E.2 Methods
Methods
Extensions to a language's native String class or interface
Returns the UTF-16 offset that corresponds to a UTF-32 offset.
Used for random access.
NOTE:
You can always round-trip from a UTF-32 offset to a UTF-16
offset and back. You can round-trip from a UTF-16 offset to
a UTF-32 offset and back if and only if the offset16 is not
in the middle of a surrogate pair. Unmatched surrogates
count as a single UTF-16 value.
UTF-32 offset.
UTF-16 offset
if offset32 is out of bounds.
Returns the UTF-32 offset corresponding to a UTF-16 offset. Used
for random access. To find the UTF-32 length of a string, use:
len32 = findOffset32(source, source.length());
NOTE:
If the UTF-16 offset is into the middle of a surrogate pair,
then the UTF-32 offset of the end of the pair is
returned; that is, the index of the char after the end of the
pair. You can always round-trip from a UTF-32 offset to a UTF-16
offset and back. You can round-trip from a UTF-16 offset to a
UTF-32 offset and back if and only if the offset16 is not in
the middle of a surrogate pair. Unmatched surrogates count as a
single UTF-16 value.
UTF-16 offset
UTF-32 offset
if offset16 is out of bounds.
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