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const matcher = /^(var\()?((--[\w\d-]*?)(-opacity_([\d_]+)?)?)\)?$/i;
export function isCssVar(css: string): boolean
{
return !!css.trim().match(matcher);
}
type cssVar = {
full: string,
name: string,
opacity: number,
};
export function parseCssVar(css: string): ?cssVar
{
const matches = css.trim().match(matcher);
if (!!matches)
{
const cssVar = {
full: matches[2],
name: matches[3],
};
if (matches[3])
{
const cssVarWithOpacity = '--primary-opacity-0_';
const cssVarWithOpacity0 = '--primary-opacity-0';
if (matches[3].startsWith(cssVarWithOpacity0) && !matches[3].startsWith(cssVarWithOpacity))
{
cssVar.opacity = 0;
}
if (matches[3].startsWith(cssVarWithOpacity))
{
let newOpacity = matches[3].substr(cssVarWithOpacity.length);
if (newOpacity.length === 1 && newOpacity !== 0)
{
newOpacity = newOpacity / 10;
}
if (newOpacity.length === 2)
{
newOpacity = newOpacity / 100;
}
cssVar.opacity = newOpacity;
}
}
if(matches[5])
{
cssVar.opacity = +parseFloat(matches[5].replace('_', '.')).toFixed(1);
}
return cssVar;
}
return null;
}