noctisroll 0.2.2

A modern, modular TRPG dice rolling system implementing the OneDice standard
Documentation 
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// Pest grammar for OneDice expressions

expression = { term ~ (op ~ term)* }
term = { factor ~ (op ~ factor)* }
factor = { dice_expr | number | paren_expr }

paren_expr = { "(" ~ expression ~ ")" }

dice_expr = { 
    dice_count? ~ dice_type ~ dice_sides? ~ dice_param*
}

dice_count = @{ ASCII_DIGIT+ }
dice_type = @{ "d" | "a" | "c" | "f" | "df" }
dice_sides = @{ ASCII_DIGIT+ }

dice_param = {
    keep_highest |
    keep_lowest |
    explode |
    success_threshold
}

keep_highest = { "k" ~ ASCII_DIGIT+ }
keep_lowest = { "q" ~ ASCII_DIGIT+ }
explode = { "!" ~ ASCII_DIGIT* }
success_threshold = { "a" ~ ASCII_DIGIT+ }

number = @{ ("+" | "-")? ~ ASCII_DIGIT+ }
op = @{ "+" | "-" | "*" | "/" | "%" | "^" | "**" }

WHITESPACE = _{ " " | "\t" | "\n" | "\r" }