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Copy pathtrafilatura_test.go
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trafilatura_test.go
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// This file is part of go-trafilatura, Go package for extracting readable
// content, comments and metadata from a web page. Source available in
// <https://github.com/markusmobius/go-trafilatura>.
//
// Copyright (C) 2021 Markus Mobius
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Code in this file is ported from <https://github.com/adbar/trafilatura>
// which available under Apache 2.0 license.
package trafilatura
import (
"bytes"
"fmt"
"io"
nurl "net/url"
"os"
"path/filepath"
"strings"
"testing"
"time"
"github.com/go-shiori/dom"
"github.com/markusmobius/go-htmldate"
"github.com/markusmobius/go-trafilatura/internal/etree"
"github.com/markusmobius/go-trafilatura/internal/lru"
"github.com/stretchr/testify/assert"
"golang.org/x/net/html"
)
var (
exampleURL, _ = nurl.ParseRequestURI("https://example.org")
trafilaturaMockFiles = map[string]string{
"http://exotic_tags": "exotic_tags.html",
}
zeroOpts = Options{
EnableFallback: true,
OriginalURL: exampleURL,
Config: zeroConfig,
}
zeroConfig = &Config{
MinOutputSize: 0,
MinExtractedSize: 0,
}
defaultOpts = Options{
Config: DefaultConfig(),
}
)
func Test_Trim(t *testing.T) {
// Test string trimming
assert.Equal(t, "Test", trim(" Test "))
assert.Equal(t, "Test Test", trim("\t\tTest Test\r\n"))
elem := etree.Element("body")
etree.SetText(elem, "Test Text")
assert.False(t, textFilter(elem))
etree.SetText(elem, "Instagram")
assert.True(t, textFilter(elem))
etree.SetText(elem, "\t\t")
assert.True(t, textFilter(elem))
}
func Test_ExoticTags(t *testing.T) {
var result *ExtractResult
var htmlString string
var opts Options
// Cover some edge cases with a specially crafted file
result = extractMockFile(trafilaturaMockFiles, "http://exotic_tags")
assert.Contains(t, result.ContentText, "Teletype text")
assert.Contains(t, result.ContentText, "My new car is silver.")
// Misformed HTML declaration
htmlString = `<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 2012"http://www.w3.org/TR/html4/loose.dtd"><html><head></head><body><p>ABC</p></body></html>`
result, err := Extract(strings.NewReader(htmlString), zeroOpts)
assert.Nil(t, err)
assert.Contains(t, result.ContentText, "ABC")
// Quotes
potentialTags := duplicateMap(tagCatalog)
assert.Nil(t, handleQuotes(etree.Element("blockquote"), nil, zeroOpts))
assert.Nil(t, handleTable(etree.Element("table"), potentialTags, nil, zeroOpts))
// Nested <p> with trailing line break
element, second := etree.Element("p"), etree.Element("p")
etree.SetText(element, "1st part.")
etree.SetText(second, "2nd part.")
etree.Append(element, second)
etree.SubElement(element, "br")
converted := handleParagraphs(element, map[string]struct{}{"p": {}}, nil, zeroOpts)
assert.Equal(t, "<p>1st part. 2nd part.</p>", etree.ToString(converted))
// Naked div with <br>
opts = Options{Config: zeroConfig}
htmlString = `<html><body><main><div>1.<br/>2.<br/>3.<br/></div></main></body></html>`
result, _ = Extract(strings.NewReader(htmlString), opts)
assert.Contains(t, result.ContentText, "1. 2. 3.")
// HTML5: <details>
opts = Options{Config: zeroConfig}
htmlString = `<html><body><article><details><summary>Epcot Center</summary><p>Epcot is a theme park at Walt Disney World Resort featuring exciting attractions, international pavilions, award-winning fireworks and seasonal special events.</p></details></article></body></html>`
result, _ = Extract(strings.NewReader(htmlString), opts)
assert.Contains(t, result.ContentText, "Epcot Center")
assert.Contains(t, result.ContentText, "award-winning fireworks")
htmlString = `<html><body><article><details><summary>Epcot Center</summary><p>Epcot is a theme park at Walt Disney World Resort featuring exciting attractions, international pavilions, award-winning fireworks and seasonal special events.</p></details></article></body></html>`
result, _ = Extract(strings.NewReader(htmlString), opts)
assert.Contains(t, result.ContentText, "Epcot Center")
assert.Contains(t, result.ContentText, "award-winning fireworks")
// Edge cases
htmlString = `
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>A weird bug</title>
</head>
<body>
<div>
<h1>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</h1>
<h2>Sed et interdum lectus.</h2>
<p>Quisque molestie nunc eu arcu condimentum fringilla.</p>
<!-- strong can be changed to b, em, i, u, or kbd -->
<strong><a></a></strong>
<h2>Aliquam eget interdum elit, id posuere ipsum.</h2>
<p>Phasellus lectus erat, hendrerit sed tortor ac, dignissim vehicula metus.<br/></p>
</div>
</body>
</html>`
opts = Options{IncludeLinks: true, IncludeImages: true}
result, _ = Extract(strings.NewReader(htmlString), opts)
assert.NotEmpty(t, result.ContentText)
htmlString = `
<html>
<head>
<meta charset="UTF-8">
<title>A weird bug</title>
</head>
<body>
<div id="content">
<h1>A header</h1>
<h2>Very specific bug so odd</h2>
<h3>Nested header</h3>
<p>Some "hyphenated-word quote" followed by a bit more text line.</p>
<em>
<p>em improperly wrapping p here</p>
</em>
<p>Text here<br/></p>
<h3>More articles</h3>
</div>
</body>
</html>`
opts = Options{IncludeLinks: true, IncludeImages: true}
for _, focus := range []ExtractionFocus{Balanced, FavorRecall, FavorPrecision} {
opts.Focus = focus
result, _ = Extract(strings.NewReader(htmlString), opts)
assert.Contains(t, result.ContentText, "em improperly wrapping p here")
assert.True(t, strings.HasSuffix(result.ContentText, "Text here"))
}
}
func Test_HtmlProcessing(t *testing.T) {
var opts Options
var node *html.Node
var htmlString string
var result *ExtractResult
strToNode := func(s string) *html.Node {
n, _ := dom.FastParse(strings.NewReader(s))
return n
}
// Paywalls
opts = Options{Config: zeroConfig}
htmlString = `<html><body><main><p>1</p><p id="premium">2</p><p>3</p></main></body></html>`
result, _ = Extract(strings.NewReader(htmlString), opts)
assert.Equal(t, "1 3", result.ContentText)
// Test tail of node deleted if set as text
node = strToNode(`<div><p></p>tail</div>`)
node = processNode(dom.QuerySelector(node, "p"), nil, defaultOpts)
assert.Equal(t, "tail", etree.Text(node))
assert.Equal(t, "", etree.Tail(node))
node = strToNode(`<ol><li></li>text in tail</ol>`)
node = processNode(dom.QuerySelector(node, "li"), nil, defaultOpts)
assert.Equal(t, "text in tail", etree.Text(node))
assert.Equal(t, "", etree.Tail(node))
node = strToNode(`<p><br/>tail</p>`)
node = processNode(dom.QuerySelector(node, "br"), nil, defaultOpts)
assert.Equal(t, "", etree.Text(node))
assert.Equal(t, "tail", etree.Tail(node))
node = strToNode(`<div><p>some text</p>tail</div>`)
node = processNode(dom.QuerySelector(node, "p"), nil, defaultOpts)
assert.Equal(t, "some text", etree.Text(node))
assert.Equal(t, "tail", etree.Tail(node))
// Text node handler
node = strToNode(`<p><a href="url"><strong>bold</strong>inner</a>outer</p>`)
node = handleTextNode(dom.QuerySelector(node, "a"), nil, false, false, defaultOpts)
assert.Equal(t, "outer", etree.Tail(node))
node = strToNode(`<p><a href="url">text</a>tail</p>`)
node = handleTextNode(dom.QuerySelector(node, "a"), nil, false, false, defaultOpts)
assert.Equal(t, "text", etree.Text(node))
assert.Equal(t, "tail", etree.Tail(node))
node = strToNode(`<p><a href="url"></a>tail</p>`)
node = handleTextNode(dom.QuerySelector(node, "a"), nil, false, false, defaultOpts)
assert.Equal(t, "tail", etree.Text(node))
assert.Equal(t, "", etree.Tail(node))
node = strToNode(`<p><a href="url">text<strong>bold</strong></a>tail</p>`)
node = handleTextNode(dom.QuerySelector(node, "a"), nil, false, false, defaultOpts)
assert.Equal(t, "text", etree.Text(node))
assert.Equal(t, "tail", etree.Tail(node))
}
func Test_LanguageClassifier(t *testing.T) {
var lang string
var htmlInput string
var result *ExtractResult
// Content text only
lang = languageClassifier("Hier ist ein Text auf Deutsch", "")
assert.Equal(t, "de", lang)
lang = languageClassifier("Hier ist ein Text auf Deutsch", "")
assert.NotEqual(t, "en", lang)
// Comments text
lang = languageClassifier("Hier ist ein Text auf Deutsch", "Die Kommentare sind aber etwas länger.")
assert.Equal(t, "de", lang)
lang = languageClassifier("This is English.", "Die Kommentare sind aber etwas länger.")
assert.Equal(t, "de", lang)
// Extraction result
htmlInput = `<html><body><p>Texto en español</p></body></html>`
result, _ = Extract(strings.NewReader(htmlInput), zeroOpts)
assert.Equal(t, "es", result.Metadata.Language)
// Originally they use "Texte en français" here but it's too short which
// make whatlanggo confuse it with Afrikaans, so here I pick a longer sentence.
htmlInput = `<html><body><p>Après la pluie, le beau temps.</p></body></html>`
result, _ = Extract(strings.NewReader(htmlInput), zeroOpts)
assert.Equal(t, "fr", result.Metadata.Language)
}
func Test_Cache(t *testing.T) {
cache := lru.NewCache(2)
div1 := etree.Element("div")
p1 := etree.SubElement(div1, "p")
etree.SetText(p1, "AAAA BBBB AAAA BBBB AAAA BBBB AAAA BBBB AAAA BBBB AAAA BBBB AAAA BBBB AAAA BBBB AAAA BBBB AAAA BBBB AAAA BBBB AAAA BBBB AAAA BBBB")
assert.False(t, duplicateTest(p1, cache, defaultOpts))
assert.False(t, duplicateTest(p1, cache, defaultOpts))
assert.False(t, duplicateTest(div1, cache, defaultOpts))
assert.True(t, duplicateTest(p1, cache, defaultOpts))
div2 := etree.Element("div")
p2 := etree.SubElement(div2, "p")
etree.SetText(p2, "CCCC DDDD CCCC DDDD CCCC DDDD CCCC DDDD CCCC DDDD CCCC DDDD CCCC DDDD CCCC DDDD CCCC DDDD CCCC DDDD CCCC DDDD")
assert.False(t, duplicateTest(div2, cache, defaultOpts))
assert.False(t, duplicateTest(p2, cache, defaultOpts))
assert.False(t, duplicateTest(div2, cache, defaultOpts))
assert.True(t, duplicateTest(p2, cache, defaultOpts))
div3 := etree.Element("div")
p3 := etree.SubElement(div3, "p")
etree.SetText(p3, "EEEE FFFF EEEE FFFF EEEE FFFF EEEE FFFF EEEE FFFF EEEE FFFF EEEE FFFF EEEE FFFF EEEE FFFF EEEE FFFF EEEE FFFF EEEE FFFF EEEE FFFF")
assert.False(t, duplicateTest(div3, cache, defaultOpts))
assert.False(t, duplicateTest(div3, cache, defaultOpts))
assert.False(t, duplicateTest(div3, cache, defaultOpts))
// Since cache haven't been cleared, try the old nodes
assert.True(t, duplicateTest(p2, cache, defaultOpts))
assert.True(t, duplicateTest(p3, cache, defaultOpts))
assert.False(t, duplicateTest(p1, cache, defaultOpts))
// Clear the cache then try again
cache.Clear()
assert.False(t, duplicateTest(p2, cache, defaultOpts))
// Get wrong key
val, exist := cache.Get("tralala")
assert.Zero(t, val)
assert.False(t, exist)
}
func Test_Formatting(t *testing.T) {
var r io.Reader
var opts Options
var result *ExtractResult
fnHtml := func(r *ExtractResult) string {
return etree.ToString(r.ContentNode)
}
// Trailing line break
r = strings.NewReader("<html><body><p>This here is the text.<br/></p></body></html>")
result, _ = Extract(r, zeroOpts)
assert.NotContains(t, fnHtml(result), "<br/>")
// Simple
r = strings.NewReader("<html><body><p><b>This here is in bold font.</b></p></body></html>")
result, _ = Extract(r, zeroOpts)
assert.Contains(t, fnHtml(result), "<p><b>This here is in bold font.</b></p>")
// Title
r = strings.NewReader("<html><body><article><h3>Title</h3><p><b>This here is in bold font.</b></p></article></body></html>")
result, _ = Extract(r, zeroOpts)
assert.Contains(t, fnHtml(result), "<h3>Title</h3>")
assert.Contains(t, fnHtml(result), "<p><b>This here is in bold font.</b></p>")
// Nested
r = strings.NewReader("<html><body><p><b>This here is in bold and <i>italic</i> font.</b></p></body></html>")
result, _ = Extract(r, zeroOpts)
assert.Contains(t, fnHtml(result), "<p><b>This here is in bold and <i>italic</i> font.</b></p>")
// Empty
r = strings.NewReader("<html><body><p><b><i></i></b></p></body></html>")
result, _ = Extract(r, zeroOpts)
assert.Contains(t, fnHtml(result), "<body></body>")
// Wild div
r = strings.NewReader("<html><body><article><div><strong>Wild text</strong></div></article></body></html>")
result, _ = Extract(r, zeroOpts)
assert.Contains(t, fnHtml(result), "<p>")
assert.Contains(t, fnHtml(result), "<strong>Wild text</strong>")
assert.Equal(t, "Wild text", result.ContentText)
// Links
r = strings.NewReader(`<html><body><p><a href="">Link text</a></p></body></html>`)
result, _ = Extract(r, zeroOpts)
assert.Equal(t, "Link text", dom.TextContent(result.ContentNode))
// Line breaks
r = strings.NewReader(`<html><body><p><br/></p></body></html>`)
result, _ = Extract(r, zeroOpts)
assert.Equal(t, "", dom.TextContent(result.ContentNode))
r = strings.NewReader(`<html><body><p><br/>Here is the text.</p></body></html>`)
result, _ = Extract(r, zeroOpts)
assert.Equal(t, "Here is the text.", dom.TextContent(result.ContentNode))
// Handle formatting tails
body := etree.Element("body")
element := etree.SubElement(body, "b")
etree.SetText(element, "Here is the text.")
etree.SetTail(element, "And a tail.")
converted := handleFormatting(element, nil, zeroOpts)
assert.Equal(t, "<p><b>Here is the text.</b>And a tail.</p>", etree.ToString(converted))
// Empty elements
r = strings.NewReader("<html><body><div>\t\n</div><div>There is text here.</div></body></html>")
result, _ = Extract(r, zeroOpts)
assert.Equal(t, "<div><p>There is text here.</p></div>", fnHtml(result))
// List with links
opts = Options{IncludeLinks: true, Config: zeroConfig}
r = strings.NewReader(`<html><body><article><ul><li>Number 1</li><li>Number <a href="test.html">2</a></li><li>Number 3</li><p>Test</p></article></body></html>`)
result, _ = Extract(r, opts)
assert.Contains(t, fnHtml(result), `<li>Number <a href="test.html">2</a></li>`)
// (Markdown) formatting within <p>-tag
rawHTML := `<html><body><p><b>bold</b>, <i>italics</i>, <tt>tt</tt>, <strike>deleted</strike>, <u>underlined</u>, <a href="test.html">link</a> and additional text to bypass detection.</p></body></html>`
opts = Options{IncludeLinks: false, Config: zeroConfig}
result, _ = Extract(strings.NewReader(rawHTML), opts)
assert.Equal(t, "bold, italics, tt, deleted, underlined, link and additional text to bypass detection.", dom.TextContent(result.ContentNode))
assert.Contains(t, dom.OuterHTML(result.ContentNode), `<p><b>bold</b>, <i>italics</i>, <tt>tt</tt>, <strike>deleted</strike>, <u>underlined</u>, link and additional text to bypass detection.</p>`)
opts = Options{IncludeLinks: true, Config: zeroConfig}
result, _ = Extract(strings.NewReader(rawHTML), opts)
assert.Contains(t, dom.OuterHTML(result.ContentNode), `<p><b>bold</b>, <i>italics</i>, <tt>tt</tt>, <strike>deleted</strike>, <u>underlined</u>, <a href="test.html">link</a> and additional text to bypass detection.</p>`)
// Line break following formatting
r = strings.NewReader("<html><body><article><p><strong>Staff Review of the Financial Situation</strong><br>Domestic financial conditions remained accommodative over the intermeeting period.</p></article></body></html>")
result, _ = Extract(r, zeroOpts)
assert.Equal(t, "Staff Review of the Financial Situation\nDomestic financial conditions remained accommodative over the intermeeting period.", dom.InnerText(result.ContentNode))
// Title with formatting
r = strings.NewReader(`
<html><body>
<article>
<h4 id="1theinoperator">1) The <code>in</code> Operator</h4>
<p>The easiest way to check if a Python string contains a substring is to use the <code>in</code> operator. The <code>in</code> operator is used to check data structures for membership in Python. It returns a Boolean (either <code>True</code> or <code>False</code>) and can be used as follows:</p>
</article>
</body></html>`)
result, _ = Extract(r, zeroOpts)
assert.Contains(t, fnHtml(result), `<h4>1) The <code>in</code> Operator</h4>`)
assert.Contains(t, fnHtml(result), `<p>The easiest way to check if a Python string contains a substring is to use the <code>in</code> operator.`)
assert.Contains(t, fnHtml(result), `The <code>in</code> operator is used to check data structures for membership in Python.`)
assert.Contains(t, fnHtml(result), `It returns a Boolean (either <code>True</code> or <code>False</code>) and can be used as follows:`)
// Double <p> elems
r = strings.NewReader("<html><body><p>AAA, <p>BBB</p>, CCC.</p></body></html>")
result, _ = Extract(r, Options{IncludeLinks: true, Config: zeroConfig})
assert.Contains(t, result.ContentText, "AAA")
assert.Contains(t, result.ContentText, "BBB")
assert.Contains(t, result.ContentText, "CCC")
}
func Test_Filters(t *testing.T) {
// Helper function
rRepeatElement := func(element string, repeat int) io.Reader {
str := fmt.Sprintf("<html><body>%s</body></html>", strings.Repeat(element, repeat))
return strings.NewReader(str)
}
// Recursion limit
p1 := "<p>abc</p>"
p2 := "<p><i>abc</i></p>"
opts := Options{MaxTreeSize: 500}
result, _ := Extract(rRepeatElement(p1, 50), opts)
assert.NotNil(t, result)
result, _ = Extract(rRepeatElement(p1, 501), opts)
assert.Nil(t, result)
result, _ = Extract(rRepeatElement(p2, 501), opts)
assert.Nil(t, result)
result, _ = Extract(rRepeatElement(p2, 499), opts)
assert.NotNil(t, result)
// HTML lang filter
// No lang
opts = Options{TargetLanguage: "en"}
doc := docFromStr(`<html><body></body></html>`)
assert.True(t, checkHtmlLanguage(doc, opts, false))
// Lang detection on content
str := `html><body><article><p>How many ages hence/Shall this our lofty scene be acted over,/In states unborn and accents yet unknown!</p></article></body></html>`
opts = Options{TargetLanguage: "de"}
result, _ = Extract(strings.NewReader(str), opts)
assert.Nil(t, result)
opts = Options{TargetLanguage: "en"}
result, _ = Extract(strings.NewReader(str), opts)
assert.NotNil(t, result)
// TODO: In original Trafilatura, the value of p3 is set to "In sleep a king,
// but waking no such matter." which is part of Sonnet 87, classic English poem
// by Shakespear. Unfortunately, whatlanggo struggle to detect its language.
// However, when I added the entire closure of Sonnet 87, it works. Need to
// investigate later.
p3 := "<p>Thus have I had thee as a dream doth flatter, In sleep a king, but waking no such matter.</p>"
str = `<html lang="en-US"><body>` + strings.Repeat(p3, 50) + `</body></html>`
opts = Options{TargetLanguage: "en"}
result, _ = Extract(strings.NewReader(str), opts)
assert.NotNil(t, result)
opts = Options{TargetLanguage: "de"}
result, _ = Extract(strings.NewReader(str), opts)
assert.Nil(t, result)
str = `<html lang="de-DE"><body>` + strings.Repeat(p3, 50) + `</body></html>`
opts = Options{TargetLanguage: "de"}
result, _ = Extract(strings.NewReader(str), opts)
assert.Nil(t, result)
// http-equiv="content-language"
opts.TargetLanguage = "en"
doc = docFromStr(`<html><head><meta http-equiv="content-language" content="en"></head><body></body></html>`)
assert.True(t, checkHtmlLanguage(doc, opts, false))
opts.TargetLanguage = "de"
doc = docFromStr(`<html><head><meta http-equiv="content-language" content="en"></head><body></body></html>`)
assert.False(t, checkHtmlLanguage(doc, opts, false))
opts.TargetLanguage = "de"
doc = docFromStr(`<html><head><meta http-equiv="content-language" content="DE"></head><body></body></html>`)
assert.True(t, checkHtmlLanguage(doc, opts, false))
// HTML lang attribute superseded by og:locale
doc = docFromStr(`<html lang="en-US"><head><meta property="og:locale" content="de_DE" /></head><body></body></html>`)
opts.TargetLanguage = "de"
assert.True(t, checkHtmlLanguage(doc, opts, false))
opts.TargetLanguage = "en"
assert.False(t, checkHtmlLanguage(doc, opts, false))
// Last choice: HTML lang attribute
doc = docFromStr(`<html lang="de_DE, en_US"><body></body></html>`)
opts.TargetLanguage = "de"
assert.True(t, checkHtmlLanguage(doc, opts, false))
assert.True(t, checkHtmlLanguage(doc, opts, true))
opts.TargetLanguage = "en"
assert.True(t, checkHtmlLanguage(doc, opts, false))
assert.True(t, checkHtmlLanguage(doc, opts, true))
// If strict, lang attribute in <html> should be checked
opts.TargetLanguage = "it"
doc = docFromStr(`<html lang="en"><body></body></html>`)
assert.False(t, checkHtmlLanguage(doc, opts, true)) // is strict
assert.True(t, checkHtmlLanguage(doc, opts, false)) // not strict
// Even if in strict mode, lang in <html> attribute is the last choice
opts.TargetLanguage = "de"
doc = docFromStr(`<html lang="en-US"><head><meta property="og:locale" content="de_DE" /></head><body></body></html>`)
assert.True(t, checkHtmlLanguage(doc, opts, true)) // is strict
assert.True(t, checkHtmlLanguage(doc, opts, false)) // not strict
}
func Test_External(t *testing.T) {
var f io.Reader
var opts Options
var doc *html.Node
var result *ExtractResult
// Remove unwanted elements
doc = docFromStr(`<html><body><footer>Test text</footer></body></html>`)
sanitizeTree(doc, defaultOpts)
assert.Empty(t, etree.IterText(doc, " "))
doc = docFromStr(`<html><body><table><th>Test text</th><tr><td>Test</td></tr></table></body></html>`)
sanitizeTree(doc, defaultOpts)
assert.NotEmpty(t, etree.IterText(doc, " "))
// Strip fancy tags while excluding links and images
doc = docFromStr(`<html><body><p>Text here <fancy>Test text</fancy><a href="">with a link</a>.</p><img src="test.jpg"/></body></html>`)
sanitizeTree(doc, defaultOpts)
mainTree := dom.QuerySelector(doc, "body")
assert.Len(t, dom.Children(mainTree), 1)
// Strip fancy tags while including links and images
opts = Options{IncludeLinks: true, IncludeImages: true}
doc = docFromStr(`<html><body><p>Text here <fancy>Test text</fancy><a href="">with a link</a>.</p><img src="test.jpg"/></body></html>`)
sanitizeTree(doc, opts)
mainTree = dom.QuerySelector(doc, "body")
aNodes := dom.GetElementsByTagName(mainTree, "a")
imgNodes := dom.GetElementsByTagName(mainTree, "img")
assert.Len(t, dom.Children(mainTree), 2)
assert.NotZero(t, len(aNodes))
assert.NotZero(t, len(imgNodes))
// Test language
opts = Options{TargetLanguage: "en"}
str := `<html><body>` + strings.Repeat("<p>Non è inglese.</p>", 20) + `</body></html>`
result, _ = Extract(strings.NewReader(str), opts)
assert.Nil(t, result)
// No tables
f, _ = os.Open(filepath.Join("test-files", "simple", "apache.html"))
doc, _ = html.Parse(f)
opts = Options{ExcludeTables: false}
result, _ = ExtractDocument(doc, opts)
assert.Contains(t, result.ContentText, "localhost:80")
opts = Options{ExcludeTables: true}
result, _ = ExtractDocument(doc, opts)
assert.NotContains(t, result.ContentText, "localhost:80")
// Table sub elements
f, _ = os.Open(filepath.Join("test-files", "simple", "scam.html"))
doc, _ = html.Parse(f)
opts = Options{ExcludeTables: true, Config: zeroConfig}
result, _ = ExtractDocument(doc, opts)
assert.Empty(t, result.ContentText)
opts = Options{ExcludeTables: true, EnableFallback: true, Config: zeroConfig}
result, _ = ExtractDocument(doc, opts)
assert.NotEmpty(t, result.ContentText)
assert.NotContains(t, result.ContentText, "Uncensored Hosting")
assert.NotContains(t, result.ContentText, "ChooseBetter")
}
func Test_Images(t *testing.T) {
// File type
assert.True(t, isImageFile("test.jpg"))
assert.False(t, isImageFile("test.txt"))
// Image handler
img := handleImage(etree.FromString(`<img src="test.jpg"/>`))
assert.NotNil(t, img)
img = handleImage(etree.FromString(`<img data-src="test.jpg" alt="text" title="a title"/>`))
assert.NotNil(t, img)
img = handleImage(etree.FromString(`<img other="test.jpg"/>`))
assert.Nil(t, img)
// Extension checker
assert.True(t, isImageFile("test.jpg"))
assert.False(t, isImageFile("test.txt"))
// Text element handler
assert.Nil(t, handleTextElem(etree.Element("img"), nil, nil, defaultOpts))
// From file
f, _ := os.Open(filepath.Join("test-files", "simple", "http_sample.html"))
bt, _ := io.ReadAll(f)
opts := defaultOpts
result, _ := Extract(bytes.NewReader(bt), opts)
contentHtml := dom.OuterHTML(result.ContentNode)
assert.NotContains(t, contentHtml, `<img src="test.jpg" title="Example image"/>`)
opts.IncludeImages = true
result, _ = Extract(bytes.NewReader(bt), opts)
contentHtml = dom.OuterHTML(result.ContentNode)
assert.Contains(t, contentHtml, `<img src="test.jpg" title="Example image"/>`)
// CNN example
f, _ = os.Open(filepath.Join("test-files", "simple", "cnn-image.html"))
doc, _ := html.Parse(f)
img = handleImage(dom.QuerySelector(doc, "img"))
assert.NotNil(t, img)
assert.True(t, dom.HasAttribute(img, "alt"))
assert.True(t, dom.HasAttribute(img, "src"))
// Modified CNN example
f, _ = os.Open(filepath.Join("test-files", "simple", "cnn-image-modified.html"))
doc, _ = html.Parse(f)
img = handleImage(dom.QuerySelector(doc, "img"))
assert.NotNil(t, img)
assert.True(t, dom.HasAttribute(img, "alt"))
assert.True(t, dom.HasAttribute(img, "src"))
assert.True(t, strings.HasPrefix(dom.GetAttribute(img, "src"), "http"))
}
func Test_Links(t *testing.T) {
// Prepare options
linkOpts := Options{
IncludeLinks: true,
Config: zeroConfig,
}
// Test handleTextElem
processed := handleTextElem(etree.Element("a"), nil, nil, defaultOpts)
assert.Nil(t, processed)
// Formatting link
element := etree.FromString(`<a href="testlink.html">Test link text.</a>`)
processed = handleFormatting(element, nil, zeroOpts)
assert.NotNil(t, processed)
// Extracting links with target
htmlStr := `<html><body><p><a href="testlink.html">Test link text.</a>This part of the text has to be long enough.</p></body></html>`
result, _ := Extract(strings.NewReader(htmlStr), zeroOpts)
assert.NotContains(t, dom.OuterHTML(result.ContentNode), "testlink.html")
result, _ = Extract(strings.NewReader(htmlStr), linkOpts)
assert.Contains(t, dom.OuterHTML(result.ContentNode), `<a href="testlink.html">Test link text.</a>This part of the text has to be long enough.`)
// Relative link conversion
originalURL, _ := nurl.ParseRequestURI("https://www.example.com")
result, _ = Extract(strings.NewReader(htmlStr), Options{
IncludeLinks: true,
Config: zeroConfig,
OriginalURL: originalURL})
assert.Contains(t, dom.OuterHTML(result.ContentNode), `<a href="https://www.example.com/testlink.html">Test link text.</a>This part of the text has to be long enough.`)
// Extracting links without target
htmlStr = `<html><body><p><a>Test link text.</a>This part of the text has to be long enough.</p></body></html>`
result, _ = Extract(strings.NewReader(htmlStr), linkOpts)
assert.Contains(t, dom.OuterHTML(result.ContentNode), `<a>Test link text.</a>This part of the text has to be long enough.`)
htmlStr = `<html><body><article><a>Segment 1</a><h1><a>Segment 2</a></h1><p>Segment 3</p></article></body></html>`
result, _ = Extract(strings.NewReader(htmlStr), linkOpts)
assert.Contains(t, result.ContentText, "1")
assert.Contains(t, result.ContentText, "2")
assert.Contains(t, result.ContentText, "3")
// Extracting document with links, from file
f, _ := os.Open(filepath.Join("test-files", "simple", "http_sample.html"))
bt, _ := io.ReadAll(f)
result, _ = Extract(bytes.NewReader(bt), zeroOpts)
assert.NotContains(t, dom.OuterHTML(result.ContentNode), "testlink.html")
result, _ = Extract(bytes.NewReader(bt), linkOpts)
assert.Contains(t, dom.OuterHTML(result.ContentNode), "testlink.html")
// Test license link
htmlStr = `<html><body><p>Test text under <a rel="license" href="">CC BY-SA license</a>.</p></body></html>`
result, _ = Extract(strings.NewReader(htmlStr), linkOpts)
assert.Contains(t, dom.OuterHTML(result.ContentNode), "<a>CC BY-SA license</a>")
// Link in p, length threshold
// var opts Options
htmlStr = `<html><body><article><p><a>` + strings.Repeat("abcd", 20) + `</a></p></article></body></html>`
opts := Options{Config: zeroConfig, Focus: Balanced}
result, _ = Extract(strings.NewReader(htmlStr), opts)
assert.Contains(t, dom.TextContent(result.ContentNode), "abcd")
opts = Options{Config: zeroConfig, Focus: FavorPrecision}
result, _ = Extract(strings.NewReader(htmlStr), opts)
assert.Empty(t, dom.TextContent(result.ContentNode))
}
func Test_ExtractionOptions(t *testing.T) {
var opts Options
var result *ExtractResult
htmlStr := `<html>
<head>
<meta http-equiv="content-language" content="EN" />
</head>
<body>
<div="article-body">
<p>Text.<!-- comment --></p>
</div>
</body>
</html>`
opts = Options{Config: zeroConfig}
result, _ = Extract(strings.NewReader(htmlStr), opts)
assert.NotNil(t, result)
opts = Options{HasEssentialMetadata: true, Config: zeroConfig}
result, _ = Extract(strings.NewReader(htmlStr), opts)
assert.Nil(t, result)
opts = Options{TargetLanguage: "de", Config: zeroConfig}
result, _ = Extract(strings.NewReader(htmlStr), opts)
assert.Nil(t, result)
// Try HtmlDate config
htmlStr = `<html><head/><body>` +
strings.Repeat(`<p>ABC def ghi jkl.</p>`, 1000) +
`<p>Posted on 1st Dec 2019<.</p></body></html>`
doc, _ := dom.FastParse(strings.NewReader(htmlStr))
dateOpts := htmldate.Options{UseOriginalDate: true}
opts = Options{Config: zeroConfig, HtmlDateOptions: &dateOpts}
meta := extractMetadata(doc, opts)
assert.NotZero(t, meta.Date)
dateOpts.SkipExtensiveSearch = true
meta = extractMetadata(doc, opts)
assert.Zero(t, meta.Date)
}
func Test_PrecisionRecall(t *testing.T) {
var opts Options
var result *ExtractResult
var htmlStr string
// Basic test
htmlStr = `<html><body><p>This here is the text.</p></body></html>`
opts = Options{Focus: FavorPrecision, Config: zeroConfig}
result, _ = Extract(strings.NewReader(htmlStr), opts)
assert.NotNil(t, result)
opts = Options{Focus: FavorRecall, Config: zeroConfig}
result, _ = Extract(strings.NewReader(htmlStr), opts)
assert.NotNil(t, result)
// Teaser text
htmlStr = `<html><body>
<div class="article-body">
<div class="teaser-content">
<p>This here is a teaser text.</p>
</div>
<p>This here is the text.</p>
</div>
</body></html>`
opts = Options{Focus: FavorRecall, Config: zeroConfig}
result, _ = Extract(strings.NewReader(htmlStr), opts)
assert.Contains(t, result.ContentText, "teaser text")
opts = Options{Focus: Balanced, Config: zeroConfig}
result, _ = Extract(strings.NewReader(htmlStr), opts)
assert.NotContains(t, result.ContentText, "teaser text")
opts = Options{Focus: FavorPrecision, Config: zeroConfig}
result, _ = Extract(strings.NewReader(htmlStr), opts)
assert.NotContains(t, result.ContentText, "teaser text")
// Never extracted
htmlStr = `<html><body><article><div><p>
<a href="test.html">1.</a>
<br />
<a href="test2.html">2.</a>
</p></div></article></body></html>`
opts = Options{Focus: FavorRecall, Config: zeroConfig}
result, _ = Extract(strings.NewReader(htmlStr), opts)
assert.NotContains(t, result.ContentText, "1")
opts = Options{Focus: FavorPrecision, Config: zeroConfig}
result, _ = Extract(strings.NewReader(htmlStr), opts)
assert.NotContains(t, result.ContentText, "1")
// Only found when favor recall
htmlStr = `<html><body>
<div class="article-body">
<p>content</p>
<p class="link">Test</p>
</div>
</body></html>`
opts = Options{Focus: FavorRecall, Config: zeroConfig}
result, _ = Extract(strings.NewReader(htmlStr), opts)
assert.Contains(t, result.ContentText, "content")
assert.Contains(t, result.ContentText, "Test")
opts = Options{Focus: FavorPrecision, Config: zeroConfig}
result, _ = Extract(strings.NewReader(htmlStr), opts)
assert.Contains(t, result.ContentText, "content")
assert.NotContains(t, result.ContentText, "Test")
htmlStr = `<html><body><article>
<aside><p>Here is the text.</p></aside>
</article></body></html>`
opts = Options{Focus: Balanced, Config: zeroConfig}
result, _ = Extract(strings.NewReader(htmlStr), opts)
assert.NotEqual(t, "Here is the text.", result.ContentText)
opts = Options{Focus: FavorRecall, Config: zeroConfig}
result, _ = Extract(strings.NewReader(htmlStr), opts)
assert.Equal(t, "Here is the text.", result.ContentText)
htmlStr = `<html><body><div>
<h2>Title</h2>
<small>Text.</small>
</div></body></html>`
opts = Options{Focus: FavorRecall, Config: zeroConfig, EnableFallback: true}
result, _ = Extract(strings.NewReader(htmlStr), opts)
assert.NotEmpty(t, result.ContentText)
htmlStr = `<html><body><div>
<span>Text.</span>
</div></body></html>`
opts = Options{Focus: FavorPrecision, Config: zeroConfig}
result, _ = Extract(strings.NewReader(htmlStr), opts)
assert.Empty(t, result.ContentText)
opts = Options{Focus: FavorRecall, Config: zeroConfig}
result, _ = Extract(strings.NewReader(htmlStr), opts)
assert.Equal(t, "Text.", result.ContentText)
}
func Test_TableProcessing(t *testing.T) {
var opts Options
var processedTable *html.Node
var nodeValues []string
potentialTags := duplicateMap(tagCatalog)
iterNodeValues := func(root *html.Node) []string {
var nodeValues []string
for _, node := range etree.Iter(root) {
nodeTag := dom.TagName(node)
nodeText := trim(etree.Text(node))
if nodeText == "" {
nodeValues = append(nodeValues, nodeTag)
} else {
nodeValues = append(nodeValues, nodeTag+"-"+nodeText)
}
}
return nodeValues
}
// Simple table
tableSimpleCell := etree.FromString(`<table><tr><td>cell1</td><td>cell2</td></tr><tr><td>cell3</td><td>cell4</td></tr></table>`)
processedTable = handleTable(tableSimpleCell, potentialTags, nil, defaultOpts)
assert.Equal(t, []string{"table", "tr", "td-cell1", "td-cell2", "tr", "td-cell3", "td-cell4"}, iterNodeValues(processedTable))
// If a cell contains 'exotic' tags, they are cleaned during the extraction
// Process and the content is merged with the parent e.g. <td>
tableCellWithChildren := etree.FromString(`<table><tr><td><p>text</p><p>more text</p></td></tr></table>`)
processedTable = handleTable(tableCellWithChildren, potentialTags, nil, defaultOpts)
assert.Equal(t, `<table><tr><td><p>text</p><p>more text</p></td></tr></table>`, dom.OuterHTML(processedTable))
// Complex table that hasn't been cleaned yet
complexPage := docFromStr(`
<html><body>
<article>
<table>
<tbody>
<tr>
<td><small>text<br></small>
<h4>more_text</h4>
</td>
<td><a href='link'>linktext</a></td>
</tr>
</tbody>
</table>
</article>
</body></html>`)
opts = Options{IncludeLinks: true, Config: zeroConfig}
result, _ := ExtractDocument(complexPage, opts)
assert.Contains(t, dom.OuterHTML(result.ContentNode), `<table><tr><td>text<h4>more_text</h4></td></tr></table>`)
// Table cell with text and child
tableCellWithTextAndChild := etree.FromString(`<table><tr><td>text<lb/><p>more text</p></td></tr></table>`)
processedTable = handleTable(tableCellWithTextAndChild, potentialTags, nil, defaultOpts)
assert.Equal(t, `<table><tr><td>text<p>more text</p></td></tr></table>`, dom.OuterHTML(processedTable))
// Table cell with link
tableCellWithLink := etree.FromString(`<table><tr><td><a href='test'>link</a></td></tr></table>`)
processedTable = handleTable(tableCellWithLink, potentialTags, nil, defaultOpts)
nodeValues = iterNodeValues(dom.QuerySelector(processedTable, "td"))
assert.Equal(t, []string{"td", "p"}, nodeValues)
// Table with head
tableWithHead := etree.FromString(`
<table>
<tr><th>Month</th><th>Days</th></tr>
<tr><td>January</td><td>31</td></tr>
<tr><td>February</td><td>28</td></tr>
</table>`)
processedTable = handleTable(tableWithHead, potentialTags, nil, defaultOpts)
assert.Equal(t, 3, len(dom.Children(processedTable)))
firstRow := dom.Children(processedTable)[0]
firstRowCells := dom.Children(firstRow)
assert.Equal(t, 2, len(firstRowCells))
assert.Equal(t, "th", dom.TagName(firstRowCells[0]))
assert.Equal(t, "th", dom.TagName(firstRowCells[1]))
assert.Equal(t, "Month", dom.TextContent(firstRowCells[0]))
assert.Equal(t, "Days", dom.TextContent(firstRowCells[1]))
// Table with head span
tableWithHeadSpan := etree.FromString(`
<table>
<tr>
<th>Name</th>
<th>Adress</th>
<th colspan="2">Phone</th>
</tr>
<tr>
<td>Jane Doe</td>
<td>[email protected]</td>
<td>phone 1</td>
<td>phone 2</td>
</tr>
</table>`)
processedTable = handleTable(tableWithHeadSpan, potentialTags, nil, defaultOpts)
assert.Equal(t, 2, len(dom.Children(processedTable)))
firstRow = dom.Children(processedTable)[0]
firstRowCells = dom.Children(firstRow)
assert.Equal(t, 3, len(firstRowCells))
assert.Equal(t, "th", dom.TagName(firstRowCells[0]))
assert.Equal(t, "th", dom.TagName(firstRowCells[1]))
assert.Equal(t, "th", dom.TagName(firstRowCells[2]))
// Table cell with formatting
tableCellWithFormatting := etree.FromString(`<table><tr><td><mark>highlighted text</mark></td></tr></table>`)
processedTable = handleTable(tableCellWithFormatting, potentialTags, nil, defaultOpts)
firstCell := dom.QuerySelector(processedTable, "td")
assert.NotNil(t, firstCell)
assert.Equal(t, dom.OuterHTML(firstCell), `<td><mark>highlighted text</mark></td>`)
// Table cell with span
tableCellWithSpan := etree.FromString(`<table><tr><td><span style='sth'>span text</span></td></tr></table>`)
processedTable = handleTable(tableCellWithSpan, potentialTags, nil, defaultOpts)
firstCell = dom.QuerySelector(processedTable, "td")
assert.NotNil(t, firstCell)
assert.Equal(t, dom.OuterHTML(firstCell), `<td><p></p></td>`)
// Table with nested elements
tableNestedElements := docFromStr(`