54 lines
1.2 KiB
Go
54 lines
1.2 KiB
Go
// Copyright (c) 2024-2026 Celestino Amoroso (celestino.amoroso@gmail.com).
|
|
// All rights reserved.
|
|
|
|
// operand-selector-case.go
|
|
package expr
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
|
|
"git.portale-stac.it/go-pkg/expr/kern"
|
|
"git.portale-stac.it/go-pkg/expr/scan"
|
|
)
|
|
|
|
// -------- selector case term
|
|
|
|
type selectorCase struct {
|
|
filterList *scan.Term
|
|
caseExpr kern.Expr
|
|
}
|
|
|
|
func (sc *selectorCase) String() string {
|
|
var sb strings.Builder
|
|
if sc.filterList != nil {
|
|
sc.filterList.ToString(&sb)
|
|
sb.WriteByte(' ')
|
|
}
|
|
sb.WriteByte('{')
|
|
sb.WriteString(sc.caseExpr.String())
|
|
sb.WriteByte('}')
|
|
return sb.String()
|
|
}
|
|
|
|
func newSelectorCaseTerm(row, col int, filterList *scan.Term, caseExpr kern.Expr) *scan.Term {
|
|
tk := scan.NewValueToken(row, col, scan.SymSelectorCase, "", &selectorCase{filterList: filterList, caseExpr: caseExpr})
|
|
return &scan.Term{
|
|
Tk: *tk,
|
|
Parent: nil,
|
|
Children: nil,
|
|
Position: scan.PosLeaf,
|
|
Priority: scan.PriValue,
|
|
EvalFunc: evalSelectorCase,
|
|
}
|
|
}
|
|
|
|
// -------- eval selector case
|
|
func evalSelectorCase(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
|
|
var ok bool
|
|
if v, ok = opTerm.Value().(*selectorCase); !ok {
|
|
err = fmt.Errorf("selector-case expected, got %T", opTerm.Value())
|
|
}
|
|
return
|
|
}
|