a
ÿ¸_^@ ã @ s d dl mZ dd„ Zdd„ ZdS )é )Úc_astc C sš t | jtjƒs| S t g | jj¡}d}| jjp0g D ]\}t |tjtjfƒrl|j |¡ t ||jƒ |jd }q2|du r‚|j |¡ q2|j
|¡ q2|| _| S )aÜ 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 is 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.
Néÿÿÿÿ) Ú
isinstanceZstmtr ZCompoundZcoordZ block_itemsÚCaseÚDefaultÚappendÚ_extract_nested_caseÚstmts)Z switch_nodeZ new_compoundZ last_caseÚchild© r ú
s V