Function parse_int 

pub fn parse_int(s: &str) -> Option<usize>

Parses a string representing a number and returns it as a usize.

The input string can be in decimal or hexadecimal format:

• Decimal numbers are parsed normally (e.g., "123").
• Hexadecimal numbers must be prefixed with "0x" (e.g., "0x7B").
• Underscores can be used as visual separators (e.g., "1_000" or "0x1_F4").

If the input string is not a valid number in the specified format, None is returned.

Examples

use forc_debug::cli::parse_int;
/// Use underscores as separators in decimal and hexadecimal numbers
assert_eq!(parse_int("123"), Some(123));
assert_eq!(parse_int("1_000"), Some(1000));

/// Parse hexadecimal numbers with "0x" prefix
assert_eq!(parse_int("0x7B"), Some(123));
assert_eq!(parse_int("0x1_F4"), Some(500));

/// Handle invalid inputs gracefully
assert_eq!(parse_int("abc"), None);
assert_eq!(parse_int("0xZZZ"), None);
assert_eq!(parse_int(""), None);

Errors

Returns None if the input string contains invalid characters, is not properly formatted, or cannot be parsed into a usize.