1 files changed, 74 insertions, 0 deletions
diff --git a/vendor/github.com/authzed/cel-go/common/error.go b/vendor/github.com/authzed/cel-go/common/error.go
new file mode 100644
index 0000000..0cf2134
--- /dev/null
+++ b/vendor/github.com/authzed/cel-go/common/error.go
@@ -0,0 +1,74 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package common
+
+import (
+	"fmt"
+	"strings"
+	"unicode/utf8"
+)
+
+// NewError creates an error associated with an expression id with the given message at the given location.
+func NewError(id int64, message string, location Location) *Error {
+	return &Error{Message: message, Location: location, ExprID: id}
+}
+
+// Error type which references an expression id, a location within source, and a message.
+type Error struct {
+	Location Location
+	Message  string
+	ExprID   int64
+}
+
+const (
+	dot     = "."
+	ind     = "^"
+	wideDot = "\uff0e"
+	wideInd = "\uff3e"
+
+	// maxSnippetLength is the largest number of characters which can be rendered in an error message snippet.
+	maxSnippetLength = 16384
+)
+
+// ToDisplayString decorates the error message with the source location.
+func (e *Error) ToDisplayString(source Source) string {
+	var result = fmt.Sprintf("ERROR: %s:%d:%d: %s",
+		source.Description(),
+		e.Location.Line(),
+		e.Location.Column()+1, // add one to the 0-based column for display
+		e.Message)
+	if snippet, found := source.Snippet(e.Location.Line()); found && len(snippet) <= maxSnippetLength {
+		snippet := strings.Replace(snippet, "\t", " ", -1)
+		srcLine := "\n | " + snippet
+		var bytes = []byte(snippet)
+		var indLine = "\n | "
+		for i := 0; i < e.Location.Column() && len(bytes) > 0; i++ {
+			_, sz := utf8.DecodeRune(bytes)
+			bytes = bytes[sz:]
+			if sz > 1 {
+				indLine += wideDot
+			} else {
+				indLine += dot
+			}
+		}
+		if _, sz := utf8.DecodeRune(bytes); sz > 1 {
+			indLine += wideInd
+		} else {
+			indLine += ind
+		}
+		result += srcLine + indLine
+	}
+	return result
+}