| 1 | use rush_parser::ast::BraceExpansion; |
| 2 | |
| 3 | /// Expand a brace expansion pattern into a list of strings |
| 4 | pub fn expand_brace(brace: &BraceExpansion) -> Vec<String> { |
| 5 | match brace { |
| 6 | BraceExpansion::List(items) => items.clone(), |
| 7 | BraceExpansion::Sequence { start, end, increment } => { |
| 8 | expand_sequence(start, end, increment.unwrap_or(1)) |
| 9 | } |
| 10 | } |
| 11 | } |
| 12 | |
| 13 | /// Expand a sequence like {1..10} or {a..z} |
| 14 | fn expand_sequence(start: &str, end: &str, increment: i32) -> Vec<String> { |
| 15 | // Try numeric sequence first |
| 16 | if let (Ok(start_num), Ok(end_num)) = (start.parse::<i32>(), end.parse::<i32>()) { |
| 17 | expand_numeric_sequence(start_num, end_num, increment, start.len()) |
| 18 | } else if start.len() == 1 && end.len() == 1 { |
| 19 | // Try character sequence |
| 20 | let start_char = start.chars().next().unwrap(); |
| 21 | let end_char = end.chars().next().unwrap(); |
| 22 | expand_char_sequence(start_char, end_char, increment) |
| 23 | } else { |
| 24 | // Invalid sequence, return empty |
| 25 | vec![] |
| 26 | } |
| 27 | } |
| 28 | |
| 29 | /// Expand a numeric sequence: {1..10} or {01..05} |
| 30 | fn expand_numeric_sequence(start: i32, end: i32, increment: i32, width: usize) -> Vec<String> { |
| 31 | let mut result = Vec::new(); |
| 32 | |
| 33 | if increment == 0 { |
| 34 | return result; |
| 35 | } |
| 36 | |
| 37 | // Check if we should use zero-padding |
| 38 | let use_padding = width > 1; |
| 39 | |
| 40 | if start <= end && increment > 0 { |
| 41 | // Ascending |
| 42 | let mut current = start; |
| 43 | while current <= end { |
| 44 | if use_padding { |
| 45 | result.push(format!("{:0width$}", current, width = width)); |
| 46 | } else { |
| 47 | result.push(current.to_string()); |
| 48 | } |
| 49 | current += increment; |
| 50 | } |
| 51 | } else if start >= end && increment < 0 { |
| 52 | // Descending |
| 53 | let mut current = start; |
| 54 | while current >= end { |
| 55 | if use_padding { |
| 56 | result.push(format!("{:0width$}", current, width = width)); |
| 57 | } else { |
| 58 | result.push(current.to_string()); |
| 59 | } |
| 60 | current += increment; |
| 61 | } |
| 62 | } else if start > end && increment > 0 { |
| 63 | // Descending with positive increment (use negative) |
| 64 | let mut current = start; |
| 65 | while current >= end { |
| 66 | if use_padding { |
| 67 | result.push(format!("{:0width$}", current, width = width)); |
| 68 | } else { |
| 69 | result.push(current.to_string()); |
| 70 | } |
| 71 | current -= increment; |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | result |
| 76 | } |
| 77 | |
| 78 | /// Expand a character sequence: {a..z} or {Z..A} |
| 79 | fn expand_char_sequence(start: char, end: char, increment: i32) -> Vec<String> { |
| 80 | let mut result = Vec::new(); |
| 81 | |
| 82 | if increment == 0 { |
| 83 | return result; |
| 84 | } |
| 85 | |
| 86 | let start_code = start as i32; |
| 87 | let end_code = end as i32; |
| 88 | |
| 89 | if start_code <= end_code && increment > 0 { |
| 90 | // Ascending |
| 91 | let mut current = start_code; |
| 92 | while current <= end_code { |
| 93 | if let Some(ch) = char::from_u32(current as u32) { |
| 94 | result.push(ch.to_string()); |
| 95 | } |
| 96 | current += increment; |
| 97 | } |
| 98 | } else if start_code >= end_code && increment < 0 { |
| 99 | // Descending |
| 100 | let mut current = start_code; |
| 101 | while current >= end_code { |
| 102 | if let Some(ch) = char::from_u32(current as u32) { |
| 103 | result.push(ch.to_string()); |
| 104 | } |
| 105 | current += increment; |
| 106 | } |
| 107 | } else if start_code > end_code && increment > 0 { |
| 108 | // Descending with positive increment |
| 109 | let mut current = start_code; |
| 110 | while current >= end_code { |
| 111 | if let Some(ch) = char::from_u32(current as u32) { |
| 112 | result.push(ch.to_string()); |
| 113 | } |
| 114 | current -= increment; |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | result |
| 119 | } |
| 120 | |
| 121 | #[cfg(test)] |
| 122 | mod tests { |
| 123 | use super::*; |
| 124 | use rush_parser::ast::BraceExpansion; |
| 125 | |
| 126 | #[test] |
| 127 | fn test_list_expansion() { |
| 128 | let brace = BraceExpansion::List(vec![ |
| 129 | "a".to_string(), |
| 130 | "b".to_string(), |
| 131 | "c".to_string(), |
| 132 | ]); |
| 133 | assert_eq!(expand_brace(&brace), vec!["a", "b", "c"]); |
| 134 | } |
| 135 | |
| 136 | #[test] |
| 137 | fn test_numeric_sequence() { |
| 138 | let brace = BraceExpansion::Sequence { |
| 139 | start: "1".to_string(), |
| 140 | end: "5".to_string(), |
| 141 | increment: None, |
| 142 | }; |
| 143 | assert_eq!(expand_brace(&brace), vec!["1", "2", "3", "4", "5"]); |
| 144 | } |
| 145 | |
| 146 | #[test] |
| 147 | fn test_numeric_sequence_descending() { |
| 148 | let brace = BraceExpansion::Sequence { |
| 149 | start: "5".to_string(), |
| 150 | end: "1".to_string(), |
| 151 | increment: None, |
| 152 | }; |
| 153 | assert_eq!(expand_brace(&brace), vec!["5", "4", "3", "2", "1"]); |
| 154 | } |
| 155 | |
| 156 | #[test] |
| 157 | fn test_char_sequence() { |
| 158 | let brace = BraceExpansion::Sequence { |
| 159 | start: "a".to_string(), |
| 160 | end: "d".to_string(), |
| 161 | increment: None, |
| 162 | }; |
| 163 | assert_eq!(expand_brace(&brace), vec!["a", "b", "c", "d"]); |
| 164 | } |
| 165 | |
| 166 | #[test] |
| 167 | fn test_padded_numbers() { |
| 168 | let brace = BraceExpansion::Sequence { |
| 169 | start: "01".to_string(), |
| 170 | end: "05".to_string(), |
| 171 | increment: None, |
| 172 | }; |
| 173 | assert_eq!(expand_brace(&brace), vec!["01", "02", "03", "04", "05"]); |
| 174 | } |
| 175 | } |
| 176 |