206 lines
8.3 KiB
C++
206 lines
8.3 KiB
C++
/*
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WString.h - String library for Wiring & Arduino
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...mostly rewritten by Paul Stoffregen...
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Copyright (c) 2009-10 Hernando Barragan. All right reserved.
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Copyright 2011, Paul Stoffregen, paul@pjrc.com
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef String_class_h
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#define String_class_h
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#ifdef __cplusplus
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <avr/pgmspace.h>
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// When compiling programs with this class, the following gcc parameters
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// dramatically increase performance and memory (RAM) efficiency, typically
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// with little or no increase in code size.
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// -felide-constructors
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// -std=c++0x
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class __FlashStringHelper;
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#define F(string_literal) (reinterpret_cast<const __FlashStringHelper *>(PSTR(string_literal)))
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// An inherited class for holding the result of a concatenation. These
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// result objects are assumed to be writable by subsequent concatenations.
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class StringSumHelper;
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// The string class
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class String
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{
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// use a function pointer to allow for "if (s)" without the
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// complications of an operator bool(). for more information, see:
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// http://www.artima.com/cppsource/safebool.html
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typedef void (String::*StringIfHelperType)() const;
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void StringIfHelper() const {}
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public:
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// constructors
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// creates a copy of the initial value.
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// if the initial value is null or invalid, or if memory allocation
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// fails, the string will be marked as invalid (i.e. "if (s)" will
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// be false).
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String(const char *cstr = "");
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String(const String &str);
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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String(String &&rval);
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String(StringSumHelper &&rval);
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#endif
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explicit String(char c);
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explicit String(unsigned char, unsigned char base=10);
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explicit String(int, unsigned char base=10);
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explicit String(unsigned int, unsigned char base=10);
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explicit String(long, unsigned char base=10);
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explicit String(unsigned long, unsigned char base=10);
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~String(void);
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// memory management
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// return true on success, false on failure (in which case, the string
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// is left unchanged). reserve(0), if successful, will validate an
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// invalid string (i.e., "if (s)" will be true afterwards)
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unsigned char reserve(unsigned int size);
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inline unsigned int length(void) const {return len;}
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// creates a copy of the assigned value. if the value is null or
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// invalid, or if the memory allocation fails, the string will be
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// marked as invalid ("if (s)" will be false).
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String & operator = (const String &rhs);
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String & operator = (const char *cstr);
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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String & operator = (String &&rval);
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String & operator = (StringSumHelper &&rval);
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#endif
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// concatenate (works w/ built-in types)
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// returns true on success, false on failure (in which case, the string
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// is left unchanged). if the argument is null or invalid, the
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// concatenation is considered unsucessful.
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unsigned char concat(const String &str);
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unsigned char concat(const char *cstr);
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unsigned char concat(char c);
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unsigned char concat(unsigned char c);
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unsigned char concat(int num);
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unsigned char concat(unsigned int num);
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unsigned char concat(long num);
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unsigned char concat(unsigned long num);
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// if there's not enough memory for the concatenated value, the string
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// will be left unchanged (but this isn't signalled in any way)
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String & operator += (const String &rhs) {concat(rhs); return (*this);}
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String & operator += (const char *cstr) {concat(cstr); return (*this);}
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String & operator += (char c) {concat(c); return (*this);}
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String & operator += (unsigned char num) {concat(num); return (*this);}
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String & operator += (int num) {concat(num); return (*this);}
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String & operator += (unsigned int num) {concat(num); return (*this);}
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String & operator += (long num) {concat(num); return (*this);}
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String & operator += (unsigned long num) {concat(num); return (*this);}
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friend StringSumHelper & operator + (const StringSumHelper &lhs, const String &rhs);
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friend StringSumHelper & operator + (const StringSumHelper &lhs, const char *cstr);
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friend StringSumHelper & operator + (const StringSumHelper &lhs, char c);
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friend StringSumHelper & operator + (const StringSumHelper &lhs, unsigned char num);
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friend StringSumHelper & operator + (const StringSumHelper &lhs, int num);
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friend StringSumHelper & operator + (const StringSumHelper &lhs, unsigned int num);
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friend StringSumHelper & operator + (const StringSumHelper &lhs, long num);
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friend StringSumHelper & operator + (const StringSumHelper &lhs, unsigned long num);
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// comparison (only works w/ Strings and "strings")
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operator StringIfHelperType() const { return buffer ? &String::StringIfHelper : 0; }
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int compareTo(const String &s) const;
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unsigned char equals(const String &s) const;
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unsigned char equals(const char *cstr) const;
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unsigned char operator == (const String &rhs) const {return equals(rhs);}
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unsigned char operator == (const char *cstr) const {return equals(cstr);}
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unsigned char operator != (const String &rhs) const {return !equals(rhs);}
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unsigned char operator != (const char *cstr) const {return !equals(cstr);}
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unsigned char operator < (const String &rhs) const;
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unsigned char operator > (const String &rhs) const;
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unsigned char operator <= (const String &rhs) const;
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unsigned char operator >= (const String &rhs) const;
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unsigned char equalsIgnoreCase(const String &s) const;
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unsigned char startsWith( const String &prefix) const;
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unsigned char startsWith(const String &prefix, unsigned int offset) const;
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unsigned char endsWith(const String &suffix) const;
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// character acccess
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char charAt(unsigned int index) const;
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void setCharAt(unsigned int index, char c);
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char operator [] (unsigned int index) const;
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char& operator [] (unsigned int index);
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void getBytes(unsigned char *buf, unsigned int bufsize, unsigned int index=0) const;
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void toCharArray(char *buf, unsigned int bufsize, unsigned int index=0) const
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{getBytes((unsigned char *)buf, bufsize, index);}
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// search
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int indexOf( char ch ) const;
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int indexOf( char ch, unsigned int fromIndex ) const;
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int indexOf( const String &str ) const;
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int indexOf( const String &str, unsigned int fromIndex ) const;
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int lastIndexOf( char ch ) const;
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int lastIndexOf( char ch, unsigned int fromIndex ) const;
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int lastIndexOf( const String &str ) const;
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int lastIndexOf( const String &str, unsigned int fromIndex ) const;
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String substring( unsigned int beginIndex ) const;
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String substring( unsigned int beginIndex, unsigned int endIndex ) const;
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// modification
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void replace(char find, char replace);
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void replace(const String& find, const String& replace);
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void toLowerCase(void);
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void toUpperCase(void);
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void trim(void);
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// parsing/conversion
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long toInt(void) const;
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protected:
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char *buffer; // the actual char array
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unsigned int capacity; // the array length minus one (for the '\0')
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unsigned int len; // the String length (not counting the '\0')
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unsigned char flags; // unused, for future features
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protected:
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void init(void);
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void invalidate(void);
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unsigned char changeBuffer(unsigned int maxStrLen);
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unsigned char concat(const char *cstr, unsigned int length);
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// copy and move
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String & copy(const char *cstr, unsigned int length);
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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void move(String &rhs);
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#endif
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};
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class StringSumHelper : public String
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{
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public:
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StringSumHelper(const String &s) : String(s) {}
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StringSumHelper(const char *p) : String(p) {}
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StringSumHelper(char c) : String(c) {}
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StringSumHelper(unsigned char num) : String(num) {}
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StringSumHelper(int num) : String(num) {}
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StringSumHelper(unsigned int num) : String(num) {}
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StringSumHelper(long num) : String(num) {}
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StringSumHelper(unsigned long num) : String(num) {}
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};
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#endif // __cplusplus
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#endif // String_class_h
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