You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
130 lines
6.0 KiB
130 lines
6.0 KiB
/*
|
|
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;
|
|
|
|
Stream() {_timeout=1000;}
|
|
|
|
// parsing methods
|
|
|
|
void setTimeout(unsigned long timeout); // sets maximum milliseconds to wait for stream data, default is 1 second
|
|
unsigned long getTimeout(void) { return _timeout; }
|
|
|
|
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
|