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operators.go
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package pgtalk
import (
"fmt"
"strings"
)
const (
validComparisonOperators = "= > < >= <= <>"
)
type binaryExpression struct {
Operator string
Left SQLExpression
Right SQLExpression
}
func (o binaryExpression) SQLOn(w WriteContext) {
fmt.Fprint(w, "(")
o.Left.SQLOn(w)
// inline comparison operators
if strings.Contains(validComparisonOperators, o.Operator) {
fmt.Fprintf(w, " ")
} else {
fmt.Fprintf(w, "\n\t")
}
fmt.Fprintf(w, "%s ", o.Operator)
o.Right.SQLOn(w)
fmt.Fprint(w, ")")
}
func makeBinaryOperator(left SQLExpression, operator string, right SQLExpression) binaryExpression {
return binaryExpression{
Left: left,
Operator: operator,
Right: right,
}
}
func (o binaryExpression) And(right SQLExpression) SQLExpression {
return binaryExpression{
Left: o,
Operator: "AND",
Right: right,
}
}
func (o binaryExpression) Or(right SQLExpression) SQLExpression {
return binaryExpression{
Left: o,
Operator: "OR",
Right: right,
}
}
func (o binaryExpression) Like(pattern string) SQLExpression {
return binaryExpression{
Left: o,
Operator: "LIKE",
Right: valuePrinter{v: pattern},
}
}
type betweenAnd struct {
}
func makeBetweenAnd(_ ColumnAccessor, _, _ SQLExpression) betweenAnd { return betweenAnd{} }
type unaryExpression struct {
Operator string
Operand SQLExpression
}
func (u unaryExpression) SQLOn(w WriteContext) {
fmt.Fprintf(w, "%s (", u.Operator)
u.Operand.SQLOn(w)
fmt.Fprint(w, ")")
}
func (u unaryExpression) And(right SQLExpression) SQLExpression {
return binaryExpression{
Left: u,
Operator: "AND",
Right: right,
}
}
func (u unaryExpression) Or(right SQLExpression) SQLExpression {
return binaryExpression{
Left: u,
Operator: "OR",
Right: right,
}
}
type nullCheck struct {
Operand SQLExpression
// IsNot == true -> IS NOT NULL
IsNot bool
}
func (n nullCheck) SQLOn(w WriteContext) {
fmt.Fprint(w, "(")
n.Operand.SQLOn(w)
if n.IsNot {
fmt.Fprint(w, " IS NOT NULL)")
return
}
fmt.Fprint(w, " IS NULL)")
}
func (n nullCheck) And(right SQLExpression) SQLExpression {
return makeBinaryOperator(n, "AND", right)
}
func (n nullCheck) Or(right SQLExpression) SQLExpression {
return makeBinaryOperator(n, "OR", right)
}
// IsNotNull returns an expression with the IS NOT NULL condition
func IsNotNull(e SQLExpression) nullCheck {
return nullCheck{Operand: e, IsNot: true}
}
// IsNull returns an expression with the IS NULL condition
func IsNull(e SQLExpression) nullCheck {
return nullCheck{Operand: e, IsNot: false}
}
type constantExpression struct {
v any
}
func makeConstantExpression(v any) constantExpression {
return constantExpression{v: v}
}
func (c constantExpression) SQLOn(w WriteContext) {
makeValuePrinter(c.v).SQLOn(w)
}
func (c constantExpression) Or(right SQLExpression) SQLExpression {
return makeBinaryOperator(c, "OR", right)
}
func (c constantExpression) And(right SQLExpression) SQLExpression {
return makeBinaryOperator(c, "AND", right)
}