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annotate rust/hg-core/src/config/values.rs @ 52760:94e2547e6f3d

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rust: move code from utils to utils::strings This moves string-related functions in hg::utils into the recently added hg::utils::strings module.
author Mitchell Kember <mkember@janestreet.com>
date Thu, 16 Jan 2025 13:15:02 -0500
parents e98fd81bb151
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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a687a7f27951 rust: Move config value parsing functions to a new module
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1 //! Parsing functions for various type of configuration values.
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2 //!
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3 //! Returning `None` indicates a syntax error. Using a `Result` would be more
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4 //! correct but would take more boilerplate for converting between error types,
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5 //! compared to using `.ok()` on inner results of various error types to
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6 //! convert them all to options. The `Config::get_parse` method later converts
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7 //! those options to results with `ConfigValueParseError`, which contains
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8 //! details about where the value came from (but omits details of what’s
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9 //! invalid inside the value).
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10
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11 use crate::utils::strings::SliceExt;
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12
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13 pub(super) fn parse_bool(v: &[u8]) -> Option<bool> {
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14 match v.to_ascii_lowercase().as_slice() {
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15 b"1" | b"yes" | b"true" | b"on" | b"always" => Some(true),
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16 b"0" | b"no" | b"false" | b"off" | b"never" => Some(false),
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17 _ => None,
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18 }
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19 }
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20
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21 pub(super) fn parse_byte_size(value: &[u8]) -> Option<u64> {
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22 let value = std::str::from_utf8(value).ok()?.to_ascii_lowercase();
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23 const UNITS: &[(&str, u64)] = &[
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24 ("g", 1 << 30),
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25 ("gb", 1 << 30),
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26 ("m", 1 << 20),
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27 ("mb", 1 << 20),
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28 ("k", 1 << 10),
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29 ("kb", 1 << 10),
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30 ("b", 1 << 0), // Needs to be last
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31 ];
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32 for &(unit, multiplier) in UNITS {
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33 if let Some(value) = value.strip_suffix(unit) {
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34 let float: f64 = value.trim().parse().ok()?;
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35 if float >= 0.0 {
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36 return Some((float * multiplier as f64).round() as u64);
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37 } else {
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38 return None;
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39 }
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40 }
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41 }
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42 value.parse().ok()
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43 }
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44
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45 /// Parse a config value as a list of sub-values.
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46 ///
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47 /// Ported from `parselist` in `mercurial/utils/stringutil.py`
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48
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49 // Note: keep behavior in sync with the Python one.
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50
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51 // Note: this could return `Vec<Cow<[u8]>>` instead and borrow `input` when
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52 // possible (when there’s no backslash-escapes) but this is probably not worth
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53 // the complexity as config is presumably not accessed inside
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54 // preformance-sensitive loops.
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55 pub(super) fn parse_list(input: &[u8]) -> Vec<Vec<u8>> {
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56 // Port of Python’s `value.lstrip(b' ,\n')`
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57 // TODO: is this really what we want?
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58 let input =
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59 input.trim_start_matches(|b| b == b' ' || b == b',' || b == b'\n');
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60 parse_list_without_trim_start(input)
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61 }
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62
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63 fn parse_list_without_trim_start(input: &[u8]) -> Vec<Vec<u8>> {
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64 // Start of port of Python’s `_configlist`
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65 let input = input.trim_end_matches(|b| b == b' ' || b == b',');
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66 if input.is_empty() {
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67 return Vec::new();
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68 }
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69
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70 // Just to make “a string” less confusable with “a list of strings”.
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71 type ByteString = Vec<u8>;
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72
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73 // These correspond to Python’s…
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74 let mut mode = ParserMode::Plain; // `parser`
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75 let mut values = Vec::new(); // `parts[:-1]`
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76 let mut next_value = ByteString::new(); // `parts[-1]`
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77 let mut offset = 0; // `offset`
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78
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79 // Setting `parser` to `None` is instead handled by returning immediately
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80 enum ParserMode {
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81 Plain,
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82 Quoted,
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83 }
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84
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85 loop {
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86 match mode {
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87 ParserMode::Plain => {
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88 // Start of port of Python’s `_parse_plain`
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89 let mut whitespace = false;
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90 while let Some(&byte) = input.get(offset) {
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91 if is_space(byte) || byte == b',' {
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92 whitespace = true;
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93 offset += 1;
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94 } else {
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95 break;
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96 }
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97 }
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98 if let Some(&byte) = input.get(offset) {
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99 if whitespace {
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100 values.push(std::mem::take(&mut next_value))
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101 }
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102 if byte == b'"' && next_value.is_empty() {
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103 mode = ParserMode::Quoted;
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104 } else {
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105 if byte == b'"' && next_value.ends_with(b"\\") {
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106 next_value.pop();
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107 }
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108 next_value.push(byte);
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109 }
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110 offset += 1;
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111 } else {
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112 values.push(next_value);
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113 return values;
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114 }
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115 }
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116 ParserMode::Quoted => {
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117 // Start of port of Python’s `_parse_quote`
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118 if let Some(&byte) = input.get(offset) {
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119 if byte == b'"' {
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120 // The input contains a quoted zero-length value `""`
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121 debug_assert_eq!(next_value, b"");
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122 values.push(std::mem::take(&mut next_value));
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123 offset += 1;
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124 while let Some(&byte) = input.get(offset) {
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125 if is_space(byte) || byte == b',' {
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126 offset += 1;
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127 } else {
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128 break;
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129 }
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130 }
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131 mode = ParserMode::Plain;
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132 continue;
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133 }
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134 }
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135
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136 while let Some(&byte) = input.get(offset) {
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137 if byte == b'"' {
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138 break;
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139 }
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140 if byte == b'\\' && input.get(offset + 1) == Some(&b'"') {
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141 next_value.push(b'"');
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142 offset += 2;
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143 } else {
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144 next_value.push(byte);
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145 offset += 1;
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146 }
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147 }
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148
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149 if offset >= input.len() {
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150 // We didn’t find a closing double-quote,
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151 // so treat the opening one as part of an unquoted value
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152 // instead of delimiting the start of a quoted value.
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153
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154 // `next_value` may have had some backslash-escapes
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155 // unescaped. TODO: shouldn’t we use a slice of `input`
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156 // instead?
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157 let mut real_values =
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158 parse_list_without_trim_start(&next_value);
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159
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160 if let Some(first) = real_values.first_mut() {
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161 first.insert(0, b'"');
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162 // Drop `next_value`
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163 values.extend(real_values)
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164 } else {
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165 next_value.push(b'"');
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166 values.push(next_value);
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167 }
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168 return values;
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169 }
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170
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171 // We’re not at the end of the input, which means the `while`
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172 // loop above ended at at double quote. Skip
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173 // over that.
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174 offset += 1;
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175
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176 while let Some(&byte) = input.get(offset) {
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177 if byte == b' ' || byte == b',' {
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178 offset += 1;
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179 } else {
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180 break;
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181 }
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182 }
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183
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184 if offset >= input.len() {
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185 values.push(next_value);
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186 return values;
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187 }
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188
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189 if offset + 1 == input.len() && input[offset] == b'"' {
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190 next_value.push(b'"');
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191 offset += 1;
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192 } else {
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193 values.push(std::mem::take(&mut next_value));
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194 }
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195
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196 mode = ParserMode::Plain;
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197 }
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198 }
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199 }
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200
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201 // https://docs.python.org/3/library/stdtypes.html?#bytes.isspace
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202 fn is_space(byte: u8) -> bool {
49930
e98fd81bb151 rust-clippy: fix most warnings in `hg-core`
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203 matches!(byte, b' ' | b'\t' | b'\n' | b'\r' | b'\x0b' | b'\x0c')
47950
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204 }
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205 }
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206
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207 #[test]
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208 fn test_parse_list() {
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209 // Make `assert_eq` error messages nicer
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210 fn as_strings(values: &[Vec<u8>]) -> Vec<String> {
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211 values
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212 .iter()
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213 .map(|v| std::str::from_utf8(v.as_ref()).unwrap().to_owned())
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214 .collect()
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215 }
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216 macro_rules! assert_parse_list {
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217 ( $input: expr => [ $( $output: expr ),* ] ) => {
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218 assert_eq!(
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219 as_strings(&parse_list($input)),
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220 as_strings(&[ $( Vec::from(&$output[..]) ),* ]),
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221 );
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222 }
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223 }
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224
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225 // Keep these Rust tests in sync with the Python ones in
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226 // `tests/test-config-parselist.py`
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227 assert_parse_list!(b"" => []);
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228 assert_parse_list!(b"," => []);
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229 assert_parse_list!(b"A" => [b"A"]);
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230 assert_parse_list!(b"B,B" => [b"B", b"B"]);
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231 assert_parse_list!(b", C, ,C," => [b"C", b"C"]);
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232 assert_parse_list!(b"\"" => [b"\""]);
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233 assert_parse_list!(b"\"\"" => [b"", b""]);
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234 assert_parse_list!(b"D,\"" => [b"D", b"\""]);
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235 assert_parse_list!(b"E,\"\"" => [b"E", b"", b""]);
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236 assert_parse_list!(b"\"F,F\"" => [b"F,F"]);
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237 assert_parse_list!(b"\"G,G" => [b"\"G", b"G"]);
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238 assert_parse_list!(b"\"H \\\",\\\"H" => [b"\"H", b",", b"H"]);
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239 assert_parse_list!(b"I,I\"" => [b"I", b"I\""]);
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240 assert_parse_list!(b"J,\"J" => [b"J", b"\"J"]);
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241 assert_parse_list!(b"K K" => [b"K", b"K"]);
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242 assert_parse_list!(b"\"K\" K" => [b"K", b"K"]);
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243 assert_parse_list!(b"L\tL" => [b"L", b"L"]);
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244 assert_parse_list!(b"\"L\"\tL" => [b"L", b"", b"L"]);
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245 assert_parse_list!(b"M\x0bM" => [b"M", b"M"]);
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246 assert_parse_list!(b"\"M\"\x0bM" => [b"M", b"", b"M"]);
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247 assert_parse_list!(b"\"N\" , ,\"" => [b"N\""]);
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248 assert_parse_list!(b"\" ,O, " => [b"\"", b"O"]);
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249 }
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250
46603
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251 #[test]
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252 fn test_parse_byte_size() {
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253 assert_eq!(parse_byte_size(b""), None);
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254 assert_eq!(parse_byte_size(b"b"), None);
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255
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256 assert_eq!(parse_byte_size(b"12"), Some(12));
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257 assert_eq!(parse_byte_size(b"12b"), Some(12));
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258 assert_eq!(parse_byte_size(b"12 b"), Some(12));
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259 assert_eq!(parse_byte_size(b"12.1 b"), Some(12));
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260 assert_eq!(parse_byte_size(b"1.1 K"), Some(1126));
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261 assert_eq!(parse_byte_size(b"1.1 kB"), Some(1126));
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262
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263 assert_eq!(parse_byte_size(b"-12 b"), None);
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264 assert_eq!(parse_byte_size(b"-0.1 b"), None);
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265 assert_eq!(parse_byte_size(b"0.1 b"), Some(0));
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266 assert_eq!(parse_byte_size(b"12.1 b"), Some(12));
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267 }