Re: Flag atom_no_escape has no effect?

Hi,

it is not a bug, the flag controls back quoted tokens, i.e.
surrounded with a backquote ` not a quote '.

So you should use:

| ?- atom_chars(`\'`, CS).

CS = [\,'''']

Daniel

Le 23/05/2013 15:08, Yi Dai a écrit :

Hi,

I am using gprolog 1.4.4. According to the manual, by
default, the flag `back_quotes` is set to ` atom_no_escape`,
which means no escape sequence is supported inside back
quotes. But I surprisingly find that it is not the case.
Below is a dialog of an interactive session:

GNU Prolog 1.4.4 (32
bits)

Compiled Apr 29 2013,
20:41:58 with gcc

By Daniel Diaz

Copyright (C)
1999-2013 Daniel Diaz

| ?-
current_prolog_flag(back_quotes, X).

X = atom_no_escape

yes

| ?- atom_chars('''',
CS).

CS = ['''']

yes

| ?- atom_chars('\'',
CS).

CS = ['''']

yes

| ?- atom_chars('\\',
CS).

CS = [\]

yes

| ?- atom_chars('\n',
CS).

CS = ['\n']

yes

| ?-
atom_chars('\''', CS).

uncaught exception:
error(syntax_error('user_input:6 (char:23) unexpected
newline'),read_term/3)

Apparently escape sequences are still allowed. How can I
disable it? Note that turning on the flag ` strict_iso`
does not help. Is this a bug?

Regards,

Yi

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