Support backslash line continuations in lark.lark - #1626
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The lark.lark meta-grammar did not accept backslash-newline line continuations, even though grammars parsed by lark support them. Add a BACKSLASH terminal and ignore it, plus a regression test.
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Fixes #1620.
lark.lark(the meta-grammar used to parse Lark grammars) does not accept backslash-newline line continuations, even though grammars parsed by Lark support them. Loading a grammar that uses a line continuation viaLark.open_from_package('lark', 'lark.lark', ...)raisesUnexpectedCharacters.Change
BACKSLASHterminal matching\\[ ]*\nand%ignoreit, mirroring howWS_INLINEandCOMMENTare handled.test_line_breaks_in_lark_larkcovering the case.Verification
Run against the new test:
lark.larkchange: fails withUnexpectedCharacters