D-SI Parser

This library converts D-SI unit strings to Latex. And is able to perform math operations *, / and power with the D-SI units as well as checken weather teh can be converted into each other with scalar multiplication

Javascript version

The folder dsiUnits-js contains an Javascript version of this libary that can be used for a D-SI-Unit-Input Element with autosugestion. And a dsiUnit CLass that supports parsing and rendering (HTML converion) of the dsi Units.

Installation

pip install dsiUnits

Usage

The Constructor dsiUnit(str) will parse the string and create a dsiUnit object. BIMP-SI-RP strings are also supported and will be converted to D-SI units. The dsiUnit object has the following methods:

• toLatex(): returns the Latex representation of the unit
• toUTF8(): returns the UTF8 representation of the unit
• isScalablyEqualTo(other): checks whether the unit is equal to another unit with scalar multiplication
• toSIRP(pid=False): returns the SIRP representation of the unit. If pid is true the PID as URL is returned.

And following magic functions:

• __mul__(other): "*" multiplies the unit with another unit or a scalar

• __truediv__(other): "/" divides the unit by another unit or a scalar

• __pow__(other): "**" raises the unit to the power of another unit or a scalar

• __eq__(other): "==" checks whether the unit is equal to another unit

• __str__: "str()" returns the string representation of the unit

• __repr__: returns the string representation of the unit

• toBaseUnitTree(): returns the base unit tree of the unit

• reduceFraction(): reduces the fraction of the unit by resolving all \per and combining same units by exponent addition

• sortTree(): sorts the base unit tree of the unit

from dsiUnits import dsiUnit

unit = dsiUnit('\metre\second\tothe{-1}')
latexStr=unit.toLatex()
print(latexStr)

from dsiUnits import dsiUnit

mps = dsiUnit(r'\metre\second\tothe{-1}')
kmh = dsiUnit(r'\kilo\metre\per\hour')
scaleFactor, baseUnit = mps.isScalablyEqualTo(kmh)
print("The unit "+str(mps)+" is equal to "+str(kmh)+" with a factor of "+scaleFactor+" and base unit "+str(baseUnit))

For more usage examples see the Example Notebook, as well as the pytest file.