view .hgtags @ 23993:eedade006458

revset: introduce _parsealiasdefn to parse alias definitions strictly

This patch introduces "_parsealiasdefn" to parse alias definitions
strictly. For example, it can avoid problems below, which current
implementation can't.

  - the shorter name argument breaks referring the longer name one in
    the definition, if the former is completely prefix of the latter

    for example, the alias definition "foo($1, $10) = $1 or $10" is
    parsed as "_aliasarg('$1') or _aliasarg('$1')0" and causes parse
    error, because tail "0" of "_aliasarg('$1')0" is invalid.

  - argument names in the quoted string are broken

    for example, the definition "foo($1) = $1 or desc('$1')" is parsed
    as "_aliasarg('$1') or desc('_aliasarg(\'$1\')')" and causes
    unexpected description matching against not '$1' but '_aliasarg(\'$1\')'.

To decrease complication of patch, current implementation for alias
definitions is replaced by "_parsealiasdefn" in the subsequent
patch. This patch just introduces it.

This patch defines "_parsealiasdefn" not as a method of "revsetalias"
class but as a one of "revset" module, because of ease of testing by
doctest.

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