private void expressionWillThrow(CompilerMessageCallback message)
{
if (message != null && !(this is RegExpExpression))
{
message(MessageLevel.Warning, new CodeCoordinates(0, Position, Length), "Expression will throw an exception");
}
}
public override void Optimize(ref CodeNode _this, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
if (_reexportSourceModuleName != null)
{
return;
}
if (_internalDefinition != null)
{
CodeNode t = _internalDefinition;
_internalDefinition.Optimize(ref t, owner, message, opts, stats);
if (t != _internalDefinition)
{
_internalDefinition = t as VariableDefinition;
}
}
else
{
for (var i = 0; i < _map.Count; i++)
{
var v = _map[i].Value;
_map[i].Value.Optimize(ref v, owner, message, opts, stats);
if (v != _map[i].Value)
{
_map[i] = new KeyValuePair <string, Expression>(_map[i].Key, v);
}
}
}
}
/// <summary>
/// Initializes a new Module with specified code, callback for output compiler messages and compiler options.
/// </summary>
/// <param name="path">Path to file with script. Used for resolving paths to other modules for importing via import directive. Can be null or empty</param>
/// <param name="code">JavaScript code.</param>
/// <param name="messageCallback">Callback used to output compiler messages or null</param>
/// <param name="options">Compiler options</param>
public Module(string path, string code, CompilerMessageCallback messageCallback, Options options)
{
if (code == null)
{
throw new ArgumentNullException();
}
Code = code;
Context = new Context(Context.CurrentGlobalContext, true, null);
Context._module = this;
if (!string.IsNullOrWhiteSpace(path))
{
lock (__modulesCache)
{
if (!__modulesCache.ContainsKey(path))
{
__modulesCache[path] = this;
}
}
FilePath = path;
}
if (code == "")
{
return;
}
var internalCallback = messageCallback != null ? (level, cord, message) => messageCallback(level, CodeCoordinates.FromTextPosition(code, cord.Column, cord.Length), message)
: null as CompilerMessageCallback;
int i = 0;
_root = (CodeBlock)CodeBlock.Parse(new ParseInfo(Tools.removeComments(code, 0), Code, internalCallback), ref i);
var stat = new FunctionInfo();
Parser.Build(ref _root, 0, new Dictionary <string, VariableDescriptor>(), CodeContext.None, internalCallback, stat, options);
var body = _root as CodeBlock;
body._suppressScopeIsolation = SuppressScopeIsolationMode.Suppress;
Context._thisBind = new GlobalObject(Context);
Context._strict = body._strict;
var tv = stat.WithLexicalEnvironment ? null : new Dictionary <string, VariableDescriptor>();
body.RebuildScope(stat, tv, body._variables.Length == 0 || !stat.WithLexicalEnvironment ? 1 : 0);
var bd = body as CodeNode;
body.Optimize(ref bd, null, internalCallback, options, stat);
if (tv != null)
{
body._variables = new List <VariableDescriptor>(tv.Values).ToArray();
}
if (stat.NeedDecompose)
{
body.Decompose(ref bd);
}
}
internal void baseOptimize(ref CodeNode _this, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
var f = _left as CodeNode;
var s = _right as CodeNode;
if (f != null)
{
f.Optimize(ref f, owner, message, opts, stats);
_left = f as Expression;
}
if (s != null)
{
s.Optimize(ref s, owner, message, opts, stats);
_right = s as Expression;
}
if (ContextIndependent && !(this is Constant))
{
try
{
_this = new Constant(Evaluate(null));
}
catch (JSException e)
{
_this = new ExpressionWrapper(new Throw(new Constant(e.Error)));
expressionWillThrow(message);
}
catch (Exception e)
{
_this = new ExpressionWrapper(new Throw(e));
expressionWillThrow(message);
}
}
}
public override void Optimize(ref CodeNode _this, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
var vr = _left as VariableReference;
if (vr != null && vr._descriptor.IsDefined)
{
var pd = vr._descriptor.lastPredictedType;
switch (pd)
{
case PredictedType.Int:
case PredictedType.Unknown:
{
vr._descriptor.lastPredictedType = PredictedType.Number;
break;
}
case PredictedType.Double:
{
// кроме как double он ничем больше оказаться не может. Даже NaN это double
break;
}
default:
{
vr._descriptor.lastPredictedType = PredictedType.Ambiguous;
break;
}
}
}
}
public override void Optimize(ref CodeNode _this, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
var bd = _body as CodeNode;
var oldScopeIsolation = _body._suppressScopeIsolation;
_body._suppressScopeIsolation = SuppressScopeIsolationMode.DoNotSuppress;
_body.Optimize(ref bd, this, message, opts, _functionInfo);
_body._suppressScopeIsolation = oldScopeIsolation;
if (_functionInfo.Returns.Count > 0)
{
_functionInfo.ResultType = _functionInfo.Returns[0].ResultType;
for (var i = 1; i < _functionInfo.Returns.Count; i++)
{
if (_functionInfo.ResultType != _functionInfo.Returns[i].ResultType)
{
_functionInfo.ResultType = PredictedType.Ambiguous;
if (message != null &&
_functionInfo.ResultType >= PredictedType.Undefined &&
_functionInfo.Returns[i].ResultType >= PredictedType.Undefined)
{
message(MessageLevel.Warning, new CodeCoordinates(0, parameters[i].references[0].Position, 0), "Type of return value is ambiguous");
}
break;
}
}
}
else
{
_functionInfo.ResultType = PredictedType.Undefined;
}
}
internal void Optimize(ref CodeBlock self, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
CodeNode cn = self;
Optimize(ref cn, owner, message, opts, stats);
self = (CodeBlock)cn;
}
/// <summary>
/// Инициализирует объект типа Script и преобрзует код сценария во внутреннее представление.
/// </summary>
/// <param name="code">Код скрипта на языке JavaScript.</param>
/// <param name="parentContext">Родительский контекст для контекста выполнения сценария.</param>
/// <param name="messageCallback">Делегат обратного вызова, используемый для вывода сообщений компилятора</param>
public Script(string code, Context parentContext, CompilerMessageCallback messageCallback, Options options)
{
if (code == null)
throw new ArgumentNullException();
Code = code;
int i = 0;
root = CodeBlock.Parse(new ParsingState(Tools.RemoveComments(code, 0), Code, messageCallback), ref i).Statement;
if (i < code.Length)
throw new System.ArgumentException("Invalid char");
CompilerMessageCallback icallback = messageCallback != null ? (level, cord, message) =>
{
messageCallback(level, CodeCoordinates.FromTextPosition(code, cord.Column, cord.Length), message);
} : null as CompilerMessageCallback;
var stat = new FunctionStatistics();
Parser.Build(ref root, 0, new System.Collections.Generic.Dictionary<string, VariableDescriptor>(), _BuildState.None, icallback, stat, options);
var body = root as CodeBlock;
Context = new Context(parentContext ?? NiL.JS.Core.Context.globalContext, true, pseudoCaller);
Context.thisBind = new GlobalObject(Context);
Context.variables = (root as CodeBlock).variables;
Context.strict = (root as CodeBlock).strict;
for (i = body.localVariables.Length; i-- > 0; )
{
var f = Context.DefineVariable(body.localVariables[i].name);
body.localVariables[i].cacheRes = f;
body.localVariables[i].cacheContext = Context;
if (body.localVariables[i].Inititalizator != null)
f.Assign(body.localVariables[i].Inititalizator.Evaluate(Context));
if (body.localVariables[i].isReadOnly)
body.localVariables[i].cacheRes.attributes |= JSObjectAttributesInternal.ReadOnly;
body.localVariables[i].captured |= stat.ContainsEval;
}
var bd = body as CodeNode;
body.Optimize(ref bd, null, icallback, options, stat);
}
public override void Optimize(ref CodeNode _this, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
for (var i = 0; i < expressions.Length; i++)
{
expressions[i].Optimize(ref expressions[i], owner, message, opts, stats);
}
}
public override void Optimize(ref CodeNode _this, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
for (int i = 0; i < _initializers.Length; i++)
{
_initializers[i].Optimize(ref _initializers[i], owner, message, opts, stats);
}
}
/// <summary>
/// Initializes a new Module with specified code, callback for output compiler messages and compiler options.
/// </summary>
/// <param name="virtualPath">Path to file with script. Used for resolving paths to other modules for importing via import directive. Can be null or empty</param>
/// <param name="code">JavaScript code.</param>
/// <param name="messageCallback">Callback used to output compiler messages or null</param>
/// <param name="options">Compiler options</param>
public Module(string virtualPath, string code, CompilerMessageCallback messageCallback, Options options)
{
if (code == null)
{
throw new ArgumentNullException();
}
if (!string.IsNullOrWhiteSpace(virtualPath))
{
lock (_modulesCache)
{
if (!_modulesCache.ContainsKey(virtualPath))
{
_modulesCache[virtualPath] = this;
}
}
FilePath = virtualPath;
}
Context = new Context(Context.CurrentGlobalContext, true, null);
Context._module = this;
Context._thisBind = new GlobalObject(Context);
Script = Script.Parse(code, messageCallback, options);
Context._strict = Script.Root._strict;
}
public override void Optimize(ref CodeNode _this, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
var cn = value as CodeNode;
value.Optimize(ref cn, owner, message, opts, stats);
value = cn as Expression;
base.Optimize(ref _this, owner, message, opts, stats);
}
public override void Optimize(ref CodeNode _this, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
_variable.Optimize(ref _variable, owner, message, opts, stats);
_source.Optimize(ref _source, owner, message, opts, stats);
if (_body != null)
{
_body.Optimize(ref _body, owner, message, opts, stats);
}
}
public static Script Parse(string code, CompilerMessageCallback messageCallback = null, Options options = Options.None)
{
if (code == null)
{
throw new ArgumentNullException();
}
if (code == "")
{
return(new Script
{
Root = new CodeBlock(new CodeNode[0]),
Code = ""
});
}
var internalCallback = messageCallback != null ?
(level, position, length, message) => messageCallback(level, CodeCoordinates.FromTextPosition(code, position, length), message)
: null as InternalCompilerMessageCallback;
int i = 0;
var root = (CodeBlock)CodeBlock.Parse(new ParseInfo(Parser.RemoveComments(code, 0), code, internalCallback), ref i);
var stat = new FunctionInfo();
Parser.Build(ref root, 0, new Dictionary <string, VariableDescriptor>(), CodeContext.None, internalCallback, stat, options);
var body = root as CodeBlock;
body._suppressScopeIsolation = SuppressScopeIsolationMode.Suppress;
for (var vi = 0; vi < body._variables.Length; vi++)
{
body._variables[vi].captured = true;
}
var tv = stat.WithLexicalEnvironment ? null : new Dictionary <string, VariableDescriptor>();
body.RebuildScope(stat, tv, body._variables.Length == 0 || !stat.WithLexicalEnvironment ? 1 : 0);
var bd = body as CodeNode;
body.Optimize(ref bd, null, internalCallback, options, stat);
if (tv != null)
{
body._variables = new List <VariableDescriptor>(tv.Values).ToArray();
}
if (stat.NeedDecompose)
{
body.Decompose(ref bd);
}
return(new Script()
{
Code = code, Root = root
});
}
public override void Optimize(ref CodeNode _this, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
base.Optimize(ref _this, owner, message, opts, stats);
for (var i = _arguments.Length; i-- > 0;)
{
var cn = _arguments[i] as CodeNode;
cn.Optimize(ref cn, owner, message, opts, stats);
_arguments[i] = cn as Expression;
}
}
public override void Optimize(ref CodeNode _this, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
base.Optimize(ref _this, owner, message, opts, stats);
if (Tools.IsEqual(_left.ResultType, PredictedType.Number, PredictedType.Group) &&
Tools.IsEqual(_right.ResultType, PredictedType.Number, PredictedType.Group))
{
_this = new NumberAddition(_left, _right);
return;
}
}
public override void Optimize(ref CodeNode _this, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
baseOptimize(ref _this, owner, message, opts, stats);
if (_this == this)
{
if (_left.ResultType == PredictedType.Number && _right.ResultType == PredictedType.Number)
{
_this = new NumberLessOrEqual(_left, _right);
return;
}
}
}
public override void Optimize(ref CodeNode _this, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
for (var i = elements.Length; i-- > 0;)
{
var cn = elements[i] as CodeNode;
if (cn != null)
{
cn.Optimize(ref cn, owner, message, opts, stats);
elements[i] = cn as Expression;
}
}
}
public override void Optimize(ref CodeNode _this, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
_baseClass?.Optimize(ref _baseClass, owner, message, opts, stats);
for (var i = _members.Length; i-- > 0;)
{
_members[i]._value.Optimize(ref _members[i]._value, owner, message, opts, stats);
}
for (var i = 0; i < computedProperties.Length; i++)
{
computedProperties[i]._name.Optimize(ref computedProperties[i]._name, owner, message, opts, stats);
computedProperties[i]._value.Optimize(ref computedProperties[i]._value, owner, message, opts, stats);
}
}
/// <summary>
/// Initializes a new Module with specified code, callback for output compiler messages and compiler options.
/// </summary>
/// <param name="virtualPath">Path to file with script. Used for resolving paths to other modules for importing via import directive. Can be null or empty</param>
/// <param name="code">JavaScript code.</param>
/// <param name="messageCallback">Callback used to output compiler messages or null</param>
/// <param name="options">Compiler options</param>
public Module(string virtualPath, string code, CompilerMessageCallback messageCallback, Options options)
{
if (code == null)
{
throw new ArgumentNullException();
}
Context = new Context(Context.CurrentGlobalContext, true, null);
Context._module = this;
Context._thisBind = new GlobalObject(Context);
Script = Script.Parse(code, messageCallback, options);
Context._strict = Script.Root._strict;
}
public ParseInfo(string code, string sourceCode, CompilerMessageCallback message)
{
Code = code;
SourceCode = sourceCode;
Labels = new List <string>();
AllowDirectives = true;
AllowBreak = new Stack <bool>();
AllowBreak.Push(false);
AllowContinue = new Stack <bool>();
AllowContinue.Push(false);
this.message = message;
stringConstants = new Dictionary <string, JSValue>();
intConstants = new Dictionary <int, JSValue>();
doubleConstants = new Dictionary <double, JSValue>();
Variables = new List <VariableDescriptor>();
}
public override void Optimize(ref CodeNode _this, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
if (_scope != null)
{
_scope.Optimize(ref _scope, owner, message, opts, stats);
}
if (_body != null)
{
_body.Optimize(ref _body, owner, message, opts, stats);
}
if (_body == null)
{
_this = _scope;
}
}
public override void Optimize(ref CodeNode _this, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
base.Optimize(ref _this, owner, message, opts, stats);
for (var i = threads.Length; i-- > 0;)
{
var cn = threads[i] as CodeNode;
cn.Optimize(ref cn, owner, message, opts, stats);
threads[i] = cn as Expression;
}
if (message != null &&
(threads[0] is Variable || threads[0] is Constant) &&
(threads[1] is Variable || threads[1] is Constant) &&
ResultType == PredictedType.Ambiguous)
{
message(MessageLevel.Warning, new CodeCoordinates(0, Position, Length), "Type of an expression is ambiguous");
}
}
public override void Optimize(ref CodeNode _this, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
for (var i = Values.Length; i-- > 0;)
{
var cn = Values[i] as CodeNode;
cn.Optimize(ref cn, owner, message, opts, stats);
Values[i] = cn as Expression;
}
for (var i = 0; i < _computedProperties.Length; i++)
{
var key = _computedProperties[i].Key;
key.Optimize(ref key, owner, message, opts, stats);
var value = _computedProperties[i].Value;
value.Optimize(ref value, owner, message, opts, stats);
_computedProperties[i] = new KeyValuePair <Expression, Expression>(key, value);
}
}
public override void Optimize(ref CodeNode _this, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
if (_initializer != null)
{
_initializer.Optimize(ref _initializer, owner, message, opts, stats);
}
if (_condition != null)
{
_condition.Optimize(ref _condition, owner, message, opts, stats);
}
if (_post != null)
{
_post.Optimize(ref _post, owner, message, opts, stats);
}
if (_body != null)
{
_body.Optimize(ref _body, owner, message, opts, stats);
}
}
public override void Optimize(ref CodeNode _this, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
/*
* Дублирование оптимизации для локальных переменных нужно для правильной работы ряда оптимизаций
*/
if (_variables != null)
{
for (var i = 0; i < _variables.Length; i++)
{
if (_variables[i].initializer != null)
{
var cn = _variables[i].initializer as CodeNode;
cn.Optimize(ref cn, owner, message, opts, stats);
}
}
}
for (int i = 0; i < _lines.Length; i++)
{
var cn = _lines[i] as CodeNode;
cn.Optimize(ref cn, owner, message, opts, stats);
_lines[i] = cn;
}
if (_variables != null)
{
for (var i = 0; i < _variables.Length; i++)
{
if (_variables[i].initializer != null)
{
var cn = _variables[i].initializer as CodeNode;
cn.Optimize(ref cn, owner, message, opts, stats);
}
}
}
if (_lines.Length == 1 && _suppressScopeIsolation == SuppressScopeIsolationMode.Suppress && _variables.Length == 0)
{
_this = _lines[0];
}
}
public ParsingState(string code, string sourceCode, CompilerMessageCallback message)
{
Code = code;
SourceCode = sourceCode;
Labels = new List<string>();
strict = new Stack<bool>();
strict.Push(false);
AllowDirectives = true;
containsWith = new Stack<bool>();
containsWith.Push(false);
AllowBreak = new Stack<bool>();
AllowBreak.Push(false);
AllowContinue = new Stack<bool>();
AllowContinue.Push(false);
AllowYield = new Stack<bool>();
AllowYield.Push(false);
this.message = message;
stringConstants = new Dictionary<string, JSObject>();
intConstants = new Dictionary<int, JSObject>();
doubleConstants = new Dictionary<double, JSObject>();
}
public override void Optimize(ref CodeNode _this, FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
base.Optimize(ref _this, owner, message, opts, stats);
if (message != null)
{
var fc = _left as Constant ?? _right as Constant;
if (fc != null)
{
switch (fc.value._valueType)
{
case JSValueType.Undefined:
message(MessageLevel.Warning, new CodeCoordinates(0, Position, Length), "To compare with undefined use '===' or '!==' instead of '==' or '!='.");
break;
case JSValueType.Object:
if (fc.value._oValue == null)
{
message(MessageLevel.Warning, new CodeCoordinates(0, Position, Length), "To compare with null use '===' or '!==' instead of '==' or '!='.");
}
break;
}
}
}
}
/// <summary>
/// Инициализирует объект типа Script и преобрзует код сценария во внутреннее представление.
/// </summary>
/// <param name="code">Код скрипта на языке JavaScript.</param>
/// <param name="messageCallback">Делегат обратного вызова, используемый для вывода сообщений компилятора</param>
public Script(string code, CompilerMessageCallback messageCallback)
: this(code, null, messageCallback, Options.Default)
{
}
/// <summary>
/// Initializes a new Module with specified code, callback for output compiler messages and compiler options.
/// </summary>
/// <param name="code">JavaScript code.</param>
/// <param name="messageCallback">Callback used to output compiler messages or null</param>
/// <param name="options">Compiler options</param>
public Module(string code, CompilerMessageCallback messageCallback, Options options)
: this(null, code, messageCallback, options)
{
}
/// <summary>
/// Initializes a new Module with specified code and callback for output compiler messages.
/// </summary>
/// <param name="path">Path to file with script. Used for resolving paths to other modules for importing via import directive. Can be null or empty</param>
/// <param name="code">JavaScript code.</param>
/// <param name="messageCallback">Callback used to output compiler messages</param>
public Module(string path, string code, CompilerMessageCallback messageCallback)
: this(path, code, messageCallback, Options.None)
{
}
public override void Optimize(ref CodeNode _this, Expressions.FunctionDefinition owner, CompilerMessageCallback message, Options opts, FunctionInfo stats)
{
original.Optimize(ref _this, owner, message, opts, stats);
}
public override bool Build(ref CodeNode _this, int expressionDepth, Dictionary <string, VariableDescriptor> variables, CodeContext codeContext, CompilerMessageCallback message, FunctionInfo stats, Options opts)
{
return(original.Build(ref _this, expressionDepth, variables, codeContext, message, stats, opts));
}
internal override bool Build(ref CodeNode _this, int depth, Dictionary<string, VariableDescriptor> variables, _BuildState state, CompilerMessageCallback message, FunctionStatistics statistic, Options opts)
{
depth = System.Math.Max(1, depth);
Parser.Build(ref body, depth, variables, state | _BuildState.InLoop, message, statistic, opts);
Parser.Build(ref condition, 2, variables, state | _BuildState.InLoop, message, statistic, opts);
try
{
if (allowRemove
&& (opts & Options.SuppressUselessExpressionsElimination) == 0
&& (condition is Constant || (condition as Expressions.Expression).IsContextIndependent))
{
if ((bool)condition.Evaluate(null))
_this = new InfinityLoop(body, labels);
else if (labels.Length == 0)
_this = body;
condition.Eliminated = true;
}
}
#if PORTABLE
catch
{
internal override void Optimize(ref CodeNode _this, FunctionExpression owner, CompilerMessageCallback message, Options opts, FunctionStatistics statistic)
{
// do nothing
}
internal override bool Build(ref CodeNode _this, int depth, System.Collections.Generic.Dictionary<string, VariableDescriptor> variables, _BuildState state, CompilerMessageCallback message, FunctionStatistics statistic, Options opts)
{
return false;
}
internal override bool Build(ref CodeNode _this, int depth, Dictionary<string, VariableDescriptor> variables, _BuildState state, CompilerMessageCallback message, FunctionStatistics statistic, Options opts)
{
depth = System.Math.Max(1, depth);
Parser.Build(ref body, depth, variables, state | _BuildState.Conditional | _BuildState.InLoop, message, statistic, opts);
Parser.Build(ref condition, 2, variables, state | _BuildState.InLoop, message, statistic, opts);
if ((opts & Options.SuppressUselessExpressionsElimination) == 0 && condition is ToBool)
{
if (message == null)
message(MessageLevel.Warning, new CodeCoordinates(0, condition.Position, 2), "Useless conversion. Remove double negation in condition");
condition = (condition as Expression).first;
}
try
{
if (allowRemove && (condition is Constant || (condition is Expression && (condition as Expression).IsContextIndependent)))
{
if ((bool)condition.Evaluate(null))
{
if ((opts & Options.SuppressUselessExpressionsElimination) == 0)
_this = new InfinityLoop(body, labels);
}
else if ((opts & Options.SuppressUselessStatementsElimination) == 0)
{
_this = null;
Eliminated = true;
body.Eliminated = true;
}
condition.Eliminated = true;
}
else if ((opts & Options.SuppressUselessExpressionsElimination) == 0
&& ((condition is Json && (condition as Json).Fields.Length == 0)
|| (condition is ArrayExpression && (condition as ArrayExpression).Elements.Count == 0)))
{
_this = new InfinityLoop(body, labels);
condition.Eliminated = true;
}
}
#if PORTABLE
catch
{
