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Ocaml backends do not lex escape sequences in Char #452

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andreasabel opened this issue Jul 26, 2023 · 0 comments
Closed

Ocaml backends do not lex escape sequences in Char #452

andreasabel opened this issue Jul 26, 2023 · 0 comments
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@andreasabel
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bug lexer Concerning the generated lexer OCaml
Milestone
2.9.5

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@andreasabel
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unescapeInitTail is only called for String, not for `Char:

bnfc/source/src/BNFC/Backend/OCaml/CFtoOCamlLex.hs

Lines 195 to 200 in b1ecdb7

-- strings
, ( "'\\\"' (([^ '\\\"' '\\\\' '\\n']) | ('\\\\' ('\\\"' | '\\\\' | '\\\'' | 'n' | 't' | 'r')))* '\\\"'"
, "TOK_String (unescapeInitTail (lexeme lexbuf))" )
-- chars
, ( "'\\'' (([^ '\\\'' '\\\\']) | ('\\\\' ('\\\\' | '\\\'' | 'n' | 't' | 'r'))) '\\\''"
, "TOK_Char (lexeme lexbuf).[1]")

This causes e.g. a tab character to be lexed as backslash.
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bug lexer Concerning the generated lexer OCaml
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