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Plugins (190)

html

stable

Parse and manipulate HTML documents using CSS selectors, and escape or create HTML elements.

use plugin html
18 functions Web
Runs with the native Zolo host

Plugin snippets can be edited in the Playground, but native capabilities are executed locally with the Zolo CLI.

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Functions (18)
  1. parse_select Select elements by CSS selector, return HTML
  2. parse_select_text Select elements, return text content
  3. parse_select_attr Select elements, return attribute values
  4. extract_links Extract all anchor links with text and href
  5. extract_images Extract all images with src and alt
  6. text_content Get all text from entire document
  7. select_nth Get text of nth CSS selector match
  8. select_count Count elements matching a selector
  9. outer_html Get full outer HTML of matching elements
  10. extract_meta Extract all meta tag name/content pairs
  11. extract_title Extract the page title string
  12. extract_scripts Extract script tags with src and inline code
  13. extract_styles Extract stylesheet links and inline CSS
  14. strip_tags Strip all HTML tags, return plain text
  15. extract_tables Extract HTML tables as nested arrays
  16. escape Escape special characters as HTML entities
  17. unescape Decode HTML entities back to characters
  18. create_element Build an HTML element string

From import to result

  1. 01Import only what you use
  2. 02Copy the smallest example
  3. 03Run it with the Zolo CLI

Overview

html is a stateless HTML toolkit built on a real CSS-selector engine, so you work with documents the same way a browser or scraper would: feed in an HTML string, query it with familiar selectors like "a", ".card", or "link[rel='stylesheet']", and get back plain Zolo strings and tables. There are no handles or objects to manage — every function takes the document as a string argument and returns ordinary values, so each call is independent and re-parses what it needs.

The functions fall into three groups: selector queries (parse_select, parse_select_text, parse_select_attr, select_nth, select_count, outer_html) that pull elements out of a document; high-level extractors (extract_links, extract_images, extract_meta, extract_title, extract_scripts, extract_styles, extract_tables, text_content, strip_tags) that return structured data for common page parts; and string builders (escape, unescape, create_element) for safely producing HTML. Reach for it whenever you need to scrape, inspect, or assemble HTML without an external parser.

Common patterns

Scrape a navigation menu by pulling every link with its text and target:

use plugin html::{extract_links, select_count}

let page = "<nav><a href='/home'>Home</a><a href='/blog'>Blog</a></nav>"
let links = extract_links(page)
print("found {select_count(page, "a")} links")
for link in links {
  print("{link["text"]} -> {link["href"]}")
}

Read a page's metadata in one pass — title plus every <meta> tag:

use plugin html::{extract_title, extract_meta}

let page = "<head><title>Cats</title><meta name='description' content='All about cats'></head>"
print("title: {extract_title(page)}")
for m in extract_meta(page) {
  print("{m["name"]} = {m["content"]}")
}

Build an element safely by escaping untrusted text before nesting it:

use plugin html::{escape, create_element}

let comment = escape("<b>hi</b> & bye")
let safe = create_element("p", #{"class": "comment"}, comment)
print(safe)

parse_select(html, selector) → table

Select elements by CSS selector, return HTML

Parses the HTML document and returns a table of outer HTML strings for each element matching the CSS selector. Keys are 1-indexed integers.

use plugin html::{parse_select}

let doc = "<ul><li>Alice</li><li>Bob</li></ul>"
let items = parse_select(doc, "li")
print(items[1])
print(items[2])

parse_select_text(html, selector) → table

Select elements, return text content

Like parse_select but returns the text content of each matched element instead of its HTML.

use plugin html::{parse_select_text}

let doc = "<div><p>Hello <b>World</b></p><p>Goodbye</p></div>"
let texts = parse_select_text(doc, "p")
print(texts[1])

parse_select_attr(html, selector, attr_name) → table

Select elements, return attribute values

Returns a table of attribute values for a given attribute name across all elements matching the selector. Elements without the attribute are skipped.

use plugin html::{parse_select_attr}

let doc = "<a href='/home'>Home</a><a href='/about'>About</a>"
let hrefs = parse_select_attr(doc, "a", "href")
print(hrefs[1])
print(hrefs[2])

Use any attribute name and a more specific selector to read, say, image sources inside a gallery:

use plugin html::{parse_select_attr}

let doc = "<div class='gallery'><img src='1.png'><img src='2.png'></div>"
let srcs = parse_select_attr(doc, ".gallery img", "src")
print(srcs[1])

extract_images(html) → table

Extract all images with src and alt

Returns a table of {src, alt} tables for every <img> element in the document.

use plugin html::{extract_images}

let doc = "<img src='logo.png' alt='Logo'><img src='banner.jpg' alt=''>"
let imgs = extract_images(doc)
print(imgs[1]["src"])

text_content(html) → string

Get all text from entire document

Concatenates all text nodes in the document and returns a single string.

use plugin html::{text_content}

let doc = "<h1>Title</h1><p>Body text here.</p>"
let text = text_content(doc)
print(text)

select_nth(html, selector, n) → string

Get text of nth CSS selector match

Returns the text content of the nth match (1-indexed) of the CSS selector. Returns nil if there is no nth match.

use plugin html::{select_nth}

let doc = "<ul><li>First</li><li>Second</li><li>Third</li></ul>"
let second = select_nth(doc, "li", 2)
print(second)

select_count(html, selector) → number

Count elements matching a selector

Counts how many elements in the document match the given CSS selector.

use plugin html::{select_count}

let doc = "<p>One</p><p>Two</p><p>Three</p>"
let n = select_count(doc, "p")
print("Paragraph count: {n}")

Pair it with a class selector to check whether a page contains a given widget before doing more work:

use plugin html::{select_count}

let doc = "<div class='alert'>Warning</div><div class='alert'>Error</div>"
if select_count(doc, ".alert") > 0 {
  print("page has alerts")
}

outer_html(html, selector) → table

Get full outer HTML of matching elements

Returns a table of full outer HTML strings (including the element tag itself) for each element matching the selector.

use plugin html::{outer_html}

let doc = "<div class='card'><span>Hi</span></div>"
let results = outer_html(doc, ".card")
print(results[1])

extract_meta(html) → table

Extract all meta tag name/content pairs

Returns a table of {name, content} tables for every <meta> tag, using the name or property attribute as the key.

use plugin html::{extract_meta}

let doc = "<meta name='description' content='Page about cats'><meta property='og:title' content='Cats'>"
let metas = extract_meta(doc)
print(metas[1]["name"])
print(metas[1]["content"])

extract_title(html) → string

Extract the page title string

Returns the text content of the first <title> element, or an empty string if none exists.

use plugin html::{extract_title}

let doc = "<html><head><title>My Page</title></head><body></body></html>"
let title = extract_title(doc)
print(title)

extract_scripts(html) → table

Extract script tags with src and inline code

Returns a table of {src, inline_code} tables for every <script> tag. External scripts have src set; inline scripts have inline_code set.

use plugin html::{extract_scripts}

let doc = "<script src='/app.js'></script><script>console.log('hi')</script>"
let scripts = extract_scripts(doc)
print(scripts[1]["src"])
print(scripts[2]["inline_code"])

extract_styles(html) → table

Extract stylesheet links and inline CSS

Returns a table of {href, inline_css} tables for every <link rel="stylesheet"> and <style> element.

use plugin html::{extract_styles}

let doc = "<link rel='stylesheet' href='/style.css'><style>body { margin: 0 }</style>"
let styles = extract_styles(doc)
print(styles[1]["href"])
print(styles[2]["inline_css"])

strip_tags(html) → string

Strip all HTML tags, return plain text

Removes all HTML tags and returns normalized plain text with whitespace collapsed.

use plugin html::{strip_tags}

let doc = "<h1>Hello</h1>  <p>World  and  beyond.</p>"
let plain = strip_tags(doc)
print(plain)

extract_tables(html) → table

Extract HTML tables as nested arrays

Extracts all <table> elements as nested arrays. Returns a table of tables of rows, where each row is a table of cell text strings.

use plugin html::{extract_tables}

let doc = "<table><tr><th>Name</th><th>Age</th></tr><tr><td>Alice</td><td>30</td></tr></table>"
let tables = extract_tables(doc)
let row1 = tables[1][1]
print(row1[1])
print(row1[2])

escape(text) → string

Escape special characters as HTML entities

Escapes &, <, >, ", and ' into their HTML entity equivalents, safe for inserting into HTML.

use plugin html::{escape}

let safe = escape("<script>alert('xss')</script>")
print(safe)

Escape user input before interpolating it into markup you build by hand:

use plugin html::{escape}

let name = "Tom & \"Jerry\""
print("<span>{escape(name)}</span>")

unescape(text) → string

Decode HTML entities back to characters

Decodes common HTML entities (&amp;, &lt;, &gt;, &quot;, &#x27;, &nbsp;, etc.) back to their original characters.

use plugin html::{unescape}

let raw = unescape("Tom &amp; Jerry &lt;3")
print(raw)

create_element(tag, attrs, inner_html) → string

Build an HTML element string

Builds an HTML element string. Pass a table for attrs (string key/value pairs) and a string for inner_html. Void tags (br, img, input, etc.) are self-closed.

use plugin html::{create_element}

let link = create_element("a", #{"href": "/home", "class": "nav"}, "Home")
print(link)

let br = create_element("br", nil, nil)
print(br)
View source code

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