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py: Implement str.count #244

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Merged
merged 1 commit into from
Jul 1, 2025
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py: Implement str.count #244

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41 changes: 41 additions & 0 deletions py/string.go
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Original file line number Diff line number Diff line change
Expand Up @@ -148,6 +148,13 @@ func init() {
return Bool(false), nil
}, 0, "endswith(suffix[, start[, end]]) -> bool")

StringType.Dict["count"] = MustNewMethod("count", func(self Object, args Tuple) (Object, error) {
return self.(String).Count(args)
}, 0, `count(sub[, start[, end]]) -> int
Return the number of non-overlapping occurrences of substring sub in
string S[start:end]. Optional arguments start and end are
interpreted as in slice notation.`)

StringType.Dict["find"] = MustNewMethod("find", func(self Object, args Tuple) (Object, error) {
return self.(String).find(args)
}, 0, `find(...)
Expand Down Expand Up @@ -612,6 +619,40 @@ func (s String) M__contains__(item Object) (Object, error) {
return NewBool(strings.Contains(string(s), string(needle))), nil
}

func (s String) Count(args Tuple) (Object, error) {
var (
pysub Object
pybeg Object = Int(0)
pyend Object = Int(s.len())
pyfmt = "s|ii:count"
)
err := ParseTuple(args, pyfmt, &pysub, &pybeg, &pyend)
if err != nil {
return nil, err
}

var (
beg = int(pybeg.(Int))
end = int(pyend.(Int))
size = s.len()
)
if beg > size {
beg = size
}
if end < 0 {
end = size
}
if end > size {
end = size
}

var (
str = string(s.slice(beg, end, s.len()))
sub = string(pysub.(String))
)
return Int(strings.Count(str, sub)), nil
}

func (s String) find(args Tuple) (Object, error) {
var (
pysub Object
Expand Down
9 changes: 9 additions & 0 deletions py/tests/string.py
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Original file line number Diff line number Diff line change
Expand Up @@ -944,5 +944,14 @@ def __index__(self):
else:
assert False, "TypeError not raised"

doc="count"
assert 'hello world'.count('l') == 3
assert 'hello world'.count('l', 3) == 2
assert 'hello world'.count('l', 3, 10) == 2
assert 'hello world'.count('l', 3, 100) == 2
assert 'hello world'.count('l', 3, 5) == 1
assert 'hello world'.count('l', 3, 1) == 0
assert 'hello world'.count('z') == 0


doc="finished"
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