All files / packages/design-system/scripts/validation/plugins css-analyzer.js

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/**
 * CSS Analyzer Plugin
 * Analyzes CSS property value changes and provides detailed insights
 */
 
/**
 * Parse CSS properties from content
 * @param {string} css - CSS content
 * @returns {Map<string, Set<string>>} Map of property names to values
 */
function parseCSSProperties(css) {
  const properties = new Map();
 
  // Simple regex to find property: value pairs
  const propertyRegex = /([a-z-]+)\s*:\s*([^;{}]+)/gi;
  let match;
 
  while ((match = propertyRegex.exec(css)) !== null) {
    const [, prop, value] = match;
    const normalizedProp = prop.toLowerCase().trim();
    const normalizedValue = value.trim();
 
    if (!properties.has(normalizedProp)) {
      properties.set(normalizedProp, new Set());
    }
    properties.get(normalizedProp).add(normalizedValue);
  }
 
  return properties;
}
 
/**
 * Analyze property value changes between baseline and current
 * @param {string} baseline - Baseline CSS content
 * @param {string} current - Current CSS content
 * @returns {Object} Analysis results
 */
export function analyzePropertyValueChanges(baseline, current) {
  const baselineProps = parseCSSProperties(baseline);
  const currentProps = parseCSSProperties(current);
 
  const addedProperties = [];
  const removedProperties = [];
  const changedProperties = [];
 
  // Find removed properties
  for (const [prop, values] of baselineProps) {
    if (!currentProps.has(prop)) {
      removedProperties.push({
        property: prop,
        values: Array.from(values),
      });
    }
  }
 
  // Find added and changed properties
  for (const [prop, values] of currentProps) {
    if (!baselineProps.has(prop)) {
      addedProperties.push({
        property: prop,
        values: Array.from(values),
      });
    } else {
      const baselineValues = baselineProps.get(prop);
      const added = Array.from(values).filter((v) => !baselineValues.has(v));
      const removed = Array.from(baselineValues).filter((v) => !values.has(v));
 
      if (added.length > 0 || removed.length > 0) {
        changedProperties.push({
          property: prop,
          addedValues: added,
          removedValues: removed,
        });
      }
    }
  }
 
  return {
    addedProperties,
    removedProperties,
    changedProperties,
  };
}
 
/**
 * Plugin hook: afterCompare
 * Adds CSS analysis data to comparison results
 * @param {Object} result - Comparison result
 * @param {string} relativePath - Relative file path
 * @returns {Object} Enhanced result
 */
export function afterCompare(result, relativePath) {
  // Only analyze CSS files with differences
  if (!relativePath.endsWith('.css') || result.status === 'identical') {
    return result;
  }
 
  const { baselineContent, currentContent } = result;
 
  Eif (result.status === 'different' && baselineContent && currentContent) {
    const analysis = analyzePropertyValueChanges(baselineContent, currentContent);
 
    result.pluginData = {
      ...result.pluginData,
      cssAnalysis: analysis,
    };
  }
 
  return result;
}
 
export default {
  name: 'css-analyzer',
  afterCompare,
};