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really quick and dirty stackoverflow jobs feed parsing with Go
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package main | |
import ( | |
"encoding/xml" | |
"fmt" | |
"io" | |
"os" | |
"regexp" | |
"strings" | |
"time" | |
) | |
func isAnyOf(toCheck string, list []string) bool { | |
for _, str := range list { | |
if strings.EqualFold(str, toCheck) { | |
return true | |
} | |
} | |
return false | |
} | |
// Author type | |
type Author struct { | |
Name string `xml:"name"` | |
} | |
type item struct { | |
GUID string `xml:"guid"` | |
Link string `xml:"link"` | |
Author | |
Categories []string `xml:"category"` | |
Title string `xml:"title"` | |
Description string `xml:"description"` | |
PubDate string `xml:"pubDate"` | |
Location string `xml:"location"` | |
} | |
func (i item) String() string { | |
rBr := regexp.MustCompile("<br[ ]*/>") | |
rLi := regexp.MustCompile("<li>") | |
desc := rBr.ReplaceAllString(i.Description, "\n") | |
desc = rLi.ReplaceAllString(desc, "*") | |
desc = strings.Replace(desc, "</li>", "", -1) | |
desc = strings.Replace(desc, "<ul>", "", -1) | |
desc = strings.Replace(desc, "</ul>", "", -1) | |
return fmt.Sprintf("Title: %v\n", i.Title) + | |
fmt.Sprintf("Link: %v\n", i.Link) + | |
fmt.Sprintf("Categories: %v\n\n\n", i.Categories) + | |
fmt.Sprintf("Description: %v\n\n\n", desc) + | |
fmt.Sprint("**********************************************") | |
} | |
func parseFeed(xmlFile io.Reader, items chan<- item) { | |
decoder := xml.NewDecoder(xmlFile) | |
for { | |
// Read tokens from the XML document in a stream. | |
t, _ := decoder.Token() | |
if t == nil { | |
break | |
} | |
// Inspect the type of the token just read. | |
switch se := t.(type) { | |
case xml.StartElement: | |
if se.Name.Local == "item" { | |
var i item | |
err := decoder.DecodeElement(&i, &se) | |
if err != nil { | |
fmt.Printf("Error decoding %v", err) | |
continue | |
} | |
for _, category := range i.Categories { | |
if isAnyOf(category, []string{"go", "golang"}) { | |
items <- i | |
} | |
} | |
} | |
} | |
} | |
close(items) | |
} | |
func main() { | |
if len(os.Args) != 2 { | |
fmt.Printf("Error: expected an xmlFileName as argument but received %v\n", os.Args) | |
os.Exit(1) | |
} | |
xmlFileName := os.Args[1] | |
xmlFile, err := os.Open(xmlFileName) | |
if err != nil { | |
fmt.Printf("Error: couldn't open file %v, %v\n", xmlFileName, err) | |
os.Exit(1) | |
} | |
items := make(chan item, 10) | |
go parseFeed(xmlFile, items) | |
for i := range items { | |
fmt.Printf("%v\n", i) | |
time.Sleep(time.Millisecond * 40) | |
} | |
} |
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