241 lines
6.8 KiB
Rust
241 lines
6.8 KiB
Rust
//! # Rhai - embedded scripting for Rust
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//!
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//! 
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//!
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//! Rhai is a tiny, simple and fast embedded scripting language for Rust
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//! that gives you a safe and easy way to add scripting to your applications.
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//!
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//! It provides a familiar syntax based on JavaScript+Rust and a simple Rust interface.
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//!
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//! # A Quick Example
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//!
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//! ## Contents of `my_script.rhai`
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//!
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//! ```,ignore
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//! /// Brute force factorial function
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//! fn factorial(x) {
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//! if x == 1 { return 1; }
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//! x * factorial(x - 1)
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//! }
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//!
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//! // Calling an external function 'compute'
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//! compute(factorial(10))
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//! ```
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//!
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//! ## The Rust part
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//!
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//! ```,no_run
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//! use rhai::{Engine, EvalAltResult, RegisterFn};
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//!
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//! fn main() -> Result<(), Box<EvalAltResult>>
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//! {
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//! // Define external function
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//! fn compute_something(x: i64) -> bool {
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//! (x % 40) == 0
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//! }
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//!
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//! // Create scripting engine
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//! let mut engine = Engine::new();
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//!
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//! // Register external function as 'compute'
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//! engine.register_fn("compute", compute_something);
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//!
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//! # #[cfg(not(feature = "no_std"))]
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//! # #[cfg(not(any(target_arch = "wasm32", target_arch = "wasm64")))]
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//! assert_eq!(
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//! // Evaluate the script, expects a 'bool' return
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//! engine.eval_file::<bool>("my_script.rhai".into())?,
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//! true
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//! );
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//!
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//! Ok(())
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//! }
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//! ```
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//!
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//! # Documentation
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//!
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//! See [The Rhai Book](https://rhai.rs/book) for details on the Rhai scripting engine and language.
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#![cfg_attr(feature = "no_std", no_std)]
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#[cfg(feature = "no_std")]
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extern crate alloc;
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// Internal modules
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mod ast;
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mod dynamic;
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mod engine;
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mod engine_api;
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mod engine_settings;
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mod fn_args;
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mod fn_builtin;
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mod fn_call;
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mod fn_func;
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mod fn_native;
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mod fn_register;
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mod module;
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mod optimize;
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pub mod packages;
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mod parse_error;
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mod parser;
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pub mod plugin;
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mod result;
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mod scope;
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mod stdlib;
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mod syntax;
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mod token;
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mod r#unsafe;
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mod utils;
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pub type RhaiResult = Result<Dynamic, Box<EvalAltResult>>;
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/// The system integer type. It is defined as [`i64`].
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///
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/// If the `only_i32` feature is enabled, this will be [`i32`] instead.
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#[cfg(not(feature = "only_i32"))]
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pub type INT = i64;
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/// The system integer type.
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/// It is defined as [`i32`] since the `only_i32` feature is used.
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///
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/// If the `only_i32` feature is not used, this will be `i64` instead.
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#[cfg(feature = "only_i32")]
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pub type INT = i32;
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/// The system floating-point type. It is defined as [`f64`].
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///
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/// If the `f32_float` feature is enabled, this will be [`i32`] instead.
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///
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/// Not available under `no_float`.
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#[cfg(not(feature = "no_float"))]
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#[cfg(not(feature = "f32_float"))]
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pub type FLOAT = f64;
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/// The system floating-point type.
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/// It is defined as [`f32`] since the `f32_float` feature is used.
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///
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/// If the `f32_float` feature is not used, this will be `f64` instead.
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///
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/// Not available under `no_float`.
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#[cfg(not(feature = "no_float"))]
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#[cfg(feature = "f32_float")]
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pub type FLOAT = f32;
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pub use ast::{FnAccess, ScriptFnMetadata, AST};
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pub use dynamic::Dynamic;
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pub use engine::{Engine, EvalContext};
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pub use fn_native::{FnPtr, NativeCallContext, Shared};
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pub use fn_register::{RegisterFn, RegisterResultFn};
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pub use module::{FnNamespace, Module};
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pub use parse_error::{LexError, ParseError, ParseErrorType};
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pub use result::EvalAltResult;
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pub use scope::Scope;
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pub use syntax::Expression;
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pub use token::Position;
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pub use utils::ImmutableString;
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#[cfg(not(feature = "no_closure"))]
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use fn_native::Locked;
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#[cfg(feature = "internals")]
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pub use utils::{calc_native_fn_hash, calc_script_fn_hash, HashableHashMap};
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#[cfg(not(feature = "internals"))]
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pub(crate) use utils::{calc_native_fn_hash, calc_script_fn_hash};
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pub use rhai_codegen::*;
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#[cfg(not(feature = "no_function"))]
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pub use fn_func::Func;
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#[cfg(not(feature = "no_function"))]
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pub use fn_args::FuncArgs;
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/// Variable-sized array of [`Dynamic`] values.
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///
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/// Not available under `no_index`.
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#[cfg(not(feature = "no_index"))]
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pub type Array = stdlib::vec::Vec<Dynamic>;
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/// Hash map of [`Dynamic`] values with [`ImmutableString`] keys.
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///
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/// Not available under `no_object`.
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#[cfg(not(feature = "no_object"))]
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pub type Map = stdlib::collections::HashMap<ImmutableString, Dynamic>;
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#[cfg(not(feature = "no_module"))]
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pub use module::ModuleResolver;
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/// Module containing all built-in _module resolvers_ available to Rhai.
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#[cfg(not(feature = "no_module"))]
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pub use module::resolvers as module_resolvers;
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#[cfg(feature = "serde")]
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pub mod serde;
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#[cfg(not(feature = "no_optimize"))]
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pub use optimize::OptimizationLevel;
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// Expose internal data structures.
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#[cfg(feature = "internals")]
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#[deprecated = "this type is volatile and may change"]
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pub use token::{get_next_token, parse_string_literal, InputStream, Token, TokenizeState};
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#[cfg(feature = "internals")]
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#[deprecated = "this type is volatile and may change"]
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pub use ast::{
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ASTNode, BinaryExpr, CustomExpr, Expr, FloatWrapper, FnCallExpr, Ident, ReturnType,
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ScriptFnDef, Stmt,
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};
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#[cfg(feature = "internals")]
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#[deprecated = "this type is volatile and may change"]
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pub use engine::{Imports, State as EvalState};
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#[cfg(feature = "internals")]
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#[cfg(not(feature = "unchecked"))]
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pub use engine::Limits;
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#[cfg(feature = "internals")]
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#[deprecated = "this type is volatile and may change"]
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pub use module::NamespaceRef;
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/// _(INTERNALS)_ Alias to [`smallvec::SmallVec<[T; 4]>`](https://crates.io/crates/smallvec),
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/// which is a specialized [`Vec`] backed by a small, fixed-size array when there are <= 4 items stored.
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/// Exported under the `internals` feature only.
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#[cfg(not(feature = "internals"))]
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type StaticVec<T> = smallvec::SmallVec<[T; 4]>;
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/// _(INTERNALS)_ Alias to [`smallvec::SmallVec<[T; 4]>`](https://crates.io/crates/smallvec),
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/// which is a specialized [`Vec`] backed by a small, fixed-size array when there are <= 4 items stored.
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/// Exported under the `internals` feature only.
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#[cfg(feature = "internals")]
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pub type StaticVec<T> = smallvec::SmallVec<[T; 4]>;
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// Compiler guards against mutually-exclusive feature flags
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#[cfg(feature = "no_float")]
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#[cfg(feature = "f32_float")]
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compile_error!("'f32_float' cannot be used with 'no_float'");
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#[cfg(feature = "no_std")]
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#[cfg(feature = "wasm-bindgen")]
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compile_error!("'wasm-bindgen' cannot be used with 'no-std'");
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#[cfg(feature = "no_std")]
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#[cfg(feature = "stdweb")]
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compile_error!("'stdweb' cannot be used with 'no-std'");
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#[cfg(any(target_arch = "wasm32", target_arch = "wasm64"))]
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#[cfg(feature = "no_std")]
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compile_error!("'no_std' cannot be used for WASM target");
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#[cfg(not(any(target_arch = "wasm32", target_arch = "wasm64")))]
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#[cfg(feature = "wasm-bindgen")]
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compile_error!("'wasm-bindgen' should not be used non-WASM target");
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#[cfg(not(any(target_arch = "wasm32", target_arch = "wasm64")))]
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#[cfg(feature = "stdweb")]
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compile_error!("'stdweb' should not be used non-WASM target");
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