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|
package usage
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"regexp"
"strings"
"golang.org/x/net/html"
)
// Section keeps track of individual sections
type Section struct {
Command string `json:"command"`
Name string `json:"name"`
Text string `json:"text"`
Words int `json:"words"`
Lines int `json:"lines"`
Sections []*Section `json:"sections"`
}
// Report holds together a report of sections
type Report struct {
Report []*Section `json:"report"`
}
// NewReport returns report based on raw
func NewReport(command string, top []byte) *Report {
report := Report{}
report.Process(command, top)
return &report
}
// Write serializes the report to json
func (report *Report) Write(w io.Writer) error {
j, err := json.MarshalIndent(report, "", " ")
if err != nil {
return err
}
w.Write(j)
return nil
}
// Process adds a html based help page to the report
func (report *Report) Process(command string, raw []byte) error {
r := bytes.NewBuffer(raw)
doc, err := html.Parse(r)
if err != nil {
return err
}
if doc.FirstChild.Type != html.ElementNode ||
doc.FirstChild.Data != "html" ||
doc.FirstChild.FirstChild.NextSibling.Data != "body" {
return errors.New("error parsing raw html")
}
body := doc.FirstChild.FirstChild.NextSibling
report.addSection(command, body.FirstChild, nil)
return nil
}
func (report *Report) addSection(command string, node *html.Node, section *Section) (*html.Node, *Section) {
if node == nil ||
node.Type != html.ElementNode ||
node.Data != "h2" {
return nil, nil
}
text, next := report.processNode(node)
words := strings.Fields(text)
lines := strings.Split(text, "\n")
s := Section{
Command: command,
Name: node.FirstChild.Data,
Text: text,
Words: len(words),
Lines: len(lines),
}
if section == nil {
report.Report = append(report.Report, &s)
return report.addSection(command, next, &s)
}
section.Sections = append(section.Sections, &s)
return report.addSection(command, next, section)
}
func (report *Report) processNode(node *html.Node) (string, *html.Node) {
text := ""
current := node.NextSibling
r, _ := regexp.Compile("<[^>]*>")
for current != nil {
var buf bytes.Buffer
w := io.Writer(&buf)
html.Render(w, current)
notags := r.ReplaceAllString(buf.String(), "")
clean := strings.TrimSpace(notags)
if len(text) > 0 && len(clean) > 0 {
text = fmt.Sprintf("%s %s", text, clean)
} else if len(clean) > 0 {
text = clean
}
current = current.NextSibling
if current == nil {
return text, nil
} else if current.Type == html.ElementNode &&
current.Data == "h2" {
node = current
current = nil
}
}
return text, node
}
// PerHeadline returns all sections across commands/pages with the same headline
func (report *Report) PerHeadline(headline string) []Section {
var results []Section
for _, top := range report.Report {
for _, section := range top.Sections {
if section.Name != headline {
continue
}
results = append(results, *section)
}
}
return results
}
|
