error: Undefined character escape in quoted atom or string: `\N' .

[Harshita Jhavar]

error: Undefined character escape in quoted atom or string: `\N' . 

I am trying to pass parsed output of English text through a tool build in prolog. It has nouns desribed in it as '\N'. The compiler is taking it as escape sequence and giving the above mentioned error. If you will suggest me to put \\ instead of \, then, let me clarify, I don't want to do this manually every time. I remember there is some command which i can use in the terminal to silent this error. Can you please help me with that command or a better solution. I am using Ubuntu 14.04. Thanks

[Harshita Jhavar]

Also, when I add \\ manually, then it shows prolog initialisation failed.

[Jan Wielemaker]

Well, you've got to feed the compiler with valid Prolog text one way
or another. It it is not (valid) Prolog text, you either have to use
some external tool to make it valid or write a Prolog program that reads
the input character-by-character, parses it and then process it.

The simplest is probably to fix the tool that produces the \N to produce
\\N. If you have a lot of data, something like `sed -i 's/\\N/\\\\N/g'
*.input` will probably do the job (make a backup first!)

Cheers --- Jan

[Shishir Kumar]

Hi Harshita,

You found any solution for this? I am also facing the same error.

[Jan Wielemaker]

On 06/19/2015 10:24 AM, Shishir Kumar wrote:
> Hi Harshita,
>
> You found any solution for this? I am also facing the same error.

You can't avoid that. '\N' is illegal Prolog syntax. Old versions
did accept it without an error, but '\N' was the same as 'N', which
isn't very helpful either.

There are just two options: either use some script that turns the
parser output into proper Prolog syntax or, typically easier and
cleaner, write a Prolog parser for the output of the English parser.

Cheers --- Jan

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