annotate rust/hg-core/src/filepatterns.rs @ 43826:5ac243a92e37

rust-performance: introduce FastHashMap type alias for HashMap Rust's default hashing is slow, because it is meant for preventing collision attacks. For all of the current Rust code, we don't care about those attacks, because if an person with bad intentions has write access to your repo, you have other issues. I've chosen to use the TwoXHash crate because it was made by a reputable member of the Rust community and has very good benchmarks. For now it does not seem to improve performance by much for the current code, but it's something else to not worry about when benchmarking code: in a previous experiment with copytracing in Rust, it accounted for more than 10% of the time of the entire script. Differential Revision: https://phab.mercurial-scm.org/D7116
author Rapha?l Gom?s <rgomes@octobus.net>
date Mon, 14 Oct 2019 13:57:30 +0200
parents 7a01778bc7b7
children d42eea9a0494
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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::SliceExt, FastHashMap, LineNumber, PatternError, PatternFileError,
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12 };
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13 use lazy_static::lazy_static;
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14 use regex::bytes::{NoExpand, Regex};
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15 use std::fs::File;
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16 use std::io::Read;
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17 use std::path::{Path, PathBuf};
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18 use std::vec::Vec;
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19
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20 lazy_static! {
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21 static ref RE_ESCAPE: Vec<Vec<u8>> = {
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22 let mut v: Vec<Vec<u8>> = (0..=255).map(|byte| vec![byte]).collect();
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23 let to_escape = b"()[]{}?*+-|^$\\.&~# \t\n\r\x0b\x0c";
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24 for byte in to_escape {
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25 v[*byte as usize].insert(0, b'\\');
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26 }
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27 v
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28 };
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29 }
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30
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31 /// These are matched in order
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32 const GLOB_REPLACEMENTS: &[(&[u8], &[u8])] =
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33 &[(b"*/", b"(?:.*/)?"), (b"*", b".*"), (b"", b"[^/]*")];
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34
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35 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
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36 pub enum PatternSyntax {
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37 Regexp,
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38 /// Glob that matches at the front of the path
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39 RootGlob,
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40 /// Glob that matches at any suffix of the path (still anchored at
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41 /// slashes)
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42 Glob,
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43 Path,
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44 RelPath,
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45 RelGlob,
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46 RelRegexp,
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47 RootFiles,
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48 }
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49
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50 /// Transforms a glob pattern into a regex
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51 fn glob_to_re(pat: &[u8]) -> Vec<u8> {
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52 let mut input = pat;
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53 let mut res: Vec<u8> = vec![];
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54 let mut group_depth = 0;
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55
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56 while let Some((c, rest)) = input.split_first() {
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57 input = rest;
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58
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59 match c {
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60 b'*' => {
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61 for (source, repl) in GLOB_REPLACEMENTS {
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62 if let Some(rest) = input.drop_prefix(source) {
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63 input = rest;
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64 res.extend(*repl);
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65 break;
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66 }
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67 }
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68 }
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69 b'?' => res.extend(b"."),
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70 b'[' => {
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71 match input.iter().skip(1).position(|b| *b == b']') {
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72 None => res.extend(b"\\["),
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73 Some(end) => {
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74 // Account for the one we skipped
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75 let end = end + 1;
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76
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77 res.extend(b"[");
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78
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79 for (i, b) in input[..end].iter().enumerate() {
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80 if *b == b'!' && i == 0 {
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81 res.extend(b"^")
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82 } else if *b == b'^' && i == 0 {
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83 res.extend(b"\\^")
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84 } else if *b == b'\\' {
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85 res.extend(b"\\\\")
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86 } else {
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87 res.push(*b)
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88 }
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89 }
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90 res.extend(b"]");
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91 input = &input[end + 1..];
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92 }
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93 }
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94 }
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95 b'{' => {
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96 group_depth += 1;
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97 res.extend(b"(?:")
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98 }
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99 b'}' if group_depth > 0 => {
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100 group_depth -= 1;
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101 res.extend(b")");
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102 }
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103 b',' if group_depth > 0 => res.extend(b"|"),
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104 b'\\' => {
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105 let c = {
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106 if let Some((c, rest)) = input.split_first() {
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107 input = rest;
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108 c
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109 } else {
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110 c
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111 }
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112 };
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113 res.extend(&RE_ESCAPE[*c as usize])
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114 }
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115 _ => res.extend(&RE_ESCAPE[*c as usize]),
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116 }
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117 }
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118 res
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119 }
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120
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121 fn escape_pattern(pattern: &[u8]) -> Vec<u8> {
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122 pattern
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123 .iter()
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124 .flat_map(|c| RE_ESCAPE[*c as usize].clone())
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125 .collect()
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126 }
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127
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128 fn parse_pattern_syntax(kind: &[u8]) -> Result<PatternSyntax, PatternError> {
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129 match kind {
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130 b"re" => Ok(PatternSyntax::Regexp),
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131 b"path" => Ok(PatternSyntax::Path),
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132 b"relpath" => Ok(PatternSyntax::RelPath),
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133 b"rootfilesin" => Ok(PatternSyntax::RootFiles),
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134 b"relglob" => Ok(PatternSyntax::RelGlob),
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135 b"relre" => Ok(PatternSyntax::RelRegexp),
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136 b"glob" => Ok(PatternSyntax::Glob),
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137 b"rootglob" => Ok(PatternSyntax::RootGlob),
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138 _ => Err(PatternError::UnsupportedSyntax(
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139 String::from_utf8_lossy(kind).to_string(),
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140 )),
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141 }
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142 }
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143
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144 /// Builds the regex that corresponds to the given pattern.
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145 /// If within a `syntax: regexp` context, returns the pattern,
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146 /// otherwise, returns the corresponding regex.
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147 fn _build_single_regex(
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148 syntax: PatternSyntax,
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149 pattern: &[u8],
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150 globsuffix: &[u8],
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151 ) -> Vec<u8> {
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152 if pattern.is_empty() {
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153 return vec![];
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154 }
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155 match syntax {
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156 PatternSyntax::Regexp => pattern.to_owned(),
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157 PatternSyntax::RelRegexp => {
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158 if pattern[0] == b'^' {
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159 return pattern.to_owned();
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160 }
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161 [b".*", pattern].concat()
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162 }
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163 PatternSyntax::Path | PatternSyntax::RelPath => {
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164 if pattern == b"." {
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165 return vec![];
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166 }
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167 [escape_pattern(pattern).as_slice(), b"(?:/|$)"].concat()
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168 }
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169 PatternSyntax::RootFiles => {
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170 let mut res = if pattern == b"." {
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171 vec![]
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172 } else {
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173 // Pattern is a directory name.
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174 [escape_pattern(pattern).as_slice(), b"/"].concat()
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175 };
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176
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177 // Anything after the pattern must be a non-directory.
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178 res.extend(b"[^/]+$");
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179 res
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180 }
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181 PatternSyntax::RelGlob => {
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182 let glob_re = glob_to_re(pattern);
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183 if let Some(rest) = glob_re.drop_prefix(b"[^/]*") {
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184 [b".*", rest, globsuffix].concat()
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185 } else {
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186 [b"(?:|.*/)", glob_re.as_slice(), globsuffix].concat()
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187 }
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188 }
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189 PatternSyntax::Glob | PatternSyntax::RootGlob => {
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190 [glob_to_re(pattern).as_slice(), globsuffix].concat()
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191 }
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192 }
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193 }
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194
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195 const GLOB_SPECIAL_CHARACTERS: [u8; 7] =
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196 [b'*', b'?', b'[', b']', b'{', b'}', b'\\'];
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197
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198 /// Wrapper function to `_build_single_regex` that short-circuits 'exact' globs
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199 /// that don't need to be transformed into a regex.
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200 pub fn build_single_regex(
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201 kind: &[u8],
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202 pat: &[u8],
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203 globsuffix: &[u8],
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204 ) -> Result<Vec<u8>, PatternError> {
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205 let enum_kind = parse_pattern_syntax(kind)?;
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206 if enum_kind == PatternSyntax::RootGlob
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207 && !pat.iter().any(|b| GLOB_SPECIAL_CHARACTERS.contains(b))
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208 {
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209 let mut escaped = escape_pattern(pat);
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210 escaped.extend(b"(?:/|$)");
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211 Ok(escaped)
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212 } else {
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213 Ok(_build_single_regex(enum_kind, pat, globsuffix))
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214 }
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215 }
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216
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217 lazy_static! {
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218 static ref SYNTAXES: FastHashMap<&'static [u8], &'static [u8]> = {
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219 let mut m = FastHashMap::default();
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220
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221 m.insert(b"re".as_ref(), b"relre:".as_ref());
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222 m.insert(b"regexp".as_ref(), b"relre:".as_ref());
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223 m.insert(b"glob".as_ref(), b"relglob:".as_ref());
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224 m.insert(b"rootglob".as_ref(), b"rootglob:".as_ref());
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225 m.insert(b"include".as_ref(), b"include".as_ref());
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226 m.insert(b"subinclude".as_ref(), b"subinclude".as_ref());
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227 m
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228 };
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229 }
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230
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231 pub type PatternTuple = (Vec<u8>, LineNumber, Vec<u8>);
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232 type WarningTuple = (PathBuf, Vec<u8>);
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233
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234 pub fn parse_pattern_file_contents<P: AsRef<Path>>(
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235 lines: &[u8],
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236 file_path: P,
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237 warn: bool,
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238 ) -> (Vec<PatternTuple>, Vec<WarningTuple>) {
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239 let comment_regex = Regex::new(r"((?:^|[^\\])(?:\\\\)*)#.*").unwrap();
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240 let comment_escape_regex = Regex::new(r"\\#").unwrap();
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241 let mut inputs: Vec<PatternTuple> = vec![];
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242 let mut warnings: Vec<WarningTuple> = vec![];
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243
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244 let mut current_syntax = b"relre:".as_ref();
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245
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246 for (line_number, mut line) in lines.split(|c| *c == b'\n').enumerate() {
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247 let line_number = line_number + 1;
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248
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249 let line_buf;
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250 if line.contains(&b'#') {
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251 if let Some(cap) = comment_regex.captures(line) {
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252 line = &line[..cap.get(1).unwrap().end()]
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253 }
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254 line_buf = comment_escape_regex.replace_all(line, NoExpand(b"#"));
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255 line = &line_buf;
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256 }
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257
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258 let mut line = line.trim_end();
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259
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260 if line.is_empty() {
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261 continue;
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262 }
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263
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264 if let Some(syntax) = line.drop_prefix(b"syntax:") {
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265 let syntax = syntax.trim();
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266
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267 if let Some(rel_syntax) = SYNTAXES.get(syntax) {
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268 current_syntax = rel_syntax;
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269 } else if warn {
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270 warnings
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271 .push((file_path.as_ref().to_owned(), syntax.to_owned()));
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272 }
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273 continue;
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274 }
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275
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276 let mut line_syntax: &[u8] = &current_syntax;
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277
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278 for (s, rels) in SYNTAXES.iter() {
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279 if let Some(rest) = line.drop_prefix(rels) {
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280 line_syntax = rels;
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281 line = rest;
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282 break;
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283 }
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284 if let Some(rest) = line.drop_prefix(&[s, &b":"[..]].concat()) {
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285 line_syntax = rels;
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286 line = rest;
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287 break;
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288 }
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289 }
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290
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291 inputs.push((
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292 [line_syntax, line].concat(),
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293 line_number,
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294 line.to_owned(),
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295 ));
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296 }
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297 (inputs, warnings)
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298 }
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299
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300 pub fn read_pattern_file<P: AsRef<Path>>(
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301 file_path: P,
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302 warn: bool,
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303 ) -> Result<(Vec<PatternTuple>, Vec<WarningTuple>), PatternFileError> {
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304 let mut f = File::open(file_path.as_ref())?;
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305 let mut contents = Vec::new();
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306
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307 f.read_to_end(&mut contents)?;
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308
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309 Ok(parse_pattern_file_contents(&contents, file_path, warn))
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310 }
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311
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312 #[cfg(test)]
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313 mod tests {
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314 use super::*;
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315
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316 #[test]
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317 fn escape_pattern_test() {
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318 let untouched = br#"!"%',/0123456789:;<=>@ABCDEFGHIJKLMNOPQRSTUVWXYZ_`abcdefghijklmnopqrstuvwxyz"#;
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319 assert_eq!(escape_pattern(untouched), untouched.to_vec());
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320 // All escape codes
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321 assert_eq!(
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322 escape_pattern(br#"()[]{}?*+-|^$\\.&~# \t\n\r\v\f"#),
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323 br#"\(\)\[\]\{\}\?\*\+\-\|\^\$\\\\\.\&\~\#\ \\t\\n\\r\\v\\f"#
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324 .to_vec()
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325 );
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326 }
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327
e8f3740cc067 rust-filepatterns: add a Rust implementation of pattern-related utils
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328 #[test]
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329 fn glob_test() {
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330 assert_eq!(glob_to_re(br#"?"#), br#"."#);
e8f3740cc067 rust-filepatterns: add a Rust implementation of pattern-related utils
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331 assert_eq!(glob_to_re(br#"*"#), br#"[^/]*"#);
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332 assert_eq!(glob_to_re(br#"**"#), br#".*"#);
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333 assert_eq!(glob_to_re(br#"**/a"#), br#"(?:.*/)?a"#);
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334 assert_eq!(glob_to_re(br#"a/**/b"#), br#"a/(?:.*/)?b"#);
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335 assert_eq!(glob_to_re(br#"[a*?!^][^b][!c]"#), br#"[a*?!^][\^b][^c]"#);
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336 assert_eq!(glob_to_re(br#"{a,b}"#), br#"(?:a|b)"#);
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337 assert_eq!(glob_to_re(br#".\*\?"#), br#"\.\*\?"#);
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338 }
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339
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diff changeset
340 #[test]
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341 fn test_parse_pattern_file_contents() {
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342 let lines = b"syntax: glob\n*.elc";
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343
e8f3740cc067 rust-filepatterns: add a Rust implementation of pattern-related utils
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344 assert_eq!(
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345 vec![(b"relglob:*.elc".to_vec(), 2, b"*.elc".to_vec())],
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346 parse_pattern_file_contents(lines, Path::new("file_path"), false)
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347 .0,
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diff changeset
348 );
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349
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350 let lines = b"syntax: include\nsyntax: glob";
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351
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diff changeset
352 assert_eq!(
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353 parse_pattern_file_contents(lines, Path::new("file_path"), false)
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354 .0,
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diff changeset
355 vec![]
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diff changeset
356 );
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357 let lines = b"glob:**.o";
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358 assert_eq!(
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359 parse_pattern_file_contents(lines, Path::new("file_path"), false)
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360 .0,
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361 vec![(b"relglob:**.o".to_vec(), 1, b"**.o".to_vec())]
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362 );
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363 }
42438
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364
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365 #[test]
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366 fn test_build_single_regex_shortcut() {
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367 assert_eq!(
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368 br"(?:/|$)".to_vec(),
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369 build_single_regex(b"rootglob", b"", b"").unwrap()
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370 );
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371 assert_eq!(
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372 br"whatever(?:/|$)".to_vec(),
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373 build_single_regex(b"rootglob", b"whatever", b"").unwrap()
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374 );
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375 assert_eq!(
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376 br"[^/]*\.o".to_vec(),
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377 build_single_regex(b"rootglob", b"*.o", b"").unwrap()
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378 );
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379 }
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380 }