7c15a26eab
This attempts to reland https://github.com/flutter/flutter/pull/126848 This was reverted because it made some unexpected changes to our perf measurements. After landing https://github.com/flutter/flutter/pull/127900, we have much less noise in our benchmarks, so I'd like to reland this and see if there is still a significant measurement difference.
Token Defaults Generator
Script that generates widget component theme data defaults based on the Material Token database. These tokens were extracted into a JSON file from an internal Google database.
Usage
Run this program from the root of the git repository:
dart dev/tools/gen_defaults/bin/gen_defaults.dart
Templates
There is a template file for every component that needs defaults from
the token database. These templates are implemented as subclasses of
TokenTemplate. This base class provides some utilities and a structure
for adding a new block of generated code to the bottom of a given file.
Templates need to override the generate method to provide the generated
code block as a string. The tokens are represented as a Map<String, dynamic>
that is loaded from data/material-tokens.json. Templates can look up
whatever properties are needed in this structure to provide the properties
needed for the component.
See lib/fab_template.dart for an example that generates defaults for the
Floating Action Button.