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Ranges (pegjs/pegjs#30): Implement ranges support. Range syntax:
``` expression| exact | expression| .. | expression|min.. | expression| ..max| expression|min..max| ``` Introduce two new opcodes: * IF_LT <min>, <then part length>, <else part length> * IF_GE <max>, <then part length>, <else part length> Introduce a new AST node -- `repeated`, that contains expression and the minimum and maximum number of it repetition. If `node.min.value` is `null` or isn't positive -- check of the minimum length isn't made. If `node.max.value` is `null`, check of the maximum length isn't made. If `node.min` is `null` then it is equals to the `node.max` (exact repetitions case)
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