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* Added TemplatePrinter from @Chris--A (properly this time)
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/************************************************************ | ||
TemplatePrinter Class | ||
A basic templating engine for a stream of text. | ||
This wraps the Arduino Print interface and writes to any | ||
Print interface. | ||
Written by Christopher Andrews (https://github.com/Chris--A) | ||
************************************************************/ | ||
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#include "TemplatePrinter.h" | ||
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void TemplatePrinter::resetParam(bool flush){ | ||
if(flush && _inParam){ | ||
_stream.write(_delimiter); | ||
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if(_paramPos) | ||
_stream.print(_paramBuffer); | ||
} | ||
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memset(_paramBuffer, 0, sizeof(_paramBuffer)); | ||
_paramPos = 0; | ||
_inParam = false; | ||
} | ||
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void TemplatePrinter::flush(){ | ||
resetParam(true); | ||
_stream.flush(); | ||
} | ||
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size_t TemplatePrinter::write(uint8_t data){ | ||
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if(data == _delimiter){ | ||
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// End of parameter, send to callback | ||
if(_inParam){ | ||
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// On false, return the parameter place holder as is: not a parameter | ||
// Bug fix: ignore parameters that are zero length. | ||
if(!_paramPos || !_cb(_stream, _paramBuffer)){ | ||
resetParam(true); | ||
_stream.write(data); | ||
}else{ | ||
resetParam(false); | ||
} | ||
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// Start collecting parameter | ||
}else{ | ||
_inParam = true; | ||
} | ||
}else{ | ||
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// Are we collecting | ||
if(_inParam){ | ||
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// Is param still valid | ||
if(isalnum(data) || data == '_'){ | ||
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// Total param len must be 63, 1 for null. | ||
if(_paramPos < sizeof(_paramBuffer) - 1){ | ||
_paramBuffer[_paramPos++] = data; | ||
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// Not a valid param | ||
}else{ | ||
resetParam(true); | ||
} | ||
}else{ | ||
resetParam(true); | ||
_stream.write(data); | ||
} | ||
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// Just output | ||
}else{ | ||
_stream.write(data); | ||
} | ||
} | ||
return 1; | ||
} | ||
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size_t TemplatePrinter::copyFrom(Stream &stream){ | ||
size_t count = 0; | ||
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while(stream.available()) | ||
count += this->write(stream.read()); | ||
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return count; | ||
} |
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#ifndef TemplatePrinter_h | ||
#define TemplatePrinter_h | ||
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#include "PsychicCore.h" | ||
#include <Print.h> | ||
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/************************************************************ | ||
TemplatePrinter Class | ||
A basic templating engine for a stream of text. | ||
This wraps the Arduino Print interface and writes to any | ||
Print interface. | ||
Written by Christopher Andrews (https://github.com/Chris--A) | ||
************************************************************/ | ||
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class TemplatePrinter; | ||
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typedef std::function<bool(Print &output, const char *parameter)> TemplateCallback; | ||
typedef std::function<void(TemplatePrinter &printer)> TemplateSourceCallback; | ||
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class TemplatePrinter : public Print{ | ||
private: | ||
bool _inParam; | ||
char _paramBuffer[64]; | ||
uint8_t _paramPos; | ||
Print &_stream; | ||
TemplateCallback _cb; | ||
char _delimiter; | ||
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void resetParam(bool flush); | ||
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public: | ||
using Print::write; | ||
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static void start(Print &stream, TemplateCallback cb, TemplateSourceCallback entry){ | ||
TemplatePrinter printer(stream, cb); | ||
entry(printer); | ||
} | ||
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TemplatePrinter(Print &stream, TemplateCallback cb, const char delimeter = '%') : _stream(stream), _cb(cb), _delimiter(delimeter) { resetParam(false); } | ||
~TemplatePrinter(){ flush(); } | ||
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void flush() override; | ||
size_t write(uint8_t data) override; | ||
size_t copyFrom(Stream &stream); | ||
}; | ||
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#endif |