Using gpp preprocessor to create more easily svg code

Hello, i'am a french programmer since years, and i use often macro processors to give some facility to coding. 
 SVG is not a functional langage, as JavaScript.
 I think SVG is very powerful, and can be used alone, in some cases, without JS or external libraries.
 So, i found GPP, a simple but powerful macro preprocessor, and write a 60 lines macros definitions to write easy SVG in texte files. GPP support #include and #define statements, so many usual svg definitions can be written in macros.
 I give you some samples below :
 

 The two following lines tell to use the macro user file (svg.inc), and create the xml and svg header, with x,y,width, height, and default viewport
 

 #include "svg.inc"
 SVG__("svg31",0,0,400,400)
 

 Below is the SVG generated code (with GPP) :
 

 <?xml version="1.0" encoding="utf-8"?><!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/D TD/svg11.dtd">
 <svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" id="svg31" x="0" y="0" width="400" height="400" viewbox="0 0 400 400" xml:space="preserve">
 

 The following lines create a <def> zone with some css statements :
 

 DEF__
 <!-- Css Defs -->
 CSS__
 _STY(_st1,_FSS(blue,1,red,2))
 _STY(_st2,_FSS(red,0.5,green,4))
 _STY(_st3,_FSS(none,1,black,1))
 _STY(_st4,_FSS(green,1,yellow,1) _TSS("Comic sans Ms",1cm))
 __CSS
 __DEF
 

 The _FSS macro define fill and stroke parameters
 The _TSS macro define font-family and font-size parameters
 

 The following lines define some graphic elements :
 

 _RCT("rec1",10,10,70,50,_st1,)
 _CIR("cir1",120,120,30,_st2,)
 _PTH("tri1","M120 20 L200 20 L150 50 L120 20",_st3,)
 _TXT("txt1",10,100,_st4,Egc,)
 

 _RCT is a <rect>, _CIR a circle, _PTH a path, _TXT a text
 Each element have a style, and can integrate some animate tags as last argument.
 

 I write the code as : source.txt
 I use the console command : gpp source.txt -o result.svg
 And i load result.svg in internet browser to see the svg file
 Errors are very easy to see and correct.
 



 I write some others macros to simplify gradients, filters, and animation tags.
 

 Please, feedback if interested about this subject.
 Thank you very much
 

 Greetings to all svg'rs !
 

 Yves