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Refactor str-insert()

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This makes the logic simpler and clearer.
This commit is contained in:
Natalie Weizenbaum 2018-01-14 14:41:08 -08:00
parent b1b9eca66a
commit c88912fc4c
1 changed files with 5 additions and 11 deletions
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16
lib/src/functions.dart
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@ -565,20 +565,14 @@ final List<BuiltInCallable> coreFunctions = new UnmodifiableListView([
index.assertNoUnits("index");
var indexInt = index.assertInt("index");
var codepointIndex = _codepointForIndex(indexInt, string.text.runes.length,
allowNegative: true);
// str-insert has unusual behavior for negative inputs. It guarantees that
// the $insert is at $index in the result, which means that we want to
// insert before that point if $index is positive and after if it's
// the `$insert` string is at `$index` in the result, which means that we
// want to insert before `$index` if it's positive and after if it's
// negative.
if (indexInt < 0) {
if (codepointIndex < 0) {
codepointIndex = 0;
} else {
codepointIndex++;
}
}
if (indexInt < 0) indexInt++;
var codepointIndex = _codepointForIndex(indexInt, string.text.runes.length);
var codeUnitIndex =
codepointIndexToCodeUnitIndex(string.text, codepointIndex);