libutils/include/utils/String8.h - android-core - Git at Google

 /*
  * Copyright (C) 2005 The Android Open Source Project
  *
  * 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.
  */

 #ifndef ANDROID_STRING8_H
 #define ANDROID_STRING8_H

 #include <string> // for std::string

 #include <utils/Errors.h>
 #include <utils/Unicode.h>
 #include <utils/TypeHelpers.h>

 #include <string.h> // for strcmp
 #include <stdarg.h>

 // ---------------------------------------------------------------------------

 namespace android {

 class String16;
 class TextOutput;

 //! This is a string holding UTF-8 characters. Does not allow the value more
 // than 0x10FFFF, which is not valid unicode codepoint.
 class String8
 {
 public:
     /* use String8(StaticLinkage) if you're statically linking against
      * libutils and declaring an empty static String8, e.g.:
      *
      *   static String8 sAStaticEmptyString(String8::kEmptyString);
      *   static String8 sAnotherStaticEmptyString(sAStaticEmptyString);
      */
     enum StaticLinkage { kEmptyString };

                                 String8();
     explicit                    String8(StaticLinkage);
                                 String8(const String8& o);
     explicit                    String8(const char* o);
     explicit                    String8(const char* o, size_t numChars);

     explicit                    String8(const String16& o);
     explicit                    String8(const char16_t* o);
     explicit                    String8(const char16_t* o, size_t numChars);
     explicit                    String8(const char32_t* o);
     explicit                    String8(const char32_t* o, size_t numChars);
                                 ~String8();

     static inline const String8 empty();

     static String8              format(const char* fmt, ...) __attribute__((format (printf, 1, 2)));
     static String8              formatV(const char* fmt, va_list args);

     inline  const char*         c_str() const;
     inline  const char*         string() const;

 // TODO(b/35363681): remove
 private:
     static inline std::string   std_string(const String8& str);
 public:

     inline  size_t              size() const;
     inline  size_t              bytes() const;
     inline  bool                isEmpty() const;

             size_t              length() const;

             void                clear();

             void                setTo(const String8& other);
             status_t            setTo(const char* other);
             status_t            setTo(const char* other, size_t numChars);
             status_t            setTo(const char16_t* other, size_t numChars);
             status_t            setTo(const char32_t* other,
                                       size_t length);

             status_t            append(const String8& other);
             status_t            append(const char* other);
             status_t            append(const char* other, size_t numChars);

             status_t            appendFormat(const char* fmt, ...)
                     __attribute__((format (printf, 2, 3)));
             status_t            appendFormatV(const char* fmt, va_list args);

             // Note that this function takes O(N) time to calculate the value.
             // No cache value is stored.
             size_t              getUtf32Length() const;
             int32_t             getUtf32At(size_t index,
                                            size_t *next_index) const;
             void                getUtf32(char32_t* dst) const;

     inline  String8&            operator=(const String8& other);
     inline  String8&            operator=(const char* other);

     inline  String8&            operator+=(const String8& other);
     inline  String8             operator+(const String8& other) const;

     inline  String8&            operator+=(const char* other);
     inline  String8             operator+(const char* other) const;

     inline  int                 compare(const String8& other) const;

     inline  bool                operator<(const String8& other) const;
     inline  bool                operator<=(const String8& other) const;
     inline  bool                operator==(const String8& other) const;
     inline  bool                operator!=(const String8& other) const;
     inline  bool                operator>=(const String8& other) const;
     inline  bool                operator>(const String8& other) const;

     inline  bool                operator<(const char* other) const;
     inline  bool                operator<=(const char* other) const;
     inline  bool                operator==(const char* other) const;
     inline  bool                operator!=(const char* other) const;
     inline  bool                operator>=(const char* other) const;
     inline  bool                operator>(const char* other) const;

     inline                      operator const char*() const;

             char*               lockBuffer(size_t size);
             void                unlockBuffer();
             status_t            unlockBuffer(size_t size);

             // return the index of the first byte of other in this at or after
             // start, or -1 if not found
             ssize_t             find(const char* other, size_t start = 0) const;

             // return true if this string contains the specified substring
     inline  bool                contains(const char* other) const;

             // removes all occurrence of the specified substring
             // returns true if any were found and removed
             bool                removeAll(const char* other);

             void                toLower();
             void                toLower(size_t start, size_t numChars);
             void                toUpper();
             void                toUpper(size_t start, size_t numChars);


     /*
      * These methods operate on the string as if it were a path name.
      */

     /*
      * Set the filename field to a specific value.
      *
      * Normalizes the filename, removing a trailing '/' if present.
      */
     void setPathName(const char* name);
     void setPathName(const char* name, size_t numChars);

     /*
      * Get just the filename component.
      *
      * "/tmp/foo/bar.c" --> "bar.c"
      */
     String8 getPathLeaf(void) const;

     /*
      * Remove the last (file name) component, leaving just the directory
      * name.
      *
      * "/tmp/foo/bar.c" --> "/tmp/foo"
      * "/tmp" --> "" // ????? shouldn't this be "/" ???? XXX
      * "bar.c" --> ""
      */
     String8 getPathDir(void) const;

     /*
      * Retrieve the front (root dir) component.  Optionally also return the
      * remaining components.
      *
      * "/tmp/foo/bar.c" --> "tmp" (remain = "foo/bar.c")
      * "/tmp" --> "tmp" (remain = "")
      * "bar.c" --> "bar.c" (remain = "")
      */
     String8 walkPath(String8* outRemains = NULL) const;

     /*
      * Return the filename extension.  This is the last '.' and any number
      * of characters that follow it.  The '.' is included in case we
      * decide to expand our definition of what constitutes an extension.
      *
      * "/tmp/foo/bar.c" --> ".c"
      * "/tmp" --> ""
      * "/tmp/foo.bar/baz" --> ""
      * "foo.jpeg" --> ".jpeg"
      * "foo." --> ""
      */
     String8 getPathExtension(void) const;

     /*
      * Return the path without the extension.  Rules for what constitutes
      * an extension are described in the comment for getPathExtension().
      *
      * "/tmp/foo/bar.c" --> "/tmp/foo/bar"
      */
     String8 getBasePath(void) const;

     /*
      * Add a component to the pathname.  We guarantee that there is
      * exactly one path separator between the old path and the new.
      * If there is no existing name, we just copy the new name in.
      *
      * If leaf is a fully qualified path (i.e. starts with '/', it
      * replaces whatever was there before.
      */
     String8& appendPath(const char* leaf);
     String8& appendPath(const String8& leaf)  { return appendPath(leaf.string()); }

     /*
      * Like appendPath(), but does not affect this string.  Returns a new one instead.
      */
     String8 appendPathCopy(const char* leaf) const
                                              { String8 p(*this); p.appendPath(leaf); return p; }
     String8 appendPathCopy(const String8& leaf) const { return appendPathCopy(leaf.string()); }

     /*
      * Converts all separators in this string to /, the default path separator.
      *
      * If the default OS separator is backslash, this converts all
      * backslashes to slashes, in-place. Otherwise it does nothing.
      * Returns self.
      */
     String8& convertToResPath();

 private:
             status_t            real_append(const char* other, size_t numChars);
             char*               find_extension(void) const;

             const char* mString;
 };

 // String8 can be trivially moved using memcpy() because moving does not
 // require any change to the underlying SharedBuffer contents or reference count.
 ANDROID_TRIVIAL_MOVE_TRAIT(String8)

 // ---------------------------------------------------------------------------
 // No user servicable parts below.

 inline int compare_type(const String8& lhs, const String8& rhs)
 {
     return lhs.compare(rhs);
 }

 inline int strictly_order_type(const String8& lhs, const String8& rhs)
 {
     return compare_type(lhs, rhs) < 0;
 }

 inline const String8 String8::empty() {
     return String8();
 }

 inline const char* String8::c_str() const
 {
     return mString;
 }
 inline const char* String8::string() const
 {
     return mString;
 }

 inline std::string String8::std_string(const String8& str)
 {
     return std::string(str.string());
 }

 inline size_t String8::size() const
 {
     return length();
 }

 inline bool String8::isEmpty() const
 {
     return length() == 0;
 }

 inline size_t String8::bytes() const
 {
     return length();
 }

 inline bool String8::contains(const char* other) const
 {
     return find(other) >= 0;
 }

 inline String8& String8::operator=(const String8& other)
 {
     setTo(other);
     return *this;
 }

 inline String8& String8::operator=(const char* other)
 {
     setTo(other);
     return *this;
 }

 inline String8& String8::operator+=(const String8& other)
 {
     append(other);
     return *this;
 }

 inline String8 String8::operator+(const String8& other) const
 {
     String8 tmp(*this);
     tmp += other;
     return tmp;
 }

 inline String8& String8::operator+=(const char* other)
 {
     append(other);
     return *this;
 }

 inline String8 String8::operator+(const char* other) const
 {
     String8 tmp(*this);
     tmp += other;
     return tmp;
 }

 inline int String8::compare(const String8& other) const
 {
     return strcmp(mString, other.mString);
 }

 inline bool String8::operator<(const String8& other) const
 {
     return strcmp(mString, other.mString) < 0;
 }

 inline bool String8::operator<=(const String8& other) const
 {
     return strcmp(mString, other.mString) <= 0;
 }

 inline bool String8::operator==(const String8& other) const
 {
     return strcmp(mString, other.mString) == 0;
 }

 inline bool String8::operator!=(const String8& other) const
 {
     return strcmp(mString, other.mString) != 0;
 }

 inline bool String8::operator>=(const String8& other) const
 {
     return strcmp(mString, other.mString) >= 0;
 }

 inline bool String8::operator>(const String8& other) const
 {
     return strcmp(mString, other.mString) > 0;
 }

 inline bool String8::operator<(const char* other) const
 {
     return strcmp(mString, other) < 0;
 }

 inline bool String8::operator<=(const char* other) const
 {
     return strcmp(mString, other) <= 0;
 }

 inline bool String8::operator==(const char* other) const
 {
     return strcmp(mString, other) == 0;
 }

 inline bool String8::operator!=(const char* other) const
 {
     return strcmp(mString, other) != 0;
 }

 inline bool String8::operator>=(const char* other) const
 {
     return strcmp(mString, other) >= 0;
 }

 inline bool String8::operator>(const char* other) const
 {
     return strcmp(mString, other) > 0;
 }

 inline String8::operator const char*() const
 {
     return mString;
 }

 }  // namespace android

 // ---------------------------------------------------------------------------

 #endif // ANDROID_STRING8_H
	/*
	* Copyright (C) 2005 The Android Open Source Project
	*
	* 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.
	*/

	#ifndef ANDROID_STRING8_H
	#define ANDROID_STRING8_H

	#include <string> // for std::string

	#include <utils/Errors.h>
	#include <utils/Unicode.h>
	#include <utils/TypeHelpers.h>

	#include <string.h> // for strcmp
	#include <stdarg.h>

	// ---------------------------------------------------------------------------

	namespace android {

	class String16;
	class TextOutput;

	//! This is a string holding UTF-8 characters. Does not allow the value more
	// than 0x10FFFF, which is not valid unicode codepoint.
	class String8
	{
	public:
	/* use String8(StaticLinkage) if you're statically linking against
	* libutils and declaring an empty static String8, e.g.:
	*
	* static String8 sAStaticEmptyString(String8::kEmptyString);
	* static String8 sAnotherStaticEmptyString(sAStaticEmptyString);
	*/
	enum StaticLinkage { kEmptyString };

	String8();
	explicit String8(StaticLinkage);
	String8(const String8& o);
	explicit String8(const char* o);
	explicit String8(const char* o, size_t numChars);

	explicit String8(const String16& o);
	explicit String8(const char16_t* o);
	explicit String8(const char16_t* o, size_t numChars);
	explicit String8(const char32_t* o);
	explicit String8(const char32_t* o, size_t numChars);
	~String8();

	static inline const String8 empty();

	static String8 format(const char* fmt, ...) __attribute__((format (printf, 1, 2)));
	static String8 formatV(const char* fmt, va_list args);

	inline const char* c_str() const;
	inline const char* string() const;

	// TODO(b/35363681): remove
	private:
	static inline std::string std_string(const String8& str);
	public:

	inline size_t size() const;
	inline size_t bytes() const;
	inline bool isEmpty() const;

	size_t length() const;

	void clear();

	void setTo(const String8& other);
	status_t setTo(const char* other);
	status_t setTo(const char* other, size_t numChars);
	status_t setTo(const char16_t* other, size_t numChars);
	status_t setTo(const char32_t* other,
	size_t length);

	status_t append(const String8& other);
	status_t append(const char* other);
	status_t append(const char* other, size_t numChars);

	status_t appendFormat(const char* fmt, ...)
	__attribute__((format (printf, 2, 3)));
	status_t appendFormatV(const char* fmt, va_list args);

	// Note that this function takes O(N) time to calculate the value.
	// No cache value is stored.
	size_t getUtf32Length() const;
	int32_t getUtf32At(size_t index,
	size_t *next_index) const;
	void getUtf32(char32_t* dst) const;

	inline String8& operator=(const String8& other);
	inline String8& operator=(const char* other);

	inline String8& operator+=(const String8& other);
	inline String8 operator+(const String8& other) const;

	inline String8& operator+=(const char* other);
	inline String8 operator+(const char* other) const;

	inline int compare(const String8& other) const;

	inline bool operator<(const String8& other) const;
	inline bool operator<=(const String8& other) const;
	inline bool operator==(const String8& other) const;
	inline bool operator!=(const String8& other) const;
	inline bool operator>=(const String8& other) const;
	inline bool operator>(const String8& other) const;

	inline bool operator<(const char* other) const;
	inline bool operator<=(const char* other) const;
	inline bool operator==(const char* other) const;
	inline bool operator!=(const char* other) const;
	inline bool operator>=(const char* other) const;
	inline bool operator>(const char* other) const;

	inline operator const char*() const;

	char* lockBuffer(size_t size);
	void unlockBuffer();
	status_t unlockBuffer(size_t size);

	// return the index of the first byte of other in this at or after
	// start, or -1 if not found
	ssize_t find(const char* other, size_t start = 0) const;

	// return true if this string contains the specified substring
	inline bool contains(const char* other) const;

	// removes all occurrence of the specified substring
	// returns true if any were found and removed
	bool removeAll(const char* other);

	void toLower();
	void toLower(size_t start, size_t numChars);
	void toUpper();
	void toUpper(size_t start, size_t numChars);


	/*
	* These methods operate on the string as if it were a path name.
	*/

	/*
	* Set the filename field to a specific value.
	*
	* Normalizes the filename, removing a trailing '/' if present.
	*/
	void setPathName(const char* name);
	void setPathName(const char* name, size_t numChars);

	/*
	* Get just the filename component.
	*
	* "/tmp/foo/bar.c" --> "bar.c"
	*/
	String8 getPathLeaf(void) const;

	/*
	* Remove the last (file name) component, leaving just the directory
	* name.
	*
	* "/tmp/foo/bar.c" --> "/tmp/foo"
	* "/tmp" --> "" // ????? shouldn't this be "/" ???? XXX
	* "bar.c" --> ""
	*/
	String8 getPathDir(void) const;

	/*
	* Retrieve the front (root dir) component. Optionally also return the
	* remaining components.
	*
	* "/tmp/foo/bar.c" --> "tmp" (remain = "foo/bar.c")
	* "/tmp" --> "tmp" (remain = "")
	* "bar.c" --> "bar.c" (remain = "")
	*/
	String8 walkPath(String8* outRemains = NULL) const;

	/*
	* Return the filename extension. This is the last '.' and any number
	* of characters that follow it. The '.' is included in case we
	* decide to expand our definition of what constitutes an extension.
	*
	* "/tmp/foo/bar.c" --> ".c"
	* "/tmp" --> ""
	* "/tmp/foo.bar/baz" --> ""
	* "foo.jpeg" --> ".jpeg"
	* "foo." --> ""
	*/
	String8 getPathExtension(void) const;

	/*
	* Return the path without the extension. Rules for what constitutes
	* an extension are described in the comment for getPathExtension().
	*
	* "/tmp/foo/bar.c" --> "/tmp/foo/bar"
	*/
	String8 getBasePath(void) const;

	/*
	* Add a component to the pathname. We guarantee that there is
	* exactly one path separator between the old path and the new.
	* If there is no existing name, we just copy the new name in.
	*
	* If leaf is a fully qualified path (i.e. starts with '/', it
	* replaces whatever was there before.
	*/
	String8& appendPath(const char* leaf);
	String8& appendPath(const String8& leaf) { return appendPath(leaf.string()); }

	/*
	* Like appendPath(), but does not affect this string. Returns a new one instead.
	*/
	String8 appendPathCopy(const char* leaf) const
	{ String8 p(*this); p.appendPath(leaf); return p; }
	String8 appendPathCopy(const String8& leaf) const { return appendPathCopy(leaf.string()); }

	/*
	* Converts all separators in this string to /, the default path separator.
	*
	* If the default OS separator is backslash, this converts all
	* backslashes to slashes, in-place. Otherwise it does nothing.
	* Returns self.
	*/
	String8& convertToResPath();

	private:
	status_t real_append(const char* other, size_t numChars);
	char* find_extension(void) const;

	const char* mString;
	};

	// String8 can be trivially moved using memcpy() because moving does not
	// require any change to the underlying SharedBuffer contents or reference count.
	ANDROID_TRIVIAL_MOVE_TRAIT(String8)

	// ---------------------------------------------------------------------------
	// No user servicable parts below.

	inline int compare_type(const String8& lhs, const String8& rhs)
	{
	return lhs.compare(rhs);
	}

	inline int strictly_order_type(const String8& lhs, const String8& rhs)
	{
	return compare_type(lhs, rhs) < 0;
	}

	inline const String8 String8::empty() {
	return String8();
	}

	inline const char* String8::c_str() const
	{
	return mString;
	}
	inline const char* String8::string() const
	{
	return mString;
	}

	inline std::string String8::std_string(const String8& str)
	{
	return std::string(str.string());
	}

	inline size_t String8::size() const
	{
	return length();
	}

	inline bool String8::isEmpty() const
	{
	return length() == 0;
	}

	inline size_t String8::bytes() const
	{
	return length();
	}

	inline bool String8::contains(const char* other) const
	{
	return find(other) >= 0;
	}

	inline String8& String8::operator=(const String8& other)
	{
	setTo(other);
	return *this;
	}

	inline String8& String8::operator=(const char* other)
	{
	setTo(other);
	return *this;
	}

	inline String8& String8::operator+=(const String8& other)
	{
	append(other);
	return *this;
	}

	inline String8 String8::operator+(const String8& other) const
	{
	String8 tmp(*this);
	tmp += other;
	return tmp;
	}

	inline String8& String8::operator+=(const char* other)
	{
	append(other);
	return *this;
	}

	inline String8 String8::operator+(const char* other) const
	{
	String8 tmp(*this);
	tmp += other;
	return tmp;
	}

	inline int String8::compare(const String8& other) const
	{
	return strcmp(mString, other.mString);
	}

	inline bool String8::operator<(const String8& other) const
	{
	return strcmp(mString, other.mString) < 0;
	}

	inline bool String8::operator<=(const String8& other) const
	{
	return strcmp(mString, other.mString) <= 0;
	}

	inline bool String8::operator==(const String8& other) const
	{
	return strcmp(mString, other.mString) == 0;
	}

	inline bool String8::operator!=(const String8& other) const
	{
	return strcmp(mString, other.mString) != 0;
	}

	inline bool String8::operator>=(const String8& other) const
	{
	return strcmp(mString, other.mString) >= 0;
	}

	inline bool String8::operator>(const String8& other) const
	{
	return strcmp(mString, other.mString) > 0;
	}

	inline bool String8::operator<(const char* other) const
	{
	return strcmp(mString, other) < 0;
	}

	inline bool String8::operator<=(const char* other) const
	{
	return strcmp(mString, other) <= 0;
	}

	inline bool String8::operator==(const char* other) const
	{
	return strcmp(mString, other) == 0;
	}

	inline bool String8::operator!=(const char* other) const
	{
	return strcmp(mString, other) != 0;
	}

	inline bool String8::operator>=(const char* other) const
	{
	return strcmp(mString, other) >= 0;
	}

	inline bool String8::operator>(const char* other) const
	{
	return strcmp(mString, other) > 0;
	}

	inline String8::operator const char*() const
	{
	return mString;
	}

	} // namespace android

	// ---------------------------------------------------------------------------

	#endif // ANDROID_STRING8_H