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unicode: IsPrint('\u3000') returns false #4661

gopherbot opened this issue Jan 15, 2013 · 1 comment

unicode: IsPrint('\u3000') returns false #4661

gopherbot opened this issue Jan 15, 2013 · 1 comment


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@gopherbot gopherbot commented Jan 15, 2013

by tts.yamamoto:

What steps will reproduce the problem?

What is the expected output?
IsPrint('\u3000') returns true.

Please provide any additional information below.
U+3000 (Ideographic Space) is used as a space character in Japanese.
So It should be treated as a printable character.
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@rsc rsc commented Jan 15, 2013

Comment 1:

"IsPrint" is a Go-defined property, not a Unicode-defined one. The only space character
that satisfies IsPrint is the ASCII space. IsPrint gets used by things like %q to decide
whether to escape a rune or not. By admitting only a single space character, we make
sure that if you see something that looks like a space in a quoted string, it really is
an ASCII space, not some other Unicode space. This applies to all kinds of spaces, not
just Japanese spaces. For example, IsPrint('\u00A0') is false too.
If you want to allow all kinds of spaces, use the Unicode-defined "graphic" property,
called as unicode.IsGraphic.

Status changed to WorkingAsIntended.

@rsc rsc added this to the Go1.1 milestone Apr 14, 2015
@rsc rsc removed the go1.1 label Apr 14, 2015
@golang golang locked and limited conversation to collaborators Jun 24, 2016
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