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vis.go
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vis.go
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package vis
import (
"bytes"
"fmt"
"github.com/DimitarPetrov/printracer/parser"
"html/template"
"os"
)
const reportTemplate = `
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/css/bootstrap.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/github.min.css"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/raphael/2.2.7/raphael.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script>
<script src="https://bramp.github.io/js-sequence-diagrams/js/sequence-diagram-min.js"></script>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/js/bootstrap.min.js"></script>
<style>
body {
padding-top: 2rem;
padding-bottom: 2rem;
}
</style>
</head>
<body>
<div class="container-fluid">
<div class="card text-center">
<div class="card-body">
<div id="diagram" class="justify-content-center"></div>
</div>
</div>
<br><br>
<p class="lead">Calls</p>
<table class="table">
<thead>
<tr>
<th scope="col">#</th>
<th scope="col">Arguments</th>
</tr>
</thead>
<tbody>
{{ range $i, $e := .Args }}
<tr id="arg-{{$i}}">
<th scope="row">{{ inc $i }}</th>
<td>
<pre style="max-height: 1000px; margin-bottom: 0; border: 1px solid #eee;"><code id="event-message-{{$i}}">{{ $e }}</code></pre>
</td>
</tr>
{{ end }}
</tbody>
</table>
</div>
<script>
Diagram.parse("{{ .Diagram }}").drawSVG("diagram", {theme: 'simple', 'font-size': 14});
</script>
</body>
</html>
`
var templateFuncs = &template.FuncMap{
"inc": func(i int) int {
return i + 1
},
}
//go:generate counterfeiter . Visualizer
type Visualizer interface {
Visualize(events []parser.FuncEvent, maxDepth int, startingFunc string, outputFile string) error
}
type visualizer struct {
}
func NewVisualizer() Visualizer {
return &visualizer{}
}
func (v *visualizer) Visualize(events []parser.FuncEvent, maxDepth int, startingFunc string, outputFile string) error {
tmpl, err := template.New("sequenceDiagram").
Funcs(*templateFuncs).
Parse(reportTemplate)
if err != nil {
return fmt.Errorf("error parsing template: %v", err)
}
templateData, err := v.constructTemplateData(events, maxDepth, startingFunc)
if err != nil {
return err
}
var out bytes.Buffer
err = tmpl.Execute(&out, templateData)
if err != nil {
return fmt.Errorf("error executing template: %v", err)
}
fileName := fmt.Sprintf("%s.html", outputFile)
f, err := os.Create(fileName)
if err != nil {
return fmt.Errorf("error creating file %s: %v", fileName, err)
}
_, err = f.WriteString(out.String())
if err != nil {
return fmt.Errorf("error writing diagram data to file %s: %v", fileName, err)
}
return nil
}
type stack []parser.FuncEvent
func (s *stack) Push(event parser.FuncEvent) {
*s = append(*s, event)
}
func (s *stack) Pop() parser.FuncEvent {
event := (*s)[len(*s)-1]
*s = (*s)[:len(*s)-1]
return event
}
func (s *stack) Peek() parser.FuncEvent {
return (*s)[len(*s)-1]
}
func (s *stack) Length() int {
return len(*s)
}
func (s *stack) Empty() bool {
return s.Length() == 0
}
type templateData struct {
Args []string
Diagram string
MetaJSON template.JS
}
type sequenceDiagramData struct {
data bytes.Buffer
count int
}
func (r *sequenceDiagramData) addFunctionInvocation(source string, target string) {
r.addRecord(source, "->", target)
}
func (r *sequenceDiagramData) addFunctionReturn(source string, target string) {
r.addRecord(source, "-->", target)
}
func (r *sequenceDiagramData) addRecord(source string, operation string, target string) {
r.count++
r.data.WriteString(fmt.Sprintf("%s%s%s: (%d)\n", source, operation, target, r.count))
}
func (r *sequenceDiagramData) String() string {
return r.data.String()
}
func (v *visualizer) constructTemplateData(events []parser.FuncEvent, maxDepth int, startingFunc string) (templateData, error) {
diagramData := &sequenceDiagramData{}
if len(startingFunc) > 0 {
for i := 0; i < len(events); i++ {
if events[i].FuncName() == startingFunc {
events = events[i:]
break
}
}
for i := 1; i < len(events); i++ {
if events[i].FuncName() == startingFunc {
events = events[:i+1]
break
}
}
}
stack := stack(make([]parser.FuncEvent, 0, len(events)))
var args []string
for i := 0; i < len(events); i++ {
event := events[i]
switch event := event.(type) {
case *parser.InvocationEvent:
if stack.Length() < maxDepth {
prev := event
if !stack.Empty() {
prev = stack.Peek().(*parser.InvocationEvent)
}
diagramData.addFunctionInvocation(prev.Name, event.FuncName())
args = append(args, fmt.Sprintf("calling %s", event.Args))
stack.Push(event)
}
case *parser.ReturningEvent:
if stack.Peek().FuncName() == event.FuncName() {
prev := stack.Pop()
if !stack.Empty() {
prev = stack.Peek()
}
diagramData.addFunctionReturn(event.FuncName(), prev.FuncName())
args = append(args, "returning")
}
}
}
return templateData{
Diagram: diagramData.String(),
Args: args,
}, nil
}