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annotate rust/hg-core/src/utils/hg_path.rs @ 43250:98d996a138de

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rust-cross-platform: remove `unimplemented!` to get compile-time errors We should get a compile-time error that there is missing functionality for the targeted platform instead of the program breaking at runtime. Differential Revision: https://phab.mercurial-scm.org/D7107
author Rapha?l Gom?s <rgomes@octobus.net>
date Wed, 16 Oct 2019 17:16:23 +0300
parents 3fe40dd6355d
children c27e688fcdc3
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1 // hg_path.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 use std::borrow::Borrow;
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9 use std::ffi::{OsStr, OsString};
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10 use std::ops::Deref;
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11 use std::path::{Path, PathBuf};
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12
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13 #[derive(Debug, Eq, PartialEq)]
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14 pub enum HgPathError {
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15 /// Bytes from the invalid `HgPath`
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16 LeadingSlash(Vec<u8>),
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17 /// Bytes and index of the second slash
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18 ConsecutiveSlashes(Vec<u8>, usize),
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19 /// Bytes and index of the null byte
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20 ContainsNullByte(Vec<u8>, usize),
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21 /// Bytes
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22 DecodeError(Vec<u8>),
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23 }
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24
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25 impl ToString for HgPathError {
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26 fn to_string(&self) -> String {
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27 match self {
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28 HgPathError::LeadingSlash(bytes) => {
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29 format!("Invalid HgPath '{:?}': has a leading slash.", bytes)
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30 }
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31 HgPathError::ConsecutiveSlashes(bytes, pos) => format!(
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32 "Invalid HgPath '{:?}': consecutive slahes at pos {}.",
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33 bytes, pos
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34 ),
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35 HgPathError::ContainsNullByte(bytes, pos) => format!(
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36 "Invalid HgPath '{:?}': contains null byte at pos {}.",
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37 bytes, pos
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38 ),
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39 HgPathError::DecodeError(bytes) => {
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40 format!("Invalid HgPath '{:?}': could not be decoded.", bytes)
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41 }
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42 }
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43 }
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44 }
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45
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46 impl From<HgPathError> for std::io::Error {
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47 fn from(e: HgPathError) -> Self {
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48 std::io::Error::new(std::io::ErrorKind::InvalidData, e.to_string())
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49 }
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50 }
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51
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52 /// This is a repository-relative path (or canonical path):
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53 /// - no null characters
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54 /// - `/` separates directories
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55 /// - no consecutive slashes
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56 /// - no leading slash,
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57 /// - no `.` nor `..` of special meaning
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58 /// - stored in repository and shared across platforms
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59 ///
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60 /// Note: there is no guarantee of any `HgPath` being well-formed at any point
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61 /// in its lifetime for performance reasons and to ease ergonomics. It is
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62 /// however checked using the `check_state` method before any file-system
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63 /// operation.
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64 ///
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65 /// This allows us to be encoding-transparent as much as possible, until really
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66 /// needed; `HgPath` can be transformed into a platform-specific path (`OsStr`
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67 /// or `Path`) whenever more complex operations are needed:
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68 /// On Unix, it's just byte-to-byte conversion. On Windows, it has to be
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69 /// decoded from MBCS to WTF-8. If WindowsUTF8Plan is implemented, the source
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70 /// character encoding will be determined on a per-repository basis.
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71 //
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72 // FIXME: (adapted from a comment in the stdlib)
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73 // `HgPath::new()` current implementation relies on `Slice` being
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74 // layout-compatible with `[u8]`.
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75 // When attribute privacy is implemented, `Slice` should be annotated as
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76 // `#[repr(transparent)]`.
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77 // Anyway, `Slice` representation and layout are considered implementation
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78 // detail, are not documented and must not be relied upon.
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79 #[derive(Eq, Ord, PartialEq, PartialOrd, Debug, Hash)]
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80 pub struct HgPath {
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81 inner: [u8],
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82 }
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83
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84 impl HgPath {
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85 pub fn new<S: AsRef<[u8]> + ?Sized>(s: &S) -> &Self {
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86 unsafe { &*(s.as_ref() as *const [u8] as *const Self) }
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87 }
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88 pub fn is_empty(&self) -> bool {
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89 self.inner.is_empty()
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90 }
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91 pub fn len(&self) -> usize {
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92 self.inner.len()
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93 }
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94 fn to_hg_path_buf(&self) -> HgPathBuf {
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95 HgPathBuf {
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96 inner: self.inner.to_owned(),
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97 }
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98 }
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99 pub fn bytes(&self) -> std::slice::Iter<u8> {
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100 self.inner.iter()
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101 }
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102 pub fn to_ascii_uppercase(&self) -> HgPathBuf {
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103 HgPathBuf::from(self.inner.to_ascii_uppercase())
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104 }
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105 pub fn to_ascii_lowercase(&self) -> HgPathBuf {
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106 HgPathBuf::from(self.inner.to_ascii_lowercase())
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107 }
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108 pub fn as_bytes(&self) -> &[u8] {
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109 &self.inner
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110 }
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111 pub fn contains(&self, other: u8) -> bool {
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112 self.inner.contains(&other)
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113 }
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114 pub fn join<T: ?Sized + AsRef<HgPath>>(&self, other: &T) -> HgPathBuf {
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115 let mut inner = self.inner.to_owned();
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116 if inner.len() != 0 && inner.last() != Some(&b'/') {
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117 inner.push(b'/');
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118 }
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119 inner.extend(other.as_ref().bytes());
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120 HgPathBuf::from_bytes(&inner)
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121 }
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122 /// Checks for errors in the path, short-circuiting at the first one.
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123 /// This generates fine-grained errors useful for debugging.
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124 /// To simply check if the path is valid during tests, use `is_valid`.
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125 pub fn check_state(&self) -> Result<(), HgPathError> {
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126 if self.len() == 0 {
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127 return Ok(());
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128 }
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129 let bytes = self.as_bytes();
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130 let mut previous_byte = None;
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131
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132 if bytes[0] == b'/' {
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133 return Err(HgPathError::LeadingSlash(bytes.to_vec()));
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134 }
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135 for (index, byte) in bytes.iter().enumerate() {
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136 match byte {
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137 0 => {
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138 return Err(HgPathError::ContainsNullByte(
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139 bytes.to_vec(),
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140 index,
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141 ))
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142 }
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143 b'/' => {
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144 if previous_byte.is_some() && previous_byte == Some(b'/') {
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145 return Err(HgPathError::ConsecutiveSlashes(
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146 bytes.to_vec(),
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147 index,
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148 ));
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149 }
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150 }
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151 _ => (),
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152 };
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153 previous_byte = Some(*byte);
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154 }
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155 Ok(())
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156 }
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157
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158 #[cfg(test)]
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159 /// Only usable during tests to force developers to handle invalid states
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160 fn is_valid(&self) -> bool {
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161 self.check_state().is_ok()
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162 }
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163 }
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164
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165 #[derive(Eq, Ord, Clone, PartialEq, PartialOrd, Debug, Hash)]
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166 pub struct HgPathBuf {
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167 inner: Vec<u8>,
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168 }
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169
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170 impl HgPathBuf {
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171 pub fn new() -> Self {
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172 Self { inner: Vec::new() }
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173 }
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174 pub fn push(&mut self, byte: u8) {
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175 self.inner.push(byte);
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176 }
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177 pub fn from_bytes(s: &[u8]) -> HgPathBuf {
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178 HgPath::new(s).to_owned()
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179 }
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180 pub fn into_vec(self) -> Vec<u8> {
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181 self.inner
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182 }
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183 pub fn as_ref(&self) -> &[u8] {
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184 self.inner.as_ref()
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185 }
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186 }
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187
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188 impl Deref for HgPathBuf {
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189 type Target = HgPath;
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190
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191 #[inline]
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192 fn deref(&self) -> &HgPath {
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193 &HgPath::new(&self.inner)
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194 }
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195 }
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196
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197 impl From<Vec<u8>> for HgPathBuf {
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198 fn from(vec: Vec<u8>) -> Self {
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199 Self { inner: vec }
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200 }
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201 }
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202
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203 impl<T: ?Sized + AsRef<HgPath>> From<&T> for HgPathBuf {
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204 fn from(s: &T) -> HgPathBuf {
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205 s.as_ref().to_owned()
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206 }
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207 }
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208
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209 impl Into<Vec<u8>> for HgPathBuf {
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210 fn into(self) -> Vec<u8> {
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211 self.inner
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212 }
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213 }
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214
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215 impl Borrow<HgPath> for HgPathBuf {
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216 fn borrow(&self) -> &HgPath {
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217 &HgPath::new(self.as_bytes())
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218 }
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219 }
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220
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221 impl ToOwned for HgPath {
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222 type Owned = HgPathBuf;
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223
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224 fn to_owned(&self) -> HgPathBuf {
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225 self.to_hg_path_buf()
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226 }
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227 }
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228
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229 impl AsRef<HgPath> for HgPath {
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230 fn as_ref(&self) -> &HgPath {
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231 self
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232 }
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233 }
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234
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235 impl AsRef<HgPath> for HgPathBuf {
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236 fn as_ref(&self) -> &HgPath {
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237 self
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238 }
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239 }
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240
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241 impl Extend<u8> for HgPathBuf {
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242 fn extend<T: IntoIterator<Item = u8>>(&mut self, iter: T) {
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243 self.inner.extend(iter);
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244 }
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245 }
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246
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247 /// TODO: Once https://www.mercurial-scm.org/wiki/WindowsUTF8Plan is
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248 /// implemented, these conversion utils will have to work differently depending
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249 /// on the repository encoding: either `UTF-8` or `MBCS`.
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250
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251 pub fn hg_path_to_os_string<P: AsRef<HgPath>>(
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252 hg_path: P,
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253 ) -> Result<OsString, HgPathError> {
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254 hg_path.as_ref().check_state()?;
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255 let os_str;
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256 #[cfg(unix)]
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257 {
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258 use std::os::unix::ffi::OsStrExt;
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259 os_str = std::ffi::OsStr::from_bytes(&hg_path.as_ref().as_bytes());
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260 }
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261 // TODO Handle other platforms
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262 // TODO: convert from WTF8 to Windows MBCS (ANSI encoding).
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263 Ok(os_str.to_os_string())
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264 }
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265
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266 pub fn hg_path_to_path_buf<P: AsRef<HgPath>>(
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267 hg_path: P,
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268 ) -> Result<PathBuf, HgPathError> {
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269 Ok(Path::new(&hg_path_to_os_string(hg_path)?).to_path_buf())
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270 }
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271
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272 pub fn os_string_to_hg_path_buf<S: AsRef<OsStr>>(
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273 os_string: S,
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274 ) -> Result<HgPathBuf, HgPathError> {
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275 let buf;
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276 #[cfg(unix)]
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277 {
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278 use std::os::unix::ffi::OsStrExt;
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279 buf = HgPathBuf::from_bytes(&os_string.as_ref().as_bytes());
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280 }
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281 // TODO Handle other platforms
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282 // TODO: convert from WTF8 to Windows MBCS (ANSI encoding).
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283
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284 buf.check_state()?;
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285 Ok(buf)
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286 }
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287
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288 pub fn path_to_hg_path_buf<P: AsRef<Path>>(
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289 path: P,
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290 ) -> Result<HgPathBuf, HgPathError> {
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291 let buf;
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292 let os_str = path.as_ref().as_os_str();
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293 #[cfg(unix)]
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294 {
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295 use std::os::unix::ffi::OsStrExt;
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296 buf = HgPathBuf::from_bytes(&os_str.as_bytes());
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297 }
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298 // TODO Handle other platforms
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299 // TODO: convert from WTF8 to Windows MBCS (ANSI encoding).
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300
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301 buf.check_state()?;
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302 Ok(buf)
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303 }
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304
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305 #[cfg(test)]
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306 mod tests {
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307 use super::*;
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308
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309 #[test]
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310 fn test_path_states() {
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311 assert_eq!(
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312 Err(HgPathError::LeadingSlash(b"/".to_vec())),
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313 HgPath::new(b"/").check_state()
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314 );
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315 assert_eq!(
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316 Err(HgPathError::ConsecutiveSlashes(b"a/b//c".to_vec(), 4)),
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317 HgPath::new(b"a/b//c").check_state()
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318 );
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319 assert_eq!(
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320 Err(HgPathError::ContainsNullByte(b"a/b/\0c".to_vec(), 4)),
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321 HgPath::new(b"a/b/\0c").check_state()
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322 );
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323 // TODO test HgPathError::DecodeError for the Windows implementation.
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324 assert_eq!(true, HgPath::new(b"").is_valid());
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325 assert_eq!(true, HgPath::new(b"a/b/c").is_valid());
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326 // Backslashes in paths are not significant, but allowed
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327 assert_eq!(true, HgPath::new(br"a\b/c").is_valid());
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328 // Dots in paths are not significant, but allowed
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329 assert_eq!(true, HgPath::new(b"a/b/../c/").is_valid());
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330 assert_eq!(true, HgPath::new(b"./a/b/../c/").is_valid());
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331 }
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332
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333 #[test]
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334 fn test_iter() {
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335 let path = HgPath::new(b"a");
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336 let mut iter = path.bytes();
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337 assert_eq!(Some(&b'a'), iter.next());
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338 assert_eq!(None, iter.next_back());
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339 assert_eq!(None, iter.next());
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340
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341 let path = HgPath::new(b"a");
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342 let mut iter = path.bytes();
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343 assert_eq!(Some(&b'a'), iter.next_back());
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344 assert_eq!(None, iter.next_back());
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345 assert_eq!(None, iter.next());
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346
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347 let path = HgPath::new(b"abc");
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348 let mut iter = path.bytes();
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349 assert_eq!(Some(&b'a'), iter.next());
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350 assert_eq!(Some(&b'c'), iter.next_back());
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351 assert_eq!(Some(&b'b'), iter.next_back());
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352 assert_eq!(None, iter.next_back());
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353 assert_eq!(None, iter.next());
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354
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355 let path = HgPath::new(b"abc");
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356 let mut iter = path.bytes();
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357 assert_eq!(Some(&b'a'), iter.next());
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358 assert_eq!(Some(&b'b'), iter.next());
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359 assert_eq!(Some(&b'c'), iter.next());
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360 assert_eq!(None, iter.next_back());
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361 assert_eq!(None, iter.next());
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362
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363 let path = HgPath::new(b"abc");
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364 let iter = path.bytes();
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365 let mut vec = Vec::new();
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366 vec.extend(iter);
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367 assert_eq!(vec![b'a', b'b', b'c'], vec);
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368
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369 let path = HgPath::new(b"abc");
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370 let mut iter = path.bytes();
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371 assert_eq!(Some(2), iter.rposition(|c| *c == b'c'));
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372
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373 let path = HgPath::new(b"abc");
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374 let mut iter = path.bytes();
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375 assert_eq!(None, iter.rposition(|c| *c == b'd'));
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376 }
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377
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378 #[test]
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379 fn test_join() {
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380 let path = HgPathBuf::from_bytes(b"a").join(HgPath::new(b"b"));
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381 assert_eq!(b"a/b", path.as_bytes());
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382
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383 let path = HgPathBuf::from_bytes(b"a/").join(HgPath::new(b"b/c"));
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384 assert_eq!(b"a/b/c", path.as_bytes());
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385
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386 // No leading slash if empty before join
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387 let path = HgPathBuf::new().join(HgPath::new(b"b/c"));
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388 assert_eq!(b"b/c", path.as_bytes());
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389
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390 // The leading slash is an invalid representation of an `HgPath`, but
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391 // it can happen. This creates another invalid representation of
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392 // consecutive bytes.
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393 // TODO What should be done in this case? Should we silently remove
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394 // the extra slash? Should we change the signature to a problematic
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395 // `Result<HgPathBuf, HgPathError>`, or should we just keep it so and
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396 // let the error happen upon filesystem interaction?
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397 let path = HgPathBuf::from_bytes(b"a/").join(HgPath::new(b"/b"));
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398 assert_eq!(b"a//b", path.as_bytes());
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399 let path = HgPathBuf::from_bytes(b"a").join(HgPath::new(b"/b"));
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400 assert_eq!(b"a//b", path.as_bytes());
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401 }
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402 }