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error.go

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package expr

import (

"fmt"

"strings"

)

type syntaxError struct {

message string

input string

pos int

}

func (e *syntaxError) Error() string {

snippet := ""

if len(e.input) > 0 {

snippet = fmt.Sprintf("\n%s\n%s", e.input, strings.Repeat("-", e.pos)+"^")

}

return e.message + snippet

}

func (e *syntaxError) at(t token) error {

e.pos = t.pos

return e

}