chore: upgrade coredns version (#550)

vendor/github.com/expr-lang/expr/file/error.go

@@ -0,0 +1,81 @@
+package file
+
+import (
+	"fmt"
+	"strings"
+	"unicode/utf8"
+)
+
+type Error struct {
+	Location
+	Line    int    `json:"line"`
+	Column  int    `json:"column"`
+	Message string `json:"message"`
+	Snippet string `json:"snippet"`
+	Prev    error  `json:"prev"`
+}
+
+func (e *Error) Error() string {
+	return e.format()
+}
+
+func (e *Error) Bind(source Source) *Error {
+	e.Line = 1
+	for i, r := range source {
+		if i == e.From {
+			break
+		}
+		if r == '\n' {
+			e.Line++
+			e.Column = 0
+		} else {
+			e.Column++
+		}
+	}
+	if snippet, found := source.Snippet(e.Line); found {
+		snippet := strings.Replace(snippet, "\t", " ", -1)
+		srcLine := "\n | " + snippet
+		var bytes = []byte(snippet)
+		var indLine = "\n | "
+		for i := 0; i < e.Column && len(bytes) > 0; i++ {
+			_, sz := utf8.DecodeRune(bytes)
+			bytes = bytes[sz:]
+			if sz > 1 {
+				goto noind
+			} else {
+				indLine += "."
+			}
+		}
+		if _, sz := utf8.DecodeRune(bytes); sz > 1 {
+			goto noind
+		} else {
+			indLine += "^"
+		}
+		srcLine += indLine
+
+	noind:
+		e.Snippet = srcLine
+	}
+	return e
+}
+
+func (e *Error) Unwrap() error {
+	return e.Prev
+}
+
+func (e *Error) Wrap(err error) {
+	e.Prev = err
+}
+
+func (e *Error) format() string {
+	if e.Snippet == "" {
+		return e.Message
+	}
+	return fmt.Sprintf(
+		"%s (%d:%d)%s",
+		e.Message,
+		e.Line,
+		e.Column+1, // add one to the 0-based column for display
+		e.Snippet,
+	)
+}