Mercurial > hg
annotate rust/hg-core/src/filepatterns.rs @ 42841:ce6797ef6eab
rust: apply more formatting fixes
My cargo fmt updated these lines and they look good.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Sat, 31 Aug 2019 14:12:38 +0900 |
parents | 4b3b27d567d5 |
children | 62eabdf91f85 |
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1 // filepatterns.rs |
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2 // |
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3 // Copyright 2019 Raphaël Gomès <rgomes@octobus.net> |
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4 // |
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5 // This software may be used and distributed according to the terms of the |
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6 // GNU General Public License version 2 or any later version. |
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7 |
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8 //! Handling of Mercurial-specific patterns. |
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9 |
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10 use crate::{ |
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11 utils::{files::get_path_from_bytes, SliceExt}, |
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12 LineNumber, PatternError, PatternFileError, |
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13 }; |
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14 use lazy_static::lazy_static; |
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15 use regex::bytes::{NoExpand, Regex}; |
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16 use std::collections::HashMap; |
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17 use std::fs::File; |
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18 use std::io::Read; |
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19 use std::vec::Vec; |
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20 |
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21 lazy_static! { |
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22 static ref RE_ESCAPE: Vec<Vec<u8>> = { |
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23 let mut v: Vec<Vec<u8>> = (0..=255).map(|byte| vec![byte]).collect(); |
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24 let to_escape = b"()[]{}?*+-|^$\\.&~# \t\n\r\x0b\x0c"; |
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25 for byte in to_escape { |
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26 v[*byte as usize].insert(0, b'\\'); |
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27 } |
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28 v |
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29 }; |
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30 } |
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31 |
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32 /// These are matched in order |
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33 const GLOB_REPLACEMENTS: &[(&[u8], &[u8])] = |
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34 &[(b"*/", b"(?:.*/)?"), (b"*", b".*"), (b"", b"[^/]*")]; |
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35 |
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36 #[derive(Debug, Copy, Clone, PartialEq, Eq)] |
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37 pub enum PatternSyntax { |
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38 Regexp, |
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39 /// Glob that matches at the front of the path |
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40 RootGlob, |
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41 /// Glob that matches at any suffix of the path (still anchored at |
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42 /// slashes) |
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43 Glob, |
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44 Path, |
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45 RelPath, |
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46 RelGlob, |
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47 RelRegexp, |
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48 RootFiles, |
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49 } |
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50 |
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51 /// Transforms a glob pattern into a regex |
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52 fn glob_to_re(pat: &[u8]) -> Vec<u8> { |
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53 let mut input = pat; |
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54 let mut res: Vec<u8> = vec![]; |
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55 let mut group_depth = 0; |
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56 |
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57 while let Some((c, rest)) = input.split_first() { |
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58 input = rest; |
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59 |
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60 match c { |
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61 b'*' => { |
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62 for (source, repl) in GLOB_REPLACEMENTS { |
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63 if input.starts_with(source) { |
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64 input = &input[source.len()..]; |
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65 res.extend(*repl); |
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66 break; |
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67 } |
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68 } |
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69 } |
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70 b'?' => res.extend(b"."), |
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71 b'[' => { |
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72 match input.iter().skip(1).position(|b| *b == b']') { |
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73 None => res.extend(b"\\["), |
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74 Some(end) => { |
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75 // Account for the one we skipped |
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76 let end = end + 1; |
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77 |
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78 res.extend(b"["); |
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79 |
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80 for (i, b) in input[..end].iter().enumerate() { |
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81 if *b == b'!' && i == 0 { |
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82 res.extend(b"^") |
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83 } else if *b == b'^' && i == 0 { |
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84 res.extend(b"\\^") |
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85 } else if *b == b'\\' { |
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86 res.extend(b"\\\\") |
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87 } else { |
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88 res.push(*b) |
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89 } |
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90 } |
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91 res.extend(b"]"); |
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92 input = &input[end + 1..]; |
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93 } |
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94 } |
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95 } |
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96 b'{' => { |
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97 group_depth += 1; |
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98 res.extend(b"(?:") |
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99 } |
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100 b'}' if group_depth > 0 => { |
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101 group_depth -= 1; |
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102 res.extend(b")"); |
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103 } |
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104 b',' if group_depth > 0 => res.extend(b"|"), |
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105 b'\\' => { |
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106 let c = { |
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107 if let Some((c, rest)) = input.split_first() { |
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108 input = rest; |
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109 c |
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110 } else { |
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111 c |
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112 } |
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113 }; |
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114 res.extend(&RE_ESCAPE[*c as usize]) |
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115 } |
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116 _ => res.extend(&RE_ESCAPE[*c as usize]), |
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117 } |
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118 } |
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119 res |
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120 } |
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121 |
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122 fn escape_pattern(pattern: &[u8]) -> Vec<u8> { |
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123 pattern |
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124 .iter() |
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125 .flat_map(|c| RE_ESCAPE[*c as usize].clone()) |
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126 .collect() |
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127 } |
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128 |
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129 fn parse_pattern_syntax(kind: &[u8]) -> Result<PatternSyntax, PatternError> { |
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130 match kind { |
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131 b"re" => Ok(PatternSyntax::Regexp), |
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132 b"path" => Ok(PatternSyntax::Path), |
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133 b"relpath" => Ok(PatternSyntax::RelPath), |
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134 b"rootfilesin" => Ok(PatternSyntax::RootFiles), |
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135 b"relglob" => Ok(PatternSyntax::RelGlob), |
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136 b"relre" => Ok(PatternSyntax::RelRegexp), |
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137 b"glob" => Ok(PatternSyntax::Glob), |
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138 b"rootglob" => Ok(PatternSyntax::RootGlob), |
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139 _ => Err(PatternError::UnsupportedSyntax( |
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140 String::from_utf8_lossy(kind).to_string(), |
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141 )), |
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142 } |
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143 } |
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144 |
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145 /// Builds the regex that corresponds to the given pattern. |
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146 /// If within a `syntax: regexp` context, returns the pattern, |
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147 /// otherwise, returns the corresponding regex. |
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148 fn _build_single_regex( |
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149 syntax: PatternSyntax, |
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150 pattern: &[u8], |
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151 globsuffix: &[u8], |
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152 ) -> Vec<u8> { |
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153 if pattern.is_empty() { |
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154 return vec![]; |
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155 } |
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156 match syntax { |
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157 PatternSyntax::Regexp => pattern.to_owned(), |
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158 PatternSyntax::RelRegexp => { |
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159 if pattern[0] == b'^' { |
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160 return pattern.to_owned(); |
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161 } |
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162 let mut res = b".*".to_vec(); |
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163 res.extend(pattern); |
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164 res |
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165 } |
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166 PatternSyntax::Path | PatternSyntax::RelPath => { |
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167 if pattern == b"." { |
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168 return vec![]; |
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169 } |
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170 let mut pattern = escape_pattern(pattern); |
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171 pattern.extend(b"(?:/|$)"); |
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172 pattern |
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173 } |
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174 PatternSyntax::RootFiles => { |
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175 let mut res = if pattern == b"." { |
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176 vec![] |
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177 } else { |
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178 // Pattern is a directory name. |
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179 let mut as_vec: Vec<u8> = escape_pattern(pattern); |
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180 as_vec.push(b'/'); |
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181 as_vec |
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182 }; |
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183 |
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184 // Anything after the pattern must be a non-directory. |
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185 res.extend(b"[^/]+$"); |
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186 res |
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187 } |
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188 PatternSyntax::Glob |
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189 | PatternSyntax::RelGlob |
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190 | PatternSyntax::RootGlob => { |
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191 let mut res: Vec<u8> = vec![]; |
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192 if syntax == PatternSyntax::RelGlob { |
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193 res.extend(b"(?:|.*/)"); |
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194 } |
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195 |
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196 res.extend(glob_to_re(pattern)); |
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197 res.extend(globsuffix.iter()); |
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198 res |
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199 } |
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200 } |
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201 } |
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202 |
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203 const GLOB_SPECIAL_CHARACTERS: [u8; 7] = |
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204 [b'*', b'?', b'[', b']', b'{', b'}', b'\\']; |
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205 |
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206 /// Wrapper function to `_build_single_regex` that short-circuits 'exact' globs |
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207 /// that don't need to be transformed into a regex. |
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208 pub fn build_single_regex( |
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209 kind: &[u8], |
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210 pat: &[u8], |
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211 globsuffix: &[u8], |
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212 ) -> Result<Vec<u8>, PatternError> { |
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213 let enum_kind = parse_pattern_syntax(kind)?; |
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214 if enum_kind == PatternSyntax::RootGlob |
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215 && !pat.iter().any(|b| GLOB_SPECIAL_CHARACTERS.contains(b)) |
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216 { |
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217 let mut escaped = escape_pattern(pat); |
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218 escaped.extend(b"(?:/|$)"); |
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219 Ok(escaped) |
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220 } else { |
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221 Ok(_build_single_regex(enum_kind, pat, globsuffix)) |
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222 } |
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223 } |
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224 |
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225 lazy_static! { |
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226 static ref SYNTAXES: HashMap<&'static [u8], &'static [u8]> = { |
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227 let mut m = HashMap::new(); |
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228 |
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229 m.insert(b"re".as_ref(), b"relre:".as_ref()); |
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230 m.insert(b"regexp".as_ref(), b"relre:".as_ref()); |
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231 m.insert(b"glob".as_ref(), b"relglob:".as_ref()); |
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232 m.insert(b"rootglob".as_ref(), b"rootglob:".as_ref()); |
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233 m.insert(b"include".as_ref(), b"include".as_ref()); |
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234 m.insert(b"subinclude".as_ref(), b"subinclude".as_ref()); |
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235 m |
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236 }; |
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237 } |
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238 |
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239 pub type PatternTuple = (Vec<u8>, LineNumber, Vec<u8>); |
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240 type WarningTuple = (Vec<u8>, Vec<u8>); |
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241 |
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242 pub fn parse_pattern_file_contents( |
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243 lines: &[u8], |
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244 file_path: &[u8], |
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245 warn: bool, |
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246 ) -> (Vec<PatternTuple>, Vec<WarningTuple>) { |
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247 let comment_regex = Regex::new(r"((?:^|[^\\])(?:\\\\)*)#.*").unwrap(); |
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248 let comment_escape_regex = Regex::new(r"\\#").unwrap(); |
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249 let mut inputs: Vec<PatternTuple> = vec![]; |
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250 let mut warnings: Vec<WarningTuple> = vec![]; |
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251 |
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252 let mut current_syntax = b"relre:".as_ref(); |
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253 |
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254 for (line_number, mut line) in lines.split(|c| *c == b'\n').enumerate() { |
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255 let line_number = line_number + 1; |
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256 |
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257 let line_buf; |
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258 if line.contains(&b'#') { |
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259 if let Some(cap) = comment_regex.captures(line) { |
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260 line = &line[..cap.get(1).unwrap().end()] |
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261 } |
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262 line_buf = comment_escape_regex.replace_all(line, NoExpand(b"#")); |
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263 line = &line_buf; |
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264 } |
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265 |
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266 let mut line = line.trim_end(); |
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267 |
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268 if line.is_empty() { |
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269 continue; |
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270 } |
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271 |
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272 if line.starts_with(b"syntax:") { |
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273 let syntax = line[b"syntax:".len()..].trim(); |
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274 |
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275 if let Some(rel_syntax) = SYNTAXES.get(syntax) { |
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276 current_syntax = rel_syntax; |
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277 } else if warn { |
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278 warnings.push((file_path.to_owned(), syntax.to_owned())); |
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279 } |
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280 continue; |
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281 } |
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282 |
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283 let mut line_syntax: &[u8] = ¤t_syntax; |
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284 |
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285 for (s, rels) in SYNTAXES.iter() { |
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286 if line.starts_with(rels) { |
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287 line_syntax = rels; |
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288 line = &line[rels.len()..]; |
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289 break; |
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290 } else if line.starts_with(&[s, b":".as_ref()].concat()) { |
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291 line_syntax = rels; |
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292 line = &line[s.len() + 1..]; |
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293 break; |
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294 } |
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295 } |
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296 |
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297 inputs.push(( |
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298 [line_syntax, line].concat(), |
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299 line_number, |
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300 line.to_owned(), |
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301 )); |
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302 } |
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303 (inputs, warnings) |
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304 } |
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305 |
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306 pub fn read_pattern_file( |
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307 file_path: &[u8], |
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308 warn: bool, |
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309 ) -> Result<(Vec<PatternTuple>, Vec<WarningTuple>), PatternFileError> { |
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310 let mut f = File::open(get_path_from_bytes(file_path))?; |
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311 let mut contents = Vec::new(); |
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312 |
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313 f.read_to_end(&mut contents)?; |
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314 |
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315 Ok(parse_pattern_file_contents(&contents, file_path, warn)) |
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316 } |
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317 |
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318 #[cfg(test)] |
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319 mod tests { |
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320 use super::*; |
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321 |
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322 #[test] |
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323 fn escape_pattern_test() { |
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324 let untouched = br#"!"%',/0123456789:;<=>@ABCDEFGHIJKLMNOPQRSTUVWXYZ_`abcdefghijklmnopqrstuvwxyz"#; |
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325 assert_eq!(escape_pattern(untouched), untouched.to_vec()); |
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326 // All escape codes |
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327 assert_eq!( |
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328 escape_pattern(br#"()[]{}?*+-|^$\\.&~# \t\n\r\v\f"#), |
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329 br#"\(\)\[\]\{\}\?\*\+\-\|\^\$\\\\\.\&\~\#\ \\t\\n\\r\\v\\f"# |
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330 .to_vec() |
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331 ); |
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332 } |
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333 |
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334 #[test] |
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335 fn glob_test() { |
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336 assert_eq!(glob_to_re(br#"?"#), br#"."#); |
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337 assert_eq!(glob_to_re(br#"*"#), br#"[^/]*"#); |
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338 assert_eq!(glob_to_re(br#"**"#), br#".*"#); |
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339 assert_eq!(glob_to_re(br#"**/a"#), br#"(?:.*/)?a"#); |
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340 assert_eq!(glob_to_re(br#"a/**/b"#), br#"a/(?:.*/)?b"#); |
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341 assert_eq!(glob_to_re(br#"[a*?!^][^b][!c]"#), br#"[a*?!^][\^b][^c]"#); |
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342 assert_eq!(glob_to_re(br#"{a,b}"#), br#"(?:a|b)"#); |
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343 assert_eq!(glob_to_re(br#".\*\?"#), br#"\.\*\?"#); |
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344 } |
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345 |
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346 #[test] |
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347 fn test_parse_pattern_file_contents() { |
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348 let lines = b"syntax: glob\n*.elc"; |
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349 |
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350 assert_eq!( |
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351 vec![(b"relglob:*.elc".to_vec(), 2, b"*.elc".to_vec())], |
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352 parse_pattern_file_contents(lines, b"file_path", false).0, |
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353 ); |
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354 |
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355 let lines = b"syntax: include\nsyntax: glob"; |
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356 |
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357 assert_eq!( |
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358 parse_pattern_file_contents(lines, b"file_path", false).0, |
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359 vec![] |
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360 ); |
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361 let lines = b"glob:**.o"; |
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362 assert_eq!( |
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363 parse_pattern_file_contents(lines, b"file_path", false).0, |
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364 vec![(b"relglob:**.o".to_vec(), 1, b"**.o".to_vec())] |
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365 ); |
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366 } |
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367 |
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368 #[test] |
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369 fn test_build_single_regex_shortcut() { |
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370 assert_eq!( |
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371 br"(?:/|$)".to_vec(), |
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372 build_single_regex(b"rootglob", b"", b"").unwrap() |
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373 ); |
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374 assert_eq!( |
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375 br"whatever(?:/|$)".to_vec(), |
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376 build_single_regex(b"rootglob", b"whatever", b"").unwrap() |
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377 ); |
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378 assert_eq!( |
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379 br"[^/]*\.o".to_vec(), |
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380 build_single_regex(b"rootglob", b"*.o", b"").unwrap() |
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381 ); |
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382 } |
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383 } |