143 lines
4.2 KiB
JavaScript
Executable file
143 lines
4.2 KiB
JavaScript
Executable file
"use strict";
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const ICSSUtils = require("icss-utils");
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const matchImports = /^(.+?|\([\s\S]+?\))\s+from\s+("[^"]*"|'[^']*'|[\w-]+)$/;
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const matchValueDefinition = /(?:\s+|^)([\w-]+):?(.*?)$/;
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const matchImport = /^([\w-]+)(?:\s+as\s+([\w-]+))?/;
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module.exports = (options) => {
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let importIndex = 0;
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const 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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return {
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postcssPlugin: "postcss-modules-values",
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prepare(result) {
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const importAliases = [];
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const definitions = {};
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return {
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Once(root, postcss) {
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root.walkAtRules(/value/i, (atRule) => {
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const matches = atRule.params.match(matchImports);
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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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return;
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}
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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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let [, key, value] = `${atRule.params}${atRule.raws.between}`.match(
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matchValueDefinition
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);
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const normalizedValue = value.replace(/\/\*((?!\*\/).*?)\*\//g, "");
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if (normalizedValue.length === 0) {
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result.warn("Invalid value definition: " + atRule.params);
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atRule.remove();
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return;
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}
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let isOnlySpace = /^\s+$/.test(normalizedValue);
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if (!isOnlySpace) {
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value = value.trim();
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}
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// Add to the definitions, knowing that values can refer to each other
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definitions[key] = ICSSUtils.replaceValueSymbols(
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value,
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definitions
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);
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atRule.remove();
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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(root, definitions);
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/* We want to export anything defined by now, but don't add it to the CSS yet or 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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/* 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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root.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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root.prepend(importRule);
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});
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},
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};
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},
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};
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};
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module.exports.postcss = true;
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