Add str.isspace primitive

Author: VaggelisD

mypyc/lib-rt/CPy.h

@@ -780,7 +780,7 @@ Py_ssize_t CPyStr_Count(PyObject *unicode, PyObject *substring, CPyTagged start)
 Py_ssize_t CPyStr_CountFull(PyObject *unicode, PyObject *substring, CPyTagged start, CPyTagged end);
 CPyTagged CPyStr_Ord(PyObject *obj);
 PyObject *CPyStr_Multiply(PyObject *str, CPyTagged count);
-
+bool CPyStr_IsSpace(PyObject *str);
 
 // Bytes operations
 

mypyc/lib-rt/str_ops.c

@@ -630,3 +630,17 @@ PyObject *CPyStr_Multiply(PyObject *str, CPyTagged count) {
     }
     return PySequence_Repeat(str, temp_count);
 }
+
+
+bool CPyStr_IsSpace(PyObject *str) {
+    Py_ssize_t len = PyUnicode_GET_LENGTH(str);
+    if (len == 0) return false;
+
+    int kind = PyUnicode_KIND(str);
+    const void *data = PyUnicode_DATA(str);
+    for (Py_ssize_t i = 0; i < len; i++) {
+        if (!Py_UNICODE_ISSPACE(PyUnicode_READ(kind, data, i)))
+            return false;
+    }
+    return true;
+}

mypyc/primitives/str_ops.py

@@ -397,6 +397,14 @@
     error_kind=ERR_NEG_INT,
 )
 
+method_op(
+    name="isspace",
+    arg_types=[str_rprimitive],
+    return_type=bool_rprimitive,
+    c_function_name="CPyStr_IsSpace",
+    error_kind=ERR_NEVER,
+)
+
 # obj.decode()
 method_op(
     name="decode",

mypyc/test-data/fixtures/ir.py

@@ -131,6 +131,7 @@ def removeprefix(self, prefix: str, /) -> str: ...
     def removesuffix(self, suffix: str, /) -> str: ...
     def islower(self) -> bool: ...
     def count(self, substr: str, start: Optional[int] = None, end: Optional[int] = None) -> int: pass
+    def isspace(self) -> bool: ...
 
 class float:
     def __init__(self, x: object) -> None: pass

mypyc/test-data/irbuild-str.test

@@ -972,3 +972,14 @@ def i_times_s(s, n):
 L0:
     r0 = CPyStr_Multiply(s, n)
     return r0
+
+[case testStrIsSpace]
+def is_space(x: str) -> bool:
+    return x.isspace()
+[out]
+def is_space(x):
+    x :: str
+    r0 :: bool
+L0:
+    r0 = CPyStr_IsSpace(x)
+    return r0

mypyc/test-data/run-strings.test

@@ -1257,3 +1257,25 @@ FMT: Final = "{} {}"
 
 def test_format() -> None:
     assert FMT.format(400 + 20, "roll" + "up") == "420 rollup"
+
+[case testIsSpace]
+def test_isspace_basic() -> None:
+    assert " ".isspace()
+    assert "\t".isspace()
+    assert "\n".isspace()
+    assert "\r".isspace()
+    assert "\f".isspace()
+    assert "\v".isspace()
+    assert "  \t\n".isspace()
+    assert not "".isspace()
+    assert not "a".isspace()
+    assert not " a".isspace()
+    assert not "a ".isspace()
+    assert not "hello".isspace()
+
+def test_isspace_unicode() -> None:
+    assert "\u00A0".isspace()
+    assert "\u2000".isspace()
+    assert "\u200A".isspace()
+    assert "\u3000".isspace()
+    assert not "\u0041".isspace()