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colours.js
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colours.js
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const exporter = require('sass-export').exporter
function parseSCSS (filename) {
return exporter({
inputFiles: ['node_modules/govuk-frontend/govuk/settings/' + filename],
includePaths: ['node_modules/govuk-frontend/govuk/settings/']
}).getStructured()
}
function getColourFromSass (sass, variableName) {
return sass.variables.find(variable => variable.name === variableName).compiledValue
}
/**
* Get colour palette
*
* Extracts the colour palette from the $govuk-colours map defined in
* settings/_colours-palette.scss in GOV.UK Frontend
*
* @return Object mapping colour names to their hexadecimal values
*/
const palette = function () {
const paletteSass = parseSCSS('_colours-palette.scss')
const paletteMap = paletteSass.variables.find(variable => variable.name === '$_govuk-colour-palette-modern').mapValue
// Reduce the array of Sass map entry objects down into a single object
return paletteMap.reduce((accumulator, mapEntry) => {
accumulator[mapEntry.name] = mapEntry.compiledValue
return accumulator
}, {})
}
/**
* Get applied colours
*
* Adds colour definitions to the colours data defined in data/colours.json,
* looking up the hexadecimal values from their definitions in
* settings/_colours-applied.scss in GOV.UK Frontend
*
* Example output:
*
* ```
* { Text: [
* { name: '$govuk-text-colour', colour: '#0b0c0c', 'notes': '' },
* { name: '$govuk-secondary-text-colour', colour: '#6f777b', 'notes': '' },
* ],
* ...
* }
* ```
*
* @return Object containing 'groups' of colours
*/
const applied = function () {
const data = require('../data/colours.json')
const sass = parseSCSS('_colours-applied.scss')
for (const group in data) {
data[group] = data[group].map(colour => {
colour.colour = getColourFromSass(sass, colour.name)
return colour
})
}
return data
}
module.exports = {
applied: applied(),
palette: palette()
}