javascript: Got "ctags: Warning: ignoring null tag"

[masatake]

[yamato@x201]~/var/ctags-github% cat /tmp/foo.js 
if (true) {
    this[0] = function() {};
}

[yamato@x201]~/var/ctags-github% ./ctags -o - /tmp/foo.js 
ctags: Warning: ignoring null tag in /tmp/foo.js(line: 2)
[yamato@x201]~/var/ctags-github% js /tmp/foo.js 
[yamato@x201]~/var/ctags-github%

[cristianoliveira]

Is there any update on this?

Or am I doing something wrong? The code I'm trying to tag is Javascript/React :)

[cristianoliveira]

Apparently it is related to Object destructuring like:

    const { name, email } = user;

[masatake]

I have not inspected the warning well.
However, the input you gave looks valid as I tested the input on node command
I would like you to open a new issue for the input.
If you are good at JavaScript, I would like to know the specification as reference.
See #1949 (comment) how I struggled.

const { name, email } = user;

name and email should be tagged well.

[yamato@slave]~% node
> var user = {name: 'a', email: 'b'}
var user = {name: 'a', email: 'b'}
undefined
> const { name, email } = user;
const { name, email } = user;
undefined
> name
name
'a'

[cristianoliveira]

If you are good at JavaScript, I would like to know the specification as reference.

Not sure if I got your question but the specification for the Object Destructuring is on the ECMAScript specification:
https://www.ecma-international.org/ecma-262/6.0/#sec-destructuring-assignment

:)

[masatake]

Thanks. That is what I need.

[winkee01]

Why does this issue not be addressed? I've got the same problem.

[winkee01]

Thanks. That is what I need.

how did you remove the warning?

[masatake]

how did you remove the warning?

I didn't remove the warning.

[winkee01]

how did you remove the warning?

I didn't remove the warning.

well, I've got the same issue, {A, B} = some_obj can be parsed correctly by ctags.

[winkee01]

Looks like no one is going to fix this issue

[masatake]

Looks like no one is going to fix this issue

For the destructural binding, I tried once.

[jet@living]/tmp% cd /tmp
cd /tmp
[jet@living]/tmp% git clone https://github.com/masatake/ctags.git
git clone https://github.com/masatake/ctags.git
Cloning into 'ctags'...
...
[jet@living]/tmp% cd ctags
cd ctags
[jet@living]/tmp/ctags% git checkout  origin/js-destructual-binding 
git checkout  origin/js-destructual-binding 
Note: switching to 'origin/js-destructual-binding'.
...
HEAD is now at 4eeac5b9 JavaScript: support more forms of destructuring assignments
[jet@living]/tmp/ctags% bash ./autogen.sh
bash ./autogen.sh
+ type autoreconf
...
optlib2c: translating optlib/inko.ctags to optlib/inko.c
+ ./misc/optlib2c optlib/inko.ctags
+ exit 0
[jet@living]/tmp/ctags% ./configure
./configure
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
...
config.status: creating config.h
config.status: executing depfiles commands
[jet@living]/tmp/ctags% make -j 9
make -j 9
REPOINFO   main/repoinfo.h
make  all-recursive
make[1]: Entering directory '/tmp/ctags'
make[2]: Entering directory '/tmp/ctags'
...
  AR       libctags.a
  CCLD     ctags
  CCLD     mini-geany
make[2]: Leaving directory '/tmp/ctags'
make[1]: Leaving directory '/tmp/ctags'
[jet@living]/tmp/ctags% cat /tmp/bar.js 
cat /tmp/bar.js 
const { name, email } = user;

[jet@living]/tmp/ctags% ./ctags -o - /tmp/bar.js 
./ctags -o - /tmp/bar.js 
email	/tmp/bar.js	/^const { name, email } = user;$/;"	C
name	/tmp/bar.js	/^const { name, email } = user;$/;"	C

The branch introduces so many changes.
So merging it to the master branch we use daily needs more consideration.

[masatake]

this[0] = function() {};

In this case, ctags says nothing.

{
	this[0] = function() {};
}

In this case, I got a warning. This will be an important hint fix for the original input.