kopia lustrzana https://github.com/weetmuts/wmbusmeters
266 wiersze
10 KiB
C++
266 wiersze
10 KiB
C++
/*
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Copyright (C) 2019-2022 Fredrik Öhrström (gpl-3.0-or-later)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef UNITS_H
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#define UNITS_H
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#include<string>
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#include<vector>
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// A named quantity has a preferred unit,
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// ie Volume has m3 (cubic meters) Energy has kwh, Power has kw.
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// We search for quantities in the mbus telegrams instead of
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// hard coding a specific unit. This is useful since some
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// meters can send either mj or kwh depending on their configuration.
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#define LIST_OF_QUANTITIES \
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X(Time,Hour) \
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X(Length,M) \
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X(Mass,KG) \
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X(Amperage,Ampere) \
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X(Temperature,C) \
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X(AmountOfSubstance,MOL) \
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X(LuminousIntensity,CD) \
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\
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X(Energy,KWH) \
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X(Reactive_Energy,KVARH) \
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X(Apparent_Energy,KVAH) \
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X(Power,KW) \
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\
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X(Volume,M3) \
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X(Flow,M3H) \
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\
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X(Voltage,Volt) \
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X(Frequency,HZ) \
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X(Pressure,BAR) \
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\
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X(PointInTime,DateTimeLT) \
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\
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X(RelativeHumidity,RH) \
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X(HCA,HCA) \
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X(Text,TXT) \
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X(Counter,COUNTER) \
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enum class Quantity
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{
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#define X(quantity,default_unit) quantity,
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LIST_OF_QUANTITIES
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#undef X
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Unknown
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};
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// A named unit (Unit) is a recurring unit that is useful to represent values
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// sent in mbus telegrams. A named unit can be translated into an SIUnit
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// which is unnamed and can encode any combination of SI units & scale.
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// The SIUnits are used inside formulas. Eventually a successful formula
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// calculation will map the final SI Unit to a named unit.
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#define LIST_OF_UNITS \
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X(Second,s,"s",Time,"second") \
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X(M,m,"m",Length,"meter") \
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X(KG,kg,"kg",Mass,"kilogram") \
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X(Ampere,a,"A",Amperage,"ampere") \
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X(K,k,"K",Temperature,"kelvin") \
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X(MOL,mol,"mol",AmountOfSubstance,"mole") \
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X(CD,cd,"cd",LuminousIntensity,"candela") \
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\
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X(KWH,kwh,"kWh",Energy,"kilo Watt hour") \
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X(MJ,mj,"MJ",Energy,"Mega Joule") \
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X(GJ,gj,"GJ",Energy,"Giga Joule") \
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X(KVARH,kvarh,"kVARh",Reactive_Energy,"kilo volt amperes reactive hour") \
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X(KVAH,kvah,"kVAh",Apparent_Energy,"kilo volt amperes hour") \
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X(M3C,m3c,"m³°C",Energy,"cubic meter celsius") \
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\
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X(KW,kw,"kW",Power,"kilo Watt") \
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\
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X(M3,m3,"m³",Volume,"cubic meter") \
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X(L,l,"l",Volume,"litre") \
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X(M3H,m3h,"m³/h",Flow,"cubic meters per hour") \
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X(LH,lh,"l/h",Flow,"liters per hour") \
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\
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X(C,c,"°C",Temperature,"celsius") \
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X(F,f,"°F",Temperature,"fahrenheit") \
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\
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X(Volt,v,"V",Voltage,"volt") \
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X(HZ,hz,"Hz",Frequency,"hz") \
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X(PA,pa,"pa",Pressure,"pascal") \
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X(BAR,bar,"bar",Pressure,"bar") \
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\
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X(Minute,min,"min",Time,"minute") \
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X(Hour,h,"h",Time,"hour") \
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X(Day,d,"d",Time,"day") \
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X(Month,month,"month",Time,"month") \
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X(Year,y,"y",Time,"year") \
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X(DateTimeUT,ut,"ut",PointInTime,"unix timestamp") \
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X(DateTimeUTC,utc,"utc",PointInTime,"coordinated universal time") \
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X(DateTimeLT,lt,"lt",PointInTime,"local time") \
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\
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X(RH,rh,"RH",RelativeHumidity,"relative humidity") \
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X(HCA,hca,"hca",HCA,"heat cost allocation") \
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X(TXT,txt,"txt",Text,"text") \
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X(COUNTER,counter,"counter",Counter,"counter") \
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enum class Unit
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{
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#define X(cname,lcname,hrname,quantity,explanation) cname,
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LIST_OF_UNITS
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#undef X
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Unknown
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};
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// The SIUnit is used inside formulas and for conversion between units.
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// Any numeric named Unit can be expressed using an SIUnit.
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// Most SIUnits do not have a corresponding named Unit.
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// However the result of a formula calculation or conversion will
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// be eventually converted into a named unit. So even if you
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// are allowed to write a formula: 9 kwh * 6 kwh which generates
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// the unit kwh² which is not explicitly named above,
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// you cannot assign this value to any calculated field since kwh^2
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// is not named. However you can do: sqrt(10 kwh * 10 kwh) which
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// will generated an SIUnit which is equivalent to kwh.
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//
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// Other valid formulas are for example:
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// energy_kwh = 100 kw * 22 h
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// flow_m3h = 100 m3 / 5 h
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//
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// We can only track units raised to the power of 127 or -128.
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// The struct SIExp below is used to track the exponents of the units.
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//
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struct SIExp
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{
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SIExp &s(int8_t i) { s_ = i; return *this; }
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SIExp &m(int8_t i) { m_ = i; return *this; }
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SIExp &kg(int8_t i) { kg_ = i; return *this; }
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SIExp &a(int8_t i) { a_ = i; return *this; }
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SIExp &mol(int8_t i) { mol_ = i; return *this; }
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SIExp &cd(int8_t i) { cd_ = i; return *this; }
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SIExp &k(int8_t i) { k_ = i; if (k_ != 0 && (c_ != 0 || f_ != 0)) { invalid_ = true; } return *this; }
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SIExp &c(int8_t i) { c_ = i; if (c_ != 0 && (k_ != 0 || f_ != 0)) { invalid_ = true; } return *this; }
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SIExp &f(int8_t i) { f_ = i; if (f_ != 0 && (k_ != 0 || c_ != 0)) { invalid_ = true; } return *this; }
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int8_t s() const { return s_; }
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int8_t m() const { return m_; }
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int8_t kg() const { return kg_; }
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int8_t a() const { return a_; }
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int8_t mol() const { return mol_; }
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int8_t cd() const { return cd_; }
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int8_t k() const { return k_; }
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int8_t c() const { return c_; }
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int8_t f() const { return f_; }
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SIExp mul(const SIExp &e) const;
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SIExp div(const SIExp &e) const;
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SIExp sqrt() const;
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int8_t safe_add(int8_t a, int8_t b);
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int8_t safe_sub(int8_t a, int8_t b);
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int8_t safe_div2(int8_t a);
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bool operator==(const SIExp &e) const;
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std::string str() const;
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static SIExp build() { return SIExp(); }
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private:
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int8_t s_ {};
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int8_t m_ {};
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int8_t kg_ {};
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int8_t a_ {};
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int8_t mol_ {};
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int8_t cd_ {};
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int8_t k_ {};
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int8_t c_ {}; // Why c and f here? Because they are offset against K.
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int8_t f_ {}; // Since SIUnits are also used for conversions of values, not just unit tracking,
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// this means that the offset units (c,f) must be treated as distinct units.
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// E.g. if you calculated m3*k (and forget the m3 and k value) then you
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// cannot convert this value into m3*c since the offset makes the calculation
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// depend on the k value, which we no longer know.
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// But kw*h can be translated into kw*s since scaling (*3600) can be done on the
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// calculated value without knowing the h value. Therefore we have to
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// treat k, c and f as distinct units. I.e. you cannot add m3*k+m3*f+m3*c.
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// If exponents have over/underflowed or if multiple of k,c,f are set, then the SIExp is not valid any more!
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bool invalid_ = false;
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};
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struct SIUnit
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{
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// Transform a double,double,uint64_t into an SIUnit.
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// The exp can be created compile time like this: SIUNIT(3.6E6, 0, SI_KG(1)|SI_M(2)|SI_S(-2)) which is kwh.
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SIUnit(Quantity q, double scale, SIExp exponents) :
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quantity_(q), scale_(scale), exponents_(exponents) {}
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// Transform a named unit into an SIUnit.
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SIUnit(Unit);
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// Parse string like: 3.6E106*kg*m^2*s^-3*a^−1 (ie volt)
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SIUnit(std::string s);
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// Return the known unit that best matches the SIUnit, or Unit::Unknown if none.
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Unit asUnit() const ;
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// Return the known unit that best matches the SIUnit and the quantity, or Unit::Unknown if none.
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Unit asUnit(Quantity q) const;
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// Return the quantity that this unit is used for.
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Quantity quantity() const { return quantity_; }
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// Get the scale.
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double scale() const { return scale_; }
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// Get the exponents.
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const SIExp &exp() const { return exponents_; }
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// Return a string like 3.6⁶s⁻²m²kg
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std::string str() const;
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// Return a detailed string like: kwh[3.6⁶s⁻²m²kg]Energy
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std::string info() const;
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// Check if the exponents (ie units) are the same.
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bool sameExponents(SIUnit &to) const { return exponents_ == to.exponents_; }
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// Check if this unit can be converted to the other unit.
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bool canConvertTo(const SIUnit &to) const;
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// Convert value from this unit to another unit.
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double convertTo(double val, const SIUnit &to) const;
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// Multiply this unit with another unit.
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SIUnit mul(const SIUnit &m) const ;
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// Dividethis unit with another unit.
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SIUnit div(const SIUnit &m) const ;
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// Square root this unit.
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SIUnit sqrt() const ;
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private:
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Quantity quantity_;
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double scale_;
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SIExp exponents_;
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};
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bool canConvert(Unit from, Unit to);
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double convert(double v, Unit from, Unit to);
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Unit whenMultiplied(Unit left, Unit right);
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double multiply(double l, Unit left, double r, Unit right);
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// Either uppercase KWH or lowercase kwh works here.
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Unit toUnit(std::string s);
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const SIUnit &toSIUnit(Unit u);
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const char *toString(Quantity q);
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bool isQuantity(Unit u, Quantity q);
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Quantity toQuantity(Unit u);
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void assertQuantity(Unit u, Quantity q);
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Unit defaultUnitForQuantity(Quantity q);
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std::string unitToStringHR(Unit u);
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std::string unitToStringLowerCase(Unit u);
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std::string unitToStringUpperCase(Unit u);
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std::string valueToString(double v, Unit u);
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Unit replaceWithConversionUnit(Unit u, std::vector<Unit> cs);
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bool extractUnit(const std::string &s, std::string *vname, Unit *u);
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#endif
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