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/*
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(ignore) parseInt(ignore)
#define getFloat() parseFloat()
#define getFloat(ignore) parseFloat(ignore)
#define getString( pre_string, post_string, buffer, length)
readBytesBetween( pre_string, terminator, buffer, length)
*/
// This enumeration provides the lookahead options for parseInt(), parseFloat()
// The rules set out here are used until either the first valid character is found
// or a time out occurs due to lack of input.
enum LookaheadMode{
SKIP_ALL, // All invalid characters are ignored.
SKIP_NONE, // Nothing is skipped, and the stream is not touched unless the first waiting character is valid.
SKIP_WHITESPACE // Only tabs, spaces, line feeds & carriage returns are skipped.
};
#define NO_IGNORE_CHAR '\x01' // a char not found in a valid ASCII numeric field
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(LookaheadMode lookahead, bool detectDecimal); // 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;}
// parsing methods
void setTimeout(unsigned long timeout); // sets maximum milliseconds to wait for stream data, default is 1 second
bool find(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(char *target, size_t length); // reads data from the stream until the target string of given length is found
bool find(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(char *target, char *terminator); // as find but search ends if the terminator string is found
bool findUntil(uint8_t *target, char *terminator) { return findUntil((char *)target, terminator); }
bool findUntil(char *target, size_t targetLen, char *terminate, size_t termLen); // as above but search ends if the terminate string is found
bool findUntil(uint8_t *target, size_t targetLen, char *terminate, size_t termLen) {return findUntil((char *)target, targetLen, terminate, termLen); }
long parseInt(LookaheadMode lookahead = SKIP_ALL, char ignore = NO_IGNORE_CHAR);
// returns the first valid (long) integer value from the current position.
// lookahead determines how parseInt looks ahead in the stream.
// See LookaheadMode enumeration at the top of the file.
// Lookahead is terminated by the first character that is not a valid part of an integer.
// Once parsing commences, 'ignore' will be skipped in the stream.
float parseFloat(LookaheadMode lookahead = SKIP_ALL, char ignore = NO_IGNORE_CHAR);
// float version of parseInt
size_t readBytes( char *buffer, size_t length); // read chars from stream into buffer
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
String readString();
String readStringUntil(char terminator);
protected:
long parseInt(char ignore) { return parseInt(SKIP_ALL, ignore); }
float parseFloat(char ignore) { return parseFloat(SKIP_ALL, ignore); }
// These overload exists for compatibility with any class that has derived
// Stream and used parseFloat/Int with a custom ignore character. To keep
// the public API simple, these overload remains protected.
struct MultiTarget {
const char *str; // string you're searching for
size_t len; // length of string you're searching for
size_t index; // index used by the search routine.
};
// This allows you to search for an arbitrary number of strings.
// Returns index of the target that is found first or -1 if timeout occurs.
int findMulti(struct MultiTarget *targets, int tCount);
};
#undef NO_IGNORE_CHAR
#endif
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