raster_font 0.1.1

A format for authoring and using image-backed fonts
Documentation 
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UNION = _{ "|" }
START = _{ "$(" }
CLOSE = _{ ")" }
ESC = _{ "\\" }

RESERVED = { UNION | START | CLOSE }

any_char = !{ ANY }
sub_char = { (ESC ~ any_char) | (!(RESERVED | ESC) ~ any_char) }
char = _{ (ESC ~ any_char) | (!START ~ any_char)  }

sub = @{ sub_char+ }
term = _{ sub }

multi_union = { UNION* ~ term ~ (UNION* ~ term)* ~ UNION* }
empty_union = _{ UNION* }

_multi_content = _{ multi_union | empty_union }
_control_token = _{ START ~ _multi_content ~ CLOSE }

// * INPUT = abc$(xyz|\$(\)|d)foo
// ? -> [a, ERROR(expect EOI)]
single_token = _{ token ~ EOI }
// ? -> [a,b,c, [xyz,$(),d], f,o,o]
tokens = _{ token+ ~ EOI }
token = _{
	| _control_token
    | char
}