1516 lines
55 KiB
Rust
1516 lines
55 KiB
Rust
//! Implement function-calling mechanism for [`Engine`].
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use crate::ast::FnCallHashes;
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use crate::engine::{
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FnResolutionCacheEntry, Imports, State, KEYWORD_DEBUG, KEYWORD_EVAL, KEYWORD_FN_PTR,
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KEYWORD_FN_PTR_CALL, KEYWORD_FN_PTR_CURRY, KEYWORD_IS_DEF_VAR, KEYWORD_PRINT, KEYWORD_TYPE_OF,
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MAX_DYNAMIC_PARAMETERS,
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};
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use crate::fn_builtin::{get_builtin_binary_op_fn, get_builtin_op_assignment_fn};
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use crate::fn_native::{FnAny, FnCallArgs};
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use crate::module::NamespaceRef;
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use crate::optimize::OptimizationLevel;
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use crate::{
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ast::{Expr, Stmt},
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fn_native::CallableFunction,
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RhaiResult,
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};
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use crate::{
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calc_fn_hash, calc_fn_params_hash, combine_hashes, Dynamic, Engine, EvalAltResult, FnPtr,
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ImmutableString, Module, ParseErrorType, Position, Scope, StaticVec,
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};
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#[cfg(feature = "no_std")]
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use std::prelude::v1::*;
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use std::{
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any::{type_name, TypeId},
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convert::TryFrom,
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iter::{empty, once},
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mem,
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};
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#[cfg(not(feature = "no_object"))]
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use crate::Map;
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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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#[inline(always)]
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fn change_first_arg_to_copy(&mut self, args: &mut FnCallArgs<'a>) {
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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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#[inline(always)]
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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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#[inline(always)]
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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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"ArgBackup::restore_first_arg 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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#[cfg(not(feature = "no_closure"))]
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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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#[cfg(not(feature = "no_closure"))]
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if let Some((n, _)) = args
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.iter()
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.enumerate()
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.skip(if is_ref { 1 } else { 0 })
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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, 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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Ok(())
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}
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impl Engine {
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/// Generate the signature for a function call.
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#[inline]
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fn gen_call_signature(
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&self,
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namespace: Option<&NamespaceRef>,
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fn_name: &str,
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args: &[&mut Dynamic],
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) -> String {
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format!(
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"{}{} ({})",
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namespace.map_or(String::new(), |ns| ns.to_string()),
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fn_name,
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args.iter()
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.map(|a| if a.is::<ImmutableString>() {
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"&str | ImmutableString | String"
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} else {
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self.map_type_name((*a).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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}
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/// Resolve a function call.
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///
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/// Search order:
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/// 1) AST - script functions in the AST
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/// 2) Global namespace - functions registered via Engine::register_XXX
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/// 3) Global modules - packages
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/// 4) Imported modules - functions marked with global namespace
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/// 5) Global sub-modules - functions marked with global namespace
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#[inline(always)]
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fn resolve_function<'s>(
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&self,
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mods: &Imports,
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state: &'s mut State,
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lib: &[&Module],
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fn_name: &str,
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hash_script: u64,
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args: Option<&mut FnCallArgs>,
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allow_dynamic: bool,
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is_op_assignment: bool,
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) -> &'s Option<Box<FnResolutionCacheEntry>> {
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let mut hash = if let Some(ref args) = args {
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let hash_params = calc_fn_params_hash(args.iter().map(|a| a.type_id()));
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combine_hashes(hash_script, hash_params)
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} else {
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hash_script
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};
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&*state
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.fn_resolution_cache_mut()
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.entry(hash)
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.or_insert_with(|| {
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let num_args = args.as_ref().map_or(0, |a| a.len());
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let max_bitmask = if !allow_dynamic {
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0
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} else {
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1usize << num_args.min(MAX_DYNAMIC_PARAMETERS)
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};
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let mut bitmask = 1usize; // Bitmask of which parameter to replace with `Dynamic`
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loop {
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let func = lib
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.iter()
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.find_map(|m| {
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m.get_fn(hash).cloned().map(|func| {
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let source = m.id_raw().cloned();
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FnResolutionCacheEntry { func, source }
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})
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})
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.or_else(|| {
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self.global_namespace
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.get_fn(hash)
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.cloned()
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.map(|func| FnResolutionCacheEntry { func, source: None })
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})
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.or_else(|| {
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self.global_modules.iter().find_map(|m| {
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m.get_fn(hash).cloned().map(|func| {
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let source = m.id_raw().cloned();
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FnResolutionCacheEntry { func, source }
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})
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})
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})
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.or_else(|| {
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mods.get_fn(hash).map(|(func, source)| {
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let func = func.clone();
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let source = source.cloned();
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FnResolutionCacheEntry { func, source }
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})
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})
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.or_else(|| {
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self.global_sub_modules.values().find_map(|m| {
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m.get_qualified_fn(hash).cloned().map(|func| {
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let source = m.id_raw().cloned();
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FnResolutionCacheEntry { func, source }
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})
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})
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});
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match func {
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// Specific version found
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Some(f) => return Some(Box::new(f)),
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// Stop when all permutations are exhausted
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None if bitmask >= max_bitmask => {
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if num_args != 2 {
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return None;
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}
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return args.and_then(|args| {
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if !is_op_assignment {
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get_builtin_binary_op_fn(fn_name, &args[0], &args[1]).map(|f| {
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let func = CallableFunction::from_method(
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Box::new(f) as Box<FnAny>
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);
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FnResolutionCacheEntry { func, source: None }
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})
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} else {
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let (first, second) = args.split_first().unwrap();
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get_builtin_op_assignment_fn(fn_name, *first, second[0]).map(
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|f| {
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let func = CallableFunction::from_method(
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Box::new(f) as Box<FnAny>
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);
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FnResolutionCacheEntry { func, source: None }
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},
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)
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}
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.map(Box::new)
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});
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}
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// Try all permutations with `Dynamic` wildcards
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None => {
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let hash_params = calc_fn_params_hash(
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args.as_ref().unwrap().iter().enumerate().map(|(i, a)| {
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let mask = 1usize << (num_args - i - 1);
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if bitmask & mask != 0 {
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// Replace with `Dynamic`
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TypeId::of::<Dynamic>()
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} else {
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a.type_id()
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}
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}),
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);
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hash = combine_hashes(hash_script, hash_params);
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bitmask += 1;
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}
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}
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}
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})
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}
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/// Call a native Rust function registered with the [`Engine`].
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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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mods: &Imports,
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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_native: u64,
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args: &mut FnCallArgs,
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is_ref: bool,
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is_op_assignment: bool,
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pos: Position,
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) -> Result<(Dynamic, bool), Box<EvalAltResult>> {
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#[cfg(not(feature = "unchecked"))]
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self.inc_operations(state, pos)?;
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let state_source = state.source.clone();
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// Check if function access already in the cache
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let func = self.resolve_function(
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mods,
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state,
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lib,
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fn_name,
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hash_native,
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Some(args),
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true,
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is_op_assignment,
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);
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if let Some(f) = func {
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let FnResolutionCacheEntry { func, source } = f.as_ref();
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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: Option<ArgBackup> = None;
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if is_ref && func.is_pure() && !args.is_empty() {
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backup = Some(Default::default());
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backup.as_mut().unwrap().change_first_arg_to_copy(args);
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}
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// Run external function
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let source = source
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.as_ref()
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.or_else(|| state_source.as_ref())
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.map(|s| s.as_str());
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let result = if func.is_plugin_fn() {
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func.get_plugin_fn()
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.call((self, fn_name, source, mods, lib).into(), args)
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} else {
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func.get_native_fn()((self, fn_name, source, mods, lib).into(), args)
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};
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// Restore the original reference
|
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if let Some(backup) = backup {
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backup.restore_first_arg(args);
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}
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let result = result.map_err(|err| err.fill_position(pos))?;
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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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let text = result.take_immutable_string().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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pos,
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)
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})?;
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((self.print)(&text).into(), false)
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}
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KEYWORD_DEBUG => {
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let text = result.take_immutable_string().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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pos,
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)
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})?;
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let source = state.source.as_ref().map(|s| s.as_str());
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((self.debug)(&text, source, pos).into(), 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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|
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match fn_name {
|
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// index getter function not found?
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#[cfg(not(feature = "no_index"))]
|
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crate::engine::FN_IDX_GET => {
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assert!(args.len() == 2);
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|
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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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pos,
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)
|
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.into()
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}
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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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crate::engine::FN_IDX_SET => {
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assert!(args.len() == 3);
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|
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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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pos,
|
|
)
|
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.into()
|
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}
|
|
|
|
// Getter function not found?
|
|
#[cfg(not(feature = "no_object"))]
|
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_ if fn_name.starts_with(crate::engine::FN_GET) => {
|
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assert!(args.len() == 1);
|
|
|
|
EvalAltResult::ErrorDotExpr(
|
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format!(
|
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"Unknown property '{}' - a getter is not registered for type '{}'",
|
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&fn_name[crate::engine::FN_GET.len()..],
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self.map_type_name(args[0].type_name())
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),
|
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pos,
|
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)
|
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.into()
|
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}
|
|
|
|
// Setter function not found?
|
|
#[cfg(not(feature = "no_object"))]
|
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_ if fn_name.starts_with(crate::engine::FN_SET) => {
|
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assert!(args.len() == 2);
|
|
|
|
EvalAltResult::ErrorDotExpr(
|
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format!(
|
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"No writable property '{}' - a setter is not registered for type '{}' to handle '{}'",
|
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&fn_name[crate::engine::FN_SET.len()..],
|
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self.map_type_name(args[0].type_name()),
|
|
self.map_type_name(args[1].type_name()),
|
|
),
|
|
pos,
|
|
)
|
|
.into()
|
|
}
|
|
|
|
// Raise error
|
|
_ => EvalAltResult::ErrorFunctionNotFound(
|
|
self.gen_call_signature(None, fn_name, args.as_ref()),
|
|
pos,
|
|
)
|
|
.into(),
|
|
}
|
|
}
|
|
|
|
/// Call a script-defined function.
|
|
///
|
|
/// # 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 `()`!
|
|
#[cfg(not(feature = "no_function"))]
|
|
pub(crate) fn call_script_fn(
|
|
&self,
|
|
scope: &mut Scope,
|
|
mods: &mut Imports,
|
|
state: &mut State,
|
|
lib: &[&Module],
|
|
this_ptr: &mut Option<&mut Dynamic>,
|
|
fn_def: &crate::ast::ScriptFnDef,
|
|
args: &mut FnCallArgs,
|
|
pos: Position,
|
|
level: usize,
|
|
) -> RhaiResult {
|
|
#[inline(always)]
|
|
fn make_error(
|
|
name: String,
|
|
fn_def: &crate::ast::ScriptFnDef,
|
|
state: &State,
|
|
err: Box<EvalAltResult>,
|
|
pos: Position,
|
|
) -> RhaiResult {
|
|
EvalAltResult::ErrorInFunctionCall(
|
|
name,
|
|
fn_def
|
|
.lib
|
|
.as_ref()
|
|
.and_then(|m| m.id().map(|id| id.to_string()))
|
|
.or_else(|| state.source.as_ref().map(|s| s.to_string()))
|
|
.unwrap_or_default(),
|
|
err,
|
|
pos,
|
|
)
|
|
.into()
|
|
}
|
|
|
|
#[cfg(not(feature = "unchecked"))]
|
|
self.inc_operations(state, pos)?;
|
|
|
|
if fn_def.body.is_empty() {
|
|
return Ok(Dynamic::UNIT);
|
|
}
|
|
|
|
// Check for stack overflow
|
|
#[cfg(not(feature = "no_function"))]
|
|
#[cfg(not(feature = "unchecked"))]
|
|
if level > self.max_call_levels() {
|
|
return EvalAltResult::ErrorStackOverflow(pos).into();
|
|
}
|
|
|
|
let orig_scope_level = state.scope_level;
|
|
state.scope_level += 1;
|
|
|
|
let prev_scope_len = scope.len();
|
|
let prev_mods_len = mods.len();
|
|
|
|
// Put arguments into scope as variables
|
|
// Actually consume the arguments instead of cloning them
|
|
scope.extend(
|
|
fn_def
|
|
.params
|
|
.iter()
|
|
.zip(args.iter_mut().map(|v| mem::take(*v)))
|
|
.map(|(name, value)| {
|
|
let var_name: std::borrow::Cow<'_, str> =
|
|
crate::r#unsafe::unsafe_cast_var_name_to_lifetime(name).into();
|
|
(var_name, value)
|
|
}),
|
|
);
|
|
|
|
// Merge in encapsulated environment, if any
|
|
let lib_merged;
|
|
|
|
let (unified_lib, unified) = if let Some(ref env_lib) = fn_def.lib {
|
|
state.push_fn_resolution_cache();
|
|
lib_merged = once(env_lib.as_ref())
|
|
.chain(lib.iter().cloned())
|
|
.collect::<StaticVec<_>>();
|
|
(lib_merged.as_ref(), true)
|
|
} else {
|
|
(lib, false)
|
|
};
|
|
|
|
#[cfg(not(feature = "no_module"))]
|
|
if !fn_def.mods.is_empty() {
|
|
fn_def
|
|
.mods
|
|
.iter_raw()
|
|
.for_each(|(n, m)| mods.push(n.clone(), m.clone()));
|
|
}
|
|
|
|
// Evaluate the function
|
|
let body = &fn_def.body;
|
|
|
|
let result = self
|
|
.eval_stmt_block(scope, mods, state, unified_lib, this_ptr, body, true, level)
|
|
.or_else(|err| match *err {
|
|
// Convert return statement to return value
|
|
EvalAltResult::Return(x, _) => Ok(x),
|
|
// Error in sub function call
|
|
EvalAltResult::ErrorInFunctionCall(name, src, err, _) => {
|
|
let fn_name = if src.is_empty() {
|
|
format!("{} < {}", name, fn_def.name)
|
|
} else {
|
|
format!("{} @ '{}' < {}", name, src, fn_def.name)
|
|
};
|
|
|
|
make_error(fn_name, fn_def, state, err, pos)
|
|
}
|
|
// System errors are passed straight-through
|
|
mut err if err.is_system_exception() => {
|
|
err.set_position(pos);
|
|
err.into()
|
|
}
|
|
// Other errors are wrapped in `ErrorInFunctionCall`
|
|
_ => make_error(fn_def.name.to_string(), fn_def, state, err, pos),
|
|
});
|
|
|
|
// Remove all local variables
|
|
scope.rewind(prev_scope_len);
|
|
mods.truncate(prev_mods_len);
|
|
state.scope_level = orig_scope_level;
|
|
|
|
if unified {
|
|
state.pop_fn_resolution_cache();
|
|
}
|
|
|
|
result
|
|
}
|
|
|
|
// Does a scripted function exist?
|
|
#[cfg(not(feature = "no_function"))]
|
|
#[inline(always)]
|
|
pub(crate) fn has_script_fn(
|
|
&self,
|
|
mods: Option<&Imports>,
|
|
state: &mut State,
|
|
lib: &[&Module],
|
|
hash_script: u64,
|
|
) -> bool {
|
|
let cache = state.fn_resolution_cache_mut();
|
|
|
|
if let Some(result) = cache.get(&hash_script).map(|v| v.is_some()) {
|
|
return result;
|
|
}
|
|
|
|
// First check script-defined functions
|
|
let result = lib.iter().any(|&m| m.contains_fn(hash_script))
|
|
// Then check registered functions
|
|
|| self.global_namespace.contains_fn(hash_script)
|
|
// Then check packages
|
|
|| self.global_modules.iter().any(|m| m.contains_fn(hash_script))
|
|
// Then check imported modules
|
|
|| mods.map_or(false, |m| m.contains_fn(hash_script))
|
|
// Then check sub-modules
|
|
|| self.global_sub_modules.values().any(|m| m.contains_qualified_fn(hash_script));
|
|
|
|
if !result {
|
|
cache.insert(hash_script, None);
|
|
}
|
|
|
|
result
|
|
}
|
|
|
|
/// Perform an actual function call, native Rust or scripted, taking care of special functions.
|
|
///
|
|
/// # 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(
|
|
&self,
|
|
mods: &mut Imports,
|
|
state: &mut State,
|
|
lib: &[&Module],
|
|
fn_name: &str,
|
|
hash: FnCallHashes,
|
|
args: &mut FnCallArgs,
|
|
is_ref: bool,
|
|
_is_method: bool,
|
|
pos: Position,
|
|
_capture_scope: Option<Scope>,
|
|
_level: usize,
|
|
) -> Result<(Dynamic, bool), Box<EvalAltResult>> {
|
|
// Check for data race.
|
|
#[cfg(not(feature = "no_closure"))]
|
|
ensure_no_data_race(fn_name, args, is_ref)?;
|
|
|
|
// These may be redirected from method style calls.
|
|
match fn_name {
|
|
// Handle type_of()
|
|
KEYWORD_TYPE_OF if args.len() == 1 => {
|
|
return Ok((
|
|
self.map_type_name(args[0].type_name()).to_string().into(),
|
|
false,
|
|
));
|
|
}
|
|
|
|
// Handle is_def_fn()
|
|
#[cfg(not(feature = "no_function"))]
|
|
crate::engine::KEYWORD_IS_DEF_FN
|
|
if args.len() == 2 && args[0].is::<FnPtr>() && args[1].is::<crate::INT>() =>
|
|
{
|
|
let fn_name = &*args[0].read_lock::<ImmutableString>().unwrap();
|
|
let num_params = args[1].as_int().unwrap();
|
|
|
|
return Ok((
|
|
if num_params < 0 {
|
|
Dynamic::FALSE
|
|
} else {
|
|
let hash_script = calc_fn_hash(empty(), fn_name, num_params as usize);
|
|
self.has_script_fn(Some(mods), state, lib, hash_script)
|
|
.into()
|
|
},
|
|
false,
|
|
));
|
|
}
|
|
|
|
// Handle is_shared()
|
|
#[cfg(not(feature = "no_closure"))]
|
|
crate::engine::KEYWORD_IS_SHARED if args.len() == 1 => {
|
|
return EvalAltResult::ErrorRuntime(
|
|
format!(
|
|
"'{}' should not be called this way. Try {}(...);",
|
|
fn_name, fn_name
|
|
)
|
|
.into(),
|
|
pos,
|
|
)
|
|
.into()
|
|
}
|
|
|
|
KEYWORD_FN_PTR | KEYWORD_EVAL | KEYWORD_IS_DEF_VAR if args.len() == 1 => {
|
|
return EvalAltResult::ErrorRuntime(
|
|
format!(
|
|
"'{}' should not be called this way. Try {}(...);",
|
|
fn_name, fn_name
|
|
)
|
|
.into(),
|
|
pos,
|
|
)
|
|
.into()
|
|
}
|
|
|
|
KEYWORD_FN_PTR_CALL | KEYWORD_FN_PTR_CURRY if !args.is_empty() => {
|
|
return EvalAltResult::ErrorRuntime(
|
|
format!(
|
|
"'{}' should not be called this way. Try {}(...);",
|
|
fn_name, fn_name
|
|
)
|
|
.into(),
|
|
pos,
|
|
)
|
|
.into()
|
|
}
|
|
|
|
_ => (),
|
|
}
|
|
|
|
// Scripted function call?
|
|
#[cfg(not(feature = "no_function"))]
|
|
let hash_script = if hash.is_native_only() {
|
|
None
|
|
} else {
|
|
Some(hash.script_hash())
|
|
};
|
|
|
|
#[cfg(not(feature = "no_function"))]
|
|
if let Some(f) = hash_script.and_then(|hash| {
|
|
self.resolve_function(mods, state, lib, fn_name, hash, None, false, false)
|
|
.clone()
|
|
}) {
|
|
let FnResolutionCacheEntry { func, source } = *f;
|
|
// Script function call
|
|
assert!(func.is_script());
|
|
|
|
let func = func.get_fn_def();
|
|
|
|
if func.body.is_empty() {
|
|
return Ok((Dynamic::UNIT, false));
|
|
}
|
|
|
|
let scope: &mut Scope = &mut Default::default();
|
|
|
|
// Move captured variables into scope
|
|
#[cfg(not(feature = "no_closure"))]
|
|
if let Some(captured) = _capture_scope {
|
|
if !func.externals.is_empty() {
|
|
captured
|
|
.into_iter()
|
|
.filter(|(name, _, _)| func.externals.contains(name.as_ref()))
|
|
.for_each(|(name, value, _)| {
|
|
// Consume the scope values.
|
|
scope.push_dynamic(name, value);
|
|
});
|
|
}
|
|
}
|
|
|
|
let result = if _is_method {
|
|
// Method call of script function - map first argument to `this`
|
|
let (first, rest) = args.split_first_mut().unwrap();
|
|
|
|
let orig_source = state.source.take();
|
|
state.source = source;
|
|
|
|
let level = _level + 1;
|
|
|
|
let result = self.call_script_fn(
|
|
scope,
|
|
mods,
|
|
state,
|
|
lib,
|
|
&mut Some(*first),
|
|
func,
|
|
rest,
|
|
pos,
|
|
level,
|
|
);
|
|
|
|
// Restore the original source
|
|
state.source = orig_source;
|
|
|
|
result?
|
|
} else {
|
|
// Normal call of script function
|
|
// The first argument is a reference?
|
|
let mut backup: Option<ArgBackup> = None;
|
|
if is_ref && !args.is_empty() {
|
|
backup = Some(Default::default());
|
|
backup.as_mut().unwrap().change_first_arg_to_copy(args);
|
|
}
|
|
|
|
let orig_source = state.source.take();
|
|
state.source = source;
|
|
|
|
let level = _level + 1;
|
|
|
|
let result =
|
|
self.call_script_fn(scope, mods, state, lib, &mut None, func, args, pos, level);
|
|
|
|
// Restore the original source
|
|
state.source = orig_source;
|
|
|
|
// Restore the original reference
|
|
if let Some(backup) = backup {
|
|
backup.restore_first_arg(args);
|
|
}
|
|
|
|
result?
|
|
};
|
|
|
|
return Ok((result, false));
|
|
}
|
|
|
|
// Native function call
|
|
self.call_native_fn(
|
|
mods,
|
|
state,
|
|
lib,
|
|
fn_name,
|
|
hash.native_hash(),
|
|
args,
|
|
is_ref,
|
|
false,
|
|
pos,
|
|
)
|
|
}
|
|
|
|
/// Evaluate a list of statements with no `this` pointer.
|
|
/// This is commonly used to evaluate a list of statements in an [`AST`] or a script function body.
|
|
#[inline(always)]
|
|
pub(crate) fn eval_global_statements(
|
|
&self,
|
|
scope: &mut Scope,
|
|
mods: &mut Imports,
|
|
state: &mut State,
|
|
statements: &[Stmt],
|
|
lib: &[&Module],
|
|
level: usize,
|
|
) -> RhaiResult {
|
|
self.eval_stmt_block(scope, mods, state, lib, &mut None, statements, false, level)
|
|
.or_else(|err| match *err {
|
|
EvalAltResult::Return(out, _) => Ok(out),
|
|
EvalAltResult::LoopBreak(_, _) => {
|
|
unreachable!("no outer loop scope to break out of")
|
|
}
|
|
_ => Err(err),
|
|
})
|
|
}
|
|
|
|
/// Evaluate a text script in place - used primarily for 'eval'.
|
|
fn eval_script_expr_in_place(
|
|
&self,
|
|
scope: &mut Scope,
|
|
mods: &mut Imports,
|
|
state: &mut State,
|
|
lib: &[&Module],
|
|
script: &str,
|
|
_pos: Position,
|
|
level: usize,
|
|
) -> RhaiResult {
|
|
#[cfg(not(feature = "unchecked"))]
|
|
self.inc_operations(state, _pos)?;
|
|
|
|
let script = script.trim();
|
|
if script.is_empty() {
|
|
return Ok(Dynamic::UNIT);
|
|
}
|
|
|
|
// Compile the script text
|
|
// No optimizations because we only run it once
|
|
let ast = self.compile_with_scope_and_optimization_level(
|
|
&Default::default(),
|
|
&[script],
|
|
OptimizationLevel::None,
|
|
)?;
|
|
|
|
// If new functions are defined within the eval string, it is an error
|
|
if ast.lib().count().0 != 0 {
|
|
return Err(ParseErrorType::WrongFnDefinition.into());
|
|
}
|
|
|
|
let statements = ast.statements();
|
|
if statements.is_empty() {
|
|
return Ok(Dynamic::UNIT);
|
|
}
|
|
|
|
// Evaluate the AST
|
|
let mut new_state: State = Default::default();
|
|
new_state.source = state.source.clone();
|
|
new_state.operations = state.operations;
|
|
|
|
let result =
|
|
self.eval_global_statements(scope, mods, &mut new_state, statements, lib, level);
|
|
|
|
state.operations = new_state.operations;
|
|
|
|
result
|
|
}
|
|
|
|
/// Call a dot method.
|
|
#[cfg(not(feature = "no_object"))]
|
|
pub(crate) fn make_method_call(
|
|
&self,
|
|
mods: &mut Imports,
|
|
state: &mut State,
|
|
lib: &[&Module],
|
|
fn_name: &str,
|
|
mut hash: FnCallHashes,
|
|
target: &mut crate::engine::Target,
|
|
(call_args, call_arg_positions): &mut (StaticVec<Dynamic>, StaticVec<Position>),
|
|
pos: Position,
|
|
level: usize,
|
|
) -> Result<(Dynamic, bool), Box<EvalAltResult>> {
|
|
let is_ref = target.is_ref();
|
|
|
|
// Get a reference to the mutation target Dynamic
|
|
let obj = target.as_mut();
|
|
let mut fn_name = fn_name;
|
|
|
|
let (result, updated) = match fn_name {
|
|
KEYWORD_FN_PTR_CALL if obj.is::<FnPtr>() => {
|
|
// FnPtr call
|
|
let fn_ptr = obj.read_lock::<FnPtr>().unwrap();
|
|
// Redirect function name
|
|
let fn_name = fn_ptr.fn_name();
|
|
let args_len = call_args.len() + fn_ptr.curry().len();
|
|
// Recalculate hashes
|
|
let new_hash = FnCallHashes::from_script(calc_fn_hash(empty(), fn_name, args_len));
|
|
// Arguments are passed as-is, adding the curried arguments
|
|
let mut curry = fn_ptr.curry().iter().cloned().collect::<StaticVec<_>>();
|
|
let mut args = curry
|
|
.iter_mut()
|
|
.chain(call_args.iter_mut())
|
|
.collect::<StaticVec<_>>();
|
|
|
|
// Map it to name(args) in function-call style
|
|
self.exec_fn_call(
|
|
mods, state, lib, fn_name, new_hash, &mut args, false, false, pos, None, level,
|
|
)
|
|
}
|
|
KEYWORD_FN_PTR_CALL => {
|
|
if call_args.len() > 0 {
|
|
if !call_args[0].is::<FnPtr>() {
|
|
return Err(self.make_type_mismatch_err::<FnPtr>(
|
|
self.map_type_name(obj.type_name()),
|
|
call_arg_positions[0],
|
|
));
|
|
}
|
|
} else {
|
|
return Err(self.make_type_mismatch_err::<FnPtr>(
|
|
self.map_type_name(obj.type_name()),
|
|
pos,
|
|
));
|
|
}
|
|
|
|
// FnPtr call on object
|
|
let fn_ptr = call_args.remove(0).cast::<FnPtr>();
|
|
call_arg_positions.remove(0);
|
|
// Redirect function name
|
|
let fn_name = fn_ptr.fn_name();
|
|
let args_len = call_args.len() + fn_ptr.curry().len();
|
|
// Recalculate hash
|
|
let new_hash = FnCallHashes::from_script_and_native(
|
|
calc_fn_hash(empty(), fn_name, args_len),
|
|
calc_fn_hash(empty(), fn_name, args_len + 1),
|
|
);
|
|
// Replace the first argument with the object pointer, adding the curried arguments
|
|
let mut curry = fn_ptr.curry().iter().cloned().collect::<StaticVec<_>>();
|
|
let mut args = once(obj)
|
|
.chain(curry.iter_mut())
|
|
.chain(call_args.iter_mut())
|
|
.collect::<StaticVec<_>>();
|
|
|
|
// Map it to name(args) in function-call style
|
|
self.exec_fn_call(
|
|
mods, state, lib, fn_name, new_hash, &mut args, is_ref, true, pos, None, level,
|
|
)
|
|
}
|
|
KEYWORD_FN_PTR_CURRY => {
|
|
if !obj.is::<FnPtr>() {
|
|
return Err(self.make_type_mismatch_err::<FnPtr>(
|
|
self.map_type_name(obj.type_name()),
|
|
pos,
|
|
));
|
|
}
|
|
|
|
let fn_ptr = obj.read_lock::<FnPtr>().unwrap();
|
|
|
|
// Curry call
|
|
Ok((
|
|
if call_args.is_empty() {
|
|
fn_ptr.clone()
|
|
} else {
|
|
FnPtr::new_unchecked(
|
|
fn_ptr.get_fn_name().clone(),
|
|
fn_ptr
|
|
.curry()
|
|
.iter()
|
|
.cloned()
|
|
.chain(call_args.iter_mut().map(|v| mem::take(v)))
|
|
.collect(),
|
|
)
|
|
}
|
|
.into(),
|
|
false,
|
|
))
|
|
}
|
|
|
|
// Handle is_shared()
|
|
#[cfg(not(feature = "no_closure"))]
|
|
crate::engine::KEYWORD_IS_SHARED if call_args.is_empty() => {
|
|
return Ok((target.is_shared().into(), false));
|
|
}
|
|
|
|
_ => {
|
|
let _redirected;
|
|
|
|
// 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
|
|
fn_ptr
|
|
.curry()
|
|
.iter()
|
|
.cloned()
|
|
.enumerate()
|
|
.for_each(|(i, v)| {
|
|
call_args.insert(i, v);
|
|
call_arg_positions.insert(i, Position::NONE);
|
|
});
|
|
// Recalculate the hash based on the new function name and new arguments
|
|
hash = FnCallHashes::from_script_and_native(
|
|
calc_fn_hash(empty(), fn_name, call_args.len()),
|
|
calc_fn_hash(empty(), fn_name, call_args.len() + 1),
|
|
);
|
|
}
|
|
}
|
|
};
|
|
|
|
// Attached object pointer in front of the arguments
|
|
let mut args = once(obj)
|
|
.chain(call_args.iter_mut())
|
|
.collect::<StaticVec<_>>();
|
|
|
|
self.exec_fn_call(
|
|
mods, state, lib, fn_name, hash, &mut args, is_ref, true, pos, None, level,
|
|
)
|
|
}
|
|
}?;
|
|
|
|
// Propagate the changed value back to the source if necessary
|
|
if updated {
|
|
target.propagate_changed_value();
|
|
}
|
|
|
|
Ok((result, updated))
|
|
}
|
|
|
|
/// Call a function in normal function-call style.
|
|
pub(crate) fn make_function_call(
|
|
&self,
|
|
scope: &mut Scope,
|
|
mods: &mut Imports,
|
|
state: &mut State,
|
|
lib: &[&Module],
|
|
this_ptr: &mut Option<&mut Dynamic>,
|
|
fn_name: &str,
|
|
args_expr: &[Expr],
|
|
literal_args: &[(Dynamic, Position)],
|
|
mut hashes: FnCallHashes,
|
|
pos: Position,
|
|
capture_scope: bool,
|
|
level: usize,
|
|
) -> RhaiResult {
|
|
// Handle call() - Redirect function call
|
|
let redirected;
|
|
let mut args_expr = args_expr;
|
|
let mut literal_args = literal_args;
|
|
let mut total_args = args_expr.len() + literal_args.len();
|
|
let mut curry = StaticVec::new();
|
|
let mut name = fn_name;
|
|
|
|
match name {
|
|
// Handle call()
|
|
KEYWORD_FN_PTR_CALL if total_args >= 1 => {
|
|
let (arg, arg_pos) = args_expr.get(0).map_or_else(
|
|
|| Ok(literal_args[0].clone()),
|
|
|arg| {
|
|
self.eval_expr(scope, mods, state, lib, this_ptr, arg, level)
|
|
.map(|v| (v, arg.position()))
|
|
},
|
|
)?;
|
|
|
|
if !arg.is::<FnPtr>() {
|
|
return Err(self.make_type_mismatch_err::<FnPtr>(
|
|
self.map_type_name(arg.type_name()),
|
|
arg_pos,
|
|
));
|
|
}
|
|
|
|
let fn_ptr = arg.cast::<FnPtr>();
|
|
curry.extend(fn_ptr.curry().iter().cloned());
|
|
|
|
// Redirect function name
|
|
redirected = fn_ptr.take_data().0;
|
|
name = &redirected;
|
|
|
|
// Skip the first argument
|
|
if !args_expr.is_empty() {
|
|
args_expr = &args_expr[1..];
|
|
} else {
|
|
literal_args = &literal_args[1..];
|
|
}
|
|
total_args -= 1;
|
|
|
|
// Recalculate hash
|
|
let args_len = total_args + curry.len();
|
|
hashes = if !hashes.is_native_only() {
|
|
FnCallHashes::from_script(calc_fn_hash(empty(), name, args_len))
|
|
} else {
|
|
FnCallHashes::from_native(calc_fn_hash(empty(), name, args_len))
|
|
};
|
|
}
|
|
// Handle Fn()
|
|
KEYWORD_FN_PTR if total_args == 1 => {
|
|
let (arg, arg_pos) = args_expr.get(0).map_or_else(
|
|
|| Ok(literal_args[0].clone()),
|
|
|arg| {
|
|
self.eval_expr(scope, mods, state, lib, this_ptr, arg, level)
|
|
.map(|v| (v, arg.position()))
|
|
},
|
|
)?;
|
|
|
|
// Fn - only in function call style
|
|
return arg
|
|
.take_immutable_string()
|
|
.map_err(|typ| self.make_type_mismatch_err::<ImmutableString>(typ, arg_pos))
|
|
.and_then(|s| FnPtr::try_from(s))
|
|
.map(Into::<Dynamic>::into)
|
|
.map_err(|err| err.fill_position(arg_pos));
|
|
}
|
|
|
|
// Handle curry()
|
|
KEYWORD_FN_PTR_CURRY if total_args > 1 => {
|
|
let (arg, arg_pos) = args_expr.get(0).map_or_else(
|
|
|| Ok(literal_args[0].clone()),
|
|
|arg| {
|
|
self.eval_expr(scope, mods, state, lib, this_ptr, arg, level)
|
|
.map(|v| (v, arg.position()))
|
|
},
|
|
)?;
|
|
|
|
if !arg.is::<FnPtr>() {
|
|
return Err(self.make_type_mismatch_err::<FnPtr>(
|
|
self.map_type_name(arg.type_name()),
|
|
arg_pos,
|
|
));
|
|
}
|
|
|
|
let (name, mut fn_curry) = arg.cast::<FnPtr>().take_data();
|
|
|
|
// Append the new curried arguments to the existing list.
|
|
if !args_expr.is_empty() {
|
|
args_expr.iter().skip(1).try_for_each(|expr| {
|
|
self.eval_expr(scope, mods, state, lib, this_ptr, expr, level)
|
|
.map(|value| fn_curry.push(value))
|
|
})?;
|
|
fn_curry.extend(literal_args.iter().map(|(v, _)| v.clone()));
|
|
} else {
|
|
fn_curry.extend(literal_args.iter().skip(1).map(|(v, _)| v.clone()));
|
|
}
|
|
|
|
return Ok(FnPtr::new_unchecked(name, fn_curry).into());
|
|
}
|
|
|
|
// Handle is_shared()
|
|
#[cfg(not(feature = "no_closure"))]
|
|
crate::engine::KEYWORD_IS_SHARED if total_args == 1 => {
|
|
let arg = args_expr.get(0).map_or_else(
|
|
|| Ok(literal_args[0].0.clone()),
|
|
|arg| self.eval_expr(scope, mods, state, lib, this_ptr, arg, level),
|
|
)?;
|
|
return Ok(arg.is_shared().into());
|
|
}
|
|
|
|
// Handle is_def_fn()
|
|
#[cfg(not(feature = "no_function"))]
|
|
crate::engine::KEYWORD_IS_DEF_FN if total_args == 2 => {
|
|
let (arg, arg_pos) = if !args_expr.is_empty() {
|
|
(
|
|
self.eval_expr(scope, mods, state, lib, this_ptr, &args_expr[0], level)?,
|
|
args_expr[0].position(),
|
|
)
|
|
} else {
|
|
literal_args[0].clone()
|
|
};
|
|
|
|
let fn_name = arg
|
|
.take_immutable_string()
|
|
.map_err(|err| self.make_type_mismatch_err::<ImmutableString>(err, arg_pos))?;
|
|
|
|
let (arg, arg_pos) = if args_expr.len() > 1 {
|
|
(
|
|
self.eval_expr(scope, mods, state, lib, this_ptr, &args_expr[1], level)?,
|
|
args_expr[1].position(),
|
|
)
|
|
} else {
|
|
literal_args[if args_expr.is_empty() { 1 } else { 0 }].clone()
|
|
};
|
|
|
|
let num_params = arg
|
|
.as_int()
|
|
.map_err(|err| self.make_type_mismatch_err::<crate::INT>(err, arg_pos))?;
|
|
|
|
return Ok(if num_params < 0 {
|
|
Dynamic::FALSE
|
|
} else {
|
|
let hash_script = calc_fn_hash(empty(), &fn_name, num_params as usize);
|
|
self.has_script_fn(Some(mods), state, lib, hash_script)
|
|
.into()
|
|
});
|
|
}
|
|
|
|
// Handle is_def_var()
|
|
KEYWORD_IS_DEF_VAR if total_args == 1 => {
|
|
let (arg, arg_pos) = args_expr.get(0).map_or_else(
|
|
|| Ok(literal_args[0].clone()),
|
|
|arg| {
|
|
self.eval_expr(scope, mods, state, lib, this_ptr, arg, level)
|
|
.map(|v| (v, arg.position()))
|
|
},
|
|
)?;
|
|
let var_name = arg
|
|
.take_immutable_string()
|
|
.map_err(|err| self.make_type_mismatch_err::<ImmutableString>(err, arg_pos))?;
|
|
return Ok(scope.contains(&var_name).into());
|
|
}
|
|
|
|
// Handle eval()
|
|
KEYWORD_EVAL if total_args == 1 => {
|
|
// eval - only in function call style
|
|
let prev_len = scope.len();
|
|
let (script, script_pos) = args_expr.get(0).map_or_else(
|
|
|| Ok(literal_args[0].clone()),
|
|
|script_expr| {
|
|
self.eval_expr(scope, mods, state, lib, this_ptr, script_expr, level)
|
|
.map(|v| (v, script_expr.position()))
|
|
},
|
|
)?;
|
|
let script = script.take_immutable_string().map_err(|typ| {
|
|
self.make_type_mismatch_err::<ImmutableString>(typ, script_pos)
|
|
})?;
|
|
let result = self.eval_script_expr_in_place(
|
|
scope,
|
|
mods,
|
|
state,
|
|
lib,
|
|
&script,
|
|
script_pos,
|
|
level + 1,
|
|
);
|
|
|
|
// 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.map_err(|err| {
|
|
Box::new(EvalAltResult::ErrorInFunctionCall(
|
|
KEYWORD_EVAL.to_string(),
|
|
state
|
|
.source
|
|
.as_ref()
|
|
.map(|s| s.to_string())
|
|
.unwrap_or_default(),
|
|
err,
|
|
pos,
|
|
))
|
|
});
|
|
}
|
|
|
|
_ => (),
|
|
}
|
|
|
|
// 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 capture_scope && !scope.is_empty() {
|
|
Some(scope.clone_visible())
|
|
} else {
|
|
None
|
|
};
|
|
|
|
if args_expr.is_empty() && literal_args.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
|
|
if curry.is_empty() && !args_expr.is_empty() && args_expr[0].is_variable_access(false) {
|
|
// func(x, ...) -> x.func(...)
|
|
arg_values = args_expr
|
|
.iter()
|
|
.skip(1)
|
|
.map(|expr| {
|
|
self.eval_expr(scope, mods, state, lib, this_ptr, expr, level)
|
|
.map(Dynamic::flatten)
|
|
})
|
|
.chain(literal_args.iter().map(|(v, _)| Ok(v.clone())))
|
|
.collect::<Result<_, _>>()?;
|
|
|
|
let (mut target, _pos) =
|
|
self.search_namespace(scope, mods, state, lib, this_ptr, &args_expr[0])?;
|
|
|
|
if target.as_ref().is_read_only() {
|
|
target = target.into_owned();
|
|
}
|
|
|
|
#[cfg(not(feature = "unchecked"))]
|
|
self.inc_operations(state, _pos)?;
|
|
|
|
#[cfg(not(feature = "no_closure"))]
|
|
let target_is_shared = target.is_shared();
|
|
#[cfg(feature = "no_closure")]
|
|
let target_is_shared = false;
|
|
|
|
args = if target_is_shared || target.is_value() {
|
|
arg_values.insert(0, target.take_or_clone().flatten());
|
|
arg_values.iter_mut().collect()
|
|
} else {
|
|
// Turn it into a method call only if the object is not shared and not a simple value
|
|
is_ref = true;
|
|
once(target.take_ref().unwrap())
|
|
.chain(arg_values.iter_mut())
|
|
.collect()
|
|
};
|
|
} else {
|
|
// func(..., ...)
|
|
arg_values = args_expr
|
|
.iter()
|
|
.map(|expr| {
|
|
self.eval_expr(scope, mods, state, lib, this_ptr, expr, level)
|
|
.map(Dynamic::flatten)
|
|
})
|
|
.chain(literal_args.iter().map(|(v, _)| Ok(v.clone())))
|
|
.collect::<Result<_, _>>()?;
|
|
|
|
args = curry.iter_mut().chain(arg_values.iter_mut()).collect();
|
|
}
|
|
}
|
|
|
|
self.exec_fn_call(
|
|
mods, state, lib, name, hashes, &mut args, is_ref, false, pos, capture, level,
|
|
)
|
|
.map(|(v, _)| v)
|
|
}
|
|
|
|
/// Call a namespace-qualified function in normal function-call style.
|
|
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>,
|
|
namespace: Option<&NamespaceRef>,
|
|
fn_name: &str,
|
|
args_expr: &[Expr],
|
|
literal_args: &[(Dynamic, Position)],
|
|
hash: u64,
|
|
pos: Position,
|
|
level: usize,
|
|
) -> RhaiResult {
|
|
let namespace = namespace.unwrap();
|
|
let mut arg_values: StaticVec<_>;
|
|
let mut first_arg_value = None;
|
|
let mut args: StaticVec<_>;
|
|
|
|
if args_expr.is_empty() && literal_args.is_empty() {
|
|
// No arguments
|
|
args = Default::default();
|
|
} else {
|
|
// See if the first argument is a variable (not namespace-qualified).
|
|
// If so, convert to method-call style in order to leverage potential
|
|
// &mut first argument and avoid cloning the value
|
|
if !args_expr.is_empty() && args_expr[0].is_variable_access(true) {
|
|
// func(x, ...) -> x.func(...)
|
|
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)
|
|
.map(Dynamic::flatten)
|
|
}
|
|
})
|
|
.chain(literal_args.iter().map(|(v, _)| Ok(v.clone())))
|
|
.collect::<Result<_, _>>()?;
|
|
|
|
// Get target reference to first argument
|
|
let (target, _pos) =
|
|
self.search_scope_only(scope, mods, state, lib, this_ptr, &args_expr[0])?;
|
|
|
|
#[cfg(not(feature = "unchecked"))]
|
|
self.inc_operations(state, _pos)?;
|
|
|
|
#[cfg(not(feature = "no_closure"))]
|
|
let target_is_shared = target.is_shared();
|
|
#[cfg(feature = "no_closure")]
|
|
let target_is_shared = false;
|
|
|
|
if target_is_shared || target.is_value() {
|
|
arg_values[0] = target.take_or_clone().flatten();
|
|
args = arg_values.iter_mut().collect();
|
|
} else {
|
|
let (first, rest) = arg_values.split_first_mut().unwrap();
|
|
first_arg_value = Some(first);
|
|
args = once(target.take_ref().unwrap())
|
|
.chain(rest.iter_mut())
|
|
.collect();
|
|
}
|
|
} else {
|
|
// func(..., ...) or func(mod::x, ...)
|
|
arg_values = args_expr
|
|
.iter()
|
|
.map(|expr| {
|
|
self.eval_expr(scope, mods, state, lib, this_ptr, expr, level)
|
|
.map(Dynamic::flatten)
|
|
})
|
|
.chain(literal_args.iter().map(|(v, _)| Ok(v.clone())))
|
|
.collect::<Result<_, _>>()?;
|
|
|
|
args = arg_values.iter_mut().collect();
|
|
}
|
|
}
|
|
|
|
let module = self.search_imports(mods, state, namespace).ok_or_else(|| {
|
|
EvalAltResult::ErrorModuleNotFound(namespace[0].name.to_string(), namespace[0].pos)
|
|
})?;
|
|
|
|
// First search in script-defined functions (can override built-in)
|
|
let func = match module.get_qualified_fn(hash) {
|
|
// Then search in Rust functions
|
|
None => {
|
|
#[cfg(not(feature = "unchecked"))]
|
|
self.inc_operations(state, pos)?;
|
|
|
|
let hash_params = calc_fn_params_hash(args.iter().map(|a| a.type_id()));
|
|
let hash_qualified_fn = combine_hashes(hash, hash_params);
|
|
|
|
module.get_qualified_fn(hash_qualified_fn)
|
|
}
|
|
r => r,
|
|
};
|
|
|
|
// Clone first argument if the function is not a method after-all
|
|
if let Some(first) = first_arg_value {
|
|
if !func.map(|f| f.is_method()).unwrap_or(true) {
|
|
let first_val = args[0].clone();
|
|
args[0] = first;
|
|
*args[0] = first_val;
|
|
}
|
|
}
|
|
|
|
match func {
|
|
#[cfg(not(feature = "no_function"))]
|
|
Some(f) if f.is_script() => {
|
|
let fn_def = f.get_fn_def();
|
|
|
|
if fn_def.body.is_empty() {
|
|
Ok(Dynamic::UNIT)
|
|
} else {
|
|
let new_scope = &mut Default::default();
|
|
|
|
let mut source = module.id_raw().cloned();
|
|
mem::swap(&mut state.source, &mut source);
|
|
|
|
let level = level + 1;
|
|
|
|
let result = self.call_script_fn(
|
|
new_scope, mods, state, lib, &mut None, fn_def, &mut args, pos, level,
|
|
);
|
|
|
|
state.source = source;
|
|
|
|
result
|
|
}
|
|
}
|
|
|
|
Some(f) if f.is_plugin_fn() => f
|
|
.get_plugin_fn()
|
|
.clone()
|
|
.call((self, fn_name, module.id(), &*mods, lib).into(), &mut args)
|
|
.map_err(|err| err.fill_position(pos)),
|
|
|
|
Some(f) if f.is_native() => {
|
|
f.get_native_fn()((self, fn_name, module.id(), &*mods, lib).into(), &mut args)
|
|
.map_err(|err| err.fill_position(pos))
|
|
}
|
|
|
|
Some(f) => unreachable!("unknown function type: {:?}", f),
|
|
|
|
None => EvalAltResult::ErrorFunctionNotFound(
|
|
self.gen_call_signature(Some(namespace), fn_name, args.as_ref()),
|
|
pos,
|
|
)
|
|
.into(),
|
|
}
|
|
}
|
|
}
|