalize(
+      const string& possible_idd_prefix,
+      string* number) const;
+
+  static void MaybeStripNationalPrefixAndCarrierCode(
+      const PhoneMetadata& metadata,
+      string* number,
+      string* carrier_code);
+
+  static void ExtractPossibleNumber(const string& number,
+                                    string* extracted_number);
+
+  static bool IsViablePhoneNumber(const string& number);
+
+  static bool MaybeStripExtension(string* number, string* extension);
+
+  int ExtractCountryCode(string* national_number) const;
+  ErrorType MaybeExtractCountryCode(
+      const PhoneMetadata* default_region_metadata,
+      bool keepRawInput,
+      string* national_number,
+      PhoneNumber* phone_number) const;
+
+  // The default_region parameter is an ISO 3166-1 two-letter country code
+  // string.
+  bool CheckRegionForParsing(
+      const string& number_to_parse,
+      const string& default_region) const;
+
+  // The default_region parameter is an ISO 3166-1 two-letter country code
+  // string.
+  ErrorType ParseHelper(const string& number_to_parse,
+                        const string& default_region,
+                        bool keep_raw_input,
+                        bool check_region,
+                        PhoneNumber* phone_number) const;
+
+  DISALLOW_COPY_AND_ASSIGN(PhoneNumberUtil);
+};
+
+}  // namespace phonenumbers
+}  // namespace i18n
+
+#endif  // I18N_PHONENUMBERS_PHONENUMBERUTIL_H_