885 lines
34 KiB
Rust
885 lines
34 KiB
Rust
//! Module defining functions for evaluating a statement.
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use super::{Caches, EvalContext, GlobalRuntimeState, Target};
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use crate::api::events::VarDefInfo;
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use crate::ast::{
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ASTFlags, BinaryExpr, Expr, Ident, OpAssignment, Stmt, SwitchCasesCollection, TryCatchBlock,
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};
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use crate::func::{get_builtin_op_assignment_fn, get_hasher};
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use crate::types::dynamic::AccessMode;
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use crate::types::RestoreOnDrop;
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use crate::{Dynamic, Engine, RhaiResult, RhaiResultOf, Scope, ERR, INT};
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use std::hash::{Hash, Hasher};
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#[cfg(feature = "no_std")]
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use std::prelude::v1::*;
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impl Engine {
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/// Evaluate a statements block.
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pub(crate) fn eval_stmt_block(
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&self,
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global: &mut GlobalRuntimeState,
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caches: &mut Caches,
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scope: &mut Scope,
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this_ptr: &mut Dynamic,
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statements: &[Stmt],
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restore_orig_state: bool,
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) -> RhaiResult {
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if statements.is_empty() {
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return Ok(Dynamic::UNIT);
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}
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// Restore scope at end of block if necessary
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let orig_scope_len = scope.len();
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let scope = &mut *RestoreOnDrop::lock_if(restore_orig_state, scope, move |s| {
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s.rewind(orig_scope_len);
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});
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// Restore global state at end of block if necessary
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let orig_always_search_scope = global.always_search_scope;
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#[cfg(not(feature = "no_module"))]
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let orig_imports_len = global.num_imports();
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if restore_orig_state {
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global.scope_level += 1;
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}
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let global = &mut *RestoreOnDrop::lock_if(restore_orig_state, global, move |g| {
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g.scope_level -= 1;
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#[cfg(not(feature = "no_module"))]
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g.truncate_imports(orig_imports_len);
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// The impact of new local variables goes away at the end of a block
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// because any new variables introduced will go out of scope
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g.always_search_scope = orig_always_search_scope;
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});
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// Pop new function resolution caches at end of block
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let orig_fn_resolution_caches_len = caches.fn_resolution_caches_len();
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let caches = &mut *RestoreOnDrop::lock(caches, move |c| {
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c.rewind_fn_resolution_caches(orig_fn_resolution_caches_len)
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});
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// Run the statements
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statements.iter().try_fold(Dynamic::UNIT, |_, stmt| {
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#[cfg(not(feature = "no_module"))]
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let imports_len = global.num_imports();
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let result =
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self.eval_stmt(global, caches, scope, this_ptr, stmt, restore_orig_state)?;
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#[cfg(not(feature = "no_module"))]
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if matches!(stmt, Stmt::Import(..)) {
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// Get the extra modules - see if any functions are marked global.
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// Without global functions, the extra modules never affect function resolution.
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if global
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.scan_imports_raw()
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.skip(imports_len)
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.any(|(.., m)| m.contains_indexed_global_functions())
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{
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// Different scenarios where the cache must be cleared - notice that this is
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// expensive as all function resolutions must start again
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if caches.fn_resolution_caches_len() > orig_fn_resolution_caches_len {
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// When new module is imported with global functions and there is already
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// a new cache, just clear it
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caches.fn_resolution_cache_mut().clear();
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} else if restore_orig_state {
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// When new module is imported with global functions, push a new cache
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caches.push_fn_resolution_cache();
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} else {
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// When the block is to be evaluated in-place, just clear the current cache
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caches.fn_resolution_cache_mut().clear();
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}
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}
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}
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Ok(result)
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})
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}
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/// Evaluate an op-assignment statement.
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pub(crate) fn eval_op_assignment(
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&self,
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global: &mut GlobalRuntimeState,
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caches: &mut Caches,
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op_info: &OpAssignment,
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root: &Expr,
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target: &mut Target,
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mut new_val: Dynamic,
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) -> RhaiResultOf<()> {
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// Assignment to constant variable?
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if target.is_read_only() {
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let name = root.get_variable_name(false).unwrap_or_default();
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let pos = root.start_position();
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return Err(ERR::ErrorAssignmentToConstant(name.to_string(), pos).into());
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}
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if op_info.is_op_assignment() {
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let OpAssignment {
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hash_op_assign,
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hash_op,
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op_assign: op_assign_token,
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op: op_token,
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pos: op_pos,
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} = op_info;
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let mut lock_guard = target.write_lock::<Dynamic>().unwrap();
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let hash = *hash_op_assign;
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let args = &mut [&mut *lock_guard, &mut new_val];
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if self.fast_operators() {
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if let Some(func) = get_builtin_op_assignment_fn(op_assign_token, args[0], args[1])
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{
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// Built-in found
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let op = op_assign_token.literal_syntax();
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let orig_level = global.level;
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global.level += 1;
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let global = &*RestoreOnDrop::lock(global, move |g| g.level = orig_level);
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let context = (self, op, None, global, *op_pos).into();
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return func(context, args).map(|_| ());
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}
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}
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let op_assign = op_assign_token.literal_syntax();
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let op = op_token.literal_syntax();
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let token = Some(op_assign_token);
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match self
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.exec_native_fn_call(global, caches, op_assign, token, hash, args, true, *op_pos)
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{
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Ok(_) => (),
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Err(err) if matches!(*err, ERR::ErrorFunctionNotFound(ref f, ..) if f.starts_with(op_assign)) =>
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{
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// Expand to `var = var op rhs`
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let token = Some(op_token);
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*args[0] = self
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.exec_native_fn_call(
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global, caches, op, token, *hash_op, args, true, *op_pos,
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)?
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.0;
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}
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Err(err) => return Err(err),
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}
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self.check_data_size(&*args[0], root.position())?;
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} else {
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// Normal assignment
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// If value is a string, intern it
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if new_val.is_string() {
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let value = new_val.into_immutable_string().expect("`ImmutableString`");
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new_val = self.get_interned_string(value).into();
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}
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*target.write_lock::<Dynamic>().unwrap() = new_val;
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}
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target.propagate_changed_value(op_info.pos)
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}
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/// Evaluate a statement.
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pub(crate) fn eval_stmt(
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&self,
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global: &mut GlobalRuntimeState,
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caches: &mut Caches,
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scope: &mut Scope,
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this_ptr: &mut Dynamic,
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stmt: &Stmt,
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rewind_scope: bool,
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) -> RhaiResult {
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#[cfg(feature = "debugging")]
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let reset = self.run_debugger_with_reset(global, caches, scope, this_ptr, stmt)?;
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#[cfg(feature = "debugging")]
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let global = &mut *RestoreOnDrop::lock(global, move |g| g.debugger.reset_status(reset));
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// Coded this way for better branch prediction.
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// Popular branches are lifted out of the `match` statement into their own branches.
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// Function calls should account for a relatively larger portion of statements.
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if let Stmt::FnCall(x, pos) = stmt {
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self.track_operation(global, stmt.position())?;
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return self.eval_fn_call_expr(global, caches, scope, this_ptr, x, *pos);
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}
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// Then assignments.
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// We shouldn't do this for too many variants because, soon or later, the added comparisons
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// will cost more than the mis-predicted `match` branch.
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if let Stmt::Assignment(x, ..) = stmt {
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let (op_info, BinaryExpr { lhs, rhs }) = &**x;
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self.track_operation(global, stmt.position())?;
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if let Expr::Variable(x, ..) = lhs {
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let rhs_val = self
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.eval_expr(global, caches, scope, this_ptr, rhs)?
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.flatten();
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let mut target = self.search_namespace(global, caches, scope, this_ptr, lhs)?;
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let var_name = x.3.as_str();
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#[cfg(not(feature = "no_closure"))]
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// Also handle case where target is a `Dynamic` shared value
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// (returned by a variable resolver, for example)
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let is_temp_result = !target.is_ref() && !target.is_shared();
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#[cfg(feature = "no_closure")]
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let is_temp_result = !target.is_ref();
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// Cannot assign to temp result from expression
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if is_temp_result {
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return Err(ERR::ErrorAssignmentToConstant(
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var_name.to_string(),
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lhs.position(),
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)
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.into());
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}
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self.track_operation(global, lhs.position())?;
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self.eval_op_assignment(global, caches, op_info, lhs, &mut target, rhs_val)?;
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return Ok(Dynamic::UNIT);
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}
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#[cfg(any(not(feature = "no_index"), not(feature = "no_object")))]
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{
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let mut rhs_val = self
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.eval_expr(global, caches, scope, this_ptr, rhs)?
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.flatten();
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// If value is a string, intern it
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if rhs_val.is_string() {
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let value = rhs_val.into_immutable_string().expect("`ImmutableString`");
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rhs_val = self.get_interned_string(value).into();
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}
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let _new_val = Some((rhs_val, op_info));
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// Must be either `var[index] op= val` or `var.prop op= val`
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match lhs {
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// name op= rhs (handled above)
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Expr::Variable(..) => {
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unreachable!("Expr::Variable case is already handled")
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}
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// idx_lhs[idx_expr] op= rhs
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#[cfg(not(feature = "no_index"))]
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Expr::Index(..) => {
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self.eval_dot_index_chain(global, caches, scope, this_ptr, lhs, _new_val)
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}
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// dot_lhs.dot_rhs op= rhs
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#[cfg(not(feature = "no_object"))]
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Expr::Dot(..) => {
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self.eval_dot_index_chain(global, caches, scope, this_ptr, lhs, _new_val)
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}
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_ => unreachable!("cannot assign to expression: {:?}", lhs),
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}?;
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return Ok(Dynamic::UNIT);
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}
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}
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self.track_operation(global, stmt.position())?;
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match stmt {
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// No-op
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Stmt::Noop(..) => Ok(Dynamic::UNIT),
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// Expression as statement
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Stmt::Expr(expr) => self
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.eval_expr(global, caches, scope, this_ptr, expr)
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.map(Dynamic::flatten),
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// Block scope
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Stmt::Block(statements, ..) if statements.is_empty() => Ok(Dynamic::UNIT),
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Stmt::Block(statements, ..) => {
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self.eval_stmt_block(global, caches, scope, this_ptr, statements, true)
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}
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// If statement
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Stmt::If(x, ..) => {
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let (expr, if_block, else_block) = &**x;
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let guard_val = self
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.eval_expr(global, caches, scope, this_ptr, expr)?
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.as_bool()
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.map_err(|typ| self.make_type_mismatch_err::<bool>(typ, expr.position()))?;
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if guard_val && !if_block.is_empty() {
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self.eval_stmt_block(global, caches, scope, this_ptr, if_block, true)
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} else if !guard_val && !else_block.is_empty() {
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self.eval_stmt_block(global, caches, scope, this_ptr, else_block, true)
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} else {
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Ok(Dynamic::UNIT)
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}
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}
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// Switch statement
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Stmt::Switch(x, ..) => {
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let (
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expr,
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SwitchCasesCollection {
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expressions,
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cases,
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def_case,
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ranges,
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},
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) = &**x;
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let mut result = None;
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let value = self.eval_expr(global, caches, scope, this_ptr, expr)?;
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if value.is_hashable() {
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let hasher = &mut get_hasher();
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value.hash(hasher);
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let hash = hasher.finish();
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// First check hashes
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if let Some(case_blocks_list) = cases.get(&hash) {
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assert!(!case_blocks_list.is_empty());
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for &index in case_blocks_list {
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let block = &expressions[index];
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let cond_result = match block.condition {
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Expr::BoolConstant(b, ..) => b,
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ref c => self
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.eval_expr(global, caches, scope, this_ptr, c)?
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.as_bool()
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.map_err(|typ| {
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self.make_type_mismatch_err::<bool>(typ, c.position())
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})?,
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};
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if cond_result {
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result = Some(&block.expr);
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break;
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}
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}
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} else if value.is_int() && !ranges.is_empty() {
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// Then check integer ranges
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let value = value.as_int().expect("`INT`");
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for r in ranges.iter().filter(|r| r.contains(value)) {
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let block = &expressions[r.index()];
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let cond_result = match block.condition {
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Expr::BoolConstant(b, ..) => b,
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ref c => self
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.eval_expr(global, caches, scope, this_ptr, c)?
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.as_bool()
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.map_err(|typ| {
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self.make_type_mismatch_err::<bool>(typ, c.position())
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})?,
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};
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if cond_result {
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result = Some(&block.expr);
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break;
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}
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}
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}
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}
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result
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.or_else(|| def_case.as_ref().map(|&index| &expressions[index].expr))
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.map_or(Ok(Dynamic::UNIT), |expr| {
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self.eval_expr(global, caches, scope, this_ptr, expr)
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})
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}
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// Loop
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Stmt::While(x, ..) if matches!(x.0, Expr::Unit(..) | Expr::BoolConstant(true, ..)) => {
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let (.., body) = &**x;
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if body.is_empty() {
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loop {
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self.track_operation(global, body.position())?;
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}
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}
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loop {
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if let Err(err) =
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self.eval_stmt_block(global, caches, scope, this_ptr, body, true)
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{
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match *err {
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ERR::LoopBreak(false, ..) => (),
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ERR::LoopBreak(true, value, ..) => break Ok(value),
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_ => break Err(err),
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}
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}
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}
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}
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// While loop
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Stmt::While(x, ..) => {
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let (expr, body) = &**x;
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loop {
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let condition = self
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.eval_expr(global, caches, scope, this_ptr, expr)?
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.as_bool()
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.map_err(|typ| self.make_type_mismatch_err::<bool>(typ, expr.position()))?;
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if !condition {
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break Ok(Dynamic::UNIT);
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}
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if body.is_empty() {
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continue;
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}
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if let Err(err) =
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self.eval_stmt_block(global, caches, scope, this_ptr, body, true)
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{
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match *err {
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ERR::LoopBreak(false, ..) => (),
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ERR::LoopBreak(true, value, ..) => break Ok(value),
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_ => break Err(err),
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}
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}
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}
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}
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// Do loop
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Stmt::Do(x, options, ..) => {
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let (expr, body) = &**x;
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let is_while = !options.contains(ASTFlags::NEGATED);
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loop {
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if !body.is_empty() {
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if let Err(err) =
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self.eval_stmt_block(global, caches, scope, this_ptr, body, true)
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{
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match *err {
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ERR::LoopBreak(false, ..) => continue,
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ERR::LoopBreak(true, value, ..) => break Ok(value),
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_ => break Err(err),
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}
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}
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}
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let condition = self
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.eval_expr(global, caches, scope, this_ptr, expr)?
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.as_bool()
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.map_err(|typ| self.make_type_mismatch_err::<bool>(typ, expr.position()))?;
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if condition ^ is_while {
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break Ok(Dynamic::UNIT);
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}
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}
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}
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// For loop
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Stmt::For(x, ..) => {
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let (var_name, counter, expr, statements) = &**x;
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let iter_obj = self
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.eval_expr(global, caches, scope, this_ptr, expr)?
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.flatten();
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let iter_type = iter_obj.type_id();
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// lib should only contain scripts, so technically they cannot have iterators
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// Search order:
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// 1) Global namespace - functions registered via Engine::register_XXX
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// 2) Global modules - packages
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// 3) Imported modules - functions marked with global namespace
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// 4) Global sub-modules - functions marked with global namespace
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let func = self
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.global_modules
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.iter()
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.find_map(|m| m.get_iter(iter_type));
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#[cfg(not(feature = "no_module"))]
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let func = func.or_else(|| global.get_iter(iter_type)).or_else(|| {
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self.global_sub_modules
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.values()
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.find_map(|m| m.get_qualified_iter(iter_type))
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});
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let func = func.ok_or_else(|| ERR::ErrorFor(expr.start_position()))?;
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// Restore scope at end of statement
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let orig_scope_len = scope.len();
|
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let scope = &mut *RestoreOnDrop::lock(scope, move |s| {
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s.rewind(orig_scope_len);
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});
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|
|
// Add the loop variables
|
|
let counter_index = if counter.is_empty() {
|
|
usize::MAX
|
|
} else {
|
|
scope.push(counter.name.clone(), 0 as INT);
|
|
scope.len() - 1
|
|
};
|
|
|
|
scope.push(var_name.name.clone(), ());
|
|
let index = scope.len() - 1;
|
|
|
|
let mut result = Dynamic::UNIT;
|
|
|
|
for (x, iter_value) in func(iter_obj).enumerate() {
|
|
// Increment counter
|
|
if counter_index < usize::MAX {
|
|
// As the variable increments from 0, this should always work
|
|
// since any overflow will first be caught below.
|
|
let index_value = x as INT;
|
|
|
|
#[cfg(not(feature = "unchecked"))]
|
|
if index_value > crate::MAX_USIZE_INT {
|
|
return Err(ERR::ErrorArithmetic(
|
|
format!("for-loop counter overflow: {x}"),
|
|
counter.pos,
|
|
)
|
|
.into());
|
|
}
|
|
|
|
*scope.get_mut_by_index(counter_index).write_lock().unwrap() =
|
|
Dynamic::from_int(index_value);
|
|
}
|
|
|
|
// Set loop value
|
|
let value = iter_value
|
|
.map_err(|err| err.fill_position(expr.position()))?
|
|
.flatten();
|
|
|
|
*scope.get_mut_by_index(index).write_lock().unwrap() = value;
|
|
|
|
// Run block
|
|
self.track_operation(global, statements.position())?;
|
|
|
|
if statements.is_empty() {
|
|
continue;
|
|
}
|
|
|
|
match self.eval_stmt_block(global, caches, scope, this_ptr, statements, true) {
|
|
Ok(_) => (),
|
|
Err(err) => match *err {
|
|
ERR::LoopBreak(false, ..) => (),
|
|
ERR::LoopBreak(true, value, ..) => {
|
|
result = value;
|
|
break;
|
|
}
|
|
_ => return Err(err),
|
|
},
|
|
}
|
|
}
|
|
|
|
Ok(result)
|
|
}
|
|
|
|
// Continue/Break statement
|
|
Stmt::BreakLoop(expr, options, pos) => {
|
|
let is_break = options.contains(ASTFlags::BREAK);
|
|
|
|
let value = if let Some(ref expr) = expr {
|
|
self.eval_expr(global, caches, scope, this_ptr, expr)?
|
|
} else {
|
|
Dynamic::UNIT
|
|
};
|
|
|
|
Err(ERR::LoopBreak(is_break, value, *pos).into())
|
|
}
|
|
|
|
// Try/Catch statement
|
|
Stmt::TryCatch(x, ..) => {
|
|
let TryCatchBlock {
|
|
try_block,
|
|
catch_var:
|
|
Ident {
|
|
name: catch_var, ..
|
|
},
|
|
catch_block,
|
|
} = &**x;
|
|
|
|
match self.eval_stmt_block(global, caches, scope, this_ptr, try_block, true) {
|
|
r @ Ok(_) => r,
|
|
Err(err) if err.is_pseudo_error() => Err(err),
|
|
Err(err) if !err.is_catchable() => Err(err),
|
|
Err(mut err) => {
|
|
let err_value = match err.unwrap_inner() {
|
|
ERR::ErrorRuntime(x, ..) => x.clone(),
|
|
|
|
#[cfg(feature = "no_object")]
|
|
_ => {
|
|
let _ = err.take_position();
|
|
err.to_string().into()
|
|
}
|
|
#[cfg(not(feature = "no_object"))]
|
|
_ => {
|
|
let mut err_map = crate::Map::new();
|
|
let err_pos = err.take_position();
|
|
|
|
err_map.insert("message".into(), err.to_string().into());
|
|
|
|
if let Some(ref source) = global.source {
|
|
err_map.insert("source".into(), source.into());
|
|
}
|
|
|
|
if !err_pos.is_none() {
|
|
err_map.insert(
|
|
"line".into(),
|
|
(err_pos.line().unwrap() as INT).into(),
|
|
);
|
|
err_map.insert(
|
|
"position".into(),
|
|
(err_pos.position().unwrap_or(0) as INT).into(),
|
|
);
|
|
}
|
|
|
|
err.dump_fields(&mut err_map);
|
|
err_map.into()
|
|
}
|
|
};
|
|
|
|
// Restore scope at end of block
|
|
let orig_scope_len = scope.len();
|
|
let scope =
|
|
&mut *RestoreOnDrop::lock_if(!catch_var.is_empty(), scope, move |s| {
|
|
s.rewind(orig_scope_len);
|
|
});
|
|
|
|
if !catch_var.is_empty() {
|
|
scope.push(catch_var.clone(), err_value);
|
|
}
|
|
|
|
self.eval_stmt_block(global, caches, scope, this_ptr, catch_block, true)
|
|
.map(|_| Dynamic::UNIT)
|
|
.map_err(|result_err| match *result_err {
|
|
// Re-throw exception
|
|
ERR::ErrorRuntime(v, pos) if v.is_unit() => {
|
|
err.set_position(pos);
|
|
err
|
|
}
|
|
_ => result_err,
|
|
})
|
|
}
|
|
}
|
|
}
|
|
|
|
// Throw value
|
|
Stmt::Return(Some(expr), options, pos) if options.contains(ASTFlags::BREAK) => self
|
|
.eval_expr(global, caches, scope, this_ptr, expr)
|
|
.and_then(|v| Err(ERR::ErrorRuntime(v.flatten(), *pos).into())),
|
|
|
|
// Empty throw
|
|
Stmt::Return(None, options, pos) if options.contains(ASTFlags::BREAK) => {
|
|
Err(ERR::ErrorRuntime(Dynamic::UNIT, *pos).into())
|
|
}
|
|
|
|
// Return value
|
|
Stmt::Return(Some(expr), .., pos) => self
|
|
.eval_expr(global, caches, scope, this_ptr, expr)
|
|
.and_then(|v| Err(ERR::Return(v.flatten(), *pos).into())),
|
|
|
|
// Empty return
|
|
Stmt::Return(None, .., pos) => Err(ERR::Return(Dynamic::UNIT, *pos).into()),
|
|
|
|
// Let/const statement - shadowing disallowed
|
|
Stmt::Var(x, .., pos) if !self.allow_shadowing() && scope.contains(&x.0) => {
|
|
Err(ERR::ErrorVariableExists(x.0.to_string(), *pos).into())
|
|
}
|
|
// Let/const statement
|
|
Stmt::Var(x, options, pos) => {
|
|
let (var_name, expr, index) = &**x;
|
|
|
|
let access = if options.contains(ASTFlags::CONSTANT) {
|
|
AccessMode::ReadOnly
|
|
} else {
|
|
AccessMode::ReadWrite
|
|
};
|
|
let export = options.contains(ASTFlags::EXPORTED);
|
|
|
|
// Check variable definition filter
|
|
if let Some(ref filter) = self.def_var_filter {
|
|
let will_shadow = scope.contains(var_name);
|
|
let is_const = access == AccessMode::ReadOnly;
|
|
let info = VarDefInfo {
|
|
name: var_name,
|
|
is_const,
|
|
nesting_level: global.scope_level,
|
|
will_shadow,
|
|
};
|
|
let context = EvalContext::new(self, global, caches, scope, this_ptr);
|
|
|
|
if !filter(true, info, context)? {
|
|
return Err(ERR::ErrorForbiddenVariable(var_name.to_string(), *pos).into());
|
|
}
|
|
}
|
|
|
|
// Evaluate initial value
|
|
let mut value = self
|
|
.eval_expr(global, caches, scope, this_ptr, expr)?
|
|
.flatten();
|
|
|
|
let _alias = if !rewind_scope {
|
|
// Put global constants into global module
|
|
#[cfg(not(feature = "no_function"))]
|
|
#[cfg(not(feature = "no_module"))]
|
|
if global.scope_level == 0
|
|
&& access == AccessMode::ReadOnly
|
|
&& global.lib.iter().any(|m| !m.is_empty())
|
|
{
|
|
crate::func::locked_write(global.constants.get_or_insert_with(|| {
|
|
crate::Shared::new(
|
|
crate::Locked::new(std::collections::BTreeMap::new()),
|
|
)
|
|
}))
|
|
.insert(var_name.name.clone(), value.clone());
|
|
}
|
|
|
|
if export {
|
|
Some(var_name)
|
|
} else {
|
|
None
|
|
}
|
|
} else if export {
|
|
unreachable!("exported variable not on global level");
|
|
} else {
|
|
None
|
|
};
|
|
|
|
if let Some(index) = index {
|
|
value.set_access_mode(access);
|
|
*scope.get_mut_by_index(scope.len() - index.get()) = value;
|
|
} else {
|
|
scope.push_entry(var_name.name.clone(), access, value);
|
|
}
|
|
|
|
#[cfg(not(feature = "no_module"))]
|
|
if let Some(alias) = _alias {
|
|
scope.add_alias_by_index(scope.len() - 1, alias.name.as_str().into());
|
|
}
|
|
|
|
Ok(Dynamic::UNIT)
|
|
}
|
|
|
|
// Import statement
|
|
#[cfg(not(feature = "no_module"))]
|
|
Stmt::Import(x, _pos) => {
|
|
use crate::ModuleResolver;
|
|
|
|
let (expr, export) = &**x;
|
|
|
|
// Guard against too many modules
|
|
if global.num_modules_loaded >= self.max_modules() {
|
|
return Err(ERR::ErrorTooManyModules(*_pos).into());
|
|
}
|
|
|
|
let v = self.eval_expr(global, caches, scope, this_ptr, expr)?;
|
|
let typ = v.type_name();
|
|
let path = v.try_cast::<crate::ImmutableString>().ok_or_else(|| {
|
|
self.make_type_mismatch_err::<crate::ImmutableString>(typ, expr.position())
|
|
})?;
|
|
|
|
let path_pos = expr.start_position();
|
|
|
|
let resolver = global.embedded_module_resolver.clone();
|
|
|
|
let module = resolver
|
|
.as_ref()
|
|
.and_then(|r| match r.resolve_raw(self, global, &path, path_pos) {
|
|
Err(err) if matches!(*err, ERR::ErrorModuleNotFound(..)) => None,
|
|
result => Some(result),
|
|
})
|
|
.or_else(|| {
|
|
Some(
|
|
self.module_resolver
|
|
.resolve_raw(self, global, &path, path_pos),
|
|
)
|
|
})
|
|
.unwrap_or_else(|| {
|
|
Err(ERR::ErrorModuleNotFound(path.to_string(), path_pos).into())
|
|
})?;
|
|
|
|
let (export, must_be_indexed) = if !export.is_empty() {
|
|
(export.name.clone(), true)
|
|
} else {
|
|
(self.const_empty_string(), false)
|
|
};
|
|
|
|
if !must_be_indexed || module.is_indexed() {
|
|
global.push_import(export, module);
|
|
} else {
|
|
// Index the module (making a clone copy if necessary) if it is not indexed
|
|
let mut m = crate::func::shared_take_or_clone(module);
|
|
m.build_index();
|
|
global.push_import(export, m);
|
|
}
|
|
|
|
global.num_modules_loaded += 1;
|
|
|
|
Ok(Dynamic::UNIT)
|
|
}
|
|
|
|
// Export statement
|
|
#[cfg(not(feature = "no_module"))]
|
|
Stmt::Export(x, ..) => {
|
|
let (Ident { name, pos, .. }, Ident { name: alias, .. }) = &**x;
|
|
// Mark scope variables as public
|
|
if let Some(index) = scope.search(name) {
|
|
let alias = if alias.is_empty() { name } else { alias }.clone();
|
|
scope.add_alias_by_index(index, alias.into());
|
|
Ok(Dynamic::UNIT)
|
|
} else {
|
|
Err(ERR::ErrorVariableNotFound(name.to_string(), *pos).into())
|
|
}
|
|
}
|
|
|
|
// Share statement
|
|
#[cfg(not(feature = "no_closure"))]
|
|
Stmt::Share(x) => {
|
|
x.iter()
|
|
.try_for_each(|(name, index, pos)| {
|
|
if let Some(index) = index
|
|
.map(|n| scope.len() - n.get())
|
|
.or_else(|| scope.search(name))
|
|
{
|
|
let val = scope.get_mut_by_index(index);
|
|
|
|
if !val.is_shared() {
|
|
// Replace the variable with a shared value.
|
|
*val = std::mem::take(val).into_shared();
|
|
}
|
|
Ok(())
|
|
} else {
|
|
Err(ERR::ErrorVariableNotFound(name.to_string(), *pos).into())
|
|
}
|
|
})
|
|
.map(|_| Dynamic::UNIT)
|
|
}
|
|
|
|
_ => unreachable!("statement cannot be evaluated: {:?}", stmt),
|
|
}
|
|
}
|
|
|
|
/// Evaluate a list of statements with no `this` pointer.
|
|
/// This is commonly used to evaluate a list of statements in an [`AST`][crate::AST] or a script function body.
|
|
#[inline]
|
|
pub(crate) fn eval_global_statements(
|
|
&self,
|
|
global: &mut GlobalRuntimeState,
|
|
caches: &mut Caches,
|
|
scope: &mut Scope,
|
|
statements: &[Stmt],
|
|
) -> RhaiResult {
|
|
let mut this = Dynamic::NULL;
|
|
|
|
self.eval_stmt_block(global, caches, scope, &mut this, statements, false)
|
|
.or_else(|err| match *err {
|
|
ERR::Return(out, ..) => Ok(out),
|
|
ERR::LoopBreak(..) => {
|
|
unreachable!("no outer loop scope to break out of")
|
|
}
|
|
_ => Err(err),
|
|
})
|
|
}
|
|
}
|