diff options
Diffstat (limited to 'vendor/clap_builder/src/derive.rs')
| -rw-r--r-- | vendor/clap_builder/src/derive.rs | 361 |
1 files changed, 0 insertions, 361 deletions
diff --git a/vendor/clap_builder/src/derive.rs b/vendor/clap_builder/src/derive.rs deleted file mode 100644 index 7494e84..0000000 --- a/vendor/clap_builder/src/derive.rs +++ /dev/null @@ -1,361 +0,0 @@ -//! This module contains traits that are usable with the `#[derive(...)]` -//! macros in `clap_derive`. - -use crate::builder::PossibleValue; -use crate::{ArgMatches, Command, Error}; - -use std::ffi::OsString; - -/// Parse command-line arguments into `Self`. -/// -/// The primary one-stop-shop trait used to create an instance of a `clap` -/// [`Command`], conduct the parsing, and turn the resulting [`ArgMatches`] back -/// into concrete instance of the user struct. -/// -/// This trait is primarily a convenience on top of [`FromArgMatches`] + -/// [`CommandFactory`] which uses those two underlying traits to build the two -/// fundamental functions `parse` which uses the `std::env::args_os` iterator, -/// and `parse_from` which allows the consumer to supply the iterator (along -/// with fallible options for each). -/// -/// See also [`Subcommand`] and [`Args`]. -/// -/// **NOTE:** Deriving requires the `derive` feature flag -pub trait Parser: FromArgMatches + CommandFactory + Sized { - /// Parse from `std::env::args_os()`, exit on error - fn parse() -> Self { - let mut matches = <Self as CommandFactory>::command().get_matches(); - let res = <Self as FromArgMatches>::from_arg_matches_mut(&mut matches) - .map_err(format_error::<Self>); - match res { - Ok(s) => s, - Err(e) => { - // Since this is more of a development-time error, we aren't doing as fancy of a quit - // as `get_matches` - e.exit() - } - } - } - - /// Parse from `std::env::args_os()`, return Err on error. - fn try_parse() -> Result<Self, Error> { - let mut matches = ok!(<Self as CommandFactory>::command().try_get_matches()); - <Self as FromArgMatches>::from_arg_matches_mut(&mut matches).map_err(format_error::<Self>) - } - - /// Parse from iterator, exit on error - fn parse_from<I, T>(itr: I) -> Self - where - I: IntoIterator<Item = T>, - T: Into<OsString> + Clone, - { - let mut matches = <Self as CommandFactory>::command().get_matches_from(itr); - let res = <Self as FromArgMatches>::from_arg_matches_mut(&mut matches) - .map_err(format_error::<Self>); - match res { - Ok(s) => s, - Err(e) => { - // Since this is more of a development-time error, we aren't doing as fancy of a quit - // as `get_matches_from` - e.exit() - } - } - } - - /// Parse from iterator, return Err on error. - fn try_parse_from<I, T>(itr: I) -> Result<Self, Error> - where - I: IntoIterator<Item = T>, - T: Into<OsString> + Clone, - { - let mut matches = ok!(<Self as CommandFactory>::command().try_get_matches_from(itr)); - <Self as FromArgMatches>::from_arg_matches_mut(&mut matches).map_err(format_error::<Self>) - } - - /// Update from iterator, exit on error - fn update_from<I, T>(&mut self, itr: I) - where - I: IntoIterator<Item = T>, - T: Into<OsString> + Clone, - { - let mut matches = <Self as CommandFactory>::command_for_update().get_matches_from(itr); - let res = <Self as FromArgMatches>::update_from_arg_matches_mut(self, &mut matches) - .map_err(format_error::<Self>); - if let Err(e) = res { - // Since this is more of a development-time error, we aren't doing as fancy of a quit - // as `get_matches_from` - e.exit() - } - } - - /// Update from iterator, return Err on error. - fn try_update_from<I, T>(&mut self, itr: I) -> Result<(), Error> - where - I: IntoIterator<Item = T>, - T: Into<OsString> + Clone, - { - let mut matches = - ok!(<Self as CommandFactory>::command_for_update().try_get_matches_from(itr)); - <Self as FromArgMatches>::update_from_arg_matches_mut(self, &mut matches) - .map_err(format_error::<Self>) - } -} - -/// Create a [`Command`] relevant for a user-defined container. -/// -/// Derived as part of [`Parser`]. -pub trait CommandFactory: Sized { - /// Build a [`Command`] that can instantiate `Self`. - /// - /// See [`FromArgMatches::from_arg_matches_mut`] for instantiating `Self`. - fn command() -> Command; - /// Build a [`Command`] that can update `self`. - /// - /// See [`FromArgMatches::update_from_arg_matches_mut`] for updating `self`. - fn command_for_update() -> Command; -} - -/// Converts an instance of [`ArgMatches`] to a user-defined container. -/// -/// Derived as part of [`Parser`], [`Args`], and [`Subcommand`]. -pub trait FromArgMatches: Sized { - /// Instantiate `Self` from [`ArgMatches`], parsing the arguments as needed. - /// - /// Motivation: If our application had two CLI options, `--name - /// <STRING>` and the flag `--debug`, we may create a struct as follows: - /// - /// ```rust - /// # #[cfg(feature = "derive")] { - /// struct Context { - /// name: String, - /// debug: bool - /// } - /// # } - /// ``` - /// - /// We then need to convert the `ArgMatches` that `clap` generated into our struct. - /// `from_arg_matches` serves as the equivalent of: - /// - /// ```rust - /// # #[cfg(feature = "derive")] { - /// # use clap::ArgMatches; - /// # struct Context { - /// # name: String, - /// # debug: bool - /// # } - /// impl From<ArgMatches> for Context { - /// fn from(m: ArgMatches) -> Self { - /// Context { - /// name: m.get_one::<String>("name").unwrap().clone(), - /// debug: m.get_flag("debug"), - /// } - /// } - /// } - /// # } - /// ``` - fn from_arg_matches(matches: &ArgMatches) -> Result<Self, Error>; - - /// Instantiate `Self` from [`ArgMatches`], parsing the arguments as needed. - /// - /// Motivation: If our application had two CLI options, `--name - /// <STRING>` and the flag `--debug`, we may create a struct as follows: - /// - /// ```rust - /// # #[cfg(feature = "derive")] { - /// struct Context { - /// name: String, - /// debug: bool - /// } - /// # } - /// ``` - /// - /// We then need to convert the `ArgMatches` that `clap` generated into our struct. - /// `from_arg_matches_mut` serves as the equivalent of: - /// - /// ```rust - /// # #[cfg(feature = "derive")] { - /// # use clap::ArgMatches; - /// # struct Context { - /// # name: String, - /// # debug: bool - /// # } - /// impl From<ArgMatches> for Context { - /// fn from(m: ArgMatches) -> Self { - /// Context { - /// name: m.get_one::<String>("name").unwrap().to_string(), - /// debug: m.get_flag("debug"), - /// } - /// } - /// } - /// # } - /// ``` - fn from_arg_matches_mut(matches: &mut ArgMatches) -> Result<Self, Error> { - Self::from_arg_matches(matches) - } - - /// Assign values from `ArgMatches` to `self`. - fn update_from_arg_matches(&mut self, matches: &ArgMatches) -> Result<(), Error>; - - /// Assign values from `ArgMatches` to `self`. - fn update_from_arg_matches_mut(&mut self, matches: &mut ArgMatches) -> Result<(), Error> { - self.update_from_arg_matches(matches) - } -} - -/// Parse a set of arguments into a user-defined container. -/// -/// Implementing this trait lets a parent container delegate argument parsing behavior to `Self`. -/// with: -/// - `#[command(flatten)] args: ChildArgs`: Attribute can only be used with struct fields that impl -/// `Args`. -/// - `Variant(ChildArgs)`: No attribute is used with enum variants that impl `Args`. -/// -/// **NOTE:** Deriving requires the `derive` feature flag -pub trait Args: FromArgMatches + Sized { - /// Report the [`ArgGroup::id`][crate::ArgGroup::id] for this set of arguments - fn group_id() -> Option<crate::Id> { - None - } - /// Append to [`Command`] so it can instantiate `Self`. - /// - /// See also [`CommandFactory`]. - fn augment_args(cmd: Command) -> Command; - /// Append to [`Command`] so it can update `self`. - /// - /// This is used to implement `#[command(flatten)]` - /// - /// See also [`CommandFactory`]. - fn augment_args_for_update(cmd: Command) -> Command; -} - -/// Parse a sub-command into a user-defined enum. -/// -/// Implementing this trait lets a parent container delegate subcommand behavior to `Self`. -/// with: -/// - `#[command(subcommand)] field: SubCmd`: Attribute can be used with either struct fields or enum -/// variants that impl `Subcommand`. -/// - `#[command(flatten)] Variant(SubCmd)`: Attribute can only be used with enum variants that impl -/// `Subcommand`. -/// -/// **NOTE:** Deriving requires the `derive` feature flag -pub trait Subcommand: FromArgMatches + Sized { - /// Append to [`Command`] so it can instantiate `Self`. - /// - /// See also [`CommandFactory`]. - fn augment_subcommands(cmd: Command) -> Command; - /// Append to [`Command`] so it can update `self`. - /// - /// This is used to implement `#[command(flatten)]` - /// - /// See also [`CommandFactory`]. - fn augment_subcommands_for_update(cmd: Command) -> Command; - /// Test whether `Self` can parse a specific subcommand - fn has_subcommand(name: &str) -> bool; -} - -/// Parse arguments into enums. -/// -/// When deriving [`Parser`], a field whose type implements `ValueEnum` can have the attribute -/// `#[arg(value_enum)]` which will -/// - Call [`EnumValueParser`][crate::builder::EnumValueParser] -/// - Allowing using the `#[arg(default_value_t)]` attribute without implementing `Display`. -/// -/// **NOTE:** Deriving requires the `derive` feature flag -pub trait ValueEnum: Sized + Clone { - /// All possible argument values, in display order. - fn value_variants<'a>() -> &'a [Self]; - - /// Parse an argument into `Self`. - fn from_str(input: &str, ignore_case: bool) -> Result<Self, String> { - Self::value_variants() - .iter() - .find(|v| { - v.to_possible_value() - .expect("ValueEnum::value_variants contains only values with a corresponding ValueEnum::to_possible_value") - .matches(input, ignore_case) - }) - .cloned() - .ok_or_else(|| format!("invalid variant: {input}")) - } - - /// The canonical argument value. - /// - /// The value is `None` for skipped variants. - fn to_possible_value(&self) -> Option<PossibleValue>; -} - -impl<T: Parser> Parser for Box<T> { - fn parse() -> Self { - Box::new(<T as Parser>::parse()) - } - - fn try_parse() -> Result<Self, Error> { - <T as Parser>::try_parse().map(Box::new) - } - - fn parse_from<I, It>(itr: I) -> Self - where - I: IntoIterator<Item = It>, - It: Into<OsString> + Clone, - { - Box::new(<T as Parser>::parse_from(itr)) - } - - fn try_parse_from<I, It>(itr: I) -> Result<Self, Error> - where - I: IntoIterator<Item = It>, - It: Into<OsString> + Clone, - { - <T as Parser>::try_parse_from(itr).map(Box::new) - } -} - -impl<T: CommandFactory> CommandFactory for Box<T> { - fn command<'help>() -> Command { - <T as CommandFactory>::command() - } - fn command_for_update<'help>() -> Command { - <T as CommandFactory>::command_for_update() - } -} - -impl<T: FromArgMatches> FromArgMatches for Box<T> { - fn from_arg_matches(matches: &ArgMatches) -> Result<Self, Error> { - <T as FromArgMatches>::from_arg_matches(matches).map(Box::new) - } - fn from_arg_matches_mut(matches: &mut ArgMatches) -> Result<Self, Error> { - <T as FromArgMatches>::from_arg_matches_mut(matches).map(Box::new) - } - fn update_from_arg_matches(&mut self, matches: &ArgMatches) -> Result<(), Error> { - <T as FromArgMatches>::update_from_arg_matches(self, matches) - } - fn update_from_arg_matches_mut(&mut self, matches: &mut ArgMatches) -> Result<(), Error> { - <T as FromArgMatches>::update_from_arg_matches_mut(self, matches) - } -} - -impl<T: Args> Args for Box<T> { - fn augment_args(cmd: Command) -> Command { - <T as Args>::augment_args(cmd) - } - fn augment_args_for_update(cmd: Command) -> Command { - <T as Args>::augment_args_for_update(cmd) - } -} - -impl<T: Subcommand> Subcommand for Box<T> { - fn augment_subcommands(cmd: Command) -> Command { - <T as Subcommand>::augment_subcommands(cmd) - } - fn augment_subcommands_for_update(cmd: Command) -> Command { - <T as Subcommand>::augment_subcommands_for_update(cmd) - } - fn has_subcommand(name: &str) -> bool { - <T as Subcommand>::has_subcommand(name) - } -} - -fn format_error<I: CommandFactory>(err: crate::Error) -> crate::Error { - let mut cmd = I::command(); - err.format(&mut cmd) -} |