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gwU                 @   s    d dl mZ dd Zdd ZdS )   )c_astc             C   s   t | tjstt | jtjs"| S tjg | jj}d}xh| jjD ]\}t |tjtj	frz|jj
| t||j |jd }q@|dkr|jj
| q@|jj
| q@W || _| S )a   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.
    Nr   )
isinstancer   ZSwitchAssertionErrorZstmtZCompoundZcoordZblock_itemsCaseDefaultappend_extract_nested_casestmts)Zswitch_nodeZnew_compoundZ	last_caseZchild r   $/usr/lib/python3.6/ast_transforms.pyfix_switch_cases   s    3r   c             C   s:   t | jd tjtjfr6|j| jj  t|d | dS )z Recursively extract consecutive Case statements that are made nested
        by the parser and add them to the stmts_list.
        r   Nr   )r   r
   r   r   r   r   popr	   )Z	case_nodeZ
stmts_listr   r   r   r	   b   s    r	   N) r   r   r	   r   r   r   r   <module>
   s   U