149 lines
3.9 KiB
JavaScript
149 lines
3.9 KiB
JavaScript
'use strict';
|
|
|
|
Object.defineProperty(exports, "__esModule", {
|
|
value: true
|
|
});
|
|
|
|
var _postcss = require('postcss');
|
|
|
|
var _postcssValueParser = require('postcss-value-parser');
|
|
|
|
var _postcssValueParser2 = _interopRequireDefault(_postcssValueParser);
|
|
|
|
var _cssnanoUtilGetArguments = require('cssnano-util-get-arguments');
|
|
|
|
var _cssnanoUtilGetArguments2 = _interopRequireDefault(_cssnanoUtilGetArguments);
|
|
|
|
var _has = require('has');
|
|
|
|
var _has2 = _interopRequireDefault(_has);
|
|
|
|
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
|
|
|
|
const directions = ['top', 'right', 'bottom', 'left', 'center'];
|
|
|
|
const center = '50%';
|
|
|
|
const horizontal = {
|
|
right: '100%',
|
|
left: '0'
|
|
};
|
|
|
|
const vertical = {
|
|
bottom: '100%',
|
|
top: '0'
|
|
};
|
|
|
|
function transform(value) {
|
|
const parsed = (0, _postcssValueParser2.default)(value);
|
|
const args = (0, _cssnanoUtilGetArguments2.default)(parsed);
|
|
const relevant = [];
|
|
|
|
args.forEach(arg => {
|
|
relevant.push({
|
|
start: null,
|
|
end: null
|
|
});
|
|
|
|
arg.forEach((part, index) => {
|
|
const isPosition = ~directions.indexOf(part.value.toLowerCase()) || (0, _postcssValueParser.unit)(part.value);
|
|
const len = relevant.length - 1;
|
|
|
|
if (relevant[len].start === null && isPosition) {
|
|
relevant[len].start = index;
|
|
relevant[len].end = index;
|
|
|
|
return;
|
|
}
|
|
|
|
if (relevant[len].start !== null) {
|
|
if (part.type === 'space') {
|
|
return;
|
|
} else if (isPosition) {
|
|
relevant[len].end = index;
|
|
|
|
return;
|
|
}
|
|
|
|
return;
|
|
}
|
|
});
|
|
});
|
|
|
|
relevant.forEach((range, index) => {
|
|
if (range.start === null) {
|
|
return;
|
|
}
|
|
|
|
const position = args[index].slice(range.start, range.end + 1);
|
|
|
|
if (position.length > 3) {
|
|
return;
|
|
}
|
|
|
|
const firstValue = position[0].value.toLowerCase();
|
|
const secondValue = position[2] && position[2].value ? position[2].value.toLowerCase() : null;
|
|
|
|
if (position.length === 1 || secondValue === 'center') {
|
|
if (secondValue) {
|
|
position[2].value = position[1].value = '';
|
|
}
|
|
|
|
const map = Object.assign({}, horizontal, {
|
|
center
|
|
});
|
|
|
|
if ((0, _has2.default)(map, firstValue)) {
|
|
position[0].value = map[firstValue];
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
if (firstValue === 'center' && ~directions.indexOf(secondValue)) {
|
|
position[0].value = position[1].value = '';
|
|
|
|
if ((0, _has2.default)(horizontal, secondValue)) {
|
|
position[2].value = horizontal[secondValue];
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
if ((0, _has2.default)(horizontal, firstValue) && (0, _has2.default)(vertical, secondValue)) {
|
|
position[0].value = horizontal[firstValue];
|
|
position[2].value = vertical[secondValue];
|
|
|
|
return;
|
|
} else if ((0, _has2.default)(vertical, firstValue) && (0, _has2.default)(horizontal, secondValue)) {
|
|
position[0].value = horizontal[secondValue];
|
|
position[2].value = vertical[firstValue];
|
|
|
|
return;
|
|
}
|
|
});
|
|
|
|
return parsed.toString();
|
|
}
|
|
|
|
exports.default = (0, _postcss.plugin)('postcss-normalize-positions', () => {
|
|
return css => {
|
|
const cache = {};
|
|
|
|
css.walkDecls(/^(background(-position)?|(-webkit-)?perspective-origin)$/i, decl => {
|
|
const value = decl.value;
|
|
|
|
if (cache[value]) {
|
|
decl.value = cache[value];
|
|
|
|
return;
|
|
}
|
|
|
|
const result = transform(value);
|
|
|
|
decl.value = result;
|
|
cache[value] = result;
|
|
});
|
|
};
|
|
});
|
|
module.exports = exports['default']; |