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annotate rust/hg-core/src/filepatterns.rs @ 42609:326fdce22fb2

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rust: switch hg-core and hg-cpython to rust 2018 edition Many interesting changes have happened in Rust since the Oxidation Plan was introduced, like the 2018 edition and procedural macros: - Opting in to the 2018 edition is a clear benefit in terms of future proofing, new (nice to have) syntactical sugar notwithstanding. It also has a new non-lexical, non-AST based borrow checker that has fewer bugs(!) and allows us to write correct code that in some cases would have been rejected by the old one. - Procedural macros allow us to use the PyO3 crate which maintainers have expressed the clear goal of compiling on stable, which would help in code maintainability compared to rust-cpython. In this patch are the following changes: - Removing most `extern crate` uses - Updating `use` clauses (`crate` keyword, nested `use`) - Removing `mod.rs` in favor of an aptly named module file Like discussed in the mailing list ( https://www.mercurial-scm.org/pipermail/mercurial-devel/2019-July/132316.html ), until Rust integration in Mercurial is considered to be out of the experimental phase, the maximum version of Rust allowed is whatever the latest version Debian packages. Differential Revision: https://phab.mercurial-scm.org/D6597
author Rapha?l Gom?s <rgomes@octobus.net>
date Tue, 02 Jul 2019 17:15:03 +0200
parents a4a468b00d44
children 0247601869ba
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
42609
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1 use crate::{
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2 utils::{files::get_path_from_bytes, replace_slice, SliceExt},
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3 LineNumber, PatternError, PatternFileError,
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4 };
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5 use lazy_static::lazy_static;
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9609430d3625 rust-filepatterns: use bytes instead of String
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6 use regex::bytes::Regex;
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7 use std::collections::HashMap;
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8 use std::fs::File;
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9 use std::io::Read;
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10 use std::vec::Vec;
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11
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12 lazy_static! {
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13 static ref RE_ESCAPE: Vec<Vec<u8>> = {
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14 let mut v: Vec<Vec<u8>> = (0..=255).map(|byte| vec![byte]).collect();
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15 let to_escape = b"()[]{}?*+-|^$\\.&~# \t\n\r\x0b\x0c";
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16 for byte in to_escape {
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17 v[*byte as usize].insert(0, b'\\');
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18 }
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19 v
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20 };
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21 }
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22
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23 /// These are matched in order
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24 const GLOB_REPLACEMENTS: &[(&[u8], &[u8])] =
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25 &[(b"*/", b"(?:.*/)?"), (b"*", b".*"), (b"", b"[^/]*")];
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26
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27 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
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28 pub enum PatternSyntax {
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29 Regexp,
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30 /// Glob that matches at the front of the path
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31 RootGlob,
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32 /// Glob that matches at any suffix of the path (still anchored at slashes)
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33 Glob,
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34 Path,
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35 RelPath,
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36 RelGlob,
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37 RelRegexp,
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38 RootFiles,
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39 }
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40
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41 /// Transforms a glob pattern into a regex
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42 fn glob_to_re(pat: &[u8]) -> Vec<u8> {
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43 let mut input = pat;
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44 let mut res: Vec<u8> = vec![];
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45 let mut group_depth = 0;
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46
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47 while let Some((c, rest)) = input.split_first() {
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48 input = rest;
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49
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50 match c {
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51 b'*' => {
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52 for (source, repl) in GLOB_REPLACEMENTS {
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53 if input.starts_with(source) {
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54 input = &input[source.len()..];
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55 res.extend(*repl);
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56 break;
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57 }
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58 }
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59 }
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60 b'?' => res.extend(b"."),
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61 b'[' => {
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62 match input.iter().skip(1).position(|b| *b == b']') {
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63 None => res.extend(b"\\["),
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64 Some(end) => {
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65 // Account for the one we skipped
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66 let end = end + 1;
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67
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68 res.extend(b"[");
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69
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70 for (i, b) in input[..end].iter().enumerate() {
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71 if *b == b'!' && i == 0 {
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72 res.extend(b"^")
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73 } else if *b == b'^' && i == 0 {
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74 res.extend(b"\\^")
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75 } else if *b == b'\\' {
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76 res.extend(b"\\\\")
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77 } else {
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78 res.push(*b)
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79 }
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80 }
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81 res.extend(b"]");
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82 input = &input[end + 1..];
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83 }
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84 }
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85 }
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86 b'{' => {
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87 group_depth += 1;
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88 res.extend(b"(?:")
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89 }
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90 b'}' if group_depth > 0 => {
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91 group_depth -= 1;
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92 res.extend(b")");
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93 }
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94 b',' if group_depth > 0 => res.extend(b"|"),
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95 b'\\' => {
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96 let c = {
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97 if let Some((c, rest)) = input.split_first() {
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98 input = rest;
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99 c
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100 } else {
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101 c
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102 }
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103 };
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104 res.extend(&RE_ESCAPE[*c as usize])
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105 }
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106 _ => res.extend(&RE_ESCAPE[*c as usize]),
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107 }
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108 }
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109 res
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110 }
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111
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112 fn escape_pattern(pattern: &[u8]) -> Vec<u8> {
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113 pattern
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114 .iter()
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115 .flat_map(|c| RE_ESCAPE[*c as usize].clone())
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116 .collect()
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117 }
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118
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119 fn parse_pattern_syntax(kind: &[u8]) -> Result<PatternSyntax, PatternError> {
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120 match kind {
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121 b"re" => Ok(PatternSyntax::Regexp),
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122 b"path" => Ok(PatternSyntax::Path),
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123 b"relpath" => Ok(PatternSyntax::RelPath),
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124 b"rootfilesin" => Ok(PatternSyntax::RootFiles),
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125 b"relglob" => Ok(PatternSyntax::RelGlob),
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126 b"relre" => Ok(PatternSyntax::RelRegexp),
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127 b"glob" => Ok(PatternSyntax::Glob),
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128 b"rootglob" => Ok(PatternSyntax::RootGlob),
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129 _ => Err(PatternError::UnsupportedSyntax(
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130 String::from_utf8_lossy(kind).to_string(),
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131 )),
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132 }
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133 }
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134
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135 /// Builds the regex that corresponds to the given pattern.
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136 /// If within a `syntax: regexp` context, returns the pattern,
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137 /// otherwise, returns the corresponding regex.
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138 fn _build_single_regex(
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139 syntax: PatternSyntax,
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140 pattern: &[u8],
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141 globsuffix: &[u8],
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142 ) -> Vec<u8> {
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143 if pattern.is_empty() {
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144 return vec![];
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145 }
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146 match syntax {
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147 PatternSyntax::Regexp => pattern.to_owned(),
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148 PatternSyntax::RelRegexp => {
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149 if pattern[0] == b'^' {
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150 return pattern.to_owned();
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151 }
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152 let mut res = b".*".to_vec();
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153 res.extend(pattern);
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154 res
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155 }
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156 PatternSyntax::Path | PatternSyntax::RelPath => {
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157 if pattern == b"." {
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158 return vec![];
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159 }
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160 let mut pattern = escape_pattern(pattern);
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161 pattern.extend(b"(?:/|$)");
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162 pattern
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163 }
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164 PatternSyntax::RootFiles => {
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165 let mut res = if pattern == b"." {
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166 vec![]
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167 } else {
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168 // Pattern is a directory name.
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169 let mut as_vec: Vec<u8> = escape_pattern(pattern);
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170 as_vec.push(b'/');
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171 as_vec
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172 };
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173
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174 // Anything after the pattern must be a non-directory.
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175 res.extend(b"[^/]+$");
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176 res
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177 }
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178 PatternSyntax::Glob
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179 | PatternSyntax::RelGlob
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180 | PatternSyntax::RootGlob => {
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181 let mut res: Vec<u8> = vec![];
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182 if syntax == PatternSyntax::RelGlob {
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183 res.extend(b"(?:|.*/)");
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184 }
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185
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186 res.extend(glob_to_re(pattern));
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187 res.extend(globsuffix.iter());
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188 res
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189 }
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190 }
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191 }
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192
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193 const GLOB_SPECIAL_CHARACTERS: [u8; 7] =
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194 [b'*', b'?', b'[', b']', b'{', b'}', b'\\'];
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195
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196 /// Wrapper function to `_build_single_regex` that short-circuits 'exact' globs
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197 /// that don't need to be transformed into a regex.
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198 pub fn build_single_regex(
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199 kind: &[u8],
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200 pat: &[u8],
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201 globsuffix: &[u8],
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202 ) -> Result<Vec<u8>, PatternError> {
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203 let enum_kind = parse_pattern_syntax(kind)?;
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204 if enum_kind == PatternSyntax::RootGlob
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205 && !pat.iter().any(|b| GLOB_SPECIAL_CHARACTERS.contains(b))
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206 {
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207 let mut escaped = escape_pattern(pat);
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208 escaped.extend(b"(?:/|$)");
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209 Ok(escaped)
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210 } else {
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211 Ok(_build_single_regex(enum_kind, pat, globsuffix))
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212 }
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213 }
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214
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215 lazy_static! {
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216 static ref SYNTAXES: HashMap<&'static [u8], &'static [u8]> = {
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217 let mut m = HashMap::new();
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218
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219 m.insert(b"re".as_ref(), b"relre:".as_ref());
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220 m.insert(b"regexp".as_ref(), b"relre:".as_ref());
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221 m.insert(b"glob".as_ref(), b"relglob:".as_ref());
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222 m.insert(b"rootglob".as_ref(), b"rootglob:".as_ref());
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223 m.insert(b"include".as_ref(), b"include".as_ref());
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224 m.insert(b"subinclude".as_ref(), b"subinclude".as_ref());
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225 m
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226 };
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227 }
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228
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229 pub type PatternTuple = (Vec<u8>, LineNumber, Vec<u8>);
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230 type WarningTuple = (String, String);
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231
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232 pub fn parse_pattern_file_contents(
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233 lines: &[u8],
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234 file_path: &[u8],
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235 warn: bool,
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236 ) -> (Vec<PatternTuple>, Vec<WarningTuple>) {
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237 let comment_regex = Regex::new(r"((?:^|[^\\])(?:\\\\)*)#.*").unwrap();
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238 let mut inputs: Vec<PatternTuple> = vec![];
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239 let mut warnings: Vec<WarningTuple> = vec![];
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240
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241 let mut current_syntax = b"relre:".as_ref();
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242
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243 for (line_number, mut line) in lines.split(|c| *c == b'\n').enumerate() {
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244 let line_number = line_number + 1;
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245
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246 if line.contains(&('#' as u8)) {
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247 if let Some(cap) = comment_regex.captures(line) {
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248 line = &line[..cap.get(1).unwrap().end()]
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249 }
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250 let mut line = line.to_owned();
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251 replace_slice(&mut line, br"\#", b"#");
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252 }
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253
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254 let mut line = line.trim_end();
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255
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256 if line.is_empty() {
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257 continue;
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258 }
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259
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260 if line.starts_with(b"syntax:") {
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261 let syntax = line[b"syntax:".len()..].trim();
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262
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263 if let Some(rel_syntax) = SYNTAXES.get(syntax) {
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264 current_syntax = rel_syntax;
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265 } else if warn {
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266 warnings.push((
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267 String::from_utf8_lossy(file_path).to_string(),
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268 String::from_utf8_lossy(syntax).to_string(),
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269 ));
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270 }
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271 continue;
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272 }
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273
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274 let mut line_syntax: &[u8] = &current_syntax;
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275
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276 for (s, rels) in SYNTAXES.iter() {
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277 if line.starts_with(rels) {
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278 line_syntax = rels;
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279 line = &line[rels.len()..];
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280 break;
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281 } else if line.starts_with(&[s, b":".as_ref()].concat()) {
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282 line_syntax = rels;
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283 line = &line[s.len() + 1..];
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284 break;
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285 }
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286 }
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287
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288 inputs.push((
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289 [line_syntax, line].concat(),
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290 line_number,
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291 line.to_owned(),
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292 ));
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293 }
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294 (inputs, warnings)
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295 }
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296
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297 pub fn read_pattern_file(
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298 file_path: &[u8],
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299 warn: bool,
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300 ) -> Result<(Vec<PatternTuple>, Vec<WarningTuple>), PatternFileError> {
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301 let mut f = File::open(get_path_from_bytes(file_path))?;
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302 let mut contents = Vec::new();
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303
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304 f.read_to_end(&mut contents)?;
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305
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306 Ok(parse_pattern_file_contents(&contents, file_path, warn))
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307 }
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308
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309 #[cfg(test)]
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310 mod tests {
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311 use super::*;
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312
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313 #[test]
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314 fn escape_pattern_test() {
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315 let untouched = br#"!"%',/0123456789:;<=>@ABCDEFGHIJKLMNOPQRSTUVWXYZ_`abcdefghijklmnopqrstuvwxyz"#;
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316 assert_eq!(escape_pattern(untouched), untouched.to_vec());
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317 // All escape codes
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318 assert_eq!(
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319 escape_pattern(br#"()[]{}?*+-|^$\\.&~# \t\n\r\v\f"#),
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320 br#"\(\)\[\]\{\}\?\*\+\-\|\^\$\\\\\.\&\~\#\ \\t\\n\\r\\v\\f"#
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321 .to_vec()
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322 );
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323 }
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324
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325 #[test]
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326 fn glob_test() {
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327 assert_eq!(glob_to_re(br#"?"#), br#"."#);
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328 assert_eq!(glob_to_re(br#"*"#), br#"[^/]*"#);
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329 assert_eq!(glob_to_re(br#"**"#), br#".*"#);
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330 assert_eq!(glob_to_re(br#"**/a"#), br#"(?:.*/)?a"#);
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331 assert_eq!(glob_to_re(br#"a/**/b"#), br#"a/(?:.*/)?b"#);
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332 assert_eq!(glob_to_re(br#"[a*?!^][^b][!c]"#), br#"[a*?!^][\^b][^c]"#);
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333 assert_eq!(glob_to_re(br#"{a,b}"#), br#"(?:a|b)"#);
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334 assert_eq!(glob_to_re(br#".\*\?"#), br#"\.\*\?"#);
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335 }
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336
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337 #[test]
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338 fn test_parse_pattern_file_contents() {
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339 let lines = b"syntax: glob\n*.elc";
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340
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341 assert_eq!(
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342 vec![(b"relglob:*.elc".to_vec(), 2, b"*.elc".to_vec())],
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343 parse_pattern_file_contents(lines, b"file_path", false).0,
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344 );
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345
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346 let lines = b"syntax: include\nsyntax: glob";
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347
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348 assert_eq!(
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349 parse_pattern_file_contents(lines, b"file_path", false).0,
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350 vec![]
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351 );
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352 let lines = b"glob:**.o";
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353 assert_eq!(
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354 parse_pattern_file_contents(lines, b"file_path", false).0,
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355 vec![(b"relglob:**.o".to_vec(), 1, b"**.o".to_vec())]
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356 );
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357 }
42438
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358
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359 #[test]
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360 fn test_build_single_regex_shortcut() {
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361 assert_eq!(
48f1f864d928 rust-regex: fix shortcut for exact matches
Rapha?l Gom?s <rgomes@octobus.net>
parents: 42437
diff changeset
362 br"(?:/|$)".to_vec(),
48f1f864d928 rust-regex: fix shortcut for exact matches
Rapha?l Gom?s <rgomes@octobus.net>
parents: 42437
diff changeset
363 build_single_regex(b"rootglob", b"", b"").unwrap()
48f1f864d928 rust-regex: fix shortcut for exact matches
Rapha?l Gom?s <rgomes@octobus.net>
parents: 42437
diff changeset
364 );
48f1f864d928 rust-regex: fix shortcut for exact matches
Rapha?l Gom?s <rgomes@octobus.net>
parents: 42437
diff changeset
365 assert_eq!(
48f1f864d928 rust-regex: fix shortcut for exact matches
Rapha?l Gom?s <rgomes@octobus.net>
parents: 42437
diff changeset
366 br"whatever(?:/|$)".to_vec(),
48f1f864d928 rust-regex: fix shortcut for exact matches
Rapha?l Gom?s <rgomes@octobus.net>
parents: 42437
diff changeset
367 build_single_regex(b"rootglob", b"whatever", b"").unwrap()
48f1f864d928 rust-regex: fix shortcut for exact matches
Rapha?l Gom?s <rgomes@octobus.net>
parents: 42437
diff changeset
368 );
48f1f864d928 rust-regex: fix shortcut for exact matches
Rapha?l Gom?s <rgomes@octobus.net>
parents: 42437
diff changeset
369 assert_eq!(
48f1f864d928 rust-regex: fix shortcut for exact matches
Rapha?l Gom?s <rgomes@octobus.net>
parents: 42437
diff changeset
370 br"[^/]*\.o".to_vec(),
48f1f864d928 rust-regex: fix shortcut for exact matches
Rapha?l Gom?s <rgomes@octobus.net>
parents: 42437
diff changeset
371 build_single_regex(b"rootglob", b"*.o", b"").unwrap()
48f1f864d928 rust-regex: fix shortcut for exact matches
Rapha?l Gom?s <rgomes@octobus.net>
parents: 42437
diff changeset
372 );
48f1f864d928 rust-regex: fix shortcut for exact matches
Rapha?l Gom?s <rgomes@octobus.net>
parents: 42437
diff changeset
373 }
42327
e8f3740cc067 rust-filepatterns: add a Rust implementation of pattern-related utils
Rapha?l Gom?s <rgomes@octobus.net>
parents:
diff changeset
374 }