// Problem: https://github.com/animatedjs/animated/pull/102
// Solution: https://stackoverflow.com/questions/638565/parsing-scientific-notation-sensibly/658662
export const numberRegex = /[+\-]?(?:0|[1-9]\d*)(?:\.\d*)?(?:[eE][+\-]?\d+)?/g

// Covers rgb, rgba, hsl, hsla
// Taken from https://gist.github.com/olmokramer/82ccce673f86db7cda5e
export const colorRegex =
  /(#(?:[0-9a-f]{2}){2,4}|(#[0-9a-f]{3})|(rgb|hsl)a?\((-?\d+%?[,\s]+){2,3}\s*[\d\.]+%?\))/gi

// Gets numbers with units when specified
export const unitRegex = new RegExp(`(${numberRegex.source})(%|[a-z]+)`, 'i')

// get values of rgba string
export const rgbaRegex =
  /rgba\(([0-9\.-]+), ([0-9\.-]+), ([0-9\.-]+), ([0-9\.-]+)\)/gi

/**
 * Parse special CSS variable format into a CSS token and a fallback.
 *
 * ```
 * `var(--foo, #fff)` => [`--foo`, '#fff']
 * ```
 *
 */
export const cssVariableRegex =
  /var\((--[a-zA-Z0-9-_]+),? ?([a-zA-Z0-9 ()%#.,-]+)?\)/