feat(golang): Go AST helper functions and parser scaffold (PR-02)

[shivasurya]

Summary

• Create graph/golang/ package with 8 shared utility functions
• Add GoParams struct for parameter extraction across all declaration parsers
• Add setGoSourceLocation helper in parser_golang.go for consistent byte-range tracking
• Add empty parser_golang.go dispatcher shell

Test plan

• ExtractParameters handles grouped params: a, b int correctly
• ExtractParameters handles variadic params: args ...string correctly
• ExtractParameters handles unnamed params: func(int, string) correctly
• ExtractReturnType handles single, multi, named, and empty returns
• ExtractReceiverType strips pointer from *Server → "Server"
• ExtractReceiverType gracefully returns "" for generic receivers (*Stack[T])
• ExtractStructFields extracts named fields + embedded types
• ExtractInterfaceMethods extracts methods + embedded interfaces (type_elem)
• DetermineVisibility distinguishes exported vs unexported names
• IsInitFunction("init") → true; IsInitFunction("main") → false
• IsGoKeyword covers all 25 keywords + predeclared types + 18 builtins + any/comparable
• setGoSourceLocation sets File/StartByte/EndByte on nodes
• go build ./... compiles without errors
• go test ./graph/golang/... passes all tests (94.1% coverage; remaining 5.9% is defensive guards unreachable by tree-sitter)
• go vet ./... reports zero findings
• No regressions in existing Python/Java test suites

🤖 Generated with Claude Code

[safedep]

SafeDep Report Summary

No dependency changes detected. Nothing to scan.

_{This report is generated by SafeDep Github App}

[codecov]

Codecov Report

❌ Patch coverage is 87.17949% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.82%. Comparing base (46c3910) to head (b072f16).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sast-engine/graph/golang/helpers.go	91.07%	5 Missing and 5 partials ⚠️
sast-engine/graph/parser_golang.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #521      +/-   ##
==========================================
+ Coverage   82.78%   82.82%   +0.03%     
==========================================
  Files         122      124       +2     
  Lines       14345    14462     +117     
==========================================
+ Hits        11876    11978     +102     
- Misses       2021     2031      +10     
- Partials      448      453       +5     

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[shivasurya]

• feat(mcp): Add foundational Go language support to MCP server #530
• feat(golang): Add Go security rules and rule manifest #529
• feat(golang): Scan & CI pipeline routing (PR-09) #528
• feat(golang): Implement Go call graph construction (PR-08) #527
• feat(golang): Go module registry and import resolution (PR-07) #526
• feat(golang): Implement calls, closures, and control flow statements (PR-06 complete) #525
• feat(golang): Go variable, constant, and assignment parsing (PR-05) #524
• feat(golang): Go type definitions parsing (PR-04) #523
• feat(golang): Go function and method declaration parsing (PR-03) #522
• feat(golang): Go AST helper functions and parser scaffold (PR-02) #521 👈 (View in Graphite)
• feat(golang): Go file detection and tree-sitter-go parsing (PR-01) #520
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[shivasurya]

Merge activity

• Feb 15, 4:00 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Feb 15, 4:01 AM UTC: Graphite rebased this pull request as part of a merge.
• Feb 15, 4:02 AM UTC: @shivasurya merged this pull request with Graphite.

[github-actions]

Code Pathfinder Security Scan

No security issues detected.

Metric	Value
Files Scanned	3
Rules	38

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_{Powered by Code Pathfinder}