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Implement str/bytes rich comparisons.

This commit is contained in:
Paul Sokolovsky 2014-02-02 08:24:07 +02:00
parent 9ed5435061
commit 87e85b7dc7
4 changed files with 101 additions and 0 deletions
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1
py/obj.h
View File

@ -397,3 +397,4 @@ typedef struct _mp_obj_classmethod_t {
void mp_seq_multiply(const void *items, uint item_sz, uint len, uint times, void *dest);
bool m_seq_get_fast_slice_indexes(machine_uint_t len, mp_obj_t slice, machine_uint_t *begin, machine_uint_t *end);
#define m_seq_copy(dest, src, len, item_sz) memcpy(dest, src, len * sizeof(item_sz))
bool mp_seq_cmp_bytes(int op, const byte *data1, uint len1, const byte *data2, uint len2);

12
py/objstr.c
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@ -169,6 +169,18 @@ mp_obj_t str_binary_op(int op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
mp_seq_multiply(lhs_data, sizeof(*lhs_data), lhs_len, n, data);
return mp_obj_str_builder_end(s);
}
// These 2 are never passed here, dealt with as a special case in rt_binary_op().
//case RT_BINARY_OP_EQUAL:
//case RT_BINARY_OP_NOT_EQUAL:
case RT_BINARY_OP_LESS:
case RT_BINARY_OP_LESS_EQUAL:
case RT_BINARY_OP_MORE:
case RT_BINARY_OP_MORE_EQUAL:
if (MP_OBJ_IS_STR(rhs_in)) {
GET_STR_DATA_LEN(rhs_in, rhs_data, rhs_len);
return MP_BOOL(mp_seq_cmp_bytes(op, lhs_data, lhs_len, rhs_data, rhs_len));
}
}
return MP_OBJ_NULL; // op not supported

38
py/sequence.c
View File

@ -14,6 +14,8 @@
// Helpers for sequence types
#define SWAP(type, var1, var2) { type t = var2; var2 = var1; var1 = t; }
// Implements backend of sequence * integer operation. Assumes elements are
// memory-adjacent in sequence.
void mp_seq_multiply(const void *items, uint item_sz, uint len, uint times, void *dest) {
@ -53,3 +55,39 @@ bool m_seq_get_fast_slice_indexes(machine_uint_t len, mp_obj_t slice, machine_ui
*end = stop;
return true;
}
// Special-case comparison function for sequences of bytes
// Don't pass RT_BINARY_OP_NOT_EQUAL here
bool mp_seq_cmp_bytes(int op, const byte *data1, uint len1, const byte *data2, uint len2) {
// Let's deal only with > & >=
if (op == RT_BINARY_OP_LESS || op == RT_BINARY_OP_LESS_EQUAL) {
SWAP(const byte*, data1, data2);
SWAP(uint, len1, len2);
if (op == RT_BINARY_OP_LESS) {
op = RT_BINARY_OP_MORE;
} else {
op = RT_BINARY_OP_MORE_EQUAL;
}
}
uint min_len = len1 < len2 ? len1 : len2;
int res = memcmp(data1, data2, min_len);
if (res < 0) {
return false;
}
if (res > 0) {
return true;
}
// If we had tie in the last element...
// ... and we have lists of different lengths...
if (len1 != len2) {
if (len1 < len2) {
// ... then longer list length wins (we deal only with >)
return false;
}
} else if (op == RT_BINARY_OP_MORE) {
// Otherwise, if we have strict relation, equality means failure
return false;
}
return true;
}

50
tests/basics/string-compare.py Normal file
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@ -0,0 +1,50 @@
print("" == "")
print("" > "")
print("" < "")
print("" == "1")
print("1" == "")
print("" > "1")
print("1" > "")
print("" < "1")
print("1" < "")
print("" >= "1")
print("1" >= "")
print("" <= "1")
print("1" <= "")
print("1" == "1")
print("1" != "1")
print("1" == "2")
print("1" == "10")
print("1" > "1")
print("1" > "2")
print("2" > "1")
print("10" > "1")
print("1/" > "1")
print("1" > "10")
print("1" > "1/")
print("1" < "1")
print("2" < "1")
print("1" < "2")
print("1" < "10")
print("1" < "1/")
print("10" < "1")
print("1/" < "1")
print("1" >= "1")
print("1" >= "2")
print("2" >= "1")
print("10" >= "1")
print("1/" >= "1")
print("1" >= "10")
print("1" >= "1/")
print("1" <= "1")
print("2" <= "1")
print("1" <= "2")
print("1" <= "10")
print("1" <= "1/")
print("10" <= "1")
print("1/" <= "1")