gix_config/file/access/read_only.rs
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453
use std::borrow::Cow;
use bstr::{BStr, ByteSlice};
use gix_features::threading::OwnShared;
use smallvec::SmallVec;
use crate::{
file::{
self,
write::{extract_newline, platform_newline},
Metadata, SectionId,
},
lookup,
parse::Event,
AsKey, File,
};
/// Read-only low-level access methods, as it requires generics for converting into
/// custom values defined in this crate like [`Integer`](crate::Integer) and
/// [`Color`](crate::Color).
impl<'event> File<'event> {
/// Returns an interpreted value given a `key`.
///
/// It's recommended to use one of the value types provide dby this crate
/// as they implement the conversion, but this function is flexible and
/// will accept any type that implements [`TryFrom<&BStr>`](TryFrom).
///
/// Consider [`Self::values`] if you want to get all values of a multivar instead.
///
/// If a `string` is desired, use the [`string()`](Self::string()) method instead.
///
/// # Examples
///
/// ```
/// # use gix_config::File;
/// # use gix_config::{Integer, Boolean};
/// # use std::borrow::Cow;
/// # use std::convert::TryFrom;
/// let config = r#"
/// [core]
/// a = 10k
/// c = false
/// "#;
/// let git_config = gix_config::File::try_from(config)?;
/// // You can either use the turbofish to determine the type...
/// let a_value = git_config.value::<Integer>("core.a")?;
/// // ... or explicitly declare the type to avoid the turbofish
/// let c_value: Boolean = git_config.value("core.c")?;
/// # Ok::<(), Box<dyn std::error::Error>>(())
/// ```
pub fn value<'a, T: TryFrom<Cow<'a, BStr>>>(&'a self, key: impl AsKey) -> Result<T, lookup::Error<T::Error>> {
let key = key.as_key();
self.value_by(key.section_name, key.subsection_name, key.value_name)
}
/// Returns an interpreted value given a section, an optional subsection and
/// value name.
///
/// It's recommended to use one of the value types provide dby this crate
/// as they implement the conversion, but this function is flexible and
/// will accept any type that implements [`TryFrom<&BStr>`](std::convert::TryFrom).
///
/// Consider [`Self::values`] if you want to get all values of a multivar instead.
///
/// If a `string` is desired, use the [`string()`](Self::string()) method instead.
///
/// # Examples
///
/// ```
/// # use gix_config::File;
/// # use gix_config::{Integer, Boolean};
/// # use std::borrow::Cow;
/// # use std::convert::TryFrom;
/// let config = r#"
/// [core]
/// a = 10k
/// c = false
/// "#;
/// let git_config = gix_config::File::try_from(config)?;
/// // You can either use the turbofish to determine the type...
/// let a_value = git_config.value_by::<Integer>("core", None, "a")?;
/// // ... or explicitly declare the type to avoid the turbofish
/// let c_value: Boolean = git_config.value_by("core", None, "c")?;
/// # Ok::<(), Box<dyn std::error::Error>>(())
/// ```
pub fn value_by<'a, T: TryFrom<Cow<'a, BStr>>>(
&'a self,
section_name: &str,
subsection_name: Option<&BStr>,
value_name: &str,
) -> Result<T, lookup::Error<T::Error>> {
T::try_from(self.raw_value_by(section_name, subsection_name, value_name)?)
.map_err(lookup::Error::FailedConversion)
}
/// Like [`value()`](File::value()), but returning an `None` if the value wasn't found at `section[.subsection].value_name`
pub fn try_value<'a, T: TryFrom<Cow<'a, BStr>>>(&'a self, key: impl AsKey) -> Option<Result<T, T::Error>> {
let key = key.as_key();
self.try_value_by(key.section_name, key.subsection_name, key.value_name)
}
/// Like [`value_by()`](File::value_by()), but returning an `None` if the value wasn't found at `section[.subsection].value_name`
pub fn try_value_by<'a, T: TryFrom<Cow<'a, BStr>>>(
&'a self,
section_name: &str,
subsection_name: Option<&BStr>,
value_name: &str,
) -> Option<Result<T, T::Error>> {
self.raw_value_by(section_name, subsection_name, value_name)
.ok()
.map(T::try_from)
}
/// Returns all interpreted values given a section, an optional subsection
/// and value name.
///
/// It's recommended to use one of the value types provide dby this crate
/// as they implement the conversion, but this function is flexible and
/// will accept any type that implements [`TryFrom<&BStr>`](TryFrom).
///
/// Consider [`Self::value`] if you want to get a single value
/// (following last-one-wins resolution) instead.
///
/// To access plain strings, use the [`strings()`](Self::strings()) method instead.
///
/// # Examples
///
/// ```
/// # use gix_config::File;
/// # use gix_config::{Integer, Boolean};
/// # use std::borrow::Cow;
/// # use std::convert::TryFrom;
/// # use bstr::ByteSlice;
/// let config = r#"
/// [core]
/// a = true
/// c
/// [core]
/// a
/// a = false
/// "#;
/// let git_config = gix_config::File::try_from(config).unwrap();
/// // You can either use the turbofish to determine the type...
/// let a_value = git_config.values::<Boolean>("core.a")?;
/// assert_eq!(
/// a_value,
/// vec![
/// Boolean(true),
/// Boolean(false),
/// Boolean(false),
/// ]
/// );
/// // ... or explicitly declare the type to avoid the turbofish
/// let c_value: Vec<Boolean> = git_config.values("core.c").unwrap();
/// assert_eq!(c_value, vec![Boolean(false)]);
/// # Ok::<(), Box<dyn std::error::Error>>(())
/// ```
///
/// [`value`]: crate::value
/// [`TryFrom`]: std::convert::TryFrom
pub fn values<'a, T: TryFrom<Cow<'a, BStr>>>(&'a self, key: impl AsKey) -> Result<Vec<T>, lookup::Error<T::Error>> {
self.raw_values(key)?
.into_iter()
.map(T::try_from)
.collect::<Result<Vec<_>, _>>()
.map_err(lookup::Error::FailedConversion)
}
/// Returns all interpreted values given a section, an optional subsection
/// and value name.
///
/// It's recommended to use one of the value types provide dby this crate
/// as they implement the conversion, but this function is flexible and
/// will accept any type that implements [`TryFrom<&BStr>`](std::convert::TryFrom).
///
/// Consider [`Self::value`] if you want to get a single value
/// (following last-one-wins resolution) instead.
///
/// To access plain strings, use the [`strings()`](Self::strings()) method instead.
///
/// # Examples
///
/// ```
/// # use gix_config::File;
/// # use gix_config::{Integer, Boolean};
/// # use std::borrow::Cow;
/// # use std::convert::TryFrom;
/// # use bstr::ByteSlice;
/// let config = r#"
/// [core]
/// a = true
/// c
/// [core]
/// a
/// a = false
/// "#;
/// let git_config = gix_config::File::try_from(config).unwrap();
/// // You can either use the turbofish to determine the type...
/// let a_value = git_config.values_by::<Boolean>("core", None, "a")?;
/// assert_eq!(
/// a_value,
/// vec![
/// Boolean(true),
/// Boolean(false),
/// Boolean(false),
/// ]
/// );
/// // ... or explicitly declare the type to avoid the turbofish
/// let c_value: Vec<Boolean> = git_config.values_by("core", None, "c").unwrap();
/// assert_eq!(c_value, vec![Boolean(false)]);
/// # Ok::<(), Box<dyn std::error::Error>>(())
/// ```
///
/// [`value`]: crate::value
/// [`TryFrom`]: std::convert::TryFrom
pub fn values_by<'a, T: TryFrom<Cow<'a, BStr>>>(
&'a self,
section_name: &str,
subsection_name: Option<&BStr>,
value_name: &str,
) -> Result<Vec<T>, lookup::Error<T::Error>> {
self.raw_values_by(section_name, subsection_name, value_name)?
.into_iter()
.map(T::try_from)
.collect::<Result<Vec<_>, _>>()
.map_err(lookup::Error::FailedConversion)
}
/// Returns the last found immutable section with a given `name` and optional `subsection_name`.
pub fn section(
&self,
name: &str,
subsection_name: Option<&BStr>,
) -> Result<&file::Section<'event>, lookup::existing::Error> {
self.section_filter(name, subsection_name, |_| true)?
.ok_or(lookup::existing::Error::SectionMissing)
}
/// Returns the last found immutable section with a given `section_key`, identifying the name and subsection name like `core`
/// or `remote.origin`.
pub fn section_by_key(&self, section_key: &BStr) -> Result<&file::Section<'event>, lookup::existing::Error> {
let key =
crate::parse::section::unvalidated::Key::parse(section_key).ok_or(lookup::existing::Error::KeyMissing)?;
self.section(key.section_name, key.subsection_name)
}
/// Returns the last found immutable section with a given `name` and optional `subsection_name`, that matches `filter`.
///
/// If there are sections matching `section_name` and `subsection_name` but the `filter` rejects all of them, `Ok(None)`
/// is returned.
pub fn section_filter<'a>(
&'a self,
name: &str,
subsection_name: Option<&BStr>,
mut filter: impl FnMut(&Metadata) -> bool,
) -> Result<Option<&'a file::Section<'event>>, lookup::existing::Error> {
Ok(self
.section_ids_by_name_and_subname(name.as_ref(), subsection_name)?
.rev()
.find_map({
let sections = &self.sections;
move |id| {
let s = §ions[&id];
filter(s.meta()).then_some(s)
}
}))
}
/// Like [`section_filter()`](File::section_filter()), but identifies the section with `section_key` like `core` or `remote.origin`.
pub fn section_filter_by_key<'a>(
&'a self,
section_key: &BStr,
filter: impl FnMut(&Metadata) -> bool,
) -> Result<Option<&'a file::Section<'event>>, lookup::existing::Error> {
let key =
crate::parse::section::unvalidated::Key::parse(section_key).ok_or(lookup::existing::Error::KeyMissing)?;
self.section_filter(key.section_name, key.subsection_name, filter)
}
/// Gets all sections that match the provided `name`, ignoring any subsections.
///
/// # Examples
///
/// Provided the following config:
///
/// ```text
/// [core]
/// a = b
/// [core ""]
/// c = d
/// [core "apple"]
/// e = f
/// ```
///
/// Calling this method will yield all sections:
///
/// ```
/// # use gix_config::File;
/// # use gix_config::{Integer, Boolean};
/// # use std::borrow::Cow;
/// # use std::convert::TryFrom;
/// let config = r#"
/// [core]
/// a = b
/// [core ""]
/// c = d
/// [core "apple"]
/// e = f
/// "#;
/// let git_config = gix_config::File::try_from(config)?;
/// assert_eq!(git_config.sections_by_name("core").map_or(0, |s|s.count()), 3);
/// # Ok::<(), Box<dyn std::error::Error>>(())
/// ```
#[must_use]
pub fn sections_by_name<'a>(
&'a self,
name: &'a str,
) -> Option<impl Iterator<Item = &'a file::Section<'event>> + 'a> {
self.section_ids_by_name(name).ok().map(move |ids| {
ids.map(move |id| {
self.sections
.get(&id)
.expect("section doesn't have id from from lookup")
})
})
}
/// Similar to [`sections_by_name()`](Self::sections_by_name()), but returns an identifier for this section as well to allow
/// referring to it unambiguously even in the light of deletions.
#[must_use]
pub fn sections_and_ids_by_name<'a>(
&'a self,
name: &'a str,
) -> Option<impl Iterator<Item = (&'a file::Section<'event>, SectionId)> + 'a> {
self.section_ids_by_name(name).ok().map(move |ids| {
ids.map(move |id| {
(
self.sections
.get(&id)
.expect("section doesn't have id from from lookup"),
id,
)
})
})
}
/// Gets all sections that match the provided `name`, ignoring any subsections, and pass the `filter`.
#[must_use]
pub fn sections_by_name_and_filter<'a>(
&'a self,
name: &'a str,
mut filter: impl FnMut(&Metadata) -> bool + 'a,
) -> Option<impl Iterator<Item = &'a file::Section<'event>> + 'a> {
self.section_ids_by_name(name).ok().map(move |ids| {
ids.filter_map(move |id| {
let s = self
.sections
.get(&id)
.expect("section doesn't have id from from lookup");
filter(s.meta()).then_some(s)
})
})
}
/// Returns the number of values in the config, no matter in which section.
///
/// For example, a config with multiple empty sections will return 0.
/// This ignores any comments.
#[must_use]
pub fn num_values(&self) -> usize {
self.sections.values().map(|section| section.num_values()).sum()
}
/// Returns if there are no entries in the config. This will return true
/// if there are only empty sections, with whitespace and comments not being considered
/// void.
#[must_use]
pub fn is_void(&self) -> bool {
self.sections.values().all(|s| s.body.is_void())
}
/// Return this file's metadata, typically set when it was first created to indicate its origins.
///
/// It will be used in all newly created sections to identify them.
/// Change it with [`File::set_meta()`].
pub fn meta(&self) -> &Metadata {
&self.meta
}
/// Change the origin of this instance to be the given `meta`data.
///
/// This is useful to control what origin about-to-be-added sections receive.
pub fn set_meta(&mut self, meta: impl Into<OwnShared<Metadata>>) -> &mut Self {
self.meta = meta.into();
self
}
/// Similar to [`meta()`](File::meta()), but with shared ownership.
pub fn meta_owned(&self) -> OwnShared<Metadata> {
OwnShared::clone(&self.meta)
}
/// Return an iterator over all sections, in order of occurrence in the file itself.
pub fn sections(&self) -> impl Iterator<Item = &file::Section<'event>> + '_ {
self.section_order.iter().map(move |id| &self.sections[id])
}
/// Return an iterator over all sections and their ids, in order of occurrence in the file itself.
pub fn sections_and_ids(&self) -> impl Iterator<Item = (&file::Section<'event>, SectionId)> + '_ {
self.section_order.iter().map(move |id| (&self.sections[id], *id))
}
/// Return an iterator over all sections along with non-section events that are placed right after them,
/// in order of occurrence in the file itself.
///
/// This allows to reproduce the look of sections perfectly when serializing them with
/// [`write_to()`](file::Section::write_to()).
pub fn sections_and_postmatter(&self) -> impl Iterator<Item = (&file::Section<'event>, Vec<&Event<'event>>)> {
self.section_order.iter().map(move |id| {
let s = &self.sections[id];
let pm: Vec<_> = self
.frontmatter_post_section
.get(id)
.map(|events| events.iter().collect())
.unwrap_or_default();
(s, pm)
})
}
/// Return all events which are in front of the first of our sections, or `None` if there are none.
pub fn frontmatter(&self) -> Option<impl Iterator<Item = &Event<'event>>> {
(!self.frontmatter_events.is_empty()).then(|| self.frontmatter_events.iter())
}
/// Return the newline characters that have been detected in this config file or the default ones
/// for the current platform.
///
/// Note that the first found newline is the one we use in the assumption of consistency.
pub fn detect_newline_style(&self) -> &BStr {
self.frontmatter_events
.iter()
.find_map(extract_newline)
.or_else(|| {
self.sections()
.find_map(|s| s.body.as_ref().iter().find_map(extract_newline))
})
.unwrap_or_else(|| platform_newline())
}
pub(crate) fn detect_newline_style_smallvec(&self) -> SmallVec<[u8; 2]> {
self.detect_newline_style().as_bytes().into()
}
}