assetgraph/lib/assetGraphConditions.js

An auto discovery dependency graph based optimization framework for web pages and applications

const objectLiteralParse = require('./3rdparty/js-object-literal-parse');

const assetGraphConditions = (module.exports = {});

function parseSingleQuotedString(str) {
  return JSON.parse(`"${str.replace(/^'|'$/g, '').replace(/\\?"/g, '\\"')}"`);
}

function parseArrayOfSingleQuotedStrings(str) {
  return str
    .replace(/^\[|\]$/g, '')
    .split(/,\s+/)
    .map(parseSingleQuotedString);
}

function parseValue(str) {
  if (/^\[/.test(str)) {
    return parseArrayOfSingleQuotedStrings(str);
  } else {
    return parseSingleQuotedString(str);
  }
}

assetGraphConditions.parse = node => {
  const assetGraphConditionsAttributeValue =
    node && node.getAttribute('data-assetgraph-conditions');
  if (assetGraphConditionsAttributeValue) {
    const obj = {};
    for (const keyAndValue of objectLiteralParse(
      assetGraphConditionsAttributeValue
    )) {
      obj[keyAndValue[0]] = parseValue(keyAndValue[1]);
    }
    return obj;
  }
};

function singleQuoteString(str) {
  return `'${str.replace(/'/g, "\\'")}'`;
}

assetGraphConditions.stringify = obj => {
  return Object.keys(obj)
    .map(
      key =>
        `${/[^a-z]/.test(key) ? singleQuoteString(key) : key}: ${
          Array.isArray(obj[key])
            ? `[${obj[key].map(singleQuoteString).join(', ')}]`
            : singleQuoteString(obj[key])
        }`
    )
    .join(', ');
};