ukamnya
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microdata
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replace html parser with golang.org/x/net/html

master
Ian Davis 2016-10-20 16:51:21 +01:00
parent 5e88f404e0
commit 2433e40d1e
3 changed files with 121 additions and 106 deletions
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5
README.md
View File

@ -46,16 +46,17 @@ Extract microdata from a webpage and print the result as JSON
import (
"bytes"
"github.com/iand/microdata"
"io/ioutil"
"net/http"
"net/url"
"os"
"github.com/iand/microdata"
)
func main() {
baseUrl, _ := url.Parse("http://tagger.steve.museum/steve/object/44863?offset=6")
baseUrl, _ := url.Parse("http://www.designhive.com/blog/using-schemaorg-microdata")
resp, _ := http.Get(baseUrl.String())
defer resp.Body.Close()

92
microdata.go
View File

@ -9,13 +9,13 @@ package microdata
import (
"bytes"
"code.google.com/p/go-html-transform/h5"
"code.google.com/p/go.net/html"
"code.google.com/p/go.net/html/atom"
"encoding/json"
"io"
"net/url"
"strings"
"golang.org/x/net/html"
"golang.org/x/net/html/atom"
)
type ValueList []interface{}
@ -37,18 +37,18 @@ func NewItem() *Item {
}
// Add a string type item property value
func (self *Item) AddString(property string, value string) {
self.Properties[property] = append(self.Properties[property], value)
func (i *Item) AddString(property string, value string) {
i.Properties[property] = append(i.Properties[property], value)
}
// Add an Item type item property value
func (self *Item) AddItem(property string, value *Item) {
self.Properties[property] = append(self.Properties[property], value)
func (i *Item) AddItem(property string, value *Item) {
i.Properties[property] = append(i.Properties[property], value)
}
// Add a type to the item
func (self *Item) AddType(value string) {
self.Types = append(self.Types, value)
func (i *Item) AddType(value string) {
i.Types = append(i.Types, value)
}
// Represents a set of microdata items
@ -64,13 +64,13 @@ func NewMicrodata() *Microdata {
}
// Add an item to the microdata set
func (self *Microdata) AddItem(value *Item) {
self.Items = append(self.Items, value)
func (m *Microdata) AddItem(value *Item) {
m.Items = append(m.Items, value)
}
// Convert the microdata set to JSON
func (self *Microdata) Json() ([]byte, error) {
b, err := json.Marshal(self)
func (m *Microdata) Json() ([]byte, error) {
b, err := json.Marshal(m)
if err != nil {
return nil, err
}
@ -79,7 +79,7 @@ func (self *Microdata) Json() ([]byte, error) {
// An HTML parser that extracts microdata
type Parser struct {
p *h5.Tree
r io.Reader
data *Microdata
base *url.URL
identifiedNodes map[string]*html.Node
@ -89,23 +89,25 @@ type Parser struct {
// r is a reader over an HTML document
// base is the base URL for resolving relative URLs
func NewParser(r io.Reader, base *url.URL) *Parser {
p, _ := h5.New(r)
return &Parser{
p: p,
r: r,
data: NewMicrodata(),
base: base,
}
}
// Parse the document and return a Microdata set
func (self *Parser) Parse() (*Microdata, error) {
tree := self.p
func (p *Parser) Parse() (*Microdata, error) {
tree, err := html.Parse(p.r)
if err != nil {
return nil, err
}
topLevelItemNodes := make([]*html.Node, 0)
self.identifiedNodes = make(map[string]*html.Node, 0)
p.identifiedNodes = make(map[string]*html.Node, 0)
tree.Walk(func(n *html.Node) {
walk(tree, func(n *html.Node) {
if n.Type == html.ElementNode {
if _, exists := getAttr("itemscope", n); exists {
if _, exists := getAttr("itemprop", n); !exists {
topLevelItemNodes = append(topLevelItemNodes, n)
@ -113,13 +115,14 @@ func (self *Parser) Parse() (*Microdata, error) {
}
if id, exists := getAttr("id", n); exists {
self.identifiedNodes[id] = n
p.identifiedNodes[id] = n
}
}
})
for _, node := range topLevelItemNodes {
item := NewItem()
self.data.Items = append(self.data.Items, item)
p.data.Items = append(p.data.Items, item)
if itemtypes, exists := getAttr("itemtype", node); exists {
for _, itemtype := range strings.Split(strings.TrimSpace(itemtypes), " ") {
itemtype = strings.TrimSpace(itemtype)
@ -129,7 +132,7 @@ func (self *Parser) Parse() (*Microdata, error) {
}
// itemid only valid when itemscope and itemtype are both present
if itemid, exists := getAttr("itemid", node); exists {
if parsedUrl, err := self.base.Parse(itemid); err == nil {
if parsedUrl, err := p.base.Parse(itemid); err == nil {
item.ID = parsedUrl.String()
}
}
@ -140,22 +143,22 @@ func (self *Parser) Parse() (*Microdata, error) {
for _, itemref := range strings.Split(strings.TrimSpace(itemrefs), " ") {
itemref = strings.TrimSpace(itemref)
if refnode, exists := self.identifiedNodes[itemref]; exists {
self.readItem(item, refnode)
if refnode, exists := p.identifiedNodes[itemref]; exists {
p.readItem(item, refnode)
}
}
}
for child := node.FirstChild; child != nil; {
self.readItem(item, child)
p.readItem(item, child)
child = child.NextSibling
}
}
return self.data, nil
return p.data, nil
}
func (self *Parser) readItem(item *Item, node *html.Node) {
func (p *Parser) readItem(item *Item, node *html.Node) {
if itemprop, exists := getAttr("itemprop", node); exists {
if _, exists := getAttr("itemscope", node); exists {
subitem := NewItem()
@ -164,14 +167,14 @@ func (self *Parser) readItem(item *Item, node *html.Node) {
for _, itemref := range strings.Split(strings.TrimSpace(itemrefs), " ") {
itemref = strings.TrimSpace(itemref)
if refnode, exists := self.identifiedNodes[itemref]; exists {
self.readItem(subitem, refnode)
if refnode, exists := p.identifiedNodes[itemref]; exists {
p.readItem(subitem, refnode)
}
}
}
for child := node.FirstChild; child != nil; {
self.readItem(subitem, child)
p.readItem(subitem, child)
child = child.NextSibling
}
@ -184,7 +187,8 @@ func (self *Parser) readItem(item *Item, node *html.Node) {
return
} else {
}
var propertyValue string
switch node.DataAtom {
@ -194,14 +198,14 @@ func (self *Parser) readItem(item *Item, node *html.Node) {
}
case atom.Audio, atom.Embed, atom.Iframe, atom.Img, atom.Source, atom.Track, atom.Video:
if urlValue, exists := getAttr("src", node); exists {
if parsedUrl, err := self.base.Parse(urlValue); err == nil {
if parsedUrl, err := p.base.Parse(urlValue); err == nil {
propertyValue = parsedUrl.String()
}
}
case atom.A, atom.Area, atom.Link:
if urlValue, exists := getAttr("href", node); exists {
if parsedUrl, err := self.base.Parse(urlValue); err == nil {
if parsedUrl, err := p.base.Parse(urlValue); err == nil {
propertyValue = parsedUrl.String()
}
}
@ -220,7 +224,7 @@ func (self *Parser) readItem(item *Item, node *html.Node) {
default:
var text bytes.Buffer
h5.WalkNodes(node, func(n *html.Node) {
walk(node, func(n *html.Node) {
if n.Type == html.TextNode {
text.WriteString(n.Data)
}
@ -240,10 +244,8 @@ func (self *Parser) readItem(item *Item, node *html.Node) {
}
}
for child := node.FirstChild; child != nil; {
self.readItem(item, child)
p.readItem(item, child)
child = child.NextSibling
}
@ -257,3 +259,15 @@ func getAttr(name string, node *html.Node) (string, bool) {
}
return "", false
}
func walk(parent *html.Node, fn func(n *html.Node)) {
if parent == nil {
return
}
fn(parent)
for child := parent.FirstChild; child != nil; {
walk(child, fn)
child = child.NextSibling
}
}

2
microdata_test.go
View File

@ -55,7 +55,7 @@ func TestParseActuallyParses(t *testing.T) {
item := ParseOneItem(html, t)
if item.Properties["name"][0].(string) != "Daniel" {
t.Errorf("Property value not found")
t.Errorf("got %v, wanted %s", item.Properties["name"][0], "Daniel")
}
}