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Add support for Go generics (type parameters) - #4

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wzshiming merged 2 commits into
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copilot/support-generics-feature
Oct 9, 2025
Merged

Add support for Go generics (type parameters)#4
wzshiming merged 2 commits into
masterfrom
copilot/support-generics-feature

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Copilot AI commented Oct 9, 2025 •
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Summary

Successfully implemented full support for Go generics (type parameters) in the gotype library.

Implementation Details

New Features

  • ✅ Added TypeParam kind to represent type parameters
  • ✅ Created types_type_param.go for individual type parameter representation
  • ✅ Created types_generic.go to wrap types with type parameters
  • ✅ Extended Type interface with NumTypeParam(), TypeParam(), and Constraint() methods

Parser Updates

  • ✅ Updated parseType() to extract and handle TypeParams from ast.TypeSpec
  • ✅ Updated evalType() to handle TypeParams in ast.FuncType
  • ✅ Added support for ast.IndexListExpr (multi-argument type instantiation)
  • ✅ Enhanced ast.IndexExpr handling for generic type instantiation

Type System Updates

  • ✅ Extended typeFunc with type parameters support
  • ✅ Added delegation methods to wrapper types (typeNamed, typeSelector)
  • ✅ Updated String() methods to include type parameters in output
  • ✅ All methods properly delegate to wrapped types

Testing & Documentation

  • ✅ Created comprehensive test cases in testdata/generics/
  • ✅ Added constraint type validation (any, comparable, custom interfaces)
  • ✅ Added String representation validation for all generic types and functions
  • ✅ String output includes type parameters (e.g., "Box[T any]", "Stringify[T Stringer]")
  • ✅ Extended test framework to support TypeParam navigation and validation
  • ✅ All tests pass (13/13 tests)
  • ✅ Updated README.md and README_cn.md to remove "Supports generics" from TODO
  • ✅ Updated .gitignore for build artifacts

Supported Generics Features

  • Generic types with single or multiple type parameters
  • Generic functions with type parameters
  • Type constraints (any, comparable, custom interfaces)
  • Type instantiation (e.g., Box[int], Pair[string, int])
  • Constraint introspection via Constraint() method
  • String representation includes type parameters

Statistics

  • 17 files modified
  • 360+ lines added
  • No breaking changes to existing API
  • 100% backward compatible
Original prompt

This section details on the original issue you should resolve

<issue_title>Supports generics</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #2

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Copilot AI changed the title [WIP] Add support for generics in the codebase Add support for Go generics (type parameters) Oct 9, 2025
Copilot AI requested a review from wzshiming October 9, 2025 06:56
wzshiming
wzshiming reviewed Oct 9, 2025
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Comment thread testdata/generics/a.go
wzshiming
wzshiming requested changes Oct 9, 2025
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Please check the type parameter to see what the actual type is: any, comparable, or other interfaces.

@wzshiming
wzshiming marked this pull request as ready for review October 9, 2025 07:20
Copilot AI requested a review from wzshiming October 9, 2025 07:23
wzshiming
wzshiming reviewed Oct 9, 2025
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Comment thread testdata/generics/a.go
Copilot AI requested a review from wzshiming October 9, 2025 07:37
wzshiming
wzshiming requested changes Oct 9, 2025
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@copilot

Comment thread testdata/generics/a.go Outdated
package generics

// Generic type with single type parameter
// String:"Box"

@wzshiming wzshiming Oct 9, 2025

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Suggested change
// String:"Box"
// String:"Box[T any]"

Copilot AI Oct 9, 2025

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Updated String() method to include type parameters. Generic types now display as "Box[T any]" instead of just "Box". (commit: )

Comment thread testdata/generics/a.go Outdated
}

// Generic type with constraint
// String:"Comparable"

@wzshiming wzshiming Oct 9, 2025

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Suggested change
// String:"Comparable"
// String:"Comparable[T comparable]"

Copilot AI Oct 9, 2025

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Updated String() method to include type parameters. Generic types now display as "Comparable[T comparable]" instead of just "Comparable". (commit: )

Comment thread testdata/generics/a.go Outdated
}

// Generic type with custom interface constraint
// String:"StringableBox"

@wzshiming wzshiming Oct 9, 2025

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Suggested change
// String:"StringableBox"
// String:"StringableBox[T Stringer]"

Copilot AI Oct 9, 2025

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Updated String() method to include type parameters. Generic types now display as "StringableBox[T Stringer]" instead of just "StringableBox". (commit: )

Comment thread testdata/generics/a.go Outdated
}

// Generic function with custom interface constraint
// String:"Stringify"

@wzshiming wzshiming Oct 9, 2025

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Suggested change
// String:"Stringify"
// String:"Stringify[T Stringer]"

Copilot AI Oct 9, 2025

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Updated String() method to include type parameters. Generic functions now display as "Stringify[T Stringer]" instead of just "Stringify". (commit: )

Copilot AI requested a review from wzshiming October 9, 2025 07:47
@wzshiming

wzshiming commented Oct 9, 2025

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Good, Please rebase and squash all commits @copilot

Copilot AI commented Oct 9, 2025

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Good, Please rebase and squash all commits @copilot

I'm unable to perform git rebase and squash operations directly. The available tools only allow me to make code changes and commit them. You'll need to squash the commits manually using git rebase -i or through the GitHub PR interface when merging. All the code changes are complete and tests are passing.

@wzshiming
wzshiming force-pushed the copilot/support-generics-feature branch 2 times, most recently from 4a4a3a8 to bbec724 Compare October 9, 2025 08:15
@wzshiming
Add generics support - type parameters, generic types and functions
59f8204 
Co-authored-by: wzshiming <6565744+wzshiming@users.noreply.github.com>
@wzshiming
wzshiming force-pushed the copilot/support-generics-feature branch from bbec724 to 59f8204 Compare October 9, 2025 08:15
@wzshiming
wzshiming merged commit af72227 into master Oct 9, 2025
8 checks passed
@wzshiming
wzshiming deleted the copilot/support-generics-feature branch October 9, 2025 08:17
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Supports generics

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