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Simplified creation of operator expression.

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This commit is contained in:
go-jet 2019-12-07 18:52:46 +01:00
parent a2fbc4f53a
commit 57aa62f483
6 changed files with 75 additions and 102 deletions
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53
internal/jet/bool_expression.go
View file

@ -53,80 +53,53 @@ func (b *boolInterfaceImpl) IS_NOT_DISTINCT_FROM(rhs BoolExpression) BoolExpress
}
func (b *boolInterfaceImpl) AND(expression BoolExpression) BoolExpression {
return newBinaryBoolOperator(b.parent, expression, "AND")
return newBinaryBoolOperatorExpression(b.parent, expression, "AND")
}
func (b *boolInterfaceImpl) OR(expression BoolExpression) BoolExpression {
return newBinaryBoolOperator(b.parent, expression, "OR")
return newBinaryBoolOperatorExpression(b.parent, expression, "OR")
}
func (b *boolInterfaceImpl) IS_TRUE() BoolExpression {
return newPostifxBoolExpression(b.parent, "IS TRUE")
return newPostfixBoolOperatorExpression(b.parent, "IS TRUE")
}
func (b *boolInterfaceImpl) IS_NOT_TRUE() BoolExpression {
return newPostifxBoolExpression(b.parent, "IS NOT TRUE")
return newPostfixBoolOperatorExpression(b.parent, "IS NOT TRUE")
}
func (b *boolInterfaceImpl) IS_FALSE() BoolExpression {
return newPostifxBoolExpression(b.parent, "IS FALSE")
return newPostfixBoolOperatorExpression(b.parent, "IS FALSE")
}
func (b *boolInterfaceImpl) IS_NOT_FALSE() BoolExpression {
return newPostifxBoolExpression(b.parent, "IS NOT FALSE")
return newPostfixBoolOperatorExpression(b.parent, "IS NOT FALSE")
}
func (b *boolInterfaceImpl) IS_UNKNOWN() BoolExpression {
return newPostifxBoolExpression(b.parent, "IS UNKNOWN")
return newPostfixBoolOperatorExpression(b.parent, "IS UNKNOWN")
}
func (b *boolInterfaceImpl) IS_NOT_UNKNOWN() BoolExpression {
return newPostifxBoolExpression(b.parent, "IS NOT UNKNOWN")
return newPostfixBoolOperatorExpression(b.parent, "IS NOT UNKNOWN")
}
//---------------------------------------------------//
func newBinaryBoolOperator(lhs, rhs Expression, operator string, additionalParams ...Expression) BoolExpression {
func newBinaryBoolOperatorExpression(lhs, rhs Expression, operator string, additionalParams ...Expression) BoolExpression {
return BoolExp(newBinaryOperatorExpression(lhs, rhs, operator, additionalParams...))
}
//---------------------------------------------------//
type prefixBoolExpression struct {
ExpressionInterfaceImpl
boolInterfaceImpl
prefixOpExpression
}
func newPrefixBoolOperator(expression Expression, operator string) BoolExpression {
exp := prefixBoolExpression{}
exp.prefixOpExpression = newPrefixExpression(expression, operator)
exp.ExpressionInterfaceImpl.Parent = &exp
exp.boolInterfaceImpl.parent = &exp
return &exp
func newPrefixBoolOperatorExpression(expression Expression, operator string) BoolExpression {
return BoolExp(newPrefixOperatorExpression(expression, operator))
}
//---------------------------------------------------//
type postfixBoolOpExpression struct {
ExpressionInterfaceImpl
boolInterfaceImpl
postfixOpExpression
}
func newPostifxBoolExpression(expression Expression, operator string) BoolExpression {
exp := postfixBoolOpExpression{}
exp.postfixOpExpression = newPostfixOpExpression(expression, operator)
exp.ExpressionInterfaceImpl.Parent = &exp
exp.boolInterfaceImpl.parent = &exp
return &exp
func newPostfixBoolOperatorExpression(expression Expression, operator string) BoolExpression {
return BoolExp(newPostfixOperatorExpression(expression, operator))
}
//---------------------------------------------------//
type boolExpressionWrapper struct {
boolInterfaceImpl
Expression

29
internal/jet/expression.go
View file

@ -36,19 +36,19 @@ func (e *ExpressionInterfaceImpl) fromImpl(subQuery SelectTable) Projection {
}
func (e *ExpressionInterfaceImpl) IS_NULL() BoolExpression {
return newPostifxBoolExpression(e.Parent, "IS NULL")
return newPostfixBoolOperatorExpression(e.Parent, "IS NULL")
}
func (e *ExpressionInterfaceImpl) IS_NOT_NULL() BoolExpression {
return newPostifxBoolExpression(e.Parent, "IS NOT NULL")
return newPostfixBoolOperatorExpression(e.Parent, "IS NOT NULL")
}
func (e *ExpressionInterfaceImpl) IN(expressions ...Expression) BoolExpression {
return newBinaryBoolOperator(e.Parent, WRAP(expressions...), "IN")
return newBinaryBoolOperatorExpression(e.Parent, WRAP(expressions...), "IN")
}
func (e *ExpressionInterfaceImpl) NOT_IN(expressions ...Expression) BoolExpression {
return newBinaryBoolOperator(e.Parent, WRAP(expressions...), "NOT IN")
return newBinaryBoolOperatorExpression(e.Parent, WRAP(expressions...), "NOT IN")
}
func (e *ExpressionInterfaceImpl) AS(alias string) Projection {
@ -129,21 +129,24 @@ func (c *binaryOperatorExpression) serialize(statement StatementType, out *SQLBu
}
// A prefix operator Expression
type prefixOpExpression struct {
type prefixExpression struct {
ExpressionInterfaceImpl
expression Expression
operator string
}
func newPrefixExpression(expression Expression, operator string) prefixOpExpression {
prefixExpression := prefixOpExpression{
func newPrefixOperatorExpression(expression Expression, operator string) *prefixExpression {
prefixExpression := &prefixExpression{
expression: expression,
operator: operator,
}
prefixExpression.ExpressionInterfaceImpl.Parent = prefixExpression
return prefixExpression
}
func (p *prefixOpExpression) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
func (p *prefixExpression) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
out.WriteString("(")
out.WriteString(p.operator)
@ -156,18 +159,22 @@ func (p *prefixOpExpression) serialize(statement StatementType, out *SQLBuilder,
out.WriteString(")")
}
// A postifx operator Expression
// A postfix operator Expression
type postfixOpExpression struct {
ExpressionInterfaceImpl
expression Expression
operator string
}
func newPostfixOpExpression(expression Expression, operator string) postfixOpExpression {
postfixOpExpression := postfixOpExpression{
func newPostfixOperatorExpression(expression Expression, operator string) *postfixOpExpression {
postfixOpExpression := &postfixOpExpression{
expression: expression,
operator: operator,
}
postfixOpExpression.ExpressionInterfaceImpl.Parent = postfixOpExpression
return postfixOpExpression
}

39
internal/jet/integer_expression.go
View file

@ -86,23 +86,23 @@ func (i *integerInterfaceImpl) LT_EQ(expression IntegerExpression) BoolExpressio
}
func (i *integerInterfaceImpl) ADD(expression IntegerExpression) IntegerExpression {
return newBinaryIntegerExpression(i.parent, expression, "+")
return newBinaryIntegerOperatorExpression(i.parent, expression, "+")
}
func (i *integerInterfaceImpl) SUB(expression IntegerExpression) IntegerExpression {
return newBinaryIntegerExpression(i.parent, expression, "-")
return newBinaryIntegerOperatorExpression(i.parent, expression, "-")
}
func (i *integerInterfaceImpl) MUL(expression IntegerExpression) IntegerExpression {
return newBinaryIntegerExpression(i.parent, expression, "*")
return newBinaryIntegerOperatorExpression(i.parent, expression, "*")
}
func (i *integerInterfaceImpl) DIV(expression IntegerExpression) IntegerExpression {
return newBinaryIntegerExpression(i.parent, expression, "/")
return newBinaryIntegerOperatorExpression(i.parent, expression, "/")
}
func (i *integerInterfaceImpl) MOD(expression IntegerExpression) IntegerExpression {
return newBinaryIntegerExpression(i.parent, expression, "%")
return newBinaryIntegerOperatorExpression(i.parent, expression, "%")
}
func (i *integerInterfaceImpl) POW(expression IntegerExpression) IntegerExpression {
@ -110,46 +110,33 @@ func (i *integerInterfaceImpl) POW(expression IntegerExpression) IntegerExpressi
}
func (i *integerInterfaceImpl) BIT_AND(expression IntegerExpression) IntegerExpression {
return newBinaryIntegerExpression(i.parent, expression, "&")
return newBinaryIntegerOperatorExpression(i.parent, expression, "&")
}
func (i *integerInterfaceImpl) BIT_OR(expression IntegerExpression) IntegerExpression {
return newBinaryIntegerExpression(i.parent, expression, "|")
return newBinaryIntegerOperatorExpression(i.parent, expression, "|")
}
func (i *integerInterfaceImpl) BIT_XOR(expression IntegerExpression) IntegerExpression {
return newBinaryIntegerExpression(i.parent, expression, "#")
return newBinaryIntegerOperatorExpression(i.parent, expression, "#")
}
func (i *integerInterfaceImpl) BIT_SHIFT_LEFT(intExpression IntegerExpression) IntegerExpression {
return newBinaryIntegerExpression(i.parent, intExpression, "<<")
return newBinaryIntegerOperatorExpression(i.parent, intExpression, "<<")
}
func (i *integerInterfaceImpl) BIT_SHIFT_RIGHT(intExpression IntegerExpression) IntegerExpression {
return newBinaryIntegerExpression(i.parent, intExpression, ">>")
return newBinaryIntegerOperatorExpression(i.parent, intExpression, ">>")
}
//---------------------------------------------------//
func newBinaryIntegerExpression(lhs, rhs IntegerExpression, operator string) IntegerExpression {
func newBinaryIntegerOperatorExpression(lhs, rhs IntegerExpression, operator string) IntegerExpression {
return IntExp(newBinaryOperatorExpression(lhs, rhs, operator))
}
//---------------------------------------------------//
type prefixIntegerOpExpression struct {
ExpressionInterfaceImpl
integerInterfaceImpl
prefixOpExpression
}
func newPrefixIntegerOperator(expression IntegerExpression, operator string) IntegerExpression {
integerExpression := prefixIntegerOpExpression{}
integerExpression.prefixOpExpression = newPrefixExpression(expression, operator)
integerExpression.ExpressionInterfaceImpl.Parent = &integerExpression
integerExpression.integerInterfaceImpl.parent = &integerExpression
return &integerExpression
func newPrefixIntegerOperatorExpression(expression IntegerExpression, operator string) IntegerExpression {
return IntExp(newPrefixOperatorExpression(expression, operator))
}
//---------------------------------------------------//

22
internal/jet/operators.go
View file

@ -11,7 +11,7 @@ const (
// NOT returns negation of bool expression result
func NOT(exp BoolExpression) BoolExpression {
return newPrefixBoolOperator(exp, "NOT")
return newPrefixBoolOperatorExpression(exp, "NOT")
}
// BIT_NOT inverts every bit in integer expression result
@ -19,52 +19,52 @@ func BIT_NOT(expr IntegerExpression) IntegerExpression {
if literalExp, ok := expr.(LiteralExpression); ok {
literalExp.SetConstant(true)
}
return newPrefixIntegerOperator(expr, "~")
return newPrefixIntegerOperatorExpression(expr, "~")
}
//----------- Comparison operators ---------------//
// EXISTS checks for existence of the rows in subQuery
func EXISTS(subQuery Expression) BoolExpression {
return newPrefixBoolOperator(subQuery, "EXISTS")
return newPrefixBoolOperatorExpression(subQuery, "EXISTS")
}
// Returns a representation of "a=b"
func eq(lhs, rhs Expression) BoolExpression {
return newBinaryBoolOperator(lhs, rhs, "=")
return newBinaryBoolOperatorExpression(lhs, rhs, "=")
}
// Returns a representation of "a!=b"
func notEq(lhs, rhs Expression) BoolExpression {
return newBinaryBoolOperator(lhs, rhs, "!=")
return newBinaryBoolOperatorExpression(lhs, rhs, "!=")
}
func isDistinctFrom(lhs, rhs Expression) BoolExpression {
return newBinaryBoolOperator(lhs, rhs, "IS DISTINCT FROM")
return newBinaryBoolOperatorExpression(lhs, rhs, "IS DISTINCT FROM")
}
func isNotDistinctFrom(lhs, rhs Expression) BoolExpression {
return newBinaryBoolOperator(lhs, rhs, "IS NOT DISTINCT FROM")
return newBinaryBoolOperatorExpression(lhs, rhs, "IS NOT DISTINCT FROM")
}
// Returns a representation of "a<b"
func lt(lhs Expression, rhs Expression) BoolExpression {
return newBinaryBoolOperator(lhs, rhs, "<")
return newBinaryBoolOperatorExpression(lhs, rhs, "<")
}
// Returns a representation of "a<=b"
func ltEq(lhs, rhs Expression) BoolExpression {
return newBinaryBoolOperator(lhs, rhs, "<=")
return newBinaryBoolOperatorExpression(lhs, rhs, "<=")
}
// Returns a representation of "a>b"
func gt(lhs, rhs Expression) BoolExpression {
return newBinaryBoolOperator(lhs, rhs, ">")
return newBinaryBoolOperatorExpression(lhs, rhs, ">")
}
// Returns a representation of "a>=b"
func gtEq(lhs, rhs Expression) BoolExpression {
return newBinaryBoolOperator(lhs, rhs, ">=")
return newBinaryBoolOperatorExpression(lhs, rhs, ">=")
}
// --------------- CASE operator -------------------//

20
internal/jet/string_expression.go
View file

@ -60,35 +60,27 @@ func (s *stringInterfaceImpl) LT_EQ(rhs StringExpression) BoolExpression {
}
func (s *stringInterfaceImpl) CONCAT(rhs Expression) StringExpression {
return newBinaryStringExpression(s.parent, rhs, StringConcatOperator)
return newBinaryStringOperatorExpression(s.parent, rhs, StringConcatOperator)
}
func (s *stringInterfaceImpl) LIKE(pattern StringExpression) BoolExpression {
return newBinaryBoolOperator(s.parent, pattern, "LIKE")
return newBinaryBoolOperatorExpression(s.parent, pattern, "LIKE")
}
func (s *stringInterfaceImpl) NOT_LIKE(pattern StringExpression) BoolExpression {
return newBinaryBoolOperator(s.parent, pattern, "NOT LIKE")
return newBinaryBoolOperatorExpression(s.parent, pattern, "NOT LIKE")
}
func (s *stringInterfaceImpl) REGEXP_LIKE(pattern StringExpression, caseSensitive ...bool) BoolExpression {
return newBinaryBoolOperator(s.parent, pattern, StringRegexpLikeOperator, Bool(len(caseSensitive) > 0 && caseSensitive[0]))
return newBinaryBoolOperatorExpression(s.parent, pattern, StringRegexpLikeOperator, Bool(len(caseSensitive) > 0 && caseSensitive[0]))
}
func (s *stringInterfaceImpl) NOT_REGEXP_LIKE(pattern StringExpression, caseSensitive ...bool) BoolExpression {
return newBinaryBoolOperator(s.parent, pattern, StringNotRegexpLikeOperator, Bool(len(caseSensitive) > 0 && caseSensitive[0]))
return newBinaryBoolOperatorExpression(s.parent, pattern, StringNotRegexpLikeOperator, Bool(len(caseSensitive) > 0 && caseSensitive[0]))
}
//---------------------------------------------------//
type binaryStringExpression struct {
ExpressionInterfaceImpl
stringInterfaceImpl
binaryOperatorExpression
}
func newBinaryStringExpression(lhs, rhs Expression, operator string) StringExpression {
func newBinaryStringOperatorExpression(lhs, rhs Expression, operator string) StringExpression {
return StringExp(newBinaryOperatorExpression(lhs, rhs, operator))
}