public T Visit(DestructuredObjectExpression expression)
{
if (expression.Initializer != null)
{
expression.Initializer.Accept(this);
}
return(default(T));
}
public override Expression Visit(DestructuredObjectExpression expression)
{
foreach (var field in expression.Fields)
{
_scope.Define(field.Alias ?? field.Name, false);
}
return(base.Visit(expression));
}
public virtual Expression Visit(DestructuredObjectExpression expression)
{
var initializer = expression.Initializer != null?expression.Initializer.Accept(this) : null;
return(new DestructuredObjectExpression(expression.Token, expression.Fields, initializer, expression.IsReadOnly)
{
EndToken = expression.EndToken
});
}
public Expression Parse(Parser parser, Token token, out bool trailingSemicolon)
{
trailingSemicolon = false;
parser.Take(TokenType.LeftParen);
var varToken = parser.Take(TokenType.Var);
Token inToken;
Expression declaration;
Expression expression;
BlockExpression block;
if (parser.MatchAndTake(TokenType.LeftBrace))
{
var fields = VarParselet.ParseObjectDestructuring(parser);
inToken = parser.Take(TokenType.In);
expression = parser.ParseExpression();
declaration = new DestructuredObjectExpression(varToken, fields, null, false);
parser.Take(TokenType.RightParen);
block = parser.ParseBlock();
return(new ForeachExpression(token, inToken, "input", expression, block, declaration));
}
if (parser.MatchAndTake(TokenType.LeftSquare))
{
var indices = VarParselet.ParseArrayDestructuring(parser);
inToken = parser.Take(TokenType.In);
expression = parser.ParseExpression();
declaration = new DestructuredArrayExpression(varToken, indices, null, false);
parser.Take(TokenType.RightParen);
block = parser.ParseBlock();
return(new ForeachExpression(token, inToken, "input", expression, block, declaration));
}
var identifier = parser.Take(TokenType.Identifier).Contents;
inToken = parser.Take(TokenType.In);
expression = parser.ParseExpression();
parser.Take(TokenType.RightParen);
block = parser.ParseBlock();
return(new ForeachExpression(token, inToken, identifier, expression, block));
}
public Expression Parse(Parser parser, Token token, out bool trailingSemicolon)
{
trailingSemicolon = false;
parser.Take(TokenType.LeftParen);
var varToken = parser.Take(TokenType.Var);
Token inToken;
Expression declaration;
Expression expression;
BlockExpression block;
if (parser.MatchAndTake(TokenType.LeftBrace))
{
var fields = VarParselet.ParseObjectDestructuring(parser);
inToken = parser.Take(TokenType.In);
expression = parser.ParseExpression();
declaration = new DestructuredObjectExpression(varToken, fields, null, false);
parser.Take(TokenType.RightParen);
block = parser.ParseBlock();
return new ForeachExpression(token, inToken, "input", expression, block, declaration);
}
if (parser.MatchAndTake(TokenType.LeftSquare))
{
var indices = VarParselet.ParseArrayDestructuring(parser);
inToken = parser.Take(TokenType.In);
expression = parser.ParseExpression();
declaration = new DestructuredArrayExpression(varToken, indices, null, false);
parser.Take(TokenType.RightParen);
block = parser.ParseBlock();
return new ForeachExpression(token, inToken, "input", expression, block, declaration);
}
var identifier = parser.Take(TokenType.Identifier).Contents;
inToken = parser.Take(TokenType.In);
expression = parser.ParseExpression();
parser.Take(TokenType.RightParen);
block = parser.ParseBlock();
return new ForeachExpression(token, inToken, identifier, expression, block);
}
public int Visit(DestructuredObjectExpression expression)
{
_writer.Write("{0} {{ ", expression.IsReadOnly ? "const" : "var");
var fields = expression.Fields.Select(field => field.Alias != null ? string.Format("{0}: {1}", field.Name, field.Alias) : field.Name).ToArray();
_writer.Write(string.Join(", ", fields));
_writer.Write(" }");
if (expression.Initializer != null)
{
_writer.Write(" = ");
expression.Initializer.Accept(this);
}
return(0);
}
