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118 lines
5.1 KiB
C++
118 lines
5.1 KiB
C++
/*
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Stream.h - base class for character-based streams.
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Copyright (c) 2010 David A. Mellis. All right reserved.
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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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parsing functions based on TextFinder library by Michael Margolis
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*/
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#ifndef Stream_h
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#define Stream_h
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#include <stdint.h>
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#include <inttypes.h>
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#include "Print.h"
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#include "WString.h"
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// compatability macros for testing
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/*
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#define getInt() parseInt()
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#define getInt(skipChar) parseInt(skipchar)
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#define getFloat() parseFloat()
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#define getFloat(skipChar) parseFloat(skipChar)
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#define getString( pre_string, post_string, buffer, length)
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readBytesBetween( pre_string, terminator, buffer, length)
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*/
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class Stream : public Print
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{
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protected:
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unsigned long _timeout; // number of milliseconds to wait for the next char before aborting timed read
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unsigned long _startMillis; // used for timeout measurement
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int timedRead(); // private method to read stream with timeout
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int timedPeek(); // private method to peek stream with timeout
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int peekNextDigit(); // returns the next numeric digit in the stream or -1 if timeout
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public:
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virtual size_t available() = 0;
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virtual int16_t read() = 0; // signed int required for error (empty buffer) value
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virtual int16_t peek() = 0;
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virtual void flush() = 0;
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Stream() {_timeout=1000;}
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// parsing methods
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void setTimeout(unsigned long timeout); // sets maximum milliseconds to wait for stream data, default is 1 second
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bool find(char *target); // reads data from the stream until the target string is found
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bool find(uint8_t *target) { return find ((char *)target); }
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// returns true if target string is found, false if timed out (see setTimeout)
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bool find(char *target, size_t length); // reads data from the stream until the target string of given length is found
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bool find(uint8_t *target, size_t length) { return find ((char *)target, length); }
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// returns true if target string is found, false if timed out
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bool find(char target) { return find (&target, 1); }
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bool findUntil(char *target, char *terminator); // as find but search ends if the terminator string is found
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bool findUntil(uint8_t *target, char *terminator) { return findUntil((char *)target, terminator); }
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bool findUntil(char *target, size_t targetLen, char *terminate, size_t termLen); // as above but search ends if the terminate string is found
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bool findUntil(uint8_t *target, size_t targetLen, char *terminate, size_t termLen) {return findUntil((char *)target, targetLen, terminate, termLen); }
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long parseInt(); // returns the first valid (long) integer value from the current position.
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// initial characters that are not digits (or the minus sign) are skipped
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// integer is terminated by the first character that is not a digit.
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float parseFloat(); // float version of parseInt
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size_t readBytes( char *buffer, size_t length); // read chars from stream into buffer
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size_t readBytes( uint8_t *buffer, size_t length) { return readBytes((char *)buffer, length); }
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// terminates if length characters have been read or timeout (see setTimeout)
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// returns the number of characters placed in the buffer (0 means no valid data found)
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size_t readBytesUntil( char terminator, char *buffer, size_t length); // as readBytes with terminator character
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size_t readBytesUntil( char terminator, uint8_t *buffer, size_t length) { return readBytesUntil(terminator, (char *)buffer, length); }
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// terminates if length characters have been read, timeout, or if the terminator character detected
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// returns the number of characters placed in the buffer (0 means no valid data found)
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// Arduino String functions to be added here
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String readString();
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String readStringUntil(char terminator);
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protected:
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long parseInt(char skipChar); // as above but the given skipChar is ignored
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// as above but the given skipChar is ignored
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// this allows format characters (typically commas) in values to be ignored
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float parseFloat(char skipChar); // as above but the given skipChar is ignored
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struct MultiTarget {
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const char *str; // string you're searching for
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size_t len; // length of string you're searching for
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size_t index; // index used by the search routine.
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};
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// This allows you to search for an arbitrary number of strings.
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// Returns index of the target that is found first or -1 if timeout occurs.
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int findMulti(struct MultiTarget *targets, int tCount);
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};
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#endif
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