/*
Stream.h - base class for character-based streams.
Copyright (c) 2010 David A. Mellis. All right reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
parsing functions based on TextFinder library by Michael Margolis
Modified August 2016 by Marcelo Aquino <marceloaqno@gmail.org> for MySensors use
*/
#ifndef Stream_h
#define Stream_h
#include <inttypes.h>
#include <string>
#include "Print.h"
// compatability macros for testing
/*
#define getInt() parseInt()
#define getInt(skipChar) parseInt(skipchar)
#define getFloat() parseFloat()
#define getFloat(skipChar) parseFloat(skipChar)
#define getString( pre_string, post_string, buffer, length)
readBytesBetween( pre_string, terminator, buffer, length)
*/
#if !DOXYGEN
class Stream: public Print
{
protected:
unsigned long
_timeout; // number of milliseconds to wait for the next char before aborting timed read
unsigned long _startMillis; // used for timeout measurement
int timedRead(); // private method to read stream with timeout
int timedPeek(); // private method to peek stream with timeout
int peekNextDigit(); // returns the next numeric digit in the stream or -1 if timeout
public:
virtual int available() = 0;
virtual int read() = 0;
virtual int peek() = 0;
virtual void flush() = 0;
Stream()
{
_timeout = 1000;
_startMillis = 0;
}
// parsing methods
void setTimeout(unsigned long
timeout); // sets maximum milliseconds to wait for stream data, default is 1 second
bool find(const char *target); // reads data from the stream until the target string is found
bool find(uint8_t *target)
{
return find((char *) target);
}
// returns true if target string is found, false if timed out (see setTimeout)
bool find(const char *target, size_t
length); // reads data from the stream until the target string of given length is found
bool find(const uint8_t *target, size_t length)
{
return find((char *) target, length);
}
// returns true if target string is found, false if timed out
bool find(char target)
{
return find (&target, 1);
}
bool findUntil(const char *target,
const char *terminator); // as find but search ends if the terminator string is found
bool findUntil(const uint8_t *target, const char *terminator)
{
return findUntil((char *) target, terminator);
}
bool findUntil(const char *target, size_t targetLen, const char *terminate,
size_t termLen); // as above but search ends if the terminate string is found
bool findUntil(const uint8_t *target, size_t targetLen, const char *terminate, size_t termLen)
{
return findUntil((char *) target, targetLen, terminate, termLen);
}
long parseInt(); // returns the first valid (long) integer value from the current position.
// initial characters that are not digits (or the minus sign) are skipped
// integer is terminated by the first character that is not a digit.
float parseFloat(); // float version of parseInt
virtual size_t readBytes(char *buffer, size_t length); // read chars from stream into buffer
virtual size_t readBytes(uint8_t *buffer, size_t length)
{
return readBytes((char *) buffer, length);
}
// terminates if length characters have been read or timeout (see setTimeout)
// returns the number of characters placed in the buffer (0 means no valid data found)
size_t readBytesUntil(char terminator, char *buffer,
size_t length); // as readBytes with terminator character
size_t readBytesUntil(char terminator, uint8_t *buffer, size_t length)
{
return readBytesUntil(terminator, (char *) buffer, length);
}
// terminates if length characters have been read, timeout, or if the terminator character detected
// returns the number of characters placed in the buffer (0 means no valid data found)
// Arduino String functions to be added here
std::string readString();
std::string readStringUntil(char terminator);
protected:
long parseInt(char skipChar); // as above but the given skipChar is ignored
// as above but the given skipChar is ignored
// this allows format characters (typically commas) in values to be ignored
float parseFloat(char skipChar); // as above but the given skipChar is ignored
};
#endif
#endif