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

// BEGIN - Embark standard lints v0.3
// do not change or add/remove here, but one can add exceptions after this section
// for more info see: <https://github.com/EmbarkStudios/rust-ecosystem/issues/59>
#![deny(unsafe_code)]
#![warn(
    clippy::all,
    clippy::await_holding_lock,
    clippy::dbg_macro,
    clippy::debug_assert_with_mut_call,
    clippy::doc_markdown,
    clippy::empty_enum,
    clippy::enum_glob_use,
    clippy::exit,
    clippy::explicit_into_iter_loop,
    clippy::filter_map_next,
    clippy::fn_params_excessive_bools,
    clippy::if_let_mutex,
    clippy::imprecise_flops,
    clippy::inefficient_to_string,
    clippy::large_types_passed_by_value,
    clippy::let_unit_value,
    clippy::linkedlist,
    clippy::lossy_float_literal,
    clippy::macro_use_imports,
    clippy::map_err_ignore,
    clippy::map_flatten,
    clippy::map_unwrap_or,
    clippy::match_on_vec_items,
    clippy::match_same_arms,
    clippy::match_wildcard_for_single_variants,
    clippy::mem_forget,
    clippy::mismatched_target_os,
    clippy::needless_borrow,
    clippy::needless_continue,
    clippy::option_option,
    clippy::ref_option_ref,
    clippy::rest_pat_in_fully_bound_structs,
    clippy::string_add_assign,
    clippy::string_add,
    clippy::string_to_string,
    clippy::suboptimal_flops,
    clippy::todo,
    clippy::unimplemented,
    clippy::unnested_or_patterns,
    clippy::unused_self,
    clippy::verbose_file_reads,
    future_incompatible,
    nonstandard_style,
    rust_2018_idioms
)]
// END - Embark standard lints v0.3

//! cfg-expr is a crate that can be used to parse and evaluate Rust `cfg()`
//! expressions, both as declarable in Rust code itself, as well in cargo
//! manifests' `[target.'cfg()'.dependencies]` sections.
//!
//! It contains a list of all builtin targets known to rustc as of `1.54.0` that
//! can be used to determine if a particular cfg expression is satisfiable.
//!
//! ```
//! use cfg_expr::{targets::get_builtin_target_by_triple, Expression, Predicate};
//!
//! let specific = Expression::parse(
//!     r#"all(
//!         target_os = "windows",
//!         target_arch = "x86",
//!         windows,
//!         target_env = "msvc",
//!         target_feature = "fxsr",
//!         target_feature = "sse",
//!         target_feature = "sse2",
//!         target_pointer_width = "32",
//!         target_endian = "little",
//!         not(target_vendor = "uwp"),
//!         feature = "cool_thing",
//!     )"#,
//! )
//! .unwrap();
//!
//! // cfg_expr includes a list of every builtin target in rustc
//! let x86_win = get_builtin_target_by_triple("i686-pc-windows-msvc").unwrap();
//! let x86_pentium_win = get_builtin_target_by_triple("i586-pc-windows-msvc").unwrap();
//! let uwp_win = get_builtin_target_by_triple("i686-uwp-windows-msvc").unwrap();
//! let mac = get_builtin_target_by_triple("x86_64-apple-darwin").unwrap();
//!
//! let avail_targ_feats = ["fxsr", "sse", "sse2"];
//!
//! // This will satisfy all requirements
//! assert!(specific.eval(|pred| {
//!     match pred {
//!         Predicate::Target(tp) => tp.matches(x86_win),
//!         Predicate::TargetFeature(feat) => avail_targ_feats.contains(feat),
//!         Predicate::Feature(feat) => *feat == "cool_thing",
//!         _ => false,
//!     }
//! }));
//!
//! // This won't, it doesnt' have the cool_thing feature!
//! assert!(!specific.eval(|pred| {
//!     match pred {
//!         Predicate::Target(tp) => tp.matches(x86_pentium_win),
//!         Predicate::TargetFeature(feat) => avail_targ_feats.contains(feat),
//!         _ => false,
//!     }
//! }));
//!
//! // This will *not* satisfy the vendor predicate
//! assert!(!specific.eval(|pred| {
//!     match pred {
//!         Predicate::Target(tp) => tp.matches(uwp_win),
//!         Predicate::TargetFeature(feat) => avail_targ_feats.contains(feat),
//!         _ => false,
//!     }
//! }));
//!
//! // This will *not* satisfy the vendor, os, or env predicates
//! assert!(!specific.eval(|pred| {
//!     match pred {
//!         Predicate::Target(tp) => tp.matches(mac),
//!         Predicate::TargetFeature(feat) => avail_targ_feats.contains(feat),
//!         _ => false,
//!     }
//! }));
//! ```

/// Types related to parse errors
pub mod error;
/// Types related to cfg expressions
pub mod expr;
/// Types related to rustc targets
pub mod targets;

pub use error::ParseError;
pub use expr::{Expression, Predicate, TargetPredicate};

#[cfg(feature = "targets")]
pub use target_lexicon;