1353 lines
49 KiB
Rust
1353 lines
49 KiB
Rust
//! Implement function-calling mechanism for `Engine`.
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use crate::any::Dynamic;
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use crate::calc_fn_hash;
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use crate::engine::{
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search_imports, search_namespace, search_scope_only, Engine, Imports, State, KEYWORD_DEBUG,
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KEYWORD_EVAL, KEYWORD_FN_PTR, KEYWORD_FN_PTR_CALL, KEYWORD_FN_PTR_CURRY, KEYWORD_IS_SHARED,
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KEYWORD_PRINT, KEYWORD_TYPE_OF,
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};
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use crate::error::ParseErrorType;
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use crate::fn_native::{FnCallArgs, FnPtr};
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use crate::module::{Module, ModuleRef};
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use crate::optimize::OptimizationLevel;
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use crate::parser::{Expr, ImmutableString, AST, INT};
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use crate::result::EvalAltResult;
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use crate::scope::Scope;
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use crate::stdlib::ops::Deref;
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use crate::token::Position;
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use crate::utils::StaticVec;
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#[cfg(not(feature = "no_function"))]
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use crate::{
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parser::ScriptFnDef, r#unsafe::unsafe_cast_var_name_to_lifetime,
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scope::EntryType as ScopeEntryType,
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};
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#[cfg(not(feature = "no_float"))]
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use crate::parser::FLOAT;
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#[cfg(not(feature = "no_index"))]
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use crate::engine::{FN_IDX_GET, FN_IDX_SET};
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#[cfg(not(feature = "no_object"))]
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use crate::engine::{Map, Target, FN_GET, FN_SET};
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#[cfg(not(feature = "no_closure"))]
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#[cfg(not(feature = "no_function"))]
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use crate::scope::Entry as ScopeEntry;
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use crate::stdlib::{
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any::{type_name, TypeId},
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boxed::Box,
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convert::TryFrom,
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format,
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iter::{empty, once},
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mem,
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string::ToString,
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vec::Vec,
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};
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#[cfg(not(feature = "no_closure"))]
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#[cfg(not(feature = "no_function"))]
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use crate::stdlib::{collections::HashSet, string::String};
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#[cfg(feature = "no_std")]
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#[cfg(not(feature = "no_float"))]
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use num_traits::float::Float;
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/// Extract the property name from a getter function name.
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#[inline(always)]
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fn extract_prop_from_getter(_fn_name: &str) -> Option<&str> {
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#[cfg(not(feature = "no_object"))]
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if _fn_name.starts_with(FN_GET) {
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return Some(&_fn_name[FN_GET.len()..]);
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}
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None
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}
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/// Extract the property name from a setter function name.
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#[inline(always)]
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fn extract_prop_from_setter(_fn_name: &str) -> Option<&str> {
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#[cfg(not(feature = "no_object"))]
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if _fn_name.starts_with(FN_SET) {
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return Some(&_fn_name[FN_SET.len()..]);
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}
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None
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}
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/// A type that temporarily stores a mutable reference to a `Dynamic`,
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/// replacing it with a cloned copy.
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#[derive(Debug, Default)]
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struct ArgBackup<'a> {
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orig_mut: Option<&'a mut Dynamic>,
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value_copy: Dynamic,
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}
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impl<'a> ArgBackup<'a> {
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/// This function replaces the first argument of a method call with a clone copy.
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/// This is to prevent a pure function unintentionally consuming the first argument.
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///
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/// `restore_first_arg` must be called before the end of the scope to prevent the shorter lifetime from leaking.
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///
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/// # Safety
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///
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/// This method blindly casts a reference to another lifetime, which saves allocation and string cloning.
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///
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/// If `restore_first_arg` is called before the end of the scope, the shorter lifetime will not leak.
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fn change_first_arg_to_copy(&mut self, normalize: bool, args: &mut FnCallArgs<'a>) {
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// Only do it for method calls with arguments.
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if !normalize || args.is_empty() {
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return;
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}
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// Clone the original value.
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self.value_copy = args[0].clone();
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// Replace the first reference with a reference to the clone, force-casting the lifetime.
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// Must remember to restore it later with `restore_first_arg`.
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//
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// # Safety
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//
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// Blindly casting a reference to another lifetime saves allocation and string cloning,
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// but must be used with the utmost care.
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//
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// We can do this here because, before the end of this scope, we'd restore the original reference
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// via `restore_first_arg`. Therefore this shorter lifetime does not leak.
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self.orig_mut = Some(mem::replace(args.get_mut(0).unwrap(), unsafe {
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mem::transmute(&mut self.value_copy)
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}));
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}
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/// This function restores the first argument that was replaced by `change_first_arg_to_copy`.
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///
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/// # Safety
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///
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/// If `change_first_arg_to_copy` has been called, this function **MUST** be called _BEFORE_ exiting
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/// the current scope. Otherwise it is undefined behavior as the shorter lifetime will leak.
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fn restore_first_arg(&mut self, args: &mut FnCallArgs<'a>) {
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if let Some(this_pointer) = self.orig_mut.take() {
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args[0] = this_pointer;
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}
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}
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}
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impl Drop for ArgBackup<'_> {
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fn drop(&mut self) {
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// Panic if the shorter lifetime leaks.
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assert!(
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self.orig_mut.is_none(),
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"MutBackup::restore has not been called prior to existing this scope"
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);
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}
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}
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// Add captured variables into scope
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#[cfg(not(feature = "no_closure"))]
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#[cfg(not(feature = "no_function"))]
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fn add_captured_variables_into_scope<'s>(
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externals: &HashSet<String>,
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captured: Scope<'s>,
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scope: &mut Scope<'s>,
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) {
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captured
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.into_iter()
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.filter(|ScopeEntry { name, .. }| externals.contains(name.as_ref()))
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.for_each(
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|ScopeEntry {
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name, typ, value, ..
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}| {
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match typ {
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ScopeEntryType::Normal => scope.push(name, value),
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ScopeEntryType::Constant => scope.push_constant(name, value),
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};
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},
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);
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}
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#[inline(always)]
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pub fn ensure_no_data_race(
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fn_name: &str,
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args: &FnCallArgs,
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is_ref: bool,
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) -> Result<(), Box<EvalAltResult>> {
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if cfg!(not(feature = "no_closure")) {
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let skip = if is_ref { 1 } else { 0 };
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if let Some((n, _)) = args
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.iter()
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.skip(skip)
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.enumerate()
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.find(|(_, a)| a.is_locked())
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{
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return EvalAltResult::ErrorDataRace(
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format!("argument #{} of function '{}'", n + 1 + skip, fn_name),
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Position::none(),
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)
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.into();
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}
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}
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Ok(())
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}
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impl Engine {
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/// Call a native Rust function registered with the `Engine`.
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/// Position in `EvalAltResult` is `None` and must be set afterwards.
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///
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/// ## WARNING
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///
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/// Function call arguments be _consumed_ when the function requires them to be passed by value.
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/// All function arguments not in the first position are always passed by value and thus consumed.
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/// **DO NOT** reuse the argument values unless for the first `&mut` argument - all others are silently replaced by `()`!
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pub(crate) fn call_native_fn(
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&self,
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state: &mut State,
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lib: &Module,
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fn_name: &str,
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hash_fn: u64,
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args: &mut FnCallArgs,
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is_ref: bool,
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pub_only: bool,
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def_val: Option<bool>,
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) -> Result<(Dynamic, bool), Box<EvalAltResult>> {
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self.inc_operations(state)?;
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// Search for the native function
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// First search registered functions (can override packages)
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// Then search packages
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let func = self
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.global_module
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.get_fn(hash_fn, pub_only)
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.or_else(|| self.packages.get_fn(hash_fn, pub_only));
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if let Some(func) = func {
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assert!(func.is_native());
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// Calling pure function but the first argument is a reference?
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let mut backup: ArgBackup = Default::default();
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backup.change_first_arg_to_copy(is_ref && func.is_pure(), args);
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// Run external function
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let result = if func.is_plugin_fn() {
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func.get_plugin_fn().call(args)
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} else {
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func.get_native_fn()(self, lib, args)
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};
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// Restore the original reference
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backup.restore_first_arg(args);
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let result = result?;
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// See if the function match print/debug (which requires special processing)
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return Ok(match fn_name {
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KEYWORD_PRINT => (
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(self.print)(result.as_str().map_err(|typ| {
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EvalAltResult::ErrorMismatchOutputType(
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self.map_type_name(type_name::<ImmutableString>()).into(),
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typ.into(),
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Position::none(),
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)
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})?)
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.into(),
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false,
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),
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KEYWORD_DEBUG => (
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(self.debug)(result.as_str().map_err(|typ| {
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EvalAltResult::ErrorMismatchOutputType(
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self.map_type_name(type_name::<ImmutableString>()).into(),
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typ.into(),
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Position::none(),
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)
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})?)
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.into(),
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false,
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),
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_ => (result, func.is_method()),
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});
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}
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// See if it is built in.
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if args.len() == 2 {
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match run_builtin_binary_op(fn_name, args[0], args[1])? {
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Some(v) => return Ok((v, false)),
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None => (),
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}
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}
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// Return default value (if any)
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if let Some(val) = def_val {
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return Ok((val.into(), false));
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}
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// Getter function not found?
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if let Some(prop) = extract_prop_from_getter(fn_name) {
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return EvalAltResult::ErrorDotExpr(
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format!(
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"Unknown property '{}' for {}, or it is write-only",
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prop,
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self.map_type_name(args[0].type_name())
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),
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Position::none(),
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)
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.into();
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}
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// Setter function not found?
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if let Some(prop) = extract_prop_from_setter(fn_name) {
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return EvalAltResult::ErrorDotExpr(
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format!(
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"Unknown property '{}' for {}, or it is read-only",
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prop,
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self.map_type_name(args[0].type_name())
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),
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Position::none(),
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)
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.into();
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}
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// index getter function not found?
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#[cfg(not(feature = "no_index"))]
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if fn_name == FN_IDX_GET && args.len() == 2 {
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return EvalAltResult::ErrorFunctionNotFound(
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format!(
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"{} [{}]",
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self.map_type_name(args[0].type_name()),
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self.map_type_name(args[1].type_name()),
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),
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Position::none(),
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)
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.into();
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}
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// index setter function not found?
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#[cfg(not(feature = "no_index"))]
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if fn_name == FN_IDX_SET {
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return EvalAltResult::ErrorFunctionNotFound(
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format!(
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"{} [{}]=",
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self.map_type_name(args[0].type_name()),
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self.map_type_name(args[1].type_name()),
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),
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Position::none(),
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)
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.into();
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}
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// Raise error
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EvalAltResult::ErrorFunctionNotFound(
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format!(
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"{} ({})",
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fn_name,
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args.iter()
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.map(|name| if name.is::<ImmutableString>() {
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"&str | ImmutableString | String"
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} else {
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self.map_type_name((*name).type_name())
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})
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.collect::<Vec<_>>()
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.join(", ")
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),
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Position::none(),
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)
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.into()
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}
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/// Call a script-defined function.
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/// Position in `EvalAltResult` is `None` and must be set afterwards.
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///
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/// ## WARNING
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///
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/// Function call arguments may be _consumed_ when the function requires them to be passed by value.
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/// All function arguments not in the first position are always passed by value and thus consumed.
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/// **DO NOT** reuse the argument values unless for the first `&mut` argument - all others are silently replaced by `()`!
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#[cfg(not(feature = "no_function"))]
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pub(crate) fn call_script_fn(
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&self,
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scope: &mut Scope,
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mods: &mut Imports,
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state: &mut State,
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lib: &Module,
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this_ptr: &mut Option<&mut Dynamic>,
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fn_name: &str,
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fn_def: &ScriptFnDef,
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args: &mut FnCallArgs,
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level: usize,
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) -> Result<Dynamic, Box<EvalAltResult>> {
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self.inc_operations(state)?;
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// Check for stack overflow
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#[cfg(not(feature = "no_function"))]
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#[cfg(not(feature = "unchecked"))]
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if level > self.limits.max_call_stack_depth {
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return Err(Box::new(
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EvalAltResult::ErrorStackOverflow(Position::none()),
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));
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}
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let orig_scope_level = state.scope_level;
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state.scope_level += 1;
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let prev_scope_len = scope.len();
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let prev_mods_len = mods.len();
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// Put arguments into scope as variables
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// Actually consume the arguments instead of cloning them
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scope.extend(
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fn_def
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.params
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.iter()
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.zip(args.iter_mut().map(|v| mem::take(*v)))
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.map(|(name, value)| {
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let var_name = unsafe_cast_var_name_to_lifetime(name.as_str(), state);
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(var_name, ScopeEntryType::Normal, value)
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}),
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);
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// Evaluate the function at one higher level of call depth
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let result = self
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.eval_stmt(scope, mods, state, lib, this_ptr, &fn_def.body, level + 1)
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.or_else(|err| match *err {
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// Convert return statement to return value
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EvalAltResult::Return(x, _) => Ok(x),
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EvalAltResult::ErrorInFunctionCall(name, err, _) => {
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EvalAltResult::ErrorInFunctionCall(
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format!("{} > {}", fn_name, name),
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err,
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Position::none(),
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)
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.into()
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}
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_ => EvalAltResult::ErrorInFunctionCall(fn_name.to_string(), err, Position::none())
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.into(),
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});
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// Remove all local variables
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scope.rewind(prev_scope_len);
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mods.truncate(prev_mods_len);
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state.scope_level = orig_scope_level;
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|
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result
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}
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|
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// Has a system function an override?
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fn has_override(&self, lib: &Module, hash_fn: u64, hash_script: u64, pub_only: bool) -> bool {
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// NOTE: We skip script functions for global_module and packages, and native functions for lib
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|
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// First check script-defined functions
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lib.contains_fn(hash_script, pub_only)
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//|| lib.contains_fn(hash_fn, pub_only)
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// Then check registered functions
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//|| self.global_module.contains_fn(hash_script, pub_only)
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|| self.global_module.contains_fn(hash_fn, pub_only)
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// Then check packages
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|| self.packages.contains_fn(hash_script, pub_only)
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|| self.packages.contains_fn(hash_fn, pub_only)
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}
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|
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/// Perform an actual function call, native Rust or scripted, taking care of special functions.
|
|
/// Position in `EvalAltResult` is `None` and must be set afterwards.
|
|
///
|
|
/// ## WARNING
|
|
///
|
|
/// Function call arguments may be _consumed_ when the function requires them to be passed by value.
|
|
/// All function arguments not in the first position are always passed by value and thus consumed.
|
|
/// **DO NOT** reuse the argument values unless for the first `&mut` argument - all others are silently replaced by `()`!
|
|
pub(crate) fn exec_fn_call(
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|
&self,
|
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state: &mut State,
|
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lib: &Module,
|
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fn_name: &str,
|
|
hash_script: u64,
|
|
args: &mut FnCallArgs,
|
|
is_ref: bool,
|
|
_is_method: bool,
|
|
pub_only: bool,
|
|
_capture: Option<Scope>,
|
|
def_val: Option<bool>,
|
|
_level: usize,
|
|
) -> Result<(Dynamic, bool), Box<EvalAltResult>> {
|
|
// Check for data race.
|
|
if cfg!(not(feature = "no_closure")) {
|
|
ensure_no_data_race(fn_name, args, is_ref)?;
|
|
}
|
|
|
|
// Qualifiers (none) + function name + number of arguments + argument `TypeId`'s.
|
|
let arg_types = args.iter().map(|a| a.type_id());
|
|
let hash_fn = calc_fn_hash(
|
|
empty(),
|
|
fn_name,
|
|
if args.is_empty() {
|
|
// Distinguish between a script function and a native function with no parameters
|
|
usize::MAX
|
|
} else {
|
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args.len()
|
|
},
|
|
arg_types,
|
|
);
|
|
|
|
match fn_name {
|
|
// type_of
|
|
KEYWORD_TYPE_OF
|
|
if args.len() == 1 && !self.has_override(lib, hash_fn, hash_script, pub_only) =>
|
|
{
|
|
Ok((
|
|
self.map_type_name(args[0].type_name()).to_string().into(),
|
|
false,
|
|
))
|
|
}
|
|
|
|
// Fn
|
|
KEYWORD_FN_PTR
|
|
if args.len() == 1 && !self.has_override(lib, hash_fn, hash_script, pub_only) =>
|
|
{
|
|
EvalAltResult::ErrorRuntime(
|
|
"'Fn' should not be called in method style. Try Fn(...);".into(),
|
|
Position::none(),
|
|
)
|
|
.into()
|
|
}
|
|
|
|
// eval - reaching this point it must be a method-style call
|
|
KEYWORD_EVAL
|
|
if args.len() == 1 && !self.has_override(lib, hash_fn, hash_script, pub_only) =>
|
|
{
|
|
EvalAltResult::ErrorRuntime(
|
|
"'eval' should not be called in method style. Try eval(...);".into(),
|
|
Position::none(),
|
|
)
|
|
.into()
|
|
}
|
|
|
|
// Normal script function call
|
|
#[cfg(not(feature = "no_function"))]
|
|
_ if lib.contains_fn(hash_script, pub_only)
|
|
|| self.packages.contains_fn(hash_script, pub_only) =>
|
|
{
|
|
// Get scripted function
|
|
let func = lib
|
|
.get_fn(hash_script, pub_only)
|
|
.or_else(|| self.packages.get_fn(hash_script, pub_only))
|
|
.unwrap()
|
|
.get_fn_def();
|
|
|
|
let scope = &mut Scope::new();
|
|
let mods = &mut Imports::new();
|
|
|
|
// Add captured variables into scope
|
|
#[cfg(not(feature = "no_closure"))]
|
|
if let Some(captured) = _capture {
|
|
add_captured_variables_into_scope(&func.externals, captured, scope);
|
|
}
|
|
|
|
let result = if _is_method {
|
|
// Method call of script function - map first argument to `this`
|
|
let (first, rest) = args.split_first_mut().unwrap();
|
|
self.call_script_fn(
|
|
scope,
|
|
mods,
|
|
state,
|
|
lib,
|
|
&mut Some(*first),
|
|
fn_name,
|
|
func,
|
|
rest,
|
|
_level,
|
|
)?
|
|
} else {
|
|
// Normal call of script function - map first argument to `this`
|
|
// The first argument is a reference?
|
|
let mut backup: ArgBackup = Default::default();
|
|
backup.change_first_arg_to_copy(is_ref, args);
|
|
|
|
let result = self.call_script_fn(
|
|
scope, mods, state, lib, &mut None, fn_name, func, args, _level,
|
|
);
|
|
|
|
// Restore the original reference
|
|
backup.restore_first_arg(args);
|
|
|
|
result?
|
|
};
|
|
|
|
Ok((result, false))
|
|
}
|
|
|
|
// Normal native function call
|
|
_ => self.call_native_fn(
|
|
state, lib, fn_name, hash_fn, args, is_ref, pub_only, def_val,
|
|
),
|
|
}
|
|
}
|
|
|
|
/// Evaluate a text string as a script - used primarily for 'eval'.
|
|
/// Position in `EvalAltResult` is `None` and must be set afterwards.
|
|
fn eval_script_expr(
|
|
&self,
|
|
scope: &mut Scope,
|
|
mods: &mut Imports,
|
|
state: &mut State,
|
|
lib: &Module,
|
|
script_expr: &Dynamic,
|
|
_level: usize,
|
|
) -> Result<Dynamic, Box<EvalAltResult>> {
|
|
self.inc_operations(state)?;
|
|
|
|
// Check for stack overflow
|
|
#[cfg(not(feature = "no_function"))]
|
|
#[cfg(not(feature = "unchecked"))]
|
|
if _level > self.limits.max_call_stack_depth {
|
|
return Err(Box::new(
|
|
EvalAltResult::ErrorStackOverflow(Position::none()),
|
|
));
|
|
}
|
|
|
|
let script = script_expr.as_str().map_err(|typ| {
|
|
EvalAltResult::ErrorMismatchOutputType(
|
|
self.map_type_name(type_name::<ImmutableString>()).into(),
|
|
typ.into(),
|
|
Position::none(),
|
|
)
|
|
})?;
|
|
|
|
// Compile the script text
|
|
// No optimizations because we only run it once
|
|
let mut ast = self.compile_with_scope_and_optimization_level(
|
|
&Scope::new(),
|
|
&[script],
|
|
OptimizationLevel::None,
|
|
)?;
|
|
|
|
// If new functions are defined within the eval string, it is an error
|
|
if ast.lib().num_fn() != 0 {
|
|
return Err(ParseErrorType::WrongFnDefinition.into());
|
|
}
|
|
|
|
let statements = mem::take(ast.statements_mut());
|
|
let ast = AST::new(statements, lib.clone());
|
|
|
|
// Evaluate the AST
|
|
let (result, operations) = self.eval_ast_with_scope_raw(scope, mods, &ast)?;
|
|
|
|
state.operations += operations;
|
|
self.inc_operations(state)?;
|
|
|
|
return Ok(result);
|
|
}
|
|
|
|
/// Call a dot method.
|
|
/// Position in `EvalAltResult` is `None` and must be set afterwards.
|
|
#[cfg(not(feature = "no_object"))]
|
|
pub(crate) fn make_method_call(
|
|
&self,
|
|
state: &mut State,
|
|
lib: &Module,
|
|
name: &str,
|
|
hash_script: u64,
|
|
target: &mut Target,
|
|
idx_val: Dynamic,
|
|
def_val: Option<bool>,
|
|
native: bool,
|
|
pub_only: bool,
|
|
level: usize,
|
|
) -> Result<(Dynamic, bool), Box<EvalAltResult>> {
|
|
let is_ref = target.is_ref();
|
|
let is_value = target.is_value();
|
|
|
|
// Get a reference to the mutation target Dynamic
|
|
let obj = target.as_mut();
|
|
let mut idx = idx_val.cast::<StaticVec<Dynamic>>();
|
|
let mut _fn_name = name;
|
|
|
|
let (result, updated) = if _fn_name == KEYWORD_FN_PTR_CALL && obj.is::<FnPtr>() {
|
|
// FnPtr call
|
|
let fn_ptr = obj.read_lock::<FnPtr>().unwrap();
|
|
let mut curry = fn_ptr.curry().iter().cloned().collect::<StaticVec<_>>();
|
|
// Redirect function name
|
|
let fn_name = fn_ptr.fn_name();
|
|
// Recalculate hash
|
|
let hash = if native {
|
|
0
|
|
} else {
|
|
calc_fn_hash(empty(), fn_name, curry.len() + idx.len(), empty())
|
|
};
|
|
// Arguments are passed as-is, adding the curried arguments
|
|
let mut arg_values = curry
|
|
.iter_mut()
|
|
.chain(idx.iter_mut())
|
|
.collect::<StaticVec<_>>();
|
|
let args = arg_values.as_mut();
|
|
|
|
// Map it to name(args) in function-call style
|
|
self.exec_fn_call(
|
|
state, lib, fn_name, hash, args, false, false, pub_only, None, def_val, level,
|
|
)
|
|
} else if _fn_name == KEYWORD_FN_PTR_CALL && idx.len() > 0 && idx[0].is::<FnPtr>() {
|
|
// FnPtr call on object
|
|
let fn_ptr = idx.remove(0).cast::<FnPtr>();
|
|
let mut curry = fn_ptr.curry().iter().cloned().collect::<StaticVec<_>>();
|
|
// Redirect function name
|
|
let fn_name = fn_ptr.get_fn_name().clone();
|
|
// Recalculate hash
|
|
let hash = if native {
|
|
0
|
|
} else {
|
|
calc_fn_hash(empty(), &fn_name, curry.len() + idx.len(), empty())
|
|
};
|
|
// Replace the first argument with the object pointer, adding the curried arguments
|
|
let mut arg_values = once(obj)
|
|
.chain(curry.iter_mut())
|
|
.chain(idx.iter_mut())
|
|
.collect::<StaticVec<_>>();
|
|
let args = arg_values.as_mut();
|
|
|
|
// Map it to name(args) in function-call style
|
|
self.exec_fn_call(
|
|
state, lib, &fn_name, hash, args, is_ref, true, pub_only, None, def_val, level,
|
|
)
|
|
} else if _fn_name == KEYWORD_FN_PTR_CURRY && obj.is::<FnPtr>() {
|
|
// Curry call
|
|
let fn_ptr = obj.read_lock::<FnPtr>().unwrap();
|
|
Ok((
|
|
FnPtr::new_unchecked(
|
|
fn_ptr.get_fn_name().clone(),
|
|
fn_ptr
|
|
.curry()
|
|
.iter()
|
|
.cloned()
|
|
.chain(idx.into_iter())
|
|
.collect(),
|
|
)
|
|
.into(),
|
|
false,
|
|
))
|
|
} else if cfg!(not(feature = "no_closure"))
|
|
&& _fn_name == KEYWORD_IS_SHARED
|
|
&& idx.is_empty()
|
|
{
|
|
// is_shared call
|
|
Ok((target.is_shared().into(), false))
|
|
} else {
|
|
#[cfg(not(feature = "no_object"))]
|
|
let redirected;
|
|
let mut hash = hash_script;
|
|
|
|
// Check if it is a map method call in OOP style
|
|
#[cfg(not(feature = "no_object"))]
|
|
if let Some(map) = obj.read_lock::<Map>() {
|
|
if let Some(val) = map.get(_fn_name) {
|
|
if let Some(fn_ptr) = val.read_lock::<FnPtr>() {
|
|
// Remap the function name
|
|
redirected = fn_ptr.get_fn_name().clone();
|
|
_fn_name = &redirected;
|
|
// Add curried arguments
|
|
if !fn_ptr.curry().is_empty() {
|
|
fn_ptr
|
|
.curry()
|
|
.iter()
|
|
.cloned()
|
|
.enumerate()
|
|
.for_each(|(i, v)| idx.insert(i, v));
|
|
}
|
|
// Recalculate the hash based on the new function name and new arguments
|
|
hash = if native {
|
|
0
|
|
} else {
|
|
calc_fn_hash(empty(), _fn_name, idx.len(), empty())
|
|
};
|
|
}
|
|
}
|
|
};
|
|
|
|
if native {
|
|
hash = 0;
|
|
}
|
|
|
|
// Attached object pointer in front of the arguments
|
|
let mut arg_values = once(obj).chain(idx.iter_mut()).collect::<StaticVec<_>>();
|
|
let args = arg_values.as_mut();
|
|
|
|
self.exec_fn_call(
|
|
state, lib, _fn_name, hash, args, is_ref, true, pub_only, None, def_val, level,
|
|
)
|
|
}?;
|
|
|
|
// Feed the changed temp value back
|
|
if updated && !is_ref && !is_value {
|
|
let new_val = target.as_mut().clone();
|
|
target.set_value(new_val)?;
|
|
}
|
|
|
|
Ok((result, updated))
|
|
}
|
|
|
|
/// Call a function in normal function-call style.
|
|
/// Position in `EvalAltResult` is `None` and must be set afterwards.
|
|
pub(crate) fn make_function_call(
|
|
&self,
|
|
scope: &mut Scope,
|
|
mods: &mut Imports,
|
|
state: &mut State,
|
|
lib: &Module,
|
|
this_ptr: &mut Option<&mut Dynamic>,
|
|
name: &str,
|
|
args_expr: &[Expr],
|
|
def_val: Option<bool>,
|
|
mut hash_script: u64,
|
|
native: bool,
|
|
pub_only: bool,
|
|
capture: bool,
|
|
level: usize,
|
|
) -> Result<Dynamic, Box<EvalAltResult>> {
|
|
// Handle Fn()
|
|
if name == KEYWORD_FN_PTR && args_expr.len() == 1 {
|
|
let hash_fn = calc_fn_hash(empty(), name, 1, once(TypeId::of::<ImmutableString>()));
|
|
|
|
if !self.has_override(lib, hash_fn, hash_script, pub_only) {
|
|
// Fn - only in function call style
|
|
let expr = args_expr.get(0).unwrap();
|
|
let arg_value = self.eval_expr(scope, mods, state, lib, this_ptr, expr, level)?;
|
|
|
|
return arg_value
|
|
.take_immutable_string()
|
|
.map_err(|typ| {
|
|
EvalAltResult::ErrorMismatchOutputType(
|
|
self.map_type_name(type_name::<ImmutableString>()).into(),
|
|
typ.into(),
|
|
expr.position(),
|
|
)
|
|
.into()
|
|
})
|
|
.and_then(|s| FnPtr::try_from(s))
|
|
.map(Into::<Dynamic>::into)
|
|
.map_err(|err| err.new_position(expr.position()));
|
|
}
|
|
}
|
|
|
|
// Handle curry()
|
|
if name == KEYWORD_FN_PTR_CURRY && args_expr.len() > 1 {
|
|
let expr = args_expr.get(0).unwrap();
|
|
let fn_ptr = self.eval_expr(scope, mods, state, lib, this_ptr, expr, level)?;
|
|
|
|
if !fn_ptr.is::<FnPtr>() {
|
|
return EvalAltResult::ErrorMismatchOutputType(
|
|
self.map_type_name(type_name::<FnPtr>()).into(),
|
|
self.map_type_name(fn_ptr.type_name()).into(),
|
|
expr.position(),
|
|
)
|
|
.into();
|
|
}
|
|
|
|
let (fn_name, fn_curry) = fn_ptr.cast::<FnPtr>().take_data();
|
|
|
|
let curry: StaticVec<_> = args_expr
|
|
.iter()
|
|
.skip(1)
|
|
.map(|expr| self.eval_expr(scope, mods, state, lib, this_ptr, expr, level))
|
|
.collect::<Result<_, _>>()?;
|
|
|
|
return Ok(FnPtr::new_unchecked(
|
|
fn_name,
|
|
fn_curry.into_iter().chain(curry.into_iter()).collect(),
|
|
)
|
|
.into());
|
|
}
|
|
|
|
// Handle is_shared()
|
|
if cfg!(not(feature = "no_closure")) && name == KEYWORD_IS_SHARED && args_expr.len() == 1 {
|
|
let expr = args_expr.get(0).unwrap();
|
|
let value = self.eval_expr(scope, mods, state, lib, this_ptr, expr, level)?;
|
|
|
|
return Ok(value.is_shared().into());
|
|
}
|
|
|
|
// Handle call() - Redirect function call
|
|
let redirected;
|
|
let mut args_expr = args_expr.as_ref();
|
|
let mut curry: StaticVec<_> = Default::default();
|
|
let mut name = name;
|
|
|
|
if name == KEYWORD_FN_PTR_CALL
|
|
&& args_expr.len() >= 1
|
|
&& !self.has_override(lib, 0, hash_script, pub_only)
|
|
{
|
|
let expr = args_expr.get(0).unwrap();
|
|
let fn_name = self.eval_expr(scope, mods, state, lib, this_ptr, expr, level)?;
|
|
|
|
if fn_name.is::<FnPtr>() {
|
|
let fn_ptr = fn_name.cast::<FnPtr>();
|
|
curry = fn_ptr.curry().iter().cloned().collect();
|
|
// Redirect function name
|
|
redirected = fn_ptr.take_data().0;
|
|
name = &redirected;
|
|
// Skip the first argument
|
|
args_expr = &args_expr.as_ref()[1..];
|
|
// Recalculate hash
|
|
hash_script = calc_fn_hash(empty(), name, curry.len() + args_expr.len(), empty());
|
|
} else {
|
|
return EvalAltResult::ErrorMismatchOutputType(
|
|
self.map_type_name(type_name::<FnPtr>()).into(),
|
|
fn_name.type_name().into(),
|
|
expr.position(),
|
|
)
|
|
.into();
|
|
}
|
|
}
|
|
|
|
// Handle eval()
|
|
if name == KEYWORD_EVAL && args_expr.len() == 1 {
|
|
let hash_fn = calc_fn_hash(empty(), name, 1, once(TypeId::of::<ImmutableString>()));
|
|
|
|
if !self.has_override(lib, hash_fn, hash_script, pub_only) {
|
|
// eval - only in function call style
|
|
let prev_len = scope.len();
|
|
let expr = args_expr.get(0).unwrap();
|
|
let script = self.eval_expr(scope, mods, state, lib, this_ptr, expr, level)?;
|
|
let result = self
|
|
.eval_script_expr(scope, mods, state, lib, &script, level + 1)
|
|
.map_err(|err| err.new_position(expr.position()));
|
|
|
|
// IMPORTANT! If the eval defines new variables in the current scope,
|
|
// all variable offsets from this point on will be mis-aligned.
|
|
if scope.len() != prev_len {
|
|
state.always_search = true;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
}
|
|
|
|
// Normal function call - except for Fn, curry, call and eval (handled above)
|
|
let mut arg_values: StaticVec<_>;
|
|
let mut args: StaticVec<_>;
|
|
let mut is_ref = false;
|
|
let capture = if cfg!(not(feature = "no_closure")) && capture && !scope.is_empty() {
|
|
Some(scope.flatten_clone())
|
|
} else {
|
|
None
|
|
};
|
|
|
|
if args_expr.is_empty() && curry.is_empty() {
|
|
// No arguments
|
|
args = Default::default();
|
|
} else {
|
|
// If the first argument is a variable, and there is no curried arguments, convert to method-call style
|
|
// in order to leverage potential &mut first argument and avoid cloning the value
|
|
match args_expr.get(0).unwrap() {
|
|
// func(x, ...) -> x.func(...)
|
|
lhs @ Expr::Variable(_) if curry.is_empty() => {
|
|
arg_values = args_expr
|
|
.iter()
|
|
.skip(1)
|
|
.map(|expr| self.eval_expr(scope, mods, state, lib, this_ptr, expr, level))
|
|
.collect::<Result<_, _>>()?;
|
|
|
|
let (target, _, _, pos) = search_namespace(scope, mods, state, this_ptr, lhs)?;
|
|
|
|
self.inc_operations(state)
|
|
.map_err(|err| err.new_position(pos))?;
|
|
|
|
args = if target.is_shared() {
|
|
arg_values.insert(0, target.flatten_clone());
|
|
arg_values.iter_mut().collect()
|
|
} else {
|
|
// Turn it into a method call only if the object is not shared
|
|
is_ref = true;
|
|
once(target).chain(arg_values.iter_mut()).collect()
|
|
};
|
|
}
|
|
// func(..., ...)
|
|
_ => {
|
|
arg_values = args_expr
|
|
.iter()
|
|
.map(|expr| self.eval_expr(scope, mods, state, lib, this_ptr, expr, level))
|
|
.collect::<Result<_, _>>()?;
|
|
|
|
args = curry.iter_mut().chain(arg_values.iter_mut()).collect();
|
|
}
|
|
}
|
|
}
|
|
|
|
let hash = if native { 0 } else { hash_script };
|
|
let args = args.as_mut();
|
|
|
|
self.exec_fn_call(
|
|
state, lib, name, hash, args, is_ref, false, pub_only, capture, def_val, level,
|
|
)
|
|
.map(|(v, _)| v)
|
|
}
|
|
|
|
/// Call a module-qualified function in normal function-call style.
|
|
/// Position in `EvalAltResult` is `None` and must be set afterwards.
|
|
pub(crate) fn make_qualified_function_call(
|
|
&self,
|
|
scope: &mut Scope,
|
|
mods: &mut Imports,
|
|
state: &mut State,
|
|
lib: &Module,
|
|
this_ptr: &mut Option<&mut Dynamic>,
|
|
modules: &Option<Box<ModuleRef>>,
|
|
name: &str,
|
|
args_expr: &[Expr],
|
|
def_val: Option<bool>,
|
|
hash_script: u64,
|
|
_capture: bool,
|
|
level: usize,
|
|
) -> Result<Dynamic, Box<EvalAltResult>> {
|
|
let modules = modules.as_ref().unwrap();
|
|
let mut arg_values: StaticVec<_>;
|
|
let mut first_arg_value = None;
|
|
let mut args: StaticVec<_>;
|
|
|
|
if args_expr.is_empty() {
|
|
// No arguments
|
|
args = Default::default();
|
|
} else {
|
|
// See if the first argument is a variable (not module-qualified).
|
|
// If so, convert to method-call style in order to leverage potential
|
|
// &mut first argument and avoid cloning the value
|
|
match args_expr.get(0).unwrap() {
|
|
// func(x, ...) -> x.func(...)
|
|
Expr::Variable(x) if x.1.is_none() => {
|
|
arg_values = args_expr
|
|
.iter()
|
|
.enumerate()
|
|
.map(|(i, expr)| {
|
|
// Skip the first argument
|
|
if i == 0 {
|
|
Ok(Default::default())
|
|
} else {
|
|
self.eval_expr(scope, mods, state, lib, this_ptr, expr, level)
|
|
}
|
|
})
|
|
.collect::<Result<_, _>>()?;
|
|
|
|
// Get target reference to first argument
|
|
let (target, _, _, pos) =
|
|
search_scope_only(scope, state, this_ptr, args_expr.get(0).unwrap())?;
|
|
|
|
self.inc_operations(state)
|
|
.map_err(|err| err.new_position(pos))?;
|
|
|
|
let (first, rest) = arg_values.split_first_mut().unwrap();
|
|
first_arg_value = Some(first);
|
|
|
|
args = once(target).chain(rest.iter_mut()).collect();
|
|
}
|
|
// func(..., ...) or func(mod::x, ...)
|
|
_ => {
|
|
arg_values = args_expr
|
|
.iter()
|
|
.map(|expr| self.eval_expr(scope, mods, state, lib, this_ptr, expr, level))
|
|
.collect::<Result<_, _>>()?;
|
|
|
|
args = arg_values.iter_mut().collect();
|
|
}
|
|
}
|
|
}
|
|
|
|
let module = search_imports(mods, state, modules)?;
|
|
|
|
// First search in script-defined functions (can override built-in)
|
|
let func = match module.get_qualified_fn(hash_script) {
|
|
// Then search in Rust functions
|
|
None => {
|
|
self.inc_operations(state)?;
|
|
|
|
// Qualified Rust functions are indexed in two steps:
|
|
// 1) Calculate a hash in a similar manner to script-defined functions,
|
|
// i.e. qualifiers + function name + number of arguments.
|
|
// 2) Calculate a second hash with no qualifiers, empty function name,
|
|
// zero number of arguments, and the actual list of argument `TypeId`'.s
|
|
let hash_fn_args = calc_fn_hash(empty(), "", 0, args.iter().map(|a| a.type_id()));
|
|
// 3) The final hash is the XOR of the two hashes.
|
|
let hash_qualified_fn = hash_script ^ hash_fn_args;
|
|
|
|
module.get_qualified_fn(hash_qualified_fn)
|
|
}
|
|
r => r,
|
|
};
|
|
|
|
match func {
|
|
#[cfg(not(feature = "no_function"))]
|
|
Some(f) if f.is_script() => {
|
|
// Clone first argument
|
|
if let Some(first) = first_arg_value {
|
|
let first_val = args[0].clone();
|
|
args[0] = first;
|
|
*args[0] = first_val;
|
|
}
|
|
|
|
let args = args.as_mut();
|
|
let func = f.get_fn_def();
|
|
|
|
let scope = &mut Scope::new();
|
|
let mods = &mut Imports::new();
|
|
|
|
// Add captured variables into scope
|
|
#[cfg(not(feature = "no_closure"))]
|
|
if _capture && !scope.is_empty() {
|
|
add_captured_variables_into_scope(
|
|
&func.externals,
|
|
scope.flatten_clone(),
|
|
scope,
|
|
);
|
|
}
|
|
|
|
self.call_script_fn(scope, mods, state, lib, &mut None, name, func, args, level)
|
|
}
|
|
Some(f) if f.is_plugin_fn() => f.get_plugin_fn().call(args.as_mut()),
|
|
Some(f) if f.is_native() => {
|
|
if !f.is_method() {
|
|
// Clone first argument
|
|
if let Some(first) = first_arg_value {
|
|
let first_val = args[0].clone();
|
|
args[0] = first;
|
|
*args[0] = first_val;
|
|
}
|
|
}
|
|
|
|
f.get_native_fn()(self, lib, args.as_mut())
|
|
}
|
|
Some(_) => unreachable!(),
|
|
None if def_val.is_some() => Ok(def_val.unwrap().into()),
|
|
None => EvalAltResult::ErrorFunctionNotFound(
|
|
format!(
|
|
"{}{} ({})",
|
|
modules,
|
|
name,
|
|
args.iter()
|
|
.map(|a| if a.is::<ImmutableString>() {
|
|
"&str | ImmutableString | String"
|
|
} else {
|
|
self.map_type_name((*a).type_name())
|
|
})
|
|
.collect::<Vec<_>>()
|
|
.join(", ")
|
|
),
|
|
Position::none(),
|
|
)
|
|
.into(),
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Build in common binary operator implementations to avoid the cost of calling a registered function.
|
|
pub fn run_builtin_binary_op(
|
|
op: &str,
|
|
x: &Dynamic,
|
|
y: &Dynamic,
|
|
) -> Result<Option<Dynamic>, Box<EvalAltResult>> {
|
|
use crate::packages::arithmetic::arith_basic::INT::functions::*;
|
|
|
|
let args_type = x.type_id();
|
|
|
|
if y.type_id() != args_type {
|
|
return Ok(None);
|
|
}
|
|
|
|
if args_type == TypeId::of::<INT>() {
|
|
let x = x.clone().cast::<INT>();
|
|
let y = y.clone().cast::<INT>();
|
|
|
|
if cfg!(not(feature = "unchecked")) {
|
|
match op {
|
|
"+" => return add(x, y).map(Some),
|
|
"-" => return subtract(x, y).map(Some),
|
|
"*" => return multiply(x, y).map(Some),
|
|
"/" => return divide(x, y).map(Some),
|
|
"%" => return modulo(x, y).map(Some),
|
|
"~" => return power(x, y).map(Some),
|
|
">>" => return shift_right(x, y).map(Some),
|
|
"<<" => return shift_left(x, y).map(Some),
|
|
_ => (),
|
|
}
|
|
} else {
|
|
match op {
|
|
"+" => return Ok(Some((x + y).into())),
|
|
"-" => return Ok(Some((x - y).into())),
|
|
"*" => return Ok(Some((x * y).into())),
|
|
"/" => return Ok(Some((x / y).into())),
|
|
"%" => return Ok(Some((x % y).into())),
|
|
"~" => return Ok(Some(x.pow(y as u32).into())),
|
|
">>" => return Ok(Some((x >> y).into())),
|
|
"<<" => return Ok(Some((x << y).into())),
|
|
_ => (),
|
|
}
|
|
}
|
|
|
|
match op {
|
|
"==" => return Ok(Some((x == y).into())),
|
|
"!=" => return Ok(Some((x != y).into())),
|
|
">" => return Ok(Some((x > y).into())),
|
|
">=" => return Ok(Some((x >= y).into())),
|
|
"<" => return Ok(Some((x < y).into())),
|
|
"<=" => return Ok(Some((x <= y).into())),
|
|
"&" => return Ok(Some((x & y).into())),
|
|
"|" => return Ok(Some((x | y).into())),
|
|
"^" => return Ok(Some((x ^ y).into())),
|
|
_ => (),
|
|
}
|
|
} else if args_type == TypeId::of::<bool>() {
|
|
let x = x.clone().cast::<bool>();
|
|
let y = y.clone().cast::<bool>();
|
|
|
|
match op {
|
|
"&" => return Ok(Some((x && y).into())),
|
|
"|" => return Ok(Some((x || y).into())),
|
|
"^" => return Ok(Some((x ^ y).into())),
|
|
"==" => return Ok(Some((x == y).into())),
|
|
"!=" => return Ok(Some((x != y).into())),
|
|
_ => (),
|
|
}
|
|
} else if args_type == TypeId::of::<ImmutableString>() {
|
|
let x = &*x.read_lock::<ImmutableString>().unwrap();
|
|
let y = &*y.read_lock::<ImmutableString>().unwrap();
|
|
|
|
match op {
|
|
"+" => return Ok(Some((x + y).into())),
|
|
"==" => return Ok(Some((x == y).into())),
|
|
"!=" => return Ok(Some((x != y).into())),
|
|
">" => return Ok(Some((x > y).into())),
|
|
">=" => return Ok(Some((x >= y).into())),
|
|
"<" => return Ok(Some((x < y).into())),
|
|
"<=" => return Ok(Some((x <= y).into())),
|
|
_ => (),
|
|
}
|
|
} else if args_type == TypeId::of::<char>() {
|
|
let x = x.clone().cast::<char>();
|
|
let y = y.clone().cast::<char>();
|
|
|
|
match op {
|
|
"==" => return Ok(Some((x == y).into())),
|
|
"!=" => return Ok(Some((x != y).into())),
|
|
">" => return Ok(Some((x > y).into())),
|
|
">=" => return Ok(Some((x >= y).into())),
|
|
"<" => return Ok(Some((x < y).into())),
|
|
"<=" => return Ok(Some((x <= y).into())),
|
|
_ => (),
|
|
}
|
|
} else if args_type == TypeId::of::<()>() {
|
|
match op {
|
|
"==" => return Ok(Some(true.into())),
|
|
"!=" | ">" | ">=" | "<" | "<=" => return Ok(Some(false.into())),
|
|
_ => (),
|
|
}
|
|
}
|
|
|
|
#[cfg(not(feature = "no_float"))]
|
|
if args_type == TypeId::of::<FLOAT>() {
|
|
let x = x.clone().cast::<FLOAT>();
|
|
let y = y.clone().cast::<FLOAT>();
|
|
|
|
match op {
|
|
"+" => return Ok(Some((x + y).into())),
|
|
"-" => return Ok(Some((x - y).into())),
|
|
"*" => return Ok(Some((x * y).into())),
|
|
"/" => return Ok(Some((x / y).into())),
|
|
"%" => return Ok(Some((x % y).into())),
|
|
"~" => return Ok(Some(x.powf(y).into())),
|
|
"==" => return Ok(Some((x == y).into())),
|
|
"!=" => return Ok(Some((x != y).into())),
|
|
">" => return Ok(Some((x > y).into())),
|
|
">=" => return Ok(Some((x >= y).into())),
|
|
"<" => return Ok(Some((x < y).into())),
|
|
"<=" => return Ok(Some((x <= y).into())),
|
|
_ => (),
|
|
}
|
|
}
|
|
|
|
Ok(None)
|
|
}
|
|
|
|
/// Build in common operator assignment implementations to avoid the cost of calling a registered function.
|
|
pub fn run_builtin_op_assignment(
|
|
op: &str,
|
|
x: &mut Dynamic,
|
|
y: &Dynamic,
|
|
) -> Result<Option<()>, Box<EvalAltResult>> {
|
|
use crate::packages::arithmetic::arith_basic::INT::functions::*;
|
|
|
|
let args_type = x.type_id();
|
|
|
|
if y.type_id() != args_type {
|
|
return Ok(None);
|
|
}
|
|
|
|
if args_type == TypeId::of::<INT>() {
|
|
let y = y.clone().cast::<INT>();
|
|
let mut x = x.write_lock::<INT>().unwrap();
|
|
|
|
if cfg!(not(feature = "unchecked")) {
|
|
match op {
|
|
"+=" => return Ok(Some(*x = add(*x, y)?.as_int().unwrap())),
|
|
"-=" => return Ok(Some(*x = subtract(*x, y)?.as_int().unwrap())),
|
|
"*=" => return Ok(Some(*x = multiply(*x, y)?.as_int().unwrap())),
|
|
"/=" => return Ok(Some(*x = divide(*x, y)?.as_int().unwrap())),
|
|
"%=" => return Ok(Some(*x = modulo(*x, y)?.as_int().unwrap())),
|
|
"~=" => return Ok(Some(*x = power(*x, y)?.as_int().unwrap())),
|
|
">>=" => return Ok(Some(*x = shift_right(*x, y)?.as_int().unwrap())),
|
|
"<<=" => return Ok(Some(*x = shift_left(*x, y)?.as_int().unwrap())),
|
|
_ => (),
|
|
}
|
|
} else {
|
|
match op {
|
|
"+=" => return Ok(Some(*x += y)),
|
|
"-=" => return Ok(Some(*x -= y)),
|
|
"*=" => return Ok(Some(*x *= y)),
|
|
"/=" => return Ok(Some(*x /= y)),
|
|
"%=" => return Ok(Some(*x %= y)),
|
|
"~=" => return Ok(Some(*x = x.pow(y as u32))),
|
|
">>=" => return Ok(Some(*x = *x >> y)),
|
|
"<<=" => return Ok(Some(*x = *x << y)),
|
|
_ => (),
|
|
}
|
|
}
|
|
|
|
match op {
|
|
"&=" => return Ok(Some(*x &= y)),
|
|
"|=" => return Ok(Some(*x |= y)),
|
|
"^=" => return Ok(Some(*x ^= y)),
|
|
_ => (),
|
|
}
|
|
} else if args_type == TypeId::of::<bool>() {
|
|
let y = y.clone().cast::<bool>();
|
|
let mut x = x.write_lock::<bool>().unwrap();
|
|
|
|
match op {
|
|
"&=" => return Ok(Some(*x = *x && y)),
|
|
"|=" => return Ok(Some(*x = *x || y)),
|
|
_ => (),
|
|
}
|
|
} else if args_type == TypeId::of::<ImmutableString>() {
|
|
let y = y.read_lock::<ImmutableString>().unwrap().deref().clone();
|
|
let mut x = x.write_lock::<ImmutableString>().unwrap();
|
|
|
|
match op {
|
|
"+=" => return Ok(Some(*x += y)),
|
|
_ => (),
|
|
}
|
|
}
|
|
|
|
#[cfg(not(feature = "no_float"))]
|
|
if args_type == TypeId::of::<FLOAT>() {
|
|
let y = y.clone().cast::<FLOAT>();
|
|
let mut x = x.write_lock::<FLOAT>().unwrap();
|
|
|
|
match op {
|
|
"+=" => return Ok(Some(*x += y)),
|
|
"-=" => return Ok(Some(*x -= y)),
|
|
"*=" => return Ok(Some(*x *= y)),
|
|
"/=" => return Ok(Some(*x /= y)),
|
|
"%=" => return Ok(Some(*x %= y)),
|
|
"~=" => return Ok(Some(*x = x.powf(y))),
|
|
_ => (),
|
|
}
|
|
}
|
|
|
|
Ok(None)
|
|
}
|