generate method

@override String? generate()

Implementation

@override
String? generate() {
  final hasColorTokens =
      themes.any((theme) => theme.resolvedTokens.any((token) => token.type == 'color'));

  if (!hasColorTokens) return null;

  var output = '';

  output += _genWarning;

  output += "\n\n import 'package:flutter/material.dart'; \n\n";

  final primaryTheme = themes.first;
  output += 'class AppColorsExtension extends ThemeExtension<AppColorsExtension> {\n';
  output += '  const AppColorsExtension({\n';

  // Generate properties
  _processTokens(
    theme: primaryTheme,
    type: 'color',
    callback: (token) => output += '    required this.${token.variableName},\n',
  );

  output += '  });\n\n';

  // Generate properties again for final declaration
  _processTokens(
    theme: primaryTheme,
    type: 'color',
    callback: (token) => output += '  final Color ${token.variableName};\n',
  );

  // Generate copyWith method
  output += '\n  @override\n';
  output += '  ThemeExtension<AppColorsExtension> copyWith({\n';
  _processTokens(
    theme: primaryTheme,
    type: 'color',
    callback: (token) => output += '    Color? ${token.variableName},\n',
  );
  output += '  }) {\n';
  output += '    return AppColorsExtension(\n';
  _processTokens(
    theme: primaryTheme,
    type: 'color',
    callback: (token) => output +=
        '      ${token.variableName}: ${token.variableName} ?? this.${token.variableName},\n',
  );
  output += '    );\n';
  output += '  }\n\n';

  // Generate lerp method
  output += '  @override\n';
  output += '  ThemeExtension<AppColorsExtension> lerp(\n';
  output += '    covariant ThemeExtension<AppColorsExtension>? other,\n';
  output += '    double t,\n';
  output += '  ) {\n';
  output += '    if (other is! AppColorsExtension) {\n';
  output += '      return this;\n';
  output += '    }\n\n';
  output += '    return AppColorsExtension(\n';
  _processTokens(
    theme: primaryTheme,
    type: 'color',
    callback: (token) => output +=
        '      ${token.variableName}: Color.lerp(${token.variableName}, other.${token.variableName}, t)!,\n',
  );
  output += '    );\n';
  output += '  }\n';

  output += '}\n\n';

  final colorTransformer = ColorTransformer();

  // Generate AppColorsExtension instances for primary and secondary themes
  output += 'const primaryAppColors = AppColorsExtension(\n';
  _processTokens(
    theme: primaryTheme,
    type: 'color',
    callback: (token) {
      final colorDeclaration = colorTransformer.transform(token);
      output += '  ${token.variableName}: $colorDeclaration, \n';
    },
  );

  output += ');\n\n';

  if (themes.elementAtOrNull(1) != null) {
    output += 'const secondaryAppColors = AppColorsExtension(\n';
    _processTokens(
      theme: themes[1],
      type: 'color',
      callback: (token) {
        final colorDeclaration = colorTransformer.transform(token);
        output += '  ${token.variableName}: $colorDeclaration, \n';
      },
    );
    output += ');\n';
  }

  return output;
}