mirror of
https://github.com/Sevichecc/Urara-Blog.git
synced 2025-05-20 17:59:12 +08:00
319 lines
7.2 KiB
Text
319 lines
7.2 KiB
Text
'use strict';
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const valueParser = require('postcss-value-parser');
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/*
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* Constants (parser usage)
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*/
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const SINGLE_QUOTE = "'".charCodeAt(0);
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const DOUBLE_QUOTE = '"'.charCodeAt(0);
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const BACKSLASH = '\\'.charCodeAt(0);
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const NEWLINE = '\n'.charCodeAt(0);
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const SPACE = ' '.charCodeAt(0);
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const FEED = '\f'.charCodeAt(0);
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const TAB = '\t'.charCodeAt(0);
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const CR = '\r'.charCodeAt(0);
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const WORD_END = /[ \n\t\r\f'"\\]/g;
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/*
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* Constants (node type strings)
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*/
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const C_STRING = 'string';
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const C_ESCAPED_SINGLE_QUOTE = 'escapedSingleQuote';
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const C_ESCAPED_DOUBLE_QUOTE = 'escapedDoubleQuote';
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const C_SINGLE_QUOTE = 'singleQuote';
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const C_DOUBLE_QUOTE = 'doubleQuote';
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const C_NEWLINE = 'newline';
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const C_SINGLE = 'single';
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/*
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* Literals
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*/
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const L_SINGLE_QUOTE = `'`;
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const L_DOUBLE_QUOTE = `"`;
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const L_NEWLINE = `\\\n`;
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/*
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* Parser nodes
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*/
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const T_ESCAPED_SINGLE_QUOTE = { type: C_ESCAPED_SINGLE_QUOTE, value: `\\'` };
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const T_ESCAPED_DOUBLE_QUOTE = { type: C_ESCAPED_DOUBLE_QUOTE, value: `\\"` };
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const T_SINGLE_QUOTE = { type: C_SINGLE_QUOTE, value: L_SINGLE_QUOTE };
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const T_DOUBLE_QUOTE = { type: C_DOUBLE_QUOTE, value: L_DOUBLE_QUOTE };
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const T_NEWLINE = { type: C_NEWLINE, value: L_NEWLINE };
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/** @typedef {T_ESCAPED_SINGLE_QUOTE | T_ESCAPED_DOUBLE_QUOTE | T_SINGLE_QUOTE | T_NEWLINE} StringAstNode */
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/**
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* @typedef {{nodes: StringAstNode[],
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* types: {escapedSingleQuote: number, escapedDoubleQuote: number, singleQuote: number, doubleQuote: number},
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* quotes: boolean}} StringAst
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*/
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/**
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* @param {StringAst} ast
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* @return {string}
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*/
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function stringify(ast) {
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return ast.nodes.reduce((str, { value }) => {
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// Collapse multiple line strings automatically
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if (value === L_NEWLINE) {
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return str;
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}
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return str + value;
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}, '');
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}
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/**
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* @param {string} str
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* @return {StringAst}
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*/
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function parse(str) {
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let code, next, value;
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let pos = 0;
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let len = str.length;
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/** @type StringAst */
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const ast = {
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nodes: [],
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types: {
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escapedSingleQuote: 0,
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escapedDoubleQuote: 0,
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singleQuote: 0,
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doubleQuote: 0,
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},
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quotes: false,
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};
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while (pos < len) {
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code = str.charCodeAt(pos);
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switch (code) {
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case SPACE:
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case TAB:
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case CR:
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case FEED:
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next = pos;
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do {
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next += 1;
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code = str.charCodeAt(next);
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} while (
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code === SPACE ||
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code === NEWLINE ||
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code === TAB ||
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code === CR ||
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code === FEED
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);
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ast.nodes.push({
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type: 'space',
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value: str.slice(pos, next),
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});
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pos = next - 1;
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break;
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case SINGLE_QUOTE:
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ast.nodes.push(T_SINGLE_QUOTE);
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ast.types[C_SINGLE_QUOTE]++;
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ast.quotes = true;
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break;
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case DOUBLE_QUOTE:
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ast.nodes.push(T_DOUBLE_QUOTE);
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ast.types[C_DOUBLE_QUOTE]++;
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ast.quotes = true;
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break;
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case BACKSLASH:
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next = pos + 1;
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if (str.charCodeAt(next) === SINGLE_QUOTE) {
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ast.nodes.push(T_ESCAPED_SINGLE_QUOTE);
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ast.types[C_ESCAPED_SINGLE_QUOTE]++;
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ast.quotes = true;
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pos = next;
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break;
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} else if (str.charCodeAt(next) === DOUBLE_QUOTE) {
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ast.nodes.push(T_ESCAPED_DOUBLE_QUOTE);
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ast.types[C_ESCAPED_DOUBLE_QUOTE]++;
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ast.quotes = true;
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pos = next;
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break;
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} else if (str.charCodeAt(next) === NEWLINE) {
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ast.nodes.push(T_NEWLINE);
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pos = next;
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break;
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}
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/*
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* We need to fall through here to handle the token as
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* a whole word. The missing 'break' is intentional.
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*/
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default:
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WORD_END.lastIndex = pos + 1;
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WORD_END.test(str);
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if (WORD_END.lastIndex === 0) {
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next = len - 1;
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} else {
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next = WORD_END.lastIndex - 2;
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}
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value = str.slice(pos, next + 1);
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ast.nodes.push({
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type: C_STRING,
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value,
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});
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pos = next;
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}
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pos++;
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}
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return ast;
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}
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/**
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* @param {valueParser.StringNode} node
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* @param {StringAst} ast
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* @return {void}
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*/
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function changeWrappingQuotes(node, ast) {
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const { types } = ast;
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if (types[C_SINGLE_QUOTE] || types[C_DOUBLE_QUOTE]) {
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return;
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}
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if (
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node.quote === L_SINGLE_QUOTE &&
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types[C_ESCAPED_SINGLE_QUOTE] > 0 &&
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!types[C_ESCAPED_DOUBLE_QUOTE]
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) {
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node.quote = L_DOUBLE_QUOTE;
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}
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if (
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node.quote === L_DOUBLE_QUOTE &&
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types[C_ESCAPED_DOUBLE_QUOTE] > 0 &&
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!types[C_ESCAPED_SINGLE_QUOTE]
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) {
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node.quote = L_SINGLE_QUOTE;
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}
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ast.nodes = changeChildQuotes(ast.nodes, node.quote);
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}
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/**
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* @param {StringAstNode[]} childNodes
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* @param {string} parentQuote
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* @return {StringAstNode[]}
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*/
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function changeChildQuotes(childNodes, parentQuote) {
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const updatedChildren = [];
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for (const child of childNodes) {
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if (
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child.type === C_ESCAPED_DOUBLE_QUOTE &&
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parentQuote === L_SINGLE_QUOTE
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) {
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updatedChildren.push(T_DOUBLE_QUOTE);
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} else if (
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child.type === C_ESCAPED_SINGLE_QUOTE &&
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parentQuote === L_DOUBLE_QUOTE
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) {
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updatedChildren.push(T_SINGLE_QUOTE);
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} else {
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updatedChildren.push(child);
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}
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}
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return updatedChildren;
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}
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/**
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* @param {string} value
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* @param {'single' | 'double'} preferredQuote
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* @return {string}
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*/
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function normalize(value, preferredQuote) {
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if (!value || !value.length) {
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return value;
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}
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return valueParser(value)
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.walk((child) => {
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if (child.type !== C_STRING) {
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return;
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}
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const ast = parse(child.value);
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if (ast.quotes) {
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changeWrappingQuotes(child, ast);
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} else if (preferredQuote === C_SINGLE) {
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child.quote = L_SINGLE_QUOTE;
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} else {
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child.quote = L_DOUBLE_QUOTE;
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}
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child.value = stringify(ast);
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})
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.toString();
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}
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/**
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* @param {string} original
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* @param {Map<string, string>} cache
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* @param {'single' | 'double'} preferredQuote
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* @return {string}
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*/
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function minify(original, cache, preferredQuote) {
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const key = original + '|' + preferredQuote;
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if (cache.has(key)) {
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return /** @type {string} */ (cache.get(key));
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}
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const newValue = normalize(original, preferredQuote);
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cache.set(key, newValue);
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return newValue;
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}
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/** @typedef {{preferredQuote?: 'double' | 'single'}} Options */
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/**
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* @type {import('postcss').PluginCreator<Options>}
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* @param {Options} opts
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* @return {import('postcss').Plugin}
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*/
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function pluginCreator(opts) {
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const { preferredQuote } = Object.assign(
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{},
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{
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preferredQuote: 'double',
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},
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opts
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);
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return {
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postcssPlugin: 'postcss-normalize-string',
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OnceExit(css) {
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const cache = new Map();
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css.walk((node) => {
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switch (node.type) {
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case 'rule':
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node.selector = minify(node.selector, cache, preferredQuote);
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break;
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case 'decl':
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node.value = minify(node.value, cache, preferredQuote);
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break;
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case 'atrule':
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node.params = minify(node.params, cache, preferredQuote);
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break;
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}
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});
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},
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};
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}
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pluginCreator.postcss = true;
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module.exports = pluginCreator;
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