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Add a dice-rolling DSL with sigil support and reusable compiled functions to your application.
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src/dice_parser.yrl
Nonterminals
expr
unary_operator
.
Terminals
digit
basic_operator
complex_operator
roll
'('
')'
.
Rootsymbol expr.
Left 500 roll.
Left 400 unary_operator.
Left 300 complex_operator.
Left 200 basic_operator.
expr -> expr roll expr : {roll, '$1', '$3'}.
expr -> expr complex_operator expr : {op('$2'), '$1', '$3'}.
expr -> expr basic_operator expr : {op('$2'), '$1', '$3'}.
expr -> '(' expr ')' : '$2'.
expr -> digit : val('$1').
expr -> unary_operator : '$1'.
unary_operator -> basic_operator digit : {digit, last('$1') ++ last('$2')}.
Erlang code.
val({T,_,V}) -> {T, V}.
op({_, _, V}) -> {operator, V}.
last({_, _, V}) -> V.