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annotate rust/hg-core/src/filepatterns.rs @ 42327:e8f3740cc067

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rust-filepatterns: add a Rust implementation of pattern-related utils This change introduces Rust implementations of two functions related to pattern handling, all located in `match.py`: - `_regex` - `readpatternfile` These utils are useful in the long-term effort to improve `hg status`'s performance using Rust. Experimental work done by Valentin Gatien-Baron shows very promising improvements, but is too different from the current Mercurial core code structure to be used "as-is". This is the first - albeit very small - step towards the code revamp needed down the line. Two dependencies were added: `regex` and `lazy_static`. Both of them will be useful for a majority of the Rust code that will be written, are well known and maintained either by the Rust core team, or by very frequent contributors. Differential Revision: https://phab.mercurial-scm.org/D6271
author Rapha?l Gom?s <rgomes@octobus.net>
date Wed, 24 Apr 2019 11:34:09 +0200
parents
children 9609430d3625
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
42327
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1 use crate::{LineNumber, PatternError, PatternFileError};
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2 use regex::Regex;
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3 use std::collections::HashMap;
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4 use std::fs::File;
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5 use std::io::Read;
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6 use std::vec::Vec;
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7
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8 lazy_static! {
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9 static ref reescape: Vec<Vec<u8>> = {
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10 let mut v: Vec<Vec<u8>> = (0..=255).map(|byte| vec![byte]).collect();
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11 let to_escape = b"()[]{}?*+-|^$\\.&~# \t\n\r\x0b\x0c";
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12 for byte in to_escape {
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13 v[*byte as usize].insert(0, b'\\');
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14 }
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15 v
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16 };
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17 }
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18
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19 /// These are matched in order
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20 const GLOB_REPLACEMENTS: &[(&[u8], &[u8])] =
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21 &[(b"*/", b"(?:.*/)?"), (b"*", b".*"), (b"", b"[^/]*")];
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22
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23 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
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24 pub enum PatternSyntax {
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25 Regexp,
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26 /// Glob that matches at the front of the path
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27 RootGlob,
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28 /// Glob that matches at any suffix of the path (still anchored at slashes)
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29 Glob,
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30 Path,
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31 RelPath,
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32 RelGlob,
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33 RelRegexp,
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34 RootFiles,
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35 }
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36
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37 /// Transforms a glob pattern into a regex
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38 fn glob_to_re(pat: &[u8]) -> Vec<u8> {
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39 let mut input = pat;
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40 let mut res: Vec<u8> = vec![];
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41 let mut group_depth = 0;
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42
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43 while let Some((c, rest)) = input.split_first() {
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44 input = rest;
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45
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46 match c {
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47 b'*' => {
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48 for (source, repl) in GLOB_REPLACEMENTS {
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49 if input.starts_with(source) {
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50 input = &input[source.len()..];
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51 res.extend(*repl);
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52 break;
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53 }
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54 }
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55 }
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56 b'?' => res.extend(b"."),
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57 b'[' => {
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58 match input.iter().skip(1).position(|b| *b == b']') {
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59 None => res.extend(b"\\["),
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60 Some(end) => {
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61 // Account for the one we skipped
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62 let end = end + 1;
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63
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64 res.extend(b"[");
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65
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66 for (i, b) in input[..end].iter().enumerate() {
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67 if *b == b'!' && i == 0 {
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68 res.extend(b"^")
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69 } else if *b == b'^' && i == 0 {
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70 res.extend(b"\\^")
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71 } else if *b == b'\\' {
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72 res.extend(b"\\\\")
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73 } else {
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74 res.push(*b)
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75 }
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76 }
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77 res.extend(b"]");
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78 input = &input[end + 1..];
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79 }
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80 }
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81 }
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82 b'{' => {
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83 group_depth += 1;
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84 res.extend(b"(?:")
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85 }
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86 b'}' if group_depth > 0 => {
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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 => res.extend(b"|"),
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91 b'\\' => {
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92 let c = {
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93 if let Some((c, rest)) = input.split_first() {
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94 input = rest;
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95 c
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96 } else {
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97 c
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98 }
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99 };
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100 res.extend(&reescape[*c as usize])
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101 }
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102 _ => res.extend(&reescape[*c as usize]),
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103 }
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104 }
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105 res
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106 }
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107
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108 fn escape_pattern(pattern: &[u8]) -> Vec<u8> {
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109 pattern
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110 .iter()
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111 .flat_map(|c| reescape[*c as usize].clone())
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112 .collect()
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113 }
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114
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115 fn parse_pattern_syntax(kind: &[u8]) -> Result<PatternSyntax, PatternError> {
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116 match kind {
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117 b"re" => Ok(PatternSyntax::Regexp),
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118 b"path" => Ok(PatternSyntax::Path),
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119 b"relpath" => Ok(PatternSyntax::RelPath),
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120 b"rootfilesin" => Ok(PatternSyntax::RootFiles),
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121 b"relglob" => Ok(PatternSyntax::RelGlob),
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122 b"relre" => Ok(PatternSyntax::RelRegexp),
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123 b"glob" => Ok(PatternSyntax::Glob),
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124 b"rootglob" => Ok(PatternSyntax::RootGlob),
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125 _ => Err(PatternError::UnsupportedSyntax(
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126 String::from_utf8_lossy(kind).to_string(),
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127 )),
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128 }
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129 }
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130
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131 /// Builds the regex that corresponds to the given pattern.
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132 /// If within a `syntax: regexp` context, returns the pattern,
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133 /// otherwise, returns the corresponding regex.
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134 fn _build_single_regex(
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135 syntax: PatternSyntax,
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136 pattern: &[u8],
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137 globsuffix: &[u8],
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138 ) -> Vec<u8> {
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139 if pattern.is_empty() {
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140 return vec![];
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141 }
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142 match syntax {
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143 PatternSyntax::Regexp => pattern.to_owned(),
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144 PatternSyntax::RelRegexp => {
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145 if pattern[0] == b'^' {
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146 return pattern.to_owned();
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147 }
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148 let mut res = b".*".to_vec();
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149 res.extend(pattern);
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150 res
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151 }
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152 PatternSyntax::Path | PatternSyntax::RelPath => {
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153 if pattern == b"." {
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154 return vec![];
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155 }
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156 let mut pattern = escape_pattern(pattern);
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157 pattern.extend(b"(?:/|$)");
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158 pattern
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159 }
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160 PatternSyntax::RootFiles => {
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161 let mut res = if pattern == b"." {
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162 vec![]
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163 } else {
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164 // Pattern is a directory name.
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165 let mut as_vec: Vec<u8> = escape_pattern(pattern);
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166 as_vec.push(b'/');
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167 as_vec
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168 };
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169
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170 // Anything after the pattern must be a non-directory.
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171 res.extend(b"[^/]+$");
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172 res
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173 }
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174 PatternSyntax::Glob
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175 | PatternSyntax::RelGlob
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176 | PatternSyntax::RootGlob => {
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177 let mut res: Vec<u8> = vec![];
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178 if syntax == PatternSyntax::RelGlob {
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179 res.extend(b"(?:|.*/)");
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180 }
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181
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182 res.extend(glob_to_re(pattern));
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183 res.extend(globsuffix.iter());
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184 res
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185 }
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186 }
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187 }
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188
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189 const GLOB_SPECIAL_CHARACTERS: [u8; 7] =
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190 [b'*', b'?', b'[', b']', b'{', b'}', b'\\'];
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191
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192 /// Wrapper function to `_build_single_regex` that short-circuits 'exact' globs
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193 /// that don't need to be transformed into a regex.
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194 pub fn build_single_regex(
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195 kind: &str,
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196 pat: &[u8],
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197 globsuffix: &[u8],
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198 ) -> Result<Vec<u8>, PatternError> {
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199 let enum_kind = parse_pattern_syntax(kind.as_bytes())?;
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200 if enum_kind == PatternSyntax::RootGlob
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201 && pat.iter().all(|b| GLOB_SPECIAL_CHARACTERS.contains(b))
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202 {
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203 Ok(pat.to_vec())
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204 } else {
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205 Ok(_build_single_regex(enum_kind, pat, globsuffix))
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206 }
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207 }
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208
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209 lazy_static! {
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210 static ref SYNTAXES: HashMap<&'static str, &'static str> = {
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211 let mut m = HashMap::new();
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212
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213 m.insert("re", "relre:");
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214 m.insert("regexp", "relre:");
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215 m.insert("glob", "relglob:");
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216 m.insert("rootglob", "rootglob:");
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217 m.insert("include", "include");
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218 m.insert("subinclude", "subinclude");
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219 m
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220 };
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221 }
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222
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223 pub type PatternTuple = (String, LineNumber, String);
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224 type WarningTuple = (String, String);
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225
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226 pub fn parse_pattern_file_contents(
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227 lines: &str,
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228 file_path: &str,
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229 warn: bool,
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230 ) -> (Vec<PatternTuple>, Vec<WarningTuple>) {
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231 let comment_regex = Regex::new(r"((?:^|[^\\])(?:\\\\)*)#.*").unwrap();
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232 let mut inputs: Vec<PatternTuple> = vec![];
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233 let mut warnings: Vec<WarningTuple> = vec![];
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234
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235 let mut current_syntax = "relre:";
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236
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237 let mut line = String::new();
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238 for (line_number, line_str) in lines.split('\n').enumerate() {
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239 let line_number = line_number + 1;
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240 line.replace_range(.., line_str);
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241
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242 if line.contains('#') {
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243 if let Some(cap) = comment_regex.captures(line.clone().as_ref()) {
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244 line = line[..cap.get(1).unwrap().end()].to_string()
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245 }
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246 line = line.replace(r"\#", "#");
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247 }
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248
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249 let mut line = line.trim_end();
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250
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251 if line.is_empty() {
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252 continue;
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253 }
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254
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255 if line.starts_with("syntax:") {
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256 let syntax = line["syntax:".len()..].trim();
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257
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258 if let Some(rel_syntax) = SYNTAXES.get(syntax) {
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259 current_syntax = rel_syntax;
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260 } else if warn {
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261 warnings.push((file_path.to_string(), syntax.to_string()));
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262 }
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263 continue;
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264 }
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265
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266 let mut line_syntax: &str = &current_syntax;
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267
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268 for (s, rels) in SYNTAXES.iter() {
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269 if line.starts_with(rels) {
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270 line_syntax = rels;
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271 line = &line[rels.len()..];
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272 break;
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273 } else if line.starts_with(&format!("{}:", s)) {
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274 line_syntax = rels;
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275 line = &line[s.len() + 1..];
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276 break;
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277 }
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278 }
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279
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280 inputs.push((
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281 format!("{}{}", line_syntax, line),
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282 line_number,
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283 line.to_string(),
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284 ));
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285 }
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286 (inputs, warnings)
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287 }
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288
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289 pub fn read_pattern_file(
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290 file_path: String,
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291 warn: bool,
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292 ) -> Result<(Vec<PatternTuple>, Vec<WarningTuple>), PatternFileError> {
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293 let mut f = File::open(&file_path)?;
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294 let mut contents = String::new();
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295
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296 f.read_to_string(&mut contents)?;
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297
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298 Ok(parse_pattern_file_contents(&contents, &file_path, warn))
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299 }
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300
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301 #[cfg(test)]
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302 mod tests {
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303 use super::*;
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304
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305 #[test]
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306 fn escape_pattern_test() {
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307 let untouched = br#"!"%',/0123456789:;<=>@ABCDEFGHIJKLMNOPQRSTUVWXYZ_`abcdefghijklmnopqrstuvwxyz"#;
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308 assert_eq!(escape_pattern(untouched), untouched.to_vec());
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309 // All escape codes
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310 assert_eq!(
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311 escape_pattern(br#"()[]{}?*+-|^$\\.&~# \t\n\r\v\f"#),
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312 br#"\(\)\[\]\{\}\?\*\+\-\|\^\$\\\\\.\&\~\#\ \\t\\n\\r\\v\\f"#
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313 .to_vec()
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314 );
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315 }
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316
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317 #[test]
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318 fn glob_test() {
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319 assert_eq!(glob_to_re(br#"?"#), br#"."#);
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320 assert_eq!(glob_to_re(br#"*"#), br#"[^/]*"#);
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321 assert_eq!(glob_to_re(br#"**"#), br#".*"#);
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322 assert_eq!(glob_to_re(br#"**/a"#), br#"(?:.*/)?a"#);
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323 assert_eq!(glob_to_re(br#"a/**/b"#), br#"a/(?:.*/)?b"#);
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324 assert_eq!(glob_to_re(br#"[a*?!^][^b][!c]"#), br#"[a*?!^][\^b][^c]"#);
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325 assert_eq!(glob_to_re(br#"{a,b}"#), br#"(?:a|b)"#);
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326 assert_eq!(glob_to_re(br#".\*\?"#), br#"\.\*\?"#);
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327 }
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328
e8f3740cc067 rust-filepatterns: add a Rust implementation of pattern-related utils
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329 #[test]
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330 fn test_parse_pattern_file_contents() {
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331 let lines = "syntax: glob\n*.elc";
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332
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diff changeset
333 assert_eq!(
e8f3740cc067 rust-filepatterns: add a Rust implementation of pattern-related utils
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diff changeset
334 vec![("relglob:*.elc".to_string(), 2, "*.elc".to_string())],
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diff changeset
335 parse_pattern_file_contents(lines, "file_path", false).0,
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diff changeset
336 );
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337
e8f3740cc067 rust-filepatterns: add a Rust implementation of pattern-related utils
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338 let lines = "syntax: include\nsyntax: glob";
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339
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340 assert_eq!(
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diff changeset
341 parse_pattern_file_contents(lines, "file_path", false).0,
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diff changeset
342 vec![]
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diff changeset
343 );
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344 }
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345 }