42 lines
1.0 KiB
Go
42 lines
1.0 KiB
Go
package goparsify
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
)
|
|
|
|
// TrashResult is used in places where the result isnt wanted, but something needs to be passed in to satisfy the interface.
|
|
var TrashResult = &Result{}
|
|
|
|
// Result is the output of a parser. Usually only one of its fields will be set and should be though of
|
|
// more as a union type. having it avoids interface{} littered all through the parsing code and makes
|
|
// the it easy to do the two most common operations, getting a token and finding a child.
|
|
type Result struct {
|
|
Token string
|
|
Child []Result
|
|
Result interface{}
|
|
Input string
|
|
Start int
|
|
End int
|
|
}
|
|
|
|
// String stringifies a node. This is only called from debug code.
|
|
func (r Result) String() string {
|
|
if r.Result != nil {
|
|
if rs, ok := r.Result.(fmt.Stringer); ok {
|
|
return rs.String()
|
|
}
|
|
return fmt.Sprintf("%#v", r.Result)
|
|
}
|
|
|
|
if len(r.Child) > 0 {
|
|
children := []string{}
|
|
for _, child := range r.Child {
|
|
children = append(children, child.String())
|
|
}
|
|
return "[" + strings.Join(children, ",") + "]"
|
|
}
|
|
|
|
return r.Token
|
|
}
|