setShorthandGrid static method

Implementation

static void setShorthandGrid(Map<String, String?> properties, String shorthandValue) {
  String value = shorthandValue.trim();
  if (value.isEmpty) return;

  final String lower = value.toLowerCase();

  // `grid: none` resets the template and auto tracks to their initial values.
  if (lower == 'none') {
    properties[GRID_TEMPLATE_ROWS] = 'none';
    properties[GRID_TEMPLATE_COLUMNS] = 'none';
    properties[GRID_TEMPLATE_AREAS] = 'none';
    properties[GRID_AUTO_ROWS] = 'auto';
    properties[GRID_AUTO_COLUMNS] = 'auto';
    properties[GRID_AUTO_FLOW] = 'row';
    return;
  }

  // Ignore area-string based syntaxes (e.g. `"a a" "b c" / 1fr 1fr"`) for now.
  // These are covered by explicit longhands (`grid-template-areas`, etc.).
  if (value.contains('"') || value.contains('\'')) {
    return;
  }

  final List<String> parts = value.split(_slashRegExp);
  if (parts.length == 2) {
    final String before = parts[0].trim();
    final String after = parts[1].trim();
    if (before.isEmpty && after.isEmpty) return;

    final List<String> beforeTokens = _splitBySpace(before);
    final List<String> afterTokens = _splitBySpace(after);

    final bool beforeStartsAutoFlow = beforeTokens.isNotEmpty && beforeTokens[0] == 'auto-flow';
    final bool afterStartsAutoFlow = afterTokens.isNotEmpty && afterTokens[0] == 'auto-flow';

    // Form 1: grid: auto-flow <rows>? / <template-columns>
    if (beforeStartsAutoFlow && !afterStartsAutoFlow) {
      final bool dense = beforeTokens.contains('dense');
      String autoFlow = 'row';
      if (dense) autoFlow = 'row dense';
      properties[GRID_AUTO_FLOW] = autoFlow;

      // First non-keyword token becomes grid-auto-rows, if present.
      for (final String token in beforeTokens) {
        if (token == 'auto-flow' || token == 'dense') continue;
        properties[GRID_AUTO_ROWS] = token;
        break;
      }

      if (after.isNotEmpty) {
        properties[GRID_TEMPLATE_COLUMNS] = after;
      }
      properties[GRID_TEMPLATE_ROWS] = 'none';
      properties[GRID_TEMPLATE_AREAS] = 'none';
      return;
    }

    // Form 2: grid: <template-rows> / auto-flow <columns>?
    if (!beforeStartsAutoFlow && afterStartsAutoFlow) {
      if (before.isNotEmpty) {
        properties[GRID_TEMPLATE_ROWS] = before;
      }

      final bool dense = afterTokens.contains('dense');
      String autoFlow = 'column';
      if (dense) autoFlow = 'column dense';
      properties[GRID_AUTO_FLOW] = autoFlow;

      // First non-keyword token becomes grid-auto-columns, if present.
      for (final String token in afterTokens) {
        if (token == 'auto-flow' || token == 'dense') continue;
        properties[GRID_AUTO_COLUMNS] = token;
        break;
      }

      properties[GRID_TEMPLATE_COLUMNS] = 'none';
      properties[GRID_TEMPLATE_AREAS] = 'none';
      return;
    }

    // Basic template rows/columns form: grid: <rows> / <columns>
    if (before.isNotEmpty) {
      properties[GRID_TEMPLATE_ROWS] = before;
    }
    if (after.isNotEmpty) {
      properties[GRID_TEMPLATE_COLUMNS] = after;
    }
  }
}