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lib: add evaluation state dump utility type
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| // Licensed to Elasticsearch B.V. under one or more contributor | ||
| // license agreements. See the NOTICE file distributed with | ||
| // this work for additional information regarding copyright | ||
| // ownership. Elasticsearch B.V. licenses this file to you 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. | ||
|
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| package lib | ||
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| import ( | ||
| "bytes" | ||
| "encoding/json" | ||
| "fmt" | ||
| "sort" | ||
| "strings" | ||
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| "github.com/google/cel-go/cel" | ||
| "github.com/google/cel-go/common" | ||
| ) | ||
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| // NewDump returns an evaluation dump. That can be used to examine the complete | ||
| // set of evaluation states from a CEL program. The program must have been | ||
| // constructed with a cel.Env.Program call including the cel.OptTrackState | ||
| // evaluation option. The ast and details parameters must be valid for the | ||
| // program. | ||
| func NewDump(ast *cel.Ast, details *cel.EvalDetails) *Dump { | ||
| if ast == nil || details == nil { | ||
| return nil | ||
| } | ||
| return &Dump{ast: ast, det: details} | ||
| } | ||
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| // Dump is an evaluation dump. | ||
| type Dump struct { | ||
| ast *cel.Ast | ||
| det *cel.EvalDetails | ||
| } | ||
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| func (d *Dump) String() string { | ||
| var buf strings.Builder | ||
| for i, v := range d.NodeValues() { | ||
| if i != 0 { | ||
| buf.WriteByte('\n') | ||
| } | ||
| fmt.Fprint(&buf, v) | ||
| } | ||
| return buf.String() | ||
| } | ||
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| // NodeValues returns the evaluation results, source location and source | ||
| // snippets for the expressions in the dump. The nodes are sorted in | ||
| // source order. | ||
| func (d *Dump) NodeValues() []NodeValue { | ||
| es := d.det.State() | ||
| var values []NodeValue | ||
| for _, id := range es.IDs() { | ||
| if id == 0 { | ||
| continue | ||
| } | ||
| v, ok := es.Value(id) | ||
| if !ok { | ||
| continue | ||
| } | ||
| values = append(values, d.nodeValue(v, id)) | ||
| } | ||
| sort.Slice(values, func(i, j int) bool { | ||
| vi := values[i].loc | ||
| vj := values[j].loc | ||
| switch { | ||
| case vi.Line() < vj.Line(): | ||
| return true | ||
| case vi.Line() > vj.Line(): | ||
| return false | ||
| default: | ||
| return vi.Column() < vj.Column() | ||
| } | ||
| }) | ||
| return values | ||
| } | ||
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| func (d *Dump) nodeValue(val any, id int64) NodeValue { | ||
| v := NodeValue{ | ||
| loc: d.ast.NativeRep().SourceInfo().GetStartLocation(id), | ||
| src: d.ast.Source(), | ||
| val: val, | ||
| } | ||
| return v | ||
| } | ||
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| type NodeValue struct { | ||
| loc common.Location | ||
| src common.Source | ||
| val any | ||
| } | ||
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| func (v NodeValue) MarshalJSON() ([]byte, error) { | ||
| type val struct { | ||
| Location string `json:"loc"` | ||
| Src string `json:"src"` | ||
| Val any `json:"val"` | ||
| } | ||
| var buf bytes.Buffer | ||
| enc := json.NewEncoder(&buf) | ||
| enc.SetEscapeHTML(false) | ||
| err := enc.Encode(val{ | ||
| Location: v.Loc(), | ||
| Src: v.Src(), | ||
| Val: v.val, | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return buf.Bytes(), nil | ||
| } | ||
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| func (v NodeValue) String() string { | ||
| return fmt.Sprintf("%s\n%s\n%v\n", v.Loc(), v.Src(), v.Val()) | ||
| } | ||
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| func (v NodeValue) Val() any { | ||
| return v.val | ||
| } | ||
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| func (v NodeValue) Loc() string { | ||
| return fmt.Sprintf("%s:%d:%d", v.src.Description(), v.loc.Line(), v.loc.Column()+1) | ||
| } | ||
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| func (v NodeValue) Src() string { | ||
| snippet, ok := v.src.Snippet(v.loc.Line()) | ||
| if !ok { | ||
| return "" | ||
| } | ||
| src := " | " + strings.Replace(snippet, "\t", " ", -1) | ||
| ind := "\n | " + strings.Repeat(".", minInt(v.loc.Column(), len(snippet))) + "^" | ||
| return src + ind | ||
| } | ||
|
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| func minInt(a, b int) int { | ||
| if a < b { | ||
| return a | ||
| } | ||
| return b | ||
| } |
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