Paul Berry
599f4bf94e
These extensions were previously in `pkg/analyzer_utilities`, which is not published on `pub`. That meant they could not be used from within the `lib` directory of any package that *is* published on `pub`. Specifically, they could not be used from within `pkg/analyzer_testing/lib`. In a follow-up CL, I will modify the testing logic so that after printing `To accept the current state, expect:`, it prints diagnostic codes in their proper camelCase format. Change-Id: I6a6a696432d7162906b2c235ea88310dc0aa1fa9 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/480040 Commit-Queue: Paul Berry <paulberry@google.com> Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
95 lines
2.8 KiB
Dart
95 lines
2.8 KiB
Dart
// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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extension StringExtension on String {
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static final _toSnakeCaseRegExp = RegExp('_?[A-Z]');
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static final _startsWithLowerCaseRegExp = RegExp('^[a-z]');
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static final _startsWithUpperCaseRegExp = RegExp('^[A-Z]');
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/// Returns `true` if the string is a `camelCase` string.
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bool get isCamelCase {
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if (contains('_')) return false;
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if (_startsWithLowerCaseRegExp.matchAsPrefix(this) == null) return false;
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return true;
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}
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/// Returns `true` if the string is a `PascalCase` string.
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bool get isPascalCase {
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if (contains('_')) return false;
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if (_startsWithUpperCaseRegExp.matchAsPrefix(this) == null) return false;
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return true;
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}
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/// Converts `SCREAMING_SNAKE_CASE` or `snake_case` to `camelCase`.
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String toCamelCase() {
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var parts = toLowerCase().split('_');
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var buffer = StringBuffer();
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var i = 0;
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// Preserve initial '_'s
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while (i < parts.length - 1 && parts[i].isEmpty) {
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buffer.write('_');
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++i;
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}
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if (i < parts.length) {
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// Convert first word to lower case
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buffer.write(parts[i].toLowerCase());
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++i;
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// Convert remaining words to initial upper case
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while (i < parts.length) {
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var part = parts[i];
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if (part.isNotEmpty) {
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buffer.write(part[0].toUpperCase());
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buffer.write(part.substring(1));
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}
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++i;
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}
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}
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return buffer.toString();
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}
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/// Converts `SCREAMING_SNAKE_CASE` or `snake_case` to `PascalCase`.
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String toPascalCase() {
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var parts = toLowerCase().split('_');
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var buffer = StringBuffer();
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var i = 0;
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// Preserve initial '_'s
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while (i < parts.length - 1 && parts[i].isEmpty) {
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buffer.write('_');
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++i;
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}
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// Convert words to initial upper case
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while (i < parts.length) {
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var part = parts[i];
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if (part.isNotEmpty) {
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buffer.write(part[0].toUpperCase());
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buffer.write(part.substring(1));
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}
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++i;
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}
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return buffer.toString();
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}
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/// Converts `camelCase` or `PascalCase` to `snake_case`
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String toSnakeCase() {
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var parts = <String>[];
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var i = 0;
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var wordStarts = _toSnakeCaseRegExp.allMatches(this);
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for (var RegExpMatch(:start) in wordStarts) {
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if (i < start) {
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parts.add(substring(i, start).toLowerCase());
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i = start;
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}
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if (this[i] == '_' && parts.isNotEmpty) {
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// Avoid doubling up the `_`. This handles strings that are already in
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// snake case like `foo_Bar` (which translates to `foo_bar`).
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i++;
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}
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}
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if (i < length) {
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parts.add(substring(i).toLowerCase());
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}
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return parts.join('_');
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}
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}
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