flutter pub add change_case基于插件公开信息、社区数据与项目使用情况整理的选型参考。
change_case 包通过为 Dart 中的 String 类添加便捷方法，扩展了文本在各种大小写格式之间的转换功能，包括 camelCase、PascalCase、snake_case、param-case 和 CONSTANT_CASE。它简化了应用程序开发中常见的字符串转换任务，例如格式化 API 响应、生成动态标识符或确保代码库中命名约定的一致性。该包轻量且支持所有主要平台，非常适合需要强大文本处理功能的跨平台 Flutter 应用。
以下为关联源码仓库的 README 原文快照，最新内容请访问源码仓库。
Transform a string between
camelCase,PascalCase,Capital Case,snake_case,param-case,CONSTANT_CASEand others.
These functions come with package:change_case
Transform into a string with the separator denoted by the next word capitalized.
'test string'.toCamelCase(); // 'testString'
Transform into a space separated string with each word capitalized.
'test string'.toCapitalCase(); // 'Test String'
Transform into upper case string with an underscore between words.
'test string'.toConstantCase(); // 'TEST_STRING'
Transform into a lower case string with a period between words.
'test string'.toDotCase(); // 'test.string'
Transform into a dash separated string of capitalized words.
'test string'.toHeaderCase(); // 'Test-String'
Transform into a lower cased string with spaces between words.
'testString'.toNoCase(); // 'test string'
Transform into a lower cased string with dashes between words.
'test string'.toParamCase(); // 'test-string'
Transform into a string of capitalized words without separators.
'test string'.toPascalCase(); // 'TestString'
Transform into a lower case string with slashes between words.
'test string'.toPathCase(); // 'test/string'
// provide a separator override default '/'
'test string'.toPathCase(r'\'); // 'test\string'
Transform into a lower case with spaces between words, then capitalize the string.
'testString'.toSentenceCase(); // 'Test string'
Transform into a lower case string with underscores between words.
'test string'.toSnakeCase(); // 'test_string'
Transform a string into title case following English rules.
'a simple test'.toTitleCase(); // 'A Simple Test'
Transform a string by swapping every character from upper to lower case, or lower to upper case.
'Test String'.toSwapCase(); // 'tEST sTRING'
Returns
trueif the string is lower case only.
'test string'.isLowerCase(); // true
Returns
trueif the string is upper case only.
'test string'.isUpperCase(); // false
Transforms the string with the first character in lower cased.
'TEST'.toLowerFirstCase(); // 'tEST'
Transforms the string with the first character in upper cased.
'test'.toUpperFirstCase(); // 'Test'
Transform into a string with random capitalization applied.
'Test String'.toSpongeCase(); // 'tEst stRINg'
package:change_casehas a configuration file,ChangeCaseConfig, that you can use to updatesplitPatterns,stripPatterns, and theplaceholderwhich will be applied to most function listed above.
I don't suggest changing these unless you know what you are doing 😁
Change case uses RegExp to split & replace characters of the string.
While they are great at what they do, you may want to update or add new patterns.
These patterns can be updated by using the ChangeCaseConfig.setUp(splitPatterns: [...], stripPatterns: [...])
The default patterns are:
Note:
(?:•)*is used to match any "•" (placeholder) character.
Split
ChangeCaseConfig.lowerOrNumToUpperPattern
// matches lowercase or numeric char to uppercase char
RegExp('([a-z0-9])(?:•)*([A-Z])')
ChangeCaseConfig.lowerOrNumToUpperPattern
// matches uppercase char to uppercase followed by lowercase char
RegExp('([A-Z])(?:•)*([A-Z][a-z])')
Strip
ChangeCaseConfig.upperToLowerPattern
// matches any non-alphanumeric char
RegExp('[^A-Z0-9]+', caseSensitive: false)
ChangeCaseConfig.lowerToNumOrUpperPattern (Not included in default, but can be used to add or replace)
// matches lowercase char to numeric or uppercase char
// changes the behavior to `word2019 -> word 2019` and `minifyURLs -> minify urls`
RegExp('([a-z])([A-Z0-9])')
can be configured with
ChangeCaseConfig.setUp(placeholder: ...)
The placeholder is a string that is added and used as a reference to configure each case.
The default placeholder is "•"
For example:
final string = 'test stringCase';
print(string.toCamelCase()); // expected: 'testStringCase'
// runs splitPatterns, returns "test string•Case"
// runs stripPatterns, returns "test•string•Case"
// runs camel case logic, returns "testStringCase"
This string needs to be a unique character that is not used in the string.
依赖清单 1 项
>=1.7.0 <2.0.0