Liquid: For Devs

#Liquid For Devs!

We don't need to add functionality in src/, that is the participants' job (See the wiki "Liquid: How To" page). The main file is liquid.cpp.

This is the directory structure:

└── liquid
    ├── liquid.cpp
    ├── testing.cpp
    ├── shunting-yard.cpp
    ├── shunting-yard.h
    ├── Makefile
    └── src
        ├── math-lib.h
        ├── ml_add.cpp
        ├── ml_div.cpp
        ├── ml_mul.cpp
        ├── ml_sub.cpp
        ├── .
        ├── .
        ├── .
        └── ml_*****.cpp

##How to build and run

On your terminal,

$ cd <path to "liquid">
$ make liquid
$ make test <or> ./liquid

In case you get errors in building, try

$ make again

make liquidcompiles all the src/ml_ * .cpp files and links them to th liquid.o to make the executeable liquid.

##What needs to be done? Currently, liquid.cpp is has a non-intuitive way of interaction. Since we are making a math expression solver, we should be able to input infix expressions. @bamos built a nice implementation of the Shunting-Yard Algorithm here We need to change our liquid.cpp to utilise the power of shunting-yard.cpp.

• Get user expression from stdin.
• Compile the expression (using calculator::compile())
• Evaluate the expression
  • by over-riding / modifying the calculator::calculate(TokenQueue_t) method.
  • the functions implemented by src/ml_ * .cpp would be invoked.
• Show output, wait for more expressions.

That's not all! Checkout the issues for details on adding function calls, exotic operators.

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Comment on the issue to let everyone know you are working on this. Why should 14 people develop just 1 feature which can be developed by a far less number of people and there are numerous other things to work on.

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To work on this, you must understand the "Shuning Yard Algorithm" pretty well. The wikipedia page has a lot of references.