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�@s ddlmZdd�Zdd�ZdS)�)�c_astcCs�t|jtj�s|Stjg|jj�}d}xh|jjD]\}t|tjtjf�rj|jj|�t	||j�|jd}q0|dkr�|jj|�q0|j
j|�q0W||_|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���)�
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�$/usr/lib/python3.6/ast_transforms.py�fix_switch_cases
s4rcCs:t|jdtjtjf�r6|j|jj��t|d|�dS)z� Recursively extract consecutive Case statements that are made nested
        by the parser and add them to the stmts_list.
    �rNr)rr	rrrr�popr)Z	case_nodeZ
stmts_listr
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