61 lines
1.2 KiB
Go
61 lines
1.2 KiB
Go
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package jsonpointer
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import (
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"strconv"
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"github.com/pkg/errors"
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)
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func get(doc interface{}, tokens []string) (interface{}, error) {
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if len(tokens) == 0 {
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return doc, nil
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}
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currentToken := tokens[0]
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if doc == nil {
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return nil, errors.Wrapf(ErrNotFound, "pointer '%s' not found on document", tokensToString(tokens))
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}
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switch typedDoc := doc.(type) {
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case map[string]interface{}:
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value, exists := typedDoc[currentToken]
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if !exists {
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return nil, errors.Wrapf(ErrNotFound, "pointer '%s' not found on document", tokensToString(tokens))
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}
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value, err := get(value, tokens[1:])
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if err != nil {
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return nil, errors.WithStack(err)
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}
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return value, nil
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case []interface{}:
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if currentToken == NonExistentMemberToken {
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return nil, errors.WithStack(ErrOutOfBounds)
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}
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index, err := strconv.ParseUint(currentToken, 10, 64)
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if err != nil {
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return nil, errors.WithStack(err)
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}
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if len(typedDoc) <= int(index) {
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return nil, errors.WithStack(ErrOutOfBounds)
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}
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value := typedDoc[index]
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value, err = get(value, tokens[1:])
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if err != nil {
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return nil, errors.WithStack(err)
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}
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return value, nil
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default:
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return nil, errors.Wrapf(ErrUnexpectedType, "unexpected type '%T'", typedDoc)
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}
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}
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