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The grammar is:
expression: expr? EOF
expr: and_expr ('or' and_expr)*
and_expr: not_expr ('and' not_expr)*
not_expr: 'not' not_expr | '(' expr ')' | ident
ident: (\w|:|\+|-|\.|\[|\]|\\|/)+
The semantics are:
- Empty expression evaluates to False.
- ident evaluates to True of False according to a provided matcher function.
- or/and/not evaluate according to the usual boolean semantics.
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r r4 r/ rA )r( r rA �tokenr r r �acceptk s zScanner.accept)�expectedr% c C s4 t | jjd d�d�dd� |D ��| jjj���d S )Nr7 zexpected {}; got {}z OR c s s | ] }|j V qd S r& )r )�.0r r r r � <genexpr>y � z!Scanner.reject.<locals>.<genexpr>)r r0 r �format�joinr r )r( rD r r r rA u s
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�Z dS )�MatcherAdapterzDAdapts a matcher function to a locals mapping as required by eval().N��matcherr% c C s
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|| _ d S r& ra )r( rb r r r r) � s zExpression.__init__r1 c C s" t t|��}t|ddd�}t|�S )z\Compile a match expression.
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z<pytest match expression>�eval)�filename�mode)rP r. �compiler )r( r2 Zastexprrb r r r rf � s �zExpression.compilerY c C s t | jdi it|��}|S )a Evaluate the match expression.
:param matcher:
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