All files / packages/design-tokens/src/validators/cross-platform-colors ios-parser.js

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/**
 * Parser for iOS (Swift) color token files.
 * Handles direct Color(red:green:blue:) float values, palette token class naming,
 * and reference assignments between token enums/classes.
 */
 
import {
  classNameToMode,
  resolvePaletteTokenName,
  storeDirectToken,
  resolveReferences,
} from './mobile-parser-utils.js';
 
const SWIFT_PALETTE_CLASS_RE = /Cosmos(.+?)Palette/;
const SWIFT_CLASS_RE = /(?:class|enum)\s+(\w+)/;
const SWIFT_STATIC_VAR_RE = /static\s+(?:let|var)\s+(\w+)(?:\s*:\s*Color)?/;
const SWIFT_RED_RE = /red:\s*([\d.]+)/;
const SWIFT_GREEN_RE = /green:\s*([\d.]+)/;
const SWIFT_BLUE_RE = /blue:\s*([\d.]+)/;
const SWIFT_REF_RE = /static\s+var\s+(\w+)\s*:\s*Color\s*\{\s*\w+\.(\w+)\s*\}/;
 
/**
 * Convert camelCase or PascalCase to kebab-case.
 * Handles boundaries before uppercase letters and before digits.
 */
function toKebab(s) {
  return s
    .replaceAll(/([a-z])([A-Z])/g, '$1-$2')
    .replaceAll(/([a-z])(\d)/g, '$1-$2')
    .replaceAll(/([A-Z])(\d)/g, '$1-$2')
    .toLowerCase();
}
 
/**
 * Convert an iOS Swift token name to the canonical CSS token name format.
 * Swift uses camelCase names (e.g. 'errorBase10', 'paletteNeutral0')
 * while CSS uses kebab-case with a 'color-' prefix.
 * @param {string} tokenName
 * @returns {string}
 */
export function normalizeSwiftTokenName(tokenName) {
  if (tokenName.startsWith('palette')) {
    return 'color-palette-' + toKebab(tokenName.replace(/^palette/, ''));
  }
  return 'color-' + toKebab(tokenName);
}
 
/**
 * Parse a Swift direct Color(red:green:blue:) line into a typed result object.
 * Converts 0–1 float RGB components to a 6-char hex string.
 * @param {string} trimmed
 * @param {string|null} currentClass
 * @param {string|null} currentMode
 * @returns {{ type: 'direct', fullTokenName: string, hex: string, mode: string|null } | null}
 */
function parseSwiftDirectColor(trimmed, currentClass, currentMode) {
  const varMatch = SWIFT_STATIC_VAR_RE.exec(trimmed);
  Iif (!varMatch) return null;
 
  const redMatch = SWIFT_RED_RE.exec(trimmed);
  const greenMatch = SWIFT_GREEN_RE.exec(trimmed);
  const blueMatch = SWIFT_BLUE_RE.exec(trimmed);
  Iif (!redMatch || !greenMatch || !blueMatch) return null;
 
  const hex = [redMatch[1], greenMatch[1], blueMatch[1]]
    .map((v) =>
      Math.round(Number.parseFloat(v) * 255)
        .toString(16)
        .padStart(2, '0'),
    )
    .join('');
 
  const fullTokenName = resolvePaletteTokenName(varMatch[1], currentClass, SWIFT_PALETTE_CLASS_RE);
  return { type: 'direct', fullTokenName, hex, mode: currentMode };
}
 
/**
 * Parse a single Swift source line into a typed result object.
 * Returns null for lines that don't match any known pattern.
 * @param {string} trimmed
 * @param {string|null} currentClass
 * @param {string|null} currentMode
 * @returns {{ type: 'class', className: string, mode: string|null }
 *          | { type: 'direct', fullTokenName: string, hex: string, mode: string|null }
 *          | { type: 'ref', tokenName: string, refProperty: string, mode: string|null }
 *          | null}
 */
function parseSwiftLine(trimmed, currentClass, currentMode) {
  if (
    (trimmed.includes('public class') || trimmed.includes('public enum')) &&
    (trimmed.includes('Light') || trimmed.includes('Dark'))
  ) {
    const m = SWIFT_CLASS_RE.exec(trimmed);
    Iif (!m) return null;
    return { type: 'class', className: m[1], mode: classNameToMode(m[1]) };
  }
 
  if ((trimmed.includes('static let') || trimmed.includes('static var')) && trimmed.includes('Color(red:')) {
    return parseSwiftDirectColor(trimmed, currentClass, currentMode);
  }
 
  if (
    trimmed.includes('static var') &&
    trimmed.includes(':') &&
    trimmed.includes('{') &&
    trimmed.includes('.')
  ) {
    const refMatch = SWIFT_REF_RE.exec(trimmed);
    Eif (refMatch) return { type: 'ref', tokenName: refMatch[1], refProperty: refMatch[2], mode: currentMode };
  }
 
  return null;
}
 
/**
 * Parse all color tokens from a Swift source file.
 * @param {string} swiftContent
 * @returns {Map<string, string>} token name → hex (e.g. 'color-brand-base-50-light' → 'aabbcc')
 */
export function parseColorsFromSwift(swiftContent) {
  const colors = new Map();
  const directColors = new Map();
  const referenceAssignments = [];
 
  let currentMode = null;
  let currentClass = null;
 
  for (const line of swiftContent.split('\n')) {
    const result = parseSwiftLine(line.trim(), currentClass, currentMode);
    if (!result) continue;
 
    if (result.type === 'class') {
      currentClass = result.className;
      currentMode = result.mode;
      continue;
    }
 
    if (result.type === 'direct') {
      storeDirectToken(
        directColors,
        colors,
        result.fullTokenName,
        result.hex,
        result.mode,
        normalizeSwiftTokenName,
      );
      continue;
    }
 
    Eif (result.type === 'ref') referenceAssignments.push(result);
  }
 
  resolveReferences(referenceAssignments, directColors, colors, normalizeSwiftTokenName);
  return colors;
}