aleph-syntax-tree 0.1.5

Aleph Syntax Tree structure.
Documentation 
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expr:
    | integer -> Integer($1)
    | expr "*" expr -> Mul($1, s2)
    | expr "/" expr -> Div($1, s2)
    | expr "+" expr -> Add($1, $2)
    | expr "-" expr -> Sub($1, $2)

integer:
    | r"-{0,1}[0-9]+" -> $1