Within the same block, .. conditionX associates with the nearest condition1 .. condition2 lexically above it. So in:

if (cond1 .. cond2) { if ( .. condA) { } }
if (      .. cond3) { }
if (cond4 .. cond5) { if (condB .. condC) }
if (      .. cond6) { }
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.. cond3 would associate with cond1 .. cond2

.. condA would not, because its in a different block (it would be an orphan)

.. cond6 would associate with cond4 .. cond5 (it would not "see" condB .. condC because that is in a different block)

In terms of parsing, the handler for .. conditionX would search backwards until it found a conditionV .. conditionW or the beginning of the block. Then the conditionV .. conditionW would be "informed" of the .. conditionX

(Updated to add paragraph about parsing)