src/etc/rust_types.py

   1 import re
   2
   3
   4 class RustType(object):
   5     OTHER = "Other"
   6     STRUCT = "Struct"
   7     TUPLE = "Tuple"
   8     CSTYLE_VARIANT = "CStyleVariant"
   9     TUPLE_VARIANT = "TupleVariant"
  10     STRUCT_VARIANT = "StructVariant"
  11     ENUM = "Enum"
  12     EMPTY = "Empty"
  13     SINGLETON_ENUM = "SingletonEnum"
  14     REGULAR_ENUM = "RegularEnum"
  15     COMPRESSED_ENUM = "CompressedEnum"
  16     REGULAR_UNION = "RegularUnion"
  17
  18     STD_STRING = "StdString"
  19     STD_OS_STRING = "StdOsString"
  20     STD_STR = "StdStr"
  21     STD_SLICE = "StdSlice"
  22     STD_VEC = "StdVec"
  23     STD_VEC_DEQUE = "StdVecDeque"
  24     STD_BTREE_SET = "StdBTreeSet"
  25     STD_BTREE_MAP = "StdBTreeMap"
  26     STD_HASH_MAP = "StdHashMap"
  27     STD_HASH_SET = "StdHashSet"
  28     STD_RC = "StdRc"
  29     STD_ARC = "StdArc"
  30     STD_CELL = "StdCell"
  31     STD_REF = "StdRef"
  32     STD_REF_MUT = "StdRefMut"
  33     STD_REF_CELL = "StdRefCell"
  34
  35
  36 STD_STRING_REGEX = re.compile(r"^(alloc::(\w+::)+)String$")
  37 STD_STR_REGEX = re.compile(r"^&(mut )?str$")
  38 STD_SLICE_REGEX = re.compile(r"^&(mut )?\[.+\]$")
  39 STD_OS_STRING_REGEX = re.compile(r"^(std::ffi::(\w+::)+)OsString$")
  40 STD_VEC_REGEX = re.compile(r"^(alloc::(\w+::)+)Vec<.+>$")
  41 STD_VEC_DEQUE_REGEX = re.compile(r"^(alloc::(\w+::)+)VecDeque<.+>$")
  42 STD_BTREE_SET_REGEX = re.compile(r"^(alloc::(\w+::)+)BTreeSet<.+>$")
  43 STD_BTREE_MAP_REGEX = re.compile(r"^(alloc::(\w+::)+)BTreeMap<.+>$")
  44 STD_HASH_MAP_REGEX = re.compile(r"^(std::collections::(\w+::)+)HashMap<.+>$")
  45 STD_HASH_SET_REGEX = re.compile(r"^(std::collections::(\w+::)+)HashSet<.+>$")
  46 STD_RC_REGEX = re.compile(r"^(alloc::(\w+::)+)Rc<.+>$")
  47 STD_ARC_REGEX = re.compile(r"^(alloc::(\w+::)+)Arc<.+>$")
  48 STD_CELL_REGEX = re.compile(r"^(core::(\w+::)+)Cell<.+>$")
  49 STD_REF_REGEX = re.compile(r"^(core::(\w+::)+)Ref<.+>$")
  50 STD_REF_MUT_REGEX = re.compile(r"^(core::(\w+::)+)RefMut<.+>$")
  51 STD_REF_CELL_REGEX = re.compile(r"^(core::(\w+::)+)RefCell<.+>$")
  52
  53 TUPLE_ITEM_REGEX = re.compile(r"__\d+$")
  54
  55 ENCODED_ENUM_PREFIX = "RUST$ENCODED$ENUM$"
  56 ENUM_DISR_FIELD_NAME = "<<variant>>"
  57
  58 STD_TYPE_TO_REGEX = {
  59     RustType.STD_STRING: STD_STRING_REGEX,
  60     RustType.STD_OS_STRING: STD_OS_STRING_REGEX,
  61     RustType.STD_STR: STD_STR_REGEX,
  62     RustType.STD_SLICE: STD_SLICE_REGEX,
  63     RustType.STD_VEC: STD_VEC_REGEX,
  64     RustType.STD_VEC_DEQUE: STD_VEC_DEQUE_REGEX,
  65     RustType.STD_HASH_MAP: STD_HASH_MAP_REGEX,
  66     RustType.STD_HASH_SET: STD_HASH_SET_REGEX,
  67     RustType.STD_BTREE_SET: STD_BTREE_SET_REGEX,
  68     RustType.STD_BTREE_MAP: STD_BTREE_MAP_REGEX,
  69     RustType.STD_RC: STD_RC_REGEX,
  70     RustType.STD_ARC: STD_ARC_REGEX,
  71     RustType.STD_REF: STD_REF_REGEX,
  72     RustType.STD_REF_MUT: STD_REF_MUT_REGEX,
  73     RustType.STD_REF_CELL: STD_REF_CELL_REGEX,
  74     RustType.STD_CELL: STD_CELL_REGEX,
  75 }
  76
  77 def is_tuple_fields(fields):
  78     # type: (list) -> bool
  79     return all(TUPLE_ITEM_REGEX.match(str(field.name)) for field in fields)
  80
  81
  82 def classify_struct(name, fields):
  83     if len(fields) == 0:
  84         return RustType.EMPTY
  85
  86     for ty, regex in STD_TYPE_TO_REGEX.items():
  87         if regex.match(name):
  88             return ty
  89
  90     if fields[0].name == ENUM_DISR_FIELD_NAME:
  91         return RustType.ENUM
  92
  93     if is_tuple_fields(fields):
  94         return RustType.TUPLE
  95
  96     return RustType.STRUCT
  97
  98
  99 def classify_union(fields):
 100     if len(fields) == 0:
 101         return RustType.EMPTY
 102
 103     first_variant_name = fields[0].name
 104     if first_variant_name is None:
 105         if len(fields) == 1:
 106             return RustType.SINGLETON_ENUM
 107         else:
 108             return RustType.REGULAR_ENUM
 109     elif first_variant_name.startswith(ENCODED_ENUM_PREFIX):
 110         assert len(fields) == 1
 111         return RustType.COMPRESSED_ENUM
 112     else:
 113         return RustType.REGULAR_UNION