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� g�wUc @ s& d d l m Z d � Z d � Z d S( i ( t c_astc C s� t | j t j � s | St j g | j j � } d } x� | j j D]� } t | t j t j f � r� | j j | � t | | j � | j d } qD | d k r� | j j | � qD | j j | � qD W| | _ | S( s� The 'case' statements in a 'switch' come out of parsing with one child node, so subsequent statements are just tucked to the parent Compound. Additionally, consecutive (fall-through) case statements come out messy. This is a peculiarity of the C grammar. The following: switch (myvar) { case 10: k = 10; p = k + 1; return 10; case 20: case 30: return 20; default: break; } Creates this tree (pseudo-dump): Switch ID: myvar Compound: Case 10: k = 10 p = k + 1 return 10 Case 20: Case 30: return 20 Default: break The goal of this transform it to fix this mess, turning it into the following: Switch ID: myvar Compound: Case 10: k = 10 p = k + 1 return 10 Case 20: Case 30: return 20 Default: break A fixed AST node is returned. The argument may be modified. i����N( t isinstancet stmtR t Compoundt coordt Nonet block_itemst Caset Defaultt appendt _extract_nested_caset stmts( t switch_nodet new_compoundt last_caset child( ( s< /usr/lib/python2.7/site-packages/pycparser/ast_transforms.pyt fix_switch_cases s 4 c C sP t | j d t j t j f � rL | j | j j � � t | d | � n d S( s� Recursively extract consecutive Case statements that are made nested by the parser and add them to the stmts_list. i i����N( R R R R R R t popR ( t case_nodet stmts_list( ( s< /usr/lib/python2.7/site-packages/pycparser/ast_transforms.pyR b s "N( t R R R ( ( ( s< /usr/lib/python2.7/site-packages/pycparser/ast_transforms.pyt <module> s U
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