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import { sortFontsVariantValues } from './sort-fonts-variant-values'
/**
* Generate the Google Fonts URL given the requested weight(s), style(s) and additional variable axes
*/
export function getGoogleFontsUrl(
fontFamily: string,
axes: {
wght?: string[]
ital?: string[]
variableAxes?: [string, string][]
},
display: string
) {
// Variants are all combinations of weight and style, each variant will result in a separate font file
const variants: Array<[string, string][]> = []
if (axes.wght) {
for (const wght of axes.wght) {
if (!axes.ital) {
variants.push([['wght', wght], ...(axes.variableAxes ?? [])])
} else {
for (const ital of axes.ital) {
variants.push([
['ital', ital],
['wght', wght],
...(axes.variableAxes ?? []),
])
}
}
}
} else if (axes.variableAxes) {
// Variable fonts might not have a range of weights, just add optional variable axes in that case
variants.push([...axes.variableAxes])
}
// Google api requires the axes to be sorted, starting with lowercase words
if (axes.variableAxes) {
variants.forEach((variant) => {
variant.sort(([a], [b]) => {
const aIsLowercase = a.charCodeAt(0) > 96
const bIsLowercase = b.charCodeAt(0) > 96
if (aIsLowercase && !bIsLowercase) return -1
if (bIsLowercase && !aIsLowercase) return 1
return a > b ? 1 : -1
})
})
}
let url = `https://fonts.googleapis.com/css2?family=${fontFamily.replace(
/ /g,
'+'
)}`
if (variants.length > 0) {
url = `${url}:${variants[0].map(([key]) => key).join(',')}@${variants
.map((variant) => variant.map(([, val]) => val).join(','))
.sort(sortFontsVariantValues)
.join(';')}`
}
url = `${url}&display=${display}`
return url
}
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