XMLParser的在權利要求菲羅U + 00A0是 「無效UTF-8」

Question

鑑於輸入： 「」

<?xml version='1.0' encoding='UTF-8' standalone='yes' ?> 
<sms body=". what" /> 

當字符之後的在短信標籤的身體屬性中是U+00A0;

我得到的錯誤：

XMLEncodingException: Invalid UTF-8 character encoding (line 2) (column 13)

IIUC，該字符的UTF-8表示爲0xC2 0xA0per Wikipedia。當然，輸入字節72和73分別是194和160。

這看起來像是XMLParser中的一個錯誤，或者我錯過了什麼？

Answer 1

由於蒙蒂光臨救援on the Pharo User's list：

You're double decoding. Use onFileNamed:/parseFileNamed: instead (and the DOM printToFileNamed: family of messages when writing) and let XMLParser take care this for you, or disable XMLParser decoding before parsing with #decodesCharacters:.

Longer explanation:

The class #on:/#parse: take either a string or a stream (read the definitions). You gave it a FileReference, but because the argument is tested with isString and sent #readStream otherwise, it didn't blowup then.

File refs sent #readStream return file streams that do automatic decoding. But XMLParser automatically attempts its own decoding too, if:

The input starts with a BOM or it can be inferred by null bytes before or after the first non-null byte.

There is an encoding declaration with a non-UTF-8 encoding.

There is a UTF-8 encoding declaration but the stream is not a normal ReadStream (your case).

So it gets decoded twice, and the decoded value of the char causes the error. I'll consider changing the heuristic to make less eager to decode.