private static SubProduction AndRule()
{
return(new SubProduction
(
new List <ExpressionDefinition>
{
new NonTerminalExpressionDefinition {
Identifier = ParserConstants.BooleanExpression
},
new TerminalExpressionDefinition {
TokenType = TokenType.And
},
new NonTerminalExpressionDefinition {
Key = "BooleanExpression2", Identifier = ParserConstants.BooleanExpression
},
new SemanticActionDefinition((ParsingNode node) =>
{
BooleanExpressionASTNode left = node.GetAttributeForKey <BooleanExpressionASTNode>(ParserConstants.BooleanExpression, ParserConstants.SyntaxTreeNode);
BooleanExpressionASTNode right = node.GetAttributeForKey <BooleanExpressionASTNode>("BooleanExpression2", ParserConstants.SyntaxTreeNode);
AndASTNode syntaxTreeNode = new AndASTNode(left, right);
node.Attributes.Add(ParserConstants.SyntaxTreeNode, syntaxTreeNode);
})
}
));
}
private static SubProduction GetSelectRule()
{
return(new SubProduction
(
new List <ExpressionDefinition>
{
new TerminalExpressionDefinition {
TokenType = TokenType.Select
},
new NonTerminalExpressionDefinition {
Identifier = ParserConstants.Top
},
new NonTerminalExpressionDefinition {
Identifier = ParserConstants.SelectColumns
},
new TerminalExpressionDefinition {
TokenType = TokenType.From
},
new NonTerminalExpressionDefinition {
Identifier = ParserConstants.Identifier
},
new NonTerminalExpressionDefinition {
Identifier = ParserConstants.Join
},
new NonTerminalExpressionDefinition {
Identifier = ParserConstants.Where
},
new SemanticActionDefinition((ParsingNode node) =>
{
IdentifierASTNode identifier = node.GetAttributeForKey <IdentifierASTNode>(ParserConstants.Identifier, ParserConstants.SyntaxTreeNode);
BooleanExpressionASTNode condition = node.GetAttributeForKey <BooleanExpressionASTNode>(ParserConstants.Where, ParserConstants.SyntaxTreeNode);
JoinASTNode join = node.GetAttributeForKey <JoinASTNode>(ParserConstants.Join, ParserConstants.SyntaxTreeNode);
TopASTNode top = node.GetAttributeForKey <TopASTNode>(ParserConstants.Top, ParserConstants.SyntaxTreeNode);
FromASTNode from = new FromASTNode()
{
Identifier = identifier
};
node.Attributes.Add(ParserConstants.SyntaxTreeNode, new SelectASTNode()
{
From = from,
Condition = condition,
Join = join,
Top = top,
SelectColumns = node.GetAttributeForKey <List <FactorASTNode> >(ParserConstants.SelectColumns, ParserConstants.SyntaxTreeNodes)
});
})
}
));
}
private Condition BooleanExpressionToCondition(TableDefinition mainTable, BooleanExpressionASTNode expr)
{
if (expr is AndASTNode andNode)
{
Condition c = new AndCondition()
{
Left = BooleanExpressionToCondition(mainTable, andNode.Left),
Right = BooleanExpressionToCondition(mainTable, andNode.Right),
};
return(c);
}
else if (expr is OrASTNode orNode)
{
Condition c = new OrCondition()
{
Left = BooleanExpressionToCondition(mainTable, orNode.Left),
Right = BooleanExpressionToCondition(mainTable, orNode.Right),
};
return(c);
}
else if (expr is RelOpASTNode relopNode)
{
AttributeDefinition attributeDefinition = null;
if (relopNode.Left is IdentifierASTNode)
{
attributeDefinition = GetColumnFromIdentifierNode(mainTable, (IdentifierASTNode)relopNode.Left);
}
else if (relopNode.Right is IdentifierASTNode)
{
attributeDefinition = GetColumnFromIdentifierNode(mainTable, (IdentifierASTNode)relopNode.Right);
}
object value = GetValueFromConditionASTNode(relopNode.Right) ?? GetValueFromConditionASTNode(relopNode.Left);
return(new LeafCondition
{
Column = attributeDefinition,
Operation = relopNode.RelationOperator,
Value = value
});
}
return(null);
}
private static SubProduction GetWhereRule()
{
return(new SubProduction
(
new List <ExpressionDefinition>
{
new TerminalExpressionDefinition {
TokenType = TokenType.Where
},
new NonTerminalExpressionDefinition {
Identifier = ParserConstants.BooleanExpression
},
new SemanticActionDefinition((ParsingNode node) =>
{
BooleanExpressionASTNode condition = node.GetAttributeForKey <BooleanExpressionASTNode>(ParserConstants.BooleanExpression, ParserConstants.SyntaxTreeNode);
node.Attributes.Add(ParserConstants.SyntaxTreeNode, condition);
})
}
));
}