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145 lines
3.3 KiB
Markdown
145 lines
3.3 KiB
Markdown
# cascadia
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[](https://travis-ci.org/andybalholm/cascadia)
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The Cascadia package implements CSS selectors for use with the parse trees produced by the html package.
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To test CSS selectors without writing Go code, check out [cascadia](https://github.com/suntong/cascadia) the command line tool, a thin wrapper around this package.
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[Refer to godoc here](https://godoc.org/github.com/andybalholm/cascadia).
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## Example
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The following is an example of how you can use Cascadia.
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```go
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package main
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import (
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"fmt"
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"log"
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"strings"
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"github.com/andybalholm/cascadia"
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"golang.org/x/net/html"
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)
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var pricingHtml string = `
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<div class="card mb-4 box-shadow">
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<div class="card-header">
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<h4 class="my-0 font-weight-normal">Free</h4>
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</div>
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<div class="card-body">
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<h1 class="card-title pricing-card-title">$0/mo</h1>
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<ul class="list-unstyled mt-3 mb-4">
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<li>10 users included</li>
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<li>2 GB of storage</li>
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<li><a href="https://example.com">See more</a></li>
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</ul>
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</div>
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</div>
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<div class="card mb-4 box-shadow">
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<div class="card-header">
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<h4 class="my-0 font-weight-normal">Pro</h4>
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</div>
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<div class="card-body">
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<h1 class="card-title pricing-card-title">$15/mo</h1>
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<ul class="list-unstyled mt-3 mb-4">
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<li>20 users included</li>
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<li>10 GB of storage</li>
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<li><a href="https://example.com">See more</a></li>
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</ul>
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</div>
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</div>
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<div class="card mb-4 box-shadow">
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<div class="card-header">
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<h4 class="my-0 font-weight-normal">Enterprise</h4>
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</div>
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<div class="card-body">
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<h1 class="card-title pricing-card-title">$29/mo</h1>
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<ul class="list-unstyled mt-3 mb-4">
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<li>30 users included</li>
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<li>15 GB of storage</li>
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<li><a>See more</a></li>
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</ul>
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</div>
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</div>
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`
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func Query(n *html.Node, query string) *html.Node {
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sel, err := cascadia.Parse(query)
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if err != nil {
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return &html.Node{}
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}
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return cascadia.Query(n, sel)
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}
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func QueryAll(n *html.Node, query string) []*html.Node {
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sel, err := cascadia.Parse(query)
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if err != nil {
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return []*html.Node{}
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}
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return cascadia.QueryAll(n, sel)
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}
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func AttrOr(n *html.Node, attrName, or string) string {
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for _, a := range n.Attr {
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if a.Key == attrName {
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return a.Val
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}
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}
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return or
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}
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func main() {
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doc, err := html.Parse(strings.NewReader(pricingHtml))
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("List of pricing plans:\n\n")
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for i, p := range QueryAll(doc, "div.card.mb-4.box-shadow") {
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planName := Query(p, "h4").FirstChild.Data
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price := Query(p, ".pricing-card-title").FirstChild.Data
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usersIncluded := Query(p, "li:first-child").FirstChild.Data
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storage := Query(p, "li:nth-child(2)").FirstChild.Data
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detailsUrl := AttrOr(Query(p, "li:last-child a"), "href", "(No link available)")
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fmt.Printf(
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"Plan #%d\nName: %s\nPrice: %s\nUsers: %s\nStorage: %s\nDetails: %s\n\n",
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i+1,
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planName,
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price,
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usersIncluded,
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storage,
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detailsUrl,
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)
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}
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}
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```
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The output is:
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```
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List of pricing plans:
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Plan #1
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Name: Free
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Price: $0/mo
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Users: 10 users included
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Storage: 2 GB of storage
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Details: https://example.com
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Plan #2
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Name: Pro
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Price: $15/mo
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Users: 20 users included
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Storage: 10 GB of storage
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Details: https://example.com
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Plan #3
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Name: Enterprise
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Price: $29/mo
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Users: 30 users included
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Storage: 15 GB of storage
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Details: (No link available)
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```
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