repl: do not consider `...` as a REPL command by shivanth · Pull Request #14467 · nodejs/node

shivanth · 2017-07-25T02:49:54Z

This fix makes ... in REPL to be considered as a javascript construct
rather than a REPL keyword

Fixes: #14426

Checklist

make -j4 test (UNIX), or vcbuild test (Windows) passes
tests and/or benchmarks are included
commit message follows commit guidelines

Affected core subsystem(s)

repl

This fix makes ... in REPL to be considered as a javascript construct rather than a REPL keyword Fixes: nodejs#14426

Trott

Thanks for the contribution! Please add a test! REPL tests can be tricky, but this is probably something that can be tested by adding something to test/parallel/test-repl.js. Additional info about our tests in general can be found in https://github.com/nodejs/node/blob/master/doc/guides/writing-tests.md

silverwind · 2017-07-25T05:08:42Z

Change looks good. For adding a test, check out https://github.com/nodejs/node/blob/master/test/parallel/test-repl.js.

TimothyGu · 2017-07-25T05:19:23Z

lib/repl.js

    // display next prompt and return.
    if (trimmedCmd) {
-      if (trimmedCmd.charAt(0) === '.' && isNaN(parseFloat(trimmedCmd))) {
+      if (trimmedCmd.charAt(0) === '.' && trimmedCmd.charAt(1) != '.' && isNaN(parseFloat(trimmedCmd))) {


Please use strict not equals, so trimmedCmd.charAt(1) !== '.'

mscdex · 2017-07-25T06:34:14Z

FWIW commit message is missing a space after the colon.

refack · 2017-07-25T09:00:41Z

@shivanth thank for your contribution 🥇. Don't be alarmed by all the reviews, as far as I can see they are just in order to make your submission even better. I would really want to see you follow up, so this PR will land.

refack · 2017-07-25T09:04:20Z

P.S. as far as I can see this change also enables ..* to be treated as a non REPL command. IMHO that's good since it's just as invalid as ...[] 👍 So when you add a test, try that as well.

shivanth · 2017-07-25T18:45:59Z

@refack The ...command seems to put the repl into an inconsistent state, it always shows up a multiline command, which can only be exited by pressing ctrl-c.


> ..save
... dad
... ()
... blah
...
>

I came across this when I tried to add a new test case

silverwind · 2017-07-25T19:11:06Z

The...command seems to put the repl into an inconsistent state

That's something that should be investigated separately. Any kind of invalid syntax does it, but is has its uses too:

> a=
... 1;
1

Same also works on the shell:

$ node -p "a=\
dquote> 1"
1

The question is if it can be determined if a line can never be valid, like ...something, so we don't show the line continuation and output the error immediately, but I guess this can get complex.

As a first step, I'm fine if you just make sure it not gets parsed as a REPL command.

shivanth · 2017-07-26T14:21:43Z

Because my test case is leaving the REPL in an inconsistent state, the tests that follow my new test fails ...

sending "...[]"
Unix data: "... ", expecting "... "
sending "ref = 1"
Unix data: "... ", expecting /^ReferenceError:\sref\sis\snot\sdefined\n\s+at\srepl:1:5/
assert.js:43
  throw new errors.AssertionError({
  ^

AssertionError [ERR_ASSERTION]: '... ' === /^ReferenceError:\sref\sis\snot\sdefined\n\s+at\srepl:1:5/

shivanth · 2017-07-26T18:11:47Z

Done 👍

shivanth · 2017-07-27T05:08:16Z

@Trott @TimothyGu

Trott · 2017-07-27T05:23:01Z

The test as it stands right now does not fail on current master so it is not testing the feature implemented here.

test added, dismissing review

Trott · 2017-07-27T20:48:35Z

@princejwesley @addaleax @Fishrock123

Fishrock123

https://ci.nodejs.org/job/node-test-pull-request/9380/

Fishrock123 · 2017-07-27T20:59:07Z

test/parallel/test-repl.js

    { client: client_unix, send: ' \t  \n',
-      expect: prompt_unix }
+      expect: prompt_unix },
+    //Do not parse `...[]` as a REPL keyword


the linter might fail due to no space between the comment start?

It passes as we do not use the spaced-comment rule. I fixed it anyways.

silverwind · 2017-07-29T08:36:11Z

Thanks, landed in 46d3ff2!

I fixed the whitespace issues in the test and wrapped the long line in lib so it passed the linter.

This fix makes ... in REPL to be considered as a javascript construct rather than a REPL keyword. Fixes: #14426 PR-URL: #14467 Reviewed-By: Roman Reiss <me@silverwind.io> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

MylesBorins · 2017-08-16T08:18:10Z

Should this be backported to v6.x-staging? If yes please follow the guide and raise a backport PR, if no let me know or add the dont-land-on label.

silverwind · 2017-08-16T15:13:22Z

I'd say so. @shivanth wanna do it?

shivanth · 2017-08-16T16:45:56Z

I'm in 👍

This fix makes ... in REPL to be considered as a javascript construct rather than a REPL keyword. Fixes: nodejs#14426 PR-URL: nodejs#14467 Reviewed-By: Roman Reiss <me@silverwind.io> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

This fix makes ... in REPL to be considered as a javascript construct rather than a REPL keyword. Fixes: #14426 Backport-PR-URL: #14915 PR-URL: #14467 Reviewed-By: Roman Reiss <me@silverwind.io> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

0joshuaolson1 · 2018-02-27T00:06:18Z

Was an issue ever created for the aforementioned problem where some syntax errors put the repl in an 'inconsistent' ... state until you Ctrl+C?

I found #18915, but its a PR...

repl:Do not consider ... as a REPL command

d5b6ec8

This fix makes ... in REPL to be considered as a javascript construct rather than a REPL keyword Fixes: nodejs#14426

nodejs-github-bot added the repl Issues and PRs related to the REPL subsystem. label Jul 25, 2017

Trott previously requested changes Jul 25, 2017

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TimothyGu reviewed Jul 25, 2017

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refack changed the title ~~repl:vDo not consider ... as a REPL command~~ repl: do not consider ... as a REPL command Jul 25, 2017

use !== instead of !=

e2a61f6

Add test for REPL

067ed99

Fix the test, add the .break command after the test

cfce5a2

Make a more concrete test case

08327ff

silverwind approved these changes Jul 27, 2017

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addaleax approved these changes Jul 27, 2017

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Fishrock123 approved these changes Jul 27, 2017

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silverwind closed this Jul 29, 2017

addaleax mentioned this pull request Aug 2, 2017

v8.3.0 proposal #14594

Merged

MylesBorins added the lts-watch-v6.x label Aug 16, 2017

shivanth mentioned this pull request Aug 18, 2017

[v6.x backport] Repl: do not consider ... as a REPL command #14915

Closed

4 tasks

MylesBorins added backported-to-v6.x and removed lts-watch-v6.x labels Sep 19, 2017

MylesBorins mentioned this pull request Sep 20, 2017

v6.11.4 proposal #15506

Merged

jagretz mentioned this pull request Sep 27, 2018

Can't npm start - destructured props - Unexpected token ... jxnblk/mdx-deck#184

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shivanth commented Jul 25, 2017 •

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