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ceph-csi/vendor/github.com/google/cel-go/common/debug/debug.go
Madhu Rajanna ff3e84ad67 rebase: update kubernetes to 1.28.0 in main
updating kubernetes to 1.28.0
in the main repo.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
2023-08-17 13:43:15 +00:00

312 lines
6.9 KiB
Go

// 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 debug provides tools to print a parsed expression graph and
// adorn each expression element with additional metadata.
package debug
import (
"bytes"
"fmt"
"strconv"
"strings"
exprpb "google.golang.org/genproto/googleapis/api/expr/v1alpha1"
)
// Adorner returns debug metadata that will be tacked on to the string
// representation of an expression.
type Adorner interface {
// GetMetadata for the input context.
GetMetadata(ctx any) string
}
// Writer manages writing expressions to an internal string.
type Writer interface {
fmt.Stringer
// Buffer pushes an expression into an internal queue of expressions to
// write to a string.
Buffer(e *exprpb.Expr)
}
type emptyDebugAdorner struct {
}
var emptyAdorner Adorner = &emptyDebugAdorner{}
func (a *emptyDebugAdorner) GetMetadata(e any) string {
return ""
}
// ToDebugString gives the unadorned string representation of the Expr.
func ToDebugString(e *exprpb.Expr) string {
return ToAdornedDebugString(e, emptyAdorner)
}
// ToAdornedDebugString gives the adorned string representation of the Expr.
func ToAdornedDebugString(e *exprpb.Expr, adorner Adorner) string {
w := newDebugWriter(adorner)
w.Buffer(e)
return w.String()
}
// debugWriter is used to print out pretty-printed debug strings.
type debugWriter struct {
adorner Adorner
buffer bytes.Buffer
indent int
lineStart bool
}
func newDebugWriter(a Adorner) *debugWriter {
return &debugWriter{
adorner: a,
indent: 0,
lineStart: true,
}
}
func (w *debugWriter) Buffer(e *exprpb.Expr) {
if e == nil {
return
}
switch e.ExprKind.(type) {
case *exprpb.Expr_ConstExpr:
w.append(formatLiteral(e.GetConstExpr()))
case *exprpb.Expr_IdentExpr:
w.append(e.GetIdentExpr().Name)
case *exprpb.Expr_SelectExpr:
w.appendSelect(e.GetSelectExpr())
case *exprpb.Expr_CallExpr:
w.appendCall(e.GetCallExpr())
case *exprpb.Expr_ListExpr:
w.appendList(e.GetListExpr())
case *exprpb.Expr_StructExpr:
w.appendStruct(e.GetStructExpr())
case *exprpb.Expr_ComprehensionExpr:
w.appendComprehension(e.GetComprehensionExpr())
}
w.adorn(e)
}
func (w *debugWriter) appendSelect(sel *exprpb.Expr_Select) {
w.Buffer(sel.GetOperand())
w.append(".")
w.append(sel.GetField())
if sel.TestOnly {
w.append("~test-only~")
}
}
func (w *debugWriter) appendCall(call *exprpb.Expr_Call) {
if call.Target != nil {
w.Buffer(call.GetTarget())
w.append(".")
}
w.append(call.GetFunction())
w.append("(")
if len(call.GetArgs()) > 0 {
w.addIndent()
w.appendLine()
for i, arg := range call.GetArgs() {
if i > 0 {
w.append(",")
w.appendLine()
}
w.Buffer(arg)
}
w.removeIndent()
w.appendLine()
}
w.append(")")
}
func (w *debugWriter) appendList(list *exprpb.Expr_CreateList) {
w.append("[")
if len(list.GetElements()) > 0 {
w.appendLine()
w.addIndent()
for i, elem := range list.GetElements() {
if i > 0 {
w.append(",")
w.appendLine()
}
w.Buffer(elem)
}
w.removeIndent()
w.appendLine()
}
w.append("]")
}
func (w *debugWriter) appendStruct(obj *exprpb.Expr_CreateStruct) {
if obj.MessageName != "" {
w.appendObject(obj)
} else {
w.appendMap(obj)
}
}
func (w *debugWriter) appendObject(obj *exprpb.Expr_CreateStruct) {
w.append(obj.GetMessageName())
w.append("{")
if len(obj.GetEntries()) > 0 {
w.appendLine()
w.addIndent()
for i, entry := range obj.GetEntries() {
if i > 0 {
w.append(",")
w.appendLine()
}
if entry.GetOptionalEntry() {
w.append("?")
}
w.append(entry.GetFieldKey())
w.append(":")
w.Buffer(entry.GetValue())
w.adorn(entry)
}
w.removeIndent()
w.appendLine()
}
w.append("}")
}
func (w *debugWriter) appendMap(obj *exprpb.Expr_CreateStruct) {
w.append("{")
if len(obj.GetEntries()) > 0 {
w.appendLine()
w.addIndent()
for i, entry := range obj.GetEntries() {
if i > 0 {
w.append(",")
w.appendLine()
}
if entry.GetOptionalEntry() {
w.append("?")
}
w.Buffer(entry.GetMapKey())
w.append(":")
w.Buffer(entry.GetValue())
w.adorn(entry)
}
w.removeIndent()
w.appendLine()
}
w.append("}")
}
func (w *debugWriter) appendComprehension(comprehension *exprpb.Expr_Comprehension) {
w.append("__comprehension__(")
w.addIndent()
w.appendLine()
w.append("// Variable")
w.appendLine()
w.append(comprehension.GetIterVar())
w.append(",")
w.appendLine()
w.append("// Target")
w.appendLine()
w.Buffer(comprehension.GetIterRange())
w.append(",")
w.appendLine()
w.append("// Accumulator")
w.appendLine()
w.append(comprehension.GetAccuVar())
w.append(",")
w.appendLine()
w.append("// Init")
w.appendLine()
w.Buffer(comprehension.GetAccuInit())
w.append(",")
w.appendLine()
w.append("// LoopCondition")
w.appendLine()
w.Buffer(comprehension.GetLoopCondition())
w.append(",")
w.appendLine()
w.append("// LoopStep")
w.appendLine()
w.Buffer(comprehension.GetLoopStep())
w.append(",")
w.appendLine()
w.append("// Result")
w.appendLine()
w.Buffer(comprehension.GetResult())
w.append(")")
w.removeIndent()
}
func formatLiteral(c *exprpb.Constant) string {
switch c.GetConstantKind().(type) {
case *exprpb.Constant_BoolValue:
return fmt.Sprintf("%t", c.GetBoolValue())
case *exprpb.Constant_BytesValue:
return fmt.Sprintf("b\"%s\"", string(c.GetBytesValue()))
case *exprpb.Constant_DoubleValue:
return fmt.Sprintf("%v", c.GetDoubleValue())
case *exprpb.Constant_Int64Value:
return fmt.Sprintf("%d", c.GetInt64Value())
case *exprpb.Constant_StringValue:
return strconv.Quote(c.GetStringValue())
case *exprpb.Constant_Uint64Value:
return fmt.Sprintf("%du", c.GetUint64Value())
case *exprpb.Constant_NullValue:
return "null"
default:
panic("Unknown constant type")
}
}
func (w *debugWriter) append(s string) {
w.doIndent()
w.buffer.WriteString(s)
}
func (w *debugWriter) appendFormat(f string, args ...any) {
w.append(fmt.Sprintf(f, args...))
}
func (w *debugWriter) doIndent() {
if w.lineStart {
w.lineStart = false
w.buffer.WriteString(strings.Repeat(" ", w.indent))
}
}
func (w *debugWriter) adorn(e any) {
w.append(w.adorner.GetMetadata(e))
}
func (w *debugWriter) appendLine() {
w.buffer.WriteString("\n")
w.lineStart = true
}
func (w *debugWriter) addIndent() {
w.indent++
}
func (w *debugWriter) removeIndent() {
w.indent--
if w.indent < 0 {
panic("negative indent")
}
}
func (w *debugWriter) String() string {
return w.buffer.String()
}