Stop silencing useful information.

[joelburget]

The thrown errors didn't hold any useful information and made debugging
impossible.

Before:

Error: Could not parse jison grammar

After:

Error: Parse error on line 86:
...   ;expatom    = atom '^' nat
--------------------^
Expecting ':', got 'ID'

[wavebeem]

👍 This would have been very helpful to me in the past.

[cvializ]

+1
I get useful error messages in v0.4.13, but v0.4.14 and v0.4.15 do not show useful error information any more. Please consider merging this PR or resolving the problem another way.

[nolanlawson]

Do we have any idea why the code was changed in the first place? Presumably there was a good reason to put the try/catches in there.

[gumgl]

👍 This fix works great on 0.4.15. Went from a generic "could not parse" to specific info on the syntax error. Thanks! It should be merged.

[toms-dev]

+1

[techtonik]

It is better to rethrow exceptions than silence them. This way code shows that there is an exception that might need a handler. techtonik@db44303

[mcCURS0R]

+1

[DanielSWolf]

👍

I just hacked the changed into my local copy of JISON, and suddenly I get useful error messages.

[DanielSWolf]

Seems like exception silencing got introduced with commit ea11654. The commit message doesn't mention this:

edit docs, cleanup cli.processGrammars

options argument properties are documented better. Optional and default
args specified better. jsonMode arg to cli.processGrammars means
something.

[warrenseine]

Any reason why this hasn't been merged in two years?

[techtonik]

Because @zaach is missing?

[vsych]

+1

[octachrome]

@zaach This is an essential fix for anyone developing a complex grammar. Please merge!

[techtonik]

Try https://www.npmjs.com/package/jison-gho ?

[john-burns-arundo]

Abandoned project with useless error messages...

[toms-dev]

Yep sadly... Better switch to the Typescript front-end of Antlr https://github.com/tunnelvisionlabs/antlr4ts/blob/master/README.md

…

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