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xpathy.js
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xpathy.js
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/*
# XPathy
## version 0.1.1
XPathy is a CSS reprocessor that resolves selectors using XPath. This plugin will read CSS selectors that end with a `[xpath]` attribute and use JavaScript and XPath to determine whether or not to apply that style to elements matching the other part of that selector. For example, the XPath selector `//div` will always resolve to `div`, so a selector written for `div [xpath="//div"] {}` will always apply to each `div div {}` element.
By default, XPathy will reprocess selectors by watching the following events:
- `load`
- `resize`
- `input`
- `click`
To run XPathy whenever you want, use the `xpathy.load()` function in JS.
- https://github.com/tomhodgins/cssplus
Author: Tommy Hodgins
License: MIT
*/
// Uses Node, AMD or browser globals to create a module
(function (root, factory) {
if (typeof define === 'function' && define.amd) {
// AMD: Register as an anonymous module
define([], factory)
} else if (typeof module === 'object' && module.exports) {
// Node: Does not work with strict CommonJS, but
// only CommonJS-like environments that support module.exports,
// like Node
module.exports = factory()
} else {
// Browser globals (root is window)
root.xpathy = factory()
}
}(this, function() {
const xpathy = {}
xpathy.style = ''
xpathy.count = 0
xpathy.load = () => {
// Find (or create) style tag to populate
const style_tag = document.querySelector('[data-xpathy-style]') || (() => {
const tag = document.createElement('style')
tag.setAttribute('data-xpathy-style', '')
document.head.appendChild(tag)
return tag
})()
// Reset plugin styles and element count
xpathy.style = ''
xpathy.count = 0
// Reset count on [data-xpathy] elements in DOM
Array.from(document.querySelectorAll('[data-xpathy]'), tag => {
tag.setAttribute('data-xpathy', '')
})
xpathy.findRules()
// Populate style tag with style
style_tag.innerHTML = `\n${xpathy.style}\n`
}
xpathy.findRules = () => {
// For each stylesheet
Array.from(document.styleSheets, sheet => {
// For each rule
sheet.cssRules && Array.from(sheet.cssRules, rule => {
xpathy.process(rule)
})
})
}
xpathy.process = rule => {
// If rule is a qualified rule, process it
if (rule.type === 1) {
xpathy.style += xpathy.transform(rule)
}
// If rule is an at-rule, find all qualified rules inside
if (rule.type === 4) {
let css_rules = ''
// Remember media query text
let mediaText = rule.media.mediaText
// If there are qualified rules, find all rules
rule.cssRules && Array.from(rule.cssRules, mediaRule => {
css_rules += xpathy.transform(mediaRule)
})
// If there is at least one new rule, wrap in at-rule with media text
if (css_rules.length > 0) {
xpathy.style += `\n@media ${mediaText} {\n ${css_rules.replace(/^(.*)$/gmi,' $1')}\n}\n`
}
}
}
xpathy.transform = rule => {
let newRule = ''
let selector = rule.selectorText.replace(/\s*([^{]+)\s*{/gi, '$1')
let ruleText = rule.cssText.replace(/[^{]+\{([^}]*)\}/gi, '$1')
// Start a new list of matching rules
let ruleList = []
// If `[xpath=` is present anywhere in the selector
if (selector && selector.indexOf('[xpath=') !== -1) {
// Extract the full selector name and test
selector.replace(/^(.*)\[xpath=("(?:[^"]+)"|'(?:[^']+)')\].*/i, (string, selectorText, xpath) => {
xpath = xpath.replace(/^'([^']*)'$/m, '$1')
xpath = xpath.replace(/^"([^"]*)"$/m, '$1')
// Create new array to hold nodes selected by XPath
let list = new Array()
// use document.evaluate() to query DOM with our XPath
let nodes = document.evaluate(
xpath,
document,
null,
XPathResult.ORDERED_NODE_SNAPSHOT_TYPE,
null
)
// If at least one node matches our XPath
if (nodes) {
for (let i=0; i<nodes.snapshotLength; i++) {
// Add each element to our list
list.push(nodes.snapshotItem(i))
}
}
// If our list contains at least one node
if (list.length > 0) {
// For each tag matching the selector
list.forEach((tag, i) => {
// Increment the plugin element count
xpathy.count++
// Create a new selector for our new CSS rule
let newSelector = selector.replace(/^(.*\[)(xpath=(?:"[^"]*"|'[^']*'))(\].*)$/im, (string, before, test, after) => {
return `${before}data-xpathy~="${xpathy.count}"${after}`
})
// Mark matching element with attribute and plugin element count
let currentAttr = tag.getAttribute('data-xpathy')
tag.setAttribute('data-xpathy', `${currentAttr} ${xpathy.count}`)
// And add our new attribute to the selector list for that rule
ruleList.push(newSelector)
})
}
})
// If at least one element passed the test
if (ruleList.length > 0) {
newRule = `\n/* ${selector} */\n${ruleList} {\n ${ruleText.replace(/(; )([^\{])/g,';\n $2')}\n}\n`
}
}
return newRule
}
// Update every `load`, `resize`, `input`, and `click`
window.addEventListener('load', xpathy.load)
window.addEventListener('resize', xpathy.load)
window.addEventListener('input', xpathy.load)
window.addEventListener('click', xpathy.load)
return xpathy
}))