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