interpreter: Add hex/octal/binary support to str and int primitives #15250
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Add support for parsing and formatting integers in hexadecimal, octal, and binary representations to complement the existing decimal support. str.to_int() now accepts strings with 0x/0o/0b prefixes and optional leading signs (+/-), enabling direct parsing of hex, octal, and binary literals while maintaining full backward compatibility with decimal strings including those with leading zeros. int.to_string() gains a new format keyword argument that accepts 'dec', 'hex', 'oct', or 'bin', allowing integers to be formatted with appropriate prefixes (0x, 0o, 0b). The format parameter works correctly with the existing fill parameter and handles negative numbers properly. Round-trip conversions are fully supported: values formatted with int.to_string(format: 'hex') can be parsed back with str.to_int(). Fixes: mesonbuild#2047 Fixes: mesonbuild#15201
dcbaker
requested changes
Nov 19, 2025
Comment on lines
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| validator=lambda x: ( | ||
| 'format must be "dec", "hex", "oct", or "bin"' | ||
| if x not in ("dec", "hex", "oct", "bin") | ||
| else None | ||
| ), |
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You can use the in_set_validator({...}) for this.
| ) | ||
| @noPosargs | ||
| @InterpreterObject.method('to_string') | ||
| def to_string_method(self, args: T.List[TYPE_var], kwargs: T.Dict[str, T.Any]) -> str: |
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While we're here, can you add a TypedDict to use as the type for kwargs here? there's plenty of examples, preferably with a Literal[] for the format.
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| if format_type == "dec": | ||
| result = str(self.held_object) | ||
| if fill > 0: | ||
| result = result.zfill(fill) | ||
| else: | ||
| result = format(self.held_object, format_codes[format_type]) | ||
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| if fill > 0: | ||
| if result.startswith("-"): | ||
| sign = "-" | ||
| prefixed = result[1:] | ||
| else: | ||
| sign = "" | ||
| prefixed = result | ||
|
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| prefix = prefixed[:2] | ||
| digits = prefixed[2:] | ||
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| total_prefix_len = len(sign) + len(prefix) | ||
| if fill > total_prefix_len: | ||
| digits = digits.zfill(fill - total_prefix_len) | ||
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| result = sign + prefix + digits |
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Can't this all be implemented as:
template = '0=#{}{}'.format(fill, format_codes[format_code))
return format(self.held_object, template)
Member
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Even easier:
return '{0:#0{fill}{format}}'.format(self.held_object, fill=fill, format=format_codes[format_code])
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Add support for parsing and formatting integers in hexadecimal, octal, and binary representations to complement the existing decimal support.
str.to_int() now accepts strings with 0x/0o/0b prefixes and optional leading signs (+/-), enabling direct parsing of hex, octal, and binary literals while maintaining full backward compatibility with decimal strings including those with leading zeros.
int.to_string() gains a new format keyword argument that accepts 'dec', 'hex', 'oct', or 'bin', allowing integers to be formatted with appropriate prefixes (0x, 0o, 0b). The format parameter works correctly with the existing fill parameter and handles negative numbers properly.
Round-trip conversions are fully supported: values formatted with
int.to_string(format: 'hex') can be parsed back with str.to_int().
Fixes: #2047
Fixes: #15201