37 lines
1.5 KiB
Python
37 lines
1.5 KiB
Python
#!/usr/bin/env python3
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"""Check structseq_repr's loop declaration and unchanged iteration order."""
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import re
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import sys
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from pathlib import Path
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source = Path(sys.argv[1] if len(sys.argv) > 1 else "cpython/Objects/structseq.c")
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match = re.search(
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r"static PyObject \*\nstructseq_repr\(PyStructSequence \*obj\)\n\{(.*?)\n\}",
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source.read_text(),
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re.S,
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)
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assert match, "structseq_repr definition not found"
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body = match.group(1)
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assert not re.search(r"for\s*\(\s*Py_ssize_t\b", body), (
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"structseq_repr: VC6 rejects the C99 loop initializer declaration; "
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"declare i in the function declaration block"
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)
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assert re.match(
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r"\s*PyTypeObject \*typ = Py_TYPE\(obj\);"
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r"\s*_PyUnicodeWriter writer;\s*Py_ssize_t i;",
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body,
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), "i must be declared without initialization in the function declaration block"
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assert len(re.findall(r"\bPy_ssize_t\s+i\s*;", body)) == 1, (
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"declare i exactly once"
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)
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assert re.search(
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r"if \(_PyUnicodeWriter_WriteChar\(&writer, '\('\) < 0\) "
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r"\{\s*goto error;\s*\}\s*"
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r"for \(i\s*=\s*0; i < VISIBLE_SIZE\(obj\); i\+\+\) \{",
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body,
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), "preserve zero initialization after '(' output, per-iteration size lookup, and increment"
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assert len(re.findall(r"\bfor\s*\(", body)) == 1, "preserve the single item loop"
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assert "typ->tp_members[i].name" in body, "preserve member-name indexing"
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assert "PyStructSequence_GET_ITEM(obj, i)" in body, "preserve item indexing"
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print("structseq_repr C89 loop declaration and iteration order: PASS")
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