Task: Add extensions for string nullable and nonull functions and text export for text formatter

lib/src/text/extension.dart

@@ -0,0 +1,35 @@
+import 'functions.dart';
+
+extension StringExtensionOnNonull on String {
+  String? get capitalized {
+    return (isNotEmpty) ? '${this[0].toUpperCase()}${substring(1)}' : this;
+  }
+}
+
+extension StringExtensionOnNullable on String? {
+  String? textFormat(List<dynamic> args) => StringUtils.textFormat(this, args);
+
+  String? decorator(Map<String, dynamic> params) =>
+      StringUtils.decorator(this, params);
+
+  bool get isBlank {
+    if (this == null) return true;
+    return this!.trim().isEmpty;
+  }
+
+  bool get isNotBlank {
+    return !isBlank;
+  }
+
+  bool get isNullOrEmpty {
+    return StringUtils.isNullOrEmpty(this);
+  }
+
+  bool get isNotNullOrEmpty {
+    return !isNullOrEmpty;
+  }
+
+  bool get isNullOrEmptyOrBlank => StringUtils.isNullOrEmptyOrBlank(this);
+
+  bool get isEqualsIgnoreCase => StringUtils.equalsIgnoreCase(this, this);
+}

lib/src/text/functions.dart

@@ -0,0 +1,49 @@
+import 'text_formatter.dart';
+
+class StringUtils {
+  /// Format number with precision
+  static String format(double n, [int precision = 2]) {
+    return n.toStringAsFixed(n.truncateToDouble() == n ? precision : precision);
+  }
+
+  /// Text format with custom args
+  static String? textFormat(String? text, List<dynamic> args) =>
+      TextFormatter(text).format(args);
+
+  /// Text decorator with custom key/value params
+  static String? decorator(String? text, Map<String, dynamic> params) =>
+      TextFormatter(text).decorate(params);
+
+  static String? asLowerCaseThenTrim(String? text) =>
+      text?.toLowerCase().trim();
+  static String? asUpperCaseThenTrim(String? text) =>
+      text?.toUpperCase().trim();
+
+  /// Check string is null or empty text
+  static bool isNullOrEmpty(String? text) {
+    if (text == null) return true;
+    return text.isEmpty;
+  }
+
+  /// Check string is null or empty or blank text
+  static bool isNullOrEmptyOrBlank(String? text) {
+    if (isNullOrEmpty(text)) {
+      return true;
+    }
+    return text!.trim().isEmpty;
+  }
+
+  /// Check string pair is equals or not with ignore-case and trim
+  static bool equalsIgnoreCase(String? a, String? b, {trim = false}) {
+    if (a == b) {
+      return true;
+    }
+
+    if (trim == true) {
+      a = asLowerCaseThenTrim(a);
+      b = asLowerCaseThenTrim(b);
+    }
+
+    return a?.toLowerCase() == b?.toLowerCase();
+  }
+}

lib/text.dart

@@ -1,3 +1,5 @@
 library cubetiq;
 
 export 'src/text/text_formatter.dart';
+export 'src/text/extension.dart';
+export 'src/text/functions.dart';