mirror of
https://github.com/Sevichecc/Urara-Blog.git
synced 2025-05-06 01:59:13 +08:00
93 lines
2.3 KiB
Text
93 lines
2.3 KiB
Text
'use strict';
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const order = {
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'*': 0,
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'/': 0,
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'+': 1,
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'-': 1,
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};
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/**
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* @param {number} value
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* @param {number | false} prec
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*/
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function round(value, prec) {
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if (prec !== false) {
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const precision = Math.pow(10, prec);
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return Math.round(value * precision) / precision;
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}
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return value;
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}
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/**
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* @param {number | false} prec
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* @param {import('../parser').CalcNode} node
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*
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* @return {string}
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*/
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function stringify(node, prec) {
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switch (node.type) {
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case 'MathExpression': {
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const { left, right, operator: op } = node;
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let str = '';
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if (left.type === 'MathExpression' && order[op] < order[left.operator]) {
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str += `(${stringify(left, prec)})`;
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} else {
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str += stringify(left, prec);
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}
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str += order[op] ? ` ${node.operator} ` : node.operator;
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if (
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right.type === 'MathExpression' &&
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order[op] < order[right.operator]
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) {
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str += `(${stringify(right, prec)})`;
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} else {
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str += stringify(right, prec);
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}
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return str;
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}
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case 'Number':
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return round(node.value, prec).toString();
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case 'Function':
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return node.value.toString();
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case 'ParenthesizedExpression':
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return `(${stringify(node.content, prec)})`;
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default:
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return round(node.value, prec) + node.unit;
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}
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}
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/**
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* @param {string} calc
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* @param {import('../parser').CalcNode} node
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* @param {string} originalValue
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* @param {{precision: number | false, warnWhenCannotResolve: boolean}} options
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* @param {import("postcss").Result} result
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* @param {import("postcss").ChildNode} item
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*
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* @returns {string}
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*/
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module.exports = function (calc, node, originalValue, options, result, item) {
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let str = stringify(node, options.precision);
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const shouldPrintCalc =
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node.type === 'MathExpression' || node.type === 'Function';
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if (shouldPrintCalc) {
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// if calc expression couldn't be resolved to a single value, re-wrap it as
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// a calc()
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str = `${calc}(${str})`;
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// if the warnWhenCannotResolve option is on, inform the user that the calc
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// expression could not be resolved to a single value
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if (options.warnWhenCannotResolve) {
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result.warn('Could not reduce expression: ' + originalValue, {
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plugin: 'postcss-calc',
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node: item,
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});
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}
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}
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return str;
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};
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