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static LS tok_moveImportsUp(L tok) {
new StringBuilder buf;
//print("tok_moveImportsUp n=" + l(tok));
//print("Source begins: " + quote(shorten(join(tok), 200)));
// scan imports on top
int i;
new Set have;
for (i = 1; i < l(tok); i += 2)
if (eq(tok.get(i), 'import)) {
int j = indexOf(tok, i+2, ";");
if (j < 0) break;
S s = joinSubList(tok, i, j+1);
have.add(s);
i = j;
} else break;
//print("tok_moveImportsUp have " + l(have) + " after " + i);
new L reToks;
// scan imports in text
for (int i2 : indicesOf(tok, "import"))
if (i2 >= i) {
int j = indexOf(tok, i2+2, ";");
if (j < 0) continue; // huh?
S s = joinSubList(tok, i2, j+1);
//print("Found import at " + i2 + ": " + s);
if (!have.contains(s)) {
buf.append(s).append("\n");
have.add(s);
}
replaceTokens(tok, i, j+1, "");
ifndef tok_moveImportsUp_skipMostReToks
reToks.add(intRange(i, j+1));
endifndef
i -= 2;
}
if (nempty(buf)) {
if (l(tok) == 1) addAll(tok, "", "");
tok.set(1, str(buf)+"\n"+tok.get(1));
reToks.add(intRange(1, 2));
}
ret reTok_multi(tok, reToks);
}