arduino-esp32/cores/esp32/Stream.h

/*
 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
 */

#ifndef Stream_h
#define Stream_h

#include <inttypes.h>
#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)
 */

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():_startMillis(0)
    {
        _timeout = 1000;
    }
    virtual ~Stream() {}

// parsing methods

    void setTimeout(unsigned long timeout);  // sets maximum milliseconds to wait for stream data, default is 1 second
    unsigned long getTimeout(void);
    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
    virtual String readString();
    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