Add szmktk's solution

students/szmktk/main.go

@@ -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
+}
+