88 lines
3.2 KiB
Markdown
88 lines
3.2 KiB
Markdown
# php2go
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Convert PHP source code to Go by AST walking.
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The goal is to produce idiomatic, maintainable Go code as part of a one-off conversion. This is not generally possible for highly dynamic PHP code, that may require manual fixups.
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## Progress
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[X] Convert some small programs
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[X] Error handling
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- [X] All functions return `(type, error)`
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- [X] Convert `throw` to err return
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- [ ] Elide error return for functions that cannot throw
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- ?? Could be a standalone Go refactoring tool
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- [ ] Non-leaf function calls need to check + bubble errors
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- [ ] Behaviour of function calls in rvalue cases where err cannot be checked
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[ ] Comprehensive coverage of all AST node types
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- [ ] Node
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- [ ] Stmt
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- [ ] Expr
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- [X] Binary
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- [ ] Scalar
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[X] Array handling
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- [X] Infer whether to use slice/map for PHP array
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- [ ] Infer whether map use should be order-preserving
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[ ] Multi-file programs
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- [ ] Include/Require
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[ ] Namespaces
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[ ] Generators
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[ ] Numbered break/continue
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[ ] Goto
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[ ] Comma operator
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[ ] `isset`/`unset`
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[ ] `instanceof`
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[ ] `try`/`catch`/`finally`
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[ ] Abandon upon sight of `eval` / `extract` / ...
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[ ] Assignment expressions
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- Go doesn't support assignment in rvalues, only as a statement
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- When walking below stmt level, need to first fully walk and check for any function calls + assignments that may need hoisting (and we can probably only do that correctly if there is no short-circuiting)
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- [X] Add subtree walk + catch error for this case
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- [ ] Add hoisting pass
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[ ] Closures
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- [ ] Handle value/reference captures
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[ ] Sort callbacks
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- [ ] Transparent conversion to sort.Slice
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[X] Convert top-level calls to `init()`/`main()`
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- *Currently always `init`*
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[ ] Class/object transformations
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- [X] Convert `new X` constructor calls to `NewX`
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- [X] Visibility
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- [ ] Call mangled function name at call sites
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- *PHP variable names are case-sensitive, function names are case-insensitive*
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- [X] Static methods
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- [X] Inheritance *partial*
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- [X] Interfaces
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- [X] super
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- [X] Need to track current conversion state through into function generator, to select the concrete parent
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- [X] parent::
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- [X] self::
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- [ ] static::
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- [ ] Traits / `use`
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- [ ] Abstract methods
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[ ] Type inference
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- [ ] Convert known PHP typenames to Go equivalents
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- [ ] Parse extra types from phpdoc blocks
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[ ] Infer whether to declare variable (`var` / `:=`) or reuse (`=`)
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- [ ] Track current visibility scope
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[ ] Library/environment transformations
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- [ ] Standard library transformations
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- [ ] Track golang package imports
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- [ ] Handle conflicts between golang stdlib packages / local variable names
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- [ ] PHP Superglobal transformations
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- [ ] `$_SERVER['argv']` to os.Args
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- [ ] `$_GET['name']` to r.FormValue('name')
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- [ ] Common 3rd party package transformations to popular equivalents (optional)
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- [ ] Guzzle
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- [ ] AWS SDK
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- [ ] PHPUnit -> Go Test
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- [ ] Replace Composer/PSR-4 autoloading with Go imports
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[X] Variadic function parameters
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[X] Preserve comments
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[ ] Preserve rough line spacing
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[ ] Convert wordpress / mediawiki / symfony
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- [ ] Option to convert with preset=cli, preset=web, webroot path
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- [ ] Option to generate built-in web server
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[ ] Generate source maps
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[ ] Command-line tool option to `go run`
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