index.js
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'use strict';
const CommentRemover = require('./lib/commentRemover');
const commentParser = require('./lib/commentParser');
/** @typedef {object} Options
* @property {boolean=} removeAll
* @property {boolean=} removeAllButFirst
* @property {(s: string) => boolean=} remove
*/
/**
* @type {import('postcss').PluginCreator<Options>}
* @param {Options} opts
* @return {import('postcss').Plugin}
*/
function pluginCreator(opts = {}) {
const remover = new CommentRemover(opts);
const matcherCache = new Map();
const replacerCache = new Map();
/**
* @param {string} source
* @return {[number, number, number][]}
*/
function matchesComments(source) {
if (matcherCache.has(source)) {
return matcherCache.get(source);
}
const result = commentParser(source).filter(([type]) => type);
matcherCache.set(source, result);
return result;
}
/**
* @param {string} source
* @param {(s: string) => string[]} space
* @return {string}
*/
function replaceComments(source, space, separator = ' ') {
const key = source + '@|@' + separator;
if (replacerCache.has(key)) {
return replacerCache.get(key);
}
const parsed = commentParser(source).reduce((value, [type, start, end]) => {
const contents = source.slice(start, end);
if (!type) {
return value + contents;
}
if (remover.canRemove(contents)) {
return value + separator;
}
return `${value}/*${contents}*/`;
}, '');
const result = space(parsed).join(' ');
replacerCache.set(key, result);
return result;
}
return {
postcssPlugin: 'postcss-discard-comments',
OnceExit(css, { list }) {
css.walk((node) => {
if (node.type === 'comment' && remover.canRemove(node.text)) {
node.remove();
return;
}
if (typeof node.raws.between === 'string') {
node.raws.between = replaceComments(node.raws.between, list.space);
}
if (node.type === 'decl') {
if (node.raws.value && node.raws.value.raw) {
if (node.raws.value.value === node.value) {
node.value = replaceComments(node.raws.value.raw, list.space);
} else {
node.value = replaceComments(node.value, list.space);
}
/** @type {null | {value: string, raw: string}} */ (
node.raws.value
) = null;
}
if (node.raws.important) {
node.raws.important = replaceComments(
node.raws.important,
list.space
);
const b = matchesComments(node.raws.important);
node.raws.important = b.length ? node.raws.important : '!important';
} else {
node.value = replaceComments(node.value, list.space);
}
return;
}
if (
node.type === 'rule' &&
node.raws.selector &&
node.raws.selector.raw
) {
node.raws.selector.raw = replaceComments(
node.raws.selector.raw,
list.space,
''
);
return;
}
if (node.type === 'atrule') {
if (node.raws.afterName) {
const commentsReplaced = replaceComments(
node.raws.afterName,
list.space
);
if (!commentsReplaced.length) {
node.raws.afterName = commentsReplaced + ' ';
} else {
node.raws.afterName = ' ' + commentsReplaced + ' ';
}
}
if (node.raws.params && node.raws.params.raw) {
node.raws.params.raw = replaceComments(
node.raws.params.raw,
list.space
);
}
}
});
},
};
}
pluginCreator.postcss = true;
module.exports = pluginCreator;