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// transformer can return null or input on no change
sS lambdaMapLike gazelle_deepTransform(IF1 transformer, S input, O... _) {
if (transformer == null) ret input;
// call transformer on whole input
input = or(transformer.get(input), input);
// tokenize (possibly transformed) input
O tokenizer = optPar tokenizer(_, f javaTokWithBrackets);
LS tok = callTokenizer(tokenizer, input);
bool changes;
for (int i = 1; i < l(tok); i += 2) {
S t = tok.get(i);
if (tok_isRoundOrCurlyBracketed(t)) {
S unBracketed = tok_deRoundOrCurlyBracket(t);
S transformed = gazelle_deepTransform(transformer, unBracketed, _);
if (transformed != unBracketed) {
if (!changes) tok = cloneList(tok); // in case a caching tokenizer was used
// enclose in brackets & replace
tok.set(i, startsWith(t, "(") ? roundOpt(transformed) : curlyOpt(transformed));
set changes;
}
}
}
ret changes ? join(tok) : input;
}