ruby_parse.d

import pegged.grammar;
import std.stdio;
import std.conv;

mixin(grammar(`
	RubySource <- S Expr* End
	Until(Expr) <~ (!Expr > .)* Expr

	S <- Comment / :(Space / '\t' / EOL)
	Comment <- '#' > (!EOL > .)* > (EOL / EOI)

	Expr <- FloatLiteral / IntegerLiteral

	# OctLiteral comes before DecLiteral
	IntegerLiteral <~ HexLiteral / BinLiteral / OctLiteral / DecLiteral
	FloatLiteral <~ DecLiteral > '.' > DecLiteral > ([eE] > [+-]? > [0-9]+)?
	#FloatLiteral <~ DecLiteral > '.' > DecLiteral > ([eE] > [+-]? > DecLiteral)?
	DecLiteral <- [0-9] > ('_'? > [0-9])*
	HexLiteral <- '0' > [xX] > [0-9a-fA-F] > ('_'? > [0-9a-fA-F])*
	BinLiteral <- '0' > [bB] > [0-1] > ('_'? > [0-1])*
	OctLiteral <- '0' DecLiteral

	AddOp <- '+'
	SubOp <- '-'
	MulOp <- '*'
	DivOp <- '/'
	AndOp1 <- '&&'
	AndOp2 <- 'and'
	OrOp1 <- '||'
	OrOp2 <- 'or'
	NotOp1 <- '!'
	NotOp2 <- 'not'
`));

/*
5.0
3e2
3E2
3e-2
3e+2
3E-2
5.3e2
0x12_3Fa
0XAfc

*/

void main() {
	auto str = `
0XAfc
	`;
	auto tree = RubySource.parse(str);

	writefln("Tree: %s", tree);
}