37 lines
823 B
Go
37 lines
823 B
Go
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package goparsify
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import (
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"fmt"
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"strings"
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)
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var TrashResult = &Result{}
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// Result is the output of a parser. Usually only one of its fields will be set and should be though of
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// more as a union type. having it avoids interface{} littered all through the parsing code and makes
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// the it easy to do the two most common operations, getting a token and finding a child.
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type Result struct {
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Token string
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Child []Result
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Result interface{}
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}
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func (r Result) String() string {
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if r.Result != nil {
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if rs, ok := r.Result.(fmt.Stringer); ok {
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return rs.String()
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}
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return fmt.Sprintf("%#v", r.Result)
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}
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if len(r.Child) > 0 {
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children := []string{}
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for _, child := range r.Child {
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children = append(children, child.String())
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}
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return "[" + strings.Join(children, ",") + "]"
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}
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return r.Token
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}
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