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535c97e8cf
[frontend] import meta tag processing from das7pads fork GitOrigin-RevId: ca74ff9fbbcb51091a626a45468ff3d24d6136ca
48 lines
1.3 KiB
JavaScript
48 lines
1.3 KiB
JavaScript
import _ from 'lodash'
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// cache for parsed values
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const cache = new Map()
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export default function getMeta(name, fallback) {
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if (cache.has(name)) return cache.get(name)
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const element = document.head.querySelector(`meta[name="${name}"]`)
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if (!element) {
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return fallback
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}
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const plainTextValue = element.content
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let value
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switch (element.dataset.type) {
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case 'boolean':
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// in pug: content=false -> no content field
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// in pug: content=true -> empty content field
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value = element.hasAttribute('content')
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break
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case 'json':
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if (!plainTextValue) {
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// JSON.parse('') throws
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value = undefined
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} else {
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value = JSON.parse(plainTextValue)
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}
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break
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default:
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value = plainTextValue
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}
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cache.set(name, value)
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return value
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}
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function convertMetaToWindowAttributes() {
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window.data = window.data || {}
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Array.from(document.querySelectorAll('meta[name^="ol-"]'))
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.map(element => element.name)
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// process short labels before long ones:
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// e.g. assign 'sharelatex' before 'sharelatex.templates'
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.sort()
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.forEach(nameWithNamespace => {
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const label = nameWithNamespace.slice('ol-'.length)
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_.set(window, label, getMeta(nameWithNamespace))
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_.set(window.data, label, getMeta(nameWithNamespace))
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})
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}
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convertMetaToWindowAttributes()
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