KM2 can be used to generated weird stuff

1. WEIRD STUFF WITH KM2

Other presentations are also available on the web :
KM2 allows fancy (but very efficient) programming.

1.1. Some quick examples
using greek characters and usual math notation :
This is a python program

1.2. Programming with KM2

1.2.1. Programming with tables

Suppose we want to write some similar functions that are very similar.
We define a table as a variable :

SOURCE IN KM2

First define the table of functions as a tree variable :

⇨
Generated by KM2 :

The table can now appear in the text :
name stop stop_value recursion
fact n < 1 1 n * fact (n-1)
fib n < 2 1 fib (n-1) + fib (n-2)
sum_squares n < 1 0 n*n + sum_squares (n-1)

Now we can define all the functions with just a macro
SOURCE IN KM2


and the extraction macro for python

⇨
Generated by KM2 : 

def fact (n) :
    if n < 1 :
        return 1
    else :
        return n * fact (n-1)
def fib (n) :
    if n < 2 :
        return 1
    else :
        return fib (n-1) + fib (n-2)
def sum_squares (n) :
    if n < 1 :
        return 0
    else :
        return n*n + sum_squares (n-1)

And also some js code :
SOURCE IN KM2


and the extraction macro for javascript

⇨
Generated by KM2 : 

function fact (n) {
    if (n < 1) {
        return 1;
        }
    else {
        return n * fact (n-1);
    }
}
function fib (n) {
    if (n < 2) {
        return 1;
        }
    else {
        return fib (n-1) + fib (n-2);
    }
}
function sum_squares (n) {
    if (n < 1) {
        return 0;
        }
    else {
        return n*n + sum_squares (n-1);
    }
}

1.2.2. The 'WHERE' syntax

SOURCE IN KM2

A simple example

⇨
Generated by KM2 : 











1.3. Writing documents with KM2

Suppose we want to write some more documentation about the functions defined above


We redefine a table
as a variable :



Now we generate the code with the documentation











SOURCE IN KM2





First define the table of functions as a tree variable :




and the extraction macro for python












⇨










Generated by KM2 :































SOURCE IN KM2





First we improve slightly the documentation with more information, hyperlinks and graphics:




Now we can also generate 'on the fly', more documentation for the code :




The output is not in the same order as in the table or in the declaration


Also we can see that programm sources can not embed documenttaion with graphics.










⇨










Generated by KM2 :








#INFORMATIONS
#---  fact (n) ---
#tested ok
#---  fib (n) ---
#Here, fib is computed in fib (n) time
#    can be computed in log (n) time
#---  sum_squares (n) ---
#tested ok
#NOW THE CODE












But we can do better  (cf below) !





Now, we can generate text for a better documentation :









SOURCE IN KM2



















⇨










Generated by KM2 :







List of functions :





-- fact(n)


-- fib(n)


-- sum_squares(n)







---  function fact (n) ---









Documentation :



the factorial function




Notes :


        tested ok


















---  function fib (n) ---









Documentation :



the fibonacci function





Notes :


        Here, fib is computed in fib (n) time


                can be computed in log (n) time


















---  function sum_squares (n) ---









Documentation :



The sum of  integer squares up to n
there is also a polynomial formula




Notes :


        tested ok























1.4. Writing CSS with tables

Writing CSS styles is quite painful and difficult.


KM2 allows to use tables
which are easier to define, read and maintain.




STEP 1 : define the selectors and their values :





Example of css styles for headers




The values of variables can be defined as variabe in the file or by defining palettes :









Of course, we define several tables similarly for navbar, articles, etc




Now we describe the macros and generate the file :







palette using css variables at the beginning of the file




STEP 2 : write macros to generate the css


Macros for the generation of css files




Step 3 : generate the css file





We get :




and :











Done.








Remember that you write the macros once, and only change tables !
















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