feat: add printer package for AST to source code conversion #107
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Add a new printer package that converts MoonBit AST back to source code. Features: - Support all top-level declarations (functions, structs, enums, traits, impl, type aliases, etc.) - Support all expression types with proper operator precedence - Support patterns, types, and constants - Tab-based indentation for nested structures - Round-trip test suite to verify parse → print → parse consistency Files: - printer/printer.mbt: Top-level declarations and main entry points - printer/expr.mbt: Expression printing with indentation support - printer/pattern.mbt: Pattern printing - printer/type.mbt: Type printing - printer/constant.mbt: Constant literal printing - printer/printer_test.mbt: Unit tests and round-trip tests Co-Authored-By: Claude Opus 4.5 <[email protected]>
Co-Authored-By: Claude Opus 4.5 <[email protected]>
Add print_code(parsed) that takes parse_string result directly and returns None if there are parse errors. Co-Authored-By: Claude Opus 4.5 <[email protected]>
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Thank you for your interest! There are some source printers in the community, such as illusory0x0/printer. There is also a pretty-printer, moonbitlang/formatter (though it is unfinished). You can consider contributing to illusory0x0/printer or maintaining it as a separate package. |
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Summary
Add a new
printerpackage that converts MoonBit AST back to source code.Motivation
Currently, there's no public API to pretty-print AST back to source code. I'm working on an AST transformer and needed this functionality.
I believe
parserandprintershould be maintained together as a pair - when the AST structure changes, both need to be updated accordingly. Having the printer in this repository ensures they stay in sync.If this PR is not suitable for this repository, I will maintain it as a separate package.
Features
parse → print → parse → printconsistencyTest Plan
🤖 Generated with Claude Code