public LetStatement ParseLetStatement()
{
var statement = new LetStatement();
statement.Token = this.CurrentToken;
if (!this.ExpectPeek(TokenType.IDENT))
{
return(null);
}
statement.Name = new Identifier(this.CurrentToken, this.CurrentToken.Literal);
if (!this.ExpectPeek(TokenType.ASSIGN))
{
return(null);
}
while (this.CurrentToken.Type != TokenType.SEMICOLON)
{
this.ReadToken();
}
return(statement);
}
private LetStatement ParseAssignmentOperatorStatement()
{
var statement = new LetStatement(new Token(Token.Let, "let"));
var ident = new Identifier(_current)
{
Value = _current.Literal
};
statement.Name = ident;
statement.Value = AssignmentOperatorInfixExpression(ident);
if (PeekTokenIs(Token.Semicolon))
{
NextToken();
}
return(statement);
}
private LetStatement ParseLetStatement()
{
var statement = new LetStatement(_current);
if (!ExpectPeek(Token.Ident))
{
return(null);
}
statement.Name = new Identifier(_current)
{
Value = _current.Literal
};
if (PeekTokenIsAssignmentOperator())
{
statement.Value = AssignmentOperatorInfixExpression(statement.Name);
}
else
{
if (!ExpectPeek(Token.Assign))
{
return(null);
}
NextToken();
statement.Value = ParseExpression(Lowest);
}
if (PeekTokenIs(Token.Semicolon))
{
NextToken();
}
return(statement);
}