58 lines
1.2 KiB
Go
58 lines
1.2 KiB
Go
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// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
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// All rights reserved.
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// operator-length.go
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package expr
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//-------- builtin term
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func newBuiltinTerm(tk *Token) (inst *term) {
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return &term{
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tk: *tk,
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children: make([]*term, 0, 1),
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position: posPrefix,
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priority: priSign,
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evalFunc: evalBuiltin,
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}
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}
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func evalBuiltin(ctx ExprContext, self *term) (v any, err error) {
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var rightValue any
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if rightValue, err = self.evalPrefix(ctx); err != nil {
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return
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}
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count := 0
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if isList(rightValue) {
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list, _ := rightValue.([]any)
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for i, moduleSpec := range list {
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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 = self.Errorf("unknown module %q", module)
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break
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}
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} else {
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err = self.Errorf("expected string at item nr %d, got %T", i+1, moduleSpec)
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break
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}
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}
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} else if isString(rightValue) {
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module, _ := rightValue.(string)
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count, err = ImportInContextByGlobPattern(ctx, module)
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} else {
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err = self.errIncompatibleType(rightValue)
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}
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if err == nil {
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v = 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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registerTermConstructor(SymKwBuiltin, newBuiltinTerm)
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}
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