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Adding split method to string class #60

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Merged
merged 6 commits into from
May 28, 2019
Merged

Adding split method to string class #60

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a8debc6
Adding split method to string class
kellrott May 17, 2019
cd235f2
Adding test for str split method
kellrott May 17, 2019
d3c579d
Fixing .split exception and added more python tests
kellrott May 24, 2019
f7ab626
Closer matching to python string split behavior
kellrott May 24, 2019
2f4feef
Fixing error message so it matches one from python3.4
kellrott May 28, 2019
e316b2b
Fixing error message to match python3.4 (previous version was python3.7)
kellrott May 28, 2019
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16 changes: 16 additions & 0 deletions py/string.go
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,22 @@ or repr(object).
encoding defaults to sys.getdefaultencoding().
errors defaults to 'strict'.`, StrNew, nil)


func init() {
StringType.Dict["split"] = MustNewMethod("split", func(self Object, value Object) (Object, error) {
selfStr := self.(String)
if valStr, ok := value.(String); ok {
ss := strings.Split(string(selfStr), string(valStr))
o := List{}
for _, j := range ss {
o.Items = append(o.Items, String(j))
}
return &o, nil
}
return nil, fmt.Errorf("Not split by string")
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This should be a TypeError

>>> str.split(8)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: descriptor 'split' requires a 'str' object but received a 'int'

}, 0, "split(sub) -> split string with sub.")
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The Python help is

    S.split([sep [,maxsplit]]) -> list of strings
    
    Return a list of the words in the string S, using sep as the
    delimiter string.  If maxsplit is given, at most maxsplit
    splits are done. If sep is not specified or is None, any
    whitespace string is a separator and empty strings are removed
    from the result.

Which makes me see that we are missing two things.

  • If sep isn't passed (or is None) in then we should be using strings.Fields in go terms (This doesn't have a maxfields parameter though.)
  • There is another optional parameter to specify the number of splits.

Here are some cases to consider

>>> "a,d,c".split(",")
['a', 'd', 'c']
>>> "a,d,c".split(",",1)
['a', 'd,c']
>>> " a   d   b   ".split()
['a', 'd', 'b']
>>> " a   d   b   ".split(None, 1)
['a', 'd   b   ']

}

// Type of this object
func (s String) Type() *Type {
return StringType
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3 changes: 3 additions & 0 deletions py/tests/string.py
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Expand Up @@ -99,6 +99,9 @@ class C():
asc="hello"
uni="£100世界𠜎" # 1,2,3,4 byte unicode characters

doc="split"
assert 4 == len(list("0,1,2,4".split(",")))

doc="ascii len"
assert len(asc) == 5

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