60 lines
2.2 KiB
JavaScript
Executable file
60 lines
2.2 KiB
JavaScript
Executable file
import postcss from 'postcss';
|
|
import valueParser from 'postcss-values-parser';
|
|
|
|
var index = postcss.plugin('postcss-double-position-gradients', opts => {
|
|
const preserve = 'preserve' in Object(opts) ? Boolean(opts.preserve) : true;
|
|
return root => {
|
|
// walk every declaration
|
|
root.walkDecls(decl => {
|
|
const originalValue = decl.value; // if the declaration value contains a gradient
|
|
|
|
if (gradientFunctionRegExp.test(originalValue)) {
|
|
const ast = valueParser(originalValue).parse(); // walk every function in the declaration value
|
|
|
|
ast.walkFunctionNodes(fn => {
|
|
// if the function is a gradient
|
|
if (gradientFunctionNameRegExp.test(fn.value)) {
|
|
const nodes = fn.nodes.slice(1, -1); // walk every argument to the function
|
|
|
|
nodes.forEach((node, index) => {
|
|
const node1back = Object(nodes[index - 1]);
|
|
const node2back = Object(nodes[index - 2]);
|
|
const isDoublePositionLength = node2back.type && node1back.type === 'number' && node.type === 'number'; // if the argument concludes a double-position gradient
|
|
|
|
if (isDoublePositionLength) {
|
|
// insert the fallback colors
|
|
const color = node2back.clone();
|
|
const comma = valueParser.comma({
|
|
value: ',',
|
|
raws: {
|
|
after: ' '
|
|
}
|
|
});
|
|
fn.insertBefore(node, comma);
|
|
fn.insertBefore(node, color);
|
|
}
|
|
});
|
|
}
|
|
});
|
|
const modifiedValue = ast.toString(); // if the value has changed due to double-position gradients
|
|
|
|
if (originalValue !== modifiedValue) {
|
|
// add the fallback value
|
|
decl.cloneBefore({
|
|
value: modifiedValue
|
|
}); // conditionally remove the double-position gradient
|
|
|
|
if (!preserve) {
|
|
decl.remove();
|
|
}
|
|
}
|
|
}
|
|
});
|
|
};
|
|
});
|
|
const gradientFunctionRegExp = /(repeating-)?(conic|linear|radial)-gradient\([\W\w]*\)/i;
|
|
const gradientFunctionNameRegExp = /^(repeating-)?(conic|linear|radial)-gradient$/i;
|
|
|
|
export default index;
|
|
//# sourceMappingURL=index.es.mjs.map
|