69 lines
1.7 KiB
Markdown
69 lines
1.7 KiB
Markdown
# Belatuk Code Buffer
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[](https://dart.dev/null-safety)
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[](https://github.com/dart-backend/belatuk-common-utilities/blob/main/packages/code_buffer/LICENSE)
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**Replacement of `package:code_buffer` with breaking changes to support NNBD.**
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An advanced StringBuffer geared toward generating code, and source maps.
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## Installation
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In your `pubspec.yaml`:
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```yaml
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dependencies:
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belatuk_code_buffer: ^5.0.0
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```
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## Usage
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Use a `CodeBuffer` just like any regular `StringBuffer`:
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```dart
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String someFunc() {
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var buf = CodeBuffer();
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buf
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..write('hello ')
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..writeln('world!');
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return buf.toString();
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}
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```
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However, a `CodeBuffer` supports indentation.
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```dart
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void someOtherFunc() {
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var buf = CodeBuffer();
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// Custom options...
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var buf = CodeBuffer(newline: '\r\n', space: '\t', trailingNewline: true);
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// Any following lines will have an incremented indentation level...
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buf.indent();
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// And vice-versa:
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buf.outdent();
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}
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```
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`CodeBuffer` instances keep track of every `SourceSpan` they create.
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This makes them useful for codegen tools, or to-JS compilers.
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```dart
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void someFunc(CodeBuffer buf) {
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buf.write('hello');
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expect(buf.lastLine.text, 'hello');
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buf.writeln('world');
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expect(buf.lastLine.lastSpan.start.column, 5);
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}
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```
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You can copy a `CodeBuffer` into another, heeding indentation rules:
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```dart
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void yetAnotherFunc(CodeBuffer a, CodeBuffer b) {
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b.copyInto(a);
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}
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```
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