CREPL

Calculator REPL

A command line calculator read-eval-print-loop, with intuitive mathematical notation as syntax.

Install

You'll need git (if cloning), a C compiler (e.g. gcc), the GNU readline library, and make (build-essential / base-devel).

Clone

Clone / Download this repositroy however you like, e.g.

git clone "https://github.com/Demonstrandum/crepl.git"

Then change directory into it:

cd crepl

Build & Install

make  # Builds and compiles the project.
sudo make install  # Installs the program system wide.

You may also compile with debug-printing by DEFINES=-DDEBUG make instead.

Example

An example of a session:

::> k = 9
#=> 9
::> f x = 2x - k
::> f 10
#=> 11
::> addTo x = y -> x + y
::> add3 = addTo 3
::> add3 10
#=> 13
::> sum = x -> y -> x + y
::> (sum 2) 3
#=> 5
::> sin 2pi - 1
#=> -1
::> (k-2)!
#=> 5040

TODO

• Temporary variables with let ... in ... and ... where ... expressions.
• Computed physical units with through postfix operators.
  • User defined units.
• A ref(.) function, for referencing/aliasing other variables.
• Throw errors on overflows until we implement bignums.
• Imaginary numbers (using complex.h).
• User defined functions.
  • Single argument.
  • Tuple argument.
  • Anonymous functions.
• Pool constant and literal values in a preallocated structure, to save on reallocating constants by preventing them from being garbage collected.
• Garbage collection.
  • Reference count function scopes.
  • Reference count data values.
• Numerical equation solver (polynomial, simultaneous, &c.).
• Add more functionality, notably for calculus.
• Symbol manipulation (?).
• Extend numbers to include “Big Numbers” (“Big Integers” and “Big Decimals”/Rationals), numbers a currently limited to ~80bit floats and pointer-sized (likely 64bit) integeres.