metaComp

A D library to compile scripts into D at compile time

It handles lexing, parsing and compilation. Has its own associated syntax free grammar based on EBNF.

Example

grammar.txt

root = [var | assign | action]*(';')
var = ["var" id:name ['=' int:value]?:initial ]
assign = [id:name '=' int:value]
action = [id:what [id | int]*(','):args ]

script.txt

var i;
var j;

i = 250;
j = 25;

print i, j, 30;

usage in D

struct Script
{
    mixin fileToGrammar!("grammar.txt"); //create a struct root, var, assign and action
    
    string parser(root value)() { ... } //user implementation
    string parser(var value)() { ... } //user implementation
    string parser(assign value)() { ... } //user implementation
    string parser(action value)() { ... } //user implementation
}

void main()
{
     mixin CompileFile!("scipt.txt", Script.root, Script);
}

Example of output at compile time:

250 25 30