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function.go
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function.go
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package dialect
import (
"io"
"github.com/stephenafamo/bob"
"github.com/stephenafamo/bob/clause"
"github.com/stephenafamo/bob/expr"
)
func NewFunction(name string, args ...any) Function {
return Function{name: name, args: args}
}
type Function struct {
name string
args []any
// Used in value functions. Supported by Sqlite and Postgres
filter []any
// For chain methods
expr.Chain[Expression, Expression]
}
// A function can be a target for a query
func (f *Function) Apply(q *clause.From) {
q.Table = f
}
func (f *Function) Filter(e ...any) *Function {
f.filter = append(f.filter, e...)
return f
}
func (f *Function) Over() *functionOver {
fo := &functionOver{
function: f,
}
fo.WindowChain = &WindowChain[*functionOver]{Wrap: fo}
fo.Base = fo
return fo
}
func (f Function) WriteSQL(w io.Writer, d bob.Dialect, start int) ([]any, error) {
if f.name == "" {
return nil, nil
}
w.Write([]byte(f.name))
w.Write([]byte("("))
args, err := bob.ExpressSlice(w, d, start, f.args, "", ", ", "")
if err != nil {
return nil, err
}
w.Write([]byte(")"))
filterArgs, err := bob.ExpressSlice(w, d, start, f.filter, " FILTER (WHERE ", " AND ", ")")
if err != nil {
return nil, err
}
args = append(args, filterArgs...)
return args, nil
}
type functionOver struct {
function *Function
*WindowChain[*functionOver]
expr.Chain[Expression, Expression]
}
func (wr *functionOver) WriteSQL(w io.Writer, d bob.Dialect, start int) ([]any, error) {
fargs, err := bob.Express(w, d, start, wr.function)
if err != nil {
return nil, err
}
winargs, err := bob.ExpressIf(w, d, start+len(fargs), wr.def, true, "OVER (", ")")
if err != nil {
return nil, err
}
return append(fargs, winargs...), nil
}