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Avoid passing position until error.

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This commit is contained in:
Stephen Chung 2020-06-01 15:25:22 +08:00
parent 37135e2551
commit b70d38e820
4 changed files with 163 additions and 137 deletions
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10
src/api.rs
View File

@ -1104,16 +1104,20 @@ impl Engine {
) -> Result<Dynamic, Box<EvalAltResult>> {
let mut args: StaticVec<_> = arg_values.iter_mut().collect();
let lib = ast.lib();
let pos = Position::none();
let fn_def = lib
.get_function_by_signature(name, args.len(), true)
.ok_or_else(|| Box::new(EvalAltResult::ErrorFunctionNotFound(name.into(), pos)))?;
.ok_or_else(|| {
Box::new(EvalAltResult::ErrorFunctionNotFound(
name.into(),
Position::none(),
))
})?;
let mut state = State::new();
let args = args.as_mut();
self.call_script_fn(scope, &mut state, &lib, name, fn_def, args, pos, 0)
self.call_script_fn(scope, &mut state, &lib, name, fn_def, args, 0)
}
/// Optimize the `AST` with constants defined in an external Scope.

242
src/engine.rs
View File

@ -116,17 +116,20 @@ impl Target<'_> {
}
/// Update the value of the `Target`.
pub fn set_value(&mut self, new_val: Dynamic, pos: Position) -> Result<(), Box<EvalAltResult>> {
/// Position in `EvalAltResult` is None and must be set afterwards.
pub fn set_value(&mut self, new_val: Dynamic) -> Result<(), Box<EvalAltResult>> {
match self {
Target::Ref(r) => **r = new_val,
Target::Value(_) => {
return Err(Box::new(EvalAltResult::ErrorAssignmentToUnknownLHS(pos)))
return Err(Box::new(EvalAltResult::ErrorAssignmentToUnknownLHS(
Position::none(),
)))
}
Target::StringChar(Dynamic(Union::Str(ref mut s)), index, _) => {
// Replace the character at the specified index position
let new_ch = new_val
.as_char()
.map_err(|_| EvalAltResult::ErrorCharMismatch(pos))?;
.map_err(|_| EvalAltResult::ErrorCharMismatch(Position::none()))?;
let mut chars: StaticVec<char> = s.chars().collect();
let ch = chars[*index];
@ -575,6 +578,7 @@ impl Engine {
}
/// Universal method for calling functions either registered with the `Engine` or written in Rhai.
/// Position in `EvalAltResult` is None and must be set afterwards.
///
/// ## WARNING
///
@ -591,10 +595,9 @@ impl Engine {
args: &mut FnCallArgs,
is_ref: bool,
def_val: Option<&Dynamic>,
pos: Position,
level: usize,
) -> Result<(Dynamic, bool), Box<EvalAltResult>> {
self.inc_operations(state, pos)?;
self.inc_operations(state)?;
let native_only = hashes.1 == 0;
@ -603,7 +606,9 @@ impl Engine {
#[cfg(not(feature = "unchecked"))]
{
if level > self.max_call_stack_depth {
return Err(Box::new(EvalAltResult::ErrorStackOverflow(pos)));
return Err(Box::new(
EvalAltResult::ErrorStackOverflow(Position::none()),
));
}
}
@ -650,7 +655,7 @@ impl Engine {
// Run scripted function
let result =
self.call_script_fn(scope, state, lib, fn_name, fn_def, args, pos, level)?;
self.call_script_fn(scope, state, lib, fn_name, fn_def, args, level)?;
// Restore the original reference
restore_first_arg(old_this_ptr, args);
@ -674,20 +679,18 @@ impl Engine {
);
// Run external function
let result = func.get_native_fn()(args);
let result = func.get_native_fn()(args)?;
// Restore the original reference
restore_first_arg(old_this_ptr, args);
let result = result.map_err(|err| err.new_position(pos))?;
// See if the function match print/debug (which requires special processing)
return Ok(match fn_name {
KEYWORD_PRINT => (
(self.print)(result.as_str().map_err(|type_name| {
Box::new(EvalAltResult::ErrorMismatchOutputType(
type_name.into(),
pos,
Position::none(),
))
})?)
.into(),
@ -697,7 +700,7 @@ impl Engine {
(self.debug)(result.as_str().map_err(|type_name| {
Box::new(EvalAltResult::ErrorMismatchOutputType(
type_name.into(),
pos,
Position::none(),
))
})?)
.into(),
@ -724,7 +727,7 @@ impl Engine {
if let Some(prop) = extract_prop_from_getter(fn_name) {
return Err(Box::new(EvalAltResult::ErrorDotExpr(
format!("- property '{}' unknown or write-only", prop),
pos,
Position::none(),
)));
}
@ -732,7 +735,7 @@ impl Engine {
if let Some(prop) = extract_prop_from_setter(fn_name) {
return Err(Box::new(EvalAltResult::ErrorDotExpr(
format!("- property '{}' unknown or read-only", prop),
pos,
Position::none(),
)));
}
@ -745,18 +748,19 @@ impl Engine {
if fn_name == FUNC_INDEXER {
return Err(Box::new(EvalAltResult::ErrorFunctionNotFound(
format!("[]({})", types_list.join(", ")),
pos,
Position::none(),
)));
}
// Raise error
Err(Box::new(EvalAltResult::ErrorFunctionNotFound(
format!("{} ({})", fn_name, types_list.join(", ")),
pos,
Position::none(),
)))
}
/// Call a script-defined function.
/// Position in `EvalAltResult` is None and must be set afterwards.
///
/// ## WARNING
///
@ -771,7 +775,6 @@ impl Engine {
fn_name: &str,
fn_def: &FnDef,
args: &mut FnCallArgs,
pos: Position,
level: usize,
) -> Result<Dynamic, Box<EvalAltResult>> {
let orig_scope_level = state.scope_level;
@ -798,13 +801,17 @@ impl Engine {
.or_else(|err| match *err {
// Convert return statement to return value
EvalAltResult::Return(x, _) => Ok(x),
EvalAltResult::ErrorInFunctionCall(name, err, _) => Err(Box::new(
EvalAltResult::ErrorInFunctionCall(format!("{} > {}", fn_name, name), err, pos),
)),
EvalAltResult::ErrorInFunctionCall(name, err, _) => {
Err(Box::new(EvalAltResult::ErrorInFunctionCall(
format!("{} > {}", fn_name, name),
err,
Position::none(),
)))
}
_ => Err(Box::new(EvalAltResult::ErrorInFunctionCall(
fn_name.to_string(),
err,
pos,
Position::none(),
))),
});
@ -825,7 +832,8 @@ impl Engine {
|| lib.contains_key(&hashes.1)
}
// Perform an actual function call, taking care of special functions
/// Perform an actual function call, taking care of special functions
/// Position in `EvalAltResult` is None and must be set afterwards.
///
/// ## WARNING
///
@ -842,7 +850,6 @@ impl Engine {
args: &mut FnCallArgs,
is_ref: bool,
def_val: Option<&Dynamic>,
pos: Position,
level: usize,
) -> Result<(Dynamic, bool), Box<EvalAltResult>> {
// Qualifiers (none) + function name + number of arguments + argument `TypeId`'s.
@ -865,7 +872,7 @@ impl Engine {
KEYWORD_EVAL if args.len() == 1 && !self.has_override(lib, hashes) => {
Err(Box::new(EvalAltResult::ErrorRuntime(
"'eval' should not be called in method style. Try eval(...);".into(),
pos,
Position::none(),
)))
}
@ -873,24 +880,24 @@ impl Engine {
_ => {
let mut scope = Scope::new();
self.call_fn_raw(
&mut scope, state, lib, fn_name, hashes, args, is_ref, def_val, pos, level,
&mut scope, state, lib, fn_name, hashes, args, is_ref, def_val, level,
)
}
}
}
/// Evaluate a text string as a script - used primarily for 'eval'.
/// Position in `EvalAltResult` is None and must be set afterwards.
fn eval_script_expr(
&self,
scope: &mut Scope,
state: &mut State,
lib: &FunctionsLib,
script: &Dynamic,
pos: Position,
) -> Result<Dynamic, Box<EvalAltResult>> {
let script = script
.as_str()
.map_err(|type_name| EvalAltResult::ErrorMismatchOutputType(type_name.into(), pos))?;
let script = script.as_str().map_err(|type_name| {
EvalAltResult::ErrorMismatchOutputType(type_name.into(), Position::none())
})?;
// Compile the script text
// No optimizations because we only run it once
@ -903,7 +910,7 @@ impl Engine {
// If new functions are defined within the eval string, it is an error
if !ast.lib().is_empty() {
return Err(Box::new(EvalAltResult::ErrorParsing(
ParseErrorType::WrongFnDefinition.into_err(pos),
ParseErrorType::WrongFnDefinition.into_err(Position::none()),
)));
}
@ -911,17 +918,16 @@ impl Engine {
let ast = AST::new(statements, lib.clone());
// Evaluate the AST
let (result, operations) = self
.eval_ast_with_scope_raw(scope, &ast)
.map_err(|err| err.new_position(pos))?;
let (result, operations) = self.eval_ast_with_scope_raw(scope, &ast)?;
state.operations += operations;
self.inc_operations(state, pos)?;
self.inc_operations(state)?;
return Ok(result);
}
/// Chain-evaluate a dot/index chain.
/// Position in `EvalAltResult` is None and must be set afterwards.
fn eval_dot_index_chain_helper(
&self,
state: &mut State,
@ -930,7 +936,6 @@ impl Engine {
rhs: &Expr,
idx_values: &mut StaticVec<Dynamic>,
is_index: bool,
op_pos: Position,
level: usize,
mut new_val: Option<Dynamic>,
) -> Result<(Dynamic, bool), Box<EvalAltResult>> {
@ -951,25 +956,27 @@ impl Engine {
let (idx, expr, pos) = x.as_ref();
let is_idx = matches!(rhs, Expr::Index(_));
let idx_pos = idx.position();
let this_ptr = &mut self.get_indexed_mut(
state, lib, obj, is_ref, idx_val, idx_pos, op_pos, false,
)?;
let this_ptr = &mut self
.get_indexed_mut(state, lib, obj, is_ref, idx_val, idx_pos, false)?;
self.eval_dot_index_chain_helper(
state, lib, this_ptr, expr, idx_values, is_idx, *pos, level, new_val,
state, lib, this_ptr, expr, idx_values, is_idx, level, new_val,
)
.map_err(|err| EvalAltResult::new_position(err, *pos))
}
// xxx[rhs] = new_val
_ if new_val.is_some() => {
let this_ptr = &mut self
.get_indexed_mut(state, lib, obj, is_ref, idx_val, pos, op_pos, true)?;
let this_ptr =
&mut self.get_indexed_mut(state, lib, obj, is_ref, idx_val, pos, true)?;
this_ptr.set_value(new_val.unwrap(), rhs.position())?;
this_ptr
.set_value(new_val.unwrap())
.map_err(|err| EvalAltResult::new_position(err, rhs.position()))?;
Ok((Default::default(), true))
}
// xxx[rhs]
_ => self
.get_indexed_mut(state, lib, obj, is_ref, idx_val, pos, op_pos, false)
.get_indexed_mut(state, lib, obj, is_ref, idx_val, pos, false)
.map(|v| (v.clone_into_dynamic(), false)),
}
} else {
@ -989,9 +996,8 @@ impl Engine {
.collect();
let args = arg_values.as_mut();
self.exec_fn_call(
state, lib, name, *native, *hash, args, is_ref, def_val, *pos, 0,
)
self.exec_fn_call(state, lib, name, *native, *hash, args, is_ref, def_val, 0)
.map_err(|err| EvalAltResult::new_position(err, *pos))
}
// xxx.module::fn_name(...) - syntax error
Expr::FnCall(_) => unreachable!(),
@ -1001,9 +1007,10 @@ impl Engine {
let ((prop, _, _), pos) = x.as_ref();
let index = prop.clone().into();
let mut val =
self.get_indexed_mut(state, lib, obj, is_ref, index, *pos, op_pos, true)?;
self.get_indexed_mut(state, lib, obj, is_ref, index, *pos, true)?;
val.set_value(new_val.unwrap(), rhs.position())?;
val.set_value(new_val.unwrap())
.map_err(|err| EvalAltResult::new_position(err, rhs.position()))?;
Ok((Default::default(), true))
}
// {xxx:map}.id
@ -1011,8 +1018,7 @@ impl Engine {
Expr::Property(x) if obj.is::<Map>() => {
let ((prop, _, _), pos) = x.as_ref();
let index = prop.clone().into();
let val =
self.get_indexed_mut(state, lib, obj, is_ref, index, *pos, op_pos, false)?;
let val = self.get_indexed_mut(state, lib, obj, is_ref, index, *pos, false)?;
Ok((val.clone_into_dynamic(), false))
}
@ -1020,19 +1026,17 @@ impl Engine {
Expr::Property(x) if new_val.is_some() => {
let ((_, _, setter), pos) = x.as_ref();
let mut args = [obj, new_val.as_mut().unwrap()];
self.exec_fn_call(
state, lib, setter, true, 0, &mut args, is_ref, None, *pos, 0,
)
.map(|(v, _)| (v, true))
self.exec_fn_call(state, lib, setter, true, 0, &mut args, is_ref, None, 0)
.map(|(v, _)| (v, true))
.map_err(|err| EvalAltResult::new_position(err, *pos))
}
// xxx.id
Expr::Property(x) => {
let ((_, getter, _), pos) = x.as_ref();
let mut args = [obj];
self.exec_fn_call(
state, lib, getter, true, 0, &mut args, is_ref, None, *pos, 0,
)
.map(|(v, _)| (v, false))
self.exec_fn_call(state, lib, getter, true, 0, &mut args, is_ref, None, 0)
.map(|(v, _)| (v, false))
.map_err(|err| EvalAltResult::new_position(err, *pos))
}
#[cfg(not(feature = "no_object"))]
// {xxx:map}.prop[expr] | {xxx:map}.prop.expr
@ -1043,14 +1047,15 @@ impl Engine {
let mut val = if let Expr::Property(p) = prop {
let ((prop, _, _), _) = p.as_ref();
let index = prop.clone().into();
self.get_indexed_mut(state, lib, obj, is_ref, index, *pos, op_pos, false)?
self.get_indexed_mut(state, lib, obj, is_ref, index, *pos, false)?
} else {
unreachable!();
};
self.eval_dot_index_chain_helper(
state, lib, &mut val, expr, idx_values, is_idx, *pos, level, new_val,
state, lib, &mut val, expr, idx_values, is_idx, level, new_val,
)
.map_err(|err| EvalAltResult::new_position(err, *pos))
}
// xxx.prop[expr] | xxx.prop.expr
Expr::Index(x) | Expr::Dot(x) => {
@ -1061,16 +1066,19 @@ impl Engine {
let (mut val, updated) = if let Expr::Property(p) = prop {
let ((_, getter, _), _) = p.as_ref();
let args = &mut args[..1];
self.exec_fn_call(state, lib, getter, true, 0, args, is_ref, None, *pos, 0)?
self.exec_fn_call(state, lib, getter, true, 0, args, is_ref, None, 0)
.map_err(|err| EvalAltResult::new_position(err, *pos))?
} else {
unreachable!();
};
let val = &mut val;
let target = &mut val.into();
let (result, may_be_changed) = self.eval_dot_index_chain_helper(
state, lib, target, expr, idx_values, is_idx, *pos, level, new_val,
)?;
let (result, may_be_changed) = self
.eval_dot_index_chain_helper(
state, lib, target, expr, idx_values, is_idx, level, new_val,
)
.map_err(|err| EvalAltResult::new_position(err, *pos))?;
// Feed the value back via a setter just in case it has been updated
if updated || may_be_changed {
@ -1078,14 +1086,12 @@ impl Engine {
let ((_, _, setter), _) = p.as_ref();
// Re-use args because the first &mut parameter will not be consumed
args[1] = val;
self.exec_fn_call(
state, lib, setter, true, 0, args, is_ref, None, *pos, 0,
)
.or_else(|err| match *err {
// If there is no setter, no need to feed it back because the property is read-only
EvalAltResult::ErrorDotExpr(_, _) => Ok(Default::default()),
err => Err(Box::new(err)),
})?;
self.exec_fn_call(state, lib, setter, true, 0, args, is_ref, None, 0)
.or_else(|err| match *err {
// If there is no setter, no need to feed it back because the property is read-only
EvalAltResult::ErrorDotExpr(_, _) => Ok(Default::default()),
err => Err(EvalAltResult::new_position(Box::new(err), *pos)),
})?;
}
}
@ -1124,7 +1130,8 @@ impl Engine {
// id.??? or id[???]
Expr::Variable(_) => {
let (target, name, typ, pos) = search_scope(scope, state, dot_lhs)?;
self.inc_operations(state, pos)?;
self.inc_operations(state)
.map_err(|err| EvalAltResult::new_position(err, pos))?;
// Constants cannot be modified
match typ {
@ -1140,9 +1147,10 @@ impl Engine {
let this_ptr = &mut target.into();
self.eval_dot_index_chain_helper(
state, lib, this_ptr, dot_rhs, idx_values, is_index, *op_pos, level, new_val,
state, lib, this_ptr, dot_rhs, idx_values, is_index, level, new_val,
)
.map(|(v, _)| v)
.map_err(|err| EvalAltResult::new_position(err, *op_pos))
}
// {expr}.??? = ??? or {expr}[???] = ???
expr if new_val.is_some() => {
@ -1155,9 +1163,10 @@ impl Engine {
let val = self.eval_expr(scope, state, lib, expr, level)?;
let this_ptr = &mut val.into();
self.eval_dot_index_chain_helper(
state, lib, this_ptr, dot_rhs, idx_values, is_index, *op_pos, level, new_val,
state, lib, this_ptr, dot_rhs, idx_values, is_index, level, new_val,
)
.map(|(v, _)| v)
.map_err(|err| EvalAltResult::new_position(err, *op_pos))
}
}
}
@ -1177,7 +1186,8 @@ impl Engine {
size: usize,
level: usize,
) -> Result<(), Box<EvalAltResult>> {
self.inc_operations(state, expr.position())?;
self.inc_operations(state)
.map_err(|err| EvalAltResult::new_position(err, expr.position()))?;
match expr {
Expr::FnCall(x) if x.1.is_none() => {
@ -1211,6 +1221,7 @@ impl Engine {
}
/// Get the value at the indexed position of a base type
/// Position in `EvalAltResult` may be None and should be set afterwards.
fn get_indexed_mut<'a>(
&self,
state: &mut State,
@ -1219,10 +1230,9 @@ impl Engine {
is_ref: bool,
mut idx: Dynamic,
idx_pos: Position,
op_pos: Position,
create: bool,
) -> Result<Target<'a>, Box<EvalAltResult>> {
self.inc_operations(state, op_pos)?;
self.inc_operations(state)?;
match val {
#[cfg(not(feature = "no_index"))]
@ -1292,10 +1302,13 @@ impl Engine {
let fn_name = FUNC_INDEXER;
let type_name = self.map_type_name(val.type_name());
let args = &mut [val, &mut idx];
self.exec_fn_call(state, lib, fn_name, true, 0, args, is_ref, None, op_pos, 0)
self.exec_fn_call(state, lib, fn_name, true, 0, args, is_ref, None, 0)
.map(|(v, _)| v.into())
.map_err(|_| {
Box::new(EvalAltResult::ErrorIndexingType(type_name.into(), op_pos))
Box::new(EvalAltResult::ErrorIndexingType(
type_name.into(),
Position::none(),
))
})
}
}
@ -1311,7 +1324,8 @@ impl Engine {
rhs: &Expr,
level: usize,
) -> Result<Dynamic, Box<EvalAltResult>> {
self.inc_operations(state, rhs.position())?;
self.inc_operations(state)
.map_err(|err| EvalAltResult::new_position(err, rhs.position()))?;
let lhs_value = self.eval_expr(scope, state, lib, lhs, level)?;
let rhs_value = self.eval_expr(scope, state, lib, rhs, level)?;
@ -1327,7 +1341,6 @@ impl Engine {
for value in rhs_value.iter_mut() {
let args = &mut [&mut lhs_value.clone(), value];
let def_value = Some(&def_value);
let pos = rhs.position();
let hashes = (
// Qualifiers (none) + function name + number of arguments + argument `TypeId`'s.
@ -1335,9 +1348,11 @@ impl Engine {
0,
);
let (r, _) = self.call_fn_raw(
&mut scope, state, lib, op, hashes, args, false, def_value, pos, level,
)?;
let (r, _) = self
.call_fn_raw(
&mut scope, state, lib, op, hashes, args, false, def_value, level,
)
.map_err(|err| EvalAltResult::new_position(err, rhs.position()))?;
if r.as_bool().unwrap_or(false) {
return Ok(true.into());
}
@ -1371,7 +1386,8 @@ impl Engine {
expr: &Expr,
level: usize,
) -> Result<Dynamic, Box<EvalAltResult>> {
self.inc_operations(state, expr.position())?;
self.inc_operations(state)
.map_err(|err| EvalAltResult::new_position(err, expr.position()))?;
match expr {
Expr::Expr(x) => self.eval_expr(scope, state, lib, x.as_ref(), level),
@ -1395,7 +1411,8 @@ impl Engine {
let (lhs_expr, op, rhs_expr, op_pos) = x.as_ref();
let mut rhs_val = self.eval_expr(scope, state, lib, rhs_expr, level)?;
let (lhs_ptr, name, typ, pos) = search_scope(scope, state, lhs_expr)?;
self.inc_operations(state, pos)?;
self.inc_operations(state)
.map_err(|err| EvalAltResult::new_position(err, pos))?;
match typ {
// Assignment to constant variable
@ -1432,10 +1449,9 @@ impl Engine {
// Set variable value
*lhs_ptr = self
.exec_fn_call(
state, lib, op, true, hash, args, false, None, *op_pos, level,
)
.map(|(v, _)| v)?;
.exec_fn_call(state, lib, op, true, hash, args, false, None, level)
.map(|(v, _)| v)
.map_err(|err| EvalAltResult::new_position(err, *op_pos))?;
}
Ok(Default::default())
}
@ -1460,10 +1476,9 @@ impl Engine {
&mut self.eval_expr(scope, state, lib, lhs_expr, level)?,
&mut rhs_val,
];
self.exec_fn_call(
state, lib, op, true, hash, args, false, None, *op_pos, level,
)
.map(|(v, _)| v)?
self.exec_fn_call(state, lib, op, true, hash, args, false, None, level)
.map(|(v, _)| v)
.map_err(|err| EvalAltResult::new_position(err, *op_pos))?
});
match lhs_expr {
@ -1531,11 +1546,11 @@ impl Engine {
if !self.has_override(lib, (hash_fn, *hash)) {
// eval - only in function call style
let prev_len = scope.len();
let pos = args_expr.get(0).position();
// Evaluate the text string as a script
let script = self.eval_expr(scope, state, lib, args_expr.get(0), level)?;
let result = self.eval_script_expr(scope, state, lib, &script, pos);
let expr = args_expr.get(0);
let script = self.eval_expr(scope, state, lib, expr, level)?;
let result = self
.eval_script_expr(scope, state, lib, &script)
.map_err(|err| EvalAltResult::new_position(err, expr.position()));
if scope.len() != prev_len {
// IMPORTANT! If the eval defines new variables in the current scope,
@ -1568,7 +1583,8 @@ impl Engine {
.collect::<Result<_, _>>()?;
let (target, _, typ, pos) = search_scope(scope, state, lhs)?;
self.inc_operations(state, pos)?;
self.inc_operations(state)
.map_err(|err| EvalAltResult::new_position(err, pos))?;
match typ {
ScopeEntryType::Module => unreachable!(),
@ -1593,9 +1609,10 @@ impl Engine {
let args = args.as_mut();
self.exec_fn_call(
state, lib, name, *native, *hash, args, is_ref, def_val, *pos, level,
state, lib, name, *native, *hash, args, is_ref, def_val, level,
)
.map(|(v, _)| v)
.map_err(|err| EvalAltResult::new_position(err, *pos))
}
// Module-qualified function call
@ -1628,7 +1645,8 @@ impl Engine {
let func = match module.get_qualified_fn(name, *hash_fn_def) {
Err(err) if matches!(*err, EvalAltResult::ErrorFunctionNotFound(_, _)) => {
// Then search in Rust functions
self.inc_operations(state, *pos)?;
self.inc_operations(state)
.map_err(|err| EvalAltResult::new_position(err, *pos))?;
// Rust functions are indexed in two steps:
// 1) Calculate a hash in a similar manner to script-defined functions,
@ -1650,7 +1668,8 @@ impl Engine {
let args = args.as_mut();
let fn_def = x.get_fn_def();
let mut scope = Scope::new();
self.call_script_fn(&mut scope, state, lib, name, fn_def, args, *pos, level)
self.call_script_fn(&mut scope, state, lib, name, fn_def, args, level)
.map_err(|err| EvalAltResult::new_position(err, *pos))
}
Ok(x) => x.get_native_fn()(args.as_mut()).map_err(|err| err.new_position(*pos)),
Err(err)
@ -1718,7 +1737,8 @@ impl Engine {
stmt: &Stmt,
level: usize,
) -> Result<Dynamic, Box<EvalAltResult>> {
self.inc_operations(state, stmt.position())?;
self.inc_operations(state)
.map_err(|err| EvalAltResult::new_position(err, stmt.position()))?;
match stmt {
// No-op
@ -1823,7 +1843,8 @@ impl Engine {
for loop_var in func(iter_type) {
*scope.get_mut(index).0 = loop_var;
self.inc_operations(state, stmt.position())?;
self.inc_operations(state)
.map_err(|err| EvalAltResult::new_position(err, stmt.position()))?;
match self.eval_stmt(scope, state, lib, stmt, level) {
Ok(_) => (),
@ -1975,14 +1996,17 @@ impl Engine {
}
/// Check if the number of operations stay within limit.
fn inc_operations(&self, state: &mut State, pos: Position) -> Result<(), Box<EvalAltResult>> {
/// Position in `EvalAltResult` is None and must be set afterwards.
fn inc_operations(&self, state: &mut State) -> Result<(), Box<EvalAltResult>> {
state.operations += 1;
#[cfg(not(feature = "unchecked"))]
{
// Guard against too many operations
if state.operations > self.max_operations {
return Err(Box::new(EvalAltResult::ErrorTooManyOperations(pos)));
return Err(Box::new(EvalAltResult::ErrorTooManyOperations(
Position::none(),
)));
}
}
@ -1990,7 +2014,7 @@ impl Engine {
if let Some(progress) = &self.progress {
if !progress(state.operations) {
// Terminate script if progress returns false
return Err(Box::new(EvalAltResult::ErrorTerminated(pos)));
return Err(Box::new(EvalAltResult::ErrorTerminated(Position::none())));
}
}

40
src/optimize.rs
View File

@ -5,9 +5,7 @@ use crate::engine::{
KEYWORD_TYPE_OF,
};
use crate::parser::{map_dynamic_to_expr, Expr, FnDef, ReturnType, Stmt, AST};
use crate::result::EvalAltResult;
use crate::scope::{Entry as ScopeEntry, EntryType as ScopeEntryType, Scope};
use crate::token::Position;
use crate::utils::StaticVec;
use crate::stdlib::{
@ -113,8 +111,7 @@ fn call_fn_with_constant_arguments(
state: &State,
fn_name: &str,
arg_values: &mut [Dynamic],
pos: Position,
) -> Result<Option<Dynamic>, Box<EvalAltResult>> {
) -> Option<Dynamic> {
// Search built-in's and external functions
let hash_fn = calc_fn_hash(
empty(),
@ -134,11 +131,10 @@ fn call_fn_with_constant_arguments(
arg_values.iter_mut().collect::<StaticVec<_>>().as_mut(),
false,
None,
pos,
0,
)
.map(|(v, _)| Some(v))
.or_else(|_| Ok(None))
.unwrap_or_else(|_| None)
}
/// Optimize a statement.
@ -574,22 +570,22 @@ fn optimize_expr(expr: Expr, state: &mut State) -> Expr {
""
};
call_fn_with_constant_arguments(&state, name, arg_values.as_mut(), *pos).ok()
.and_then(|result|
result.or_else(|| {
if !arg_for_type_of.is_empty() {
// Handle `type_of()`
Some(arg_for_type_of.to_string().into())
} else {
// Otherwise use the default value, if any
def_value.clone()
}
}).and_then(|result| map_dynamic_to_expr(result, *pos))
.map(|expr| {
state.set_dirty();
expr
})
).unwrap_or_else(|| {
call_fn_with_constant_arguments(&state, name, arg_values.as_mut())
.or_else(|| {
if !arg_for_type_of.is_empty() {
// Handle `type_of()`
Some(arg_for_type_of.to_string().into())
} else {
// Otherwise use the default value, if any
def_value.clone()
}
})
.and_then(|result| map_dynamic_to_expr(result, *pos))
.map(|expr| {
state.set_dirty();
expr
})
.unwrap_or_else(|| {
// Optimize function call arguments
x.3 = x.3.into_iter().map(|a| optimize_expr(a, state)).collect();
Expr::FnCall(x)

8
src/result.rs
View File

@ -331,10 +331,12 @@ impl EvalAltResult {
}
}
/// Consume the current `EvalAltResult` and return a new one
/// with the specified `Position`.
/// Consume the current `EvalAltResult` and return a new one with the specified `Position`
/// if the current position is `Position::None`.
pub(crate) fn new_position(mut self: Box<Self>, new_position: Position) -> Box<Self> {
self.set_position(new_position);
if self.position().is_none() {
self.set_position(new_position);
}
self
}
}