Escape special is double applied in g2p-studio

[joanise]

The crk to crk-no-symbols mapping uses escape special to be able to map & to êkwa before we proceed to IPA.

When we run g2p convert '&' crk crk-no-symbols we get êkwa as expected.

However, in the g2p-studio, if you select input language = crk and put & in the text to convert, the output is simply &, unmapped. If you disable the Escape Special checkbox, or change \& back to & in the rule table, then things work, but with the default settings we're effectively escaping the specials twice. Indeed, the input \& gets mapped to êkwa.

Studio needs to make sure escape special is not applied twice: in change_table, what is loaded needs to be the raw table, unescaped, since escape special semantics are applied in convert() in app.py.

[joanise]

As part of fixing this bug, please delete the known_failure work-around code in g2p/tests/test_studio.py.

In fact, please make sure & always gets exercised by replacing that block of code by

langs_to_test.append(["crk", "crk-no-symbols", "&", "êkwa"])