googleurl/src/url_parse.h - platform/external/chromium - Git at Google

 // Copyright 2007, 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:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
 // in the documentation and/or other materials provided with the
 // distribution.
 //     * Neither the name of Google Inc. nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 #ifndef GOOGLEURL_SRC_URL_PARSE_H__
 #define GOOGLEURL_SRC_URL_PARSE_H__

 #include <string>

 #include "base/basictypes.h"
 #include "base/string16.h"
 #include "googleurl/src/url_common.h"

 namespace url_parse {

 // Deprecated, but WebKit/WebCore/platform/KURLGooglePrivate.h and
 // KURLGoogle.cpp still rely on this type.
 typedef char16 UTF16Char;

 // Component ------------------------------------------------------------------

 // Represents a substring for URL parsing.
 struct Component {
   Component() : begin(0), len(-1) {}

   // Normal constructor: takes an offset and a length.
   Component(int b, int l) : begin(b), len(l) {}

   int end() const {
     return begin + len;
   }

   // Returns true if this component is valid, meaning the length is given. Even
   // valid components may be empty to record the fact that they exist.
   bool is_valid() const {
     return (len != -1);
   }

   // Returns true if the given component is specified on false, the component
   // is either empty or invalid.
   bool is_nonempty() const {
     return (len > 0);
   }

   void reset() {
     begin = 0;
     len = -1;
   }

   bool operator==(const Component& other) const {
     return begin == other.begin && len == other.len;
   }

   int begin;  // Byte offset in the string of this component.
   int len;    // Will be -1 if the component is unspecified.
 };

 // Helper that returns a component created with the given begin and ending
 // points. The ending point is non-inclusive.
 inline Component MakeRange(int begin, int end) {
   return Component(begin, end - begin);
 }

 // Parsed ---------------------------------------------------------------------

 // A structure that holds the identified parts of an input URL. This structure
 // does NOT store the URL itself. The caller will have to store the URL text
 // and its corresponding Parsed structure separately.
 //
 // Typical usage would be:
 //
 //    url_parse::Parsed parsed;
 //    url_parse::Component scheme;
 //    if (!url_parse::ExtractScheme(url, url_len, &scheme))
 //      return I_CAN_NOT_FIND_THE_SCHEME_DUDE;
 //
 //    if (IsStandardScheme(url, scheme))  // Not provided by this component
 //      url_parseParseStandardURL(url, url_len, &parsed);
 //    else if (IsFileURL(url, scheme))    // Not provided by this component
 //      url_parse::ParseFileURL(url, url_len, &parsed);
 //    else
 //      url_parse::ParsePathURL(url, url_len, &parsed);
 //
 struct Parsed {
   // Identifies different components.
   enum ComponentType {
     SCHEME,
     USERNAME,
     PASSWORD,
     HOST,
     PORT,
     PATH,
     QUERY,
     REF,
   };

   // The default constructor is sufficient for the components.
   GURL_API Parsed();

   // Returns the length of the URL (the end of the last component).
   //
   // Note that for some invalid, non-canonical URLs, this may not be the length
   // of the string. For example "http://": the parsed structure will only
   // contain an entry for the four-character scheme, and it doesn't know about
   // the "://". For all other last-components, it will return the real length.
   GURL_API int Length() const;

   // Returns the number of characters before the given component if it exists,
   // or where the component would be if it did exist. This will return the
   // string length if the component would be appended to the end.
   //
   // Note that this can get a little funny for the port, query, and ref
   // components which have a delimiter that is not counted as part of the
   // component. The |include_delimiter| flag controls if you want this counted
   // as part of the component or not when the component exists.
   //
   // This example shows the difference between the two flags for two of these
   // delimited components that is present (the port and query) and one that
   // isn't (the reference). The components that this flag affects are marked
   // with a *.
   //                 0         1         2
   //                 012345678901234567890
   // Example input:  http://foo:80/?query
   //              include_delim=true,  ...=false  ("<-" indicates different)
   //      SCHEME: 0                    0
   //    USERNAME: 5                    5
   //    PASSWORD: 5                    5
   //        HOST: 7                    7
   //       *PORT: 10                   11 <-
   //        PATH: 13                   13
   //      *QUERY: 14                   15 <-
   //        *REF: 20                   20
   //
   GURL_API int CountCharactersBefore(ComponentType type,
                                      bool include_delimiter) const;

   // Scheme without the colon: "http://foo"/ would have a scheme of "http".
   // The length will be -1 if no scheme is specified ("foo.com"), or 0 if there
   // is a colon but no scheme (":foo"). Note that the scheme is not guaranteed
   // to start at the beginning of the string if there are preceeding whitespace
   // or control characters.
   Component scheme;

   // Username. Specified in URLs with an @ sign before the host. See |password|
   Component username;

   // Password. The length will be -1 if unspecified, 0 if specified but empty.
   // Not all URLs with a username have a password, as in "http://me@host/".
   // The password is separated form the username with a colon, as in
   // "http://me:secret@host/"
   Component password;

   // Host name.
   Component host;

   // Port number.
   Component port;

   // Path, this is everything following the host name. Length will be -1 if
   // unspecified. This includes the preceeding slash, so the path on
   // http://www.google.com/asdf" is "/asdf". As a result, it is impossible to
   // have a 0 length path, it will be -1 in cases like "http://host?foo".
   // Note that we treat backslashes the same as slashes.
   Component path;

   // Stuff between the ? and the # after the path. This does not include the
   // preceeding ? character. Length will be -1 if unspecified, 0 if there is
   // a question mark but no query string.
   Component query;

   // Indicated by a #, this is everything following the hash sign (not
   // including it). If there are multiple hash signs, we'll use the last one.
   // Length will be -1 if there is no hash sign, or 0 if there is one but
   // nothing follows it.
   Component ref;
 };

 // Initialization functions ---------------------------------------------------
 //
 // These functions parse the given URL, filling in all of the structure's
 // components. These functions can not fail, they will always do their best
 // at interpreting the input given.
 //
 // The string length of the URL MUST be specified, we do not check for NULLs
 // at any point in the process, and will actually handle embedded NULLs.
 //
 // IMPORTANT: These functions do NOT hang on to the given pointer or copy it
 // in any way. See the comment above the struct.
 //
 // The 8-bit versions require UTF-8 encoding.

 // StandardURL is for when the scheme is known to be one that has an
 // authority (host) like "http". This function will not handle weird ones
 // like "about:" and "javascript:", or do the right thing for "file:" URLs.
 GURL_API void ParseStandardURL(const char* url, int url_len, Parsed* parsed);
 GURL_API void ParseStandardURL(const char16* url, int url_len, Parsed* parsed);

 // PathURL is for when the scheme is known not to have an authority (host)
 // section but that aren't file URLs either. The scheme is parsed, and
 // everything after the scheme is considered as the path. This is used for
 // things like "about:" and "javascript:"
 GURL_API void ParsePathURL(const char* url, int url_len, Parsed* parsed);
 GURL_API void ParsePathURL(const char16* url, int url_len, Parsed* parsed);

 // FileURL is for file URLs. There are some special rules for interpreting
 // these.
 GURL_API void ParseFileURL(const char* url, int url_len, Parsed* parsed);
 GURL_API void ParseFileURL(const char16* url, int url_len, Parsed* parsed);

 // MailtoURL is for mailto: urls. They are made up scheme,path,query
 GURL_API void ParseMailtoURL(const char* url, int url_len, Parsed* parsed);
 GURL_API void ParseMailtoURL(const char16* url, int url_len, Parsed* parsed);

 // Helper functions -----------------------------------------------------------

 // Locates the scheme according to the URL  parser's rules. This function is
 // designed so the caller can find the scheme and call the correct Init*
 // function according to their known scheme types.
 //
 // It also does not perform any validation on the scheme.
 //
 // This function will return true if the scheme is found and will put the
 // scheme's range into *scheme. False means no scheme could be found. Note
 // that a URL beginning with a colon has a scheme, but it is empty, so this
 // function will return true but *scheme will = (0,0).
 //
 // The scheme is found by skipping spaces and control characters at the
 // beginning, and taking everything from there to the first colon to be the
 // scheme. The character at scheme.end() will be the colon (we may enhance
 // this to handle full width colons or something, so don't count on the
 // actual character value). The character at scheme.end()+1 will be the
 // beginning of the rest of the URL, be it the authority or the path (or the
 // end of the string).
 //
 // The 8-bit version requires UTF-8 encoding.
 GURL_API bool ExtractScheme(const char* url, int url_len, Component* scheme);
 GURL_API bool ExtractScheme(const char16* url, int url_len, Component* scheme);

 // Returns true if ch is a character that terminates the authority segment
 // of a URL.
 GURL_API bool IsAuthorityTerminator(char16 ch);

 // Does a best effort parse of input |spec|, in range |auth|. If a particular
 // component is not found, it will be set to invalid.
 GURL_API void ParseAuthority(const char* spec,
                              const Component& auth,
                              Component* username,
                              Component* password,
                              Component* hostname,
                              Component* port_num);
 GURL_API void ParseAuthority(const char16* spec,
                              const Component& auth,
                              Component* username,
                              Component* password,
                              Component* hostname,
                              Component* port_num);

 // Computes the integer port value from the given port component. The port
 // component should have been identified by one of the init functions on
 // |Parsed| for the given input url.
 //
 // The return value will be a positive integer between 0 and 64K, or one of
 // the two special values below.
 enum SpecialPort { PORT_UNSPECIFIED = -1, PORT_INVALID = -2 };
 GURL_API int ParsePort(const char* url, const Component& port);
 GURL_API int ParsePort(const char16* url, const Component& port);

 // Extracts the range of the file name in the given url. The path must
 // already have been computed by the parse function, and the matching URL
 // and extracted path are provided to this function. The filename is
 // defined as being everything from the last slash/backslash of the path
 // to the end of the path.
 //
 // The file name will be empty if the path is empty or there is nothing
 // following the last slash.
 //
 // The 8-bit version requires UTF-8 encoding.
 GURL_API void ExtractFileName(const char* url,
                               const Component& path,
                               Component* file_name);
 GURL_API void ExtractFileName(const char16* url,
                               const Component& path,
                               Component* file_name);

 // Extract the first key/value from the range defined by |*query|. Updates
 // |*query| to start at the end of the extracted key/value pair. This is
 // designed for use in a loop: you can keep calling it with the same query
 // object and it will iterate over all items in the query.
 //
 // Some key/value pairs may have the key, the value, or both be empty (for
 // example, the query string "?&"). These will be returned. Note that an empty
 // last parameter "foo.com?" or foo.com?a&" will not be returned, this case
 // is the same as "done."
 //
 // The initial query component should not include the '?' (this is the default
 // for parsed URLs).
 //
 // If no key/value are found |*key| and |*value| will be unchanged and it will
 // return false.
 GURL_API bool ExtractQueryKeyValue(const char* url,
                                    Component* query,
                                    Component* key,
                                    Component* value);
 GURL_API bool ExtractQueryKeyValue(const char16* url,
                                    Component* query,
                                    Component* key,
                                    Component* value);

 }  // namespace url_parse

 #endif  // GOOGLEURL_SRC_URL_PARSE_H__
	// Copyright 2007, 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:
	//
	// * Redistributions of source code must retain the above copyright
	// notice, this list of conditions and the following disclaimer.
	// * Redistributions in binary form must reproduce the above
	// copyright notice, this list of conditions and the following disclaimer
	// in the documentation and/or other materials provided with the
	// distribution.
	// * Neither the name of Google Inc. nor the names of its
	// contributors may be used to endorse or promote products derived from
	// this software without specific prior written permission.
	//
	// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

	#ifndef GOOGLEURL_SRC_URL_PARSE_H__
	#define GOOGLEURL_SRC_URL_PARSE_H__

	#include <string>

	#include "base/basictypes.h"
	#include "base/string16.h"
	#include "googleurl/src/url_common.h"

	namespace url_parse {

	// Deprecated, but WebKit/WebCore/platform/KURLGooglePrivate.h and
	// KURLGoogle.cpp still rely on this type.
	typedef char16 UTF16Char;

	// Component ------------------------------------------------------------------

	// Represents a substring for URL parsing.
	struct Component {
	Component() : begin(0), len(-1) {}

	// Normal constructor: takes an offset and a length.
	Component(int b, int l) : begin(b), len(l) {}

	int end() const {
	return begin + len;
	}

	// Returns true if this component is valid, meaning the length is given. Even
	// valid components may be empty to record the fact that they exist.
	bool is_valid() const {
	return (len != -1);
	}

	// Returns true if the given component is specified on false, the component
	// is either empty or invalid.
	bool is_nonempty() const {
	return (len > 0);
	}

	void reset() {
	begin = 0;
	len = -1;
	}

	bool operator==(const Component& other) const {
	return begin == other.begin && len == other.len;
	}

	int begin; // Byte offset in the string of this component.
	int len; // Will be -1 if the component is unspecified.
	};

	// Helper that returns a component created with the given begin and ending
	// points. The ending point is non-inclusive.
	inline Component MakeRange(int begin, int end) {
	return Component(begin, end - begin);
	}

	// Parsed ---------------------------------------------------------------------

	// A structure that holds the identified parts of an input URL. This structure
	// does NOT store the URL itself. The caller will have to store the URL text
	// and its corresponding Parsed structure separately.
	//
	// Typical usage would be:
	//
	// url_parse::Parsed parsed;
	// url_parse::Component scheme;
	// if (!url_parse::ExtractScheme(url, url_len, &scheme))
	// return I_CAN_NOT_FIND_THE_SCHEME_DUDE;
	//
	// if (IsStandardScheme(url, scheme)) // Not provided by this component
	// url_parseParseStandardURL(url, url_len, &parsed);
	// else if (IsFileURL(url, scheme)) // Not provided by this component
	// url_parse::ParseFileURL(url, url_len, &parsed);
	// else
	// url_parse::ParsePathURL(url, url_len, &parsed);
	//
	struct Parsed {
	// Identifies different components.
	enum ComponentType {
	SCHEME,
	USERNAME,
	PASSWORD,
	HOST,
	PORT,
	PATH,
	QUERY,
	REF,
	};

	// The default constructor is sufficient for the components.
	GURL_API Parsed();

	// Returns the length of the URL (the end of the last component).
	//
	// Note that for some invalid, non-canonical URLs, this may not be the length
	// of the string. For example "http://": the parsed structure will only
	// contain an entry for the four-character scheme, and it doesn't know about
	// the "://". For all other last-components, it will return the real length.
	GURL_API int Length() const;

	// Returns the number of characters before the given component if it exists,
	// or where the component would be if it did exist. This will return the
	// string length if the component would be appended to the end.
	//
	// Note that this can get a little funny for the port, query, and ref
	// components which have a delimiter that is not counted as part of the
	// component. The \|include_delimiter\| flag controls if you want this counted
	// as part of the component or not when the component exists.
	//
	// This example shows the difference between the two flags for two of these
	// delimited components that is present (the port and query) and one that
	// isn't (the reference). The components that this flag affects are marked
	// with a *.
	// 0 1 2
	// 012345678901234567890
	// Example input: http://foo:80/?query
	// include_delim=true, ...=false ("<-" indicates different)
	// SCHEME: 0 0
	// USERNAME: 5 5
	// PASSWORD: 5 5
	// HOST: 7 7
	// *PORT: 10 11 <-
	// PATH: 13 13
	// *QUERY: 14 15 <-
	// *REF: 20 20
	//
	GURL_API int CountCharactersBefore(ComponentType type,
	bool include_delimiter) const;

	// Scheme without the colon: "http://foo"/ would have a scheme of "http".
	// The length will be -1 if no scheme is specified ("foo.com"), or 0 if there
	// is a colon but no scheme (":foo"). Note that the scheme is not guaranteed
	// to start at the beginning of the string if there are preceeding whitespace
	// or control characters.
	Component scheme;

	// Username. Specified in URLs with an @ sign before the host. See \|password\|
	Component username;

	// Password. The length will be -1 if unspecified, 0 if specified but empty.
	// Not all URLs with a username have a password, as in "http://me@host/".
	// The password is separated form the username with a colon, as in
	// "http://me:secret@host/"
	Component password;

	// Host name.
	Component host;

	// Port number.
	Component port;

	// Path, this is everything following the host name. Length will be -1 if
	// unspecified. This includes the preceeding slash, so the path on
	// http://www.google.com/asdf" is "/asdf". As a result, it is impossible to
	// have a 0 length path, it will be -1 in cases like "http://host?foo".
	// Note that we treat backslashes the same as slashes.
	Component path;

	// Stuff between the ? and the # after the path. This does not include the
	// preceeding ? character. Length will be -1 if unspecified, 0 if there is
	// a question mark but no query string.
	Component query;

	// Indicated by a #, this is everything following the hash sign (not
	// including it). If there are multiple hash signs, we'll use the last one.
	// Length will be -1 if there is no hash sign, or 0 if there is one but
	// nothing follows it.
	Component ref;
	};

	// Initialization functions ---------------------------------------------------
	//
	// These functions parse the given URL, filling in all of the structure's
	// components. These functions can not fail, they will always do their best
	// at interpreting the input given.
	//
	// The string length of the URL MUST be specified, we do not check for NULLs
	// at any point in the process, and will actually handle embedded NULLs.
	//
	// IMPORTANT: These functions do NOT hang on to the given pointer or copy it
	// in any way. See the comment above the struct.
	//
	// The 8-bit versions require UTF-8 encoding.

	// StandardURL is for when the scheme is known to be one that has an
	// authority (host) like "http". This function will not handle weird ones
	// like "about:" and "javascript:", or do the right thing for "file:" URLs.
	GURL_API void ParseStandardURL(const char* url, int url_len, Parsed* parsed);
	GURL_API void ParseStandardURL(const char16* url, int url_len, Parsed* parsed);

	// PathURL is for when the scheme is known not to have an authority (host)
	// section but that aren't file URLs either. The scheme is parsed, and
	// everything after the scheme is considered as the path. This is used for
	// things like "about:" and "javascript:"
	GURL_API void ParsePathURL(const char* url, int url_len, Parsed* parsed);
	GURL_API void ParsePathURL(const char16* url, int url_len, Parsed* parsed);

	// FileURL is for file URLs. There are some special rules for interpreting
	// these.
	GURL_API void ParseFileURL(const char* url, int url_len, Parsed* parsed);
	GURL_API void ParseFileURL(const char16* url, int url_len, Parsed* parsed);

	// MailtoURL is for mailto: urls. They are made up scheme,path,query
	GURL_API void ParseMailtoURL(const char* url, int url_len, Parsed* parsed);
	GURL_API void ParseMailtoURL(const char16* url, int url_len, Parsed* parsed);

	// Helper functions -----------------------------------------------------------

	// Locates the scheme according to the URL parser's rules. This function is
	// designed so the caller can find the scheme and call the correct Init*
	// function according to their known scheme types.
	//
	// It also does not perform any validation on the scheme.
	//
	// This function will return true if the scheme is found and will put the
	// scheme's range into *scheme. False means no scheme could be found. Note
	// that a URL beginning with a colon has a scheme, but it is empty, so this
	// function will return true but *scheme will = (0,0).
	//
	// The scheme is found by skipping spaces and control characters at the
	// beginning, and taking everything from there to the first colon to be the
	// scheme. The character at scheme.end() will be the colon (we may enhance
	// this to handle full width colons or something, so don't count on the
	// actual character value). The character at scheme.end()+1 will be the
	// beginning of the rest of the URL, be it the authority or the path (or the
	// end of the string).
	//
	// The 8-bit version requires UTF-8 encoding.
	GURL_API bool ExtractScheme(const char* url, int url_len, Component* scheme);
	GURL_API bool ExtractScheme(const char16* url, int url_len, Component* scheme);

	// Returns true if ch is a character that terminates the authority segment
	// of a URL.
	GURL_API bool IsAuthorityTerminator(char16 ch);

	// Does a best effort parse of input \|spec\|, in range \|auth\|. If a particular
	// component is not found, it will be set to invalid.
	GURL_API void ParseAuthority(const char* spec,
	const Component& auth,
	Component* username,
	Component* password,
	Component* hostname,
	Component* port_num);
	GURL_API void ParseAuthority(const char16* spec,
	const Component& auth,
	Component* username,
	Component* password,
	Component* hostname,
	Component* port_num);

	// Computes the integer port value from the given port component. The port
	// component should have been identified by one of the init functions on
	// \|Parsed\| for the given input url.
	//
	// The return value will be a positive integer between 0 and 64K, or one of
	// the two special values below.
	enum SpecialPort { PORT_UNSPECIFIED = -1, PORT_INVALID = -2 };
	GURL_API int ParsePort(const char* url, const Component& port);
	GURL_API int ParsePort(const char16* url, const Component& port);

	// Extracts the range of the file name in the given url. The path must
	// already have been computed by the parse function, and the matching URL
	// and extracted path are provided to this function. The filename is
	// defined as being everything from the last slash/backslash of the path
	// to the end of the path.
	//
	// The file name will be empty if the path is empty or there is nothing
	// following the last slash.
	//
	// The 8-bit version requires UTF-8 encoding.
	GURL_API void ExtractFileName(const char* url,
	const Component& path,
	Component* file_name);
	GURL_API void ExtractFileName(const char16* url,
	const Component& path,
	Component* file_name);

	// Extract the first key/value from the range defined by \|*query\|. Updates
	// \|*query\| to start at the end of the extracted key/value pair. This is
	// designed for use in a loop: you can keep calling it with the same query
	// object and it will iterate over all items in the query.
	//
	// Some key/value pairs may have the key, the value, or both be empty (for
	// example, the query string "?&"). These will be returned. Note that an empty
	// last parameter "foo.com?" or foo.com?a&" will not be returned, this case
	// is the same as "done."
	//
	// The initial query component should not include the '?' (this is the default
	// for parsed URLs).
	//
	// If no key/value are found \|key\| and \|value\| will be unchanged and it will
	// return false.
	GURL_API bool ExtractQueryKeyValue(const char* url,
	Component* query,
	Component* key,
	Component* value);
	GURL_API bool ExtractQueryKeyValue(const char16* url,
	Component* query,
	Component* key,
	Component* value);

	} // namespace url_parse

	#endif // GOOGLEURL_SRC_URL_PARSE_H__