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'use strict';
const dynamicRequire = require('./dynamicRequire');
const fs = require('fs');
const LazyResult = require('postcss/lib/lazy-result');
const postcss = require('postcss');
/** @type {import('postcss-syntax')} */
let autoSyntax = null;
/** @typedef {import('stylelint').StylelintInternalApi} StylelintInternalApi */
/** @typedef {{parse: any, stringify: any}} Syntax */
const postcssProcessor = postcss();
/**
* @param {StylelintInternalApi} stylelint
* @param {import('stylelint').GetPostcssOptions} options
*
* @returns {Promise<import('postcss').Result>}
*/
module.exports = function(stylelint, options = {}) {
const cached = options.filePath ? stylelint._postcssResultCache.get(options.filePath) : undefined;
if (cached) return Promise.resolve(cached);
/** @type {Promise<string> | undefined} */
let getCode;
if (options.code !== undefined) {
getCode = Promise.resolve(options.code);
} else if (options.filePath) {
getCode = readFile(options.filePath);
}
if (!getCode) {
throw new Error('code or filePath required');
}
return getCode
.then((code) => {
const customSyntax = stylelint._options.customSyntax;
/** @type {Syntax | null} */
let syntax = null;
if (customSyntax) {
try {
// TODO TYPES determine which type has customSyntax
const useCustomSyntax = /** @type {any} */ dynamicRequire(customSyntax);
/*
* PostCSS allows for syntaxes that only contain a parser, however,
* it then expects the syntax to be set as the `parser` option rather than `syntax`.
*/
if (!useCustomSyntax.parse) {
syntax = {
parse: useCustomSyntax,
stringify: postcss.stringify,
};
} else {
syntax = useCustomSyntax;
}
} catch (e) {
throw new Error(`Cannot resolve custom syntax module ${customSyntax}`);
}
} else if (stylelint._options.syntax === 'css') {
syntax = cssSyntax(stylelint);
} else if (stylelint._options.syntax) {
/** @type {{[k: string]: string}} */
const syntaxes = {
'css-in-js': 'postcss-jsx',
html: 'postcss-html',
less: 'postcss-less',
markdown: 'postcss-markdown',
sass: 'postcss-sass',
scss: 'postcss-scss',
sugarss: 'sugarss',
};
const syntaxFromOptions = syntaxes[stylelint._options.syntax];
if (!syntaxFromOptions) {
throw new Error(
'You must use a valid syntax option, either: css, css-in-js, html, less, markdown, sass, scss, or sugarss',
);
}
syntax = dynamicRequire(syntaxFromOptions);
} else if (
!(options.codeProcessors && options.codeProcessors.length) ||
(options.filePath && /\.(scss|sass|less)$/.test(options.filePath))
) {
if (!autoSyntax) {
autoSyntax = require('postcss-syntax');
}
syntax = autoSyntax({
css: cssSyntax(stylelint),
});
}
const postcssOptions = {
from: options.filePath,
syntax,
};
const source = options.code ? options.codeFilename : options.filePath;
let preProcessedCode = code;
if (options.codeProcessors && options.codeProcessors.length) {
if (stylelint._options.fix) {
// eslint-disable-next-line no-console
console.warn(
'Autofix is incompatible with processors and will be disabled. Are you sure you need a processor?',
);
stylelint._options.fix = false;
}
options.codeProcessors.forEach((codeProcessor) => {
preProcessedCode = codeProcessor(preProcessedCode, source);
});
}
const result = new LazyResult(postcssProcessor, preProcessedCode, postcssOptions);
return result;
})
.then((postcssResult) => {
if (options.filePath) {
stylelint._postcssResultCache.set(options.filePath, postcssResult);
}
return postcssResult;
});
};
/**
* @param {string} filePath
* @returns {Promise<string>}
*/
function readFile(filePath) {
return new Promise((resolve, reject) => {
fs.readFile(filePath, 'utf8', (err, content) => {
if (err) {
return reject(err);
}
resolve(content);
});
});
}
/**
* @param {StylelintInternalApi} stylelint
* @returns {Syntax}
*/
function cssSyntax(stylelint) {
return {
parse: stylelint._options.fix ? dynamicRequire('postcss-safe-parser') : postcss.parse,
stringify: postcss.stringify,
};
}
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