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Prolog lexer backslash escape does not work properly #1479

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marijnschraagen opened this issue Jun 14, 2020 · 1 comment
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Prolog lexer backslash escape does not work properly #1479

marijnschraagen opened this issue Jun 14, 2020 · 1 comment
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@marijnschraagen
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The Prolog lexer does not recognize strings with an escaped (i.e., double) backslash.

For example the following code is valid Prolog:

writeln("abc\"def").
writeln("abc\\def").

When executed in Prolog the " and \ characters are escaped, so this results in

abc"def
abc\def

Pygments however detects a syntax error on the second line:
pygments_prolog_syntax_error
Note that the Github highlighter for Prolog does it right on the second line but now there is a problem in escaping " on the first line.

The behavior should be the same as in, e.g., Python:

print("abc\"def")
print("abc\\def")

pygments_python_syntax_ok

@Anteru Anteru self-assigned this Jun 14, 2020
@Anteru Anteru added this to the 2.11.0 milestone Nov 13, 2021
@Anteru Anteru closed this as completed in d754437 Nov 13, 2021
@Anteru
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Anteru commented Nov 13, 2021

Fixed, thanks for the report!

hwayne pushed a commit to hwayne/pygments that referenced this issue Nov 29, 2021
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