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- <span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">const unquote = require('unquote')
- const systemFontKeywords = require('css-system-font-keywords')
- const fontWeightKeywords = require('css-font-weight-keywords')
- const fontStyleKeywords = require('css-font-style-keywords')
- const fontStretchKeywords = require('css-font-stretch-keywords')
- import * as cssListHelpers from 'css-list-helpers'
- import * as helpers from './helpers'
-
- export interface ISystemFont {
- system: string
- }
-
- export interface IFont {
- style?: string
- variant?: string
- weight?: string
- stretch?: string
- size?: string
- lineHeight?: string | number
- family?: string[]
- }
-
- const errorPrefix = '[parse-css-font]'
-
- const firstDeclarations: ['style', 'weight', 'stretch', 'variant'] = [
- 'style',
- 'weight',
- 'stretch',
- 'variant',
- ]
-
- export default function parseCSSFont(value: string) {
- if (typeof value !== 'string') {
- throw error('Expected a string.', TypeError)
- }
-
- if (value === '') {
- throw error('Cannot parse an empty string.')
- }
-
- if (systemFontKeywords.indexOf(value) !== -1) {
- return { system: value } as ISystemFont
- }
-
- const font: IFont = {
- lineHeight: 'normal',
- stretch: '',
- style: '',
- variant: '',
- weight: '',
- }
-
- const consumers = [style, weight, stretch, variant]
- const tokens = cssListHelpers.splitBySpaces(value)
- nextToken: for (
- let token = tokens.shift();
- !!token;
- token = tokens.shift()
- ) {
- if (token === 'normal') {
- continue
- }
-
- for (const consume of consumers) {
- if (consume(token)) {
- continue nextToken
- }
- }
-
- const parts = cssListHelpers.split(token, ['/'])
- font.size = parts[0]
- if (!!parts[1]) {
- font.lineHeight = parseLineHeight(parts[1])
- } else if (tokens[0] === '/') {
- tokens.shift()
- font.lineHeight = parseLineHeight(tokens.shift() as string)
- }
- if (!tokens.length) {
- throw error('Missing required font-family.')
- }
- font.family = cssListHelpers.splitByCommas(tokens.join(' ')).map(unquote)
-
- for (const name of firstDeclarations) {
- font[name] = font[name] || 'normal'
- }
-
- return font
- }
-
- throw error('Missing required font-size.')
-
- function style(token: string) {
- if (fontStyleKeywords.indexOf(token) === -1) {
- return
- }
- if (font.style) {
- throw error('Font style already defined.')
- }
- return (font.style = token)
- }
-
- function weight(token: string) {
- if (fontWeightKeywords.indexOf(token) === -1) {
- return
- }
- if (font.weight) {
- throw error('Font weight already defined.')
- }
- return (font.weight = token)
- }
-
- function stretch(token: string) {
- if (fontStretchKeywords.indexOf(token) === -1) {
- return
- }
- if (font.stretch) {
- throw error('Font stretch already defined.')
- }
- return (font.stretch = token)
- }
-
- function variant(token: string) {
- return (
- !helpers.isSize(token) &&
- (font.variant = font.variant ? [font.variant, token].join(' ') : token)
- )
- }
- }
-
- function error(
- message: string,
- ErrorType: typeof Error | typeof TypeError = Error,
- ) {
- return new ErrorType(`${errorPrefix} ${message}`)
- }
-
- function parseLineHeight(value: string) {
- const parsed = parseFloat(value)
- if (parsed.toString() === value) {
- return parsed
- }
- return value
- }
-
- // @ts-ignore
- module.exports = Object.assign(exports.default, exports)
- </pre></td></tr>
- </table></pre>
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