Invisible characters unwanted

Benoît Lechat

Hello everyone,
Really strange problem with Notepad++ here…
It comes an invisible characters between the others letters at certain point of my html code.
So my code doesn’t work.
Where does it come from ? Do you have a solution such as “search and replace” ?
Check this file below : just before the F letter of FE-000-2. If I try to delete the character ", I have to press 2 times on backspace !
https://drive.google.com/open?id=0B-tMAt7OX-3OSFNjTFJVNkk3VEU

Thx for help

sambuccid

I don’t see character

Claudia Frank

@Benoît-Lechat

Where does it come from ?

Could it be that you played with different encodings? Copy and pasted from different sources?

Cheers
Claudia

Benoît Lechat

I copied the text from an ancient website but from the browser and not from the code self

AdrianHHH

A hex dump of the downloaded file shows as below. There appear to be the three bytes E2 80 8B between the double quote and the ‘F’. I do not know what they represent or why Notepad++ does not show anything for them.

 000000   3C646976 20636C61   |<div cla|
 000008   73733D22 6D6F6461   |ss="moda|
 000010   6C206661 64652070   |l fade p|
 000018   726F6475 63745F76   |roduct_v|
 000020   69657722 2069643D   |iew" id=|
 000028   22E2808B 46452D30   |"...FE-0|
 000030   30302D32 223E       |00-2">  |

PeterJones

I originally assumed it was Unicode encoded in UTF-8. In UTF-8, bytes starting with a most-significant-bit of 1 (0x80 - 0xFF) are part of an encoded Unicode codepoint beyond U+007F, and when the first nibble in the encoded codepoint (the first hex character) is an E, it indicates that the codepoint is spread across thee bytes:

1110_xxxx   10yy_yyyy   10zz_zzzz       the three bytes of codepoint, showing the "prefixes" and the arbitrary characters x,b,c
E0          82          8B              the three values from your document
1110_0000   1000_0010   1000_1011       ... converted to binary
     0000     00 0010     00 1011       get rid of the
0000_00_0010_00_1011                    compress the space
0000_0000_1000_1011                     regroup to nibbles
U+008B                                  convert to hex unicode

U+008B is a control character.

Oddly, U+008B should have been represented with only two bytes, not three: C2 8B, so I’m not sure why your browser gave you those three bytes when you copied, unless the browser wasn’t really presenting UTF-8. Windows-1252 (Latin-1) would be à‚‹. In CP850/OEM850 (“Multilingual”, which also calls itself Latin I in some documents), it is Óéï. In DOS CodePage 437 (which I cannot find in Notepad++ Encoding list, but it’s the one that had the old box-drawing characters), it would have been αéï. None of those strings make sense as being likely; maybe the browser misinterpreted or misencoded something when you copied from the browser, or over the years, whatever encoding was originally there had been corrupted into those three bytes.

I tried an experiment, and took your example file, and appended the hex characters 2020C28B2020 (two spaces, the proper UTF-8 encoding of U+008B, and two more spaces) – Notepad++ doesn’t display the E0828B as anything, but does display the C28B as [PLD]. So it’s looking like Notepad++ just doesn’t display anything for an invalid UTF-8 sequence, but does display something for UTF-8 control-codes

AdrianHHH

Peter, great on how to convert, but I think you transcribed the hex values wrongly. You converted E0 82 8B but I believe the values in the file are E2 80 8B. When I convert these using your method I get U+400B and it is described as “Unicode Han Character ‘(same as U+9E7D 鹽) salt’ (U+400B)”.

PeterJones

Oops. Actually, we were both wrong. It was E2 80 8B, but that decodes into…

1110_xxxx 10yy_yyyy 10zz_zzzz
E2        80        8B
1110 0010 1000 0000 1000 1011
     0010   00 0000   00 1011
0010_00_0000_00_1011
0010_0000_0000_1011
U+200B

U+200B is the Zero Width Space. And suddenly the lack of a glyph (or, rather, not seeing anything) in Notepad++ makes perfect sense! Of course you won’t see a zero-width space. ☺

Thanks.

guy038

Hello, @benoît-lechat, @adrianHHH, @peterjones, and All,

For UTF-8 files, I very often use this simple and useful tool :

http://www.cogsci.ed.ac.uk/~richard/utf-8.cgi?

For instance, given the line of Benoît’s example, from the link :

https://drive.google.com/file/d/0B-tMAt7OX-3OSFNjTFJVNkk3VEU/view

Select all that line and paste in a N++ new tab
Now, place the cursor, right before the opening double-quote of the string “FE-000-2”
Hit the Right Arrow, to be at the location, right after the " character
Then hit the Shift + Right Arrow shortcut to select this unknown character
Copy it, with the Ctrl + C shortcut
Open the following UTF-8 tool : http://www.cogsci.ed.ac.uk/~richard/utf-8.cgi?
Paste it, with the Ctrl + V shortcut, in the box, at the top of the page
Choose the Interpret as character option
Finally, click on the Go button

=> You’ll get the Zero Width space character :-))

You may, either :

Enter the text E2 80 8B, with a space separator character, between bytes
Choose the Interpret as Hex UTF-8 Bytes option
Click on the Go button

You could also :

Enter the text 200B, without any space character ( Hexadecimal Unicode code-point number )
Choose the Interpret as Hex code-point option
Click on the Go button

To end with :

Enter the text 8203 ( Decimal Unicode code-point number )
Choose the Interpret as Decimal code-point option
Click on the Go button

Each time, you’ll get, again, the Zero Width space character :-))

Best Regards,

guy038

P.S. :

You can get additional and useful information on the zero-width space (ZWSP) character, from the link, below :

https://en.wikipedia.org/wiki/Zero-width_space

Stella Micheal

This post is deleted!

Nathan Harvey

But Shouldn’t we be able to see all the characters (including Zero-width space) if we use the menu option View↘Show Symbol↘Show All Characters ?

This seems like a menu function that doesn’t work as described (ALL characters should include weird control characters and “noop” characters like zero-width space).

Claudia Frank

@Nathan-Harvey

I’m feeling the same, as long as the underlying font is able to represent it, it should be displayed,
even when not using show all symbols.

Cheers
Claudia

Claudia Frank

and it is shown

What am I missing here?

Cheers
Claudia

PeterJones

@Claudia-Frank ,

I think what you’re missing is that your font doesn’t have a glyph for the character, so shows the ? in a box.

My font, DejaVu Sans Mono, has a glyph for that character, which is a zero-width glyph, so you cannot see it (because it’s there, but zero-width). But I can highlight it (see the little green highlight on the first line, and the “Sel: 1|1” on the status bar.

@Nathan-Harvey , I think Notepad++ and my font are doing the right thing: there is a character (Zero-Width Space), and it is being shown, as zero-width. It’s not a control-character, so it doesn’t have a default CR LF-style box-glyph from show-all-characters.

However, using the PythonScript plugin (that Claudia’s screenshot implied), you can run editor.setRepresentation(u'\u200B', "ZWS") to get it to replace the normal zero-width space with ZWS in a black box (similar to the CR and LF boxes). To clear that alternate representation, editor.clearRepresentation(u'\u200B'). (There is similar notation for the NppExec plugin as well, but I do not know how to represent a unicode string in its syntax.)

By saving that to a script, and using the PythonScript Configuration menu to add that script to the Plugins > PythonScript menu, you can actually then assign a keyboard shortcut using Settings > Shortcut Mapper > Plugin Commands. If you make two scripts

# script = Show ZeroWidth Characters (give them a non-zero-width representation)
editor.setRepresentation(u'\u200B', "ZWS")
editor.setRepresentation(u'\u200C', "ZWNJ")
editor.setRepresentation(u'\u200D', "ZWJ")
editor.setRepresentation(u'\uFEFF', "ZWNBSP")

# script = Default ZeroWidth Characters (return them to their zero-width glyph from the selected font)
editor.clearRepresentation(u'\u200B')
editor.clearRepresentation(u'\u200C')
editor.clearRepresentation(u'\u200D')
editor.clearRepresentation(u'\uFEFF')

you can get all the “zero width” unicode characters that I can find to toggle visibility

Claudia Frank

@PeterJones

Peter, thank you very much for your insight.
You could be and I already start thinking you are right about the glyph and my used font.
I still feel it should be the other way around as I don’t like to have an invisible char in my code
and wondering why it doesn’t do what it is supposed to do but than, on the other side, it doesn’t make sense to have a zero-width char. Hmmm.
I guess I’m good as I can use my font or using setRepresentation function to see any “invisible” chars :-)
Your explanation makes sense - absolutely.

Thank you very much.
Claudia

PeterJones

Also, if you want one command to do the normal Show All Characters plus showing these four Zero Width characters,

    # script = Show All Characters (including ZeroWidth)
    editor.setRepresentation(u'\u200B', "ZWS")
    editor.setRepresentation(u'\u200C', "ZWNJ")
    editor.setRepresentation(u'\u200D', "ZWJ")
    editor.setRepresentation(u'\uFEFF', "ZWNBSP")
    # if you want to _also_ show all characters with this script,
    #   first pick a different View > Show Symbols option,
    #   then pick this one (each is a toggle, so don't want to accidentally hide all characters if show-all was already selected)
    notepad.menuCommand(MENUCOMMAND.VIEW_EOL)
    notepad.menuCommand(MENUCOMMAND.VIEW_ALL_CHARACTERS)

And similarly to un-set Show All Characters as well as clearing the four Zero Width representations:

    # script = Don'tShow All Characters (including ZeroWidth)
    editor.clearRepresentation(u'\u200B')
    editor.clearRepresentation(u'\u200C')
    editor.clearRepresentation(u'\u200D')
    editor.clearRepresentation(u'\uFEFF')
    # if you want to _also_ hide all characters with this script,
    #   first pick a different View > Show Symbols option,
    #   then pick this one twice (each is a toggle, so don't want to accidentally show all characters if show-all was already cleared)
    notepad.menuCommand(MENUCOMMAND.VIEW_EOL)
    notepad.menuCommand(MENUCOMMAND.VIEW_ALL_CHARACTERS)
    notepad.menuCommand(MENUCOMMAND.VIEW_ALL_CHARACTERS)

As explained in my comments, I use the VIEW_EOL to change out of VIEW_ALL_CHARACTERS, no matter what the state of the VIEW_ALL_CHARACTERS toggle is; then I use VIEW_ALL_CHARACTERS once to set it or twice to clear it. If, instead, you’d like your DontShowAllCharacters to revert to “Show EOL” or “Show Whitespace and Tab”, then instead of VIEW_EOL/VIEW_ALL_CHARACTERS/VIEW_ALL_CHARACTERS sequence of three, you could just use VIEW_EOL (a sequence of one to show EOL) or VIEW_TAB_SPACE. (Though, to be safe, you might want a two-sequence of VIEW_ALL_CHARACTERS/VIEW_EOL or VIEW_ALL_CHARACTERS/VIEW_TAB_SPACE. It would be easier if there were a notepad.getMenuCommandState() or similar command that reads back the current state of a toggled menu command.)

Claudia Frank

@PeterJones

thx,
there are editor.getViewEOL() and editor.getViewWS() functions available
to retrieve current state. But instead of using setView… I would recommend using
notepad.menuCommand(MENUCOMMAND…) to be in sync with notepad++ itself.

Cheers
Claudia

Alan Kilborn

@PeterJones

I’ve noticed that after doing an editor.setRepresentation() it shows the new character representation in the currently active tab, but if I switch tabs to one which also has characters that should be shown by this, they aren’t shown. Switching back to the tab I started in, the representation I set has also disappeared.

I think I know why this is (well, kinda, :-) ), but I’m surprised it wasn’t mentioned before in this thread.

Alan Kilborn

@Alan-Kilborn said in Invisible characters unwanted:

I’ve noticed that after doing an editor.setRepresentation() it shows the new character representation in the currently active tab, but if I switch tabs to one which also has characters that should be shown by this, they aren’t shown. Switching back to the tab I started in, the representation I set has also disappeared.

Here’s a little script to avoid that problem, I call it SetRepresentationForSpecialCharacters.py :

# -*- coding: utf-8 -*-

from Npp import editor, notepad, NOTIFICATION

class SRFSC(object):

    def __init__(self):
        notepad.callback(self.callback_npp_BUFFERACTIVATED, [NOTIFICATION.BUFFERACTIVATED])
        self.callback_npp_BUFFERACTIVATED(None)

    def callback_npp_BUFFERACTIVATED(self, args):
        editor.setRepresentation(u'\u200B', "ZWS")
        editor.setRepresentation(u'\u200C', "ZWNJ")
        editor.setRepresentation(u'\u200D', "ZWJ")
        editor.setRepresentation(u'\u200E', "LTR")  # left-to-right mark
        editor.setRepresentation(u'\uFEFF', "ZWNBSP")

I run it from my startup.py with this segment of code:

import SetRepresentationForSpecialCharacters
SetRepresentationForSpecialCharacters.SRFSC()

PeterJones

@Alan-Kilborn said in Invisible characters unwanted:

editor.setRepresentation(u'\u200E', "LTR")  # left-to-right mark`

Apparently this LTR issue is really annoying to you. :-)

Looking at http://www.fileformat.info/info/unicode/block/general_punctuation/images.htm, there are other control characters in that block, so if your data is more varied, I might expand that to:

    # zero width in name
    editor.setRepresentation(u'\u200B', "ZWS")
    editor.setRepresentation(u'\u200C', "ZWNJ")
    editor.setRepresentation(u'\u200D', "ZWJ")
    editor.setRepresentation(u'\uFEFF', "ZWNBSP")
    # also zero width
    editor.setRepresentation(u'\u2060', "WJ")       # word joiner (separate from ZWJ, but still claims zero width)
    # directional controls and other toggles
    editor.setRepresentation(u'\u200E', "LTR")  # left-to-right mark
    editor.setRepresentation(u'\u200F', "RTL")  # right-to-left mark
    editor.setRepresentation(u'\u202A', "EMBL")  # left-to-right embedding
    editor.setRepresentation(u'\u202B', "EMBR")  # right-to-left embedding
    editor.setRepresentation(u'\u202C', "EMBP")  # pop directional formatting
    editor.setRepresentation(u'\u202A', "OVRL")  # left-to-right override
    editor.setRepresentation(u'\u202B', "OVRR")  # right-to-left override
    editor.setRepresentation(u'\u2066', "ISOL")  # left-to-right isolate
    editor.setRepresentation(u'\u2067', "ISOR")  # right-to-left isolate
    editor.setRepresentation(u'\u2068', "ISO1")  # first strong isolate
    editor.setRepresentation(u'\u2069', "ISOP")  # pop directional isolate
    editor.setRepresentation(u'\u206A', "SYMI")  # inhibit symmetric swapping
    editor.setRepresentation(u'\u206B', "SYMA")  # activate symmetric swapping
    editor.setRepresentation(u'\u206C', "ARAI")  # inhibit arabic form shaping
    editor.setRepresentation(u'\u206D', "ARAA")  # activate arabic form shaping
    editor.setRepresentation(u'\u206E', "SHNA")  # national digit shapes
    editor.setRepresentation(u'\u206E', "SHNO")  # nominal digit shapes

But, most important is to include the characters that you, as the user of the script, might run across.