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Fix ERE repetition expressions in [[ ... =~ ERE{x,y} ]] (#54)

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Regular expressions that combine a repetition expression with
a parenthesized sub-expression throw a garbled syntax error:

$ [[ AATAAT =~ (AAT){2} ]]
ksh: syntax error: `~(E)(AAT){2} ]]
:'%Cred%h%Creseksh: syntax error: `~(E)(AAT){2} ]]
:'%Cred%h%Creseksh: syntax' unexpected

The syntax error occurs because ksh is not fully
accounting for '=~' when it runs into a curly bracket.
This fix disables the syntax error when the operator
is '=~' and adds handling for '(str){x}' (to allow for
more than one sub-expression). This bugfix and the
regression tests for it were backported from ksh93v-
2014-12-24-beta.

src/cmd/ksh93/sh/lex.c:
- Do not trigger a syntax error for '{x}' when the operator
  is '=~' and add handling for multiple parentheses when
  combined with '{x}'.

src/cmd/ksh93/tests/bracket.sh:
- Add two tests from ksh93v- to test sub-expressions
  combined with the '{x}' quantifier.
This commit is contained in:
Johnothan King 2020-07-02 10:40:15 -07:00 • committed by GitHub
parent ad9a9219f0
commit db1d539d49
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@ -8,6 +8,9 @@ Any uppercase BUG_* names are modernish shell bug IDs.
- 'read -u' will no longer crash with a memory fault when given an out of
range or negative file descriptor.
- The '=~' operator no longer raises an error if a regular expression
combines the '{x}' quantifier with a sub-expression.
2020-06-28:
- Variables created with 'typeset -RF' no longer cause a memory fault