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107 changes: 107 additions & 0 deletions students/szmktk/main.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,107 @@
package main

import (
"bytes"
"flag"
"fmt"
"io"
"log"
"os"
"strings"

"golang.org/x/net/html"
)

type Link struct {
Href string
Text string
}

func (l Link) String() string {
return fmt.Sprintf("{href='%s', text='%s'}", l.Href, l.Text)
}

func main() {
inputFile := readFile(*parseUserInput())
defer inputFile.Close()
links := parseLinks(*inputFile)
log.Println(links)
}

func parseUserInput() *string {
htmlFilePath := flag.String("file", "", "Path to the HTML file")
flag.Parse()

if *htmlFilePath == "" {
flag.Usage()
log.Fatalln("Error: HTML file path is required.")
}

return htmlFilePath
}

func readFile(path string) *os.File {
file, err := os.Open(path)
if err != nil {
log.Fatalf("Error reading HTML file: '%s': %v", path, err)
}

return file
}

func parseLinks(file os.File) []Link {
tokenizer := html.NewTokenizer(&file)
var links []Link
var buffer bytes.Buffer
var catchText bool
var link Link

for {
tokenType := tokenizer.Next()
err := processErrorToken(tokenizer, tokenType)
if err != nil {
break
}

switch tokenType {
case html.StartTagToken:
token := tokenizer.Token()
if token.DataAtom.String() == "a" && len(token.Attr) > 0 {
for _, attr := range token.Attr {
if attr.Key == "href" {
link.Href = attr.Val
catchText = true
}
}
}

case html.TextToken:
if catchText {
buffer.Write(tokenizer.Raw())
}

case html.EndTagToken:
token := tokenizer.Token()
if token.DataAtom.String() == "a" {
link.Text = strings.TrimSpace(buffer.String())
links = append(links, link)
buffer.Reset()
catchText = false
}
}
}

return links
}

func processErrorToken(tokenizer *html.Tokenizer, tokenType html.TokenType) error {
if tokenType == html.ErrorToken {
err := tokenizer.Err()
if err != io.EOF {
log.Fatalln("Error when parsing HTML", err)
}
return err
}
return nil
}