70 lines
1.5 KiB
Go
70 lines
1.5 KiB
Go
// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
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// All rights reserved.
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// operator-builtin.go
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package expr
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import (
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"io"
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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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//-------- builtin term
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func newBuiltinTerm(tk *scan.Token) (inst *scan.Term) {
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return &scan.Term{
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Tk: *tk,
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Children: make([]*scan.Term, 0, 1),
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Position: scan.PosPrefix,
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Priority: scan.PriSign,
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EvalFunc: evalBuiltin,
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}
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}
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func evalBuiltin(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
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var childValue any
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if childValue, err = opTerm.EvalPrefix(ctx); err != nil {
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return
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}
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count := 0
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if kern.IsString(childValue) {
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module, _ := childValue.(string)
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count, err = ImportInContextByGlobPattern(ctx, module)
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} else {
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var moduleSpec any
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var it kern.Iterator
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if it, err = NewIterator(ctx, childValue, nil); err != nil {
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return
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}
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for moduleSpec, err = it.Next(); err == nil; moduleSpec, err = it.Next() {
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if module, ok := moduleSpec.(string); ok {
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if ImportInContext(ctx, module) {
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count++
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} else {
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err = opTerm.Errorf("unknown builtin module %q", module)
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break
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}
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} else {
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err = opTerm.Errorf("expected string at item nr %d, got %s", it.Index()+1, kern.TypeName(moduleSpec))
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break
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}
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}
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if err == io.EOF {
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err = nil
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}
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}
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if err == nil {
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v = int64(count)
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}
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return
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}
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// init
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func init() {
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scan.RegisterTermConstructor(scan.SymKwBuiltin, newBuiltinTerm)
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}
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