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authorValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
committerValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
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tree15afc392522a9e85dc3332235e311b7d39352ea9 /vendor/clap/src/_tutorial/chapter_3.rs
parent3d48cd3f81164bbfc1a755dc1d4a9a02f98c8ddd (diff)
downloadfparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.tar.xz
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-//! ## Validation
-//!
-//! 1. [Enumerated values](#enumerated-values)
-//! 2. [Validated values](#validated-values)
-//! 3. [Argument Relations](#argument-relations)
-//! 4. [Custom Validation](#custom-validation)
-//!
-//! An appropriate default parser/validator will be selected for the field's type. See
-//! [`value_parser!`][crate::value_parser!] for more details.
-//!
-//! ### Enumerated values
-//!
-//! If you have arguments of specific values you want to test for, you can use the
-//! [`PossibleValuesParser`][crate::builder::PossibleValuesParser] or [`Arg::value_parser(["val1",
-//! ...])`][crate::Arg::value_parser] for short.
-//!
-//! This allows you specify the valid values for that argument. If the user does not use one of
-//! those specific values, they will receive a graceful exit with error message informing them
-//! of the mistake, and what the possible valid values are
-//!
-//! ```rust
-#![doc = include_str!("../../examples/tutorial_builder/04_01_possible.rs")]
-//! ```
-#![doc = include_str!("../../examples/tutorial_builder/04_01_possible.md")]
-//!
-//! When enabling the [`derive` feature][crate::_features], you can use
-//! [`ValueEnum`][crate::ValueEnum] to take care of the boiler plate for you, giving the same
-//! results.
-//!
-//! ```rust
-#![doc = include_str!("../../examples/tutorial_builder/04_01_enum.rs")]
-//! ```
-#![doc = include_str!("../../examples/tutorial_builder/04_01_enum.md")]
-//!
-//! ### Validated values
-//!
-//! More generally, you can validate and parse into any data type with [`Arg::value_parser`].
-//!
-//! ```rust
-#![doc = include_str!("../../examples/tutorial_builder/04_02_parse.rs")]
-//! ```
-#![doc = include_str!("../../examples/tutorial_builder/04_02_parse.md")]
-//!
-//! A [custom parser][TypedValueParser] can be used to improve the error messages or provide additional validation:
-//!
-//! ```rust
-#![doc = include_str!("../../examples/tutorial_builder/04_02_validate.rs")]
-//! ```
-#![doc = include_str!("../../examples/tutorial_builder/04_02_validate.md")]
-//!
-//! See [`Arg::value_parser`][crate::Arg::value_parser] for more details.
-//!
-//! ### Argument Relations
-//!
-//! You can declare dependencies or conflicts between [`Arg`][crate::Arg]s or even
-//! [`ArgGroup`][crate::ArgGroup]s.
-//!
-//! [`ArgGroup`][crate::ArgGroup]s make it easier to declare relations instead of having to list
-//! each individually, or when you want a rule to apply "any but not all" arguments.
-//!
-//! Perhaps the most common use of [`ArgGroup`][crate::ArgGroup]s is to require one and *only* one
-//! argument to be present out of a given set. Imagine that you had multiple arguments, and you
-//! want one of them to be required, but making all of them required isn't feasible because perhaps
-//! they conflict with each other.
-//!
-//! ```rust
-#![doc = include_str!("../../examples/tutorial_builder/04_03_relations.rs")]
-//! ```
-#![doc = include_str!("../../examples/tutorial_builder/04_03_relations.md")]
-//!
-//! ### Custom Validation
-//!
-//! As a last resort, you can create custom errors with the basics of clap's formatting.
-//!
-//! ```rust
-#![doc = include_str!("../../examples/tutorial_builder/04_04_custom.rs")]
-//! ```
-#![doc = include_str!("../../examples/tutorial_builder/04_04_custom.md")]
-#![allow(unused_imports)]
-use crate::builder::*;
-
-pub use super::chapter_2 as previous;
-pub use super::chapter_4 as next;
-pub use crate::_tutorial as table_of_contents;