268 lines
9.3 KiB
Rust
268 lines
9.3 KiB
Rust
//! Configuration settings for [`Engine`].
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use crate::stdlib::{format, string::String};
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use crate::token::{is_valid_identifier, Token};
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use crate::Engine;
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#[cfg(not(feature = "no_module"))]
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use crate::stdlib::boxed::Box;
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impl Engine {
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/// Control whether and how the [`Engine`] will optimize an [`AST`][crate::AST] after compilation.
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///
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/// Not available under the `no_optimize` feature.
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#[cfg(not(feature = "no_optimize"))]
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#[inline(always)]
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pub fn set_optimization_level(
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&mut self,
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optimization_level: crate::OptimizationLevel,
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) -> &mut Self {
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self.optimization_level = optimization_level;
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self
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}
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/// The current optimization level.
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/// It controls whether and how the [`Engine`] will optimize an [`AST`][crate::AST] after compilation.
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///
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/// Not available under the `no_optimize` feature.
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#[cfg(not(feature = "no_optimize"))]
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#[inline(always)]
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pub fn optimization_level(&self) -> crate::OptimizationLevel {
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self.optimization_level
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}
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/// Enable/disable doc-comments.
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#[inline(always)]
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pub fn set_doc_comments(&mut self, enable: bool) -> &mut Self {
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self.disable_doc_comments = !enable;
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self
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}
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/// Set the maximum levels of function calls allowed for a script in order to avoid
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/// infinite recursion and stack overflows.
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#[cfg(not(feature = "unchecked"))]
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#[inline(always)]
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pub fn set_max_call_levels(&mut self, levels: usize) -> &mut Self {
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self.limits.max_call_stack_depth = levels;
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self
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}
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/// The maximum levels of function calls allowed for a script.
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#[cfg(not(feature = "unchecked"))]
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#[inline(always)]
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pub fn max_call_levels(&self) -> usize {
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self.limits.max_call_stack_depth
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}
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/// Set the maximum number of operations allowed for a script to run to avoid
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/// consuming too much resources (0 for unlimited).
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#[cfg(not(feature = "unchecked"))]
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#[inline(always)]
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pub fn set_max_operations(&mut self, operations: u64) -> &mut Self {
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self.limits.max_operations = if operations == u64::MAX {
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0
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} else {
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operations
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};
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self
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}
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/// The maximum number of operations allowed for a script to run (0 for unlimited).
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#[cfg(not(feature = "unchecked"))]
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#[inline(always)]
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pub fn max_operations(&self) -> u64 {
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self.limits.max_operations
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}
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/// Set the maximum number of imported [modules][crate::Module] allowed for a script.
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#[cfg(not(feature = "unchecked"))]
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#[cfg(not(feature = "no_module"))]
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#[inline(always)]
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pub fn set_max_modules(&mut self, modules: usize) -> &mut Self {
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self.limits.max_modules = modules;
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self
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}
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/// The maximum number of imported [modules][crate::Module] allowed for a script.
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#[cfg(not(feature = "unchecked"))]
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#[cfg(not(feature = "no_module"))]
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#[inline(always)]
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pub fn max_modules(&self) -> usize {
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self.limits.max_modules
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}
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/// Set the depth limits for expressions (0 for unlimited).
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#[cfg(not(feature = "unchecked"))]
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#[inline(always)]
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pub fn set_max_expr_depths(
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&mut self,
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max_expr_depth: usize,
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#[cfg(not(feature = "no_function"))] max_function_expr_depth: usize,
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) -> &mut Self {
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self.limits.max_expr_depth = if max_expr_depth == usize::MAX {
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0
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} else {
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max_expr_depth
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};
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#[cfg(not(feature = "no_function"))]
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{
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self.limits.max_function_expr_depth = if max_function_expr_depth == usize::MAX {
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0
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} else {
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max_function_expr_depth
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};
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}
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self
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}
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/// The depth limit for expressions (0 for unlimited).
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#[cfg(not(feature = "unchecked"))]
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#[inline(always)]
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pub fn max_expr_depth(&self) -> usize {
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self.limits.max_expr_depth
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}
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/// The depth limit for expressions in functions (0 for unlimited).
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#[cfg(not(feature = "unchecked"))]
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#[cfg(not(feature = "no_function"))]
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#[inline(always)]
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pub fn max_function_expr_depth(&self) -> usize {
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self.limits.max_function_expr_depth
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}
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/// Set the maximum length of [strings][crate::ImmutableString] (0 for unlimited).
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#[cfg(not(feature = "unchecked"))]
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#[inline(always)]
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pub fn set_max_string_size(&mut self, max_size: usize) -> &mut Self {
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self.limits.max_string_size = if max_size == usize::MAX { 0 } else { max_size };
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self
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}
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/// The maximum length of [strings][crate::ImmutableString] (0 for unlimited).
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#[cfg(not(feature = "unchecked"))]
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#[inline(always)]
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pub fn max_string_size(&self) -> usize {
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self.limits.max_string_size
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}
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/// Set the maximum length of [arrays][crate::Array] (0 for unlimited).
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#[cfg(not(feature = "unchecked"))]
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#[cfg(not(feature = "no_index"))]
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#[inline(always)]
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pub fn set_max_array_size(&mut self, max_size: usize) -> &mut Self {
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self.limits.max_array_size = if max_size == usize::MAX { 0 } else { max_size };
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self
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}
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/// The maximum length of [arrays][crate::Array] (0 for unlimited).
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#[cfg(not(feature = "unchecked"))]
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#[cfg(not(feature = "no_index"))]
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#[inline(always)]
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pub fn max_array_size(&self) -> usize {
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self.limits.max_array_size
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}
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/// Set the maximum length of [object maps][crate::Map] (0 for unlimited).
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#[cfg(not(feature = "unchecked"))]
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#[cfg(not(feature = "no_object"))]
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#[inline(always)]
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pub fn set_max_map_size(&mut self, max_size: usize) -> &mut Self {
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self.limits.max_map_size = if max_size == usize::MAX { 0 } else { max_size };
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self
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}
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/// The maximum length of [object maps][crate::Map] (0 for unlimited).
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#[cfg(not(feature = "unchecked"))]
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#[cfg(not(feature = "no_object"))]
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#[inline(always)]
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pub fn max_map_size(&self) -> usize {
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self.limits.max_map_size
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}
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/// Set the module resolution service used by the [`Engine`].
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///
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/// Not available under the `no_module` feature.
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#[cfg(not(feature = "no_module"))]
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#[inline(always)]
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pub fn set_module_resolver(
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&mut self,
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resolver: Option<impl crate::ModuleResolver + 'static>,
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) -> &mut Self {
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self.module_resolver = resolver.map(|f| Box::new(f) as Box<dyn crate::ModuleResolver>);
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self
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}
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/// Disable a particular keyword or operator in the language.
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///
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/// # Examples
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///
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/// The following will raise an error during parsing because the `if` keyword is disabled
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/// and is recognized as a variable name!
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///
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/// ```rust,should_panic
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/// # fn main() -> Result<(), rhai::ParseError> {
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/// use rhai::Engine;
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///
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/// let mut engine = Engine::new();
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///
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/// engine.disable_symbol("if"); // disable the 'if' keyword
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///
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/// engine.compile("let x = if true { 42 } else { 0 };")?;
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/// // ^ 'if' is rejected as a reserved keyword
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/// # Ok(())
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/// # }
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/// ```
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///
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/// The following will raise an error during parsing because the `+=` operator is disabled.
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///
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/// ```rust,should_panic
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/// # fn main() -> Result<(), rhai::ParseError> {
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/// use rhai::Engine;
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///
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/// let mut engine = Engine::new();
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///
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/// engine.disable_symbol("+="); // disable the '+=' operator
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///
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/// engine.compile("let x = 42; x += 1;")?;
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/// // ^ unknown operator
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/// # Ok(())
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/// # }
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/// ```
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#[inline(always)]
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pub fn disable_symbol(&mut self, symbol: &str) -> &mut Self {
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self.disabled_symbols.insert(symbol.into());
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self
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}
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/// Register a custom operator into the language.
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///
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/// The operator must be a valid identifier (i.e. it cannot be a symbol).
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///
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/// # Example
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///
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/// ```rust
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/// # fn main() -> Result<(), Box<rhai::EvalAltResult>> {
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/// use rhai::{Engine, RegisterFn};
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///
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/// let mut engine = Engine::new();
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///
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/// // Register a custom operator called 'foo' and give it
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/// // a precedence of 160 (i.e. between +|- and *|/).
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/// engine.register_custom_operator("foo", 160).unwrap();
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///
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/// // Register a binary function named 'foo'
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/// engine.register_fn("foo", |x: i64, y: i64| (x * y) - (x + y));
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///
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/// assert_eq!(
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/// engine.eval_expression::<i64>("1 + 2 * 3 foo 4 - 5 / 6")?,
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/// 15
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/// );
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/// # Ok(())
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/// # }
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/// ```
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pub fn register_custom_operator(
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&mut self,
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keyword: &str,
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precedence: u8,
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) -> Result<&mut Self, String> {
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if !is_valid_identifier(keyword.chars()) {
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return Err(format!("not a valid identifier: '{}'", keyword).into());
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}
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match Token::lookup_from_syntax(keyword) {
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// Standard identifiers, reserved keywords and custom keywords are OK
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None | Some(Token::Reserved(_)) | Some(Token::Custom(_)) => (),
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// Disabled keywords are also OK
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Some(token) if !self.disabled_symbols.contains(token.syntax().as_ref()) => (),
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// Active standard keywords cannot be made custom
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Some(_) => return Err(format!("'{}' is a reserved keyword", keyword).into()),
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}
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// Add to custom keywords
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self.custom_keywords
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.insert(keyword.into(), Some(precedence));
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Ok(self)
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}
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}
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