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exp/alias.go

@@ -0,0 +1,60 @@
+package exp
+
+import "fmt"
+
+type (
+	aliasExpression struct {
+		aliased Expression
+		alias   IdentifierExpression
+	}
+)
+
+// Creates a new AliasedExpression for the Expression and alias
+func NewAliasExpression(exp Expression, alias interface{}) AliasedExpression {
+	switch v := alias.(type) {
+	case string:
+		return aliasExpression{aliased: exp, alias: ParseIdentifier(v)}
+	case IdentifierExpression:
+		return aliasExpression{aliased: exp, alias: v}
+	default:
+		panic(fmt.Sprintf("Cannot create alias from %+v", v))
+	}
+}
+
+func (ae aliasExpression) Clone() Expression {
+	return NewAliasExpression(ae.aliased, ae.alias.Clone())
+}
+
+func (ae aliasExpression) Expression() Expression {
+	return ae
+}
+
+func (ae aliasExpression) Aliased() Expression {
+	return ae.aliased
+}
+
+func (ae aliasExpression) GetAs() IdentifierExpression {
+	return ae.alias
+}
+
+// Returns a new IdentifierExpression with the specified schema
+func (ae aliasExpression) Schema(schema string) IdentifierExpression {
+	return ae.alias.Schema(schema)
+}
+
+// Returns a new IdentifierExpression with the specified table
+func (ae aliasExpression) Table(table string) IdentifierExpression {
+	return ae.alias.Table(table)
+}
+
+// Returns a new IdentifierExpression with the specified column
+func (ae aliasExpression) Col(col interface{}) IdentifierExpression {
+	return ae.alias.Col(col)
+}
+
+// Returns a new IdentifierExpression with the column set to *
+//
+//	I("my_table").As("t").All() //"t".*
+func (ae aliasExpression) All() IdentifierExpression {
+	return ae.alias.All()
+}