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A post-modern development environment.
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8.0 kB · 235 lines
Rust
at master
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236const SEPARATOR: char = '_';
/// Increment an integer.////// Supported bases:/// 2 with prefix 0b/// 8 with prefix 0o/// 10 with no prefix/// 16 with prefix 0x////// An integer can contain `_` as a separator but may not start or end with a separator./// Base 10 integers can go negative, but bases 2, 8, and 16 cannot./// All addition and subtraction is saturating.pub fn increment(selected_text: &str, amount: i64) -> Option<String> { if selected_text.is_empty() || selected_text.ends_with(SEPARATOR) || selected_text.starts_with(SEPARATOR) { return None; }
let radix = if selected_text.starts_with("0x") { 16 } else if selected_text.starts_with("0o") { 8 } else if selected_text.starts_with("0b") { 2 } else { 10 };
// Get separator indexes from right to left. let separator_rtl_indexes: Vec<usize> = selected_text .chars() .rev() .enumerate() .filter_map(|(i, c)| if c == SEPARATOR { Some(i) } else { None }) .collect();
let word: String = selected_text.chars().filter(|&c| c != SEPARATOR).collect();
let mut new_text = if radix == 10 { let number = &word; let value = i128::from_str_radix(number, radix).ok()?; let new_value = value.saturating_add(amount as i128);
let format_length = match (value.is_negative(), new_value.is_negative()) { (true, false) => number.len() - 1, (false, true) => number.len() + 1, _ => number.len(), } - separator_rtl_indexes.len();
if number.starts_with('0') || number.starts_with("-0") { format!("{:01$}", new_value, format_length) } else { format!("{}", new_value) } } else { let number = &word[2..]; let value = u128::from_str_radix(number, radix).ok()?; let new_value = (value as i128).saturating_add(amount as i128); let new_value = if new_value < 0 { 0 } else { new_value }; let format_length = selected_text.len() - 2 - separator_rtl_indexes.len();
match radix { 2 => format!("0b{:01$b}", new_value, format_length), 8 => format!("0o{:01$o}", new_value, format_length), 16 => { let (lower_count, upper_count): (usize, usize) = number.chars().fold((0, 0), |(lower, upper), c| { ( lower + c.is_ascii_lowercase() as usize, upper + c.is_ascii_uppercase() as usize, ) }); if upper_count > lower_count { format!("0x{:01$X}", new_value, format_length) } else { format!("0x{:01$x}", new_value, format_length) } } _ => unimplemented!("radix not supported: {}", radix), } };
// Add separators from original number. for &rtl_index in &separator_rtl_indexes { if rtl_index < new_text.len() { let new_index = new_text.len().saturating_sub(rtl_index); if new_index > 0 { new_text.insert(new_index, SEPARATOR); } } }
// Add in additional separators if necessary. if new_text.len() > selected_text.len() && !separator_rtl_indexes.is_empty() { let spacing = match separator_rtl_indexes.as_slice() { [.., b, a] => a - b - 1, _ => separator_rtl_indexes[0], };
let prefix_length = if radix == 10 { 0 } else { 2 }; if let Some(mut index) = new_text.find(SEPARATOR) { while index - prefix_length > spacing { index -= spacing; new_text.insert(index, SEPARATOR); } } }
Some(new_text)}
#[cfg(test)]mod test { use super::*;
#[test] fn test_increment_basic_decimal_numbers() { let tests = [ ("100", 1, "101"), ("100", -1, "99"), ("99", 1, "100"), ("100", 1000, "1100"), ("100", -1000, "-900"), ("-1", 1, "0"), ("-1", 2, "1"), ("1", -1, "0"), ("1", -2, "-1"), ];
for (original, amount, expected) in tests { assert_eq!(increment(original, amount).unwrap(), expected); } }
#[test] fn test_increment_basic_hexadecimal_numbers() { let tests = [ ("0x0100", 1, "0x0101"), ("0x0100", -1, "0x00ff"), ("0x0001", -1, "0x0000"), ("0x0000", -1, "0x0000"), ("0xffffffffffffffff", 1, "0x10000000000000000"), ("0xffffffffffffffff", 2, "0x10000000000000001"), ("0xffffffffffffffff", -1, "0xfffffffffffffffe"), ("0xABCDEF1234567890", 1, "0xABCDEF1234567891"), ("0xabcdef1234567890", 1, "0xabcdef1234567891"), ];
for (original, amount, expected) in tests { assert_eq!(increment(original, amount).unwrap(), expected); } }
#[test] fn test_increment_basic_octal_numbers() { let tests = [ ("0o0107", 1, "0o0110"), ("0o0110", -1, "0o0107"), ("0o0001", -1, "0o0000"), ("0o7777", 1, "0o10000"), ("0o1000", -1, "0o0777"), ("0o0107", 10, "0o0121"), ("0o0000", -1, "0o0000"), ("0o1777777777777777777777", 1, "0o2000000000000000000000"), ("0o1777777777777777777777", 2, "0o2000000000000000000001"), ("0o1777777777777777777777", -1, "0o1777777777777777777776"), ];
for (original, amount, expected) in tests { assert_eq!(increment(original, amount).unwrap(), expected); } }
#[test] fn test_increment_basic_binary_numbers() { let tests = [ ("0b00000100", 1, "0b00000101"), ("0b00000100", -1, "0b00000011"), ("0b00000100", 2, "0b00000110"), ("0b00000100", -2, "0b00000010"), ("0b00000001", -1, "0b00000000"), ("0b00111111", 10, "0b01001001"), ("0b11111111", 1, "0b100000000"), ("0b10000000", -1, "0b01111111"), ("0b0000", -1, "0b0000"), ( "0b1111111111111111111111111111111111111111111111111111111111111111", 1, "0b10000000000000000000000000000000000000000000000000000000000000000", ), ( "0b1111111111111111111111111111111111111111111111111111111111111111", 2, "0b10000000000000000000000000000000000000000000000000000000000000001", ), ( "0b1111111111111111111111111111111111111111111111111111111111111111", -1, "0b1111111111111111111111111111111111111111111111111111111111111110", ), ];
for (original, amount, expected) in tests { assert_eq!(increment(original, amount).unwrap(), expected); } }
#[test] fn test_increment_with_separators() { let tests = [ ("999_999", 1, "1_000_000"), ("1_000_000", -1, "999_999"), ("-999_999", -1, "-1_000_000"), ("0x0000_0000_0001", 0x1_ffff_0000, "0x0001_ffff_0001"), ("0x0000_0000", -1, "0x0000_0000"), ("0x0000_0000_0000", -1, "0x0000_0000_0000"), ("0b01111111_11111111", 1, "0b10000000_00000000"), ("0b11111111_11111111", 1, "0b1_00000000_00000000"), ];
for (original, amount, expected) in tests { assert_eq!(increment(original, amount).unwrap(), expected); } }
#[test] fn test_leading_and_trailing_separators_arent_a_match() { assert_eq!(increment("9_", 1), None); assert_eq!(increment("_9", 1), None); assert_eq!(increment("_9_", 1), None); }}