Pin new dependency: github.com/google/cel-go v0.9.0

vendor/github.com/google/cel-go/parser/options.go

@@ -0,0 +1,104 @@
+// Copyright 2021 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 parser
+
+import "fmt"
+
+type options struct {
+	maxRecursionDepth                int
+	errorRecoveryTokenLookaheadLimit int
+	errorRecoveryLimit               int
+	expressionSizeCodePointLimit     int
+	macros                           map[string]Macro
+	populateMacroCalls               bool
+}
+
+// Option configures the behavior of the parser.
+type Option func(*options) error
+
+// MaxRecursionDepth limits the maximum depth the parser will attempt to parse the expression before giving up.
+func MaxRecursionDepth(limit int) Option {
+	return func(opts *options) error {
+		if limit < -1 {
+			return fmt.Errorf("max recursion depth must be greater than or equal to -1: %d", limit)
+		}
+		opts.maxRecursionDepth = limit
+		return nil
+	}
+}
+
+// ErrorRecoveryLookaheadTokenLimit limits the number of lexer tokens that may be considered during error recovery.
+//
+// Error recovery often involves looking ahead in the input to determine if there's a point at which parsing may
+// successfully resume. In some pathological cases, the parser can look through quite a large set of input which
+// in turn generates a lot of back-tracking and performance degredation.
+//
+// The limit must be > 1, and is recommended to be less than the default of 256.
+func ErrorRecoveryLookaheadTokenLimit(limit int) Option {
+	return func(opts *options) error {
+		if limit < 1 {
+			return fmt.Errorf("error recovery lookahead token limit must be at least 1: %d", limit)
+		}
+		opts.errorRecoveryTokenLookaheadLimit = limit
+		return nil
+	}
+}
+
+// ErrorRecoveryLimit limits the number of attempts the parser will perform to recover from an error.
+func ErrorRecoveryLimit(limit int) Option {
+	return func(opts *options) error {
+		if limit < -1 {
+			return fmt.Errorf("error recovery limit must be greater than or equal to -1: %d", limit)
+		}
+		opts.errorRecoveryLimit = limit
+		return nil
+	}
+}
+
+// ExpressionSizeCodePointLimit is an option which limits the maximum code point count of an
+// expression.
+func ExpressionSizeCodePointLimit(expressionSizeCodePointLimit int) Option {
+	return func(opts *options) error {
+		if expressionSizeCodePointLimit < -1 {
+			return fmt.Errorf("expression size code point limit must be greater than or equal to -1: %d", expressionSizeCodePointLimit)
+		}
+		opts.expressionSizeCodePointLimit = expressionSizeCodePointLimit
+		return nil
+	}
+}
+
+// Macros adds the given macros to the parser.
+func Macros(macros ...Macro) Option {
+	return func(opts *options) error {
+		for _, m := range macros {
+			if m != nil {
+				if opts.macros == nil {
+					opts.macros = make(map[string]Macro)
+				}
+				opts.macros[m.MacroKey()] = m
+			}
+		}
+		return nil
+	}
+}
+
+// PopulateMacroCalls ensures that the original call signatures replaced by expanded macros
+// are preserved in the `SourceInfo` of parse result.
+func PopulateMacroCalls(populateMacroCalls bool) Option {
+	return func(opts *options) error {
+		opts.populateMacroCalls = populateMacroCalls
+		return nil
+	}
+}