[6a3a178] | 1 | import postcss from 'postcss';
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| 2 | import parser from 'postcss-values-parser';
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| 3 | import { lab2rgb } from '@csstools/convert-colors';
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| 4 |
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| 5 | function _slicedToArray(arr, i) {
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| 6 | return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest();
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| 7 | }
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| 8 |
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| 9 | function _arrayWithHoles(arr) {
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| 10 | if (Array.isArray(arr)) return arr;
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| 11 | }
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| 12 |
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| 13 | function _iterableToArrayLimit(arr, i) {
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| 14 | var _arr = [];
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| 15 | var _n = true;
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| 16 | var _d = false;
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| 17 | var _e = undefined;
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| 18 |
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| 19 | try {
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| 20 | for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {
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| 21 | _arr.push(_s.value);
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| 22 |
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| 23 | if (i && _arr.length === i) break;
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| 24 | }
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| 25 | } catch (err) {
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| 26 | _d = true;
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| 27 | _e = err;
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| 28 | } finally {
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| 29 | try {
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| 30 | if (!_n && _i["return"] != null) _i["return"]();
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| 31 | } finally {
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| 32 | if (_d) throw _e;
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| 33 | }
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| 34 | }
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| 35 |
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| 36 | return _arr;
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| 37 | }
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| 38 |
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| 39 | function _nonIterableRest() {
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| 40 | throw new TypeError("Invalid attempt to destructure non-iterable instance");
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| 41 | }
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| 42 |
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| 43 | var index = postcss.plugin('postcss-color-gray', opts => root => {
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| 44 | // walk all declarations likely containing a gray() function
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| 45 | root.walkDecls(decl => {
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| 46 | if (hasGrayFunction(decl)) {
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| 47 | const originalValue = decl.value; // parse the declaration value
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| 48 |
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| 49 | const ast = parser(originalValue).parse(); // walk every node in the value that contains a gray() function
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| 50 |
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| 51 | ast.walk(node => {
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| 52 | const _getFunctionGrayArgs = getFunctionGrayArgs(node),
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| 53 | _getFunctionGrayArgs2 = _slicedToArray(_getFunctionGrayArgs, 2),
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| 54 | lightness = _getFunctionGrayArgs2[0],
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| 55 | alpha = _getFunctionGrayArgs2[1];
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| 56 |
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| 57 | if (lightness !== undefined) {
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| 58 | // rename the gray() function to rgb()
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| 59 | node.value = 'rgb'; // convert the lab gray lightness into rgb
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| 60 |
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| 61 | const _lab2rgb$map = lab2rgb(lightness, 0, 0).map(channel => Math.max(Math.min(Math.round(channel * 2.55), 255), 0)),
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| 62 | _lab2rgb$map2 = _slicedToArray(_lab2rgb$map, 3),
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| 63 | r = _lab2rgb$map2[0],
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| 64 | g = _lab2rgb$map2[1],
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| 65 | b = _lab2rgb$map2[2]; // preserve the slash nodes within rgb()
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| 66 |
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| 67 |
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| 68 | const openingSlash = node.first;
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| 69 | const closingSlash = node.last;
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| 70 | node.removeAll() // replace the contents of rgb with `(r,g,b`
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| 71 | .append(openingSlash).append(parser.number({
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| 72 | value: r
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| 73 | })).append(parser.comma({
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| 74 | value: ','
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| 75 | })).append(parser.number({
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| 76 | value: g
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| 77 | })).append(parser.comma({
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| 78 | value: ','
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| 79 | })).append(parser.number({
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| 80 | value: b
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| 81 | })); // if an alpha channel was defined
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| 82 |
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| 83 | if (alpha < 1) {
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| 84 | // rename the rgb() function to rgba()
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| 85 | node.value += 'a';
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| 86 | node // append the contents of rgba with `,a`
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| 87 | .append(parser.comma({
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| 88 | value: ','
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| 89 | })).append(parser.number({
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| 90 | value: alpha
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| 91 | }));
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| 92 | } // append the contents of rgb/rgba with `)`
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| 93 |
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| 94 |
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| 95 | node.append(closingSlash);
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| 96 | }
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| 97 | });
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| 98 | const modifiedValue = ast.toString(); // if the modified value has changed from the original value
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| 99 |
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| 100 | if (originalValue !== modifiedValue) {
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| 101 | // if the original gray() color is to be preserved
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| 102 | if (Object(opts).preserve) {
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| 103 | // insert the declaration value with the fallback before the current declaration
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| 104 | decl.cloneBefore({
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| 105 | value: modifiedValue
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| 106 | });
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| 107 | } else {
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| 108 | // otherwise, overwrite the declaration value with the fallback
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| 109 | decl.value = modifiedValue;
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| 110 | }
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| 111 | }
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| 112 | }
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| 113 | });
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| 114 | }); // return whether a string contains a gray() function
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| 115 |
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| 116 | const hasGrayFunctionRegExp = /(^|[^\w-])gray\(/i;
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| 117 |
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| 118 | const hasGrayFunction = decl => hasGrayFunctionRegExp.test(Object(decl).value); // return whether a node matches a specific type
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| 119 |
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| 120 |
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| 121 | const isNumber = node => Object(node).type === 'number';
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| 122 |
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| 123 | const isOperator = node => Object(node).type === 'operator';
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| 124 |
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| 125 | const isFunction = node => Object(node).type === 'func';
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| 126 |
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| 127 | const isCalcRegExp = /^calc$/i;
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| 128 |
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| 129 | const isFunctionCalc = node => isFunction(node) && isCalcRegExp.test(node.value);
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| 130 |
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| 131 | const isGrayRegExp = /^gray$/i;
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| 132 |
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| 133 | const isFunctionGrayWithArgs = node => isFunction(node) && isGrayRegExp.test(node.value) && node.nodes && node.nodes.length;
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| 134 |
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| 135 | const isNumberPercentage = node => isNumber(node) && node.unit === '%';
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| 136 |
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| 137 | const isNumberUnitless = node => isNumber(node) && node.unit === '';
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| 138 |
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| 139 | const isOperatorSlash = node => isOperator(node) && node.value === '/'; // return valid values from a node, otherwise undefined
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| 140 |
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| 141 |
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| 142 | const getNumberUnitless = node => isNumberUnitless(node) ? Number(node.value) : undefined;
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| 143 |
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| 144 | const getOperatorSlash = node => isOperatorSlash(node) ? null : undefined;
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| 145 |
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| 146 | const getAlpha = node => isFunctionCalc(node) ? String(node) : isNumberUnitless(node) ? Number(node.value) : isNumberPercentage(node) ? Number(node.value) / 100 : undefined; // return valid arguments from a gray() function
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| 147 |
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| 148 |
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| 149 | const functionalGrayArgs = [getNumberUnitless, getOperatorSlash, getAlpha];
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| 150 |
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| 151 | const getFunctionGrayArgs = node => {
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| 152 | const validArgs = []; // if the node is a gray() function with arguments
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| 153 |
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| 154 | if (isFunctionGrayWithArgs(node)) {
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| 155 | // get all the gray() function arguments between `(` and `)`
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| 156 | const nodes = node.nodes.slice(1, -1); // validate each argument
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| 157 |
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| 158 | for (const index in nodes) {
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| 159 | const arg = typeof functionalGrayArgs[index] === 'function' ? functionalGrayArgs[index](nodes[index]) : undefined; // if the argument was validated
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| 160 |
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| 161 | if (arg !== undefined) {
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| 162 | // push any non-null argument to the valid arguments array
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| 163 | if (arg !== null) {
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| 164 | validArgs.push(arg);
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| 165 | }
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| 166 | } else {
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| 167 | // otherwise, return an empty array
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| 168 | return [];
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| 169 | }
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| 170 | } // return the valid arguments array
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| 171 |
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| 172 |
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| 173 | return validArgs;
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| 174 | } else {
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| 175 | // otherwise, return an empty array
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| 176 | return [];
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| 177 | }
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| 178 | };
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| 179 |
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| 180 | export default index;
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