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Viewing file:     index.js (3.6 KB)      -rw-r--r--

'use strict';

const postcss = require('postcss');
const ICSSReplaceSymbols = require('icss-replace-symbols');
const replaceSymbols = require('icss-replace-symbols');

const matchImports = /^(.+?|\([\s\S]+?\))\s+from\s+("[^"]*"|'[^']*'|[\w-]+)$/;
const matchValueDefinition = /(?:\s+|^)([\w-]+):?\s+(.+?)\s*$/g;
const matchImport = /^([\w-]+)(?:\s+as\s+([\w-]+))?/;

let options = {};
let importIndex = 0;
let createImportedName =
  (options && options.createImportedName) ||
  ((importName /*, path*/) =>
    `i__const_${importName.replace(/\W/g, '_')}_${importIndex++}`);

module.exports = postcss.plugin(
  'postcss-modules-values',
  () => (css, result) => {
    const importAliases = [];
    const definitions = {};

    const addDefinition = atRule => {
      let matches;
      while ((matches = matchValueDefinition.exec(atRule.params))) {
        let [, /*match*/ key, value] = matches;
        // Add to the definitions, knowing that values can refer to each other
        definitions[key] = replaceSymbols.replaceAll(definitions, value);
        atRule.remove();
      }
    };

    const addImport = atRule => {
      const matches = matchImports.exec(atRule.params);
      if (matches) {
        let [, /*match*/ aliases, path] = matches;
        // We can use constants for path names
        if (definitions[path]) {
          path = definitions[path];
        }
        const imports = aliases
          .replace(/^\(\s*([\s\S]+)\s*\)$/, '$1')
          .split(/\s*,\s*/)
          .map(alias => {
            const tokens = matchImport.exec(alias);
            if (tokens) {
              const [, /*match*/ theirName, myName = theirName] = tokens;
              const importedName = createImportedName(myName);
              definitions[myName] = importedName;
              return { theirName, importedName };
            } else {
              throw new Error(`@import statement "${alias}" is invalid!`);
            }
          });
        importAliases.push({ path, imports });
        atRule.remove();
      }
    };

    /* Look at all the @value statements and treat them as locals or as imports */
    css.walkAtRules('value', atRule => {
      if (matchImports.exec(atRule.params)) {
        addImport(atRule);
      } else {
        if (atRule.params.indexOf('@value') !== -1) {
          result.warn('Invalid value definition: ' + atRule.params);
        }

        addDefinition(atRule);
      }
    });

    /* 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 */
    const exportDeclarations = Object.keys(definitions).map(key =>
      postcss.decl({
        value: definitions[key],
        prop: key,
        raws: { before: '\n  ' }
      })
    );

    /* If we have no definitions, don't continue */
    if (!Object.keys(definitions).length) {
      return;
    }

    /* Perform replacements */
    ICSSReplaceSymbols.default(css, definitions);

    /* Add export rules if any */
    if (exportDeclarations.length > 0) {
      const exportRule = postcss.rule({
        selector: ':export',
        raws: { after: '\n' }
      });
      exportRule.append(exportDeclarations);
      css.prepend(exportRule);
    }

    /* Add import rules */
    importAliases.reverse().forEach(({ path, imports }) => {
      const importRule = postcss.rule({
        selector: `:import(${path})`,
        raws: { after: '\n' }
      });
      imports.forEach(({ theirName, importedName }) => {
        importRule.append({
          value: theirName,
          prop: importedName,
          raws: { before: '\n  ' }
        });
      });

      css.prepend(importRule);
    });
  }
);