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package goose
import (
"bytes"
"regexp"
"strconv"
"strings"
"github.com/PuerkitoBio/goquery"
"golang.org/x/net/html"
)
var normalizeWhitespaceRegexp = regexp.MustCompile(`[ \r\f\v\t]+`)
var normalizeNl = regexp.MustCompile(`[\n]+`)
var validURLRegex = regexp.MustCompile("^http[s]?://")
type outputFormatter struct {
topNode *goquery.Selection
config Configuration
language string
}
func (formatter *outputFormatter) getLanguage(lang string) string {
if formatter.config.useMetaLanguage && "" != lang {
return lang
}
return formatter.config.targetLanguage
}
func (formatter *outputFormatter) getTopNode() *goquery.Selection {
return formatter.topNode
}
func (formatter *outputFormatter) getFormattedText(topNode *goquery.Selection, lang string) (output string, links []string) {
formatter.topNode = topNode
formatter.language = formatter.getLanguage(lang)
if formatter.language == "" {
formatter.language = formatter.config.targetLanguage
}
formatter.removeNegativescoresNodes()
links = formatter.linksToText()
formatter.replaceTagsWithText()
formatter.removeParagraphsWithFewWords()
output = formatter.getOutputText()
return output, links
}
func (formatter *outputFormatter) convertToText() string {
var txts []string
selections := formatter.topNode
selections.Each(func(i int, s *goquery.Selection) {
txt := s.Text()
if txt != "" {
// txt = txt //unescape
txtLis := strings.Trim(txt, "\n")
txts = append(txts, txtLis)
}
})
return strings.Join(txts, "\n\n")
}
// check if this is a valid URL
func isValidURL(u string) bool {
return validURLRegex.MatchString(u)
}
func (formatter *outputFormatter) linksToText() []string {
var urlList []string
links := formatter.topNode.Find("a")
links.Each(func(i int, a *goquery.Selection) {
imgs := a.Find("img")
// ignore linked images
if imgs.Length() == 0 {
// save a list of URLs
url, _ := a.Attr("href")
if isValidURL(url) {
urlList = append(urlList, url)
}
// replace <a> tag with its text contents
replaceTagWithContents(a, whitelistedExtAtomTypes)
// see whether we can collapse the parent node now
replaceTagWithContents(a.Parent(), whitelistedTextAtomTypes)
}
})
return urlList
}
// Text gets the combined text contents of each element in the set of matched
// elements, including their descendants.
//
// @see https://github.com/PuerkitoBio/goquery/blob/master/property.go
func (formatter *outputFormatter) Text(s *goquery.Selection) string {
var buf bytes.Buffer
// Slightly optimized vs calling Each: no single selection object created
var f func(*html.Node)
f = func(n *html.Node) {
if n.Type == html.TextNode && 0 == n.DataAtom { // NB: had to add the DataAtom check to avoid printing text twice when a textual node embeds another textual node
// Keep newlines and spaces, like jQuery
buf.WriteString(n.Data)
}
if n.FirstChild != nil {
for c := n.FirstChild; c != nil; c = c.NextSibling {
f(c)
}
}
}
for _, n := range s.Nodes {
f(n)
}
return buf.String()
}
func (formatter *outputFormatter) getOutputText() string {
//out := formatter.topNode.Text()
out := formatter.Text(formatter.topNode)
out = normalizeWhitespaceRegexp.ReplaceAllString(out, " ")
strArr := strings.Split(out, "\n")
resArr := []string{}
for i, v := range strArr {
v = strings.TrimSpace(v)
if v != "" {
resArr = append(resArr, v)
} else if i > 2 && strArr[i-2] != "" {
resArr = append(resArr, "")
}
}
out = strings.Join(resArr, "\n")
out = normalizeNl.ReplaceAllString(out, "\n\n")
out = strings.TrimSpace(out)
return out
}
func (formatter *outputFormatter) removeNegativescoresNodes() {
gravityItems := formatter.topNode.Find("*[gravityScore]")
gravityItems.Each(func(i int, s *goquery.Selection) {
var score int
sscore, exists := s.Attr("gravityScore")
if exists {
score, _ = strconv.Atoi(sscore)
if score < 1 {
sNode := s.Get(0)
sNode.Parent.RemoveChild(sNode)
}
}
})
}
func (formatter *outputFormatter) replaceTagsWithText() {
for _, tag := range []string{"em", "strong", "b", "i", "span", "h1", "h2", "h3", "h4"} {
nodes := formatter.topNode.Find(tag)
nodes.Each(func(i int, node *goquery.Selection) {
replaceTagWithContents(node, whitelistedTextAtomTypes)
})
}
}
func (formatter *outputFormatter) removeParagraphsWithFewWords() {
language := formatter.language
if language == "" {
language = "en"
}
allNodes := formatter.topNode.Children()
allNodes.Each(func(i int, s *goquery.Selection) {
sw := formatter.config.stopWords.stopWordsCount(language, s.Text())
if sw.wordCount < 5 && s.Find("object").Length() == 0 && s.Find("em").Length() == 0 {
node := s.Get(0)
node.Parent.RemoveChild(node)
}
})
}
|
