'use strict';
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const postcss = require('postcss');
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const ICSSUtils = require('icss-utils');
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const matchImports = /^(.+?|\([\s\S]+?\))\s+from\s+("[^"]*"|'[^']*'|[\w-]+)$/;
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const matchValueDefinition = /(?:\s+|^)([\w-]+):?\s+(.+?)\s*$/g;
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const matchImport = /^([\w-]+)(?:\s+as\s+([\w-]+))?/;
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let options = {};
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let importIndex = 0;
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let createImportedName =
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(options && options.createImportedName) ||
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((importName /*, path*/) =>
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`i__const_${importName.replace(/\W/g, '_')}_${importIndex++}`);
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module.exports = postcss.plugin(
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'postcss-modules-values',
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() => (css, result) => {
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const importAliases = [];
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const definitions = {};
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const addDefinition = atRule => {
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let matches;
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while ((matches = matchValueDefinition.exec(atRule.params))) {
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let [, /*match*/ key, value] = matches;
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// Add to the definitions, knowing that values can refer to each other
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definitions[key] = ICSSUtils.replaceValueSymbols(value, definitions);
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atRule.remove();
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}
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};
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const addImport = atRule => {
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const matches = matchImports.exec(atRule.params);
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if (matches) {
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let [, /*match*/ aliases, path] = matches;
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// We can use constants for path names
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if (definitions[path]) {
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path = definitions[path];
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}
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const imports = aliases
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.replace(/^\(\s*([\s\S]+)\s*\)$/, '$1')
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.split(/\s*,\s*/)
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.map(alias => {
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const tokens = matchImport.exec(alias);
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if (tokens) {
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const [, /*match*/ theirName, myName = theirName] = tokens;
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const importedName = createImportedName(myName);
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definitions[myName] = importedName;
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return { theirName, importedName };
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} else {
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throw new Error(`@import statement "${alias}" is invalid!`);
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}
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});
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importAliases.push({ path, imports });
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atRule.remove();
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}
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};
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/* Look at all the @value statements and treat them as locals or as imports */
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css.walkAtRules('value', atRule => {
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if (matchImports.exec(atRule.params)) {
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addImport(atRule);
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} else {
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if (atRule.params.indexOf('@value') !== -1) {
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result.warn('Invalid value definition: ' + atRule.params);
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}
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addDefinition(atRule);
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}
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});
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/* We want to export anything defined by now, but don't add it to the CSS yet or
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it well get picked up by the replacement stuff */
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const exportDeclarations = Object.keys(definitions).map(key =>
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postcss.decl({
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value: definitions[key],
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prop: key,
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raws: { before: '\n ' }
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})
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);
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/* If we have no definitions, don't continue */
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if (!Object.keys(definitions).length) {
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return;
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}
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/* Perform replacements */
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ICSSUtils.replaceSymbols(css, definitions);
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/* Add export rules if any */
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if (exportDeclarations.length > 0) {
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const exportRule = postcss.rule({
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selector: ':export',
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raws: { after: '\n' }
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});
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exportRule.append(exportDeclarations);
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css.prepend(exportRule);
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}
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/* Add import rules */
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importAliases.reverse().forEach(({ path, imports }) => {
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const importRule = postcss.rule({
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selector: `:import(${path})`,
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raws: { after: '\n' }
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});
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imports.forEach(({ theirName, importedName }) => {
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importRule.append({
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value: theirName,
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prop: importedName,
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raws: { before: '\n ' }
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});
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});
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css.prepend(importRule);
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});
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}
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);
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