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annotate rust/hg-core/src/filepatterns.rs @ 42869:62eabdf91f85

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rustfilepatterns: refactor the pattern of removing a prefix from a &[u8] Differential Revision: https://phab.mercurial-scm.org/D6766
author Valentin Gatien-Baron <valentin.gatienbaron@gmail.com>
date Mon, 26 Aug 2019 08:25:01 -0400
parents ce6797ef6eab
children 72890d8f9860
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 let Some(rest) = input.drop_prefix(source) {
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64 input = rest;
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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 let Some(syntax) = line.drop_prefix(b"syntax:") {
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273 let syntax = syntax.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] = &current_syntax;
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284
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285 for (s, rels) in SYNTAXES.iter() {
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286 if let Some(rest) = line.drop_prefix(rels) {
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287 line_syntax = rels;
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288 line = rest;
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289 break;
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290 }
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291 if let Some(rest) = line.drop_prefix(&[s, &b":"[..]].concat()) {
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292 line_syntax = rels;
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293 line = rest;
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294 break;
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295 }
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296 }
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297
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298 inputs.push((
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299 [line_syntax, line].concat(),
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300 line_number,
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301 line.to_owned(),
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302 ));
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303 }
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304 (inputs, warnings)
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305 }
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306
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307 pub fn read_pattern_file(
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308 file_path: &[u8],
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309 warn: bool,
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310 ) -> Result<(Vec<PatternTuple>, Vec<WarningTuple>), PatternFileError> {
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311 let mut f = File::open(get_path_from_bytes(file_path))?;
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312 let mut contents = Vec::new();
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313
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314 f.read_to_end(&mut contents)?;
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315
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316 Ok(parse_pattern_file_contents(&contents, file_path, warn))
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317 }
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318
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319 #[cfg(test)]
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320 mod tests {
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321 use super::*;
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322
e8f3740cc067 rust-filepatterns: add a Rust implementation of pattern-related utils
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323 #[test]
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324 fn escape_pattern_test() {
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325 let untouched = br#"!"%',/0123456789:;<=>@ABCDEFGHIJKLMNOPQRSTUVWXYZ_`abcdefghijklmnopqrstuvwxyz"#;
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326 assert_eq!(escape_pattern(untouched), untouched.to_vec());
e8f3740cc067 rust-filepatterns: add a Rust implementation of pattern-related utils
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327 // All escape codes
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328 assert_eq!(
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329 escape_pattern(br#"()[]{}?*+-|^$\\.&~# \t\n\r\v\f"#),
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330 br#"\(\)\[\]\{\}\?\*\+\-\|\^\$\\\\\.\&\~\#\ \\t\\n\\r\\v\\f"#
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331 .to_vec()
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332 );
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diff changeset
333 }
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334
e8f3740cc067 rust-filepatterns: add a Rust implementation of pattern-related utils
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diff changeset
335 #[test]
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336 fn glob_test() {
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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#"**"#), br#".*"#);
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340 assert_eq!(glob_to_re(br#"**/a"#), br#"(?:.*/)?a"#);
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341 assert_eq!(glob_to_re(br#"a/**/b"#), br#"a/(?:.*/)?b"#);
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342 assert_eq!(glob_to_re(br#"[a*?!^][^b][!c]"#), br#"[a*?!^][\^b][^c]"#);
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343 assert_eq!(glob_to_re(br#"{a,b}"#), br#"(?:a|b)"#);
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344 assert_eq!(glob_to_re(br#".\*\?"#), br#"\.\*\?"#);
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345 }
e8f3740cc067 rust-filepatterns: add a Rust implementation of pattern-related utils
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346
e8f3740cc067 rust-filepatterns: add a Rust implementation of pattern-related utils
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diff changeset
347 #[test]
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348 fn test_parse_pattern_file_contents() {
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349 let lines = b"syntax: glob\n*.elc";
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350
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351 assert_eq!(
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352 vec![(b"relglob:*.elc".to_vec(), 2, b"*.elc".to_vec())],
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353 parse_pattern_file_contents(lines, b"file_path", false).0,
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diff changeset
354 );
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355
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356 let lines = b"syntax: include\nsyntax: glob";
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357
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358 assert_eq!(
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359 parse_pattern_file_contents(lines, b"file_path", false).0,
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diff changeset
360 vec![]
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diff changeset
361 );
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362 let lines = b"glob:**.o";
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diff changeset
363 assert_eq!(
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364 parse_pattern_file_contents(lines, b"file_path", false).0,
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365 vec![(b"relglob:**.o".to_vec(), 1, b"**.o".to_vec())]
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366 );
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367 }
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368
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369 #[test]
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370 fn test_build_single_regex_shortcut() {
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371 assert_eq!(
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372 br"(?:/|$)".to_vec(),
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373 build_single_regex(b"rootglob", b"", b"").unwrap()
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374 );
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375 assert_eq!(
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376 br"whatever(?:/|$)".to_vec(),
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377 build_single_regex(b"rootglob", b"whatever", b"").unwrap()
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378 );
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379 assert_eq!(
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380 br"[^/]*\.o".to_vec(),
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381 build_single_regex(b"rootglob", b"*.o", b"").unwrap()
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382 );
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383 }
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384 }