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51 lines
2.1 KiB
Markdown
51 lines
2.1 KiB
Markdown
# Things that make developing Psalm complicated
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This is a somewhat informal list that might aid others.
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## Statement analysis
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- **Type inference**
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what effect do different PHP elements (function calls, if/for/foreach statements etc.) have on the types of things
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- **Especially loops**
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loops are hard to reason about - break and continue are a pain
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- **Also dealing with literal strings/ints/floats**
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- **Code liveness detection**
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what effect do different PHP elements have on whether code is in scope, whether code is redundant
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- **Logical assertions**
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what effect do different PHP elements have on user-asserted logic in if conditionals, ternarys etc.
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- **Generics & Templated code**
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Figuring out how templated code should work (`@template` tags), how much it should work like it does in other languages (Hack, TypeScript etc.)
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## Supporting the community
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- **Supporting formal PHPDoc annotations**
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- **Supporting informal PHPDoc annotations**
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e.g. `ArrayIterator|string[]` to denote an `ArrayIterator` over strings
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- **non-Composer projects**
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e.g. WordPress
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## Making Psalm fast
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- **Parser-based reflection**
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requires scanning everything necessary for analysis
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- **Forking processes** (non-windows)
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mostly handled by code borrowed from Phan, but can introduce subtle issues, also requires to think about how to make work happen in processes
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- **Caching things**
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see below
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## Cache invalidation
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- **Invalidating analysis results**
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requires tracking what methods/properties are used in what other files, and invalidating those results when linked methods change
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- **Partial parsing**
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Reparsing bits of files that have changed, which is hard
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## Language Server Support
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- **Making Psalm fast**
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see above
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- **Handling temporary file changes**
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- **Dealing with malformed PHP code**
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When people write code, it's not always pretty as they write it. A language server needs to deal with that bad code somehow
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## Fixing code with Psalter
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- **Adding/replacing code**
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Figuring out what changed, making edits that could have been made by a human
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- **Minimal diffs**
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hard to change more than you need
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